Split type high-precision injection mold for plastic product processing

Abstract

The application discloses a split high-precision injection mold for plastic product processing, which comprises an upper split mold, a lower split mold, a shoulder adjusting block and a liquid injection pipe. The shoulder adjusting block is inserted into the upper injection cavity for installation, the bottom end surface of the shoulder adjusting block is used as a shaped shoulder, and the shoulder adjusting block is connected with an electric source. The shoulder adjusting block made of graphite material can be quickly electrified and heated, which helps to heat and inject plastic liquid and improve the flowability of the plastic liquid. Meanwhile, the shaped shoulder position formed by the bottom end surface of the shoulder adjusting block can continuously conduct heat and strengthen the plastic liquid at the position, thereby improving the poor flowability of the plastic liquid at the shaped shoulder.

Description

Technical Field

[0001] This invention relates to the field of split injection mold technology, specifically to a split high-precision injection mold for processing plastic products. Background Technology

[0002] Injection molds are tools used to produce plastic products; they are also high-precision tools that give plastic products a complete structure and precise dimensions. Specifically, they refer to the process of injecting molten plastic liquid into a mold cavity, which is then cooled and solidified to obtain the molded product.

[0003] However, during the injection molding production of plastic products with variable diameter structures or altered cross-sectional widths, the shoulder cavity at the upper and lower mating surfaces changes the flowability of the injection liquid. This can easily lead to defects such as material shortages or pinholes in the molded plastic products due to unstable flowability of the injection liquid in the shoulder cavity, affecting the quality of high-precision plastic products.

[0004] In existing technologies, such as Figure 1 As shown, when the upper split mold 1 is moved to the lower split mold 2 by the upgrading connecting rod 4 for injection molding production, the lower split mold 2 is fixedly installed on the base plate 3. The upper split mold 1 has a narrow injection cavity 1a, and the lower split mold 2 has a lower injection expansion cavity 2a. The narrow injection cavity 1a and the lower injection expansion cavity 2a form the injection cavity of the plastic product. Molten plastic is injected through the injection channel 1c connected to the narrow injection cavity 1a. The mating surface between the bottom end of the narrow injection cavity 1a and the top end of the lower injection expansion cavity 2a forms a shaping shoulder. 1b. When the injection molding liquid flows from the lower injection expansion cavity 2a to the injection narrow cavity 1a, the flow of the injection molding liquid is altered by the obstruction of the shaping shoulder 1b, resulting in poor upward flow of the injection molding liquid. This can easily cause defects such as material shortage or pinholes in the plastic products shaped by the shaping shoulder 1b. In addition, the injection molding liquid flowing from the lower injection expansion cavity 2a to the injection narrow cavity 1a impacts the shaping shoulder 1b for a long time, which can easily cause increased impact wear on the shaping shoulder 1b, thereby increasing the shoulder error of the plastic product molding and affecting the accuracy of the shoulder molding of the plastic product. Summary of the Invention

[0005] The purpose of this invention is to provide a split-type high-precision injection mold for processing plastic products, which solves the problem of poor fluidity of injection liquid caused by the shaping shoulder in the prior art.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A split-type high-precision injection mold for processing plastic products includes:

[0008] The upper split mold has a stepped through hole, the upper part of which is a wide-diameter opening groove and the lower part is a narrow-diameter upper injection cavity.

[0009] The lower mold has a lower injection cavity, which is set to the same diameter as the upper injection cavity.

[0010] A shoulder adjustment block is inserted into the upper injection cavity, and the top of the shoulder adjustment block extends into the opening groove. An insulating disk is fixedly connected to the top of the shoulder adjustment block, and the insulating disk is positioned and connected to the inner bottom wall of the opening groove through a height adjustment component.

