An injection mold cavity vent assembly

Abstract

The application relates to the technical field of injection mold, in particular to an injection mold cavity exhaust assembly, which comprises a fixed shell, a rotating disc, a fixed rod, a piston piece and a piston pin, the inner wall of the fixed shell is provided with a gas passing groove; the rotating disc is rotationally arranged at the inner end of the fixed shell, and the rotating disc is provided with a gas passing hole; the fixed rod is coaxially arranged at the inner end of the rotating disc, and the circumferential surface of the fixed rod is provided with a threaded groove; the piston piece is coaxially and slidably arranged on the fixed rod, the piston piece elastically abuts against the inner end of the rotating disc, the inner periphery of the piston piece is provided with a protruding block which is in sliding cooperation with the threaded groove, the inner periphery of the piston piece is provided with a pin cavity, the outer periphery of the piston piece is provided with a limiting strip which is in sliding cooperation with the gas passing groove, and the limiting strip is smaller than the gas passing groove; the piston pin is elastically and slidably arranged in the pin cavity, the piston pin coaxially penetrates the pin cavity and the gas passing hole in sequence, and the outer end of the piston pin is flush with the outer end of the rotating disc; the application can timely release the air in the cavity, and when the mold is opened, the piston pin can push out the pouring material in the gas passing hole to prevent blockage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection mold, in particular to an injection mold cavity exhaust assembly. BACKGROUND

[0002] Mold is used in industrial production to injection, blow molding, extrusion, die casting or forging forming, smelting, stamping and other methods to get the desired products of various molds and tools, the tool is used to make the molding object, the tool is composed of various parts, and different molds are composed of different parts.

[0003] In the casting of thermosetting plastics or natural rubber, the material is introduced into the cavity as a powder or as a paste and liquefied in the cavity by the corresponding pressure and the corresponding temperature, after the pressure and the temperature are reduced, the material is then hardened.

[0004] During the casting process of the mold, the air contained therein must escape; otherwise, sand holes, i.e. cavities, are formed in the cast. It is also possible to form a small number of large or a large number of small holes, cracks or gaps in the surface of the cast. In some cases, the casting material can not completely fuse with each other, or the compression is so high that the casting material is burned into a piece, i.e. reacts with the oxygen in the bubble, so openings must be provided in the casting mold to allow air to escape.

[0005] Chinese patent CN201080037875.9 discloses a casting mold with an exhaust device, comprising: at least two mutually adjacent molds, the molds enclosing a cavity, i.e. a cavity, which is accessible from the outside via at least one feed channel, and into which liquid casting material can be injected or pressed; and at least one exhaust port, the exhaust port extending from the cavity to the outer surface of one of the molds, and the exhaust port pointing generally in the direction of removing the hardened casting piece from the mold, and the exhaust port being closed by a pin-shaped exhaust device, wherein the end face of the exhaust device pointing towards the cavity is penetrated by small air holes, the air holes allowing air to pass through but blocking liquid casting material, and the air holes communicating with the outer surface of the exhaust device.

[0006] The small air holes of the exhaust device in the casting mold are extremely small and are easily blocked by the liquid casting material, which affects the exhaust, and the casting piece formed after the casting material cools down will produce burrs at the position of the small air holes, which also needs subsequent polishing, which is relatively cumbersome. SUMMARY

[0007] Therefore, it is necessary to provide an injection mold cavity exhaust assembly to solve the problems of the prior art.

[0008] To solve the problems of the prior art, the technical scheme adopted by the present application is:

[0009] The injection mold cavity exhaust assembly comprises a fixed shell, a rotating disc, a fixed rod, a piston piece and a piston pin, the inner wall of the fixed shell is provided with a gas passage groove extending along the axial direction and communicating with the outside; the rotating disc is rotationally arranged at the inner end of the fixed shell, one end of the rotating disc penetrates the inner end of the fixed shell and is flush with the outer end of the fixed shell, and the rotating disc is provided with a gas passage hole arranged along the circumferential direction thereof; the fixed rod is coaxially arranged at the inner end of the rotating disc, the fixed rod can rotate coaxially in the fixed shell, and the circumferential surface of the fixed rod is provided with a threaded groove coaxial with the fixed rod; the piston piece is coaxially and slidably sleeved on the fixed rod, and the piston piece elastically abuts against the inner end of the rotating disc, the inner periphery of the piston piece is provided with a protrusion extending along the radial direction thereof, the protrusion is in sliding fit with the threaded groove, the inner periphery of the piston piece is provided with a pin cavity extending along the axial direction thereof, and the outer periphery of the piston piece is provided with a limiting strip in sliding fit with the gas passage groove, the limiting strip is smaller than the gas passage groove; the piston pin is elastically and slidably arranged in the pin cavity, the piston pin coaxially penetrates the pin cavity and the gas passage hole in sequence, and the outer end of the piston pin is flush with the outer end of the rotating disc.

