Injection molding die for profile seal

Abstract

The present application relates to injection molding technical field, disclose a kind of injection molding mold of special-shaped sealing ring, including fixed mould, several annular arrays are arranged in the guide pillar of fixed mould inner wall, jointly arranged in the movable mould of guide pillar far from fixed mould one end, still include the separating mechanism of being arranged in movable mould close to fixed mould one side;Separating mechanism includes the die insert one of being arranged in movable mould close to fixed mould one side, the die insert two of being arranged in fixed mould close to movable mould one side, the workpiece of being arranged in die insert one close to fixed mould one side, the support plate of being arranged in movable mould bottom, the support of being arranged in support plate far from movable mould one side, the tension spring of being arranged in the middle part of support plate inner side, the two ends of tension spring are respectively with support and support sleeve connection, the connecting plate of being arranged in support inner side, annular groove is opened in the connecting plate far from fixed mould one side, cutter is arranged in annular groove inner wall, rubber ring is sleeved in the outside of cutter.Combining blanking process and fly edge process by setting separating mechanism, improve production efficiency.

Description

Technical Field

[0001] This invention relates to the field of injection molding technology, and in particular to an injection molding mold for an irregularly shaped sealing ring. Background Technology

[0002] As a sealing element with a complex cross-sectional shape, irregularly shaped sealing rings are widely used in aerospace, automotive manufacturing, and precision hydraulic systems. Injection molding dies play a crucial role in determining the performance and precision of the product during its manufacturing process. Firstly, they enable the precise molding of complex structures. Irregularly shaped sealing rings have special geometric cross-sections, such as star-shaped, V-shaped, and U-shaped ones. Through high-precision cavity design, the mold ensures that these geometric features are accurately replicated. The fitting accuracy between the mold core and cavity directly determines the dimensional and positional tolerances of the sealing ring, ensuring interchangeability and sealing reliability during assembly. Secondly, the mold plays a role in optimizing material flow and weld quality. The internal runner system and gate location guide the high-temperature molten rubber or plastic to uniformly fill the cavity. Mold design must avoid air bubbles, insufficient material, or weld lines during material flow. A reasonable mold structure ensures that the material is tightly fused under high pressure, improving the density and physical and mechanical strength of the sealing ring. Finally, the temperature control and venting systems equipped in the mold improve production efficiency and quality stability. Precise temperature control ensures that the rubber compound is molded at the optimal vulcanization temperature, preventing over-vulcanization or under-vulcanization. The venting design removes gas from the cavity, avoiding defects on the product surface. This shortens the molding cycle, enables large-scale production, and ensures the consistency of product performance.

[0003] Traditional injection molds are widely used in the production of sealing rings, but due to limitations in their structure and working principle, they often present some unavoidable problems. In particular, the need for a separate deflashing process after demolding severely restricts production efficiency. Irregularly shaped sealing rings, due to their irregular geometry and complex cross-sectional structure, often require mold designs involving multi-directional parting and complex core-pulling mechanisms. To ensure sufficient flow of the rubber material within the cavity and smooth venting, the mold parting surface inevitably has tiny gaps, causing the rubber material to easily overflow during molding, forming unevenly thick and varied deflashes. These deflashes are often tightly attached to the sealing surface of the workpiece or located in hard-to-reach grooves, and cannot automatically break off when the mold opens, requiring a separate subsequent trimming process. In the current production system, after injection molding and vulcanization, the workpiece needs to be cooled, removed, and transferred to the trimming station, where it undergoes secondary processing via manual shearing, freeze trimming, or punching equipment. This fragmented process not only significantly increases non-productive auxiliary time and disrupts the rhythm of continuous production, but also introduces additional labor costs and equipment energy consumption. Manual trimming, limited by the operator's skill level, is prone to over-trimming or leaving burrs, leading to dimensional errors or seal failures, thus reducing yield. Mechanical trimming, on the other hand, requires specialized tools or fixtures for specific products, resulting in long mold changeover and adjustment cycles and insufficient flexibility. This production mode, which necessitates machine shutdown, transfer, and separate trimming, makes burr removal a bottleneck restricting capacity release, resulting in low output per unit time and failing to meet the demands of large-scale, intensive modern industrial production. Summary of the Invention

[0004] In view of the problem that existing injection molds cannot remove flash from workpieces, an injection molding mold for irregularly shaped sealing rings is proposed.