[0011] The injection tube is inserted and connected to the insulating disc and communicates with the inner cavity of the upper injection cavity;

[0012] The hollow inner cavity of the shoulder adjustment block and the lower injection expansion cavity form a molded injection cavity. A bent biting part is cut out on the side wall of the shoulder adjustment block. An insulating sealing layer is provided on the biting surface of the biting part. The two sides of the biting part are electrically connected to a positive electrode rod and a negative electrode rod, respectively. The positive electrode rod and the negative electrode rod pass through the insulating disk and extend upward.

[0013] As a further aspect of the present invention: the height adjustment assembly includes an adjustment washer ring and screw rods. The adjustment washer ring is used to support the insulating disk. A plurality of screw rods are evenly distributed on the insulating disk. The screw rods pass through the adjustment washer ring and are threadedly connected to the upper split mold.

[0014] As a further aspect of the present invention, vibration mechanisms are provided on both sides of the joint surface of the upper and lower split molds.

[0015] As a further embodiment of the present invention: the vibration mechanism includes a T-shaped knocking block, a linkage abutment block, a return spring, an eccentric disc, and a drive motor. The T-shaped knocking block is slidably connected to a positioning plate, and the tail end of the T-shaped knocking block is fixedly connected to the linkage abutment block. A return spring is clamped between the linkage abutment block and the positioning plate. The linkage abutment block abuts against the eccentric disc, and the eccentric disc is sleeved on the output end of the drive motor.

[0016] As a further embodiment of the present invention: the drive motor is fixedly mounted on the second positioning plate, and the second positioning plate and the first positioning plate are respectively vertically connected to the base plate.

[0017] As a further aspect of the present invention: the shoulder adjustment block is provided with an upper cooling ring channel, one end of the cooling pipe extends into the upper cooling ring channel, and the cooling pipe is inserted and connected to the insulating disk.

[0018] As a further aspect of the present invention: the lower split mold is provided with a lower cooling ring channel that wraps around the lower injection cavity, and the two sides of the lower cooling ring channel are respectively connected to a circulation inlet pipe and a circulation outlet pipe, the circulation inlet pipe and the circulation outlet pipe respectively penetrate the lower split mold and extend downward.

[0019] As a further aspect of the present invention, the inner and outer sides of the biting surface of the biting part are fixedly connected by a plurality of evenly distributed bolts.

[0020] As a further aspect of the present invention: lifting linkages are symmetrically provided on the top of the upper split mold and on both sides of the opening slot.

[0021] As a further aspect of the present invention: the lower split mold is fixedly mounted on the base plate.

[0022] The beneficial effects of this invention are:

[0023] (1) By inserting the shoulder adjustment block into the upper injection cavity, the bottom end face of the shoulder adjustment block is used as the shaping shoulder, and the shoulder adjustment block is connected to the power supply. The shoulder adjustment block made of graphite material can be quickly energized and heated, which helps to heat the injected plastic liquid and improve the flow of the injected plastic liquid. At the same time, the shaping shoulder position formed by the bottom end face of the shoulder adjustment block continuously conducts heat to strengthen the plastic liquid at this position, and improves the problem of poor flow of plastic liquid in the shaping shoulder.

[0024] (2) The support height of the insulating disc can be adjusted by the height adjustment component so that the height position of the shoulder adjustment block inserted into the upper injection cavity can be changed. The bottom end face of the shoulder adjustment block can be adjusted as the height position of the shaping shoulder, so as to be suitable for molding different shaping shoulder height positions of plastic products. In addition, as the flowing injection liquid impacts the bottom end face of the shoulder adjustment block for a long time, in order to avoid the error caused by the impact wear of the bottom end face of the shoulder adjustment block, the depth position of the shoulder adjustment block inserted into the upper injection cavity is adjusted to compensate for wear error.

