Plastic forming mold suitable for complex parts

Abstract

The invention relates to the field of forming molds, and discloses a plastic forming mold suitable for complex parts, the plastic forming mold comprises a front mold and a rear mold, the front mold is provided with a sliding block body and an embedded part, the rear mold is provided with a base and a top cover, the base is fixedly connected with the rear mold, and a center shaft used for supporting the top cover is fixedly mounted in the base; a forming assembly used for internal thread forming is jointly arranged between the base and the top cover, and an adjusting assembly used for moving the forming assembly is jointly arranged among the base, the top cover and the center shaft. Through cooperation of the base, the top cover, the forming assembly, the adjusting assembly and the like, the forming assembly can be driven to contract inwards to be separated from an internal thread of a plastic part, then rapid demolding of the plastic part is facilitated, contact with the internal thread can be avoided, and the overall quality of the interior of the plastic part can be effectively guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of molding dies, and in particular to a plastic molding die suitable for complex parts. Background Art

[0002] Automobile ventilation pipe joints are plastic accessories frequently used in automobiles. They are plastic parts with threads both inside and outside. When demolding the internal threads of the existing molding mold, the tubular thread core built into the mold is rotated. The outer wall of the tubular thread core is provided with external threads. The rotation of the tubular thread core will generate a force in the direction of demolding the plastic part, thereby realizing the demolding of the internal threads of the plastic part.

[0003] For example, Chinese patent publication number CN118386487A discloses a processing and forming mold for automobile plastic accessories, which includes a front mold and a rear mold. The front mold is provided with an embedded part and an injection port. The front mold is connected to two slider bodies in a transmission manner. The two slider bodies are connected to form an injection hole. A hollow shaft is rotatably provided on the rear mold, and a core shaft is rotatably inserted in the hollow shaft. The outer peripheral surface of the core shaft is provided with a mounting groove, and a top pressure piece is provided in the mounting groove. The core shaft is provided with a slide groove, and a moving block is provided in the slide groove. A driving mechanism is provided inside the core shaft, and the driving mechanism can drive the moving block to move along the slide groove; during injection molding, the moving block extends from the slide groove and cooperates with the top pressure piece to stop, so that the top pressure piece shrinks into the installation groove; during demoulding, the driving mechanism controls the moving block to shrink into the slide groove, so that the top pressure piece pops out from the installation groove and presses the plastic part, so that the relative friction between the plastic part and the core shaft is reduced, and damage to the plastic part is avoided, and at the same time, the hollow shaft and the plastic part can be separated more smoothly.

[0004] This application demoulds the plastic part by rotating the hollow shaft while the plastic part does not rotate. However, due to the setting of the internal thread, the hollow shaft needs to rotate many times to complete the demoulding, and the arc plate is in a pop-up state to press the inner wall of the plastic part. In order to ensure the pressing strength, it will cause damage to the inner wall and internal thread of the plastic part, and there are certain limitations in use.

[0005] Therefore, it is necessary to provide a plastic molding mold suitable for complex parts to solve the above technical problems. Summary of the invention

[0006] The object of the present invention is to provide a plastic molding mold suitable for complex parts to solve the problems raised in the above background technology.

[0007] To achieve the above purpose, a plastic molding mold is designed, which can realize demoulding without touching the internal thread and avoid damage to the inner wall and internal thread of the plastic part, and can be effectively applied to complex plastic parts.

[0008] Based on the above ideas, the present invention provides the following technical solutions: a plastic molding mold suitable for complex parts, including a front mold and a rear mold, the front mold is provided with a slider body and an embedded part, the rear mold is provided with a base and a top cover, the base is fixedly connected to the rear mold and a central axis for supporting the top cover is fixedly installed inside the base, a molding component for internal thread molding is commonly provided between the base and the top cover, and an adjustment component for moving the molding component is commonly provided between the base, the top cover and the central axis; starting the adjustment component can drive the molding component to shrink inward, so that the molding component is separated from the internal thread of the plastic part.

[0009] As a further solution of the present invention: the molding component includes a plurality of first thread segments and a plurality of second thread segments, the plurality of first thread segments and the plurality of second thread segments are in a ring array and are arranged alternately, and the first thread segments are fitted with adjacent second thread segments; the inner walls of the first thread segments and the second thread segments are fixedly installed with partitions driven by the adjustment component, and the top and bottom of the partitions are respectively slidably matched with the top cover and the base.