[0005] Its purpose is to enable the mold to remove flash from the workpiece.

[0006] The technical solution of the present invention is an injection molding mold for an irregularly shaped sealing ring, including a fixed mold, a plurality of guide pillars arranged in an annular array on the inner wall of the fixed mold, a moving mold arranged on the end of the guide pillars away from the fixed mold, and a separation mechanism arranged on the side of the moving mold close to the fixed mold. The separation mechanism includes a mold core one disposed on the side of the moving mold near the fixed mold, a mold core two disposed on the side of the fixed mold near the moving mold, a workpiece disposed on the side of the mold core one near the fixed mold, a support plate disposed at the bottom of the moving mold, a bracket disposed on the side of the support plate away from the moving mold, a tension spring disposed in the middle of the inner side of the support plate, with both ends of the tension spring respectively sleeved on the support plate and the bracket, a connecting plate disposed on the inner side of the bracket, an annular groove opened on the side of the connecting plate away from the fixed mold, a cutter disposed on the inner wall of the annular groove, a rubber ring sleeved on the outer side of the cutter, the rubber ring being fixedly connected to the inner wall of the annular groove away from the fixed mold, a plurality of screws arranged in annular array on the edge of the connecting plate, a drive unit disposed at the bottom of the fixed mold, and a demolding unit disposed inside the mold core one.

[0007] Furthermore, the connecting plate has a ring array of several round holes at its edge, and the bracket has a ring array of several screw holes coaxial with the round holes at its edge. The screws pass through the corresponding round holes and are threadedly connected to the coaxial screw holes.

[0008] Furthermore, the cutter has a cutting edge on the side near the fixed mold, the shape of which is similar to that of the workpiece, and a retaining ring is provided on the outer side of the cutter near the rubber ring, the retaining ring abutting against the rubber ring.

[0009] Furthermore, the drive unit includes a crossbar disposed at the bottom of the fixed mold, a stop block disposed at the top of the crossbar, and a spring plate disposed at the bottom of the stop block, with the two ends of the spring plate being fixedly connected to the stop block and the crossbar, respectively.

[0010] Furthermore, the bottom of the stop block is provided with a movable groove, and the top of the crossbar is rotatably connected to the movable groove.

[0011] Furthermore, the demolding unit includes a movable cavity symmetrically opened inside the mold core, a rotating arm disposed inside the cavity, an ejector rod disposed at one end of the rotating arm near the center of the mold core, a return spring sleeved on the outside of the ejector rod, the two ends of the return spring being fixedly connected to the ejector rod and the movable cavity respectively, and a short shaft symmetrically disposed on the connecting plate near the fixed mold side.

[0012] Furthermore, a limit shaft is symmetrically provided in the middle of the rotating arm away from the top rod, and the inner wall of the movable cavity is rotatably connected to the limit shaft.

[0013] Furthermore, the mold core has symmetrically provided insertion holes on the side near the fixed mold, the insertion holes are connected to the corresponding movable cavities, and the diameter of the insertion holes is larger than the diameter of the short shaft.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up a separation mechanism, the blanking process and the deburring process are combined to improve production efficiency. The mechanism performs the deburring and workpiece separation actions simultaneously during the mold opening process, which changes the traditional step-by-step operation mode. This design eliminates the waiting time for transfer between processes, reduces equipment occupation and manual intervention. Through the linkage of the mechanical structure, the continuity of the deburring and blanking actions is ensured, the production cycle of a single product is shortened, the automation level of the production line and the overall output efficiency are improved, and efficient integrated production is achieved.

[0015] 2. By setting up a drive unit, the separation mechanism is driven by the power of mold opening, eliminating the need for an additional power source. The unit utilizes the linear motion of the mold opening to convert it into the rotary cutting action of the separation mechanism through mechanical contact. This design eliminates the need for additional motors or hydraulic devices, reduces the manufacturing and maintenance costs of the mold, simplifies the overall structural layout, and uses the mold opening stroke as the power input to achieve rational energy utilization, reduce energy consumption, and enable the mold to complete complex processing actions without external power.