[0025] (3) Vibration mechanisms are set on both sides of the joint surface of the upper and lower split molds respectively. The vibration mechanisms facilitate the repeated tapping of the upper and lower split molds in the mold-closed state. During the injection of plastic liquid, the injection mold has an overall vibration effect, so that the plastic liquid can be better evenly distributed and filled in the mold-closed injection cavity under repeated tapping vibration, further improving the fluidity of the injected plastic liquid, so that the final shaped plastic product in the injection mold can avoid defects such as material shortage or sand hole. Attached Figure Description

[0026] The invention will now be further described with reference to the accompanying drawings.

[0027] Figure 1 This is a schematic diagram of the structure of a split-type high-precision injection mold for processing plastic products in the existing technology;

[0028] Figure 2 This is a schematic diagram of the structure of the split-type high-precision injection mold for processing plastic products according to the present invention;

[0029] Figure 3 This is a schematic diagram of the cross-section of the upper split mold in this invention;

[0030] Figure 4 This is a schematic diagram of the lower split mold cross-section in this invention;

[0031] Figure 5 This is a schematic diagram of the shoulder adjustment block structure in this invention;

[0032] Figure 6 This is a bottom view of the shoulder adjustment block in this invention;

[0033] Figure 7 This is a schematic cross-sectional view of the shoulder adjustment block in this invention;

[0034] Figure 8 This is a schematic diagram of the installation of the vibration mechanism in this invention.

[0035] In the diagram: 1. Upper split mold; 1a. Narrow injection cavity; 1b. Shaping shoulder; 1c. Injection channel; 1d. Upper injection cavity; 1e. Opening groove; 2. Lower split mold; 2a. Lower injection cavity; 3. Base plate; 4. Lifting linkage; 5. Shoulder adjusting block; 50. Engagement part; 51. Upper cooling ring channel

[0036] 6. Insulating disc; 7. Liquid injection pipe; 8. Adjusting washer ring; 9. Screw rod; 10. Positive terminal rod; 11. Negative terminal rod; 12. Bolt; 13. Insulating sealing layer; 14. Cooling pipe; 15. Lower cooling ring channel; 16. Circulation inlet pipe; 17. Circulation outlet pipe; 18. Vibration mechanism; 19. T-shaped knocking block; 20. Positioning plate one; 21. Linkage stop block; 22. Return spring; 23. Eccentric disc; 24. Drive motor; 25. Positioning plate two. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention; in the description of this invention, "a plurality of" or "several" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0039] Please see Figure 1 As shown, the present invention is a split-type high-precision injection mold for processing plastic products, including an upper split mold 1, a lower split mold 2, a shoulder adjustment block 5, and an injection pipe 7. The shoulder adjustment block 5 is installed separately in the upper split mold 1. The shoulder adjustment block 5 can improve the problem of poor flowability of injection liquid caused by the shaping shoulder 1b.

[0040] Among them, such as Figure 2 As shown, the upper split mold 1 has a stepped through hole. The upper part of the stepped through hole is a wide-diameter opening groove 1e, and the lower part is a narrow-diameter upper injection cavity 1d, which facilitates fixing the top of the shoulder adjustment block 5 in the opening groove 1e. The upper injection cavity 1d facilitates the insertion and assembly of the shoulder adjustment block 5.

[0041] like Figure 3 As shown, the lower mold 2 has a lower injection cavity 2a. The lower injection cavity 2a has the same diameter as the upper injection cavity 1d. The lower injection cavity 2a and the upper injection cavity 1d are aligned vertically when the mold is closed, so as to avoid the formation of a shaping shoulder 1b at the joint surface of the upper injection cavity 1d and the lower injection cavity 2a.

