Gas assisted synchronous ejection mechanism

Abstract

The application provides a gas-assisted synchronous ejection mechanism, and belongs to the technical field of machinery. The gas-assisted synchronous ejection mechanism solves the problem that the existing gas pressure-assisted demolding is difficult to be synchronized with the ejection structure. The gas-assisted synchronous ejection mechanism is arranged at a mold with a cavity, and comprises an ejector for demolding and a gas channel capable of conveying gas. The outlet of the gas channel is communicated to the cavity. An opening and closing part capable of blocking the gas channel is arranged in the gas channel. The outer end of the opening and closing part extends out of the gas channel and abuts against or is connected to the ejector. When the ejector moves, the opening and closing part can synchronously move with the ejector and make the gas channel conductive. The gas-assisted synchronous ejection mechanism has the advantage of good synchronism.

Description

Technical Field

[0001] This invention belongs to the field of mechanical technology and relates to a gas-assisted synchronous ejection mechanism, particularly a gas-assisted synchronous ejection mechanism applied to a taillight mask retroreflector. Background Technology

[0002] For plastic products, injection molding is often used. During injection molding, the moving mold and the fixed mold combine to form a cavity, and material is injected into the cavity to fill it. After injection molding, ejector pins are used to eject the finished product to achieve demolding. However, for some parts with complex surface structures, such as the retroreflectors on the surface of automotive taillight covers, which are optical prisms with large mold-closing forces and are prone to being sucked into the mold cavity, it is difficult to achieve rapid demolding using only existing ejector blocks, ejector pins, and other ejection systems.

[0003] To address this, an injection mold with a combined pneumatic and mechanical ejection mechanism was designed and a Chinese patent was applied for, with application number 201720244677.9 and publication number CN206536783U. This injection mold includes a male mold core, a slider, a female mold core, an ejector pin, and a pushing device for moving the ejector pin along the mold opening direction. The male mold core has a through hole, and the ejector pin is placed within the through hole. The top of the through hole in the male mold core has a trapezoidal head. The ejector pin includes a pin head and a pin body. The pin head is trapezoidal and can fit against the trapezoidal head of the through hole. The ejector pin is configured to slide relative to the male mold core along the mold opening direction. A clearance groove is provided between the through hole and the pin body. The part of the pin body near the pin head has an venting groove, which communicates with the clearance groove. The male mold core has an air inlet, which communicates with the clearance groove. A sealing element is provided between the bottom through hole of the male mold core and the ejector pin. This injection mold assists in demolding by injecting air into the mold, which can effectively improve the demolding rate.

[0004] However, although air pressure demolding is used to assist ejection structures such as ejector pins or ejector plates, the two are independent ejection mechanisms. If the air intake is faster than the ejection structure, the middle of the product is easily deformed or even cracked by the air pressure impact. If the air intake time is delayed, demolding can only be carried out by the ejection structure, and the air pressure cannot play an auxiliary ejection role. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the prior art by proposing a gas-assisted synchronous ejection mechanism, which solves the problem that existing pneumatic-assisted demolding is difficult to synchronize with the ejection structure.

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

[0007] A gas-assisted synchronous ejection mechanism is provided for installation at a mold with a cavity, including an ejector for demolding and an air passage for conveying gas, wherein the outlet of the air passage is connected to the cavity, characterized in that an opening and closing part is provided in the air passage to block the air passage, the outer end of the opening and closing part extends out of the air passage and abuts against or connects to the ejector, and when the ejector moves, the opening and closing part can move synchronously with the ejector and open the air passage.

[0008] In use, this gas-assisted synchronous ejection mechanism connects the air inlet to the air source and engages the ejector with the drive unit. By default, the ejector is in its initial position and does not eject, while the opening and closing mechanism blocks the air passage. When demolding is required after injection molding, the drive unit drives the ejector to eject outwards, removing the finished product from the mold cavity. Simultaneously, the opening and closing mechanism moves synchronously with the ejector, opening the air passage. Gas from the air source flows along the air passage into the cavity, also acting on the finished product inside the cavity for assisted demolding. Here, the ejection action of the ejector and the movement of the opening and closing mechanism are synchronized, allowing the ejection of the ejector and the gas-assisted demolding to occur simultaneously, resulting in good demolding effect and high demolding efficiency.

