Injection molding mold with multiple feed ports

Abstract

The present application relates to the field of injection molding technology, and specifically to an injection molding mold with multiple feed ports, including an upper mold and a lower mold, wherein the lower mold is provided with multiple lower mold cavities, and the upper mold is provided with multiple upper mold cavities corresponding to the lower mold cavities, and also includes a water inlet connected to two adjacent upper mold cavities and or between two adjacent lower mold cavities, and the upper mold is also provided with a plug hole for a glue injection gun to extend into the upper edge of the water inlet to complete the glue injection, and the lower end of the plug hole is connected to the water inlet, and the number of the plug holes corresponds to the number of the water inlets. Compared with the existing injection molding method of using a single feed port in combination with a tree-like water inlet to simultaneously inject multiple mold cavities with a single feed port, the injection molding method of the present application of multiple plug holes in combination with multiple water inlets can reduce the length of the water inlet to a minimum, and the total length of the water inlet of the present application is only one-tenth of that of the existing mold with the same number of holes, thereby reducing the waste of raw materials.

Description

Technical Field

[0001] The present application relates to the technical field of injection molding, and in particular to an injection molding mold with multiple feed ports. Background Art

[0002] The connection between the wiring harness and the PCB board of current electronic products needs to be injection molded and solidified through the injection molding process to form an encapsulated inner mold, so as to achieve the purpose of protecting the solder joints and connecting wires. It is particularly suitable for the inner mold encapsulation processing of the connection between the PCB board and the wiring harness of the USB male or female connector. The raw materials of the existing injection molding process mainly include LE-PE material and hot melt adhesive. The liquid adhesive is added to the nozzle through a single feed port, and is injected into the corresponding mold cavity through multiple branch channels. However, the mold design using such a single feed port has many branch channels, a high proportion of nozzle materials, and a low raw material utilization rate. Therefore, how to effectively overcome the above technical defects is a problem that the current market needs to solve. Summary of the invention

[0003] In order to overcome the shortcomings and deficiencies existing in the prior art, the purpose of the present application is to provide an injection molding mold with multiple feed ports, which adopts an injection molding method of multi-plug-in holes for glue injection. Compared with the existing injection molding method of using a single feed port in combination with a tree-shaped sprue to simultaneously inject multiple mold cavities with a single feed port, the injection molding method of multiple plug-in holes combined with multiple sprues of the present application can reduce the length of the sprue to a minimum. The total length of the sprue of the present application is only one-tenth of that of the existing mold with the same number of holes, which greatly reduces the waste of raw materials caused by excessive sprue material.

[0004] The objective of the present application is achieved through the following technical solution: a multi-feed injection molding die, comprising an upper die and a lower die, the lower die being provided with a plurality of lower die cavities, the upper die being provided with a plurality of upper die cavities corresponding to the lower die cavities, and also comprising a water outlet connected between two adjacent upper die cavities and / or two adjacent lower die cavities, the upper die also being provided with a plug hole for a glue injection gun to extend into the upper edge of the water outlet to complete glue injection, the lower end of the plug hole being connected to the water outlet, and the number of the plug holes corresponds to the number of the water outlets.

[0005] The plug-in hole is composed of a main circular hole, an inverted cone shrinkage hole, an assembly hole, and a glue injection hole which are connected in sequence, and the lower end of the glue injection hole is connected to the water inlet.

[0006] A positioning module for fixing the end of the product to be injected is sandwiched between the upper mold and the lower mold, and the positioning module is provided with a plurality of positioning holes for inserting the end of the product to be injected on one side facing the upper mold cavity and / or the lower mold cavity.

[0007] It also includes a limiting strip for pressing down the product to be injected, and the lower end surface of the limiting strip is provided with a plurality of limiting grooves matching with the product to be injected.

[0008] The lower mold is provided with a lower assembly groove, the upper mold is provided with an upper assembly groove, the lower half of the positioning module is located in the lower assembly groove, and after the molds are closed, the upper half of the positioning module is snapped into the upper assembly groove.

[0009] Wherein, the limiting groove is located between the upper mold cavity and the positioning hole, and the limiting strip is fixed to the upper mold.

[0010] Wherein, the lower mold is fixed with a mold alignment column, and the upper mold is provided with a mold alignment hole for the mold alignment column to be inserted.

[0011] It also includes an opening and closing driving mechanism for driving the upper mold and the lower mold to complete the mold closing.