[0042] When assembling shoulder adjustment block 5, such as Figure 1 As shown, the shoulder adjustment block 5 is inserted into the upper injection cavity 1d. The bottom end face of the shoulder adjustment block 5 serves as the shaping shoulder 1b, and the top of the shoulder adjustment block 5 extends into the opening groove 1e. An insulating disk 6 is fixedly connected to the top of the shoulder adjustment block 5. The insulating disk 6 is positioned and connected to the inner bottom wall of the opening groove 1e through a height adjustment component. The height adjustment component can adjust the support height of the insulating disk 6, thereby changing the height position of the shoulder adjustment block 5 extending into the upper injection cavity 1d. This allows for adjustment of the bottom end face of the shoulder adjustment block 5 as the height position of the shaping shoulder 1b, making it suitable for molding different height positions of the shaping shoulder 1b in plastic products. In addition, as the flowing injection liquid impacts the bottom end face of the shoulder adjustment block 5 for a long time, to avoid the error caused by the impact and wear of the bottom end face of the shoulder adjustment block 5, the depth position of the shoulder adjustment block 5 extending into the upper injection cavity 1d is adjusted to compensate for wear error.

[0043] like Figure 1 As shown, the injection tube 7 is inserted and connected to the insulating plate 6 and communicates with the inner cavity of the upper injection cavity 1d, so as to facilitate the injection of plastic liquid into the upper injection cavity 1d through the injection tube 7.

[0044] When injecting molten plastic into injection tube 7, such as Figure 1 and Figure 5-6As shown, the hollow inner cavity of the shoulder adjusting block 5 and the lower injection expansion cavity 2a form a molded injection cavity, allowing the molten plastic to fill the injection cavity and shape the product. A bent, interlocking portion 50 is cut out of the side wall of the shoulder adjusting block 5. An insulating sealing layer 13 is provided on the interlocking surface of the interlocking portion 50. Positive electrode rod 10 and negative electrode rod 11 are electrically connected to both sides of the interlocking portion 50, respectively. The positive electrode rod 10 and negative electrode rod 11 pass through the insulating disc 6 and extend upwards, respectively. They are connected to the shoulder adjusting block 5 via electrical connection. The segment 5 can be made of graphite, which has good electrical and thermal conductivity, and a low coefficient of linear expansion, resulting in excellent thermal stability and resistance to heating shock. Its melting point is higher than the injection temperature of the molten plastic. Therefore, the shoulder adjustment block 5 made of graphite can be quickly energized and heated, which helps to heat the molten plastic and improve its flowability. At the same time, the shaping shoulder 1b formed on the bottom surface of the shoulder adjustment block 5 continuously conducts heat to strengthen the molten plastic at this position, thus improving the problem of poor flow of molten plastic at the shaping shoulder 1b.

[0045] In this embodiment, the shoulder adjustment block 5 extends into the upper injection cavity 1d of the upper split mold 1. During the electrical conduction and heating process, it can not only heat and improve the fluidity of the molten plastic, but also allow the molten plastic to reach the shaping shoulder 1b position formed by the bottom end face of the shoulder adjustment block 5. Air in the molded injection cavity tends to accumulate at the shaping shoulder 1b position. By installing the shoulder adjustment block 5 into the upper injection cavity 1d of the upper split mold 1, it is easy to discharge the air accumulated at the shaping shoulder 1b position from the gap between the shoulder adjustment block 5 and the upper injection cavity 1d, thus avoiding defects such as material shortage or pinholes in the shaped plastic product at the shaping shoulder 1b position.

[0046] In this embodiment, as Figure 1 As shown, the height adjustment assembly includes an adjusting pad ring 8 and screw rods 9. The adjusting pad ring 8 is used to support the insulating disk 6. Multiple screw rods 9 are evenly distributed on the insulating disk 6. The screw rods 9 pass through the adjusting pad ring 8 and are threadedly connected to the upper split mold 1. When adjusting the depth of the shoulder adjusting block 5 extending into the upper injection cavity 1d, the adjustment is achieved by adjusting the support height of the adjusting pad ring 8. The adjustment is simple and convenient, improves accuracy, and avoids the need to correct the molded plastic product. At the same time, by adjusting the support height of the adjusting pad ring 8, the wear compensation of the bottom end face of the shoulder adjusting block 5 can be performed.

