Split type pressure relief injection mold

Abstract

The utility model discloses a split type pressure relief injection mold, which comprises a demolding base and a main mold detachably arranged on the demolding base, the main mold comprises a lower mold matched with the demolding base, the demolding base is provided with a demolding ejector block capable of moving upwards, the lower mold is provided with an ejector pin channel penetrating through the lower mold up and down, and the ejector pin channel is communicated with the demolding base. A demolding ejector pin is mounted in the ejector pin channel; a plurality of mold cavities are formed in the main mold, glue inlet channels of the multiple mold cavities are converged and then lead to a glue injection port, the mold cavities are further connected with pressure relief buffer glue channels respectively, and the pressure relief buffer glue channels can remove redundant injection molding materials, so that bad glue overflow of products is prevented; meanwhile, a traditional mold is designed to be of an up-down split type structure, the mode that a shared and universal demolding base and a product main mold are mutually separated and combined is adopted, the mold development cost is reduced by half, and the mold development and manufacturing period is greatly shortened.

Description

Technical Field

[0001] This utility model relates to the field of wire harness connector production mold application, specifically to a split-type pressure relief injection mold used in hot melt adhesive injection molding. Background Technology

[0002] The information age places increasingly higher demands on wire harness connectors, not only in terms of increased information carrying capacity but also in terms of enhanced functionality. Therefore, wire harness connectors tailored to different applications have emerged. To ensure connector quality and prevent issues such as solder joint detachment due to pulling, modern wire harness connectors incorporate internal cushioning blocks. These blocks are typically obtained through hot melt injection molding. The process involves arranging the wire harness cores in a mold, injecting hot melt adhesive, and then removing the adhesive after it hardens to obtain the wire harness with the cushioning block.

[0003] As existing wire harness connectors become increasingly diverse, different buffer blocks are often designed for different connectors. However, with the increasing thickness and number of core wires in existing wire harness connectors, sealing the connectors with adhesive has become difficult. This is mainly due to the difficulty in controlling the amount of adhesive injected into the thicker core wires. Excessive injection may cause the buffer block to expand later, while insufficient injection directly affects the quality of the buffer block. On the other hand, different buffer blocks require the development of different molds. Since mold development cycles are long and mold costs are high, the current development method of designing complete molds for different buffer blocks needs to be improved. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a split-type pressure relief injection mold that can share a universal demolding base, and the injection mold can also prevent the product from producing defective glue overflow.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is:

[0006] A split-type pressure relief injection mold includes a demolding base and a main mold detachably mounted on the demolding base. The main mold includes a lower mold that mates with the demolding base. The demolding base has an upwardly movable demolding ejector block. The lower mold has an ejector pin channel that extends vertically through the lower mold, and a demolding ejector pin is installed inside the ejector pin channel. The main mold has multiple cavities inside, and the injection channels of the multiple cavities converge and lead to the injection port. Each cavity is also connected to a pressure relief buffer channel. The distance from the bottom surface of the cavity to the bottom surface of the lower mold is less than the length of the demolding ejector pin.

[0007] Preferably, the lower mold includes a mounting plate at the bottom and a connector fixedly mounted on the upper surface of the mounting plate, with a lower template mounted on the upper surface of the connector; the ejector channel includes, from top to bottom, an upper section penetrating the lower template, a middle section penetrating the connector, and a lower section penetrating the mounting plate, the inner diameter of the middle section being larger than the inner diameters of the upper and lower sections; the ejector pin includes an upper section and a lower section, the connection between the upper and lower sections being expanded to form an ejector pin retainer, the outer diameter of the retainer pin being approximately equal to the inner diameter of the middle section and located inside the middle section, the outer diameter of the upper section being approximately equal to the inner diameter of the upper section, and a gap existing between the upper section and the middle section, the gap being filled with a reset mechanism that allows the retainer pin to engage with the upper surface of the mounting plate.

[0008] Preferably, the mold cavity is a square mold cavity and is provided with an inlet and an outlet. The inlet and the outlet are respectively located at two opposite corners of the mold cavity. The inlet is connected to the inlet channel, and the outlet is connected to the pressure relief buffer channel.

[0009] Preferably, the glue outlet is higher than the glue inlet.

[0010] Preferably, ejector pin channels are provided below the center of the mold cavity, the confluence point of the injection channel, and the center of the pressure relief buffer channel.

