Air-assisted separation type compression molding mold and using method thereof

Abstract

The air-assisted separation type compression molding die comprises a lower die assembly, a cavity is formed in the top face of the lower die assembly, an air blowing assembly is embedded in the wall face of the cavity, the air blowing assembly comprises an axially-through air needle, the air needle is connected with an external air source, and the end portion of the air outlet end of the air needle is flush with the wall face of the cavity; an ejector pin assembly is further included, an ejector pin in the ejector pin assembly is coaxially assembled in the air pin, the ejector pin is driven by driving power to move in the axial direction, and the ejector pin is switched between the two positions where the air outlet end of the air pin is blocked or communicated; during compression molding, the ejector pin end blocked by the air needle is located on the same surface of the air needle and the cavity without affecting molding, after molding, the ejector pin acts to promote air channels of the air needle to be communicated, air is blown towards the cavity through the air needle, an air layer is formed between the wall face of the cavity and a product, and the product on the wall face of the cavity is rapidly disengaged in a lossless mode. The production efficiency and the safety are greatly improved, the integration of an automatic production line is facilitated, and the mold is particularly suitable for complete demolding of shell products with large surfaces.

Description

Technical Field

[0001] This invention relates to the field of molding die technology, and in particular to a gas-assisted separation molding die and its application method. Background Technology

[0002] Compression molding, an important molding process, involves placing powdered, granular, or fibrous plastic into a mold cavity at the molding temperature, then closing the mold and applying pressure to shape and solidify it. Compression molding uses higher molding pressure than other processes, classifying it as high-pressure molding. It can be used for thermosetting plastics, thermoplastics, and rubber materials.

[0003] After carbon fiber composite products are compression molded, they are usually cooled first due to their tight fit with the mold cavity. Demolding is then performed using tools such as pry bars, which can easily cause scratches, tears, or mold damage. This is especially problematic for shell-type products with large contact areas with the mold cavity, hindering complete demolding. More importantly, if forced demolding is performed under high temperatures, the extremely high mold surface temperature (exceeding 150°C) poses a serious risk of burns to operators.

[0004] The current method of manually demolding in compression molding severely restricts production efficiency and operational safety, limiting the integration of compression molding into automated production lines. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a reasonably structured air-assisted separation molding die and its usage method, thereby enabling the product to be quickly and without damage to the cavity wall, greatly improving and ensuring production efficiency and safety, facilitating integration into automated production lines, and is especially suitable for the complete demolding of products with large surface shells.

[0006] The technical solution adopted in this invention is as follows: A pneumatically assisted separation molding die includes a lower die assembly with a cavity on its top surface and an air blowing assembly embedded in the cavity wall. The air blowing assembly includes an axially penetrating air needle connected to an external air source, with the air outlet end of the air needle flush with the cavity wall. The die also includes an ejector assembly with ejector pins coaxially mounted inside the air needles. The ejector pins are driven to move axially by a driving force, and the ejector pins switch between two positions: blocking or penetrating the air outlet end of the air needle.

[0007] As a further improvement to the above technical solution: The lower mold assembly has multiple parallel cavities on its top surface, each cavity is equipped with an air blowing assembly, and each air blowing assembly is equipped with a corresponding ejector pin assembly; the ejector pins in the ejector pin assemblies at corresponding positions of the multiple cavities are driven synchronously by the same driving force.

[0008] The driving power is a linear driving power, and the output end of the driving power is connected to a movable seat. The movable seat is slidably mounted on the lower mold assembly in the driving direction of the driving power. The movable seat is provided with an inclined protrusion, and the inclination direction of the inclined protrusion forms an acute angle with the moving direction of the movable seat. The inclined protrusion is slidably mounted on a lifting seat along the inclination direction, and the ejector pin is mounted on the lifting seat. The movable seat, the lifting seat, and the ejector pin constitute the ejector pin assembly.

[0009] Multiple ejector pin assemblies are arranged along the driving direction of the driving power, and a connecting piece is installed between the movable seats in adjacent ejector pin assemblies.

