An injection mold for internal thread plastic gear

Abstract

The present invention relates to the field of mold technology, and specifically to an internal threaded plastic gear injection mold, comprising a fixed mold and a movable mold, a rotatable threaded column is arranged in the mold groove of the movable mold, a mold splitting torque output device capable of outputting torque when the mold is split is arranged between the movable mold and the fixed mold, the mold splitting torque output device has a torque output part coaxial with the threaded column, an elastic torque connector is arranged between the torque output part and the threaded column, and the elastic torque connector is used to input flexible torque to the threaded column. The present application can generate torque during mold splitting through the mold splitting torque output device, and transmit it to the threaded column through the elastic torque connector, so that after the mold is completely split, the elastic torque connector can guide the threaded column to rotate, thereby being able to withdraw the plastic gear in the movable mold groove, thereby completing demolding, solving the problem that the existing mold requires auxiliary power when producing an internal threaded plastic gear chamber, thereby resulting in high production costs.

Description

Technical Field

[0001] The invention relates to the technical field of molds, in particular to an injection mold for an internally threaded plastic gear. Background Art

[0002] When producing plastic parts with threaded structures, the parts cannot be directly removed due to interference between the parts and the threaded parts of the mold. Instead, the mold is rotated to unscrew the threaded mating parts and then demolded. Existing threaded demolding molds generally use racks and threaded stripping rods or screw control solutions to demold the parts, and the driving of the rotating parts mostly uses auxiliary driving elements such as hydraulic motors. The required auxiliary power is high and the existing mold opening power of the injection molding machine cannot be fully utilized, resulting in increased auxiliary costs and low production efficiency during the injection molding production process.

[0003] Chinese patent publication number CN109551719B discloses a mold with a turntable helical gear self-lubricating demolding mechanism, including a panel, a gate bushing, a stripper plate, a fixed mold plate, a movable mold push plate, a movable mold plate, a movable mold pad, a mold foot, first to fifth parting surfaces, each parting surface is respectively provided with a first to fifth elastic device, and each mold plate adjacent to the parting surface is provided with an ejection limit pull rod, a flow channel is provided in the panel, the stripper plate and the fixed mold plate, a sliding groove is provided on the fixed mold plate, a Haver slider is provided on the fixed mold plate, a guide column is connected to the Haver slider, a limiting groove is provided on the Haver slider, a limiting pin is provided on the fixed mold plate, a limiting hole is provided on the Haver slider, the limiting hole is connected to the limiting hook, the movable mold push plate ejector rod is fixed to the ejector cover plate, a third through hole is provided in the bottom plate, and an ejector rod is provided on the injection molding machine.

[0004] The mold automatically separates in sequence on each parting surface when the mold is opened, but it is not possible to injection mold a plastic gear with an internal thread. Summary of the invention

[0005] In view of the above problems, an internally threaded plastic gear injection mold is provided, which can generate torque during mold separation through a mold separation torque output device, and transmit it to the threaded column through an elastic torque connector, so that after complete mold separation, the elastic torque connector can guide the threaded column to rotate, thereby being able to withdraw the plastic gear in the dynamic model groove, thereby completing the demolding, solving the problem that the existing mold requires auxiliary power when producing internally threaded plastic gear chambers, resulting in higher production costs.

[0006] In order to solve the problems of the prior art, the present invention provides an internal threaded plastic gear injection mold, including a fixed mold and a movable mold, a rotatable threaded column is arranged in the mold groove of the movable mold, a split mold torque output device capable of outputting torque when the mold is split is arranged between the movable mold and the fixed mold, the split mold torque output device has a torque output part coaxial with the threaded column, an elastic torque connector is arranged between the torque output part and the threaded column, and the elastic torque connector is used to input flexible torque to the threaded column.

[0007] Preferably, a torque multiplier is provided between the torque output part and the elastic torque connector, and the torque multiplier is used to multiply the torque of the split-mode torque output device and then transmit it to the elastic torque connector.

