Gas filling mechanism and injection molding machine

Abstract

The invention discloses a gas filling mechanism and an injection molding machine, and relates to the field of injection molding. The first filling assembly comprises an asbestos gauze which is arranged outside the injection molding barrel in a sleeving manner, and a first filling port is formed in the asbestos gauze; the device further comprises a gas supply assembly used for providing protective gas, and the gas supply assembly communicates with the first filling port. According to the gas filling mechanism for the injection molding machine, the position, located outside the injection molding nozzle, of the injection molding barrel is sleeved with the asbestos gauze cover, and the asbestos gauze cover can achieve a heat preservation effect on the position of the injection molding nozzle; and the protective gas in the gas supply assembly is injected into the asbestos gauze cover, and under the action of a net structure of the asbestos gauze cover, the protective gas is shunted, so that on one hand, the protective gas can be more uniformly distributed at the position of the injection molding nozzle, and on the other hand, the duration of the protective gas can be prolonged, so that the oxygen isolation effect can be improved.

Description

Technical Field

[0001] The present invention relates to the field of injection molding, and in particular to a gas filling mechanism and an injection molding machine. Background Art

[0002] Injection molding is a widely used molding process that involves melting raw materials (which can range from plastics to metals and magnets) and injecting them into a mold under high pressure, where they are cooled to form the final product. This process is suitable for mass-producing complex parts of the same shape, and is commonly used in industries such as automotive, packaging, and electronics.

[0003] For example, the Chinese patent document, CN104191578A, published on December 10, 2014, and titled "An Injection Molding Machine and Injection Molding Method Using the Same," includes a hopper for placing material and an inert gas generator connected to the hopper for filling the hopper with inert gas. The injection molding machine provided by the present invention plasticizes the material under the protection of nitrogen, effectively solving the problem of yellowing of the light guide plate caused by oxidative decomposition of the material. It is low-cost, easy to implement, and highly reliable.

[0004] The shortcoming of the existing technology is that when some easily oxidized products are injection molded, there is a lack of a targeted atmosphere system at the nozzle position (that is, using nitrogen or some inert gases to isolate the oxygen in the air to protect the injection molded products), which makes it difficult to meet the low-oxygen environment at the nozzle injection position, thereby reducing the overall quality of the injection molded products. Summary of the Invention

[0005] The object of the present invention is to provide a gas filling mechanism and an injection molding machine to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: A gas filling mechanism for an injection molding machine includes a first filling assembly provided on an injection molding cylinder; The first filling assembly includes an asbestos mesh cover sleeved on the outside of the injection molding cylinder, and the asbestos mesh cover is provided with a first filling port; It also includes a gas supply component for providing protective gas, and the gas supply component is connected to the first filling port.

[0007] In the above-mentioned gas filling mechanism for an injection molding machine, an annular groove is provided on the outer peripheral surface of the injection cylinder.

[0008] The above-mentioned gas filling mechanism for an injection molding machine also includes a second filling assembly arranged on the injection cylinder, the second filling assembly includes a second filling port arranged on the injection cylinder, and a feed hopper is provided on the injection cylinder, and the second filling port is located below the feed hopper.

[0009] An injection molding machine comprises the above-mentioned gas filling mechanism for the injection molding machine, a feed hopper and an injection molding cylinder.

[0010] The above-mentioned injection molding machine further includes a screw rotatably arranged inside the injection molding cylinder, and the screw is provided with an exhaust groove.

[0011] In the above-mentioned injection molding machine, a movable groove is provided on the injection molding cylinder, a filter portion is provided on the movable groove, a transmission ring is rotatably provided on the injection molding cylinder, and the second filling port is provided on the transmission ring; It also includes a power assembly for driving the transmission ring to rotate.

[0012] In the above-mentioned injection molding machine, the power assembly includes an incomplete gear ring arranged on the transmission ring and a gear plate meshing with the incomplete gear ring, a transmission disk is arranged on the screw, a drive shaft is arranged on the transmission disk, a connecting plate is arranged on the gear plate, a transmission hole is opened on the connecting plate, and the drive shaft is slidably connected to the transmission hole.

[0013] In the above-mentioned injection molding machine, a blocking portion is provided on the second filling port, an arc-shaped groove adapted to the blocking portion is opened on the side wall of the movable groove, and the blocking portion is slidably connected to the arc-shaped groove.