[0009] In the aforementioned gas-assisted synchronous ejection mechanism, the mechanism further includes a control component. The air passage includes an air inlet, an air outlet, and a connecting groove, all located on the control component. The outlet of the air inlet and the inlet of the air outlet are both connected to the bottom of the connecting groove. The opening and closing part is disposed within the connecting groove, and when it moves towards the bottom of the groove, it can block the air passage. By placing the outlet of the air inlet and the inlet of the air outlet at the bottom of the connecting groove, when the opening and closing part moves away from the bottom of the groove with the ejector, the air inlet and the air outlet can connect immediately, resulting in a fast response and good synchronization, thus improving the assisted demolding effect. Furthermore, the outlet of the air inlet and the inlet of the air outlet are located on the same side of the opening and closing part, facilitating the sealing of the opening and closing part.

[0010] In the aforementioned gas-assisted synchronous ejection mechanism, an elastic element is provided between the opening / closing part and the bottom of the connecting groove. The outer end of the opening / closing part can abut against the ejector under the elastic force of the elastic element. The elastic force of the elastic element causes the opening / closing part to tend to move away from the bottom of the connecting groove, thus providing clearance space when the ejector ejects, allowing the opening / closing part to move outward and connect the air inlet and outlet. Conversely, the ejector resets in the opposite direction, pushing the opening / closing part to compress the elastic element and reset, re-blocking the air passage. This mechanism offers a fast response time, and the two structures are relatively independent with minimal interference, avoiding jamming and resulting in a more stable and better demolding effect.

[0011] In the aforementioned gas-assisted synchronous ejection mechanism, a sealing ring one is provided between the outer side of the opening / closing part and the side wall of the connecting groove. A recessed spring hole is located in the center of the bottom surface of the opening / closing part, and the elastic element is disposed within the spring hole. A sealing ring two is provided between the bottom of the opening / closing part and the bottom surface of the connecting groove, surrounding the spring hole. The outlet of the air inlet and the inlet of the air outlet are offset from the spring hole. When the opening / closing part blocks the air passage, the elastic element is sealed within the spring hole by the sealing ring two, while the air inlet and outlet are isolated between the sealing ring one and the sealing ring two. This prevents the elastic element from being continuously subjected to air pressure when the air passage is blocked, thus avoiding affecting its service life and ensuring the demolding effect and stability.

[0012] In the aforementioned gas-assisted synchronous ejection mechanism, a ring-shaped end cap is fixed to one side of the opening of the communicating groove on the control component. The inner diameter of the end cap is smaller than the opening width of the communicating groove. The outer end of the opening / closing part is columnar and passes through the inner hole of the end cap. The outer side of the opening / closing part also has a shoulder. When the opening / closing part moves outward under the elastic force of the elastic element, the shoulder can abut against the end cap. By blocking the opening / closing part with the end cap, the stroke of the opening / closing part is shortened. The cooperation between the columnar structure at the outer end of the opening / closing part and the inner hole of the end cap can guide the movement of the opening / closing part, ensuring smooth movement of the opening / closing part and effective sealing, thereby ensuring the demolding effect and stability.

[0013] In the aforementioned gas-assisted synchronous ejection mechanism, the mold includes a moving mold frame, a moving mold insert fixed on the moving mold frame, and a retroreflector insert. The moving mold insert has a recessed connecting groove on the side away from the moving mold frame. The retroreflector insert is fixed in the connecting groove. The sides of the retroreflector insert and the moving mold insert away from the moving mold frame are used to form the aforementioned cavity with the stationary mold. The air passage also includes a vent hole connected to the vent hole and an annular vent gap formed between the outer side of the retroreflector insert and the side wall of the connecting groove. The vent hole communicates with the bottom of the connecting groove, and the vent gap communicates with the vent hole. The moving mold insert is a single molded part. The retroreflector insert is specifically fixed to the moving mold insert for retroreflectors with particularly complex shapes. It works in conjunction with the moving mold insert and the stationary mold to form the automotive taillight cover. Here, the bottom of the retroreflector insert blocks the gas, dispersing it to the vent gap and delivering it into the cavity in a ring-like manner. This ensures the gas acts on a surface rather than a single point, guaranteeing effective gas-assisted demolding. To avoid the vent gap affecting product molding, its size is relatively small, with the dimensions designed to minimize its impact on the final product molding.

[0014] In the above-mentioned gas-assisted synchronous ejection mechanism, a plurality of through holes are provided in the retroreflector insert, the plurality of through holes are arranged around the vent hole, one end of the plurality of through holes is connected to the vent hole, and the other end of the plurality of through holes is connected to the gas outlet gap.