[0016] 3. By setting up a demolding unit, the separation effect of the cutter is optimized by utilizing the displacement of the workpiece during demolding. When the cutter is in action, the unit drives the workpiece to move. The relative motion generated by this displacement changes the cutting force state, and the auxiliary cutter completely disconnects the flash from the product, avoiding incomplete cutting caused by material extension. The movement of the workpiece promotes the separation of waste and finished product, preventing flash residue or jamming. Through the mechanical linkage of displacement, the quality of the cutting section is improved, and the coordinated stability of demolding and separation actions is guaranteed. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the entire invention; Figure 2 This is a schematic diagram of the fixed mold structure of the present invention; Figure 3 This is a schematic diagram showing the relative positions of the support plate and the moving mold in this invention; Figure 4 This is a schematic diagram of the connection between the tension spring and the support plate of the present invention; Figure 5 This is a schematic diagram of the overall structure of the support frame of the present invention; Figure 6 This is a schematic diagram showing the connection between the connecting plate and the cutter of the present invention; Figure 7 This is a schematic diagram of the cutting blade structure of the present invention; Figure 8 This is a schematic diagram of the connection between the connecting plate and the short shaft of the present invention; Figure 9 This is a schematic diagram of the overall structure of the drive unit of the present invention; Figure 10This is a schematic diagram of the internal structure of the stop block of the present invention; Figure 11 This is a schematic diagram showing the connection between the workpiece and the mold core according to the present invention; Figure 12 This is a schematic diagram of the spiral arm structure of the present invention.

[0018] In the picture: 1. Fixed mold; 2. Guide pillar; 3. Moving mold; 4. Separation mechanism; 41. Mold core one; 42. Mold core two; 43. Workpiece; 44. Support plate; 45. Bracket; 46. Tension spring; 47. Connecting plate; 48. Annular groove; 49. Cutter; 410. Rubber ring; 411. Screw; 412. Crossbar; 413. Stop block; 414. Spring; 415. Movable cavity; 416. Rotary arm; 417. Ejector rod; 418. Return spring; 419. Short shaft. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0020] Example 1, referring to Figures 1-12 This invention provides an injection molding die for an irregularly shaped sealing ring, comprising a fixed mold 1, a plurality of guide pillars 2 arranged in a ring array and fixedly connected to the inner wall of the fixed mold 1, a movable mold 3 slidably connected to the guide pillars 2 at the end away from the fixed mold 1, and a separation mechanism 4 installed on the side of the movable mold 3 near the fixed mold 1; the separation mechanism 4 includes a mold core 41 fixedly connected to the side of the movable mold 3 near the fixed mold 1, a mold core 42 fixedly connected to the side of the fixed mold 1 near the movable mold 1, a workpiece 43 sleeved on the side of the mold core 41 near the fixed mold 1, a support plate 44 fixedly connected to the bottom of the movable mold 3, and a rotatably connected to the support plate 44 at the end away from the fixed mold 1. A bracket 45 on one side of mold 3 is fitted with a tension spring 46 in the middle of the inner side of the support plate 44. The two ends of the tension spring 46 are respectively fitted with the support plate 44 and the bracket 45. A connecting plate 47 is fixedly connected to the inner side of the bracket 45. An annular groove 48 is opened on the side of the connecting plate 47 away from the fixed mold 1. A cutter 49 is slidably connected to the inner wall of the annular groove 48. A rubber ring 410 is fitted on the outer side of the cutter 49. The rubber ring 410 is fixedly connected to the inner wall of the annular groove 48 away from the fixed mold 1. Several screws 411 are rotatably connected to the edge of the connecting plate 47 in an annular array. A drive unit is assembled at the bottom of the fixed mold 1. A demolding unit is assembled inside the mold core 41.

