Injection molding device for plastic parts

Abstract

The invention discloses an injection molding device for plastic parts, and relates to the technical field of injection molding, the injection molding device comprises a rack, and a mold and an injection molding machine are sequentially assembled on the rack; the mold is composed of a movable mold core and a fixed mold core, and a mold cavity is defined by mold cavities of the movable mold core and the fixed mold core after mold closing; the injection molding machine is used for melting plastic particles and then injecting the molten plastic particles into the mold cavity through the fixed mold core under high pressure; a telescopic component connected with the spraying rod is located on the portion, between the movable mold core and the fixed mold core, of the rack, the inner wall of the mold groove is cleaned up through high-pressure airflow firstly so that the release agent sprayed out of the agent spraying holes can be evenly sprayed to the inner wall of the mold groove, and the quality of a plastic part obtained after demolding is guaranteed; the wave groove can push the rod body to continuously reciprocate along the strip-shaped groove, the rod body moves forwards or backwards to push the spraying rod to swing up and down around the second sleeve, the spraying range of airflow and the release agent is expanded, and the spraying rod is used for covering the inner wall of the mold core.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, and in particular to an injection molding device for plastic parts. Background Art

[0002] The injection molding device for plastic parts is a type of injection molding equipment. It is a core equipment used to manufacture plastic products. Its working principle involves heating the plastic raw material to a molten state and injecting it into a closed mold under high pressure. After cooling and solidification, it forms the desired shape. When producing small plastic parts, precise process control and mold design are required to meet the high requirements of miniaturization, precision, appearance and functionality.

[0003] After the mold of the injection molding machine is used for a long time, some plastic will remain on the inside of the mold, so each time it is used, a release agent needs to be sprayed on the inner wall of the separated mold to allow the plastic parts to be quickly separated from the mold after injection molding. In order to increase the spraying range during the spraying process, the existing release agent uses multiple nozzles to spray at the same time, which requires increasing the pump power. At the same time, the release agent needs a period of time to dry after spraying, and a long drying time increases the injection time cost. Summary of the invention

[0004] The object of the present invention is to provide an injection molding device for plastic parts, which has a high-pressure airflow that first cleans the inner wall of the mold groove so that the release agent sprayed from the spray hole can be evenly sprayed on the inner wall of the mold groove, thereby ensuring the quality of the plastic part after demolding; the wave groove can push the rod body to continuously reciprocate along the strip groove, and the rod body moves forward or backward to push the spray rod to swing up and down around the sleeve, thereby expanding the spray range of the airflow and the release agent to cover the inner wall of the mold core, reduce nozzle dependence, reduce energy consumption and shorten drying time, thereby improving the overall production efficiency.

[0005] To achieve the above object, the present invention provides the following technical solution: an injection molding device for plastic parts, comprising:

[0006] A frame, on which the mold and the injection molding machine are sequentially assembled;

[0007] The mold is composed of a movable mold core and a fixed mold core, and the mold grooves of the movable mold core and the fixed mold core form a mold cavity after the mold is closed;

[0008] An injection molding machine, which melts the plastic particles and injects them into the mold cavity through a fixed mold core under high pressure;

[0009] A spray rod, wherein the telescopic component connected to the spray rod is located on the frame between the movable mold core and the fixed mold core, and the telescopic component is used to drive the spray rod to extend between the movable mold core and the fixed mold core when the mold is opened, and the mold release agent is used to expand the area of ​​the mold groove of the movable mold core and the fixed mold core through the reciprocating swing of the spray rod;

[0010] The telescopic component includes a sleeve 1 fixed on the frame, the sleeve 1 is engaged with a sliding sleeve 2, the spray rod is connected to the sleeve 2, the sleeve 2 is threadedly connected to the rotating rod, and the rotating rod rotates forward and reversely to drive the sleeve 2 and the spray rod to reciprocate and telescope along the sleeve 1;

[0011] The air flow channel in the rotating rod is inserted into the air flow pipe of the spray rod, and the swing component connected to the rotating rod port is connected to the spray rod.

[0012] Furthermore, the port of the second sleeve is provided with an annular groove for the insertion of the first sleeve, and a sliding groove provided along the length direction of the annular groove is inserted into the sliding block of the first sleeve, so that the second sleeve can slide along the first sleeve.

