CN214926746U - Gas cap mechanism of mould - Google Patents

Abstract

The utility model relates to a gas cap mechanism of mould, it includes shell, ejector pin, locating part, cushion and reset spring, and ejector pin, locating part, spring assembly are in the shell, and the cushion assembles the bottom surface to the shell. The utility model has the advantages of simple whole structure and strong reliability, set up the first seal end face of horizontally at the head of ejector pin, improve the ejector pin to the gas tightness of first slotted hole, avoid gas leakage phenomenon's emergence effectively, from first annular cavity, first slotted hole, the second slotted hole, the third slotted hole, the fourth slotted hole, second annular cavity, ventilation gap and inlet port, one-step, the gas flow is unobstructed in the same direction as, be difficult for blockking up, be applicable to the high-pressure high-speed injection mold, can support the pressure load of moulding plastics, can use on special-shaped face processing, and the installation on the mould is simple, it is efficient to take effect.

Description

Gas cap mechanism of mould

Technical Field

The utility model relates to the technical field of mold, especially, relate to a gas cap mechanism of mould.

Background

The air cap is named as a wind tip, an air valve and a pneumatic thimble, and the air cap is easier to eject relative to the thimble in a deep and closed vacuum state; when the product surface area is large and the product is not easy to fall off, the strength of the plastic part ejected by the gas cap is uniform, and the effect is better. The pneumatic jacking device has the advantages of high precision, simple installation, no space occupation and large function, and is the best product for improving the existing jacking device. The principle is that the product drops instantly by utilizing the air valve control and the air diffusion principle, thereby achieving the automatic effect. The gas cap is made of stainless steel, so that the gas cap is not rusted. The application of the gas cap eliminates the trouble of the die in the design and manufacturing process of the thimble, can solve the fault on ejection at the same time, and is a new breakthrough of the die manufacturing industry. The gas cap generally comprises a shell, a top rod, a spring and an elastic cylindrical pin.

For example, chinese utility model patent publication No. CN202388758U discloses a gas cap structure. The gas cap structure is used for ejecting a molded product in a mold, and comprises a vent screw, a limiting block, a spring and an ejector pin, wherein the spring is sleeved on the ejector pin and embedded in a mold core of the mold, the vent screw penetrates through the limiting block and extends into the ejector pin, and the limiting block is embedded in the mold core and abuts against the spring. The chinese utility model patent with publication number CN209224502U discloses a gas cap resistance plane downward moving mechanism for an injection mold, which comprises a gas cap inner core and a gas cap outer core, wherein a spring is arranged in the gas cap outer core, the gas cap inner core is inserted on the spring, the matching surface of the gas cap inner core and the gas cap outer core is one, and the bottom of the gas cap outer core is provided with a cushion medium; during blowing, the gas acts on the gas cap inner core to move upwards, the matching surfaces of the gas cap inner core and the gas cap outer core are separated, and the plane is prevented from being separated from the pad interface; when the cushion is reset, the spring acts on the gas cap inner core to move downwards, the matching surfaces of the gas cap inner core and the gas cap outer core are mutually attached, and the resisting plane is mutually attached to the cushion interface. Chinese utility model patent with publication number CN210265872U discloses a resistance to compression gas cap valve, including valve body, case, be equipped with the cavity that link up from top to bottom in the valve body, the case is installed in the cavity, still includes the supporting shoe, and the supporting shoe is installed in the cavity, and the lower extreme and the supporting shoe fixed mounting of case, the bottom surface of supporting shoe flush with the bottom surface of valve body, are equipped with the air vent on the supporting shoe, air vent and cavity intercommunication.

The three prior arts all have the following disadvantages: when the ejector rod and the limiting piece at the bottom of the ejector rod are integrated, the top of the ejector rod cannot form a good air-tight structure in order to be smoothly assembled in the shell, so that air leakage is easy to occur; when the ejector rod and the limiting piece are of a split structure, the limiting piece adopts a cylindrical pin mode, and the assembling structure is low in reliability and difficult to bear large pressure; the thrust that gas produced to the locating part when passing through the locating part is less strong, leads to pneumatic effect less strong, and the gas cap ability is relatively poor.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to above-mentioned prior art not enough, provide a gas cap mechanism of mould.