[0010] As a further solution of the present invention: the outer surface of the top cover is provided with a groove for molding plastic parts, the top cover is formed with a wall thickness to provide for the opening of the groove and for the sliding of the top surface of the partition bar, and a boss is formed inwardly on the base surface for the sliding of the bottom surface of the partition bar.

[0011] As a further solution of the present invention: the surface where the first thread segment and the second thread segment fit together is set as a slope, and the slope allows the first thread segment to shrink inward first, and then the second thread segment shrinks inward.

[0012] As a further solution of the present invention: the adjustment assembly includes a cylinder fixedly installed in the base and two circular rings movably mounted outside the central axis, a spring is commonly mounted between the upper circular ring and the top cover, the output shaft of the cylinder is fixedly connected to the lower circular ring, and a lifting rod is fixedly installed on the top surface of the lower circular ring, connecting rods are rotatably installed on the outer surfaces of the upper circular ring and the lower circular ring, and the ends of the connecting rods are rotatably matched with the spacer bars.

[0013] As a further solution of the present invention: the connecting rod on the upper circular ring is rotationally matched with the spacer on the second threaded segment, and the connecting rod on the lower circular ring is rotationally matched with the spacer on the first threaded segment.

[0014] As a further solution of the present invention: the outer surface of the central shaft is formed with a table surface for supporting the upper circular ring, and the spring makes the upper circular ring have a tendency to move downward, so that the bottom surface of the upper circular ring can be against the table surface.

[0015] As a further solution of the present invention: when the lower circular ring drives the first thread segment to contract through the lower connecting rod, the lifting rod can contact the upper circular ring and push it up, thereby causing the second thread segment to contract inward again through the upper connecting rod.

[0016] As a further solution of the present invention: a plurality of support rods are slidably mounted on the surface of the top cover, and the support rods are arranged in a circular array based on the top cover; a bracket corresponding to the support rods is fixedly mounted on the surface of the upper circular ring, and the support rods can be driven to rise when the brackets contact with the support rods.

[0017] As a further solution of the present invention: the support rod slides up and down based on the top cover, and the top surface of the support rod is flush with the top surface of the top cover.

[0018] Compared with the prior art, the beneficial effects of the present invention are: through the cooperation between the base, the top cover, the molding assembly and the adjustment assembly, the molding assembly can be driven to shrink inward and separate from the internal thread of the plastic part, thereby facilitating the rapid demoulding of the plastic part and avoiding contact with the internal thread, and effectively ensuring the overall quality of the inside of the plastic part. When demoulding, it is only necessary to translate the plastic part along the top cover, without continuously rotating the plastic part and the core, so that the demoulding method becomes simpler and the demoulding speed is also improved; at the same time, there is no need to install a driving part outside the rear mold to drive the core to rotate, which can ensure the sealing effect of the front mold and the rear mold, and is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a three-dimensional diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the base and top cover structure of the present invention; Figure 3 It is a schematic diagram of the internal structure of the base of the present invention; Figure 4 It is a schematic diagram of the structure of the first thread segment and the second thread segment of the present invention; Figure 5 It is a schematic diagram of the slope and partition structure of the present invention; Figure 6 It is a schematic diagram of the top cover and support rod structure of the present invention; Figure 7 for Figure 6 A magnified view of the structure at center; Figure 8 It is a schematic diagram of the support structure of the present invention; Fig. 9 It is a schematic diagram of the central axis and cylindrical structure of the present invention; Fig.10 for Fig. 9 Enlarged view of the structure at point B in the middle.

[0020] In the figure: 1, rear mold; 2, front mold; 3, base; 4, top cover; 5, molding assembly; 6, center axis; 7, adjustment assembly; 8, support rod; 9, moving assembly; 301, boss; 501, first thread segment; 502, second thread segment; 503, spacer; 504, slope; 701, ring; 702, cylinder; 703, lifting rod; 704, spring; 705, connecting rod; 706, bracket; 901, sliding rod; 902, pad; 903, spiral groove; 904, telescopic rod; 905, cylinder. DETAILED DESCRIPTION

[0021] Embodiment 1: See also Figures 1 to 5 The embodiment of the present invention provides a plastic molding mold suitable for complex parts, which is mainly used to realize the rapid demoulding of the internal thread of the plastic part and reduce the internal damage. The mold includes a front mold 2 and a rear mold 1. The rear mold 1 is provided with a core for molding the plastic part, and the front mold 2 is provided with a slider body and an insert (not shown in the figure) for molding the plastic part. When the front mold 2 and the rear mold 1 are closed, the core can realize the molding of the internal thread and the rib plate of the plastic part, and the slider body and the insert can realize the molding of the opening and the partition platform of the plastic part.