[0010] The lower mold assembly is equipped with a track, the length direction of which is consistent with the driving direction of the driving power; the movable seat is provided with a sliding groove that matches the sliding of the track, and the movable seat moves relative to the track along the length direction.

[0011] The inner hole of the air needle outlet and the outer wall of the ejector pin end form a mutually compatible conical structure. An annular groove is provided on the outer wall of the ejector pin adjacent to the conical structure, and the annular groove and the inner wall of the air needle are separated. A circumferential groove is opened on the outer wall of the air needle, and a through hole is opened through the air needle wall, which connects the axial hole of the air needle with the circumferential groove. The distance between the circumferential groove and the conical structure is greater than the distance between the annular groove and the conical structure.

[0012] The air blowing assembly includes a support fixedly installed on the lower mold assembly. The lower mold assembly has a cavity for the support to fit into, and a fitting hole is opened in the cavity and extends toward the cavity. The support presses and fixes the air needle in the fitting hole. An air distribution hole communicating with an external air source is opened on the side wall of the fitting hole. The circumferential groove on the air needle is arranged opposite to the air distribution hole.

[0013] An air pipe connector is installed on the side wall of the lower mold assembly, and the air pipe connector is connected to an external air source via a pipeline; an air hole is opened in the lower mold assembly to connect the air pipe connector and the air needle.

[0014] The air inlet includes an air inlet connected to the air pipe connector. The air inlet is connected to multiple air distribution holes at intervals along the axial direction, and each air distribution hole is connected to a corresponding air needle.

[0015] A method of using the aforementioned gas-assisted separation compression molding die includes the following steps: Before compression molding, the ejector pin is positioned to block the air needle. At this time, the end of the ejector pin is flush with the end of the air needle and the cavity wall. After compression molding, the upper mold assembly detaches from the lower mold assembly. The driving force drives the ejector pin to move relative to the air needle to the through position. The external air source works and blows air into the cavity through the air needle outlet, forming an air layer between the cavity and the molded part. This drives the molded part to detach from the cavity and achieve separation.

[0016] Compared with the prior art, the present invention has the following beneficial effects: During compression molding, the end of the ejector pin that blocks the air needle is located on the same surface as the air needle and the cavity without affecting the molding process. After molding, the ejector pin movement causes the air passage of the air needle to be open, and air is blown towards the cavity through the air needle, forming an air layer between the cavity wall and the product. This enables the product to be removed from the cavity wall without damage and quickly, greatly improving and ensuring production efficiency and safety, and helping to integrate into automated production lines. It is especially suitable for the complete demolding of large surface shell products. The present invention also includes the following advantages: Driven by a power source, the ejector pins in the ejector assembly move, working in conjunction with the air-blowing assembly to effectively replace manual labor and achieve automated demolding. This eliminates the need for prolonged cooling after molding, allowing demolding to be performed immediately after the product has been molded and set. This facilitates hot-in and hot-out molding, effectively shortening the overall molding cycle. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the present invention.

[0018] Figure 2 This is a structural diagram of the invention from another perspective.

[0019] Figure 3 This is a schematic diagram showing the arrangement of the ejector pin assembly and the air blowing assembly in the cavity of the lower mold assembly of the present invention.

[0020] Figure 4 for Figure 3 A magnified view of a portion of point A in the middle.

[0021] Figure 5 This is an exploded view of the ejector pin assembly of the present invention.

[0022] Figure 6 This is a cross-sectional view of the ejector pin assembly and air blowing assembly of the present invention.

[0023] Figure 7 for Figure 6 A magnified view of a section at point B.

[0024] Figure 8 This is a schematic diagram showing the arrangement of air holes in the lower mold assembly of the present invention.