[0015] In another scenario, in the aforementioned gas-assisted synchronous ejection mechanism, the bottom surface of the connecting groove has several recessed, elongated gas distribution grooves. These grooves are arranged around the outlet of the vent hole, with one end connected to the vent hole and the other end connected to the outlet gap. A gas distribution block is fixed on the moving mold insert at the outlet of the vent hole. One end of the gas distribution block extends into the outlet of the vent hole, and the outer surface of that end is conical. The diameter of the conical surface gradually increases from the inlet to the outlet of the vent hole. The outer side of the other end of the gas distribution block has a protruding, annular gas guide. The end face of the gas guide facing the conical surface is an arc surface, and the position of the arc surface away from the center of the gas distribution block corresponds to the position of the gas distribution groove. The diameter of the vent hole gradually decreases from the inlet to the outlet. The gradually decreasing diameter of the vent holes continuously increases the air pressure of the delivered gas, preventing insufficient air pressure when the gas reaches the cavity. The gas distribution blocks with conical and arc surfaces better divert and guide the gas, ensuring smooth gas delivery, reducing air pressure loss, and thus ensuring the stability and effectiveness of the assisted demolding. Furthermore, the gas delivery through several recessed gas distribution grooves at the bottom of the connecting groove ensures the support of the moving mold insert for the retroreflector insert.

[0016] In the aforementioned gas-assisted synchronous ejection mechanism, the ejector has a recessed locking slot on the side corresponding to the opening and closing part. The opening of the locking slot has a square cross-section, and the inner end of the locking slot has a circular cross-section with a diameter greater than the width of the opening. The opening and closing part is cylindrical, and the outer end of the opening and closing part has a locking part. The outer side of the locking part protrudes from the outer side of the opening and closing part at other positions, and the cross-sectional shape and size of the locking part match the cross-sectional shape and size of the opening. A rod-shaped handle is radially threaded to the outer end of the opening and closing part adjacent to the locking part. In use, insert the locking part of the opening and closing mechanism into the lock slot at the corresponding position and angle, so that the locking part passes through the opening of the lock slot and extends into the inner end of the lock slot. Turn the handle to rotate the opening and closing mechanism and the locking part until the angle between the locking part and the opening of the lock slot is misaligned. The opening and closing mechanism is then locked onto the ejector and can move back and forth synchronously with the ejector. There is no need to worry about elastic fatigue of the elastic component after long-term use. During installation, the operation is reversed to remove the opening and closing mechanism from the ejector. Both can be manufactured and installed separately, making installation relatively convenient. Similarly, the threaded handle can also be disassembled for easy manufacturing and installation.

[0017] Compared with existing technologies, the ejection action of the ejector and the movement of the opening and closing parts in this gas-assisted synchronous ejection mechanism are synchronized, so that the ejection of the ejector and the gas-assisted demolding can be carried out simultaneously, resulting in good demolding effect and high demolding efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the gas-assisted synchronous ejection mechanism.

[0019] Figure 2 This is a cross-sectional structural schematic diagram of Embodiment 1 of the gas-assisted synchronous ejection mechanism.

[0020] Figure 3 This is a cross-sectional structural diagram of the control component in Embodiment 1 of the gas-assisted synchronous ejection mechanism.

[0021] Figure 4 This is a cross-sectional view of the opening and closing part when it leaves the bottom of the communicating groove in Embodiment 1 of the gas-assisted synchronous ejection mechanism.

[0022] Figure 5 This is a cross-sectional structural diagram of the gas-assisted synchronous ejection mechanism when used in a mold.

[0023] In the diagram, 1. Mold; 11. Cavity; 12. Air passage; 121. Air outlet; 122. Air inlet; 123. Connecting groove; 124. Vent hole; 125. Air outlet gap; 126. Connecting hole; 13. Moving mold frame; 14. Moving mold insert; 15. Retroreflector insert; 2. Ejector; 21. Ejector plate; 22. Ejector rod; 23. Linkage plate; 3. Opening and closing part; 31. Spring hole; 32. Shoulder; 4. Control component; 5. Elastic component; 6. Sealing ring one; 7. Sealing ring two; 8. End cap; 9. Base plate; 10. Pressure gauge; 101. Air outlet pipe; 102. Air inlet pipe; 103. Flow controller; 104. Stationary mold. Detailed Implementation

[0024] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0025] Example 1

[0026] like Figure 5 As shown, this gas-assisted synchronous ejection mechanism is applied to mold 1. Mold 1 includes a moving mold and a stationary mold 104 arranged opposite to each other, forming a cavity 11 for product molding between the moving mold and the stationary mold 104. The moving mold includes a flat base plate 9, a moving mold frame 13 fixed to the upper side of the base plate 9, a moving mold insert 14 fixed to the upper side of the moving mold frame 13, and a retroreflector insert 15 fixed to the upper side of the moving mold insert 14.

