A hot runner inverted mold frame with precise demolding

Abstract

The utility model discloses a hot runner upside-down mould frame of accurate stripping, including upper fixed plate, upper hot runner plate, lower hot runner plate, upper needle plate, lower needle plate, upper cushion block, upper template, lower template, sliding block, shovel base and inclined guide pillar, upper fixed plate is connected injection molding machine, and is equipped with first glue inlet, and the bottom surface is sequentially connected upper hot runner plate and lower hot runner plate, and the both have upper runner and lower runner respectively and communicate with first glue inlet, and the left and right sides of lower hot runner plate are equipped with upper cushion block, and the bottom is connected upper template, and the upper cavity is formed by surrounding, and upper needle plate and lower needle plate are vertically movable in it, and lower needle plate has thimble, and upper template and lower template are fixed through positioning column and hole, and the upside-down cavity is formed by abutting, and upper template has second glue inlet and is connected lower runner, and upper template is equipped with stripping through -hole for thimble to pass through, and upper template bottom and lower template top have corresponding shovel base groove, and sliding block is horizontally arranged in lower template, and shovel base is embedded in the groove, and the oblique installation groove is arranged in it, and inclined guide pillar is obliquely arranged in the groove. The utility model makes the stripping of the product with lateral structure more accurate, and the product is more beautiful.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to a hot runner inverted mold base with precise demolding. Background Technology

[0002] In the field of injection molding, product appearance quality and demolding accuracy have a significant impact on production efficiency and product market competitiveness. With the increasing maturity of hot runner technology, the number of products manufactured using hot runner molds for injection molding is growing daily.

[0003] However, traditional hot runner molds typically place the gate at the top of the mold, while the ejector pins for demolding are located at the bottom. This structure results in noticeable gate marks on the surface of the product after injection molding, significantly affecting its appearance.

[0004] Although inverted mold bases with ejector pins and gates located on top of the mold have emerged to address the issue of injection marks on the product's surface, these mold bases are primarily designed for products without lateral structures. For products with lateral structures, their demolding accuracy still needs improvement. Utility Model Content

[0005] The purpose of this invention is to provide a hot runner inverted mold holder that ensures precise demolding, while ensuring that there are no glue injection points on the product's surface, and can improve the demolding accuracy for products with lateral structures.

[0006] To achieve the above objectives, the solution of this utility model is: a hot runner inverted mold frame with precise demolding, comprising an upper fixed plate, an upper hot runner plate, a lower hot runner plate, an upper needle plate, a lower needle plate, an upper pad, an upper template, a lower template, a slider, a shovel base, and inclined guide pillars;

[0007] The upper fixed plate is connected to the injection molding machine. The upper fixed plate has a first inlet. The bottom surface of the upper fixed plate is connected to an upper hot runner plate and a lower hot runner plate in sequence. The upper hot runner plate has an upper runner, and the lower hot runner plate has a lower runner. The first inlet is connected to the upper runner and the lower runner.

[0008] Upper pads are provided on the left and right sides of the bottom surface of the lower hot runner plate. The bottom surfaces of the two upper pads are connected to the upper template. The lower hot runner plate, the upper template and the two upper pads enclose and form an upper cavity. The upper needle plate and the lower needle plate are vertically movable in the upper cavity. The lower needle plate is located below the upper needle plate. Multiple ejector pins are vertically arranged on the bottom surface of the lower needle plate.

[0009] The upper template has a lower template at the bottom. The upper and lower templates are fixed together by positioning pins and positioning holes. The bottom surface of the upper template and the top surface of the lower template abut each other. The bottom surface of the upper template corresponds to the back of the product, and the top surface of the lower template corresponds to the outer surface of the product, so as to form an inverted cavity between the upper and lower templates. The upper template has a second injection port at the position corresponding to the top of the inverted cavity. The second injection port is connected to the lower flow channel through a nozzle. The upper template has a demolding through hole at the position corresponding to the ejector pin, which connects the upper cavity and the inverted cavity. The ejector pin passes through the demolding through hole.

[0010] The bottom surface of the upper template has multiple upper shovel base grooves, and the top surface of the lower template has multiple lower shovel base grooves at positions corresponding to the upper shovel base grooves. The slider is horizontally slidably set on the lower template. The upper and lower ends of the shovel base are respectively embedded in the upper shovel base grooves and the lower shovel base grooves. The shovel base has an installation groove opened at an angle, and the inclined guide post is inclinedly set in the installation groove.