[0025] The components include: 1. Lower mold assembly; 2. Air pipe connector; 3. Upper mold assembly; 4. Locking device; 5. Drive power; 6. Track; 7. Ejector pin assembly; 8. Guide assembly; 9. Air blowing assembly; 11. Cavity; 12. Locating pin; 13. Mounting hole; 14. Recess; 21. Air inlet; 22. Air distribution port; 51. Connecting parts; 70. Connecting component; 71. Movable seat; 72. Lifting seat; 73. Ejector pin; 711. Slide groove; 712. Inclined convex ridge; 721. Concave groove; 730. Conical structure; 731. Annular groove; 91. Support; 92. Sealing ring; 93. Air needle; 911. Concave arc structure; 930. Protrusion; 931. Circumferential groove; 932. Through hole. Detailed Implementation

[0026] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0027] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment of a gas-assisted separation molding die includes a lower mold assembly 1, a cavity 11 is opened on the top surface of the lower mold assembly 1, and an air blowing assembly 9 is embedded on the wall of the cavity 11. The air blowing assembly 9 includes an axially penetrating air needle 93, which is connected to an external air source. The air outlet end of the air needle 93 is flush with the wall of the cavity 11. It also includes an ejector assembly 7, in which an ejector pin 73 is coaxially mounted inside the air needle 93. The ejector pin 73 is driven by a driving force 5 to move axially, and the ejector pin 73 switches between two positions: blocking or penetrating the air outlet end of the air needle 93.

[0028] In this embodiment, during compression molding, the end of the ejector pin 73 that blocks the air needle 93 is located on the same surface as the air needle 93 and the cavity 11 without affecting the molding. After molding, the ejector pin 73 moves to make the air passage of the air needle 93 open, and air is blown towards the cavity 11 through the air needle 93, forming an air layer between the wall of the cavity 11 and the product, so as to achieve the product's rapid and damage-free removal from the wall of the cavity 11.

[0029] In this embodiment, the driving force 5 drives the ejector pin 73 in the ejector pin assembly 7 to move, which, together with the air blowing assembly 9, effectively replaces manual labor and realizes automated demolding. This eliminates the need for long-term cooling after molding, and demolding can be performed after the product has been molded and shaped. This helps to achieve hot-in and hot-out molding and effectively shortens the overall molding cycle.

[0030] like Figure 3 and Figure 4 In the embodiment shown, the top surface of the lower mold assembly 1 has a plurality of parallel cavities 11, each cavity 11 is fitted with an air blowing assembly 9, and each air blowing assembly 9 is provided with a corresponding ejector pin assembly 7, so that the ejector pin assembly 7 matches the air blowing assembly 9, corresponding to each cavity 11, so as to realize the smooth and complete demolding of the product in each cavity 11.

[0031] In actual operation, ejector pin assembly 7 and air blowing assembly 9 can be arranged on the wall of cavity 11 according to the actual demolding requirements, such as in deep cavities, negative corners and other areas that are prone to sticking.

[0032] In practice, depending on the actual demolding requirements, two or more sets of matching ejector pin assemblies 7 and air blowing assemblies 9 can be arranged in the same cavity 11; for example... Figure 2 and Figure 3 As shown, ejector pin assembly 7 and air blowing assembly 9 are respectively arranged at both ends of the same cavity 11 along its length direction to facilitate and ensure that the molded part is demolded uniformly, quickly and smoothly relative to the cavity 11.

[0033] In actual operation, auxiliary parts such as positioning pins 12 can be set in the cavity 11 according to the requirements of the molded part to ensure that the corresponding positioning holes on the molded part are formed simultaneously in one step.

[0034] The ejector pins 73 in the ejector pin assembly 7 at corresponding positions of multiple cavities 11 are driven synchronously by the same driving power 5, thereby effectively ensuring that the molded parts in each cavity 11 are demolded at the same time, realizing the rational and effective use of the driving power 5.

[0035] exist Figure 2 and Figure 3 In the embodiment shown, the lower mold assembly 1 is provided with three cavities 11, and the ejector pins 73 of the ejector pin assembly 7 at the same end of the three cavities 11 are synchronously driven by the same driving power 5.