[0011] Preferably, the mounting plate is detachably mounted on the demolding base via a quick-clamping plate. The demolding base has a mounting position that matches the mounting plate. The quick-clamping plate is horizontally slidably mounted on the demolding base and can slide between two states: releasing the mounting plate and clamping the mounting plate.

[0012] Preferably, the demolding top block is located at the center of the demolding base, and the upper end of the demolding top block is fixedly connected to a demolding top plate that can push the demolding ejector pin upward; a guide linear bearing is also fixedly installed on the bottom surface inside the demolding base, and the lower side of the demolding top plate protrudes downward to form a guide sleeve, which is sleeved on the guide linear bearing.

[0013] After adopting the above solution, since the present invention is designed with a pressure relief buffer channel, excess injection molding material can be eliminated, thereby preventing defective overflow of the product; at the same time, the present invention designs the traditional mold as an upper and lower split structure, and adopts a shared and universal demolding base and the main product mold to be separated and combined, which reduces the mold development cost by half and greatly shortens the mold development and manufacturing cycle. Attached Figure Description

[0014] Figure 1 This is a perspective view of an embodiment of the present utility model;

[0015] Figure 2 This is a perspective view of the embodiment from another angle;

[0016] Figure 3 This is a front view of the embodiment;

[0017] Figure 4 This is a side view of an embodiment;

[0018] Figure 5 yes Figure 4 The illustrated embodiment is a cross-sectional view along line AA;

[0019] Figure 6 This is a top view of the template below in the embodiment;

[0020] Figure 7 yes Figure 5 Enlarged view of a local structure. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] To simplify injection mold development, a split-type pressure relief injection mold is designed, such as... Figure 1-7 As shown, it includes a universally compatible demolding base 1 and a main mold 2 detachably mounted on the demolding base 1. The main mold 2 is independently developed and designed to meet the individual needs of different products, but the design of the main mold 2 requires compatibility with the universal demolding base 1. Specifically, the main mold 2 includes a lower mold 3 that is installed in conjunction with the demolding base 1. The demolding base 1 is provided with a demolding ejector block 4 that can move upwards. The lower mold 3 is provided with an ejector pin channel 5 that runs vertically through the lower mold 3. Demolding ejector pins 6 are installed inside the ejector pin channel 5. The main mold 2 has multiple cavities 7 inside. The injection channels 8 of the multiple cavities 7 converge and lead to the injection port 80. The cavities 7 are also connected to pressure relief buffer channels 9. The distance from the bottom surface of the cavity 7 to the bottom surface of the lower mold 3 is less than the length of the demolding ejector pins 6. During injection molding, the demolding ejector pins 6 descend to flatten the bottom surface of the cavity 7. After injection molding is completed, all the demolding ejector pins 6 are pushed up by the demolding ejector block 4 to achieve rapid demolding of the plastic block.

[0023] To enable the ejector block 4 to simultaneously lift all the ejector pins 6, the ejector block 4 can be positioned at the center of the ejector base 1. The upper end of the ejector block 4 is fixedly connected to the ejector plate 10, which can simultaneously lift the ejector pins 6. Meanwhile, to ensure the stability of the ejector plate 10 during the lifting process, a guide linear bearing 11 can be fixedly installed on the bottom surface inside the ejector base 1. The lower side of the ejector plate 10 protrudes downward to form a guide sleeve 12 that cooperates with the guide linear bearing 11. The guide sleeve 12 is fitted onto the guide linear bearing 11 and has a space reserved inside for the guide linear bearing 11 to extend into. The lower end of the ejector block 4 is rigidly connected to the mold control equipment. When the mold control equipment controls the ejector block 4 to lift, it drives the ejector plate 10 to move upward stably.

[0024] Since the buffer blocks of wire harness connectors are mostly square, the main mold 2 in this embodiment is designed with a square mold cavity 7, which is equipped with an inlet 71 and an outlet 72. The inlet 71 is connected to the inlet channel 8, and the outlet 72 is connected to the pressure relief buffer channel 9. This embodiment includes two mold cavities 7, so the inlet channel 8 can be designed in a cross shape, including a main inlet channel 81 connected to the injection port 80 and two branch inlet channels 82 formed after branching. The two branch inlet channels 82 are respectively connected to the two mold cavities 7 through the two inlet ports 71. A pressure relief buffer channel 9 is designed on the outer side of each of the two mold cavities 7, and the outlet 72 of each mold cavity 7 is connected to its respective pressure relief buffer channel 9. To prevent the heated molten glue from flowing into the pressure relief buffer channel 9 before filling the mold cavity 7, the inlet 71 and the outlet 72 can be set at two opposite corners in the mold cavity 7. Furthermore, the outlet 72 can be designed to be higher than the inlet 71.