[0011] In a preferred embodiment, a guide post is also included. The upper mold plate has a guide through hole, the guide post is set in the upper cavity, the upper end of the guide post is connected to the lower needle plate, and the lower end of the guide post passes through the guide through hole and abuts against the top surface of the lower mold plate when the mold is closed.

[0012] In a preferred embodiment, an upper support column is also included. The upper needle plate and the lower needle plate are provided with clearance through holes. The upper support column is disposed in the upper cavity and passes through the clearance through holes. The upper and lower ends of the upper support column are respectively connected to the lower hot runner plate and the upper template.

[0013] In a preferred embodiment, the lower template also includes a lower pad and a lower fixing plate. The lower pads are respectively provided on the left and right sides of the bottom surface of the lower template. The bottom surfaces of the two lower pads are connected to the lower fixing plate, and the lower template, the lower fixing plate and the two lower pads enclose and form a lower cavity.

[0014] In a preferred embodiment, the lower support column is further included, which is disposed in the lower cavity and its upper and lower ends are connected to the lower template and the lower fixing plate, respectively.

[0015] In a preferred embodiment, mounting holes are provided at the four corners of the upper fixing plate, the upper hot runner plate, the lower hot runner plate, and the upper template, as well as at the front and rear ends of the two upper pads. The upper fixing plate, the upper hot runner plate, the lower hot runner plate, the upper pads, and the upper template are sequentially fitted onto the upper part of the positioning column through the mounting holes.

[0016] Positioning holes are provided at the four corners of the lower template and the lower fixing plate, as well as at the front and rear ends of the two lower pads. The lower template, the lower pads, and the lower fixing plate are sequentially fitted onto the lower part of the positioning column through the positioning holes.

[0017] In a preferred embodiment, the system further includes a hydraulic cylinder, the output end of which is vertically arranged. The upper needle plate and the lower needle plate are connected to the output end of the hydraulic cylinder, and the hydraulic cylinder is used to drive the pins of the upper needle plate and the lower needle plate to move vertically.

[0018] After adopting the above solution, the beneficial effects of this utility model are as follows:

[0019] In this invention, during mold closing, the injection molding compound enters the inverted cavity through the first inlet, upper runner, lower runner, nozzle, and second inlet. The shovel base, in conjunction with the inclined guide post, drives the slider to simultaneously extend into the inverted cavity to injection mold products with lateral structures. Because the injection molding compound enters the inverted cavity from above the mold frame, there are no injection points on the surface of the injection-molded product located at the bottom of the mold frame, improving the appearance quality of the product. Furthermore, since the upper and lower needle plates are vertically movable in the upper cavity, and multiple ejector pins are installed on the bottom surface of the lower needle plate, during mold opening, the ejector pins of the upper and lower needle plates abut against the back of the product through the demolding through-hole, pushing the product away from the upper mold plate. During mold opening, the shovel base, in conjunction with the inclined guide post, can precisely drive the slider to simultaneously exit the inverted cavity, resulting in more uniform contact between the ejector pins and the product with lateral structures, more stable force, and effectively improved demolding accuracy. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the hot runner inverted mold frame in this embodiment of the utility model;

[0021] Figure 2 This is a partial exploded structural diagram of the hot runner inverted mold frame in an embodiment of this utility model;

[0022] Figure 3 This is a bottom view of the upper template in an embodiment of this utility model;

[0023] Figure 4 This is a schematic diagram showing the corresponding positional relationship between the slider, shovel base, inclined guide post, upper template, and lower template during mold closing in an embodiment of this utility model.

[0024] Label Explanation:

[0025] 1. Upper fixed plate; 2. Upper hot runner plate; 3. Lower hot runner plate; 4. Upper needle plate; 5. Lower needle plate; 6. Upper pad; 7. Upper cavity; 8. Upper template; 9. Inverted cavity; 10. Lower template; 11. Lower cavity; 12. Lower pad; 13. Lower fixed plate; 14. Slider; 15. Shovel base; 16. Angled guide post; 17. First sprue; 18. Upper runner; 19. Lower runner; 20. Ejector pin; 21. Positioning post; 22. Positioning hole; 23. Second sprue; 24. Nozzle; 25. Demolding through hole; 26. Upper sprue base groove; 27. Lower sprue base groove; 28. Mounting groove; 29. ​​Guide post; 30. Guide through hole; 31. Upper support post; 32. Clearance through hole; 33. Lower support post; 34. Mounting hole. Detailed Implementation

[0026] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0027] This embodiment provides a hot runner inverted mold base for precise demolding, such as... Figures 1 to 4 As shown, it includes an upper fixed plate 1, an upper hot runner plate 2, a lower hot runner plate 3, an upper needle plate 4, a lower needle plate 5, an upper pad block 6, an upper template 8, a lower template 10, a slider 14, a shovel base 15, and an inclined guide post 16.