[0012] Among them, the opening and closing drive mechanism includes an upper horizontal plate, at least two guide columns arranged parallel to each other, a sleeve sleeved outside the guide columns, a lower horizontal plate, and a lifting motor or a lifting cylinder. The upper mold is fixed to the upper horizontal plate, the upper end of the guide column is fixedly connected to the upper horizontal plate, the lower end of the guide column is fixedly connected to the lower horizontal plate, and the output end of the lifting motor or the lifting cylinder is connected to the lower horizontal plate.

[0013] The beneficial effects of the present application are as follows: the injection molding mold of the present application adopts an injection molding method of multi-plug-in holes for glue injection. Compared with the existing injection molding method of using a single feed port in combination with a tree-like sprue to realize simultaneous injection molding of multiple mold cavities with a single feed port, the injection molding method of multiple plug-in holes in combination with multiple sprues, in which one plug-in hole is connected to a corresponding sprue, can reduce the length of the sprue to a minimum. The total length of the sprue of the present application is often less than one-tenth of the existing mold with the same amount of LE-PE material, which greatly reduces the waste of raw materials caused by excessive sprue material. In the existing multi-cavity injection molding that uses a single feed port in combination with a tree-like sprue, a bundle of sprue material corresponds to multiple molded products, and the sprue material is adhered to multiple products, making it extremely inconvenient to remove the sprue. The present application has one sprue corresponding to two products and the two ends of the sprue are respectively connected to one side of the two products. Removal is simple and convenient, and it is not easy to damage the molded product. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a stereogram of the present application;

[0015] Figure 2 It is a partial structural cross-sectional view of the present application;

[0016] Figure 3 is another stereogram of the present application;

[0017] Figure 4It is a partial structural exploded view of the present application;

[0018] Figure 5 This application Figure 4 Schematic diagram from another angle;

[0019] Figure 6 Schematic diagram of the gun head structure of the glue injection gun of Example 1 of the present application;

[0020] Figure 7 Schematic diagram of the gun head structure of the glue injection gun of Example 2 of the present application;

[0021] Figure 8 This application Figure 2 A partial enlarged view of area A.

[0022] The accompanying drawings are marked as: upper mold 301, upper mold cavity 302, lower mold 303, lower mold cavity 304, sprue 305, plug-in hole 306, main circular hole 307, inverted cone shrinkage hole 308, assembly hole 309, glue injection hole 310, positioning module 311, positioning hole 312, limit strip 313, limit groove 314, upper assembly groove 315, lower assembly groove 316, alignment column 317, alignment hole 318, upper cross plate 319, guide column 320, sleeve 321, lower cross plate 322, lifting motor or lifting cylinder 323, gun head 324, guide cylinder 325, limit inverted cone 326, middle cylinder 327, glue injection cone head 328. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of those skilled in the art, the following embodiments and attached Figure 1-Figure 7 To further illustrate the present application, the contents mentioned in the implementation mode are not intended to limit the present application.

[0024] Embodiment 1: A multi-feed port injection molding die, comprising an upper die 301 and a lower die 303, wherein the lower die 303 is provided with a plurality of lower die cavities 304, the upper die 301 is provided with a plurality of upper die cavities 302 corresponding to the lower die cavities 304, and further comprising a sprue 305 connected between two adjacent upper die cavities 302 and / or between two adjacent lower die cavities 304, the upper die 301 is further provided with a plug hole 306 for a glue injection gun to extend into the upper edge of the sprue 305 to complete glue injection, the lower end of the plug hole 306 is connected to the sprue 305, and the number of the plug holes 306 corresponds to the number of the sprues 305.

[0025] The plug-in hole 306 is composed of a main circular hole 307 , an inverted cone shrinkage hole 308 , an assembly hole 309 , and a glue injection hole 310 which are connected in sequence, and the lower end of the glue injection hole 310 is connected to the water inlet 305 .

[0026] Specifically, the two ends of the water inlet 305 are respectively connected to the opposite sides of the two adjacent upper mold cavities 302 and / or the two adjacent lower mold cavities 304. The aperture of the main circular hole 307 is equal to the maximum aperture of the inverted cone shrinkage hole 308, the minimum aperture of the inverted cone shrinkage hole 308 is equal to the aperture of the assembly hole 309, the aperture of the glue injection hole 310 is smaller than the aperture of the assembly hole 309, and the depth of the glue injection hole 310 is less than 0.5 cm.

[0027] The glue injection gun used in the embodiment includes a gun head 324 that cooperates with the plug hole 306 .