The embodiment of the utility model provides a gas cap mechanism of a mould, which comprises a shell, a mandril, a limiting part, a cushion block and a return spring, wherein the mandril, the limiting part and the spring are assembled in the shell, and the cushion block is assembled to the bottom surface of the shell; the shell is sequentially provided with a first slotted hole, a second slotted hole, a third slotted hole and a fourth slotted hole which are coaxially communicated from the top to the bottom, the inner diameter of the first slotted hole is larger than that of the second slotted hole, the end walls which are communicated together are arranged between the first slotted hole and the second slotted hole, the inner diameter of the third slotted hole is larger than that of the second slotted hole, and the inner diameter of the fourth slotted hole is larger than that of the third slotted hole; the ejector rod inserted from the first slot hole is in threaded assembly connection with the limiting piece inserted from the fourth slot hole, the outer diameter of the limiting piece is larger than that of the second slot hole and smaller than that of the third slot hole, and two ends of the spring act between the end wall and the limiting piece; the ejector rod comprises a head part with a larger outer diameter and a rod part with a smaller outer diameter, the head part is of an inverted frustum structure, the bottom surface of the head part is provided with a first horizontal plane, and the side wall of the head part is provided with a first inclined plane; the outer wall of the limiting part and the third groove hole form a second annular cavity, a plurality of support legs are arranged at the bottom of the limiting part, ventilation gaps are formed among the support legs, and the second annular cavity is communicated with the air inlet holes of the cushion block through the ventilation gaps.

In some embodiments, the inner wall of the fourth slot is provided with limit sliding grooves distributed along the axial direction, and the outer wall of the limiting member is embedded in the limit sliding grooves in an axially slidable manner.

In some embodiments, the outer wall of the limiting member has a plurality of triangular protrusions distributed along the axial direction, the limiting sliding groove is a triangular groove, and the angle of the triangular protrusion is greater than that of the triangular groove.

In some embodiments, the horizontal cross-section of the limiter is a triangular structure.

In some of these embodiments, the outside diameter of the stem is 2/3 of the aperture of the end wall's through hole.

In some embodiments, the retaining member includes a lower portion having a larger outer diameter and an upper portion having a smaller outer diameter, the outer diameter of the lower portion is larger than the inner diameter of the second slot and smaller than the inner diameter of the third slot, the outer diameter of the upper portion is smaller than the inner diameter of the second slot, and the middle portion of the upper portion is provided with an internal threaded hole in threaded connection with the rod portion.

In some of these embodiments, the lower edge of the via of the end wall is chamfered.

In some embodiments, a third inclined surface is arranged between the first horizontal surface and the first inclined surface in the head part of the ejector rod, and the inclination of the third inclined surface relative to the horizontal surface is smaller than that of the first inclined surface.

Compared with the prior art, the gas cap mechanism of the die provided by the embodiment of the utility model comprises a shell, a top rod, a limiting piece, a cushion block and a reset spring, wherein the top rod, the limiting piece and the spring are assembled in the shell, and the cushion block is assembled to the bottom surface of the shell; the shell is sequentially provided with a first slotted hole, a second slotted hole, a third slotted hole and a fourth slotted hole which are coaxially communicated from the top to the bottom, the inner diameter of the first slotted hole is larger than that of the second slotted hole, the end walls which are communicated together are arranged between the first slotted hole and the second slotted hole, the inner diameter of the third slotted hole is larger than that of the second slotted hole, and the inner diameter of the fourth slotted hole is larger than that of the third slotted hole; the ejector rod inserted from the first slot hole is in threaded assembly connection with the limiting piece inserted from the fourth slot hole, the outer diameter of the limiting piece is larger than that of the second slot hole and smaller than that of the third slot hole, and two ends of the spring act between the end wall and the limiting piece; the ejector rod comprises a head part with a larger outer diameter and a rod part with a smaller outer diameter, the head part is of an inverted frustum structure, the bottom surface of the head part is provided with a first horizontal plane, and the side wall of the head part is provided with a first inclined plane; the outer wall of the limiting part and the third groove hole form a second annular cavity, a plurality of support legs are arranged at the bottom of the limiting part, ventilation gaps are formed among the support legs, and the second annular cavity is communicated with the air inlet holes of the cushion block through the ventilation gaps. Overall structure is simple and the good reliability, set up the first sealing end face of horizontally at the head of ejector pin, improve the ejector pin to the gas tightness of first slotted hole, avoid the emergence of gas leakage phenomenon effectively, from first annular cavity, first slotted hole, the second slotted hole, the third slotted hole, the fourth slotted hole, second annular cavity, ventilation gap and inlet port, one-time, the gas flow is unobstructed in the same direction as, be difficult for blockking up, be applicable to high-pressure high-speed injection mold, can support the pressure load of moulding plastics, can use on special-shaped face processing, and the installation on the mould is simple, it is efficient to take effect.