[0013] Furthermore, an internal thread is provided on the inner wall of the second sleeve, and an external thread provided on the outer wall of the rotating rod is meshed with the internal thread;

[0014] A limiting ring 1 is also mounted on the outer wall of the sleeve 2, and a limiting ring 2 for inserting the sleeve 2 is installed on the frame. A plurality of springs are mounted on the side of the limiting ring 2 facing the limiting ring 1 to provide rebound elastic force for the limiting ring 1.

[0015] Furthermore, a joint is sleeved on the port of the rotating rod located outside the second sleeve, and the rotating rod is connected to the reducer through a belt, and the joint and the reducer are assembled on the bracket of the frame;

[0016] The joint has an internal fixed spacer ring, which is sealed and connected to the rotating rod. The spacer ring separates the joint and the rotating rod to form an annular cavity into chamber one and chamber two. The air pipe and agent pipe connected to both sides of the joint are connected to chamber one and chamber two respectively.

[0017] The air flow channel consists of a coaxial outer channel and an inner channel, the outer channel is communicated with the first chamber, and the second chamber is communicated with the inner channel.

[0018] Furthermore, the air flow pipe includes an air pipe connected to a high-pressure air pump, and the agent pipe is connected to a release agent tank body through a pump body.

[0019] Furthermore, the airflow tube includes an inner tube and an outer tube, the inner tube is inserted into the inner channel and sealed, and the outer tube is inserted into the outer channel and sealed.

[0020] Furthermore, air holes and spray holes are arranged on both symmetrical sides of the spray rod, the air holes are connected to the outer tube, and the spray holes are connected to the inner tube.

[0021] Furthermore, the swing component is placed in the inner cavity between the outer tube and the second sleeve, and the swing component includes a guide rod inserted into the port of the rotating rod, the port of the guide rod is connected to the swivel, a circle of wave grooves is provided on the outer wall of the swivel, and a strip groove is provided on the inner wall of the second sleeve. The two ends of the rod body are inserted between the strip groove and the wave groove, and the connecting rod 1 hinged on the rod body is connected to the connecting rod 2 through a ball hinge, and the connecting rod 2 is also connected to the spray rod through a ball hinge.

[0022] Furthermore, a ring cylinder for connecting rod one to pass through is fixed on the sleeve two, and the swivel rotates synchronously with the swivel rod through the guide rod. The rod body moves back and forth along the strip groove under the push of the wave groove, and the spray rod is pushed to swing around the sleeve two under the drive of connecting rods one and two.

[0023] Technical effects and advantages of the present invention:

[0024] 1. The air holes and the spray holes are arranged alternately in proportion. The air holes are first used to clean the residual materials on the mold grooves of the movable mold core and the fixed mold core, so that the inner wall of the mold groove is clean so that the release agent sprayed from the spray holes can be evenly sprayed on the inner wall of the mold groove, allowing the release agent to fully penetrate and combine with the mold surface to prevent adhesion. Then the air holes can spray hot air to accelerate the drying of the release agent to ensure the quality of the plastic parts after demolding;

[0025] 2. The air hole of the spray rod has moved to the middle position between the fixed mold core and the fixed mold core. The rotating rod is always rotating, and the spray rod remains in place. The wave groove can push the rod body to move back and forth continuously along the strip groove. The rod body moves forward or backward and pushes the spray rod to swing up and down around the sleeve. The air flow and the spray range of the release agent are expanded, the number of nozzles is reduced, and there is no requirement for the pump power. It is used to cover the inner wall of the mold core and optimize the spraying process. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the left side structural diagram of the injection molding device of the present invention;

[0027] Figure 2 It is the right side structural diagram of the injection molding device of the present invention;

[0028] Figure 3 It is a structural diagram of the telescopic component, the spray rod structure and the joint of the present invention;

[0029] Figure 4 It is a cross-sectional state diagram of the telescopic component, the spray rod structure and the joint of the present invention;

[0030] Figure 5 It is a partial cross-sectional view of the telescopic component, the spray bar structure and the joint of the present invention;

[0031] Figure 6 This is a structural diagram of Embodiment 2 of the present invention;

[0032] Figure 7 It is a cross-sectional view of the telescopic component, the spray rod structure and the joint of the second embodiment of the present invention;

[0033] Figure 8 For the present invention Figure 7 A magnified image of point A;

[0034] Fig. 9 It is a diagram showing the swinging state of the swinging component of the present invention.

