Injection mold

Abstract

The invention provides an injection mold which comprises a first module and a second module, the first module comprises a first mold core, a first forming groove and a first exhaust groove are formed in one side of the first mold core, the first exhaust groove and the first forming groove are distributed at intervals, and the first exhaust groove is formed in one side of the first forming groove; the second module comprises a second mold core, a second forming groove and a second exhaust groove are formed in the side, close to the first mold core, of the second mold core, the second exhaust groove and the second forming groove are distributed at intervals, and the second exhaust groove is formed in one side of the second forming groove; and the first blocking pieces are arranged on the side, close to the second mold core, of the first mold core, the number of the first blocking pieces is two, and the two first blocking pieces are arranged at the two ends of the first forming groove correspondingly. During injection molding, the first blocking piece blocks and prevents a sizing material from flowing to other areas, except the to-be-coated area, of the terminal and prevents the sizing material from covering the other areas, except the to-be-coated area, of the terminal; and moreover, the burrs are only formed on one side of the to-be-coated area of the terminal, so that subsequent removal is facilitated, and the encapsulation quality of the terminal is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding, and particularly to an injection mold. Background Art

[0002] An injection mold generally consists of a moving mold and a fixed mold. The moving mold is installed on the moving template of an injection molding machine, and the fixed mold is installed on the fixed template of the injection molding machine. During injection molding, the moving mold and the fixed mold are closed to form a gating system and a cavity. When the mold is opened, the moving mold and the fixed mold are separated to take out the overmolded product.

[0003] In the related art, during the injection molding process of overmolding a tubular terminal, after the rubber material flows into the molding cavity, a part of the rubber material will flow along the axial direction of the tubular terminal, resulting in the rubber material covering the non-coated area of the terminal; another part will flow radially in the coated area of the terminal, and burrs will be formed around the coated area of the terminal, and the burrs are irregularly distributed and are not easy to remove, resulting in poor overmolding quality of the terminal. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an injection mold, aiming to solve the problem of poor overmolding quality of the terminal in the related art.

[0005] To solve the above technical problem, the present invention provides an injection mold for molding an overmolded injection product on a to-be-coated area of a tubular terminal, and the injection mold includes:

[0006] A first module, including a first mold core with a first molding groove and a first exhaust groove on one side, the first exhaust groove and the first molding groove are spaced apart, and the first exhaust groove is arranged on one side of the first molding groove;

[0007] A second module, including a second mold core slidably assembled on the side of the first mold core where the first molding groove is located. A second molding groove and a second exhaust groove are arranged on the side of the second mold core close to the first mold core. The second exhaust groove and the second molding groove are spaced apart, and the second exhaust groove is arranged on one side of the second molding groove; and,

[0008] A first blocking member, arranged on the side of the first mold core close to the second mold core. There are two first blocking members, and the two first blocking members are respectively arranged at both ends of the first molding groove;

[0009] Among them, when the molds are closed, the first mold core is attached to the second mold core. The first molding groove and the second molding groove are sealed to form a molding cavity, and the first exhaust groove and the second exhaust groove are sealed to form an exhaust cavity. The area of the terminal to be coated is located in the molding cavity. The first blocking member is sleeved on the outside of the terminal, and the two first blocking members are respectively arranged at both ends of the molding cavity. During injection molding, a gap communicating the molding cavity and the exhaust cavity is formed between the second mold core and the second mold core.

[0010] Optionally, a glue injection channel communicating with the second molding groove is further provided on one side of the second mold core close to the first mold core, and the glue injection channel is arranged on one side of the second molding groove away from the second exhaust groove.

[0011] Optionally, the thickness of the gap ranges from 0.002 mm to 0.04 mm.

[0012] Optionally, the first blocking member includes:

[0013] A connecting portion arranged on one side of the first mold core close to the second mold core; and,

[0014] A first blocking portion connected to one end of the connecting portion away from the first mold core, and the first blocking portion is in an arc shape adapted to the terminal.

[0015] Optionally, an installation hole is provided on one side of the first mold core close to the second mold core, the connecting portion is assembled in the installation hole, and in the direction from the first mold core towards the second mold core, the diameter of the connecting portion gradually decreases.

[0016] Optionally, a first notch is provided on one side of the terminal close to the first mold core, the first notch is located in the area to be coated, a second notch is provided on one side of the terminal close to the second mold core, and both the first notch and the second notch communicate with the inner cavity of the terminal;

[0017] The injection mold further includes a second blocking member arranged on one side of the second mold core close to the first mold core. There are two second blocking members, and the two second blocking members are respectively arranged at both ends of the second molding groove, and the second blocking member passes through the second notch and abuts against the inner wall of the terminal;

[0018] Among them, the two second blocking members seal the inner cavity of the terminal in the area to be coated.