[0010] Preferably, the first spring and the third spring are further included, the first spring is arranged in the fixed shell, two ends of the first spring respectively abut against the inner end of the fixed shell and the piston pin, and the axis of the first spring is coaxial with the piston piece; the third spring is arranged in the pin cavity, and two ends of the third spring respectively abut against the piston pin and the opposite end of the pin cavity.

[0011] Preferably, one end of the fixed shell is open, and the outer threaded plug is further included, the outer threaded plug is coaxially screwed in the open end of the fixed shell, and two ends of the first spring respectively abut against the outer threaded plug and the opposite end of the piston piece.

[0012] Preferably, the first thrust bearing is further included, the first thrust bearing is coaxially arranged at one end of the piston piece facing the first spring, and two ends of the first spring respectively abut against the opposite ends of the first thrust bearing and the outer threaded plug.

[0013] Preferably, the piston piece comprises a first plug block, a second plug block and a bolt, the first plug block and the first plug block are coaxially fixedly connected through the bolt, and the pin cavity is distributed in the first plug block along the axial direction.

[0014] Preferably, one end of the second plug block facing the first plug block is provided with a multi-angle groove coaxial with the second plug block, and the piston piece further comprises a multi-angle cylinder, the multi-angle cylinder is embeddedly arranged in the multi-angle groove, and the protrusion is circumferentially arranged on the inner periphery of the multi-angle cylinder.

[0015] Preferably, the rotating disc comprises a disc coaxially rotationally arranged in the fixed shell, and a conical disc coaxially arranged at one end of the disc, the disc abuts against the inner end of the fixed shell, the conical disc coaxially penetrates the fixed shell and is flush with the outer end of the fixed shell, and the outer diameter of the disc is greater than the outer diameter of the conical disc.

[0016] Preferably, the first thrust bearing is further included, the first thrust bearing is coaxially arranged between the disc and the inner end of the fixed shell.

[0017] Preferably, the external thread plug is provided with a spline hole coaxial with the external thread plug, the exhaust assembly further comprises an internal thread plug, a second spring and a spline barrel, the spline barrel is coaxially screwed into the spline hole, the spline barrel is coaxially and slidingly arranged in the spline hole, the second spring is arranged in the spline hole, two ends of the second spring abut against opposite ends of the internal thread plug and the spline barrel respectively, and the piston pin is coaxially and rotationally matched with the spline barrel.

[0018] Preferably, the bearing is further included, an outer ring of the bearing is fixedly connected with an inner periphery of the spline barrel coaxially, and an inner ring of the bearing is fixedly connected with the piston pin coaxially.

[0019] The beneficial effects of the present application compared with the prior art are:

[0020] 1. The present application can release the air in the cavity in time, avoid sand holes or notches in the castings, and when the cavity is depressurized and cooled, the rotating disc can drive the air hole to rotate, so that the unhardened casting material in the air hole is separated from the casting material in the cavity, thereby preventing burrs in the hardened castings in the air hole, and when the mold is opened, the piston pin can eject the casting material in the air hole for the next casting;

[0021] 2. The first spring can elastically arrange the piston in the fixed shell, and the third spring can elastically arrange the piston pin in the pin cavity, so as to facilitate exhaust and discharge;

[0022] 3. The external thread plug of the barrel can adjust the elastic force of the first spring, and then different exhaust pressures can be adjusted according to different cavity pressures;

[0023] 4. The first plug and the second plug constitute the piston, and the piston pin can be elastically and slidingly arranged in the pin cavity;