[0036] Drive force 5 is a linear drive force, such as Figure 5 As shown, the output end of the driving power 5 is connected to a movable seat 71, which is slidably mounted on the lower mold assembly 1 in the driving direction of the driving power 5; the movable seat 71 is provided with an inclined protrusion 712, and the inclined direction of the inclined protrusion 712 forms an acute angle with the moving direction of the movable seat 71; the inclined protrusion 712 is slidably mounted on a lifting seat 72 along the inclined direction, and the ejector pin 73 is mounted on the lifting seat 72. The movable seat 71, the lifting seat 72, and the ejector pin 73 constitute the ejector pin assembly 7.

[0037] In this embodiment, the driving power 5 can be a conventional linear driving power such as a cylinder, oil cylinder, or electric cylinder. The action of the driving power 5 can drive the ejector pin 73 in the ejector pin assembly 7 to move, thereby satisfying the blocking and opening switching of the air needle 93 in the air blowing assembly 9 at the cavity 11 of the compression molding die.

[0038] In actual operation, the driving force 5 drives the movable seat 71 to move in the driving direction, so that the lifting seat 72 is slidably fitted at different positions of the inclined protrusion 712, realizing the movement and adjustment of the lifting seat 72 in the height direction. The ejector pin 73 moves synchronously in the height direction with the lifting seat 72, thereby switching between the two positions of blocking and opening.

[0039] for example Figure 5 As shown, the lifting seat 72 is located at the high position of the inclined protrusion 712, and the ejector pin 73 is located at the high position and is in a position to block the air outlet of the air needle 93; when the driving force 5 pulls the moving seat 71 to move, the lower position of the inclined protrusion 712 will be located at the lifting seat 72, the lifting seat 72 will move downward, and the ejector pin 73 will move axially downward relative to the air needle 93 until the air needle 93 is penetrated.

[0040] In this embodiment, inclined protrusions 712 can be symmetrically spaced on the movable seat 71, and concave grooves 721 that match the inclined protrusions 712 on both sides can be opened on the lifting seat 72. Thus, when the movable seat 71 moves back and forth in the driving direction, the lifting seat 72 can be driven to move up or down synchronously through the matching of the inclined protrusions 712 and the concave grooves 721.

[0041] Multiple ejector pin assemblies 7 are arranged along the driving direction of the driving power 5, and a connecting member 70 is installed between the movable seats 71 in adjacent ejector pin assemblies 7.

[0042] In this embodiment, multiple ejector pin assemblies 7 arranged in the same driving direction of the driving power 5 can be matched to different cavities 11. Of course, they can also be matched to different positions in the same cavity 11.

[0043] In this embodiment, the connector 70 can be a connector block that is fixedly embedded between adjacent movable seats 71 by bolts or other fasteners. This enables the structural connection between adjacent movable seats 71 and allows them to move synchronously in the driving direction of the driving power 5 without affecting the smooth sliding fit between the movable seats 71 and the track 6.

[0044] In this embodiment, a connector 51 can be installed between the output end of the drive power 5 and the adjacent movable seat 71. The two opposite ends of the connector 51 are respectively fitted to the output end of the drive power 5 and the movable seat 71 and are relatively fixed in the driving direction. In one embodiment, the two ends of the connector 51 can adopt a T-shaped, dovetail or other concave-convex fitting structure to be installed with the output end of the drive power 5 and the movable seat 71 respectively.

[0045] A track 6 is installed on the lower mold assembly 1, and the length direction of the track 6 is consistent with the driving direction of the driving power 5. A sliding groove 711 is provided on the movable seat 71 to slide with the track 6. The movable seat 71 moves relative to the track 6 along the length direction, so that the movable seat 71 can move reliably and smoothly relative to the track 6 and the lower mold assembly 1 under the drive of the driving power 5.

[0046] like Figure 6 and Figure 7As shown, the inner hole of the air outlet end of the air needle 93 and the outer wall of the end of the ejector pin 73 form a mutually compatible conical structure 730. The outer wall of the ejector pin 73 adjacent to the conical structure 730 is provided with an annular groove 731, which is spaced from the inner wall of the air needle 93. The outer wall of the air needle 93 is provided with an annular groove 931, and a through hole 932 is provided through the wall of the air needle 93, which connects the axial hole of the air needle 93 with the annular groove 931. The distance between the annular groove 931 and the conical structure 730 is greater than the distance between the annular groove 731 and the conical structure 730.