[0008] Preferably, the split mold torque output device includes a fixed rod connected to the fixed mold, and an active sleeve rotatably set on the movable mold to form a torque output part, the fixed rod is provided with a driving arc groove coaxial with the fixed rod on the circumferential surface, and the active sleeve is provided with a convex column extending radially thereof on the inner circumferential surface, and the convex column is slidably matched with the driving arc groove.

[0009] Preferably, the driving arc grooves are distributed on the circumferential surface of the fixing rod along the circumferential direction.

[0010] Preferably, one end of the active sleeve is provided with a connecting cylinder fixedly connected to the movable mold, the inner end of the active sleeve is provided with a mounting groove extending radially thereof, one end of the protruding column is provided with a mosaic block, the mosaic block is installed in the mounting groove, and the inner end of the active sleeve is provided with an externally threaded sleeve threadably connected thereto, the externally threaded sleeve abuts against one end of the mosaic block to prevent the mosaic block from detaching from the mounting groove.

[0011] Preferably, a driving column coaxial with the threaded column and passing through the movable mold is provided at one end, and the elastic torque connector includes a driven sleeve coaxially rotatably arranged on the driving column, and a torque energy storage assembly arranged between the inner circumferential surface of the driven sleeve and the circumferential surface of the driving column. The driven sleeve is transmission-connected to the active sleeve, and the rotational torque of the driven sleeve is transmitted to the driving column by the torque energy storage assembly when the mold is separated.

[0012] Preferably, the torque energy storage assembly includes a sliding ring and an elastic element. The inner circumferential surface of the driven sleeve is provided with a driven arc groove. The sliding ring is axially slidably arranged on the driving column. The outer circumferential surface of the sliding ring is provided with a guide column extending radially thereof. The guide column extends into the driven arc groove and slides with it. The elastic element is arranged between the inner circumferential surface of the driven sleeve and the circumferential surface of the driving column. When the driven sleeve rotates, the sliding ring slides along its axial direction and compresses the elastic element.

[0013] Preferably, positioning rings are provided at both ends of the driving column, and the elastic element and the sliding ring are located between the two positioning rings.

[0014] Preferably, stepped grooves are provided at both ends of the inner circumferential surface of the driven sleeve, and the stepped grooves at both ends of the driven sleeve abut against the opposite ends of the two positioning rings respectively.

[0015] Preferably, the torque multiplier comprises a driving gear, a linkage gear and a driven gear with successively decreasing diameters, the driving gear is coaxially fixedly arranged on the driving sleeve, the linkage gear is rotatably arranged in the movable mold, the driven gear is coaxially fixedly arranged on the driven sleeve, and the driving gear, the linkage gear and the driven gear are meshed in sequence.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present application can generate torque during mold separation through a mold separation torque outputter, and transmit it to the threaded column through an elastic torque connector installed on the fixed mold. After the mold is completely separated, the elastic torque connector can guide and drive the threaded column to rotate, so that it pushes out the plastic gear in the dynamic model groove, thereby realizing an automatic and efficient demolding process.

[0018] Compared with the traditional demoulding method, the design of this embodiment significantly reduces the dependence on auxiliary power. In the traditional method, additional mechanical equipment or manual operation is often required to assist demoulding, which undoubtedly increases the production cost and time cost. However, this embodiment realizes the automation and efficiency of the demoulding process through the built-in mold separation torque output device and elastic torque connector, which not only saves manpower and material resources, but also improves production efficiency.

[0019] In addition, since the need for external auxiliary power is reduced, the mold of this embodiment is more concise and compact in design and manufacturing, which is conducive to reducing the overall manufacturing cost. At the same time, since the demoulding process is smoother and more stable, it is also helpful to improve the quality and consistency of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional diagram of an internal thread plastic gear injection mold when the mold is closed.

[0021] Figure 2 It is a three-dimensional cross-sectional view of an internal thread plastic gear injection mold when the mold is closed.

[0022] Figure 3 This is a front view of an internal thread plastic gear injection mold when the mold is closed.

[0023] Figure 4 yes Figure 3 Cross-sectional view in the AA direction.

[0024] Figure 5 yes Figure 4 A partial enlarged view of point B.