[0019] Optionally, both the first blocking member and the second blocking member are flexible.

[0020] Optionally, the first module further includes a top plate and a liquid inlet plate. The liquid inlet plate is disposed on a side of the top plate close to the second mold core. The liquid inlet plate is connected to the first mold core. The liquid inlet plate is provided with a first accommodation groove, and the top plate is provided with an accommodation cavity communicating with the first accommodation groove.

[0021] The injection mold further includes a runner plate, a cold nozzle, and a glue injection plate. A second accommodation groove is provided on one side of the runner plate. The runner plate is received in the first accommodation groove and is detachably connected to the liquid inlet plate. One end of the cold nozzle is received in the second accommodation groove, and the cold nozzle is slidably assembled on the liquid inlet plate. The glue injection plate is detachably connected to a side of the runner plate away from the cold nozzle, and the glue injection plate is received in the accommodation cavity.

[0022] Optionally, the cold nozzle includes:

[0023] a jacket for slidably assembling on the liquid inlet plate; and,

[0024] a core slidably assembled in the jacket. A cooling channel is formed by enclosing the core and the jacket. One end of the core is disposed outside the jacket and is received in the second accommodation groove.

[0025] Optionally, the injection mold further includes:

[0026] a first heating element disposed on the first module, and the first heating element is disposed on a side of the first mold core away from the second mold core; and,

[0027] a second heating element disposed on the second module, and the second heating element is disposed on a side of the second mold core away from the first mold core.

[0028] Compared with the related art, an injection mold in the present invention has the beneficial effects that: since the first blocking member is sleeved outside the terminal, and the two first blocking members are respectively disposed at both ends of the molding cavity, when injecting, the rubber material in the molding cavity will be blocked by the first blocking member when flowing axially, thereby preventing the rubber material from flowing out of the molding cavity, and further preventing the rubber material from flowing to other areas of the terminal except the area to be coated, and preventing the rubber material from covering other areas of the terminal except the area to be coated; moreover, when the rubber material in the molding cavity flows radially, it can flow into the exhaust cavity through the gap, and the exhaust cavity is only disposed on one side of the molding cavity, so that the flash is only formed on one side of the area to be coated of the terminal, which is convenient for subsequent removal, thereby ensuring the rubber coating quality of the terminal. Description of the Drawings

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or in the related art, the following will briefly introduce the drawings required for use in the description of the embodiments or the related art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0030] Figure 1 is a schematic structural diagram of an injection mold provided by an embodiment of the present invention;

[0031] Figure 2 is a cross-sectional view of an injection mold provided by an embodiment of the present invention;

[0032] Figure 3 is Figure 2 an enlarged view of detail A in;

[0033] Figure 4 is a cross-sectional view when the first mold core and the second mold core are injection-molded according to an embodiment of the present invention;

[0034] Figure 5 is Figure 4 an enlarged view of detail B in;

[0035] Figure 6 is a schematic structural diagram of a second mold body provided by an embodiment of the present invention;

[0036] Figure 7 is a schematic structural diagram of a first mold body provided by an embodiment of the present invention;

[0037] Figure 8 is a schematic structural diagram of a first blocking member provided by an embodiment of the present invention;

[0038] Figure 9 is a schematic structural diagram of a second blocking member provided by an embodiment of the present invention;

[0039] Figure 10 is an assembly schematic diagram of a glue injection plate, a runner plate, and a cold nozzle provided by an embodiment of the present invention;

[0040] Figure 11 is a schematic structural diagram of a runner plate provided by an embodiment of the present invention;

[0041] Figure 12 is a schematic structural diagram of a cold nozzle provided by an embodiment of the present invention;

[0042] Figure 13 is a cross-sectional view of a cold nozzle provided by an embodiment of the present invention;

[0043] Figure 14 is a schematic structural diagram of a terminal provided by an embodiment of the present invention.