The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below to provide a more concise and understandable description of other features, objects, and advantages of the invention.

Drawings

The accompanying drawings, which are described herein, serve to provide a further understanding of the invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are provided for explaining the invention without unduly limiting it. In the drawings:

fig. 1 is an exploded view of a pneumatic ram mechanism according to an embodiment of the present invention.

Fig. 2 is a perspective view of the pneumatic jacking mechanism according to the embodiment of the present invention.

Fig. 3 is a structural diagram of the gas cap mechanism in the mold insert in the mold closing state according to the embodiment of the present invention.

Fig. 4 is a structural diagram of the mold core of the mold-opening-state gas cap mechanism according to the embodiment of the present invention.

In the figure, 1, a housing; 2. a top rod; 3. a limiting member; 4. cushion blocks; 5. a return spring; 6. a mold core; 10. a limiting chute; 11. a first slot; 12. a second slot; 13. a third slot; 14. a fourth slot; 15. an end wall; 16. a second inclined surface; 17. a right-angled surface; 18. a via hole; 19. chamfering; 21. a head portion; 22. a rod portion; 23. a first horizontal plane; 24. a first inclined surface; 25. a third inclined surface; 31. a lower portion; 32. an upper portion; 33. an internally threaded bore; 34. a triangular bump; 35. a support leg; 36. a vent gap; 41. an air inlet; 61. an intake passage.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be described and illustrated with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Based on the embodiments provided by the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention. Moreover, it will be appreciated that in the development of any such actual embodiment, as in any specific implementation, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one of ordinary skill in the art that the described embodiments of the present invention can be combined with other embodiments without conflict.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as is commonly understood by one of ordinary skill in the art to which this invention belongs. The use of the terms "a" and "an" and "the" and similar referents in the context of describing the invention are not to be construed as limiting the number, but may be construed to cover both the singular and the plural. The present invention relates to the terms "comprises," "comprising," "includes," "including," "has," "having" and any variations thereof, which are intended to cover non-exclusive inclusions; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to the listed steps or elements, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. The terms "connected," "coupled," and the like in the description may not be limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The utility model relates to a "a plurality of" means more than or equal to two. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. The terms "first," "second," "third," and the like in the description of the invention are used merely to distinguish between similar objects and not necessarily to represent a particular ordering for the objects.

As shown in fig. 1-4, the embodiment of the present invention provides a gas cap mechanism of a mold, which includes a housing 1, a top rod 2, a limiting member 3, a cushion block 4 and a return spring 5, wherein the top rod 2, the limiting member 3 and the spring are assembled in the housing 1, and the cushion block 4 is assembled to the bottom surface of the housing 1. The gas cap structure only comprises a shell 1, an ejector rod 2, a limiting part 3, a cushion block 4 and a return spring 5, is simple and easy to use in overall structure, and is integrally assembled in the mounting groove of a die core 6 and communicated with an air inlet channel 61.

In the embodiment, the whole structure of the casing 1 is in a hollow cylinder shape, the casing 1 is provided with a first slot 11, a second slot 12, a third slot 13 and a fourth slot 14 which are coaxially communicated from the top to the bottom in sequence, the inner diameter of the first slot 11 is larger than that of the second slot 12, an end wall 15 which is communicated with the first slot 11 and the second slot 12 together is arranged between the first slot 11 and the second slot 12, the inner diameter of the third slot 13 is larger than that of the second slot 12, and the inner diameter of the fourth slot 14 is larger than that of the third slot 13; the inner wall of the first slot 11 comprises a second inclined surface 16 and a vertical surface from top to bottom, and the vertical surface and the bottom surface (the upper surface of the end wall 15) form a right-angle surface 17; the center of the end wall 15 is provided with a via hole 18 communicating the first slot hole 11 with the second slot hole 12, the lower edge of the via hole 18 of the end wall 15 is provided with a chamfer 19, and the chamfer 19 can guide the gas entering the first slot hole 11 from the second slot hole 12, so that the gas flows more smoothly.