[0024] 5. The rotating disc is composed of a disc and a conical disc, so that the disc can rotate in the fixed shell, the conical disc passes through the inner end of the fixed shell coaxially and rotationally matches with the fixed shell, and then the rotating disc can be stably arranged in the fixed shell. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a perspective view of the exhaust assembly of the present application;

[0026] Figure 2 is a side view of the exhaust assembly of the present application;

[0027] Figure 3 is Figure 2 a perspective view of the A-A section of

[0028] Figure 4 is Figure 2 a sectional view of the A-A section of

[0029] Figure 5 is a perspective exploded view of the exhaust assembly of the present application;

[0030] Figure 6 is a perspective view of the piston piece and the rotating disc of the present application;

[0031] Figure 7 is a perspective exploded view of the piston piece and the rotating disc of the present application;

[0032] Figure 8 is a perspective view of the fixed rod and the polygonal cylinder of the present application;

[0033] Figure 9 is a side view of the fixed rod and the polygonal cylinder of the present application.

[0034] Reference numerals in the drawings are:

[0035] 1-fixed shell; 1a-air passage groove; 1b-external threaded plug; 1b1-key hole; 2-rotating disc; 2a-air passage hole; 2b-disc; 2c-conical disc; 3-fixed rod; 3a-threaded groove; 4-piston piece; 4a-bump; 4f-pin cavity; 4h-limiting strip; 4g-third spring; 4b-first plug; 4c-second plug; 4c1-polygonal groove; 4d-bolt; 4e-polygonal cylinder; 5-piston pin; 6-first spring; 7-first thrust bearing; 8-second thrust bearing; 9a-internal threaded plug; 9b-second spring; 9c-key cylinder; 9d-bearing. DETAILED DESCRIPTION

[0036] In order to further understand the features, technical means and specific purposes and functions of the present application, the present application is described in further detail below in combination with the drawings and specific embodiments.

[0037] As shown in Figures 1-9 , the present application provides:

[0038] An injection mold cavity exhaust assembly, comprising a fixed shell 1, a rotating disc 2, a fixed rod 3, a piston piece 4 and a piston pin 5,

[0039] The inner wall of the fixed shell 1 is provided with an air passage groove 1a extending along its axial direction and communicating with the outside;

[0040] The rotating disc 2 is rotationally arranged at the inner end of the fixed shell 1, one end of the rotating disc 2 penetrates the inner end of the fixed shell 1 and is flush with the outer end of the fixed shell 1, and the rotating disc 2 is provided with air passage holes 2a arranged along its circumferential direction;

[0041] The fixed rod 3 is coaxially arranged at the inner end of the rotating disc 2, the fixed rod 3 can rotate coaxially in the fixed shell 1, and the circumferential surface of the fixed rod 3 is provided with a threaded groove 3a coaxial therewith;

[0042] The piston 4 is coaxially sleeved on the fixed rod 3 and elastically abuts against the inner end of the rotating disc 2, the inner periphery of the piston 4 is provided with a protrusion 4a extending in the radial direction thereof, the protrusion 4a is in sliding fit with the threaded groove 3a, the inner periphery of the piston 4 is provided with a pin cavity 4f extending in the axial direction thereof, and the outer periphery of the piston 4 is provided with a limiting strip 4h in sliding fit with the air passage 1a, the limiting strip 4h is smaller than the air passage 1a.

[0043] The piston pin 5 is elastically sleeved in the pin cavity 4f, the piston pin 5 coaxially penetrates the pin cavity 4f and the air passage 2a in sequence, and the outer end of the piston pin 5 is flush with the outer end of the rotating disc 2.

[0044] Based on the above embodiment, the technical problem to be solved by the present application is that the small air hole of the existing exhaust device is easy to be blocked, and the pouring part is easy to form burrs at the small air hole. Therefore, the present application can release the air in the cavity in time, avoid the pouring part from having sand eyes or notches, and when the cavity is depressurized and cooled, the rotating disc 2 can drive the air passage 2a to rotate, so that the unhardened pouring material in the air passage 2a is separated from the pouring material in the cavity, thereby preventing the hardened pouring part from having burrs in the air passage 2a, and when the mold is opened, the piston pin 5 can push out the pouring material in the air passage 2a, so as to facilitate the next pouring.