[0044] In the accompanying drawings, each reference numeral represents: 1. First module; 11. First mold core; 111. First forming groove; 112. First exhaust groove; 113. Mounting hole; 12. Top plate; 13. Liquid inlet plate; 14. First mold base; 2. Second module; 21. Second mold core; 211. Second forming groove; 212. Second exhaust groove; 213. Glue injection channel; 214. Protrusion; 22. Second mold base; 3. First blocking member; 31. Connection portion; 32. First blocking portion; 321. Conical surface; 4. Second blocking member; 41. Second blocking portion; 42. Contact portion; 5. Runner plate; 51. Second receiving groove; 52. Glue passing groove; 53. Glue passing channel; 6. Nozzle; 61. Outer sleeve; 611. Liquid inlet; 612. Liquid outlet; 62. Inner core; 621. First step; 6211. Third positioning groove; 622. Sprue; 623. Second step; 63. Cooling channel; 64. Third step; 641. First positioning groove; 642. Second positioning groove; 65. Heat insulation sleeve; 7. Glue injection plate; 8. First heating element; 9. Second heating element; 10. First locking member; 20. Second locking member; 30. Third locking member; 40. First sealing member; 50. Second sealing member; 60. Vacuum monitor; 70. Terminal; 701. First notch; 702. Second notch; 703. Area to be coated; 80. Injection molded product. Detailed Description of the Invention

[0045] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0047] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0048] Embodiment:

[0049] Please refer to Figures 1 to 14 , an embodiment of the present invention provides an injection mold for forming a coated injection product 80 on a coated area 703 of a tubular terminal 70. The injection mold includes a first module 1, a second module 2, and a first blocking member 3. The first module 1 includes a first mold core 11 having a first forming groove 111 and a first exhaust groove 112 on one side. The first exhaust groove 112 and the first forming groove 111 are spaced apart, and the first exhaust groove 112 is provided on one side of the first forming groove 111. The second module 2 includes a second mold core 21 slidably assembled on the side of the first mold core 11 where the first forming groove 111 is located. The side of the second mold core 21 close to the first mold core 11 is provided with a second forming groove 211 and a second exhaust groove 212. The second exhaust groove 212 and the second forming groove 211 are spaced apart, and the second exhaust groove 212 is provided on one side of the second forming groove 211. The first blocking member 3 is disposed on the side of the first mold core 11 close to the second mold core 21. There are two first blocking members 3, and the two first blocking members 3 are respectively disposed at both ends of the first forming groove 111. Wherein, when the mold is closed, the first mold core 11 is in contact with the second mold core 21, and the first forming groove 111 and the second forming groove 211 are sealed to form a forming cavity. The first exhaust groove 112 and the second exhaust groove 212 are sealed to form an exhaust cavity. The coated area 703 of the terminal 70 is located in the forming cavity. The first blocking member 3 is sleeved on the outside of the terminal 70, and the two first blocking members 3 are respectively disposed at both ends of the forming cavity. During injection molding, a gap communicating the forming cavity and the exhaust cavity is formed between the second mold core 21 and the second mold core 21.

[0050] Since the first blocking member 3 is sleeved on the outside of the terminal 70 and the two first blocking members 3 are respectively disposed at both ends of the forming cavity, during injection molding, the rubber material in the forming cavity will be blocked by the first blocking member 3 when flowing axially, thereby preventing the rubber material from flowing out of the forming cavity, and further preventing the rubber material from flowing to other areas of the terminal 70 except the coated area 703, and preventing the rubber material from covering other areas of the terminal 70 except the coated area 703. Moreover, when the rubber material in the forming cavity flows radially, it can flow into the exhaust cavity through the gap, and the exhaust cavity is only provided on one side of the forming cavity, so that burrs are only formed on one side of the coated area 703 of the terminal 70, which is convenient for subsequent removal, thereby ensuring the rubber coating quality of the terminal 70.

[0051] It should be noted that the injection mold first closes the mold and then injects and molds. When closing the mold, the first mold core 11 and the second mold core 21 are attached to each other under the action of pressure, and the molding cavity is a sealed cavity; when injecting, since the rubber material is injected into the molding cavity, the air pressure in the molding cavity increases, and the first mold core 11 and the second mold core 21 are slightly separated under the action of air pressure to form a gap.

[0052] Please refer to Figure 6 , a glue injection channel 213 communicating with the second molding groove 211 is further provided on one side of the second mold core 21 close to the first mold core 11. When injecting, the glue material is injected into the molding cavity through the glue injection channel 213; the glue injection channel 213 is arranged on the side of the second molding groove 211 away from the second exhaust groove 212, so that the glue injection channel 213 and the second exhaust groove 212 are respectively distributed on both sides of the second molding groove 211, which is beneficial to the gas in the molding cavity being discharged into the exhaust cavity and the glue material in the molding cavity flowing into the exhaust cavity.