[0014] In the above-mentioned injection molding machine, a breaking rod is rotatably provided inside the feed hopper, a transmission plate is provided on the breaking rod, a transmission rod is fixedly connected to the transmission ring, and the transmission rod is slidably connected to the transmission plate.

[0015] In the above-mentioned injection molding machine, the injection molding cylinder is provided with a dredging component for cleaning the exhaust groove.

[0016] In the above technical solution, the present invention provides a gas filling mechanism for an injection molding machine, wherein an asbestos mesh cover is provided on the injection molding cylinder at a position outside the injection molding nozzle, and the asbestos mesh cover can play a role in heat preservation at the injection molding nozzle position; In addition, a first filling port is provided on the asbestos mesh cover, and the air supply component is connected to the first filling port, so that the protective gas in the air supply component can be injected into the asbestos mesh cover. Under the action of the mesh structure of the asbestos mesh cover, a diversion effect is played on the protective gas. On the one hand, the protective gas can be distributed more evenly at the injection nozzle position, and on the other hand, the duration of the protective gas can be increased, thereby improving the oxygen isolation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention; Figure 2 Provides a cross-sectional structural schematic diagram of an embodiment of the present invention; Figure 3 A schematic front view of the structure of another embodiment of the present invention; Figure 4 A schematic diagram of a partial structure provided for another embodiment of the present invention; Figure 5 A schematic diagram of a partial cross-sectional structure provided in another embodiment of the present invention; Figure 6 A schematic diagram of a partial cross-sectional structure from another perspective provided by another embodiment of the present invention; Figure 7 Another perspective provided by another embodiment of the present invention (which is related to Figure 6 A schematic diagram of a partial cross-section structure (the viewing angles are perpendicular to each other); Figure 8 A schematic diagram of the overall structure of a movable ring provided by another embodiment of the present invention; Figure 9 A schematic diagram of the unfolding of a movable ring provided in yet another embodiment of the present invention; Figure 10 A schematic diagram of a drive shaft driving process provided in yet another embodiment of the present invention.

[0019] Description of reference numerals: 1. Injection molding cylinder; 101. Cylinder section; 102. Injection molding nozzle; 2. Asbestos mesh cover; 3. First filling port; 4. Annular groove; 5. Second filling port; 6. Feed hopper; 7. Screw; 8. Exhaust groove; 9. Movable groove; 10. Filter unit; 11. Transmission ring; 12. Incomplete gear ring; 13. Gear plate; 14. Transmission disc; 15. Drive shaft; 16. Connecting plate; 17. Transmission hole; 18. Sliding seat; 19. Blocking unit; 20. Arc groove; 21. Breaking rod; 22. Transmission plate; 23. Transmission rod; 24. Movable ring; 25. Wave groove; 26. Slide rod; 27. Cleaning unit; 28. Through hole; 29. ​​Annular receiving groove. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] In the description of the present invention, it is to be understood that Figure 3 The position of the middle feed hopper 6 relative to the injection cylinder 1 is above, and vice versa. The terms "center", "length", "width", "degrees", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0022] Reference Figure 1-10 , an embodiment of the present invention provides a gas filling mechanism for an injection molding machine, comprising a first filling assembly provided on an injection molding cylinder 1; The first filling assembly includes an asbestos mesh cover 2 sleeved on the outside of the injection molding cylinder 1, and a first filling port 3 is provided on the asbestos mesh cover 2; It also includes a gas supply component (not shown), which is used to provide protective gas. The gas supply component is connected to the first filling port 3.

[0023] Specifically, the injection molding cylinder 1 includes a cylindrical section 101 and an injection molding nozzle 102 connected to the cylindrical section 101. The injection molding nozzle 102 is used in conjunction with a mold, and a local area of ​​the cylindrical section 101 is provided with an electric heating component (not shown). During injection molding, granular raw materials are added to the inside of the cylindrical section 101. The raw materials heated by the heating component are in a molten state. Then, the molten raw materials are pushed into the mold through a conveying mechanism such as a screw thread. After cooling, molding, and demolding, an injection molded product is obtained. This is a prior art and will not be described in detail. One of the core innovations of the embodiment of the present invention is that an asbestos mesh cover 2 is provided on the outside of the injection molding nozzle 102, and an asbestos mesh cover 2 is provided. A first filling port 3 is provided, and the first filling port 3 is connected to the gas supply component. The gas supply component can be an existing energy supply structure such as an air pump. The protective gas is preferably one of nitrogen, helium, and argon. In this embodiment, nitrogen is preferably selected. The effect of such a setting is that the asbestos mesh cover 2 can have an insulation effect on the injection nozzle 102 position. Moreover, during injection molding, the protective gas can be injected into the asbestos mesh cover 2 through the gas supply component. Under the action of the mesh structure of the asbestos mesh cover 2, a diversion effect is played on the protective gas. On the one hand, the nitrogen can be distributed more evenly at the injection nozzle 102 position. On the other hand, the survival time of the nitrogen can be increased, thereby improving its isolation effect on oxygen.

