Needle valve type hot runner structure for rapid color changing injection molding

Abstract

The utility model discloses a needle valve type hot runner structure for quick color changing injection molding, which relates to the technical field of needle valve type hot runner structures, and comprises a hot nozzle main body, an injection hole, a guide runner, a cylinder main body and a needle valve main body, the injection hole is formed in the bottom of the hot nozzle main body, and the guide runner is formed in the hot nozzle main body close to the injection hole. An air cylinder main body is arranged above the hot nozzle main body, and the bottom of the air cylinder main body is connected with a needle valve main body. According to the needle valve type hot runner structure for rapid color changing injection molding, when the piston rod contracts, the connecting block can be driven to move in the direction close to the nitrogen spring body, when the connecting block moves, the sealing plate and the inclined block can be driven to move, and the needle valve body in the telescopic state can be buffered through the reset spring; the bottom end of the needle valve body and the inner wall, close to the injection hole, of the hot nozzle body are not prone to damage, and therefore the service life of the needle valve body and the hot nozzle body is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of needle valve type hot runner structures, in particular to a needle valve type hot runner structure for rapid color-changing injection molding. Background Art

[0002] The needle valve hot runner structure plays an important role in the color change injection molding process of plastic products. The hot runner system controls the opening and closing of the injection hole through the mechanical action of the valve needle, thereby achieving precise control of the injection of molten plastic into the mold cavity. The needle valve is mainly driven by a cylinder. The existing needle valve hot runner structure still has certain defects when used.

[0003] In the prior art, the needle valve hot runner structure is an important component in the color change injection molding process of plastic product molds. The needle valve hot runner is a hot runner system that controls the flow of the melt through a needle valve. During the injection molding process, the opening and closing of the needle valve is precisely controlled by the control system to ensure that the melt enters the mold cavity at the right time. When the color of the injection molded product needs to be changed, the traditional replacement method is long and requires shutdown to change the color of the raw material, making it difficult for the needle valve hot runner structure to quickly change color injection, resulting in low color change injection efficiency. Utility Model Content

[0004] The purpose of the present invention is to provide a needle valve hot runner structure for rapid color change injection molding, so as to solve the problem that the needle valve hot runner structure currently on the market is difficult to perform rapid color change injection molding as mentioned in the background art.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: A needle valve type hot runner structure for rapid color change injection molding, comprising: a hot nozzle body, an injection hole, a guide flow channel, a cylinder body and a needle valve body, wherein the bottom of the hot nozzle body is provided with an injection hole, the interior of the hot nozzle body near the injection hole is provided with a guide flow channel, a cylinder body is provided above the hot nozzle body, the bottom of the cylinder body is connected to the needle valve body, a first feed port is provided at the top of the hot nozzle body, a second feed port is provided at the top of the hot nozzle body away from the first feed port, a mounting block is installed inside the hot nozzle body near the first feed port and the second feed port, a nitrogen spring body is installed inside the mounting block, the top of the nitrogen spring body is connected to a nitrogen pipeline, the bottom end of the nitrogen spring body is connected to a piston rod, the bottom end of the piston rod is connected to a connecting block, the bottom of the connecting block is connected to a sealing plate, the sealing plate is connected to an oblique block near the inner wall of the hot nozzle body, and a sealing ring is installed inside the mounting block.

[0006] Preferably, a sliding structure is formed between the connecting block and the mounting block.

[0007] Preferably, the inclined surface of the inclined block matches the inclined surface of the inner wall of the nozzle body.

[0008] Preferably, a first fixing plate is connected to the outer side of the needle valve body close to the cylinder body, and a second fixing plate is connected to the bottom of the cylinder body.

[0009] Preferably, a through hole is formed inside the second fixing plate, and a heat-resistant corrugated hose and a return spring are commonly connected between the first fixing plate and the second fixing plate.

[0010] Preferably, the return spring is located outside the needle valve body.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: in the needle valve type hot runner structure of the rapid color-changing injection molding, when the piston rod contracts, it can drive the connecting block to move in the direction close to the nitrogen spring body. When the connecting block moves, it can drive the sealing plate and the inclined block to move. The needle valve body in the telescopic state can be buffered by the return spring, so that the bottom end of the needle valve body and the inner wall of the hot nozzle body close to the injection hole are not easily damaged, thereby extending the service life of the needle valve body and the hot nozzle body.