[0053] Please refer to Figure 1 and Figure 2 , in some embodiments, the vacuum pumping device is communicated with the second exhaust groove 212, so as to ensure that the molding cavity is in a vacuum state during injection. The injection mold further includes a vacuum monitor 60, the vacuum detector is arranged on the first module 1, and the vacuum detector is communicated with the molding cavity or the exhaust cavity, so that the change of the vacuum degree can be monitored. Among them, the vacuum detector can be a vacuum gauge or a barometric pressure detection sensor.

[0054] The thickness of the gap ranges from 0.002 mm to 0.04 mm, so that the thickness of the connecting arm between the flash and the injection molded product 80 is extremely thin and can be broken under slight external force, so that the flash on the injection molded product 80 can be easily removed. According to actual needs, the thickness of the gap can be 0.002 mm, 0.004 mm, 0.008 mm, 0.02 mm, 0.04 mm, etc.

[0055] The distance between the molding cavity and the exhaust cavity ranges from 0.2 mm to 0.3 mm, so that the distance between the molding cavity and the exhaust cavity is small, that is, the length of the gap is small, so that the length of the flash and the connecting arm of the plastic product is small, which is convenient for removing the flash. According to actual needs, the distance between the molding cavity and the exhaust cavity can be 0.2 mm, 0.22 mm, 0.24 mm, 0.28 mm, 0.3 mm, etc.

[0056] Please refer to Figure 6 and Figure 7 , the first exhaust groove 112 is recessed inward in a columnar shape, so that the waste formed in the exhaust cavity protrudes relative to the second mold core 21, which is convenient for grasping and taking out the waste.

[0057] Please refer to Figures 4 to 9, the first blocking member 3 includes a connecting portion 31 and a first blocking portion 32. The connecting portion 31 is disposed on the side of the first mold core 11 close to the second mold core 21, thereby fixing the first blocking member 3 on the first mold core 11. The first blocking portion 32 is connected to one end of the connecting portion 31 away from the first mold core 11. The first blocking portion 32 is in an arc shape adapted to the terminal 70, so that the first blocking portion 32 can be closely attached to the outer side of the terminal 70, improving the sealing performance between the first blocking portion 32 and the terminal 70.

[0058] According to actual needs, the first blocking portion 32 can be in a semi-circular arc shape, and the connecting portion 31 can be in a columnar shape. The connecting portion 31 is disposed at the middle position of the first blocking portion 32. When the molds are closed, the side of the first blocking portion 32 away from the first mold core 11 abuts against the second mold core 21, and the first blocking portion 32 is in sealing contact with the second mold core 21, which can prevent the rubber material from flowing out between the first blocking portion 32 and the second mold core 21.

[0059] Please refer to Figure 4 、 Figure 5 and Figure 8 , an installation hole 113 is provided on the side of the first mold core 11 close to the second mold core 21. The connecting portion 31 is assembled in the installation hole 113, and in the direction from the first mold core 11 towards the second mold core 21, the diameter of the connecting portion 31 gradually decreases, so that the connecting portion 31 and the installation hole 113 form a reverse buckle structure, which is beneficial to preventing the connecting portion 31 from detaching from the installation hole 113 and improving the connection firmness between the connecting portion 31 and the first mold core 11.

[0060] Please refer to Figure 6 and Figure 8 , a conical surface 321 is provided at one end of the first blocking portion 32 close to the first forming groove 111. The conical surface 321 is inclined towards the first forming groove 111, and the conical surface 321 of the first blocking portion 32 is attached to the side of the first mold core 11 close to the second mold core 21, which can improve the connection sealing performance between the first blocking portion 32 and the first mold core 11, thereby facilitating the first blocking member 3 to prevent the rubber material from overflowing axially from the forming cavity.

[0061] Please refer to Figure 5 、 Figure 6 、 Figure 7 、 Figure 9 and Figure 14, on one side of the terminal 70 close to the first mold core 11, there is a first notch 701. The first notch 701 is located within the area 703 to be coated. On one side of the terminal 70 close to the second mold core 21, there is a second notch 702. Both the first notch 701 and the second notch 702 communicate with the inner cavity of the terminal 70. The rubber material can flow into the inner cavity of the terminal 70 through the first notch 701, so that the rubber material fills the inner cavity of the terminal 70 in the area 703 to be coated. The injection mold further includes a second blocking member 4 provided on the side of the second mold core 21 close to the first mold core 11. There are two second blocking members 4, and the two second blocking members 4 are respectively arranged at both ends of the second forming groove 211, and the second blocking member 4 passes through the second notch 702 and abuts against the inner wall of the terminal 70. Among them, the two second blocking members 4 seal the inner cavity of the terminal 70 in the area 703 to be coated, so that the second blocking member 4 can prevent the rubber material from flowing from the inner cavity of the area 703 to be coated of the terminal 70 into the inner cavities of other areas, further avoiding the generation of overflow glue.