[0035] In the figure:

[0036] 1. Frame; 11. Limiting ring 2; 2. Mold; 3. Injection molding machine; 4. Spray rod; 41. Air flow tube; 411. Inner tube; 412. Outer tube; 5. Telescopic component; 51. Sleeve 1; 52. Sleeve 2; 521. Limiting ring 1; 522. Strip groove; 523. Ring tube; 53. Rotating rod; 6. Joint; 61. Spacer ring; 62. Agent tube; 63. Air pipe; 7. Swinging component; 71. Guide rod; 72. Rotating ring; 73. Wave groove; 74. Rod body; 75. Connecting rod 1; 76. Connecting rod 2. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Example 1: Reference Figure 1-Figure 5 , which is a first embodiment of the present invention, provides an injection molding device for a plastic part, comprising:

[0039] A frame 1, on which a mold 2 and an injection molding machine 3 are sequentially assembled;

[0040] Mold 2, which is composed of a movable mold core and a fixed mold core, and the mold grooves of the movable mold core and the fixed mold core form a mold cavity after the mold is closed;

[0041] The cavity surfaces of the movable mold core and the fixed mold core are treated with nano-coating to enhance demoulding properties. The movable mold core is controlled by a hydraulic cylinder on the frame 1, and the mold closing / opening is achieved through the hydraulic cylinder drive. The fixed mold core is connected to the nozzle of the injection molding machine 3 to ensure efficient injection of molten plastic.

[0042] Injection molding machine 3, after melting the plastic particles, the injection molding machine 3 injects them into the mold cavity through the fixed mold core under high pressure. The injection molding machine 3 has a built-in screw melting system, and the melting pressure can reach more than 150MPa. The front end of the nozzle is connected to the mold cavity through the fan-shaped flow channel in the fixed mold core, so that the molten plastic can quickly fill the mold cavity and reduce the generation of cold materials;

[0043] The spray rod 4 and the telescopic component 5 connected to the spray rod 4 are located on the frame 1 between the movable mold core and the fixed mold core. Air holes and spray holes are arranged on both symmetrical sides of the spray rod 4.

[0044] The telescopic component 5 is used to drive the spray rod 4 to extend between the movable mold core and the fixed mold core when the mold is opened. The mold release agent is used to expand the area of ​​the mold groove of the movable mold core and the fixed mold core by reciprocating the spray rod 4. The spray rod 4 is made of corrosion-resistant stainless steel, and multiple groups of air holes (diameter 0.5mm) and spray holes (diameter 0.3mm) are symmetrically distributed at both ends. The air holes and the spray holes are arranged alternately in proportion. The air holes are first used to clean the residual materials on the mold grooves of the movable mold core and the fixed mold core, so that the inner wall of the mold groove is clean so that the mold release agent sprayed from the spray hole can be evenly sprayed on the inner wall of the mold groove, so that the mold release agent can fully penetrate and combine with the surface of the mold 2 to prevent adhesion. Then the air holes can spray hot air to accelerate the drying of the mold release agent to ensure the quality of the plastic parts after demolding;

[0045] The telescopic component 5 includes a sleeve 1 51 fixedly assembled on the frame 1, the sleeve 1 51 is engaged with a sliding sleeve 2 52, the end of the sleeve 2 52 is provided with an annular groove for the insertion of the sleeve 1 51, the sliding groove provided along the length direction of the annular groove is inserted into the slider of the sleeve 1 51, and the sleeve 2 52 is threadedly connected with the rotating rod 53, and the rotating rod 53 rotates forward and reversely to drive the sleeve 2 52 and the spray rod 4 to reciprocate and telescope along the sleeve 1 51, and the spray rod 4 is fixed to the sleeve 2 52;

[0046] An internal thread is arranged on the inner wall of sleeve 2 52, and the external thread arranged on the outer wall of rotating rod 53 meshes with the internal thread. The position of sleeve 1 51 remains fixed, sleeve 1 51 is inserted into sleeve 2 52, and the slide groove of sleeve 1 51 is used to limit the sliding position of the slider. Rotating rod 53 is connected to the reducer on frame 1, and the reducer drives rotating rod 53 to rotate. During the rotation of rotating rod 53, the thread on rotating rod 53 pushes sleeve 2 52 to move toward the movable mold core and the fixed mold core when rotating. During the movement, sleeve 2 52 synchronously pushes spray rod 4 to move.