[0021] Specifically, after injection molding, the moving mold 3 is moved away from the fixed mold 1. Constrained by the guide pillar 2, the moving mold 3 moves along a straight line. Simultaneously, the moving mold 3 moves the support plate 44, which in turn moves the bracket 45. Due to the tension of the tension spring 46, the bracket 45 remains relatively stationary with the support plate 44 when not interfered with by external forces. After moving a certain distance away from the fixed mold 1 with the moving mold 3, the bracket 45 contacts the drive unit. Under the action of the drive unit, the bracket 45 rotates towards the moving mold 3, and the tension spring 46 stores force. Simultaneously, the bracket 45 moves the connecting plate 47, which in turn moves the cutter 49. After rotating a certain angle, the cutter 49's cutting edge engages with the outer edge of the workpiece 43 and contacts the parting surface of the mold core 41, thus contacting the edge of the workpiece 43. The flash is trimmed, at which point the cutter 49 stops moving, while the bracket 45 and connecting plate 47 continue to move. The cutter 49 slides along the groove, and the connecting plate 47 squeezes the rubber ring 410 to cause it to deform elastically. The rubber ring 410 transmits the force from the connecting plate 47 to the cutter 49, increasing the cutting force of the cutter 49. When the bracket 45 moves to a point where it is no longer in contact with the drive unit, the bracket 45 resets under the action of the tension spring 46. After the bracket 45 resets, the cutter 49 no longer contacts the mold core 41. At this time, the rubber ring 410 undergoes elastic deformation, causing the cutter 49 to reset. When manufacturing workpieces 43 of different shapes, the connecting plate 47 is removed by unscrewing all the screws 411, and a cutter 49 and its corresponding connecting plate 47 adapted to the shape of different workpieces 43 are installed. Then, the screws 411 are tightened to make the mold adapt to the production requirements of different workpieces 43.

[0022] Reference Figures 5-7 The connecting plate 47 has a ring array of several round holes at its edge, and the bracket 45 has a ring array of several screw holes coaxial with the round holes at its edge. The screw 411 passes through the corresponding round hole and is threadedly connected to the coaxial screw hole.

[0023] Specifically, the screw 411 passes through the round hole and connects to the corresponding screw hole. By switching the connecting plate 47 and the cutter 49 of different specifications, it can adapt to the production needs of workpieces 43 of different shapes.

[0024] Reference Figures 3-8 The cutting blade 49 has a cutting edge on the side near the fixed mold 1. The shape of the cutting edge is similar to that of the workpiece 43. A retaining ring is provided on the outer side of the cutting blade 49 near the rubber ring 410. The retaining ring abuts against the rubber ring 410.

[0025] Specifically, the cutting edge matches the shape of the workpiece 43, and the cutting edge removes the flash on the outside of the workpiece 43 by cooperating with the parting surface of the mold core 41.

[0026] Reference Figures 1-12The drive unit includes a crossbar 412 fixedly connected to the bottom of the fixed mold 1, a stop block 413 rotatably connected to the top of the crossbar 412, and a spring 414 fixedly connected to the bottom of the stop block 413. The two ends of the spring 414 are fixedly connected to the stop block 413 and the crossbar 412, respectively.

[0027] Specifically, after the fixed mold 1 moves a certain distance away from the fixed mold 1, it will cause the bracket 45 to contact the stop block 413. The stop block 413 is constrained by the crossbar 412 and only has the freedom to rotate towards the fixed mold 1. At this time, it will squeeze the bracket 45 and make the bracket 45 rotate. When the moving mold 3 moves towards the fixed mold 1, the preload of the tension spring 46 is stronger than the preload of the spring plate 414. The bracket 45 will squeeze the stop block 413 and make the stop block 413 rotate towards the fixed mold 1. While the stop block 413 rotates, the spring plate 414 stores force. When it moves to a point where it is no longer in contact with the stop block 413, the stop block 413 resets under the action of the spring plate 414.

[0028] Reference Figure 9 and Figure 10 The bottom of the stop block 413 is provided with a movable groove, and the top of the crossbar 412 is rotatably connected to the movable groove.

[0029] Specifically, the stop block 413 is connected to the crossbar 412 through a movable groove. The movable groove and the crossbar 412 constrain the motion freedom of the stop block 413, so that in the initial state, it can only rotate in the direction of the fixed mold 1.

[0030] Example 2, refer to Figures 1-12 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the demolding unit includes a movable cavity 415 symmetrically opened inside the mold core 41, a rotating arm 416 rotatably connected inside the cavity, a push rod 417 abutting against one end of the rotating arm 416 near the center of the mold core 41, a return spring 418 sleeved on the outside of the push rod 417, the two ends of the return spring 418 being fixedly connected to the push rod 417 and the movable cavity 415 respectively, and a short shaft 419 symmetrically fixedly connected to the connecting plate 47 near the fixed mold 1.