[0022] In this embodiment, the rapid demoulding of the internal thread of the plastic part is mainly aimed at, and the demoulding of the slider body and the insert from the plastic part is not carried out. Among them, the front mold 2, the rear mold 1, the slider body, the insert, and the demoulding of the slider body and the insert are all existing mature technologies, which will not be described in detail here.

[0023] Furthermore, the core includes a base 3 and a top cover 4, and the base 3 is fixedly installed on the rear mold 1, a central axis 6 for supporting the top cover 4 is fixedly installed inside the base 3, a groove for rib plate molding is opened on the top cover 4, a molding component 5 for internal thread molding is commonly provided between the base 3 and the top cover 4, and an adjustment component 7 for moving the molding component 5 is commonly provided between the base 3, the top cover 4 and the central axis 6.

[0024] In the normal state, the molding component 5 is in the extended state to realize the corresponding molding of the internal thread. At this time, the molding component 5 protrudes relative to the outer surface of the top cover 4, and a relative seal is formed between the molding component 5 and the base 3 and the top cover 4. When the plastic part is molded, the adjustment component 7 is started to drive the molding component 5 to shrink inward, thereby separating the molding component 5 from the internal thread of the plastic part, thereby facilitating the rapid demoulding of the plastic part without rotating the core and avoiding contact with the internal thread.

[0025] Reference Figures 3 to 5In this embodiment, preferably: the molding assembly 5 includes three first thread segments 501 and three second thread segments 502, the three first thread segments 501 and the three second thread segments 502 are arranged in a ring array and staggered, and the first thread segment 501 fits with the adjacent second thread segment 502. The inner walls of the first thread segment 501 and the second thread segment 502 are fixedly mounted with a partition bar 503, and the partition bar 503 is driven by the adjustment assembly 7, and the top and bottom of the partition bar 503 are respectively slidably matched with the top cover 4 and the base 3, so that when the partition bar 503 drives the first thread segment 501 / the second thread segment 502 to move, it can only move horizontally without being offset in the up and down directions; accordingly, the top and bottom of the first thread segment 501 / the second thread segment 502 are also respectively slidably matched with the top cover 4 and the base 3.

[0026] Among them, the top cover 4 itself has a certain wall thickness, which is used for the opening of the groove and can be used to slide and place the partition bar 503, which acts on the top of the partition bar 503; and a boss 301 is formed inwardly on the surface of the base 3, and the boss 301 can be adapted to the wall thickness of the top cover 4, and then used to slide and place the partition bar 503, and act on the bottom of the partition bar 503; at the same time, the central axis 6 is fixedly connected to the top cover 4 to form a corresponding support.

[0027] In the above structure, the surface where the first thread segment 501 and the second thread segment 502 fit together is set as a slope 504, which allows the first thread segment 501 to shrink inward first, and then the second thread segment 502 to shrink inward, so that the shrinkage between the first thread segment 501 and the second thread segment 502 will not cause interference. Figure 5 The slope 504 is parallel to the length direction of the partition bar 503 on the first thread segment 501, and is also parallel to the surface of the partition bar 503 corresponding to the first thread segment 501.

[0028] In this embodiment, the number of the first thread segments 501 and the second thread segments 502 are both three. In actual applications, the number of the first thread segments 501 and the second thread segments 502 may be increased or decreased accordingly as long as the contraction and expansion can be achieved.

[0029] Reference Figures 3 to 5, in this embodiment, it is preferred that the adjustment assembly 7 includes a cylinder 702 fixedly installed in the base 3 and two rings 701 with a movable sleeve arranged outside the central shaft 6. The outer surface of the central shaft 6 is formed with a table so that the upper ring 701 cannot fall, so that the upper ring 701 can only rise based on the table. A spring 704 is provided with a common sleeve between the upper ring 701 and the top cover 4. The spring 704 makes the upper ring 701 have a tendency to move downward, and thus makes the upper ring 701 limited to the table. The output shaft of the cylinder 702 is fixedly connected to the bottom surface of the lower ring 701, which can drive the lower ring 701 to lift and lower. A lifting rod 703 is fixedly installed on the top surface of the lower ring 701. When the lower ring 701 rises, the upper ring 701 can be pushed up synchronously through the lifting rod 703 and squeezed the spring 704.