In this embodiment, the ejector pin 2 comprises a head part 21 with a larger outer diameter and a rod part 22 with a smaller outer diameter, the head part 21 is in an inverted frustum structure, the bottom surface of the head part 21 has a first horizontal surface 23 and a side wall has a first inclined surface 24, a third inclined surface 25 is further arranged at the intersection of the bottom surface and the side wall, namely the intersection of the first horizontal surface 23 and the first inclined surface 24, the inclination of the third inclined surface 25 relative to the horizontal surface is smaller than that of the first inclined surface 24 relative to the horizontal surface, the first inclined surface 24 and the first horizontal surface 23 are both used for providing air tightness with the ejector pin 2, and the third inclined surface 25 can support the bottom surface of the head part 21 by air when the ejector pin is opened, so as to improve the performance of air-top mold opening.

In the embodiment, the outer diameter of the rod 22 is 2/3 of the aperture of the through hole 18 of the end wall 15, and a gap 1/3 is left as a gas flow interval between the first slot hole 11 and the second slot hole 12, so that the defect that the gas cap effect is poor and unstable due to the fact that the gas flow speed is high and the pressure is reduced because the gap between the rod 22 and the housing 1 is too small in the prior art can be avoided.

In the present embodiment, the stopper 3 includes a lower portion 31 having a larger outer diameter and an upper portion 32 having a smaller outer diameter, the outer diameter of the lower portion 31 is larger than the inner diameter of the second slot 12 and smaller than the inner diameter of the third slot 13, the outer diameter of the upper portion 32 is smaller than the inner diameter of the second slot 12, and the center of the upper portion 32 is provided with an internal threaded hole 33 that is threadedly coupled to the rod portion 22. The inner wall of the fourth slot 14 is provided with three limit sliding chutes 10 distributed along the axial direction, and the outer wall of the limit piece 3 is embedded in the limit sliding chutes 10 in an axially slidable manner. The outer wall of the limiting piece 3 is provided with three triangular convex blocks 34 distributed along the axial direction, the limiting sliding groove 10 is a triangular groove, the angle of each triangular convex block 34 is larger than that of each triangular groove, the design of each triangular convex block 34 and the corresponding limiting sliding groove 10 is beneficial to the insertion and assembly of the limiting piece 3, and when the mold is opened and closed, the limiting piece 3 can provide stable and reliable guiding support for the lifting of the ejector rod 2 along with the guiding function of the lifting of the ejector rod 2; particularly, when the horizontal section of the limiting part 3 is in a triangular structure, the contact surface between the limiting part 3 and the limiting sliding groove 10 is only in line contact, so that the friction force is very small, the service life of the limiting part 3 and the shell 1 is effectively prolonged, and the integral service life of the gas cap mechanism is prolonged.

In this embodiment, the top rod 2 inserted from the first slot 11 is connected with the limiting member 3 inserted from the fourth slot 14 by screw assembly, the outer diameter of the limiting member 3 is larger than the second slot 12 and smaller than the third slot 13, and two ends of the spring act between the end wall 15 and the limiting member 3; when the die is closed, part of the first horizontal surface 23 contacts with the second horizontal surface of the end wall 15 to form a first sealing end surface, part of the first inclined surface 24 contacts with the second inclined surface 16 of the upper part 32 of the inner wall of the first slot hole 11 to form a second sealing end surface, and a right-angle surface 17 of the lower part 31 of the inner wall of the first slot hole 11 forms a first annular cavity at the intersection of the first horizontal surface 23 and the first inclined surface 24; the outer wall of the limiting member 3 and the third slot hole 13 form a second annular cavity, the bottom of the limiting member 3 is provided with a plurality of support legs 35, air gaps 36 are arranged among the plurality of support legs 35, and the second annular cavity is communicated with the air inlet 41 of the cushion block 4 through the air gaps 36. First sealed terminal surface and second sealed terminal surface all help improving the leakproofness to gas under the compound die state, and first annular cavity and second annular cavity improve pneumatic effect as gaseous filling cavity and provide good support. The triangular convex block 34 of the limiting member 3 is formed on the outer wall of the supporting leg 35 and is integrally formed, and the ventilation gap between the supporting legs 35 can enable air to enter the second annular cavity from the ventilation gap when the air enters the bottom of the limiting member 3 from the air inlet 41 in a turning manner, and the air can form air-top thrust on the bottom surface of the limiting member 3 before the air turns.