[0025] Figure 6 yes Figure 3 Cross-sectional view along the CC direction.

[0026] Figure 7 It is a three-dimensional diagram of an internal thread plastic gear injection mold during mold separation.

[0027] Figure 8 It is a stereoscopic view of a torque multiplier in an injection mold for an internally threaded plastic gear.

[0028] Fig. 9 A perspective view of an elastic torque connector in an injection mold for an internally threaded plastic gear.

[0029] Fig.10 It is a three-dimensional exploded view of a flexible torque connector in an internally threaded plastic gear injection mold.

[0030] The numbers in the figure are: 1, fixed mold; 2, movable mold; 3, threaded column; 31, driving column; 32, positioning ring; 4, split mold torque output device; 42, fixed rod; 421, driving arc groove; 43, active sleeve; 431, convex column; 432, connecting cylinder; 433, fitting block; 434, external threaded sleeve; 5, elastic torque connector; 51, driven sleeve; 511, driven arc groove; 521, sliding ring; 522, elastic element; 523, guide column; 6, torque multiplier; 61, driving gear; 62, linkage gear; 63, driven gear. DETAILED DESCRIPTION

[0031] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] like Figure 1 , Figure 2 , Figure 3 As shown, this application provides:

[0033] A plastic gear injection mold with internal threads comprises a fixed mold 1 and a movable mold 2. A rotatable threaded column 3 is arranged in the mold groove of the movable mold 2. A mold-parting torque output device 4 capable of outputting torque when the molds are parted is arranged between the movable mold 2 and the fixed mold 1. The mold-parting torque output device 4 has a torque output part coaxial with the threaded column 3. An elastic torque connector 5 is arranged between the torque output part and the threaded column 3. The elastic torque connector 5 is used to input flexible torque to the threaded column 3.

[0034] A rotatable threaded column 3 is arranged in the groove of the movable mold 2. The threaded column 3 is a key component for forming the internal thread of the gear. Through its rotational motion, the molded plastic gear can be pushed out of the groove of the movable mold 2 to achieve efficient demoulding.

[0035] In order to drive the threaded column 3 to rotate, a splitting torque output device 4 capable of outputting torque during mold separation is installed between the movable mold 2 and the fixed mold 1. This device can quickly and accurately generate and output the necessary torque during mold separation, providing power for the subsequent demolding action. The torque output part of the splitting torque output device 4 is coaxially arranged with the threaded column 3, ensuring the accuracy and stability of torque transmission.

[0036] An elastic torque connector 5 is also provided between the torque output part and the threaded column 3. This connector not only serves to connect the two, but more importantly, it can transmit the torque to the threaded column 3 in a flexible manner after receiving the torque from the mold splitting torque output device 4. This flexible torque transmission method effectively avoids problems such as component damage or poor demoulding caused by excessive torque or uneven transmission, and ensures a smooth demoulding process.

[0037] In this embodiment, a torque can be generated during mold separation through the mold separation torque output device 4, and is transmitted to the threaded column 3 through the elastic torque connector 5 installed on the fixed mold 1. After the mold is completely separated, the elastic torque connector 5 can guide and drive the threaded column 3 to rotate, so that it pushes out the plastic gear in the groove of the movable mold 2, thereby realizing an automatic and efficient demolding process.

[0038] Compared with the traditional demoulding method, the design of this embodiment significantly reduces the dependence on auxiliary power. In the traditional method, additional mechanical equipment or manual operation is often required to assist demoulding, which undoubtedly increases the production cost and time cost. However, this embodiment realizes the automation and efficiency of the demoulding process through the built-in mold separation torque output device 4 and the elastic torque connector 5, which not only saves manpower and material resources, but also improves production efficiency.

[0039] In addition, since the need for external auxiliary power is reduced, the mold of this embodiment is more concise and compact in design and manufacturing, which is conducive to reducing the overall manufacturing cost. At the same time, since the demoulding process is smoother and more stable, it is also helpful to improve the quality and consistency of the product.