[0030] Among them, the outer surfaces of the upper ring 701 and the lower ring 701 are both rotatably mounted with connecting rod 705, and the ends of connecting rod 705 are rotatably cooperated with partition bar 503; in this embodiment, the number of connecting rods 705 is six, corresponding to the first threaded section 501 and the second threaded section 502, respectively. Among them, the connecting rod 705 on the upper ring 701 rotates and cooperates with the partition 503 on the second threaded section 502, and the connecting rod 705 on the lower ring 701 rotates and cooperates with the partition 503 on the first threaded section 501; thereby, when the cylinder 702 is started, the first threaded section 501 can be driven to first shrink inward through the lower ring 701 and the connecting rod 705, and then the lifting rod 703 contacts the bottom surface of the upper ring 701 to drive the upper ring 701 to rise, and then drives the second threaded section 502 to shrink inward again.

[0031] In the above structure, because the first thread segment 501 and the second thread segment 502 are arranged in an array and staggered, and the spacer 503 is installed on the first thread segment 501 and the second thread segment 502 in sequence, the three connecting rods 705 of the upper ring 701 and the three connecting rods 705 of the lower ring 701 can be automatically arranged in an array and staggered; thereby, the movement of the first thread segment 501 and the second thread segment 502 is also more stable.

[0032] When in use, the front mold 2 and the rear mold 1 are closed, and the plastic part is molded through the slider body, the embedded component, the base 3, the first thread segment 501, the second thread segment 502 and the top cover 4. After molding, the front mold 2 first drives the slider body and the embedded component to move away. Then the cylinder 702 is started to drive the lower ring 701 and the lifting rod 703 to rise. The lower ring 701 drives the corresponding partition bar 503 to translate through the lower connecting rod 705, so that the first thread segment 501 shrinks inward along the bottom surface of the top cover 4 and the top surface of the boss 301. After shrinkage, the lifting rod 703 contacts the upper ring 701 and drives the upper ring 701 to rise. At this time, the upper connecting rod 705 can drive the corresponding partition bar 503 to translate, so that the second thread segment 502 also shrinks inward along the top surface of the top cover 4 and the top surface of the boss 301, and finally the first thread segment 501 and the second thread segment 502 are separated from the internal thread of the plastic part. At this time, the plastic part can be quickly demolded by simply translating the plastic part along the top cover 4.

[0033] In summary, through the cooperation of the first thread segment 501, the second thread segment 502, the spacer 503 and the connecting rod 705, the first thread segment 501 and the second thread segment 502 can be driven to shrink inward in sequence, and after shrinking, they can be separated from the internal thread of the plastic part, thereby facilitating the rapid demoulding of the plastic part and avoiding contact with the internal thread, which can effectively ensure the overall internal quality of the plastic part. When demoulding, it is only necessary to translate the plastic part along the top cover 4, and there is no need to continuously rotate the plastic part and the core, which makes the demoulding method simpler and the demoulding speed is also improved; at the same time, there is no need to install a driving part outside the rear mold 1 to drive the core to rotate, which can ensure the sealing effect of the front mold 2 and the rear mold 1, and is more practical.

[0034] Embodiment 2: See also Figures 1 to 7 On the basis of the first embodiment, considering that after the first thread segment 501 and the second thread segment 502 shrink, the plastic part still remains completely mounted on the top cover 4, so that the demolding of the plastic part requires a longer translation distance along the top cover 4, so that the demolding process still needs to be improved.

[0035] To this end, the top cover 4 is improved: the surface of the top cover 4 is slidably mounted with support rods 8. In this embodiment, the number of support rods 8 is set to three and arranged in a circular array. In a normal state, the support rods 8 are stored in the top cover 4 and their top surfaces are kept flush with the top surface of the top cover 4. When the support rods 8 rise, they can push the plastic part to move along the top cover 4.

[0036] In order to achieve the lifting and lowering of the support rod 8, a bracket 706 corresponding to the support rod 8 is fixedly installed on the surface of the upper ring 701. When the upper ring 701 drives the second threaded section 502 to retract inward, the bracket 706 can also contact the support rod 8 and push the support rod 8 to rise.