[0062] It should be understood that the first blocking member 3 prevents the rubber material outside the terminal 70 from flowing axially from the area 703 to be coated to other areas, and the second blocking member 4 prevents the rubber material in the inner cavity of the terminal 70 from flowing axially from the area 703 to be coated to other areas, thereby avoiding the phenomenon of overflow glue.

[0063] Please refer to Figure 5 and Figure 7 , on the side of the second mold core 21 close to the first mold core 11, there is a protrusion 214. The protrusion 214 passes through the second notch 702 and extends into the inner cavity of the terminal 70. On the side of the protrusion 214 close to the first mold core 11, there is an installation groove; the second blocking member 4 is assembled in the installation groove, which can not only fix the second blocking member 4 on the second mold core 21, but also ensure that the second blocking member 4 is located in the inner cavity of the terminal 70. Moreover, the side of the second blocking member 4 away from the protrusion 214 abuts against the inner wall of the terminal 70, so that the second blocking member 4 is in sealing contact with the inner wall of the terminal 70, so that the second blocking member 4 can prevent the rubber material in the inner cavity of the terminal 70 from flowing axially from the area 703 to be coated to other areas.

[0064] There is a gap between the side of the protrusion 214 close to the first mold core 11 and the inner wall of the terminal 70. Setting the gap can avoid hard contact between the protrusion 214 and the terminal 70, thereby preventing indentations from being generated on the terminal 70 and avoiding damage to the terminal 70.

[0065] Please refer to Figure 6 and Figure 9, the second blocking member 4 includes a first blocking portion 32 and an abutting portion 42. The second blocking portion 41 is arc-shaped and assembled in the installation groove, so that the second blocking portion 41 is adapted to the inner wall of the terminal 70, improving the contact tightness between the second blocking portion 41 and the terminal 70. There are two abutting portions 42, and the two abutting portions 42 are respectively connected to both ends of the second blocking portion 41. The side of the abutting portion 42 away from the second mold core 21 abuts against the first blocking member 3, so that the abutting portion 42 is in sealing contact with the first blocking member 3, which is beneficial to preventing the rubber material from overflowing from the molding cavity.

[0066] According to actual needs, the abutting portion 42 is attached to the side of the second mold core 21 close to the first mold core 11, and the abutting portion 42 abuts against the conical surface 321 of the first blocking portion 32.

[0067] Both the first blocking member 3 and the second blocking member 4 are flexible, so that both the first blocking member 3 and the second blocking member 4 are in flexible contact with the terminal 70, that is, soft contact, which can not only improve the contact tightness between the first blocking member 3 and the second blocking member 4 and the terminal 70, but also avoid generating indentations on the terminal 70. According to actual needs, the first blocking member 3 and the second blocking member 4 can be made of silicone or rubber materials.

[0068] It should be noted that for the terminal 70 plated with a coating, the soft contact between the first blocking member 3 and the second blocking member 4 and the terminal 70 can avoid coating damage.

[0069] Please refer to Figure 1 、 Figure 2 and Figure 10 , the first module 1 further includes a top plate 12 and a liquid inlet plate 13. The liquid inlet plate 13 is arranged on the side of the top plate 12 close to the second mold core 21. The liquid inlet plate 13 is connected to the first mold core 11. The liquid inlet plate 13 is provided with a first receiving groove, and the top plate 12 is provided with a receiving cavity communicating with the first receiving groove; the injection mold further includes a runner plate 5, a cold nozzle 6 and a glue injection plate 7. A second receiving groove 51 is provided on one side of the runner plate 5. The runner plate 5 is received in the first receiving groove and is detachably connected to the liquid inlet plate 13; one end of the cold nozzle 6 is received in the second receiving groove 51, and the cold nozzle 6 is slidably assembled on the liquid inlet plate 13; the glue injection plate 7 is detachably connected to the side of the runner plate 5 away from the cold nozzle 6, and the glue injection plate 7 is received in the receiving cavity.