[0024] Furthermore, an annular groove 4 is formed on the outer circumference of the injection molding cylinder 1. Specifically, the annular groove 4 is arranged corresponding to the position of the asbestos mesh cover 2. When nitrogen is added from the first filling port 3, the nitrogen fills the annular groove 4 and penetrates into the asbestos mesh cover 2 from the annular groove 4, thereby increasing the contact area between the nitrogen and the asbestos mesh cover 2, thereby increasing the distribution speed of the nitrogen.

[0025] Furthermore, the molding machine further includes a second filling assembly disposed on the injection molding cylinder 1, the second filling assembly including a second filling port 5 disposed on the injection molding cylinder 1, the injection molding cylinder 1 being provided with a feed hopper 6, and the second filling port 5 being located below the feed hopper 6. Specifically, the feed hopper 6 is disposed above the injection molding cylinder 1. Such a configuration is such that, during injection molding, raw materials will enter the cavity of the injection molding cylinder 1 from the feed hopper 6, and nitrogen will be added to the injection molding cylinder 1 from the second filling port 5 below the injection molding cylinder 1 to cover the surface of the raw materials, forming a nitrogen barrier to protect the raw materials.

[0026] It should be noted that, in the raw material preparation stage, the raw materials are first loaded into a powder tank (not shown) with multiple valves, and nitrogen is filled into the powder tank from the position of one of the valves, and the remaining outlet valves are opened. After 2 minutes of oxygen removal treatment, the remaining outlet valves are closed to fill the powder tank with nitrogen to remove the air contained in the raw materials as much as possible, and then the feed hopper 6 is connected to the powder tank to feed the material into the feed hopper 6.

[0027] Another embodiment of the present invention provides an injection molding machine, which includes the above-mentioned gas filling mechanism for the injection molding machine, a feed hopper 6 and an injection cylinder 1.

[0028] Furthermore, it also includes a screw 7 that is rotated and arranged inside the injection molding cylinder 1, and an exhaust groove 8 is opened on the screw 7. Specifically, the screw 7 is provided with a cylindrical section and a threaded section, the threaded section is used to convey the raw materials, and the exhaust groove 8 is preferably a linear groove or a spiral groove, and is arranged on the outer circumference of the cylindrical section. The exhaust groove 8 connects the internal space of the injection molding cylinder 1 with the external space. The effect of such a setting is that during the injection molding process, the screw 7 can be driven to rotate by the transmission action of the motor and the belt to achieve horizontal conveying of the raw materials. Under the action of nitrogen pressure, the air remaining in the injection molding process will be discharged from the injection molding cylinder 1 through the position of the exhaust groove 8 to improve the purity of the internal environment of the injection molding cylinder 1. Moreover, under the action of nitrogen injection, the pressure inside the injection molding cylinder 1 is greater than its external pressure, so that the gas basically only flows from the inside of the injection molding cylinder 1 to the outside, so that the external air will not enter the inside of the injection molding cylinder 1.