[0027] For ease of understanding, the orientation shown in the attached diagram will be used as the standard for describing the structure and location below.

[0028] The moving mold insert 14 has a recessed connecting groove on its upper side. The retroreflector insert 15 is fixed in the connecting groove by fasteners and abuts against the bottom surface of the connecting groove. An annular venting gap 125 is formed between the outer side of the retroreflector insert 15 and the side wall of the connecting groove. The side of the retroreflector insert 15 and the moving mold insert 14 away from the moving mold frame 13 is used to form the cavity 11 with the stationary mold 104. One end of the venting gap 125 extends to the outer surface of the retroreflector insert 15 away from the moving mold frame 13, thereby communicating with the cavity 11. This gas-assisted synchronous ejection mechanism includes an ejector 2 for demolding and an air passage 12 for conveying gas. The air passage 12 includes the aforementioned venting gap 125, so the outlet of the air passage 12 communicates with the cavity 11.

[0029] like Figure 3 As shown, the ejector 2 includes a rod-shaped ejector rod 22, an ejector plate 21, and a linkage plate 23, both of which are flat. The linkage plate 23 is arranged parallel to the ejector plate 21 and fixed by fasteners. The ejector rod 22 is vertically connected to the side of the ejector plate 21 facing the linkage plate 23. Figure 1 As shown, the gas-assisted synchronous ejection mechanism also includes a block-shaped control component 4 and an air inlet pipe 102 and an air outlet pipe 101 connected to the control component 4.

[0030] The air passage 12 includes an air inlet 122, an air outlet 121, and a connecting groove 123, all of which are provided on the control component 4. The outlet of the air inlet 122 and the inlet of the air outlet 121 are both connected to the bottom of the connecting groove 123. The inlet of the air inlet 122 is connected to the air inlet pipe 102, and the outlet of the air outlet 121 is connected to the air outlet pipe 101. A flow controller 103 and a pressure gauge 10 are also connected to the air outlet pipe 101. The connecting groove 123 is cylindrical, and a cylindrical opening and closing part 3 is provided inside the connecting groove 123. When the opening and closing part 3 moves towards the bottom of the connecting groove 123, it can block the air passage 12.

[0031] In this embodiment, an annular sealing ring 6 is fixed to the outer side of the opening / closing part 3, and the outer side of the sealing ring 6 abuts against the side wall of the communicating groove 123 to form a seal. A recessed spring hole 31 is located at the center of the bottom surface of the opening / closing part 3, and a spring serving as an elastic element 5 is disposed within the spring hole 31. A second sealing ring 7 is fixed to the bottom of the opening / closing part 3, and the second sealing ring 7 is arranged around the spring hole 31. The lower side of the second sealing ring 7 abuts against the bottom surface of the communicating groove 123 to form a seal when the opening / closing part 3 moves towards the bottom of the communicating groove 123. The outlet of the air inlet 122 and the inlet of the air outlet 121 are both offset from the spring hole 31 and are symmetrically arranged on both sides of the spring hole 31.

[0032] An annular end cap 8 is fixed on one side of the opening of the connecting groove 123 on the control component 4. The inner diameter of the end cap 8 is smaller than the opening width of the connecting groove 123. The outer end of the opening and closing part 3 is columnar and passes through the inner hole of the end cap 8. The outer side of the middle part of the opening and closing part 3 also has a shoulder 32. When the opening and closing part 3 moves outward under the elastic force of the elastic member 5, the shoulder 32 can abut against the end cap 8, and the outer end of the opening and closing part 3 can abut against the linkage plate 23 of the ejector 2 on the side facing the ejector plate 21.

[0033] like Figure 2 As shown, the air passage 12 also includes a vent 124 connected to the air outlet 121. The vent 124 is connected to the bottom of the connecting groove. A vertical hole and several connecting holes 126 are provided through the reflector insert 15. The vertical hole is connected to the vent 124. The several connecting holes 126 are arranged around the vent 124. One end of each of the several connecting holes 126 is connected to the vent 124 through the vertical hole. The other end of each of the several connecting holes 126 is connected to the air outlet gap 125.