[0028] The shape of the gun head 324 adopts an inverted cone structure design, and the outer diameter of the smallest end of the gun head 324 is smaller than the aperture of the injection hole 310. In actual application, the gun head 324 is inserted into the plug-in hole 306, and the front end of the gun head 324 is inserted into the injection hole 310. When the gun head 324 is inserted into place, the side of the gun head 324 and the upper end of the injection hole 310 are closed, and the injection begins.

[0029] A positioning module 311 for fixing the end of the product to be injected is sandwiched between the upper mold 301 and the lower mold 303, and the positioning module 311 is provided with a plurality of positioning holes 312 for inserting the end of the product to be injected on one side facing the upper mold cavity 302 and / or the lower mold cavity 304.

[0030] It also includes a limiting strip 313 for pressing down the product to be injected, and the lower end surface of the limiting strip 313 is provided with a plurality of limiting grooves 314 that cooperate with the product to be injected.

[0031] The lower mold 303 is provided with a lower assembly groove 316, and the upper mold 301 is provided with an upper assembly groove 315. The lower half of the positioning module 311 is located in the lower assembly groove 316. After the mold is closed, the upper half of the positioning module 311 is inserted into the upper assembly groove 315. Specifically, the positioning module 311 is fixedly connected to the lower assembly groove 316.

[0032] Among them, the limiting groove 314 is located between the upper mold cavity 302 and the positioning hole 312, and the limiting strip 313 is fixed to the upper mold 301. Specifically, the product to be injected can be a connector with a wiring harness, a USB female / male connector with a wiring harness, a Type-C female / male connector with a wiring harness, or other connectors with a wiring harness. In the actual application of the present application, the end of the product to be injected is inserted into the positioning hole 312 of the positioning module 311 to complete the initial positioning. After the mold is closed, the limiting strip 313 and the limiting groove 314 perform secondary positioning on the part of the product to be injected that is adjacent to the opening of the positioning hole 312. The positioning stability is good, and the product to be injected is not easy to loosen or shift after being impacted by the liquid glue, thereby ensuring the molding quality of the product to be injected.

[0033] The lower mold 303 is fixed with a mold alignment column 317, and the upper mold 301 is provided with a mold alignment hole 318 for the mold alignment column 317 to be inserted.

[0034] It also includes an opening and closing driving mechanism for driving the upper mold 301 and the lower mold 303 to complete mold closing.

[0035] Among them, the opening and closing drive mechanism includes an upper horizontal plate 319, at least two guide columns 320 arranged parallel to each other, a sleeve 321 sleeved outside the guide column 320, a lower horizontal plate 322, and a lifting motor or a lifting cylinder 323. The upper mold 301 is fixed to the upper horizontal plate 319, the upper end of the guide column 320 is fixedly connected to the upper horizontal plate 319, the lower end of the guide column 320 is fixedly connected to the lower horizontal plate 322, and the output end of the lifting motor or the lifting cylinder 323 is connected to the lower horizontal plate 322.

[0036] In the packaging harness injection molding process at the connection between the harness of the connector or connecting wire and the PCB board, LE-PE material is cheap (12.3 yuan / kg), has high hardness, and has good protection performance for the product. It is widely used. The proportion of LE-PE material in the current harness injection molding process is about 95%, and the rest uses hot melt adhesive with a higher price. Although LE-PE material is good quality and cheap, due to its high viscosity and hardness, the injection pressure required in the existing injection molding process is also extremely high. At the same time, the water inlet 305 of the existing molding mold adopts a tree-shaped water inlet 305 design with a single feed inlet and multiple branch water inlets 305. The length of the water inlet 305 is long, which greatly increases the pressure required for LE-PE material injection molding. Under the action of high pressure, the liquid glue forms a high-speed and high-pressure glue fluid, which has a great impact on the thin wires and solder joints of the wire harness. Therefore, the product scrap rate caused by the glue fluid breaking the thin wires or solder joints has always remained high. Some manufacturers use hot melt adhesive to reduce the pressure of the injection molding process, thereby reducing the scrap rate of the product. However, hot melt adhesive is expensive (130 yuan / kg), and is soft after curing and molding. It has low hardness and provides low protection for wiring harnesses and solder joints at the connection. The connection is easily damaged during product use, resulting in short circuits. The overall service life of the product is short. In addition, the existing low-pressure plastic machines that use hot melt adhesive cannot achieve low pressure in the true sense. They can only achieve low pressure when using hot melt adhesive, and cannot use LE-PE materials for low-pressure injection molding. The multi-feed injection molding mold of the present application adopts a one-to-one injection structural design of the plug hole 306 and the sprue 305. Compared with the prior art, the sprue 305 is only used to connect two adjacent mold cavities. Under the premise of the same number of mold cavities, the length of the sprue 305 of the present application is less than one tenth of the prior art. At the same time, the glue injection gun can be extended to the edge of the sprue 305 for glue injection, further shortening the length of the sprue 305, thereby greatly reducing the pressure required for LE-PE material injection molding, realizing low-pressure injection molding, thereby solving the problem of high product scrap rate caused by the rubber fluid breaking the fine wire or breaking the welding point, greatly improving production efficiency and economic benefits.