[0025] After the injection-molded plastic block cools, it can be demolded. To ensure smooth demolding, ejector channels 5 can be designed below the center of the mold cavity, the junction of the injection channels, and the center of the pressure relief buffer channel. The ejector channels 5 are located in the lower mold 3 of the main mold 2. The lower mold 3 includes a mounting plate 31 at the bottom and a connector 32 fixedly mounted on the upper surface of the mounting plate 31. A lower template 33 is mounted on the upper surface of the connector 32. The mounting plate 31 is mainly used to adapt to the demolding base 1 to realize the connection between the main mold 2 and the demolding base 1. The connector 32 mainly realizes the connection between the mounting plate 31 and the upper lower template 33, and at the same time provides installation space for the ejector pins 6. The lower template 33 is mainly used to design appropriate grooves on its upper surface to cooperate with the upper mold 13 of the main mold 2 to form corresponding mold cavities 7 and various channels for the injection of plastic. The upper mold 13 of the main mold 2 moves up and down through a rigid connection with the mold control equipment to realize the closing and opening of the main mold 2.

[0026] In the lower mold 3, the ejector channel 5 includes, from top to bottom, an upper channel section 53 that penetrates the lower mold plate 33, a middle channel section 52 that penetrates the connector 32, and a lower channel section 51 that penetrates the mounting plate 31. To ensure that the ejector pin 6 is always located in the ejector channel 5, the inner diameter of the middle channel section 52 is designed to be larger than the inner diameters of the upper channel section 53 and the lower channel section 51. The ejector pin 6 includes an upper ejector pin section 61 and a lower ejector pin section 62. The connection between the upper ejector pin section 61 and the lower ejector pin section 62 is expanded to form an ejector pin retaining ring 63. The outer diameter of the ejector pin retaining ring 63 is equivalent to the inner diameter of the middle channel section 52 and is placed inside the middle channel section 52. The outer diameter of the upper section 61 of the ejector pin is approximately equal to the inner diameter of the upper section 53 of the channel. The upper half of the upper section 61 of the ejector pin is always located within the upper section 53 of the channel, while the lower half and the ejector pin retainer 63 are located in the middle section 52 of the channel. There is a gap between the upper section 61 of the ejector pin located in the middle section 52 of the channel and the middle section 52 of the channel. The gap is filled with a reset mechanism that allows the ejector pin retainer 63 to engage with the upper surface of the mounting plate 31. In this embodiment, the reset mechanism is a spring 64 with an inner diameter larger than that of the upper section 61 of the ejector pin. The spring 64 is sleeved within the middle section 52 of the channel. On the surface of the upper section 61 of the ejector pin, the upper end of the spring 64 abuts against the lower surface of the lower mold plate 33, and the lower end abuts against the upper surface of the ejector pin retainer 63. During injection molding, the spring 64 is in the released state. Under the action of gravity and the elastic force of the spring 64, the ejector pin 6 is in the lower position. The upper end surface of the ejector pin 6 fills the bottom surface of the groove of the lower mold plate 3 to form the mold cavity 7 and the sprue. After injection molding is completed and the plastic block has hardened, the ejector block 4 pushes the ejector pin 6 to the upper position simultaneously through the ejector plate 10, realizing the demolding of the plastic block. At this time, the spring 64 is in the compressed state. After demolding is completed, the ejector block 4 and the ejector plate 10 move down, and the lower end of the ejector pin 6 loses its supporting function and returns to the lower position under the action of the elastic force of the spring 64 and gravity. Of course, it is also possible to replace the spring with other reset mechanisms that can push the ejector pin to the lower position, such as using multiple thin springs supported between the lower surface of the lower mold plate and the ejector pin retainer.