[0045] The cavity has a feeding port and at least one exhaust port, the exhaust port is located at the end of the cavity, the exhaust assembly is arranged in the exhaust port, and the outer end of the rotating disc 2 is located in the cavity;

[0046] The liquid pouring material is injected into the cavity through the feeding port, the pressure in the cavity gradually increases, the piston pin 5 is coaxially inserted into the air passage 2a, and the piston pin 5 is in elastic sliding fit with the pin cavity 4f;

[0047] The piston pin 5 moves in the air passage 2a and the pin cavity 4f against the elastic force until the piston pin 5 is completely separated from the air passage 2a, the air presses the end surface of the piston 4, the piston 4 slides in the fixed shell 1 against the elastic force, the limiting strip 4h is in sliding fit with the air passage 1a, which can prevent the piston 4 from rotating in the fixed shell 1, and because the pin cavity 4f is smaller than the air passage 1a, the pin cavity 4f will not block the air passage 1a;

[0048] Because the protrusion 4a is in sliding fit with the threaded groove 3a, the piston 4 is slidably arranged in the fixed shell 1, and the piston 4 cannot rotate, so that the rotating disc 2 can rotate relative to the fixed shell 1;

[0049] When the piston pin 5 is separated from the air passage 2a and the piston 4 is separated from the rotating disc 2, the air passage 2a, the rotating disc 2 and the piston 4 are connected to form a communication channel with the air passage 1a, so that the air in the cavity can be discharged outward;

[0050] When the liquid casting material fills the cavity, a small amount of liquid casting material will enter the through-hole 2a. When the cavity is cooled and depressurized, the piston 4 is gradually reset due to the elastic force, and the piston 4 is abutted against the inner end of the rotating disc 2 again under the elastic force. In this process, the rotating disc 2 can rotate relative to the fixed shell 1 when the piston 4 is reset, so that the casting material in the through-hole 2a and the casting material in the cavity are separated from each other, thereby realizing the separate hardening of the casting and the residual casting material in the through-hole 2a.

[0051] The piston pin 5 is re-inserted and sealed in the through-hole 2a under the elastic force, so that the liquid casting material in the through-hole 2a cannot enter the inner cavity of the fixed shell 1. At this time, a small amount of liquid casting material exists in the through-hole 2a, which will cause the piston pin 5 to be unable to be completely reset.

[0052] After the mold is opened, the hardened casting is separated from the cavity, and the piston pin 5 is completely reset under the elastic force, so that the piston pin 5 can push the residual casting material in the through-hole 2a outward, thereby preventing blockage.

[0053] Further,

[0054] Further, the first spring 6 is arranged in the fixed shell 1, and the two ends of the first spring 6 are abutted against the piston pin 5 and the inner end of the fixed shell 1, respectively. The axis of the first spring 6 is coaxial with the piston 4. The third spring 4g is arranged in the pin cavity 4f, and the two ends of the third spring 4g are abutted against the piston pin 5 and the opposite end of the pin cavity 4f, respectively.

[0055] Based on the above embodiment, the technical problem to be solved by the present application is how the piston 4 is elastically abutted against the inner end of the rotating disc 2 in the fixed shell 1, and how the piston 4 is elastically arranged in the pin cavity 4f. To this end, the first spring 6 is arranged in the fixed shell 1, and the two ends of the first spring 6 are abutted against the piston pin 5 and the inner end of the fixed shell 1, respectively. Thus, the piston 4 can be elastically abutted against the inner end of the rotating disc 2 under the elastic force of the first spring 6, and the first spring 6 can elastically reset the piston 4, so that the piston pin 5 can push the casting material outward from the through-hole 2a.

[0056] The third spring 4g is coaxially arranged in the pin cavity 4f, so that the piston pin 5 needs to overcome the elastic force of the third spring 4g to completely enter the pin cavity 4f, thereby enabling the piston 4 to be pushed to exhaust.

[0057] As shown in FIGS. Figure 4 and Figure 5 Further,

[0058] The fixed shell 1 is opened at one end, and further comprises an externally threaded plug 1b coaxially screwed into the open end of the fixed shell 1, and the two ends of the first spring 6 abut against the opposite ends of the externally threaded plug 1b and the piston member 4 respectively.