[0047] The air flow channel in the rotating rod 53 is inserted into the air flow pipe 41 of the spray rod 4. The air flow injected into the rotating rod 53 flows into the spray rod 4 through the air flow pipe 41 and then sprays out from the air hole and the spray hole.

[0048] A connector 6 is sleeved on the end of the rotating rod 53 located outside the sleeve 2 52, and the rotating rod 53 is connected to the reducer through a belt. The connector 6 and the reducer are assembled on the bracket of the frame 1, and the position of the connector 6 remains fixed;

[0049] The spacer ring 61 is fixed inside the joint 6, and the spacer ring 61 is sealed and connected to the rotating rod 53. The spacer ring 61 separates the joint 6 and the rotating rod 53 to form an annular cavity into chamber 1 and chamber 2. The air pipe 63 and the agent pipe 62 connected to the two sides of the joint 6 are respectively connected to the chamber 1 and chamber 2. The chamber 1 and chamber 2 are respectively used for different media to flow in, and the two media will not be mixed after being separated by the spacer ring 61;

[0050] The airflow channel is composed of a coaxial outer channel and an inner channel. The outer channel is connected to chamber 1, and chamber 2 is connected to the inner channel. The coaxial arrangement aims to ensure that the airflow tube 41 does not rotate when the rotating rod 53 rotates.

[0051] The rotating rod 53 can rotate around the joint 6 and the spacer ring 61. During the rotation of the rotating rod 53, the positions and volumes of the chamber 1 and the chamber 2 remain unchanged.

[0052] The air flow tube 41 includes an inner tube 411 and an outer tube 412 . The inner tube 411 is inserted into the inner channel and sealed, and the outer tube 412 is inserted into the outer channel and sealed. The air hole is communicated with the outer tube 412 , and the spray hole is communicated with the inner tube 411 .

[0053] The air flow pipe 41 includes an air pipe 63 connected to a high-pressure air pump, and an agent pipe 62 is connected to a release agent tank through a pump body.

[0054] Airflow working process:

[0055] The airflow generated by the high-pressure air pump flows into chamber one through the air pipe 63. Since chamber one is connected to the external channel, the airflow flows out from chamber one and the connected outer tube 412 and then sprays out from the air holes to clean the inner wall of the mold cavity and accelerate the drying of the release agent.

[0056] Release agent flow working process:

[0057] The pressure generated by the pump body draws the release agent through the agent tube 62 and sends it into the second chamber. The second chamber is connected to the inner channel. The release agent flows out from the inner channel and the connected inner tube 411 and then sprays out through the spray hole to spray the release agent onto the inner wall of the mold cavity.

[0058] Working principle:

[0059] After the movable mold core and the fixed mold core are opened and the plastic parts are taken away, the reducer is started to drive the rotating rod 53 to rotate, thereby pushing the spray rod 4 to slowly move to the middle position between the movable mold core and the fixed mold core, and the air flow ejected by the high-pressure air pump is ejected from both sides of the spray rod 4 to clean the inner walls of the mold cavities of the movable mold core and the fixed mold core. Then the pump body extracts the release agent and ejects it from both sides of the spray rod 4. The release agent is sprayed on the inner wall surface of the mold cavity, and then the working power of the high-pressure air pump is lowered, and the air pipe 63 is heated to increase the air flow temperature. The ejected high-temperature gas allows the release agent to dry quickly to shorten the process time.

[0060] Example 2: Reference Figure 6-Figure 9 , which is the second embodiment of the present invention, the spray rod 4 of this embodiment is rotatably connected to the second sleeve 52, and the spray rod 4 can rotate in the second sleeve 52, but the position of the spray rod 4 will not change during the rotation;

[0061] The swing component 7 connected to the end of the rotating rod 53 is connected to the spray rod 4. A limit ring 521 is also installed on the outer wall of the sleeve 52. A limit ring 11 for inserting the sleeve 52 is installed on the frame 1. A plurality of springs are installed on the side of the limit ring 11 facing the limit ring 521 to provide rebound elastic force for the limit ring 521.

[0062] When the rotating rod 53 rotates, it not only provides the spray rod 4 with the power for reciprocating movement, but also can transmit the power to the spray rod 4 through the swing component 7, so that the spray rod 4 can continuously rotate and swing, so as to expand the cleaning airflow and the spraying range of the release agent. In order to allow the spray rod 4 to always maintain the swinging state for a period of time when moving to the spraying position, this is achieved by adding structures such as the limit ring 1 521, the limit ring 2 11 and the spring.