[0012] 1. The needle valve hot runner structure is a common injection molding method in injection molds. The efficiency of traditional color change injection molding is low, and it is difficult to quickly change color injection molding. When the piston rod contracts, it can drive the connecting block to move toward the direction close to the nitrogen spring body. When the connecting block moves, it can drive the sealing plate and the inclined block to move. When the sealing plate and the inclined block rise to the maximum position, the first color injected inside the first feed port can enter the guide flow channel. At the same time, the needle valve body is driven to contract by the cylinder body, so that the first color injected in the guide flow channel can be injected into the mold cavity through the injection hole. When the color of the injection molding needs to be changed, When changing colors, the external force in the nitrogen pipeline near the first feed port can be removed. When the piston rod moves, the inner wall of the hot nozzle body can be sealed by the corresponding sealing plate and the bevel block, so that the first color injected inside the first feed port will not enter the guide flow channel. The corresponding sealing plate and the bevel block can open the channel between the second feed port and the guide flow channel. At this time, the second color injected inside the second feed port can flow into the guide flow channel and be injected into the mold from the inside of the injection hole, thereby completing the rapid color change injection molding operation. By controlling the two sets of nitrogen spring bodies, rapid color change injection molding can be achieved, thereby improving the efficiency of color change injection molding.

[0013] 2. During the use of the needle valve type hot runner structure, the bottom end of the needle valve body contacts and collides with the inner wall of the hot nozzle body near the injection hole for a long time. At the same time, the extension and retraction speed of the needle valve body is relatively fast, which makes the bottom end of the needle valve body and the inner wall of the hot nozzle body near the injection hole easily damaged. When the needle valve body is extended, the needle valve body can drive the first fixed plate to move. When the first fixed plate moves, it can stretch the heat-resistant corrugated hose and the return spring. The return spring can play a buffering effect during the stretching process, so that when the bottom end of the needle valve body contacts the inner wall of the hot nozzle body near the injection hole, it is not easy to generate a large force, thereby reducing the collision force between the bottom end of the needle valve body and the inner wall of the hot nozzle body near the injection hole. The return spring can buffer the needle valve body in the extended and retracted state, so that the bottom end of the needle valve body and the inner wall of the hot nozzle body near the injection hole are not easily damaged, thereby extending the service life of the needle valve body and the hot nozzle body. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main cutaway structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the main cutaway structure of the mounting block of the utility model;

[0016] Figure 3 This is a schematic diagram of the main cross-sectional structure of the heat-resistant corrugated hose of the present invention.

[0017] In the figure: 1. Hot nozzle body; 2. Injection hole; 3. Guide flow channel; 4. Cylinder body; 5. Needle valve body; 6. First feed port; 7. Second feed port; 8. Mounting block; 9. Nitrogen spring body; 10. Nitrogen pipeline; 11. Piston rod; 12. Connecting block; 13. Sealing plate; 14. Bevel block; 15. Sealing ring; 16. First fixing plate; 17. Second fixing plate; 18. Through hole; 19. Heat-resistant corrugated hose; 20. Return spring. DETAILED DESCRIPTION

[0018] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0019] See also Figure 1 and Figure 2It can be seen that the utility model provides a technical solution: a needle valve hot runner structure for rapid color change injection molding, comprising: a hot nozzle body 1, an injection hole 2, a guide flow channel 3, a cylinder body 4 and a needle valve body 5, an injection hole 2 is provided at the bottom of the hot nozzle body 1, a guide flow channel 3 is provided inside the hot nozzle body 1 near the injection hole 2, a cylinder body 4 is provided above the hot nozzle body 1, and a needle valve body 5 is connected to the bottom of the cylinder body 4, a first feed port 6 is provided at the top of the hot nozzle body 1, a second feed port 7 is provided at the top of the hot nozzle body 1 away from the first feed port 6, and the hot nozzle body 1 is close to the first feed port 6. The feed port 6 and the second feed port 7 are internally installed with a mounting block 8, and a nitrogen spring body 9 is installed inside the mounting block 8. The top of the nitrogen spring body 9 is connected to a nitrogen pipeline 10, and the bottom end of the nitrogen spring body 9 is connected to a piston rod 11. The bottom end of the piston rod 11 is connected to a connecting block 12. The bottom of the connecting block 12 is connected to a sealing plate 13. The sealing plate 13 is connected to an inclined block 14 near the inner wall of the hot nozzle body 1. A sealing ring 15 is installed inside the mounting block 8. A sliding structure is formed between the connecting block 12 and the mounting block 8. The inclined surface of the inclined block 14 matches the inclined surface of the inner wall of the hot nozzle body 1.