[0047] In actual use, when the ejector pin 73 moves upward until its end is flush with the end of the air needle 93, the conical structure 730 fits properly, and the annular groove 731 is offset axially above the circumferential groove 931. The air needle 93 through hole 932 and the air outlet end are not unobstructed, so the ejector pin 73 blocks the air needle 93. When the ejector pin 73 moves downward relative to the air needle 93, the conical structures 730 separate from each other to form a gap. The annular groove 731 of the ejector pin 73 moves down until it is directly opposite the circumferential groove 931 of the air needle 93. Thus, the gas that enters the axial hole of the air needle 93 through the through hole 932 is surrounded by the annular groove 731 around the ejector pin 73 and blown upward through the gap between the conical structures 730, so that the air needle 93 is penetrated and blown towards the cavity 11.

[0048] The air blowing assembly 9 includes a support 91 fixedly installed on the lower mold assembly 1. The lower mold assembly 1 has a cavity 14 for mounting the support 91. A mounting hole 13 is provided in the cavity 14 and passes through the cavity 11. The support 91 presses and fixes the air needle 93 in the mounting hole 13. A distribution hole 22 communicating with an external air source is provided on the side wall of the mounting hole 13. The circumferential groove 931 on the air needle 93 is arranged opposite to the distribution hole 22, so that the distribution hole 22 is connected to the axial hole of the air needle 93 through the circumferential groove 931 and the through hole 932.

[0049] In this embodiment, the air needle 93 extends circumferentially toward the end of the support 91 to form a protrusion 930, so that the air needle 93 can be reliably press-fitted and fixed to the mounting hole 13 of the lower mold assembly 1 by the support 91 through the protrusion 930, effectively ensuring the reliability and stability of the air needle 93 installed on the lower mold assembly 1.

[0050] In this embodiment, a sealing ring 92 can be arranged on the side of the protrusion 930 facing the lower mold assembly 1 to ensure sealing performance and ensure that the gas in the air distribution hole 22 can be stably discharged through the air needle 93.

[0051] In this embodiment, the ejector pin 73 is axially mounted in the air needle 93, and the lifting seat 72 located at the bottom end of the ejector pin 73 is slidably mounted on the movable seat 71. At the same time, a concave arc-shaped structure 911 can be provided on the support 91 at the bottom end of the air needle 93. The concave arc-shaped structure 911 is adapted to the lifting seat 72. During the process of the ejector pin 73 moving upward or downward relative to the air needle 93 along with the lifting seat 72, the concave arc-shaped structure 911 provides guidance and structural avoidance for the upward and downward movement of the lifting seat 72, effectively ensuring its smooth upward and downward movement.

[0052] An air pipe connector 2 is installed on the side wall of the lower mold assembly 1. The air pipe connector 2 is connected to an external air source through a pipeline. An air hole is opened in the lower mold assembly 1 to connect the air pipe connector 2 and the air needle 93.

[0053] In this embodiment, the external air source is high-pressure gas. When connected, the gas instantly flows into the air needle 93 through the pipeline and air hole, and is blown out through the air outlet of the air needle 93 to act on the interface between the cavity 11 and the product. The gas blown out from the air needle 93 will form a relatively uniform air cushion, and smoothly blow the product away from the cavity 11, realizing non-contact demolding of the product.

[0054] In this embodiment, the high-pressure gas can be clean compressed air or nitrogen, which can form a gas layer when blown into the cavity 11 and drive the molded part to detach from the cavity 11.

[0055] In practice, a solenoid valve can be installed on the pipeline, and the operation of the solenoid valve can control the flow of gas in the pipeline.