[0063] Here’s how it works:

[0064] When the rotating rod 53 rotates in one direction, the sleeve 2 52 and the limit ring 1 521 move toward the mold 2 under the action of the thread. After moving to a certain distance, the limit ring 1 521 contacts one side of the spring and slowly squeezes the spring. After the spring is squeezed to one-third of its original position, the threads between the sleeve 2 52 and the rotating rod 53 are staggered. At this time, the thread engagement state between the two is cancelled, and the rotation direction of the rotating rod 53 is the same as the thread direction of the sleeve 2 52. The rotating rod 53 always keeps rotating, and the sleeve 2 52 will not continue to move. At this time, the air hole of the spray rod 4 has moved to the middle position between the fixed mold core and the fixed mold core, so that the rotating rod 53 always rotates while the spray rod 4 does not move.

[0065] When the spray rod 4 needs to be retracted, the rotating rod 53 is rotated in the opposite direction. Under the action of the spring, a thrust is applied to the sleeve 2 52. The rotation direction of the rotating rod 53 is opposite to the thread direction of the sleeve 2 52. The threads of the sleeve 2 52 and the rotating rod 53 can engage. At this time, the rotating rod 53 rotates to retract the sleeve 2 52 into the sleeve 1 51, which will not affect the clamping of the fixed mold core and the movable mold core.

[0066] The swing component 7 is placed in the inner cavity between the outer tube 412 and the sleeve 52. The swing component 7 includes a guide rod 71 inserted into the port of the rotating rod 53. The port of the guide rod 71 is connected to the swivel 72. A circle of wave grooves 73 is arranged on the outer wall of the swivel 72. The outer wall of the swivel 72 is also connected to the ring body fixed on the sleeve 52 through a bearing. The sleeve 52 and the swivel 72 move synchronously, but the swivel 72 can rotate in the sleeve 52. A strip groove 522 is arranged on the inner wall of the sleeve 52. The two ends of the rod body 74 are inserted between the strip groove 522 and the wave groove 73. The connecting rod 1 75 hinged on the rod body 74 is connected through a ball hinge connecting rod 2 76. The connecting rod 2 76 is also connected to the spray rod 4 through a ball hinge.

[0067] A ring cylinder 523 for connecting rod 1 75 to pass through is fixed on sleeve 2 52. The swivel 72 rotates synchronously with the swivel rod 53 through the guide rod 71. The rod body 74 reciprocates along the strip groove 522 under the push of the wave groove 73, and pushes the spray rod 4 to swing around sleeve 2 52 under the drive of connecting rod 1 75 and connecting rod 2 76.

[0068] Specifically, the sleeve 52 will drive the ring 523 to move synchronously during the movement, and the rotating rod 53 will drive the guide rod 71 and the rotating ring 72 to rotate synchronously during the rotation. During the reciprocating movement of the sleeve 52, the rotating ring 72 also moves synchronously.

[0069] At the same time, when the spray rod 4 and the swivel ring 72 rotate synchronously, the wave groove 73 can push the rod body 74 to move back and forth continuously along the strip groove 522. When the rod body 74 moves forward, it will push the connecting rod 1 75 to move along the ring tube 523. The connecting rod 1 75 pushes the connecting rod 2 76 and the spray rod 4 to rotate around the sleeve 2 52 for a certain angle. The rod body 74 moves backward and pushes the spray rod 4 to rotate in the opposite direction around the sleeve 2 52 for a certain angle, thereby realizing the reciprocating swing of the spray rod 4. Through the swing of the spray rod 4, the airflow and the spray range of the release agent are expanded to cover the inner wall of the mold core.