[0040] like Figure 3 and Figure 8 As shown, a torque multiplier 6 is provided between the torque output part and the elastic torque connector 5 , and the torque multiplier 6 is used to multiply the torque of the split-mode torque output device 4 and transmit it to the elastic torque connector 5 .

[0041] A torque multiplier 6 is provided between the torque output part and the elastic torque connector 5. The torque multiplier 6 is like a power amplifier, which can multiply the original torque generated by the mold splitting torque output 4 and then transmit it to the elastic torque connector 5. In this way, the torque that may be slightly insufficient becomes stronger after multiplication, which is enough to easily drive the threaded column 3 to complete the rotation demolding action.

[0042] As a bridge for torque transmission, the elastic torque connector 5 not only ensures the smooth transmission of torque from the torque multiplier 6 to the threaded column 3, but also effectively absorbs the impact and vibration during the transmission process through its elastic design, protecting the various components of the mold from damage. At the same time, this flexible connection also makes the transmission of torque more stable and reliable, avoiding demoulding failure or product quality problems caused by sudden changes in torque.

[0043] like Figure 4 and Figure 6 As shown, the split mold torque output device 4 includes a fixed rod 42 connected to the fixed mold 1, and an active sleeve 43 rotatably set on the movable mold 2 to form a torque output part, and a driving arc groove 421 coaxial with the fixed rod 42 is provided on the circumferential surface of the fixed rod 42, and a convex column 431 extending radially thereof is provided on the inner circumferential surface of the active sleeve 43, and the convex column 431 is slidably matched with the driving arc groove 421.

[0044] A driving arc groove 421 coaxial with the fixing rod 42 is designed on the circumferential surface thereof. The driving arc groove 421 perfectly matches with the convex column 431 inside the active sleeve 43. When the mold enters the mold separation stage, the driving arc groove 421 moves with the rotation of the fixing rod 42, providing a clear motion trajectory for the convex column 431.

[0045] A convex column 431 extending radially is provided on the inner circumferential surface of the active sleeve 43. The convex column 431 is not only structurally strong, but also closely matches the driving arc groove 421. During the mold separation process, the convex column 431 will rotate relative to the fixed rod 42 along the trajectory of the driving arc groove 421, thereby driving the active sleeve 43 to rotate. As the active sleeve 43 rotates, its external torque output part will generate corresponding torque, providing power for the subsequent demolding action.

[0046] like Figure 8 As shown, the driving arc grooves 421 are distributed on the circumferential surface of the fixing rod 42 along the circumferential direction.

[0047] By distributing driving arc grooves 421 circumferentially on the circumferential surface of the fixed rod 42 and providing corresponding convex columns 431 on the inner side of the active sleeve 43, when the fixed rod 42 slides relative to the movable mold 2, the active sleeve 43 is more stably stressed and rotated due to the convex columns 431 distributed circumferentially on the inner side, thereby ensuring the balance of torque transmission and enabling the active sleeve 43 to move smoothly along a predetermined trajectory during rotation, thereby avoiding jamming or damage caused by uneven force.

[0048] like Figure 6 As shown, one end of the active sleeve 43 is provided with a connecting cylinder 432 fixedly connected to the movable mold 2, the inner end of the active sleeve 43 is provided with a mounting groove extending radially thereof, one end of the protrusion 431 is provided with a fitting block 433, the fitting block 433 is installed in the mounting groove, the inner end of the active sleeve 43 is provided with an external threaded sleeve 434 threadedly connected thereto, the external threaded sleeve 434 abuts against one end of the fitting block 433 to prevent the fitting block 433 from being separated from the mounting groove.

[0049] A connecting tube 432 is provided at one end of the active sleeve 43 and is fixedly connected to the movable mold 2. The connecting tube 432 is not only structurally strong, but also seamlessly connected to the movable mold 2 through precise processing technology. When the movable mold 2 moves under the drive of the injection molding machine, the active sleeve 43 can move synchronously with it, ensuring the continuity and stability of torque transmission.