[0070] Since the runner plate 5 is detachably connected to the liquid inlet plate 13, the glue injection plate 7 is detachably connected to the runner plate 5, and the cold nozzle 6 is slidably assembled on the liquid inlet plate 13 and one end is located in the second receiving groove 51, after the glue injection plate 7 and the runner plate 5 are disassembled, the cold nozzle 6 is exposed in the first receiving groove and the receiving cavity. At this time, the cold nozzle 6 can be directly taken out to complete the disassembly of the cold nozzle 6.

[0071] During the disassembly process of the cold nozzle 6, it is not necessary to disassemble the entire first module 1, nor is it necessary to disassemble and separate the liquid inlet plate 13 and the top plate 12. It is only necessary to disassemble the glue injection plate 7 and the runner plate 5, and then slide the cold nozzle 6 out, making the disassembly method of the cold nozzle 6 relatively simple and facilitating the replacement of the cold nozzle 6.

[0072] Please refer to Figure 2 , Figure 3 and Figure 10 , the glue injection assembly further includes a first locking member 10 and a second locking member 20. The first locking member 10 is assembled on the runner plate 5 and connected to the liquid inlet plate 13. The first locking member 10 is used to lock the runner plate 5 to the liquid inlet plate 13. Among them, the first locking member 10 can be a screw, and the liquid inlet plate 13 is provided with a screw hole. The screw is connected in the screw hole to achieve a detachable connection between the runner plate 5 and the liquid inlet plate 13. The second locking member 20 is assembled on the glue injection plate 7 and connected to the runner plate 5. The second locking member 20 is used to lock the glue injection plate 7 to the runner plate 5. Among them, the second locking member 20 can be a screw, and the runner plate 5 is provided with a screw hole. The screw is connected in the screw hole to achieve a detachable connection between the glue injection plate 7 and the runner plate 5.

[0073] According to actual needs, both the first locking member 10 and the second locking member 20 are provided with multiple ones to improve the connection firmness between the runner plate 5 and the liquid inlet plate 13, and between the glue injection plate 7 and the liquid inlet plate 13.

[0074] In some embodiments, the runner plate 5 is also used for detachable connection with the liquid inlet plate 13, which can not only fix the runner plate 5 on the liquid inlet plate 13, but also enable the glue injection plate 7 and the runner plate 5 to be detachably connected to the liquid inlet plate 13 as a whole.

[0075] Please refer to Figure 10 , the injection mold further includes a third locking member 30. The third locking member 30 is assembled on the glue injection plate 7 and passes through the runner plate 5 to be connected to the liquid inlet plate 13. The third locking member 30 is used to lock the glue injection plate 7 to the liquid inlet plate 13. Among them, the third locking member 30 can be a screw, the runner plate 5 is provided with a through hole, and the liquid inlet plate 13 is provided with a screw hole. The screw passes through the through hole and is connected in the screw hole to achieve a detachable connection between the glue injection plate 7 and the liquid inlet plate 13.

[0076] According to actual needs, the third locking member 30 can be provided with multiple ones to improve the connection firmness between the glue injection plate 7 and the liquid inlet plate 13.

[0077] Please refer to Figure 2 , Figure 3 and Figure 13, the cold nozzle 6 includes an outer sleeve 61 and an inner core 62. The outer sleeve 61 is used for slidingly assembling on the liquid inlet plate 13; the inner core 62 is slidingly assembled within the outer sleeve 61. The inner core 62 and the outer sleeve 61 enclose a cooling channel 63. One end of the inner core 62 is disposed outside the outer sleeve 61 and received within the second receiving groove 51. Thus, after the injection plate 7 and the runner plate 5 are disassembled, since the inner core 62 is exposed in the first receiving groove, the inner core 62 can be taken out.

[0078] Please refer to Figure 2 and Figure 13 , a first step 621 is provided at one end of the inner core 62 away from the runner plate 5. The first step 621 is sleeved on the outside of the inner core 62 and abuts against the inner wall of the outer sleeve 61. The inner core 62, the first step 621 and the outer sleeve 61 together enclose the cooling channel 63.

[0079] In some embodiments, a second step 623 is provided at one end of the inner core 62 located in the second receiving groove 51. The inner core 62 can be taken out by holding the second step 623, thus facilitating the removal of the inner core 62.

[0080] Please refer to Figure 3 , Figure 12 and Figure 13 , the outer sleeve 61 is provided with a liquid inlet 611 and a liquid outlet 612. Both the liquid inlet 611 and the liquid outlet 612 are in communication with the cooling channel 63. The coolant flows into the cooling channel 63 through the liquid inlet 611 and flows out of the cooling channel 63 through the liquid outlet 612. A first seal 40 and a second seal 50 are sleeved on the outside of the outer sleeve 61. The first seal 40 and the second seal 50 are distributed on opposite sides of the liquid inlet 611 and the liquid outlet 612, and the first seal 40 and the second seal 50 are used for sealing contact with the liquid inlet plate 13. The first seal 40 and the second seal 50 can prevent the leakage of the coolant around the liquid inlet 611 or the liquid outlet 612, thereby improving the sealing performance of the cooling system. Among them, the first seal 40 and the second seal 50 can be sealing rings.