[0031] Specifically, while the bracket 45 drives the connecting plate 47 to rotate toward the moving mold 3, the connecting plate 47 simultaneously drives the short shaft 419 to move. After the connecting plate 47 rotates to its maximum stroke, the short shaft 419 presses against the corresponding rotating arm 416 to make it rotate. As the rotating arm 416 rotates, it drives the ejector rod 417, causing the ejector rod 417 to extend from inside the mold core 41 and eject the workpiece 43. As the ejector rod 417 extends, it causes the return spring 418 to store force. During this process, the cutter 49 first contacts the mold core 41. 1. After the bracket 45 contacts and deforms the rubber ring 410, the short shaft 419 triggers the rotating arm 416 to eject the workpiece 43. The displacement generated when the workpiece 43 is ejected helps the cutter 49 remove the flash, and the blanking is completed in the process. When the bracket 45 and the connecting plate 47 are reset, they drive the short shaft 419 to reset. At this time, the reset spring 418 causes the ejector rod 417 to retract into the mold core 41. While the ejector rod 417 retracts, it squeezes the rotating arm 416 to restore it to its initial state.

[0032] Reference Figure 11 and Figure 12 A limit shaft is symmetrically provided in the middle of the rotating arm 416 away from the top rod 417, and the inner wall of the movable cavity 415 is rotatably connected to the limit shaft.

[0033] Specifically, the limiting shaft constrains the rotating arm 416, so that the rotating arm 416 can only rotate around the limiting shaft.

[0034] Reference Figures 11-12 The mold core 41 has symmetrically opened insertion holes on the side near the fixed mold 1. The insertion holes are connected to the corresponding movable cavity 415. The diameter of the insertion holes is larger than the diameter of the short shaft 419.

[0035] Specifically, the short shaft 419 enters the movable cavity 415 through the insertion hole and squeezes the rotating arm 416, thereby causing the rotating arm 416 to rotate. The insertion hole and the annular groove 48 both have a certain curvature in the horizontal direction to adapt to the rotation trajectory of the bracket 45. The rest of the structure is the same as that of Embodiment 1.

[0036] Based on embodiments 1-2, the working principle of this invention is as follows: During use, injection molding is first performed. After the workpiece 43 has cooled, the moving mold 3 moves along the guide post 2 away from the fixed mold 1. As the moving mold 3 moves, it drives the mold core 3, support plate 44, and workpiece 43 to move synchronously. The support plate 44 drives the bracket 45 to move. When the bracket 45 moves to contact the stop block 413 of the drive unit, the bracket 45, blocked by the stop block 413, rotates relative to the support plate 44. Simultaneously, the tension spring 46 stores force. This rotational motion drives the connecting plate 47 to swing, driving the cutting edge of the cutter 49 to cut into the outer edge of the workpiece 43 and cooperate with the parting surface of the mold core 41 to trim the flash. As the bracket 45 continues to rotate, the cutter 49 stops moving due to the blockage of the mold core 41. The connecting plate 47 continues to move, squeezing the rubber ring 410 to produce elastic deformation, thereby increasing the cutting pressure of the cutter 49 and ensuring thorough removal of the flash. During the flash trimming process, the rotation of the connecting plate 47 synchronously drives the short shaft 41. 9 is inserted into the insertion hole of mold core 41. When the connecting plate 47 rotates to its maximum stroke, the short shaft 419 presses the rotating arm 416 in the movable cavity 415, causing it to rotate around the limiting shaft. The rotating arm 416 drives the ejector rod 417 to overcome the elastic force of the return spring 418 and extend from inside the mold core 41, ejecting the workpiece 43. The displacement of the workpiece 43 assists the cutter 49 in removing residual flash and realizes automatic unloading. After demolding and trimming are completed, the moving mold 3 moves towards the fixed mold 1 to reset, and the support plate 44 follows. When the moving mold 3 moves back, the tension spring 46 releases energy, pulling the bracket 45 to rotate in the opposite direction to the support plate 44 and reset. The connecting plate 47 is reset accordingly. The rubber ring 410 releases its elastic force to assist the cutter 49 in returning to its position. At the same time, the short shaft 419 exits the movable cavity 415. The ejector rod 417 retracts into the mold core 41 under the action of the reset spring 418 and squeezes the rotating arm 416 to return to its initial state. If it is necessary to produce workpieces 43 of different specifications, simply unscrew the screw 411 and replace the appropriate connecting plate 47 and cutter 49.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An injection molding die for an irregularly shaped sealing ring, comprising a fixed mold (1), a plurality of guide pillars (2) arranged in an annular array on the inner wall of the fixed mold (1), and a moving mold (3) arranged at one end of the guide pillars (2) away from the fixed mold (1), characterized in that: It also includes a separation mechanism (4) located on the side of the moving mold (3) close to the fixed mold (1); The separation mechanism (4) includes a mold core one (41) disposed on the side of the moving mold (3) near the fixed mold (1), a mold core two (42) disposed on the side of the fixed mold (1) near the moving mold (3), a workpiece (43) disposed on the side of the mold core one (41) near the fixed mold (1), a support plate (44) disposed at the bottom of the moving mold (3), a bracket (45) disposed on the side of the support plate (44) away from the moving mold (3), and a tension spring (46) disposed in the middle of the inner side of the support plate (44). The two ends of the tension spring (46) are respectively sleeved with the support plate (44) and the bracket (45). A connecting plate (47) is set inside the bracket (45), an annular groove (48) is opened on the side of the connecting plate (47) away from the fixed mold (1), a cutter (49) is set on the inner wall of the annular groove (48), a rubber ring (410) is sleeved on the outside of the cutter (49), the rubber ring (410) is fixedly connected to the inner wall of the annular groove (48) away from the fixed mold (1), a number of screws (411) arranged in annular array on the edge of the connecting plate (47), a drive unit set at the bottom of the fixed mold (1), and a demolding unit set inside the mold core (41).