[0050] A mounting groove extending radially is provided on the inner side of the active sleeve 43. The mounting groove has a precise shape and reasonable size, providing a perfect mounting space for the engaging block 433 of the boss 431. When the engaging block 433 is accurately embedded in the mounting groove, a close fitting relationship can be formed between them, ensuring the accuracy and efficiency of torque transmission.

[0051] In order to prevent the engaging block 433 from being disengaged from the mounting groove due to excessive force during operation, an external thread sleeve 434 is provided at the inner end of the active sleeve 43 and is threadedly connected thereto. The external thread sleeve 434 is not only compact in structure and easy to install, but can also effectively abut against one end of the engaging block 433. When the external thread sleeve 434 is tightened, it will generate an inward pressure on the engaging block 433, thereby preventing it from being disengaged from the mounting groove. This design not only improves the structural strength of the active sleeve 43, but also enhances its working stability.

[0052] like Figure 5 , Figure 7 , Figure 8 , Fig. 9 and Fig.10As shown, one end of the threaded column 3 is provided with a driving column 31 which is coaxial therewith and passes through the movable mold 2. The elastic torque connector 5 includes a driven sleeve 51 which is coaxially rotatably arranged on the driving column 31, and a torque storage assembly which is arranged between the inner circumferential surface of the driven sleeve 51 and the circumferential surface of the driving column 31. The driven sleeve 51 is transmission-connected with the active sleeve 43. When the mold is separated, the rotational torque of the driven sleeve 51 is transmitted to the driving column 31 by the torque storage assembly.

[0053] One end of the driving column 31 is connected to the threaded column 3 and is coaxially arranged therewith. The driving column 31 penetrates the movable mold 2 and becomes an important bridge connecting the inside of the mold with the external power source. When the external power is transmitted to the threaded column 3 through the injection molding machine, the driving column 31 can rotate accordingly, providing a solid foundation for subsequent torque transmission.

[0054] The elastic torque connector 5 is mainly composed of two parts: a driven sleeve 51 and a torque energy storage assembly. The driven sleeve 51, a component coaxially rotatably arranged on the driving column 31, is not only light in structure and flexible in rotation, but also realizes a precise transmission connection with the active sleeve 43. In this way, when the active sleeve 43 is rotated by the torque during the mold separation process, its rotational torque can be quickly and accurately transmitted to the driven sleeve 51.

[0055] The torque energy storage component is arranged between the inner circumference of the driven sleeve 51 and the circumference of the driving column 31, which not only plays the role of transmitting torque, but also can store and release energy to a certain extent. During the mold separation process, when the driven sleeve 51 is subjected to rotational torque, the torque energy storage component will respond quickly, transmit the torque to the driving column 31, and at the same time store a part of the energy for subsequent use. This design not only improves the efficiency and stability of torque transmission, but also enables the mold to run more steadily and smoothly during the mold separation process.

[0056] like Figure 5 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown, the torque energy storage assembly includes a sliding ring 521 and an elastic element 522. The inner circumferential surface of the driven sleeve 51 is provided with a driven arc groove 511. The sliding ring 521 is axially fitted and slidably arranged on the driving column 31. The outer circumferential surface of the sliding ring 521 is provided with a guide column 523 extending along its radial direction. The guide column 523 extends into the driven arc groove 511 and slides with it. The elastic element 522 is arranged between the inner circumferential surface of the driven sleeve 51 and the circumferential surface of the driving column 31. When the driven sleeve 51 rotates, the sliding ring 521 slides along its axial direction and compresses the elastic element 522.

[0057] The sliding ring 521 is configured to be axially engaged and slidably arranged on the driving column 31. On the outer circumference of the sliding ring 521, a plurality of guide columns 523 extending in the radial direction are evenly distributed. They can extend into the driven arc groove 511 arranged on the inner circumference of the driven sleeve 51 and form a tight sliding fit with the driven arc groove 511. This design ensures that the sliding ring 521 can slide smoothly along a predetermined trajectory when subjected to torque, thereby realizing torque transmission.