[0037] When in use, through the structures such as the first thread segment 501, the second thread segment 502 and the connecting rod 705, the first thread segment 501 and the second thread segment 502 can be driven to shrink inwards in sequence and separate from the internal threads of the plastic part, which can avoid contact with the internal threads and facilitate the rapid demoulding of the plastic part. The working process and effect of this part are the same as those in the first embodiment and will not be repeated here. The difference is that when the upper ring 701 rises, on the one hand, it drives the upper connecting rod 705 to move, and the upper connecting rod 705 can drive the corresponding partition bar 503 and the second thread segment 502 to shrink inwards, and on the other hand, it can drive the bracket 706 to rise. When the second thread segment 502 shrinks inwards, the bracket 706 also contacts the support rod 8 and drives the support rod 8 to rise. At this time, the support rod 8 drives the plastic part to move along the top cover 4 through the partition platform of the plastic part.

[0038] Compared with the first embodiment, through the cooperation of the structures such as the circular ring 701, the bracket 706, the top cover 4 and the support rod 8, when the upper circular ring 701 rises, it can not only drive the second threaded section 502 to shrink inward, but also drive the support rod 8 to rise and push the plastic part to move along the top cover 4, so that the demoulding of the plastic part does not need to move a long distance along the top cover 4, which can further improve the demoulding speed of the plastic part and ensure the overall processing efficiency. The overall solution is combined with the movement of the upper circular ring 701, and can be effectively applied to the existing U-shaped plastic parts. The support rod 8 can contact the inner wall of the U-shaped plastic part, thereby improving the application range of the mold and making it more applicable.

[0039] Embodiment three: See also Figures 1 to 10 On the basis of the second embodiment, considering that the molding of plastic parts is mostly done by injection molding, there is often adhesion between the rib plate and the groove of the top cover 4 and between the plastic part and the outer surface of the top cover 4, which affects the overall rapid demolding of the plastic part.

[0040] To this end, the top cover 4 is further improved: a moving assembly 9 is provided between the inner top wall of the top cover 4 and one of the brackets 706. When the bracket 706 moves and contacts the support rod 8, the top rod can be driven to rotate by the moving assembly 9. In this embodiment, the moving assembly 9 is located in the middle of the inner top wall of the top cover 4 and is rotatably matched with the top of the central shaft 6. The spring 704 is located between the upper ring 701 and the moving assembly 9.

[0041] Reference Figure 8 and Fig.10In this embodiment, preferably, the moving assembly 9 includes a cylinder 905 fixedly connected to the inner top wall of the top cover 4 and a pad 902 fixedly connected to the corresponding bracket 706. The outer surface of the cylinder 905 is provided with a spiral groove 903. A telescopic rod 904 is fixedly installed on the top of the pad 902. A slide bar 901 slidably installed in the spiral groove 903 is fixedly installed on the movable end of the telescopic rod 904. The slide bar 901 can only move up and down through the telescopic rod 904 and the bracket 706, so that when the slide bar 901 rises, the cylinder 905 and the top cover 4 can be driven to rotate through the spiral groove 903.

[0042] It should be noted that the telescopic rod 904 itself has a certain movable range in the up-down direction, and the movable range enables the corresponding bracket 706 to descend along with the upper ring 701. When the upper ring 701 drives the bracket 706 to rise, the telescopic rod 904 contracts, and when the bracket 706 contacts the support rod 8, the telescopic rod 904 contracts to the limit state. At this time, when the bracket 706 rises again, the telescopic rod 904 can drive the sliding rod 901 to move.

[0043] In practical applications, when the rotation angle of the top cover 4 is large, the width of the bracket 706 can be increased accordingly so that the support rod 8 will not lose contact with the bracket 706.

[0044] When in use, the first thread segment 501, the second thread segment 502 and the connecting rod 705 and other structures can drive the first thread segment 501 and the second thread segment 502 to shrink inwards in sequence and separate from the internal thread of the plastic part, which can avoid contact with the internal thread and facilitate the rapid demoulding of the plastic part; through the ring 701, the bracket 706 and the support rod 8 and other structures, the support rod 8 can be driven to rise and push the plastic part to move along the top cover 4, so that the demoulding of the plastic part does not need to move a long distance along the top cover 4. The working process and effect of this part are the same as those in the second embodiment and will not be repeated here. The difference is that: when the bracket 706 rises and contacts the support rod 8, the telescopic rod 904 shrinks to the limit state and the sliding rod 901 can move. At this time, when the bracket 706 rises again, it can drive the plastic part to move through the support rod 8, and can also drive the top cover 4 to rotate by itself through the spiral groove 903 to provide a swinging force for the plastic part.