[0020] In specific implementation, the needle valve hot runner structure is a relatively common injection molding method in injection molds. The efficiency of traditional color-changing injection molding is low, and it is difficult to perform color-changing injection molding quickly. When the first color of the injection molding enters the interior of the hot nozzle body 1 through the first feed port 6, an external force is applied to the nitrogen pipeline 10 near the side of the first feed port 6, so that the high-pressure nitrogen inside the nitrogen spring body 9 near the first feed port 6 is compressed. At this time, the piston rod 11 is in a contracted state. When the piston rod 11 contracts, it can drive the connecting block 12 to move toward the direction close to the nitrogen spring body 9. When the connecting block 12 moves, it can drive the sealing plate 13 and the inclined block 14 to move. When the sealing plate 13 and the inclined block 14 rise to the maximum position, the first color of the injection molding inside the first feed port 6 can enter the guide flow channel 3. At the same time, the needle valve body 5 is driven to contract by the cylinder body 4, so that the guide flow channel 3 can be injected into the mold cavity through the injection hole 2, and the sealing ring 15 can prevent the raw material in the guide channel 3 from entering the mounting block 8. When the color of the injection molding needs to be changed, the external force in the nitrogen pipeline 10 near the first feed port 6 can be removed, so that the high-pressure nitrogen inside the nitrogen spring body 9 near the first feed port 6 expands and generates pressure, thereby pushing the corresponding piston rod 11 to move. When the piston rod 11 moves, the inner wall of the hot nozzle body 1 can be blocked by the corresponding sealing plate 13 and the inclined block 14, so that the first color injected inside the first feed port 6 will not enter the guide channel 3. At the same time, external force acts on the nitrogen pipeline 10 near the second feed port 7, so that the high-pressure nitrogen inside the nitrogen spring body 9 near the second feed port 7 is compressed, thereby causing the corresponding piston rod 11 to contract.

[0021] See Figure 1 and Figure 2 It can be seen that the corresponding sealing plate 13 and the inclined block 14 can open the channel between the second feed port 7 and the guide channel 3. At this time, the second color injected inside the second feed port 7 can flow into the guide channel 3 and be injected into the mold from the injection hole 2, thereby completing the rapid color change injection molding operation. By controlling the two groups of nitrogen spring bodies 9, rapid color change injection molding can be achieved, thereby improving the efficiency of color change injection molding.

[0022] See Figure 1 and Figure 3 It can be seen that the needle valve body 5 is connected to the outside of the cylinder body 4 with a first fixed plate 16, and the bottom of the cylinder body 4 is connected to the second fixed plate 17. A through hole 18 is opened inside the second fixed plate 17. A heat-resistant corrugated hose 19 and a return spring 20 are commonly connected between the first fixed plate 16 and the second fixed plate 17. The return spring 20 is located on the outside of the needle valve body 5, and the needle valve body 5 forms a sliding structure with the second fixed plate 17 through the through hole 18.

[0023] In specific implementation, during the use of the needle valve hot runner structure, the needle valve body 5 is controlled by the cylinder body 4 to extend and retract. When the bottom end of the needle valve body 5 is docked with the injection hole 2, the raw material inside the guide channel 3 can be blocked. The bottom end of the needle valve body 5 contacts and collides with the inner wall of the hot nozzle body 1 near the injection hole 2 for a long time. At the same time, the extension and retraction speed of the needle valve body 5 is relatively fast, which makes the bottom end of the needle valve body 5 and the inner wall of the hot nozzle body 1 near the injection hole 2 easily damaged. A heat-resistant corrugated hose 19 and a return spring 20 can be installed between the needle valve body 5 and the cylinder body 4. When the needle valve body 5 is extended, the needle valve body 5 can drive the first fixed plate 16 to move. At the same time, the needle valve body 5 can slide with the second fixed plate 17 through the through hole 18. When the first fixed plate 16 moves, the heat-resistant corrugated hose 19 and the return spring 20 can be stretched. The return spring 20 can play a buffering role during the stretching process, so that when the bottom end of the needle valve body 5 contacts the inner wall of the hot nozzle body 1 close to the injection hole 2, it is not easy to generate a large force, thereby reducing the collision force between the bottom end of the needle valve body 5 and the inner wall of the hot nozzle body 1 close to the injection hole 2.