[0070] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A plastic part injection molding device, characterized in that: include: A frame (1), on which a mold (2) and an injection molding machine (3) are sequentially mounted; A mold (2), wherein the mold (2) is composed of a movable mold core and a fixed mold core, and the mold grooves of the movable mold core and the fixed mold core form a mold cavity after the molds are closed; An injection molding machine (3), wherein the injection molding machine (3) melts the plastic particles and injects them into the mold cavity through a fixed mold core under high pressure; A spray rod (4), wherein the telescopic component (5) connected to the spray rod (4) is located on the frame (1) between the movable mold core and the fixed mold core, and the telescopic component (5) is used to drive the spray rod (4) to extend between the movable mold core and the fixed mold core when the mold is opened, and the mold release agent is reciprocated by the spray rod (4) to expand the area of ​​the mold grooves of the movable mold core and the fixed mold core; The telescopic component (5) comprises a sleeve 1 (51) fixedly mounted on the frame (1), the sleeve 1 (51) being engaged with a sliding sleeve 2 (52), the spray rod (4) being connected to the sleeve 2 (52), the sleeve 2 (52) being threadedly connected to a rotating rod (53), and the rotating rod (53) being used to drive the sleeve 2 (52) and the spray rod (4) to reciprocate and telescope along the sleeve 1 (51) by forward and reverse rotation; The air flow channel in the rotating rod (53) is inserted into the air flow pipe (41) of the spray rod (4), and the swing component (7) connected to the end of the rotating rod (53) is connected to the spray rod (4).

2. The plastic part injection molding device according to claim 1, characterized in that: The end of the sleeve 2 (52) is provided with an annular groove for the sleeve 1 (51) to be inserted, and a sliding groove provided along the length direction of the annular groove is inserted into the sliding block of the sleeve 1 (51) so as to enable the sleeve 2 (52) to slide along the sleeve 1 (51).

3. The plastic part injection molding device according to claim 1, characterized in that: An internal thread is arranged on the inner wall of the second sleeve (52), and an external thread arranged on the outer wall of the rotating rod (53) meshes with the internal thread; A limiting ring 1 (521) is also mounted on the outer wall of the second sleeve (52), and a limiting ring 2 (11) for inserting the second sleeve (52) is mounted on the frame (1). A plurality of springs are mounted on the side of the second limiting ring (11) facing the limiting ring 1 (521) to provide a rebound elastic force for the limiting ring 1 (521).

4. The plastic part injection molding device according to claim 1, characterized in that: The rotating rod (53) is sleeved with a joint (6) on the port outside the second sleeve (52), and the rotating rod (53) is connected to the reducer through a belt, and the joint (6) and the reducer are assembled on the bracket of the frame (1); The connector (6) has an internal fixed spacer ring (61), the spacer ring (61) is sealed and connected to the rotating rod (53), the spacer ring (61) separates the connector (6) and the rotating rod (53) to form an annular cavity into chamber one and chamber two, and the air pipe (63) and the agent pipe (62) connected to both sides of the connector (6) are respectively connected to chamber one and chamber two; The air flow channel consists of a coaxial outer channel and an inner channel, the outer channel is communicated with the first chamber, and the second chamber is communicated with the inner channel.

5. The plastic part injection molding device according to claim 4, characterized in that: The air flow pipe (41) includes an air pipe (63) connected to a high-pressure air pump, and an agent pipe (62) connected to a mold release agent tank body through a pump body.

6. The plastic part injection molding device according to claim 1, characterized in that: The airflow tube (41) comprises an inner tube (411) and an outer tube (412); the inner tube (411) is inserted into the inner channel and sealed, and the outer tube (412) is inserted into the outer channel and sealed.

7. The plastic part injection molding device according to claim 6, characterized in that: Air holes and spray holes are arranged on both symmetrical sides of the spray rod (4); the air holes are connected to the outer tube (412), and the spray holes are connected to the inner tube (411).

8. The plastic part injection molding device according to claim 7, characterized in that: The swing component (7) is placed in the inner cavity between the outer tube (412) and the second sleeve (52). The swing component (7) includes a guide rod (71) inserted into the end of the rotating rod (53). The end of the guide rod (71) is connected to the rotating ring (72). A circle of wave grooves (73) is arranged on the outer wall of the rotating ring (72). A strip groove (522) is arranged on the inner wall of the second sleeve (52). The two ends of the rod body (74) are inserted between the strip groove (522) and the wave groove (73). The first connecting rod (75) hinged on the rod body (74) is connected to the second connecting rod (76) through a ball hinge. The second connecting rod (76) is also connected to the spray rod (4) through a ball hinge.

9. The plastic part injection molding device according to claim 8, characterized in that: A ring cylinder (523) through which the first connecting rod (75) passes is fixed on the second sleeve (52); the rotating ring (72) rotates synchronously with the rotating rod (53) through the guide rod (71); the rod body (74) moves back and forth along the strip groove (522) under the push of the wave groove (73); and the spray rod (4) is driven to swing around the second sleeve (52) by the first connecting rod (75) and the second connecting rod (76).

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