[0027] The split-type pressure relief injection mold can meet the processing requirements of different plastic blocks by changing the main mold 2. The mounting plate 31 of the main mold 2 can be detachably installed on the demolding base 1 via the quick-clamping plate 14. Specifically, the mounting plate 31 can be wider than the connecting plate, so that its two sides protrude to form fixing wings 311. The demolding base 1 is provided with a mounting position that matches the mounting plate 31. The mounting plate 31 is embedded in the mounting position, and its upper surface is flush with the upper surface of the demolding base 1. The quick-clamping plate 14 can be horizontally slidably installed on the demolding base 1. The quick-clamping plate 14 can slide between two states: releasing the mounting plate 31 and clamping the mounting plate 31. In this embodiment, the quick-clamping plate 14 can be a structure of two small plates with a strip-shaped slot 15 in the center. The fixing screw 16 passes through the strip-shaped slot 15 from top to bottom and is locked on the demolding base 1. Alternatively, the quick-clamping plate can also be a structure of two small plates with through holes. The fixing screw passes through the through holes from top to bottom and is locked on the demolding base. When disassembling and assembling the main mold 2, first loosen the fixing screws 16, then push and slide the quick-clamping plate 14 with the strip slot 15 to both sides, so that the quick-clamping plate 14 leaves the upper surface of the mounting plate 31, allowing the main mold 2 to be removed. After replacing it with a new main mold 2, push and slide the quick-clamping plate 14 towards the center, so that the quick-clamping plate 14 presses against the upper surface of the mounting plate 31, and then tighten the fixing screws 16 to prevent the main mold 2 from loosening. If it is a small plate structure with through holes, first loosen the fixing screws, and then let the quick-clamping plate swing and slide around the through holes, allowing the quick-clamping plate to freely switch between the two states of releasing the mounting plate and clamping the mounting plate.

[0028] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any changes or modifications made in accordance with the claims and description of the present utility model should fall within the scope of the patent of the present utility model.

Claims

1. A split pressure relief injection mold, characterized by: The application relates to a demolding base and a main mold detachably mounted on the demolding base, wherein the main mold comprises a lower mold matched with the demolding base, the demolding base is provided with an upwardly movable demolding top block, the lower mold is provided with a needle channel penetrating the lower mold from top to bottom, and a demolding needle is mounted in the needle channel; the main mold is internally provided with a plurality of mold cavities, the glue inlet channels of the mold cavities are connected to a glue injection port, and the mold cavities are respectively connected with pressure relief buffer glue channels; the distance from the bottom surface of the mold cavity to the bottom surface of the lower mold is less than the length of the demolding needle.

2. The split pressure relief injection mold of claim 1, wherein: The lower mold comprises a mounting plate located at the bottom and a connecting piece fixedly mounted on the upper surface of the mounting plate, and a lower mold plate is mounted on the upper surface of the connecting piece; the needle channel comprises an upper channel section penetrating the lower mold plate, a middle channel section penetrating the connecting piece and a lower channel section penetrating the mounting plate from top to bottom, the inner diameter of the middle channel section is greater than the inner diameters of the upper channel section and the lower channel section, the demolding needle comprises an upper needle section and a lower needle section, the connecting part of the upper needle section and the lower needle section is expanded to form a needle snap ring, the outer diameter of the needle snap ring is equivalent to the inner diameter of the middle channel section and is located in the middle channel section, the outer diameter of the upper needle section is equivalent to the inner diameter of the upper channel section, and a reset mechanism for allowing the needle snap ring to be clamped on the upper surface of the mounting plate is filled in the gap between the upper needle section and the middle channel section.

3. The split pressure relief injection mold of claim 1, wherein: The mold cavity is a square mold cavity and is provided with a glue inlet and a glue outlet, the glue inlet and the glue outlet are arranged on two opposite diagonal points in the mold cavity respectively, the glue inlet is connected with the glue inlet channel, and the glue outlet is connected with the pressure relief buffer glue channel.

4. The split pressure relief injection mold of claim 3, wherein: The glue outlet is higher than the glue inlet.

5. The split pressure relief injection mold of claim 1, wherein: A needle channel is arranged below the center of the mold cavity, the convergence point of the glue inlet channel and the center of the pressure relief buffer glue channel.

6. The split pressure relief injection mold of claim 2, wherein: The mounting plate is detachably mounted on the demolding base through a quick compression plate, the demolding base is provided with a mounting position matched with the mounting plate, the quick compression plate is horizontally slidably mounted on the demolding base, and the quick compression plate is slidably switched between a state of releasing the mounting plate and a state of compressing the mounting plate.

7. The split pressure relief injection mold of claim 1, wherein: The demolding top block is arranged at the center of the demolding base, the upper end of the demolding top block is fixedly connected with a demolding top plate capable of lifting the demolding needle, a guide linear bearing is fixedly mounted on the bottom surface in the demolding base, and a guide sleeve is formed by protruding downward from the lower side surface of the demolding top plate and is sleeved with the guide linear bearing.

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