[0024] See Figure 1 and Figure 3 It can be seen that the return spring 20 can buffer the needle valve body 5 in the telescopic state, so that the bottom end of the needle valve body 5 and the inner wall of the hot nozzle body 1 close to the injection hole 2 are not easily damaged, thereby extending the service life of the needle valve body 5 and the hot nozzle body 1.

[0025] In summary, when using the needle valve hot runner structure for rapid color change injection molding, when the first color of the injection molding enters the interior of the hot nozzle body 1 through the first feed port 6, an external force is applied to the nitrogen pipeline 10 near the side of the first feed port 6, so that the high-pressure nitrogen inside the nitrogen spring body 9 near the first feed port 6 is compressed, and the corresponding sealing plate 13 and the inclined block 14 can open the channel between the second feed port 7 and the guide flow channel 3. At this time, the second color of the injection molding inside the second feed port 7 can flow into the guide flow channel 3 and be injected into the mold from the inside of the injection hole 2, thereby completing the rapid color change injection molding operation. By controlling the two groups of nitrogen spring bodies 9, Fast color-changing injection molding, thereby improving the color-changing injection molding efficiency, the return spring 20 can play a buffering effect during the stretching process, so that when the bottom end of the needle valve body 5 contacts the inner wall of the hot nozzle body 1 close to the injection hole 2, it is not easy to generate a large force, thereby reducing the collision force between the bottom end of the needle valve body 5 and the inner wall of the hot nozzle body 1 close to the injection hole 2. The return spring 20 can buffer the needle valve body 5 in the telescopic state, so that the bottom end of the needle valve body 5 and the inner wall of the hot nozzle body 1 close to the injection hole 2 are not easily damaged, thereby extending the service life of the needle valve body 5 and the hot nozzle body 1. The content not described in detail in this description belongs to the existing technology known to professional and technical personnel in this field.

[0026] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or 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 scope of protection of the present invention.

Claims

1. A needle valve hot runner structure for rapid color change injection molding, comprising: The hot nozzle body (1), the injection hole (2), the guide flow channel (3), the cylinder body (4) and the needle valve body (5) are characterized by: An injection hole (2) is provided at the bottom of the hot nozzle body (1), a guide flow channel (3) is provided inside the hot nozzle body (1) near the injection hole (2), a cylinder body (4) is provided above the hot nozzle body (1), and a needle valve body (5) is connected to the bottom of the cylinder body (4); A first feed port (6) is provided at the top of the hot nozzle body (1); a second feed port (7) is provided at the top of the hot nozzle body (1) away from the first feed port (6); a mounting block (8) is installed inside the hot nozzle body (1) near the first feed port (6) and the second feed port (7); a nitrogen spring body (9) is installed inside the mounting block (8); a nitrogen pipeline (10) is connected to the top of the nitrogen spring body (9); a piston rod (11) is connected to the bottom end of the piston rod (11); a connecting block (12) is connected to the bottom of the connecting block (12); a sealing plate (13) is connected to the sealing plate (13) near the inner wall of the hot nozzle body (1); and a sealing ring (15) is installed inside the mounting block (8).

2. The needle valve hot runner structure for rapid color change injection molding according to claim 1, characterized in that: A sliding structure is formed between the connecting block (12) and the mounting block (8).

3. The needle valve hot runner structure for rapid color change injection molding according to claim 1, characterized in that: The inclined surface of the inclined block (14) matches the inclined surface of the inner wall of the hot nozzle body (1).

4. The needle valve hot runner structure for rapid color change injection molding according to claim 1, characterized in that: The outer side of the needle valve body (5) close to the cylinder body (4) is connected to a first fixing plate (16), and the bottom of the cylinder body (4) is connected to a second fixing plate (17).

5. The needle valve hot runner structure for rapid color change injection molding according to claim 4, characterized in that: A through hole (18) is provided inside the second fixing plate (17), and a heat-resistant corrugated hose (19) and a return spring (20) are connected between the first fixing plate (16) and the second fixing plate (17).

6. The needle valve hot runner structure for rapid color change injection molding according to claim 5, characterized in that: The return spring (20) is located outside the needle valve body (5).

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