[0059] Based on the above embodiment, the technical problem to be solved by the present application is how to adjust the elastic force of the first spring 6 on the piston member 4. To this end, the present application makes one end of the fixed shell 1 open, and coaxially screws the externally threaded plug 1b into the open end of the fixed shell 1, and adjusts the distance between the externally threaded plug 1b and the piston member 4 by rotating the externally threaded plug 1b, thereby adjusting the elastic force of the first spring 6, so that the piston member 4 can abut against the inner end of the rotating disc 2 at different pressures, thereby adapting to different cavity pressures in the injection molding state.

[0060] As shown in Figure 4 and Figure 5 further:

[0061] Further comprising a first thrust bearing 7 coaxially arranged at one end of the piston member 4 facing the first spring 6, and the two ends of the first spring 6 abut against the opposite ends of the first thrust bearing 7 and the externally threaded plug 1b respectively.

[0062] Based on the above embodiment, the technical problem to be solved by the present application is how to reduce the friction between the piston member 4 and the first spring 6 to prevent the first spring 6 from scratching the inner end face of the piston member 4. To this end, the present application arranges the first thrust bearing 7 coaxially between the first spring 6 and the piston member 4, avoiding direct contact between the piston member 4 and the first spring 6, thereby preventing scratching.

[0063] As shown in Figure 4 and Figure 7 further:

[0064] The piston member 4 comprises a first plug 4b, a second plug 4c and a bolt 4d, the first plug 4b and the first plug 4b are coaxially fixedly connected by the bolt 4d, and the pin cavities 4f are distributed in the first plug 4b in the axial direction.

[0065] Based on the above embodiment, the technical problem to be solved by the present application is how to arrange the pin cavities 4f in the piston member 4. To this end, the present application makes the piston member 4 a split member, specifically the first plug 4b and the second plug 4c are fixedly connected by the bolt 4d, and the pin cavities 4f are arranged in the first plug 4b in the circumferential direction. After the piston pin 5 is elastically and slidably arranged in the pin cavity 4f, the second plug 4c is used to block the pin cavity 4f to prevent the piston pin 5 from being separated from the pin cavity 4f.

[0066] As shown in Figure 4 and Figure 5 further:

[0067] The second plug 4c is provided with a polygonal slot 4c1 coaxial with the second plug 4c at one end of the second plug 4c towards the first plug 4b, and the piston member 4 further comprises a polygonal cylinder 4e which is embedded in the polygonal slot 4c1, and the protrusion 4a is circumferentially arranged at the inner periphery of the polygonal cylinder 4e.

[0068] Based on the above embodiment, the technical problem to be solved by the present application is how to arrange the protrusion 4a extending radially along the inner periphery of the piston member 4. To this end, the present application arranges the polygonal slot 4c1 coaxial with the second plug 4c at one end of the second plug 4c towards the first plug 4b, and embeds the polygonal cylinder 4e in the polygonal slot 4c1, so as to prevent the polygonal cylinder 4e from rotating relative to the second plug 4c, and the protrusion 4a is arranged at the inner periphery of the polygonal cylinder 4e, so as to facilitate replacement and installation.

[0069] As shown in Figure 4 and Figure 5 Further, the present application comprises the following steps:

[0070] The rotating disc 2 comprises a disc 2b coaxially arranged in the fixed shell 1, and a conical disc 2c coaxially arranged at one end of the disc 2b, the disc 2b abuts against the inner end of the fixed shell 1, the conical disc 2c coaxially penetrates the fixed shell 1 and is flush with the outer end of the fixed shell 1, and the outer diameter of the disc 2b is greater than the outer diameter of the conical disc 2c.

[0071] Based on the above embodiment, the technical problem to be solved by the present application is how to arrange the rotating disc 2 in the fixed shell 1. To this end, the present application comprises the disc 2b and the conical disc 2c, and the outer diameter of the disc 2b is greater than the outer diameter of the conical disc 2c, so that the disc 2b can rotate in the fixed shell 1, the conical disc 2c can penetrate the inner end of the fixed shell 1 and be flush with the outer end of the fixed shell 1, and the liquid casting material can be prevented from overflowing into the fixed shell 1 from the gap.

[0072] As shown in Figure 4 and Figure 5 Further, the present application comprises the following steps:

[0073] The present application further comprises a first thrust bearing 7 coaxially arranged between the disc 2b and the inner end of the fixed shell 1.