[0028] The upper fixed plate 1 is connected to the injection molding machine. The upper fixed plate 1 has a first inlet 17. The bottom surface of the upper fixed plate 1 is connected to the upper hot runner plate 2 and the lower hot runner plate 3 in sequence. The upper hot runner plate 2 has an upper runner 18, and the lower hot runner plate 3 has a lower runner 19. The first inlet 17 is connected to the upper runner 18 and the lower runner 19.

[0029] Upper pads 6 are provided on the left and right sides of the bottom surface of the lower hot runner plate 3. The bottom surfaces of the two upper pads 6 are connected to the upper template 8. The lower hot runner plate 3, the upper template 8 and the two upper pads 6 enclose and form an upper cavity 7. The upper needle plate 4 and the lower needle plate 5 are vertically and movably arranged in the upper cavity 7. The lower needle plate 5 is located below the upper needle plate 4. Multiple ejector pins 20 are vertically arranged on the bottom surface of the lower needle plate 5.

[0030] The upper template 8 is provided with a lower template 10 at its lower part. The upper template 8 and the lower template 10 are fixed together by positioning pins 21 and positioning holes 22. The bottom surface of the upper template 8 and the top surface of the lower template 10 abut against each other. The bottom surface of the upper template 8 corresponds to the back of the product, and the top surface of the lower template 10 corresponds to the outer surface of the product, so as to form an inverted cavity 9 between the upper template 8 and the lower template 10. The upper template 8 has a second glue inlet 23 at the position corresponding to the top of the inverted cavity 9. The second glue inlet 23 is connected to the lower flow channel 19 through a nozzle 24. The upper template 8 has a demolding through hole 25 at the position corresponding to the ejector pin 20, which connects the upper cavity 7 and the inverted cavity 9. The ejector pin 20 passes through the demolding through hole 25.

[0031] The bottom surface of the upper template 8 has multiple upper shovel base grooves 26, and the top surface of the lower template 10 has multiple lower shovel base grooves 27 at positions corresponding to the upper shovel base grooves 26. The slider 14 is horizontally slidably mounted on the lower template 10. The upper and lower ends of the shovel base 15 are respectively embedded in the upper shovel base grooves 26 and the lower shovel base grooves 27. The shovel base 15 has an obliquely opened installation groove 28, and the oblique guide post 16 is obliquely mounted in the installation groove 28.

[0032] In this embodiment, the mold base adopts an inverted structure. After mold closing, the injection molding compound enters the inverted cavity 9 through the first inlet 17, upper runner 18, lower runner 19, nozzle 24, and second inlet 23. The spade base 15, in conjunction with the inclined guide post 16, drives the slider 14 to simultaneously extend into the inverted cavity 9 to injection mold products with lateral structures. Since the upper hot runner plate 2, lower hot runner plate 3, and nozzle 24 can all heat the injection molding compound, it remains in a molten state during flow. The injection molding compound enters the inverted cavity 9 from above the mold base, ensuring that the surface of the injection molded product located at the bottom of the mold base has no injection points, effectively improving the product's aesthetics.

[0033] Reference, 3 and Figure 4 By creating an upper shovel base groove 26 on the bottom surface of the upper mold plate 8 and a corresponding lower shovel base groove 27 on the top surface of the lower mold plate 10, the upper and lower ends of the shovel base 15 are respectively embedded therein. Simultaneously, the shovel base 15 has an obliquely angled mounting groove 28 and is equipped with an oblique guide post 16. During mold closing and opening, the shovel base 15 and the oblique guide post 16 cooperate to precisely drive the slider 14 to synchronously extend into or retract from the inverted cavity 9. This ensures that the slider 14 can accurately reach its position during injection molding to form the required lateral structure of the product. Furthermore, it makes the contact between the ejector pin 20 and the product more uniform and the force more stable, effectively improving the accuracy during demolding.