[0047] In this embodiment, as Figure 1As shown, vibration mechanisms 18 are provided on both sides of the mating surface of the upper split mold 1 and the lower split mold 2. The vibration mechanisms 18 facilitate the repeated tapping of the upper split mold 1 and the lower split mold 2 in the mold-closed state. During the injection of molten plastic, the injection mold has an overall vibration effect, so that the molten plastic can be better and more evenly distributed and filled in the mold-closed injection cavity under the repeated tapping vibration, further improving the fluidity of the injected molten plastic, so that the final shaped shoulder 1b of the plastic product in the injection mold can avoid defects such as material shortage or pinholes.

[0048] Furthermore, such as Figure 8 As shown, the vibration mechanism 18 includes a T-shaped knocking block 19, a linkage block 21, a return spring 22, an eccentric disc 23, and a drive motor 24. The T-shaped knocking block 19 is slidably connected to the positioning plate 20, and the linkage block 21 is fixedly connected to the tail end of the T-shaped knocking block 19. The return spring 22 is clamped between the linkage block 21 and the positioning plate 20. The linkage block 21 abuts against the eccentric disc 23, and the eccentric disc 23 is sleeved on the output end of the drive motor 24. The drive motor 24 is fixedly mounted on the positioning plate 2. On the 25, positioning plate 25 and positioning plate 20 are vertically connected to the base plate 3. The output end eccentric disk 23 is rotated by the drive motor 24, so that the T-shaped knocking block 19, which is in contact with the eccentric disk 23, slides back and forth along the positioning plate 20. During this process, the return spring 22 has elastic return contact with the linkage block 21, so that the rotation of the eccentric disk 23 can continuously act on the T-shaped knocking block 19, so that the T-shaped knocking block 19 repeatedly knocks the injection mold, thereby knocking the vibrating injected plastic liquid.

[0049] In this embodiment, as Figure 7 As shown, the shoulder adjustment block 5 is provided with an upper cooling ring channel 51. One end of the cooling pipe 14 extends into the upper cooling ring channel 51. The cooling pipe 14 is inserted and connected to the insulating disk 6. When the plastic liquid is injected for cooling and shaping, it is convenient to input the coolant into the upper cooling ring channel 51 through the cooling pipe 14 so that the shoulder adjustment block 5 can cool and shrink the outer wall of the shaped plastic product for shaping, which is convenient for quick demolding.

[0050] In this embodiment, as Figure 4 As shown, the lower split mold 2 is provided with a lower cooling ring channel 15 that surrounds the lower injection cavity 2a. The two sides of the lower cooling ring channel 15 are respectively connected to the circulation inlet pipe 16 and the circulation outlet pipe 17. The circulation inlet pipe 16 and the circulation outlet pipe 17 pass through the lower split mold 2 and extend downward. Coolant is circulated into the lower cooling ring channel 15 so that the lower split mold 2 cools and shrinks the outer wall of the molded plastic product to facilitate rapid demolding.

[0051] In this embodiment, as Figure 5As shown, the inner and outer sides of the biting surface of the biting part 50 are fixedly connected by a plurality of evenly distributed bolts 12, so that the biting part 50 of the shoulder adjustment block 5 is securely fastened by the bolts 12, so that the inner cavity wall of the shoulder adjustment block 5 completely forms the cavity wall of the molded plastic product.

[0052] In this embodiment, as Figure 1 As shown, lifting rods 4 are symmetrically provided on the top of the upper split mold 1 and on both sides of the opening slot 1e, so as to facilitate the upper split mold 1 and the lower split mold 2 to be closed or demolded by the lifting rods 4.

[0053] In this embodiment, as Figure 1 As shown, the lower split mold 2 is fixedly installed on the base plate 3, and the lower split mold 2 is installed stably.