[0045] Compared with the second embodiment, through the cooperation of the structures such as the bracket 706, the telescopic rod 904, the slide bar 901 and the spiral groove 903, when the bracket 706 rises and drives the support rod 8 to move, it can also drive the top cover 4 to rotate to provide a swinging force for the plastic part, which can reduce the adhesion between the plastic part and the top cover 4, and is more conducive to the rapid demoulding of the plastic part, further ensuring the overall processing efficiency. The overall solution is combined with the movement of the bracket 706, which has a better demoulding effect, a higher utilization rate of the bracket 706 and the ring 701 structure, and meets more needs in actual use.

Claims

1. A plastic molding mold suitable for complex parts, comprising a front mold and a rear mold, wherein a slider body and an insert are arranged on the front mold, characterized in that: The rear mold is provided with a base and a top cover, the base is fixedly connected to the rear mold and a central axis for supporting the top cover is fixedly installed inside the base, a molding component for internal thread molding is provided between the base and the top cover, and an adjustment component for moving the molding component is provided between the base, the top cover and the central axis; starting the adjustment component can drive the molding component to shrink inward, so that the molding component is separated from the internal thread of the plastic part.

2. The plastic molding mold suitable for complex parts according to claim 1, characterized in that: The forming component includes a plurality of first thread segments and a plurality of second thread segments, which are arranged in a ring array and staggered, and the first thread segments are fitted with adjacent second thread segments; the inner walls of the first thread segments and the second thread segments are fixedly installed with partitions driven by the adjustment component, and the top and bottom of the partitions are respectively slidably matched with the top cover and the base.

3. The plastic molding mold suitable for complex parts according to claim 2, characterized in that: The outer surface of the top cover is provided with a groove for molding plastic parts, the top cover is formed with a wall thickness for the opening of the groove and for the sliding of the top surface of the partition bar, and a boss is formed inwardly on the surface of the base for the sliding of the bottom surface of the partition bar.

4. The plastic molding die for complex parts according to claim 2, characterized in that: The surface where the first thread segment and the second thread segment fit together is configured as a slope, and the slope enables the first thread segment to shrink inward first, and then the second thread segment shrinks inward.

5. The plastic molding die for complex parts according to claim 2, characterized in that: The adjustment assembly includes a cylinder fixedly installed in the base and two circular rings movably mounted outside the central axis, a spring is commonly mounted between the upper circular ring and the top cover, the output shaft of the cylinder is fixedly connected to the lower circular ring, and a lifting rod is fixedly installed on the top surface of the lower circular ring, connecting rods are rotatably mounted on the outer surfaces of the upper circular ring and the lower circular ring, and the ends of the connecting rods are rotatably matched with the spacer bars.

6. The plastic molding die for complex parts according to claim 5, characterized in that: The connecting rod on the upper circular ring is rotationally matched with the spacer on the second threaded segment, and the connecting rod on the lower circular ring is rotationally matched with the spacer on the first threaded segment.

7. The plastic molding die for complex parts according to claim 5, characterized in that: The outer surface of the central shaft is formed with a table surface for supporting the upper circular ring. The spring makes the upper circular ring have a tendency to move downward, so that the bottom surface of the upper circular ring can be against the table surface.

8. The plastic molding die for complex parts according to claim 5, characterized in that: When the lower circular ring drives the first thread segment to contract through the lower connecting rod, the lifting rod can contact the upper circular ring and push it to rise, thereby causing the second thread segment to contract inward again through the upper connecting rod.

9. The plastic molding die for complex parts according to any one of claims 5 to 8, characterized in that: A plurality of support rods are slidably mounted on the surface of the top cover, and the support rods are arranged in a circular array based on the top cover. A bracket corresponding to the support rods is fixedly mounted on the surface of the upper ring, and the support rods can be driven to rise when the brackets contact the support rods.

10. The plastic molding die for complex parts according to claim 9, characterized in that: The support rod slides up and down based on the top cover, and the top surface of the support rod is flush with the top surface of the top cover.

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