[0034] like Figure 1 and Figure 2 As shown, this embodiment also includes a guide post 29. The upper template 8 has a guide through hole 30. The guide post 29 is set in the upper cavity 7. The upper end of the guide post 29 is connected to the lower needle plate 5. The lower end of the guide post 29 passes through the guide through hole 30 and abuts against the top surface of the lower template 10 when the mold is closed.

[0035] In this embodiment, by setting guide pillars 29, the up-and-down movement of the upper needle plate 4, lower needle plate 5 and ejector pin 20 in the upper cavity 7 is more precise, ensuring the smooth demolding process.

[0036] like Figure 1 and Figure 2 As shown, this embodiment also includes an upper support column 31. The upper needle plate 4 and the lower needle plate 5 are provided with clearance through holes 32. The upper support column 31 is disposed in the upper cavity 7. The upper support column 31 passes through the clearance through holes 32. The upper and lower ends of the upper support column 31 are respectively connected to the lower hot runner plate 3 and the upper template 8.

[0037] In this embodiment, the upper support column 31 is connected to the lower hot runner plate 3 and the upper template 8 at its upper and lower ends, which can improve the stability of the overall structure and ensure the smooth progress of mold closing and injection molding.

[0038] like Figure 1 and Figure 2As shown, this embodiment also includes a lower pad 12 and a lower fixing plate 13. The lower pad 12 is provided on the left and right sides of the bottom surface of the lower template 10. The bottom surfaces of the two lower pads 12 are connected to the lower fixing plate 13. The lower template 10, the lower fixing plate 13 and the two lower pads 12 enclose each other to form a lower cavity 11.

[0039] In this embodiment, the lower pad block 12 and the lower fixing plate 13 provide stable support for the lower template 10 during mold closing, ensuring the smooth progress of the mold closing process.

[0040] like Figure 1 and Figure 2 As shown, this embodiment also includes a lower support column 33, which is disposed in the lower cavity 11, and the upper and lower ends of the lower support column 33 are respectively connected to the lower template 10 and the lower fixing plate 13.

[0041] In this embodiment, a lower support column 33 is provided in the lower cavity 11 formed by the lower template 10, the lower fixing plate 13 and the two lower pads 12, which can further improve the stability during mold closing and ensure the smooth progress of the mold closing process.

[0042] like Figure 1 and Figure 2 As shown, mounting holes 34 are provided at the four corners of the upper fixing plate 1, the upper hot runner plate 2, the lower hot runner plate 3 and the upper template 8, as well as at the front and rear ends of the two upper pads 6. The upper fixing plate 1, the upper hot runner plate 2, the lower hot runner plate 3, the upper pads 6 and the upper template 8 are sequentially fitted onto the upper part of the positioning post 21 through the mounting holes 34.

[0043] Positioning holes 22 are provided at the four corners of the lower template 10 and the lower fixing plate 13, as well as at the front and rear ends of the two lower pads 12. The lower template 10, the lower pads 12 and the lower fixing plate 13 are sequentially fitted onto the lower part of the positioning post 21 through the positioning holes 22.

[0044] This embodiment uses the positioning pin 21 in conjunction with the positioning hole 22 to ensure the accuracy of the mold closing and opening process, while also improving the loading and unloading efficiency of various components and ensuring the stability of the injection molding process.

[0045] Furthermore, this embodiment also includes a hydraulic cylinder (not shown in the figure), the output end of which is vertically arranged, and the upper needle plate 4 and the lower needle plate 5 are connected to the output end of the hydraulic cylinder. The hydraulic cylinder is used to drive the pin 20 of the upper needle plate 4 and the lower needle plate 5 to move vertically.

[0046] This embodiment uses a hydraulic cylinder to drive the upper needle plate 4 and the ejector pin 20 of the lower needle plate 5 to move vertically. It responds quickly and can provide a stable thrust, ensuring that the upper needle plate 4 and the lower needle plate 5 drive the ejector pin 20 to rise and fall evenly and smoothly during demolding, thereby improving the demolding efficiency of the product. The structure is simple.

[0047] The directional terms used in this specification are defined relative to the structures shown in the accompanying drawings. They are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0048] The above description is only a preferred embodiment of this utility model and is not intended to limit the design of this case. All equivalent changes made based on the key design of this case shall fall within the protection scope of this case.