[0056] like Figure 8 As shown, the air inlet includes an air inlet 21 connected to the air pipe connector 2. The air inlet 21 is connected to multiple air distribution holes 22 at intervals along the axial direction. Each air distribution hole 22 is connected to a corresponding air needle 93, thereby realizing synchronous and simultaneous air supply and blowing at multiple air needles 93.

[0057] The compression molding die of this embodiment adopts a split upper and lower half-joining structure, and is provided with an upper die component 3 that matches the lower die component 1. The upper die component 3 and the lower die component 1 are closed to form the entire compression molding die.

[0058] In actual operation, after the upper mold assembly 3 and the lower mold assembly 1 are closed, multiple sets of locking components 4 can be installed along the circumferential wall of their contact surface to achieve mold locking and fastening between the upper mold assembly 3 and the lower mold assembly 1. The locking components 4 can be fasteners such as bolts used to lock the connecting plate to the upper mold assembly 3 and the lower mold assembly 1. To facilitate hoisting and other operations of the compression molding die, structures such as lifting rings can be set up for easy hoisting.

[0059] To effectively ensure the accuracy and consistency of mold closing between the upper mold assembly 3 and the lower mold assembly 1, a guide assembly 8, such as a guide post or guide sleeve structure, can be set between the upper mold assembly 3 and the lower mold assembly 1 for mold closing guidance.

[0060] To facilitate timely acquisition of molding temperature, temperature measuring points can be set on the sides of the upper mold assembly 3 and / or the lower mold assembly 1; to ensure the heat insulation performance of the molding die itself, heat insulation board can be laid on its surface.

[0061] The method of using the air-assisted separation compression molding die in this embodiment includes the following steps: Before compression molding, the ejector pin 73 is positioned to block the air needle 93. At this time, the end of the ejector pin 73 is flush with the end of the air needle 93 and the wall of the cavity 11, together forming the surface of the molded part.

[0062] After the upper mold assembly 3 and the lower mold assembly 1 are closed and locked in place by the locking component 4, the product can be transferred to the press by a robotic arm. As the temperature gradually rises, for example to 150°C, the product inside the mold is thermally pressed and solidified, thus achieving the product molding.

[0063] After compression molding, the upper mold assembly 3 separates from the lower mold assembly 1. The driving force 5 drives the ejector pin 73 to move relative to the air needle 93 to the through position. The external air source works and blows air into the cavity 11 through the air outlet of the air needle 93, forming an air layer between the cavity 11 and the contact surface of the molded part, driving the molded part to separate from the cavity 11.

[0064] After the molded part is separated from the cavity 11, the product can be taken away by a robot, and the molding die can immediately carry out the next cycle of loading and molding operations, effectively reducing the heating and cooling time and greatly helping to improve production efficiency.

[0065] This invention enables the rapid and non-destructive removal of products from the cavity wall, greatly improving and ensuring production efficiency and safety, and facilitating integration into automated production lines. It is especially suitable for the complete demolding of products with large surface shells.

[0066] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0067] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. A gas assisted separation type compression moulding mould comprising a lower mould assembly (1), characterised in that: The lower mold assembly (1) top surface is provided with a cavity (11), the cavity (11) wall surface is embedded with a blowing assembly (9), the blowing assembly (9) includes an axial through air needle (93), the air needle (93) is connected with an external air source, the air needle (93) gas outlet end is flush with the cavity (11) wall surface; further comprising a ejector pin assembly (7), the ejector pin (73) in the ejector pin assembly (7) is coaxially arranged in the air needle (93), the ejector pin (73) is driven by the driving power (5) to move axially, the ejector pin (73) switches between the two positions of blocking the air needle (93) gas outlet end or penetrating.

2. An air-assisted, breakaway, compression molding mold as defined in claim 1, wherein: The lower mold assembly (1) top surface is provided with a plurality of parallelly arranged cavities (11), each cavity (11) is embedded with a blowing assembly (9), a single blowing assembly (9) is provided with a corresponding ejector pin assembly (7); the ejector pin (73) in the ejector pin assembly (7) at the corresponding position of the plurality of cavities (11) is driven by the same driving power (5) to act synchronously.