[0058] The elastic element 522 is arranged between the inner circumference of the driven sleeve 51 and the circumference of the driving column 31. It is like a "spring pad" that can store energy when squeezed and release energy when needed. When the driven sleeve 51 starts to rotate, the sliding ring 521 will slide along its axial direction due to the sliding fit between the guide column 523 and the driven arc groove 511. In this process, the sliding ring 521 will compress the elastic element 522 to store a certain amount of energy. When the compression of the elastic element 522 reaches the maximum value, the driven sleeve 51 can drive the driving column 31 to rotate, and then drive the threaded column 3 to rotate and demold, thereby preventing the rigid torque generated at the beginning of demolding from being directly transmitted to the driving column 31 and causing the driving column 31 to break.

[0059] like Figure 5 As shown, positioning rings 32 are provided at both ends of the driving column 31 , and the elastic element 522 and the sliding ring 521 are located between the two positioning rings 32 .

[0060] The positioning ring 32 not only plays a role of fixing and supporting, but also provides a precise working range for the elastic element 522 and the sliding ring 521. Specifically, the elastic element 522 and the sliding ring 521 are installed between the two positioning rings 32, forming a compact and orderly working environment.

[0061] The positioning ring 32 ensures that the elastic element 522 and the sliding ring 521 will not deviate or shake when subjected to torque, thereby ensuring the accuracy and stability of torque transmission. Secondly, the positioning ring 32 also limits the axial movement range of the elastic element 522 and the sliding ring 521, avoiding damage or failure due to excessive movement during operation. Finally, by accurately controlling the distance between the two positioning rings 32, the preload force of the elastic element 522 and the sliding resistance of the sliding ring 521 can be easily adjusted to meet the torque transmission requirements under different working conditions.

[0062] like Figure 5 As shown, stepped grooves are provided at both ends of the inner circumferential surface of the driven sleeve 51 , and the stepped grooves at both ends of the driven sleeve 51 abut against the opposite ends of the two positioning rings 32 respectively.

[0063] The stepped grooves at both ends of the driven sleeve 51 are respectively precisely abutted against the opposite ends of the two positioning rings 32. This close contact ensures that the driven sleeve 51 will not move axially or deviate circumferentially during the rotation process.

[0064] First, the close fit between the stepped groove and the positioning ring 32 effectively limits the freedom of movement of the driven sleeve 51, so that the driven sleeve 51 can transmit torque more stably when subjected to torque. Second, this design also enhances the connection strength between the driven sleeve 51 and the driving column 31, improving the overall rigidity and durability of the mold.

[0065] like Figure 8 As shown, the torque multiplier 6 includes a driving gear 61, a linkage gear 62 and a driven gear 63 with diameters decreasing in sequence. The driving gear 61 is coaxially fixedly arranged on the driving sleeve 43, the linkage gear 62 is rotatably arranged in the movable mold 2, and the driven gear 63 is coaxially fixedly arranged on the driven sleeve 51. The driving gear 61, the linkage gear 62 and the driven gear 63 are meshed in sequence.

[0066] The diameters of the driving gear 61, the linkage gear 62 and the driven gear 63 are reduced in sequence, forming a speed reduction and torque increase structure. The driving gear 61, as the input end of the torque, is coaxially fixedly arranged on the driving sleeve 43. In this way, when the driving sleeve 43 is driven to rotate by external power, the driving gear 61 will also rotate, becoming the starting point of torque transmission.

[0067] The linkage gear 62 is rotatably disposed in the movable mold 2. As an intermediate transmission link, it serves as a bridge connecting the driving gear 61 and the driven gear 63. Through the carefully designed tooth shape and meshing relationship, the linkage gear 62 can ensure the stability and continuity of the torque during the transmission process.

[0068] The driven gear 63 is the output end of the torque, and it is coaxially fixedly arranged on the driven sleeve 51. As the driving gear 61 and the linkage gear 62 rotate, the driven gear 63 will also start to rotate according to the predetermined reduction ratio. Since the driven gear 63 has the smallest diameter, it can output a greater torque under the same angular velocity. This design not only achieves the torque multiplication effect, but also enables the mold to more easily overcome various resistances during the injection molding process.