[0074] Based on the above embodiment, the technical problem to be solved by the present application is how to reduce the rotating friction of the disc 2b and the fixed shell 1. To this end, the present application arranges the second thrust bearing 8 between the disc 2b and the inner end of the fixed shell 1, so that the static friction of the disc 2b and the fixed shell 1 is converted into rolling friction, the wear between the disc 2b and the fixed shell 1 is prevented, the gap is enlarged, and the liquid casting material can overflow into the fixed shell 1 through the enlarged gap.

[0075] Further, the present application comprises the following steps:

[0076] The outer threaded plug 1b is internally provided with a spline hole 1b1 coaxial with the outer threaded plug 1b, the exhaust assembly further comprises an inner threaded plug 9a, a second spring 9b and a spline barrel 9c, the spline barrel 9c is coaxially screwed into the spline hole 1b1, the spline barrel 9c is coaxially and slidingly arranged in the spline hole 1b1, the second spring 9b is arranged in the spline hole 1b1, and the two ends of the second spring 9b abut against opposite ends of the inner threaded plug 9a and the spline barrel 9c respectively, and the piston pin 5 is coaxially and rotationally matched with the spline barrel 9c.

[0077] Based on the above embodiment, the technical problem to be solved by the present application is how to adjust the rotating friction of the disc 2b. To this end, the present application slidingly arranges the spline barrel 9c in the spline hole 1b1, and screws the inner threaded plug 9a into the spline hole 1b1, and elastically connects the inner threaded plug 9a and the spline barrel 9c through the second spring 9b, and the spline barrel 9c is connected with the fixed rod 3, so that the disc 2b can elastically abut against the inner end of the fixed shell 1 without affecting the rotation of the fixed rod 3, and the greater the elastic force, the greater the rotating friction of the disc 2b.

[0078] As shown in Figure 4 and Figure 5 Further, as shown in

[0079] Further comprising a bearing 9d, the outer ring of the bearing 9d is fixedly connected with the inner periphery of the spline barrel 9c coaxially, and the inner ring of the bearing 9d is fixedly connected with the piston pin 5 coaxially.

[0080] Based on the above embodiment, the technical problem to be solved by the present application is how to stably connect the fixed rod 3 and the spline barrel 9c. To this end, the present application can stably connect the spline barrel 9c and the fixed rod 3 through the bearing 9d, so that the fixed rod 3 can stably rotate coaxially relative to the spline barrel 9c.

[0081] The present application can timely release the air in the cavity, avoid the occurrence of sand holes or gaps in the castings, and when the cavity is cooled by decompression, the rotating disc 2 can drive the air passage 2a to rotate, so that the unhardened casting material in the air passage 2a is separated from the casting material in the cavity, thereby preventing burrs from occurring in the air passage 2a of the hardened castings, and when the mold is opened, the piston pin 5 can eject the casting material in the air passage 2a, so as to facilitate the next casting.

[0082] The above embodiments only express one or several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An injection mold cavity vent assembly, comprising: The utility model relates to a piston device, including fixed shell (1), rotating disc (2), fixed rod (3), piston piece (4) and piston pin (5), The inner wall of the fixed shell (1) is provided with a gas passage (1a) extending along the axial direction and communicating with the outside; The rotating disc (2) is rotatably arranged in the inner end of the fixed shell (1), one end of the rotating disc (2) penetrates the inner end of the fixed shell (1) and is flush with the outer end of the fixed shell (1), and the rotating disc (2) is provided with a gas hole (2a) arranged along the circumferential direction thereof; The fixed rod (3) is coaxially arranged in the inner end of the rotating disc (2), the fixed rod (3) can rotate coaxially in the fixed shell (1), and the circumferential surface of the fixed rod (3) is provided with a threaded groove (3a) coaxial with the fixed rod (3); The piston piece (4) is coaxially and slidably arranged on the fixed rod (3), and the piston piece (4) is elastically abutted against the inner end of the rotating disc (2), the inner periphery of the piston piece (4) is provided with a protrusion (4a) extending along the radial direction thereof, the protrusion (4a) is slidably connected with the threaded groove (3a), the inner periphery of the piston piece (4) is provided with a pin cavity (4f) extending along the axial direction thereof, and the outer periphery of the piston piece (4) is provided with a limiting strip (4h) slidably connected with the gas passage (1a), and the limiting strip (4h) is smaller than the gas passage (1a); The piston pin (5) is elastically and slidably arranged in the pin cavity (4f), the piston pin (5) penetrates the pin cavity (4f) and the gas hole (2a) coaxially, and the outer end of the piston pin (5) is flush with the outer end of the rotating disc (2).