Claims

1. A hot runner inverted mold base for precise demolding, characterized in that: It includes an upper fixed plate, an upper hot runner plate, a lower hot runner plate, an upper needle plate, a lower needle plate, an upper pad, an upper template, a lower template, a slider, a shovel base, and inclined guide posts; The upper fixed plate is connected to the injection molding machine. The upper fixed plate has a first inlet. The bottom surface of the upper fixed plate is connected to an upper hot runner plate and a lower hot runner plate in sequence. The upper hot runner plate has an upper runner, and the lower hot runner plate has a lower runner. The first inlet is connected to the upper runner and the lower runner. Upper pads are provided on the left and right sides of the bottom surface of the lower hot runner plate. The bottom surfaces of the two upper pads are connected to the upper template. The lower hot runner plate, the upper template and the two upper pads enclose and form an upper cavity. The upper needle plate and the lower needle plate are vertically movable in the upper cavity. The lower needle plate is located below the upper needle plate. Multiple ejector pins are vertically arranged on the bottom surface of the lower needle plate. The upper template has a lower template at the bottom. The upper and lower templates are fixed together by positioning pins and positioning holes. The bottom surface of the upper template and the top surface of the lower template abut each other. The bottom surface of the upper template corresponds to the back of the product, and the top surface of the lower template corresponds to the outer surface of the product, so as to form an inverted cavity between the upper and lower templates. The upper template has a second injection port at the position corresponding to the top of the inverted cavity. The second injection port is connected to the lower flow channel through a nozzle. The upper template has a demolding through hole at the position corresponding to the ejector pin, which connects the upper cavity and the inverted cavity. The ejector pin passes through the demolding through hole. The bottom surface of the upper template has multiple upper shovel base grooves, and the top surface of the lower template has multiple lower shovel base grooves at positions corresponding to the upper shovel base grooves. The slider is horizontally slidably set on the lower template. The upper and lower ends of the shovel base are respectively embedded in the upper shovel base grooves and the lower shovel base grooves. The shovel base has an installation groove opened at an angle, and the inclined guide post is inclinedly set in the installation groove.

2. The hot runner inverted mold base with precise demolding as described in claim 1, characterized in that: It also includes guide pillars. The upper mold plate has guide through holes. The guide pillars are set in the upper cavity. The upper end of the guide pillar is connected to the lower needle plate. The lower end of the guide pillar passes through the guide through holes and abuts against the top surface of the lower mold plate when the mold is closed.

3. The hot runner inverted mold base with precise demolding as described in claim 1, characterized in that: It also includes an upper support column. The upper needle plate and the lower needle plate are provided with clearance through holes. The upper support column is set in the upper cavity and passes through the clearance through holes. The upper and lower ends of the upper support column are respectively connected to the lower hot runner plate and the upper template.

4. The hot runner inverted mold base with precise demolding as described in claim 1, characterized in that: It also includes a lower pad and a lower fixing plate. The lower pad is provided on the left and right sides of the bottom surface of the lower template. The bottom surfaces of the two lower pads are connected to the lower fixing plate. The lower template, the lower fixing plate and the two lower pads enclose and form a lower cavity.

5. The hot runner inverted mold base with precise demolding as described in claim 4, characterized in that: It also includes a lower support column, which is disposed in the lower cavity, and the upper and lower ends of the lower support column are respectively connected to the lower template and the lower fixing plate.

6. The hot runner inverted mold base with precise demolding as described in claim 3, characterized in that: Mounting holes are provided at the four corners of the upper fixing plate, the upper hot runner plate, the lower hot runner plate, and the upper template, as well as at the front and rear ends of the two upper pads. The upper fixing plate, the upper hot runner plate, the lower hot runner plate, the upper pads, and the upper template are sequentially fitted onto the upper part of the positioning column through the mounting holes. Positioning holes are provided at the four corners of the lower template and the lower fixing plate, as well as at the front and rear ends of the two lower pads. The lower template, the lower pads, and the lower fixing plate are sequentially fitted onto the lower part of the positioning column through the positioning holes.

7. The hot runner inverted mold base with precise demolding as described in claim 1, characterized in that: It also includes a hydraulic cylinder, the output end of which is vertically arranged. The upper needle plate and the lower needle plate are connected to the output end of the hydraulic cylinder. The hydraulic cylinder is used to drive the pins of the upper needle plate and the lower needle plate to move vertically.

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