[0034] During installation, the inlet of the gas-assisted synchronous ejection mechanism is connected to the gas source, and the ejector 2 is matched with the drive component. The drive component can be a pneumatic cylinder or a hydraulic cylinder.

[0035] In the default state, the ejector 2 is in the initial position, that is, the lower position, and does not eject. The opening and closing part 3 is pressed into the communicating groove 123 by the linkage plate 23, that is, most of the opening and closing part 3 is located in the air passage 12, while the outer end of the opening and closing part 3 always extends out of the air passage 12 and abuts against the linkage plate 23. The inner end of the opening and closing part 3 is separated from the air inlet 122 and the air outlet 121 by the sealing ring 6 and the sealing ring 7, thus blocking the air passage 12.

[0036] When demolding is required after injection molding, the drive component drives the ejector 2 to eject outwards. The ejector plate 21 drives the ejector rod 22 and the linkage plate 23 to eject upwards simultaneously, removing the finished product from the cavity 11 of the mold 1. At the same time, if... Figure 4 As shown, the opening and closing part 3 moves upward synchronously with the linkage plate 23 under the elastic force of the elastic element 5, so that the sealing ring 7 leaves the bottom surface of the connecting groove 123, the air inlet 122 and the air outlet 121 are connected, the air passage 12 is opened, and the gas from the air source is transported along the air inlet 122, the air outlet 121, the vent 124, the vertical hole and the connecting hole 126 to the air outlet gap 125, and output into the cavity 11, which also acts on the finished product in the cavity 11 to assist in demolding.

[0037] Example 2

[0038] The technical solution of this embodiment is largely the same as that of Embodiment 1, except that: no vertical hole and connecting hole 126 are opened in the reflector insert 15. Instead, several recessed, elongated air distribution grooves are opened on the bottom surface of the connecting groove. The air distribution grooves are arranged around the outlet of the vent hole 124. One end of each air distribution groove is connected to the vent hole 124, and the other end of each air distribution groove is connected to the air outlet gap 125. That is, the gas is sent to the cavity 11 through the vent hole 124, the air distribution grooves and the air outlet gap 125.

[0039] Meanwhile, since the opening directions of the air distribution groove and the vent 124 are perpendicular, air pressure loss is likely to occur. Therefore, an air distribution block is fixed on the moving mold insert 14 at the outlet of the vent 124. The air distribution block is fixed to the moving mold insert 14 by several radially arranged spokes. One end of the air distribution block extends into the outlet of the vent 124, and the outer surface of this end of the air distribution block is a conical surface. The diameter of the conical surface gradually increases from the inlet to the outlet of the vent 124. The other end of the air distribution block has a protruding annular air guide. The end face of the air guide facing the conical surface is an arc surface, and the position of the arc surface away from the center of the air distribution block corresponds to the end position of the air distribution groove. The diameter of the vent 124 gradually decreases from the inlet to the outlet.

[0040] Furthermore, to prevent fatigue of the elastic element 5 due to long-term use, the spring hole 31 and the elastic element 5 can be omitted. Instead, a recessed locking slot is formed on the side of the linkage plate 23 of the ejector 2, corresponding to the position of the opening / closing part 3. The cross-section of the opening of the locking slot is square, and the cross-section of the inner end of the locking slot is circular, with the diameter of the circle being larger than the width of the opening of the locking slot. The outer end of the opening / closing part 3 has a locking part, the outer side of which protrudes from the outer surface of other positions of the outer end of the opening / closing part 3, and the cross-sectional shape and size of the locking part matches the cross-sectional shape and size of the locking slot opening. A rod-shaped handle is radially threaded to the outer end of the opening / closing part 3 adjacent to the locking part.