[0081] Please refer to Figure 3 , Figure 12 and Figure 13 , in some embodiments, a third step 64 is provided at one end of the outer sleeve 61 close to the runner plate 5. A step groove is provided on the liquid inlet plate 13. The third step 64 is received within the step groove. The third step 64 and the step groove cooperate with each other to prevent the outer sleeve 61 from continuing to slide away from the runner plate 5. The liquid inlet 611 and the liquid outlet 612 are provided on the third step 64. An annular first positioning groove 641 and a second positioning groove 642 are provided on the third step 64. The first positioning groove 641 and the second positioning groove 642 are respectively located on opposite sides of the liquid outlet 612 and the liquid inlet 611. The first seal 40 and the second seal 50 are respectively assembled within the first positioning groove 641 and the second positioning groove 642.

[0082] Please refer to Figure 2 and Figure 13 At one end of the inner core 62 away from the runner plate 5, a third seal is provided. The third seal is sleeved on the outside of the inner core 62 and is in sealing contact with the inner wall of the outer sleeve 61 to prevent the coolant in the cooling channel 63 from leaking at the end of the cold nozzle 6 away from the runner plate 5. Among them, the third seal can be an O-ring. A ring-shaped third positioning groove 6211 is provided on the first step 621, and the third seal is assembled in the third positioning groove 6211.

[0083] Please refer to Figure 2 and Figure 3 The glue injection plate 7 is provided with a glue injection hole. The runner plate 5 is provided with a glue passing groove 52 and a glue passing channel 53. The glue passing groove 52 communicates with the glue injection hole, and the glue passing channel 53 communicates with the glue passing groove 52. The cold nozzle 6 is provided with a pouring channel 622, and the pouring channel 622 communicates with the glue passing channel 53. The rubber material can be injected from the glue injection hole and flows into the molding cavity after passing through the glue passing groove 52, the glue passing channel 53 and the pouring channel 622.

[0084] Please refer to Figure 11 In some embodiments, the glue passing groove 52 can be a symmetric groove. The glue passing groove 52 is integrally in an I-shaped structure. The glue injection hole is disposed opposite to the middle position of the glue passing groove 52 so that the rubber material can flow more evenly to the left and right ends of the glue passing groove 52. The number of cold nozzles 6 is set according to actual needs. For example:

[0085] In a specific example, the cold nozzle 6 can be provided with eight. The eight cold nozzles 6 are arranged in two rows, with four cold nozzles 6 in each row. Then, there are eight glue passing channels 53, and the eight glue passing channels 53 are arranged in two rows, with four glue passing channels 53 in each row.

[0086] Please refer to Figure 1 and Figure 2 The injection mold further includes a first heating element 8 and a second heating element 9. The first heating element 8 is disposed in the first module 1, and the first heating element 8 is disposed on the side of the first mold core 11 away from the second mold core 21; the second heating element 9 is disposed in the second module 2, and the second heating element 9 is disposed on the side of the second mold core 21 away from the first mold core 11. The first heating element 8 can heat the first mold core 11, and the second heating element 9 can heat the second mold core 21, so as to ensure the temperature in the molding cavity and enable the rubber material to be cured and molded in the molding cavity.

[0087] It should be noted that the rubber material is a thermosetting material. The cold nozzle 6 can cool the rubber material so that the rubber material maintains good fluidity during the injection process; the first heating element 8 and the second heating element 9 can heat the rubber material in the molding cavity, so that the rubber material is quickly cured and molded in the molding cavity.

[0088] Please refer to Figure 1 andFigure 2 In some embodiments, the first module 1 further includes a first mold base 14. The first mold core 11 is fixed to the first mold base 14, and both ends of the first heating element 8 are respectively fixed to the first mold base 14. The second module 2 further includes a second mold base 22, and both ends of the second heating element 9 are respectively fixed to the second mold base 22.

[0089] Please refer to Figure 12 , a heat insulation sleeve 65 is also sleeved and fixed on the outside of the cold nozzle 6. The heat insulation sleeve 65 can prevent the heat generated by the first heating element 8 from being conducted to the cold nozzle 6; wherein, the heat insulation sleeve 65 is sleeved on the outside of the outer sleeve 61.