2. The injection molding die for the irregularly shaped sealing ring according to claim 1, characterized in that: The connecting plate (47) has a ring array of several round holes at its edge, and the bracket (45) has a ring array of several screw holes coaxial with the round holes at its edge. The screw (411) passes through the corresponding round hole and is threadedly connected to the coaxial screw hole.

3. The injection molding die for the irregularly shaped sealing ring according to claim 1, characterized in that: The cutter (49) has a cutting edge on the side near the fixed mold (1). The shape of the cutting edge is similar to that of the workpiece (43). A retaining ring is provided on the outside of the cutter (49) near the rubber ring (410). The retaining ring abuts against the rubber ring (410).

4. The injection molding die for the irregularly shaped sealing ring according to claim 1, characterized in that: The drive unit includes a crossbar (412) disposed at the bottom of the fixed mold (1), a stop block (413) disposed at the top of the crossbar (412), and a spring (414) disposed at the bottom of the stop block (413). The two ends of the spring (414) are fixedly connected to the stop block (413) and the crossbar (412) respectively.

5. The injection molding die for the irregularly shaped sealing ring according to claim 4, characterized in that: The bottom of the stop (413) is provided with a movable groove, and the top of the crossbar (412) is rotatably connected to the movable groove.

6. The injection molding die for the irregularly shaped sealing ring according to claim 1, characterized in that: The demolding unit includes a movable cavity (415) symmetrically opened inside the mold core (41), a rotating arm (416) set inside the cavity, a push rod (417) set at one end of the rotating arm (416) near the center of the mold core (41), a return spring (418) sleeved on the outside of the push rod (417), the two ends of the return spring (418) being fixedly connected to the push rod (417) and the movable cavity (415) respectively, and a short shaft (419) symmetrically arranged on the side of the connecting plate (47) near the fixed mold (1).

7. The injection molding die for the irregularly shaped sealing ring according to claim 6, characterized in that: The limiting shaft is symmetrically provided in the middle of the rotating arm (416) away from the top rod (417), and the inner wall of the movable cavity (415) is rotatably connected to the limiting shaft.

8. The injection molding die for the irregularly shaped sealing ring according to claim 6, characterized in that: The mold core (41) has symmetrically opened insertion holes on the side close to the fixed mold (1), and the insertion holes are connected to the corresponding movable cavity (415). The diameter of the insertion holes is larger than the diameter of the short shaft (419).

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