[0041] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A gas-assisted synchronous ejection mechanism for use in a mold (1) having a cavity (11), comprising an ejector (2) for demolding and a gas passage (12) for conveying gas, the outlet of the gas passage (12) being connected to the cavity (11), characterized in that, The air passage (12) is provided with an opening and closing part (3) that can block the air passage (12). The outer end of the opening and closing part (3) extends out of the air passage (12) and abuts against or connects with the ejector (2). When the ejector (2) moves, the opening and closing part (3) can move synchronously with the ejector (2) and open the air passage (12). The gas-assisted synchronous ejection mechanism also includes a control element (4). The air passage (12) includes an air inlet (122) and an air outlet (122) both opened on the control element (4). 1) and the connecting groove (123), the outlet of the air inlet (122) and the inlet of the air outlet (121) are both connected to the bottom of the connecting groove (123), the opening and closing part (3) is disposed in the connecting groove (123) and when the opening and closing part (3) moves toward the bottom of the connecting groove (123), it can block the air passage (12), the mold (1) includes a moving mold frame (13), a moving mold insert (14) fixed on the moving mold frame (13) and a retroreflector insert (15), the moving mold insert The block (14) has a recessed connecting groove on the side away from the moving mold frame (13). The retroreflector insert (15) is fixed in the connecting groove. The side of the retroreflector insert (15) and the moving mold insert (14) away from the moving mold frame (13) is used to form the cavity (11) between them and the stationary mold. The air passage (12) also includes a vent hole (124) connected to the vent hole (121) and an annular vent gap formed between the outer side of the retroreflector insert (15) and the side wall of the connecting groove. (125) The vent (124) is connected to the bottom of the connecting groove, and the air outlet gap (125) is connected to the vent (124). Several connecting holes (126) are provided through the reflector insert (15). Several connecting holes (126) are arranged around the vent (124). One end of several connecting holes (126) is connected to the vent (124), and the other end of several connecting holes (126) is connected to the air outlet gap (125).

2. A gas-assisted synchronous ejection mechanism according to claim 1, wherein An elastic element (5) is provided between the bottom of the opening / closing part (3) and the connecting groove (123), and the outer end of the opening / closing part (3) can abut against the ejector (2) under the elastic force of the elastic element (5).

3. A gas-assisted synchronous ejection mechanism according to claim 2, wherein A sealing ring 1 (6) is provided between the outer side of the opening and closing part (3) and the side wall of the connecting groove (123). The opening and closing part (3) has a recessed spring hole (31) in the middle of the bottom surface. The elastic element (5) is provided in the spring hole (31). A sealing ring 2 (7) is provided between the bottom of the opening and closing part (3) and the bottom surface of the connecting groove (123). The sealing ring 2 (7) is arranged around the spring hole (31). The outlet of the air inlet (122) and the inlet of the air outlet (121) are offset from the spring hole (31).

4. A gas-assisted synchronous ejection mechanism according to claim 2 or 3, wherein The control component (4) is fixed with an annular end cap (8) on one side of the opening of the connecting groove (123). The inner diameter of the end cap (8) is smaller than the opening width of the connecting groove (123). The outer end of the opening and closing part (3) is columnar and passes through the inner hole of the end cap (8). The outer side of the opening and closing part (3) also has a shoulder (32). When the opening and closing part (3) moves outward under the elastic force of the elastic member (5), the shoulder (32) can abut against the end cap (8).

5. A gas-assisted synchronous ejection mechanism according to claim 1, wherein The bottom surface of the connecting groove has several recessed, elongated air distribution grooves. These grooves are arranged around the outlet of the vent (124). One end of each groove is connected to the vent (124), and the other end is connected to the air outlet gap (125). An air distribution block is fixed on the moving mold insert (14) at the outlet of the vent (124). One end of the air distribution block extends into the outlet of the vent (124), and the outer surface of that end is a conical surface. The diameter of the conical surface gradually increases from the inlet to the outlet of the vent (124). The outer side of the other end of the air distribution block has a protruding, annular air guide. The end face of the air guide facing the conical surface is an arc surface, and the position of the arc surface away from the center of the air distribution block corresponds to the position of the air distribution groove. The diameter of the vent (124) gradually decreases from the inlet to the outlet.

6. A gas-assisted synchronous ejection mechanism according to claim 1, wherein The ejector (2) has a recessed lock opening on the side corresponding to the opening and closing part (3). The cross-section of the opening of the lock opening is square, and the cross-section of the inner end of the lock opening is circular with a diameter greater than the width of the opening of the lock opening. The opening and closing part (3) is cylindrical. The outer end of the opening and closing part (3) has a lock part. The outer side of the lock part protrudes from the outer side of the opening and closing part (3) at other positions. The cross-sectional shape and size of the lock part match the cross-sectional shape and size of the opening of the lock opening. A rod-shaped handle is radially threaded to the outer end of the opening and closing part (3) adjacent to the lock part.

Images