The utility model discloses theory of operation, from the compound die state to the die sinking state: the air inlet channel 61 is communicated with an air source, after the air source is started, compressed air enters the air inlet holes 41 of the cushion block 4 from the air inlet channel 61, enters the second annular cavity from the air inlet holes 41 through the air inlet channel 61, enters the second slot hole 12 from the second annular cavity, if air leakage occurs on the first sealing end face, side air is filled in the first annular cavity, after the cavity or the hole is filled with air, the pressure exerted by the air on the limiting part 3 and the air cap is greater than the sum of the dead weight of the spring, the air cap and the limiting part 3, and the air cap and the limiting part 3 are driven to lift and eject.

Compared with the prior art, the gas cap mechanism of the mold provided by the embodiment of the utility model comprises a shell 1, a top rod 2, a limiting part 3, a cushion block 4 and a reset spring 5, wherein the top rod 2, the limiting part 3 and the spring are assembled in the shell 1, and the cushion block 4 is assembled to the bottom surface of the shell 1; the shell 1 is sequentially provided with a first slotted hole 11, a second slotted hole 12, a third slotted hole 13 and a fourth slotted hole 14 which are coaxially communicated from the top to the bottom, the inner diameter of the first slotted hole 11 is larger than that of the second slotted hole 12, an end wall 15 which is communicated between the first slotted hole 11 and the second slotted hole 12 is arranged, the inner diameter of the third slotted hole 13 is larger than that of the second slotted hole 12, and the inner diameter of the fourth slotted hole 14 is larger than that of the third slotted hole 13; the top rod 2 inserted from the first slot 11 is connected with the limiting piece 3 inserted from the fourth slot 14 through screw assembly, the outer diameter of the limiting piece 3 is larger than the second slot 12 and smaller than the third slot 13, and two ends of the spring act between the end wall 15 and the limiting piece 3; the ejector rod 2 comprises a head part 21 with a larger outer diameter and a rod part 22 with a smaller outer diameter, the head part 21 is in an inverted frustum structure, the bottom surface of the head part 21 is provided with a first horizontal surface 23, the side wall of the head part 21 is provided with a first inclined surface 24, when the die is closed, the part of the first horizontal surface 23 is contacted with a second horizontal surface of the end wall 15 to form a first sealing end surface, the part of the first inclined surface 24 is contacted with a second inclined surface 16 of an upper part 32 of the inner wall of the first slot hole 11 to form a second sealing end surface, and a first annular cavity is formed at the intersection of a right-angle surface 17 of a lower part 31 of the inner wall of the first slot hole 11, the first horizontal surface 23 and the first inclined surface 24; the outer wall of the limiting member 3 and the third slot hole 13 form a second annular cavity, the bottom of the limiting member 3 is provided with a plurality of support legs 35, air gaps are arranged among the plurality of support legs 35, and the second annular cavity is communicated with the air inlet 41 of the cushion block 4 through the air gaps. Overall structure is simple and the reliability is strong, head 21 at ejector pin 2 sets up the first sealed terminal surface of horizontally, improve ejector pin 2 to the gas tightness of first slotted hole 11, avoid the emergence of gas leakage phenomenon effectively, from first annular cavity, first slotted hole 11, second slotted hole 12, third slotted hole 13, fourth slotted hole 14, second annular cavity, ventilation gap and inlet port 41, in one go, the gas flow is unobstructed in the same direction as, difficult jam, be applicable to the high-pressure high-speed injection mold, can support the injection pressure load, can use on special-shaped face processing, and the installation on the mould is simple, it is efficient to take effect.