[0090] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An injection mold for forming an overmolded product on a tubular terminal to be overmolded, characterized in that: The injection mold comprises: A first die set includes a first die core having a first molding groove and a first exhaust groove on one side thereof, wherein the first exhaust groove and the first molding groove are spaced apart and the first exhaust groove is disposed on one side of the first molding groove; The second die set comprises a second die core slidably mounted on a side of the first die core provided with the first molding groove, the second die core is provided with a second molding groove and a second exhaust groove on a side close to the first die core, the second exhaust groove and the second molding groove are spaced apart, and the second exhaust groove is provided on one side of the second molding groove; and A first blocking member is arranged on a side of the first mold core close to the second mold core, and two first blocking members are provided, and the two first blocking members are respectively arranged at two ends of the first molding groove; Among them, when the film is closed, the first mold core is fitted with the second mold core, the first molding groove and the second molding groove are sealed to form a molding cavity, the first exhaust groove and the second exhaust groove are sealed to form an exhaust cavity, the area to be covered of the terminal is located in the molding cavity, the first blocking member is sleeved on the outside of the terminal, and the two first blocking members are respectively arranged at both ends of the molding cavity; during injection molding, a gap connecting the molding cavity and the exhaust cavity is formed between the second mold core and the second mold core.

2. The injection mold according to claim 1, characterized in that: A glue injection channel communicating with the second molding groove is further provided on a side of the second mold core close to the first mold core, and the glue injection channel is provided on a side of the second molding groove away from the second exhaust groove.

3. The injection mold according to claim 1, characterized in that: The thickness of the gap ranges from 0.002 mm to 0.04 mm.

4. The injection mold according to claim 1, characterized in that: The first blocking member comprises: a connecting portion, arranged on a side of the first mold core close to the second mold core; and The first blocking portion is connected to an end of the connecting portion away from the first mold core, and the first blocking portion is in an arc shape adapted to the terminal.

5. The injection mold according to claim 4, characterized in that: A mounting hole is provided on one side of the first mold core close to the second mold core, the connecting portion is assembled in the mounting hole, and the diameter of the connecting portion gradually decreases in the direction from the first mold core to the second mold core.

6. The injection mold according to claim 1, characterized in that: A first notch is provided on a side of the terminal close to the first mold core, the first notch is located in the area to be coated, and a second notch is provided on a side of the terminal close to the second mold core, the first notch and the second notch are both connected to the inner cavity of the terminal; The injection mold further includes a second blocking member disposed on a side of the second mold core close to the first mold core, two second blocking members are provided, the two second blocking members are respectively disposed at two ends of the second molding groove, and the second blocking member passes through the second notch and abuts against the inner wall of the terminal; Wherein, the two second blocking members seal the inner cavity of the terminal located in the area to be coated.

7. The injection mold according to claim 6, characterized in that: The first blocking member and the second blocking member are both flexible.

8. The injection mold according to claim 1, characterized in that: The first mold assembly further includes a top plate and a liquid inlet plate, wherein the liquid inlet plate is arranged on a side of the top plate close to the second mold core, the liquid inlet plate is connected to the first mold core, a first receiving groove is arranged on the liquid inlet plate, and the top plate is provided with a receiving cavity communicated with the first receiving groove; The injection mold also includes a runner plate, a cold nozzle and a glue injection plate. A second accommodating groove is provided on one side of the runner plate. The runner plate is accommodated in the first accommodating groove and is detachably connected to the liquid inlet plate. One end of the cold nozzle is accommodated in the second accommodating groove, and the cold nozzle is slidably assembled on the liquid inlet plate. The glue injection plate is detachably connected to a side of the runner plate away from the cold nozzle, and the glue injection plate is accommodated in the accommodating cavity.

9. The injection mold according to claim 8, characterized in that: The cold nozzle comprises: a housing, adapted to be slidably mounted on the liquid inlet plate; and The inner core is slidably assembled in the outer sleeve, and the inner core and the outer sleeve are combined to form a cooling channel. One end of the inner core is arranged outside the outer sleeve and is accommodated in the second receiving groove.

10. The injection mold according to claim 1, characterized in that: The injection mold further comprises: A first heating element is disposed on the first mold assembly, wherein the first heating element is disposed on a side of the first mold core away from the second mold core; and The second heating element is arranged on the second mold assembly, and the second heating element is arranged on a side of the second mold core away from the first mold core.

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