[0029] Since the above-mentioned second filling port 5 is fixedly arranged on the injection cylinder 1, the range of nitrogen addition is relatively limited. As another embodiment of the present invention, a movable groove 9 is opened on the injection cylinder 1, and a filter part 10 is arranged between the movable groove 9 and the internal space of the injection cylinder 1. A transmission ring 11 is rotatably arranged on the injection cylinder 1, and the second filling port 5 is arranged on the transmission ring 11; it also includes a power component for driving the transmission ring 11 to rotate. Specifically, the movable groove 9 is opened in the inner wall of the injection cylinder 1 at the bottom, which is approximately fan-shaped. The filter part 10 is preferably an arc-shaped hard mesh structure adapted to the inner wall of the injection cylinder 1. The end of the second filling port 5 is also arc-shaped, which fits the position of the filter part 10. The transmission ring 11 is sleeved on the outside of the injection cylinder 1, which is used to block the movable groove 9. The power component can be a structure such as a motor for providing rotational force, and the connection structure between the second filling port 5 and the air supply component is preferably a hose. A limiting structure is provided between the transmission ring 11 and the injection cylinder 1 to prevent the two from axial movement. The purpose of such a setting is that when nitrogen is added to the inside of the injection cylinder 1, the transmission ring 11 is driven to rotate back and forth by the power component. Since the second filling port 5 is provided on the transmission ring 11, it will drive the second filling port 5 to swing back and forth in the movable groove 9, thereby increasing the filling range of nitrogen and making the nitrogen filling more comprehensive.

[0030] As an alternative to the above-mentioned motor driving the transmission ring 11 to rotate, preferably, the power assembly includes an incomplete gear ring 12 arranged on the transmission ring 11 and a tooth plate 13 meshing with the incomplete gear ring 12, a transmission disk 14 is provided on the screw 7, a drive shaft 15 is provided on the transmission disk 14, a connecting plate 16 is provided on the tooth plate 13, a transmission hole 17 is opened on the connecting plate 16, and the drive shaft 15 is slidably connected to the transmission hole 17. Specifically, the incomplete gear ring 12 is arranged on the outer circumference of the transmission ring 11, the tooth plate 13 is meshed with the incomplete gear ring 12, and the tooth plate 13 is slidably arranged on a sliding seat 18, and under the limiting action of the sliding seat 18, the tooth plate 13 can only move horizontally back and forth, the transmission disk 14 is arranged at the end of the cylindrical section of the screw 7, and the drive shaft 15 is eccentrically arranged on the circular surface of the transmission disk 14, the connecting plate 16 is L-shaped, and its horizontal section is fixed to the side surface of the tooth plate 13, the transmission hole 17 is opened on the vertical section of the connecting plate 16, and is preferably a waist-shaped hole (that is, the middle is rectangular and the two ends are semicircular), and the size of the drive shaft 15 is adapted to the transmission hole 17. The effect of such a setting is that when the screw 7 rotates to convey the raw materials, it will drive the transmission disk 14 to rotate synchronously, thereby driving the drive shaft 15 to rotate eccentrically, such as Figure 10As shown, when the drive shaft 15 rotates from point a to point b, its horizontal component of force drives the connecting plate 16 to move horizontally (in this process, the drive shaft 15 will slide downward along the transmission hole 17 to adapt to the distance it moves in the vertical direction), thereby driving the tooth plate 13 to move rightward. Since the tooth plate 13 is engaged with the incomplete gear ring 12, the incomplete gear ring 12 is driven to rotate counterclockwise to the maximum value. When the drive shaft 15 rotates from point b to point c, it drives the connecting plate 16 to move leftward (in this process, the drive shaft 15 will also slide downward along the transmission hole 17 to adapt to its vertical direction). The gear plate 13 is driven to move horizontally in the opposite direction, thereby driving the incomplete gear ring 12 to rotate clockwise to the middle position. When the drive shaft 15 rotates from point c to point d, the gear plate 13 is driven to slide further to the left, thereby driving the incomplete gear ring 12 to rotate clockwise to the maximum value. When the drive shaft 15 rotates from point c to point a, the gear plate 13 is driven to slide to the right, thereby driving the incomplete gear ring 12 to rotate counterclockwise to reset. This process is repeated to achieve passive reciprocating swing of the incomplete gear ring 12, thereby passively adjusting the filling angle and position of the second filling port 5.

[0031] Since the size of the output end of the second filling port 5 is smaller than that of the filter portion 10, it is easy for small-sized raw materials to pass through the holes of the filter portion 10 and enter the movable groove 9 at the position where the second filling port 5 and the filter portion 10 are not in contact. Furthermore, a blocking portion 19 is provided on the second filling port 5, and an arc-shaped groove 20 adapted to the blocking portion 19 is provided on the side wall of the movable groove 9. The blocking portion 19 is slidably connected to the arc-shaped groove 20. Specifically, the blocking portion 19 is preferably arc-shaped, which is adapted to the filter portion 10. When the transmission ring 11 drives the second filling port 5 to swing, it drives the blocking portion 19 to slide along the arc-shaped groove 20. Therefore, the blocking portion 19 will block the portion of the second filling port 5 that is not in contact with the filter portion 10, thereby minimizing the risk of raw materials passing through the filter portion 10 and entering the movable groove 9.