It should be understood by those skilled in the art that various features of the above-described embodiments can be combined in any combination, and for the sake of brevity, all possible combinations of features in the above-described embodiments are not described in detail, but rather, all combinations of features which are not inconsistent with each other should be construed as being within the scope of the present disclosure.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (8)

1. The gas cap mechanism of the die is characterized by comprising a shell (1), an ejector rod (2), a limiting piece (3), a cushion block (4) and a return spring (5), wherein the ejector rod (2), the limiting piece (3) and the spring are assembled in the shell (1), and the cushion block (4) is assembled to the bottom surface of the shell (1);

the shell (1) is sequentially provided with a first slotted hole (11), a second slotted hole (12), a third slotted hole (13) and a fourth slotted hole (14) which are coaxially communicated from top to bottom, the inner diameter of the first slotted hole (11) is larger than that of the second slotted hole (12), an end wall (15) which is communicated with the first slotted hole (11) and the second slotted hole (12) is arranged between the first slotted hole (11) and the second slotted hole (12), the inner diameter of the third slotted hole (13) is larger than that of the second slotted hole (12), and the inner diameter of the fourth slotted hole (14) is larger than that of the third slotted hole (13);

the ejector rod (2) inserted from the first slot hole (11) is in threaded assembly connection with the limiting piece (3) inserted from the fourth slot hole (14), the outer diameter of the limiting piece (3) is larger than that of the second slot hole (12) and smaller than that of the third slot hole (13), and two ends of the spring act between the end wall (15) and the limiting piece (3);

the ejector rod (2) comprises a head part (21) with a larger outer diameter and a rod part (22) with a smaller outer diameter, the head part (21) is of an inverted frustum structure, the bottom surface of the head part (21) is provided with a first horizontal surface (23) and the side wall of the head part is provided with a first inclined surface (24), when the ejector rod is matched with the ejector rod, part of the first horizontal surface (23) is contacted with a second horizontal surface of the end wall (15) to form a first sealing end surface, part of the first inclined surface (24) is contacted with a second inclined surface (16) of the upper part (32) of the inner wall of the first slotted hole (11) to form a second sealing end surface, and a right-angle surface (17) of the lower part (31) of the inner wall of the first slotted hole (11) and the intersection of the first horizontal surface (23) and the first inclined surface (24) form a first annular cavity;

the outer wall of the limiting part (3) and the third slotted hole (13) form a second annular cavity, a plurality of support legs (35) are arranged at the bottom of the limiting part (3), air gaps are formed among the support legs (35), and the second annular cavity is communicated with the air inlet holes (41) of the cushion block (4) through the air gaps.

2. The mechanism of claim 1, wherein the inner wall of the fourth slot (14) is provided with axially distributed limiting slide grooves (10), and the outer wall of the limiting member (3) is axially slidably embedded in the limiting slide grooves (10).

3. The airlock mechanism of a mold according to claim 2, wherein the outer wall of the retainer (3) has a plurality of triangular protrusions (34) distributed along the axial direction, the retaining runner (10) is a triangular groove, and the angle of the triangular protrusion (34) is greater than that of the triangular groove.

4. A die holder-on mechanism according to claim 3, wherein the horizontal cross-section of the retainer (3) is triangular.

5. A die holder-on mechanism as claimed in claim 1, wherein the stem portion (22) has an outer diameter of 2/3 of the diameter of the through hole (18) of the end wall (15).

6. The mechanism of claim 1, wherein the retainer (3) comprises a lower portion (31) having a larger outer diameter and an upper portion (32) having a smaller outer diameter, the lower portion (31) having an outer diameter larger than the inner diameter of the second slot (12) and smaller than the inner diameter of the third slot (13), the upper portion (32) having an outer diameter smaller than the inner diameter of the second slot (12), and the upper portion (32) having an internally threaded hole (33) at a middle portion thereof for being threadedly coupled to the rod portion (22).

7. A die holder-on mechanism according to claim 1, wherein the lower edge of the through hole (18) of the end wall (15) is provided with a chamfer (19).

8. The mechanism of claim 1, wherein a third inclined surface (25) is further provided between the first horizontal surface (23) and the first inclined surface (24) in the head portion (21) of the ejector pin (2), and the third inclined surface (25) has a smaller inclination with respect to the horizontal surface than the first inclined surface (24).

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