[0054] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A split-type high-precision injection mold for processing plastic products, characterized in that, include: The upper split mold (1) has a stepped through hole, the upper part of which is a wide-diameter opening groove (1e) and the lower part is a narrow-diameter upper injection cavity (1d). The lower split mold (2) has a lower injection cavity (2a) which is set to the same size as the upper injection cavity (1d); A shoulder adjustment block (5) is inserted into the upper injection cavity (1d), and the top of the shoulder adjustment block (5) extends into the opening groove (1e). An insulating disk (6) is fixedly connected to the top of the shoulder adjustment block (5), and the insulating disk (6) is positioned and connected to the inner bottom wall of the opening groove (1e) through a height adjustment assembly. The injection tube (7) is inserted and connected to the insulating disc (6) and communicates with the inner cavity of the upper injection cavity (1d); The hollow inner cavity of the shoulder adjustment block (5) and the lower injection expansion cavity (2a) form a molded injection cavity. A bent biting part (50) is cut out on the side wall of the shoulder adjustment block (5). An insulating sealing layer (13) is provided on the biting surface of the biting part (50). The two sides of the biting part (50) are electrically connected to the positive electrode rod (10) and the negative electrode rod (11). The positive electrode rod (10) and the negative electrode rod (11) pass through the insulating disk (6) and extend upward. The shoulder adjustment block (5) is provided with an upper cooling ring channel (51), and one end of the cooling pipe (14) extends into the upper cooling ring channel (51). The cooling pipe (14) is inserted and connected to the insulating disk (6).

2. The split-type high-precision injection mold for processing plastic products according to claim 1, characterized in that, The height adjustment assembly includes an adjustment pad ring (8) and screw rods (9). The adjustment pad ring (8) is used to support the insulating disk (6). Multiple screw rods (9) are evenly distributed on the insulating disk (6). The screw rods (9) pass through the adjustment pad ring (8) and are threadedly connected to the upper split mold (1).

3. The split-type high-precision injection mold for processing plastic products according to claim 1, characterized in that, Vibration mechanisms (18) are provided on both sides of the joint surface of the upper split mold (1) and the lower split mold (2).

4. A split-type high-precision injection mold for processing plastic products according to claim 3, characterized in that, The vibration mechanism (18) includes a T-shaped knocking block (19), a linkage block (21), a return spring (22), an eccentric disc (23), and a drive motor (24). The T-shaped knocking block (19) is slidably connected to the positioning plate (20), and the tail end of the T-shaped knocking block (19) is fixedly connected to the linkage block (21). The linkage block (21) and the positioning plate (20) are clamped together with the return spring (22). The linkage block (21) abuts against the eccentric disc (23), and the eccentric disc (23) is sleeved on the output end of the drive motor (24).

5. A split-type high-precision injection mold for processing plastic products according to claim 4, characterized in that, The drive motor (24) is fixedly installed on the second positioning plate (25), and the second positioning plate (25) and the first positioning plate (20) are respectively vertically connected to the base plate (3).

6. A split-type high-precision injection mold for processing plastic products according to claim 1, characterized in that, The lower split mold (2) is provided with a lower cooling ring channel (15) that wraps around the lower injection cavity (2a). The two sides of the lower cooling ring channel (15) are respectively connected to a circulation inlet pipe (16) and a circulation outlet pipe (17). The circulation inlet pipe (16) and the circulation outlet pipe (17) pass through the lower split mold (2) and extend downward.

7. A split-type high-precision injection mold for processing plastic products according to claim 1, characterized in that, The inner and outer sides of the biting surface of the biting part (50) are fixedly connected by a plurality of evenly distributed bolts (12).

8. A split-type high-precision injection mold for processing plastic products according to claim 1, characterized in that, Lifting rods (4) are symmetrically provided on the top of the upper split mold (1) and on both sides of the opening slot (1e).

9. A split-type high-precision injection mold for processing plastic products according to claim 1, characterized in that, The lower split mold (2) is fixedly installed on the base plate (3).

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