[0032] Furthermore, a breaking rod 21 is rotatably provided inside the feed hopper 6, a transmission plate 22 is provided on the breaking rod 21, a transmission rod 23 is fixed to the transmission ring 11, and the transmission rod 23 is slidably connected to the transmission plate 22. Specifically, the breaking rod 21 includes a main shaft and a plurality of support rods fixed to the outer peripheral surface of the main shaft, the main shaft is arranged along the radial direction of the feed hopper 6, the support rods are arranged along the radial direction of the main shaft, it is set at the outlet position of the feed hopper 6, and the main shaft passes through the side wall of the feed hopper 6 and extends to the outside, the transmission plate 22 is fixed to one end of the main shaft located outside the feed hopper 6, and a waist-shaped hole is also provided inside it, the transmission rod 23 is fixed to the outer peripheral surface of the transmission ring 11, it is approximately L-shaped, and the short side of the L-shape is preferably a cylindrical rod that is adapted to the width of the waist-shaped hole, and the short side of the transmission rod 23 is slidably connected to the waist-shaped hole, so that The function of the setting is that when the power component drives the transmission ring 11 and the second filling port 5 to swing, the transmission rod 23 will be driven to swing synchronously. Therefore, under the action of the connection between the transmission rod 23 and the transmission plate 22, the transmission plate 22 will be driven to swing back and forth. During the swinging of the transmission plate 22, the short side of the transmission rod 23 will slide along the waist-shaped hole for adaptation, and during the reciprocating swinging of the transmission plate 22, the breaking rod 21 will be driven to rotate forward and reverse, so as to passively break up the raw materials at the outlet of the feed hopper 6 through the support rod, thereby avoiding the accumulation of raw materials at the outlet of the feed hopper 6 as much as possible.

[0033] During the long operation of the injection molding machine, small-sized raw materials are easy to enter the exhaust groove 8. Due to the continuous accumulation of raw materials, the exhaust groove 8 will be blocked, making it impossible for the residual air to be discharged in time. As another embodiment of the present invention, the injection molding cylinder 1 is provided with a dredging component for cleaning the exhaust groove 8. The dredging component includes a movable ring 24 slidably arranged on the injection molding cylinder 1, the exhaust groove 8 is provided on the outer peripheral surface of the movable ring 24, and a wave groove 25 is provided on the movable ring 24. A sliding rod 26 is provided on the outer peripheral surface of the screw 7, and the sliding rod 26 is slidably connected to the wave groove 25; a cleaning portion 27 is provided on the injection molding cylinder 1, and the cleaning portion 27 is located on the movement stroke of the exhaust groove 8. Specifically, a through hole 28 is opened at the end of the injection molding cylinder 1, and the movable ring 24 is slidably set in the through hole 28, and a limiting structure such as a limit bar is set between the two to prevent the two from rotating relative to each other, and an annular receiving groove 29 adapted to the movable ring 24 is provided inside the screw 7. During the horizontal sliding process of the movable ring 24, one end of the movable ring 24 is always located inside the annular receiving groove 29 to block the opening of the annular receiving groove 29. The length of the exhaust groove 8 is greater than the thickness of the side wall of the injection molding cylinder 1, so that one end of the exhaust groove 8 is located inside the injection molding cylinder 1. The exhaust groove 8 in the embodiment is a straight groove, the wave groove 25 is arranged along the inner circumference of the movable ring 24, and the crest and trough of the wave groove 25 are arranged along the axial direction of the movable ring 24. The slide rod 26 is preferably a cylindrical rod, which is fixed to the outer circumference of the screw 7. The cleaning portion 27 is L-shaped, one end of which is fixed to the end face of the injection cylinder 1, and the other end is provided with a wedge-shaped surface, which is arranged corresponding to the position of the exhaust groove 8, and there is a gap between the end and the end face of the injection cylinder 1 for air to pass through. The purpose of such a setting is that when the screw 7 rotates to convey When the raw materials are in the working state, since a limited position structure is provided between the movable ring 24 and the through hole 28, the movable ring 24 will not be driven to rotate during the rotation of the screw 7, which will cause relative sliding between the slide bar 26 and the wave groove 25, with the end of the wave groove 25 close to the injection nozzle 102 being the trough, and vice versa being the peak. When the slide bar 26 is at the peak, the movable ring 24 is located at the end close to the injection nozzle 102. At this time, the exhaust groove 8 opening close to the injection nozzle 102 is located inside the injection cylinder 1, so as to fill the inner and outer air spaces of the injection cylinder 1. When the slide bar 26 slides from the wave crest to the wave trough, the movable ring 24 will slide toward the cleaning portion 27, thereby driving the exhaust groove 8 to slide toward the cleaning portion 27 and slide to the outside of the injection cylinder 1. At this time, the wedge-shaped surface of the cleaning portion 27 will shovel the clogged raw materials inside the exhaust groove 8 to the outside of the exhaust groove 8 to achieve passive dredging of the exhaust groove 8. Conversely, when the slide bar 26 slides from the wave trough to the wave crest, the movable ring 24 will slide toward the injection nozzle 102 for reset.