3. A gas-assisted, separate-mold press molding mold according to claim 1 or 2, characterized in that: The driving power (5) is a linear driving power, the driving power (5) output end is connected with a moving seat (71), the moving seat (71) is slidingly arranged on the lower mold assembly (1) in the driving direction of the driving power (5); the moving seat (71) is provided with an inclined rib (712), the inclined direction of the inclined rib (712) and the moving direction of the moving seat (71) form an acute angle; the inclined rib (712) is slidingly arranged with a lifting seat (72) along the inclined direction, the ejector pin (73) is installed on the lifting seat (72), and the moving seat (71), the lifting seat (72) and the ejector pin (73) form the ejector pin assembly (7).

4. An air-assisted, breakaway moulding mould as claimed in claim 3, wherein: A plurality of ejector pin assemblies (7) are arranged along the driving direction of the driving power (5), and the moving seats (71) in the adjacent ejector pin assemblies (7) are jointly installed with a connecting piece (70).

5. An air-assisted, breakaway, compression molding mold as defined in claim 3, wherein: The lower mold assembly (1) is installed with a track (6), the length direction of the track (6) is consistent with the driving direction of the driving power (5); the moving seat (71) is provided with a sliding groove (711) matched with the sliding of the track (6), and the moving seat (71) moves relatively along the length direction of the track (6).

6. An air-assisted, breakaway, compression molding mold as defined in claim 1, wherein: The inner hole of the air needle (93) gas outlet end and the outer wall surface of the ejector pin (73) end form a tapered structure (730) matched with each other, an annular groove (731) is arranged on the outer wall surface of the ejector pin (73) close to the tapered structure (730), and the annular groove (731) and the inner wall surface of the air needle (93) form a spacing; the outer wall surface of the air needle (93) is provided with a ring groove (931), a through hole (932) is arranged through the wall surface of the air needle (93), and the through hole (932) communicates the axial hole of the air needle (93) with the ring groove (931); the distance between the ring groove (931) and the tapered structure (730) is greater than the distance between the annular groove (731) and the tapered structure (730).

7. An air-assisted, breakaway moulding mould as claimed in claim 6, wherein: The air blowing assembly (9) comprises a support (91) fixedly installed on the lower die assembly (1), the lower die assembly (1) is provided with a recess (14) for accommodating the support (91), and a fitting hole (13) is communicated with the recess (14) and penetrates the cavity (11); the support (91) is press-fitted with an air needle (93) in the fitting hole (13), and a gas distribution hole (22) is provided on the side wall of the fitting hole (13) and communicated with an external gas source, and a circumferential groove (931) of the air needle (93) is arranged opposite to the gas distribution hole (22).

8. An air-assisted, breakaway, compression molding mold as defined in claim 1, wherein: The lower die assembly (1) is provided with an air pipe joint (2) on the side wall surface, and the air pipe joint (2) is communicated with an external gas source through a pipeline; the lower die assembly (1) is provided with a gas hole communicated between the air pipe joint (2) and the air needle (93).

9. An air-assisted, breakaway moulding mould as claimed in claim 8, wherein: The gas hole comprises an air inlet hole (21) communicated with the air pipe joint (2), a plurality of gas distribution holes (22) are axially spaced and communicated with the air inlet hole (21), and each gas distribution hole (22) is connected to a corresponding air needle (93).

10. A method of using the air-assisted, knockout, compression molding mold of claim 1, characterized by: The method comprises the following steps: Before the mold pressing forming, the ejector pin (73) is located at a position for blocking the air needle (93), at this time, the end of the ejector pin (73) is flush with the end of the air needle (93) and the wall surface of the cavity (11); After the mold pressing forming, the upper die assembly (3) is separated from the lower die assembly (1), the driving power (5) drives the ejector pin (73) to move to a penetrating position relative to the air needle (93), the external gas source is operated, air is blown from the air outlet end of the air needle (93) towards the cavity (11), an air layer is formed between the cavity (11) and the interface of the formed part, and the formed part is separated from the cavity (11) to realize separation.

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