[0037] Example 2

[0038] The difference between this embodiment and the first embodiment is that the structure of the gun head 324 is different.

[0039] The gun head 324 is composed of a guide cylinder 325, a limiting inverted cone 326, a middle cylinder 327, and a glue injection cone head 328 which are connected in sequence. In actual application, the guide cylinder 325 cooperates with the main circular hole 307 of the plug-in hole 306 to complete the guiding positioning of the gun head 324, the limiting inverted cone 326 cooperates with the inverted cone shrinkage hole 308 of the plug-in hole 306 to complete the insertion stroke limit of the gun head 324, and at the same time enhance the airtightness of the gun head 324 and the plug-in hole 306, the middle cylinder 327 cooperates with the assembly hole 309 to perform a secondary alignment operation to ensure the matching accuracy, and at the same time completes the closure of the glue injection hole 310, further enhancing the airtightness between the gun head 324 and the plug-in hole 306, and the glue injection cone head 328 is inserted into the glue injection hole 310 for glue injection.

[0040] The above embodiments are preferred implementation schemes of the present application. In addition, the present application may also be implemented in other ways. Any obvious replacement without departing from the concept of the present application is within the protection scope of the present application.

Claims

1. An injection molding mold with multiple feed ports, comprising an upper mold and a lower mold, wherein the lower mold is provided with a plurality of lower mold cavities, the upper mold is provided with a plurality of upper mold cavities corresponding to the lower mold cavities, and further comprising a water inlet connected between two adjacent upper mold cavities and or between two adjacent lower mold cavities, the upper mold is further provided with a plug hole for a glue injection gun to extend into the upper edge of the water inlet to complete glue injection, the lower end of the plug hole is connected to the water inlet, and the number of the plug holes corresponds to the number of the water inlets; The plug-in hole is composed of a main circular hole, an inverted cone shrinkage hole, an assembly hole, and a glue injection hole which are connected in sequence, and the lower end of the glue injection hole is connected to the water inlet; A positioning module for fixing the end of the product to be injected is sandwiched between the upper mold and the lower mold, and a plurality of positioning holes for inserting the end of the product to be injected are arranged on the side of the positioning module facing the upper mold cavity and / or the lower mold cavity; It also includes a limiting strip for pressing down the product to be injected, wherein the lower end surface of the limiting strip is provided with a plurality of limiting grooves matching the product to be injected; The limiting groove is located between the upper mold cavity and the positioning hole, and the limiting strip is fixed to the upper mold.

2. The multi-feed injection molding die according to claim 1, characterized in that: The lower mold is provided with a lower assembly groove, the upper mold is provided with an upper assembly groove, the lower half of the positioning module is located in the lower assembly groove, and after the molds are closed, the upper half of the positioning module is snapped into the upper assembly groove.

3. The multi-feed injection molding die according to claim 1, characterized in that: The lower mold is fixed with a mold alignment column, and the upper mold is provided with a mold alignment hole for the mold alignment column to be inserted.

4. The multi-feed injection molding die according to claim 1, characterized in that: It also includes an opening and closing driving mechanism for driving the upper mold and the lower mold to complete mold closing.

5. The multi-feed injection molding die according to claim 4, characterized in that: The opening and closing driving mechanism includes an upper horizontal plate, at least two guide pillars arranged parallel to each other, a sleeve sleeved outside the guide pillars, a lower horizontal plate, and a lifting motor or a lifting cylinder. The upper mold is fixed to the upper horizontal plate, the upper end of the guide pillar is fixedly connected to the upper horizontal plate, the lower end of the guide pillar is fixedly connected to the lower horizontal plate, and the output end of the lifting motor or the lifting cylinder is connected to the lower horizontal plate.

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