[0034] As an optional embodiment of the present invention, Figure 9 As shown, there are preferably two crests and two troughs, and the crest has a certain length (such as Figure 9 The right end part), when the slide bar 26 enters the crest, it will slide along the crest for a period of time before sliding toward the trough. Since the exhaust groove 8 connects the inner and outer spaces of the injection cylinder 1 when the slide bar 26 slides at the crest, the exhaust time of the exhaust groove 8 can be increased.

[0035] Preferably, after the device is used, the screw 7 is controlled to rotate to control the horizontal sliding of the movable ring 24 so that the exhaust groove 8 is completely placed inside the through hole 28. At this time, the exhaust groove 8 is blocked and the machine is shut down in this state to prevent outside air from entering the inside of the injection cylinder 1 through the exhaust groove 8.

[0036] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A gas filling mechanism for an injection molding machine, characterized in that: It includes a first filling assembly arranged on the injection molding cylinder; The first filling assembly includes an asbestos mesh cover sleeved on the outside of the injection molding cylinder, and the asbestos mesh cover is provided with a first filling port; It also includes a gas supply component for providing protective gas, and the gas supply component is connected to the first filling port.

2. A gas filling mechanism for an injection molding machine according to claim 1, characterized in that: An annular groove is provided on the outer peripheral surface of the injection cylinder.

3. A gas filling mechanism for an injection molding machine according to claim 1, characterized in that: It also includes a second filling assembly arranged on the injection cylinder, the second filling assembly includes a second filling port arranged on the injection cylinder, the injection cylinder is provided with a feed hopper, and the second filling port is located below the feed hopper.

4. An injection molding machine, characterized in that: The invention comprises the gas filling mechanism for an injection molding machine, a feed hopper and an injection molding cylinder according to any one of claims 1 to 3.

5. The injection molding machine according to claim 4, characterized in that: The injection molding machine also includes a screw that is rotatably arranged inside the injection molding cylinder, and an exhaust groove is opened on the screw.

6. The injection molding machine according to claim 5, characterized in that: The injection molding cylinder is provided with a movable groove, the movable groove is provided with a filter portion, the injection molding cylinder is rotatably provided with a transmission ring, and the second filling port is provided on the transmission ring; It also includes a power assembly for driving the transmission ring to rotate.

7. The injection molding machine according to claim 6, characterized in that: The power assembly includes an incomplete gear ring arranged on the transmission ring and a gear plate meshing with the incomplete gear ring, a transmission disk is provided on the screw, a drive shaft is provided on the transmission disk, a connecting plate is provided on the gear plate, a transmission hole is opened on the connecting plate, and the drive shaft is slidably connected to the transmission hole.

8. The injection molding machine according to claim 6, characterized in that: The second filling port is provided with a blocking portion, and the side wall of the movable groove is provided with an arc groove adapted to the blocking portion, and the blocking portion is slidably connected to the arc groove.

9. The injection molding machine according to claim 6, characterized in that: A breaking rod is rotatably provided inside the feed hopper, a transmission plate is provided on the breaking rod, a transmission rod is fixedly connected to the transmission ring, and the transmission rod is slidably connected to the transmission plate.

10. The injection molding machine according to claim 5, characterized in that: The injection molding cylinder is provided with a dredging component for cleaning the exhaust groove.

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