2. An injection mold cavity vent assembly as defined in claim 1, wherein, Further comprising a first spring (6) and a third spring (4g), the first spring (6) is arranged in the fixed shell (1), the two ends of the first spring (6) are respectively abutted against the inner end of the fixed shell (1) and the piston pin (5), and the axis of the first spring (6) is coaxial with the piston piece (4); the third spring (4g) is arranged in the pin cavity (4f), and the two ends of the third spring (4g) are respectively abutted against the piston pin (5) and the opposite end of the pin cavity (4f).

3. An injection mold cavity vent assembly as defined in claim 2, wherein, One end of the fixed shell (1) is open, further comprising an external thread plug (1b), the external thread plug (1b) is coaxially screwed in the open end of the fixed shell (1), and the two ends of the first spring (6) are respectively abutted against the opposite end of the external thread plug (1b) and the piston piece (4).

4. An injection mold cavity vent assembly as defined in claim 2, wherein, Further comprising a first thrust bearing (7), the first thrust bearing (7) is coaxially arranged at one end of the piston piece (4) facing the first spring (6), and the two ends of the first spring (6) are respectively abutted against the opposite end of the external thread plug (1b) and the first thrust bearing (7).

5. An injection mold cavity vent assembly as defined in any of claims 1-4, wherein, The piston piece (4) comprises a first plug (4b), a second plug (4c) and a bolt (4d), the first plug (4b) and the first plug (4b) are coaxially fixedly connected through the bolt (4d), and the pin cavity (4f) is distributed in the first plug (4b) along the axial direction.

6. An injection mold cavity vent assembly as defined in claim 5, wherein, The second plug (4c) is provided with a polygonal groove (4c1) coaxial with the second plug (4c) at one end facing the first plug (4b), and the piston piece (4) further comprises a polygonal cylinder (4e), the polygonal cylinder (4e) is embedded in the polygonal cylinder (4e), and the protrusion (4a) is circumferentially arranged on the inner periphery of the polygonal cylinder (4e).

7. An injection mold cavity vent assembly as defined in any of claims 1-4, wherein, The rotating disc (2) comprises a disc (2b) coaxially arranged in the fixed shell (1), and a conical disc (2c) coaxially arranged at one end of the disc (2b), the disc (2b) abuts against the inner end of the fixed shell (1), the conical disc (2c) coaxially penetrates the fixed shell (1) and is flush with the outer end of the fixed shell (1), and the outer diameter of the disc (2b) is larger than the outer diameter of the conical disc (2c).

8. An injection mold cavity vent assembly as defined in claim 7, wherein, The rotating disc (2) further comprises a first thrust bearing (7) coaxially arranged between the disc (2b) and the inner end of the fixed shell (1).

9. An injection mold cavity vent assembly as defined in claim 7, wherein, The outer threaded plug (1b) is internally provided with a spline hole (1b1) coaxial with the outer threaded plug (1b), the exhaust assembly further comprises an inner threaded plug (9a), a second spring (9b) and a spline barrel (9c), the spline barrel (9c) is coaxially screwed in the spline hole (1b1), the spline barrel (9c) is coaxially and slidingly arranged in the spline hole (1b1), the second spring (9b) is arranged in the spline hole (1b1), and the two ends of the second spring (9b) abut against the opposite ends of the inner threaded plug (9a) and the spline barrel (9c) respectively, and the piston pin (5) is coaxially and rotationally matched with the spline barrel (9c).

10. An injection mold cavity vent assembly as defined in claim 9, wherein, The rotating disc (2) further comprises a bearing (9d), the outer ring of the bearing (9d) is fixedly connected with the inner periphery of the spline barrel (9c) in a coaxial manner, and the inner ring of the bearing (9d) is fixedly connected with the piston pin (5) in a coaxial manner.

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