[0069] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. An internal thread plastic gear injection mold, comprising a fixed mold (1) and a movable mold (2), characterized in that: A rotatable threaded column (3) is arranged in the groove of the movable mold (2); a split mold torque output device (4) capable of outputting torque when the molds are split is arranged between the movable mold (2) and the fixed mold (1); the split mold torque output device (4) has a torque output portion coaxial with the threaded column (3); an elastic torque connector (5) is arranged between the torque output portion and the threaded column (3); the elastic torque connector (5) is used to input a flexible torque to the threaded column (3); A torque multiplier (6) is provided between the torque output portion and the elastic torque connector (5), and the torque multiplier (6) is used to multiply the torque of the split-mode torque output device (4) and transmit it to the elastic torque connector (5); The split-mold torque output device (4) comprises a fixed rod (42) connected to the fixed mold (1), and an active sleeve (43) rotatably arranged on the movable mold (2) to form a torque output portion, the fixed rod (42) being provided with a driving arc groove (421) coaxial therewith on its circumferential surface, the active sleeve (43) being provided with a convex column (431) extending in its radial direction on its inner circumferential surface, the convex column (431) being slidably matched with the driving arc groove (421); The driving arc grooves (421) are distributed on the circumferential surface of the fixing rod (42) along the circumferential direction; A connecting cylinder (432) fixedly connected to the movable mold (2) is provided at one end of the active sleeve (43); a mounting groove extending radially thereof is provided at the inner end of the active sleeve (43); a fitting block (433) is provided at one end of the convex column (431); the fitting block (433) is installed in the mounting groove; an external thread sleeve (434) threadably connected to the active sleeve (43) is provided at the inner end of the active sleeve (43); the external thread sleeve (434) abuts against one end of the fitting block (433) to prevent the fitting block (433) from being separated from the mounting groove; A driving column (31) coaxial with the threaded column (3) and penetrating the movable mold (2) is disposed at one end of the threaded column (3). The elastic torque connector (5) comprises a driven sleeve (51) coaxially rotatably disposed on the driving column (31), and a torque energy storage component disposed between the inner circumferential surface of the driven sleeve (51) and the circumferential surface of the driving column (31). The driven sleeve (51) is transmission-connected to the active sleeve (43). When the mold is separated, the rotational torque of the driven sleeve (51) is transmitted to the driving column (31) by the torque energy storage component.

2. The internal thread plastic gear injection mold according to claim 1, characterized in that: The torque energy storage assembly comprises a sliding ring (521) and an elastic element (522); the inner circumferential surface of the driven sleeve (51) is provided with a driven arc groove (511); the sliding ring (521) is axially fitted and slidably arranged on the driving column (31); the outer circumferential surface of the sliding ring (521) is provided with a guide column (523) extending in its radial direction; the guide column (523) extends into the driven arc groove (511) and slidably cooperates with the driven arc groove (511); the elastic element (522) is arranged between the inner circumferential surface of the driven sleeve (51) and the circumferential surface of the driving column (31); when the driven sleeve (51) rotates, the sliding ring (521) slides in its axial direction and compresses the elastic element (522).

3. The internal thread plastic gear injection mold according to claim 2, characterized in that: Positioning rings (32) are provided at both ends of the driving column (31), and the elastic element (522) and the sliding ring (521) are located between the two positioning rings (32).

4. The internal thread plastic gear injection mold according to claim 3, characterized in that: Step grooves are provided at both ends of the inner circumferential surface of the driven sleeve (51), and the step grooves at both ends of the driven sleeve (51) abut against opposite ends of two positioning rings (32) respectively.

5. An internal thread plastic gear injection mold according to any one of claims 1 to 4, characterized in that: The torque multiplier (6) comprises a driving gear (61), a linkage gear (62) and a driven gear (63) of successively decreasing diameters; the driving gear (61) is coaxially fixedly arranged on a driving sleeve (43); the linkage gear (62) is rotatably arranged in a movable mold (2); the driven gear (63) is coaxially fixedly arranged on a driven sleeve (51); and the driving gear (61), the linkage gear (62) and the driven gear (63) are meshed in sequence.

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