Injection molding device

Abstract

The utility model relates to the technical field of injection molding, in particular to an injection molding device which comprises a mold, an injection molding nozzle and a valve needle assembly, a cavity is arranged in the mold, a core is arranged in the cavity, a hot runner is arranged in the injection molding nozzle, the lower end part of the hot runner is an injection molding sprue, the valve needle assembly comprises a valve needle and a power piece, and the valve needle is arranged in the hot runner. A vertically-arranged receding hole or receding groove is formed in the mold core, the receding hole or receding groove is formed under the injection molding sprue, the size of the cross section of the receding hole or receding groove is the same as that of the cross section of the injection molding sprue, and the valve needle comprises a connecting section, an injection molding section and a blocking section which are sequentially connected from top to bottom. The cross section size of the injection molding section is smaller than that of the plugging section; during injection molding, the step between the injection molding section and the plugging section scrapes off the residual sprue trace, so that the possibility that the sprue trace is left on the surface of the medicine feeding pipe is effectively reduced, the injection molding processing quality of the medicine feeding pipe is ensured, and the yield of products is improved.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, and in particular to an injection molding device. Background Technology

[0002] The drug delivery tube is injection molded using an injection molding device. The middle of the drug delivery tube has a hollow structure. Currently, the injection molding device used for the drug delivery tube includes a mold, an injection nozzle, and a valve needle assembly. The mold has a cavity, and a core is set in the cavity. The core forms the hollow structure of the drug delivery tube. The injection nozzle has vertically arranged hot runners, and the lower end of the hot runner is the injection gate. The valve needle assembly includes a vertically arranged valve needle and a power component. The valve needle is set in the hot runner, and the power component is connected to the upper end of the valve needle. The power component can move the valve needle up and down in the hot runner. The valve needle can keep the injection gate in a blocked or open state. When the injection molding machine is not in operation, the valve needle is positioned within the injection gate to seal it, preventing molten adhesive from entering the mold cavity. During injection, the control unit moves the valve needle upwards, positioning it inside the hot runner. This removes the seal, allowing molten adhesive to flow through the hot runner and injection gate into the mold cavity to form the delivery tube. Once the delivery tube is fully formed, the control unit moves the valve needle downwards to seal the injection gate, preventing further molten adhesive from entering the mold cavity. Therefore, this direct entry of molten adhesive from the injection gate into the mold cavity easily leaves gate marks on the surface of the formed delivery tube, affecting the injection molding quality and reducing the product yield. Utility Model Content

[0003] The technical problem solved by this utility model is to provide an injection molding device that can improve the product yield.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: an injection molding device, including a mold, an injection nozzle and a valve needle assembly. The mold has a cavity and a core. The injection nozzle has a vertically arranged hot runner, the lower end of which is the injection gate. The valve needle assembly includes a vertically arranged valve needle and a power component. The valve needle is located in the hot runner, and the power component is connected to the upper end of the valve needle. The power component can move the valve needle up and down in the hot runner. The valve needle can keep the injection gate in a blocked or open state. The core has a vertically arranged clearance hole or clearance groove, which is located directly below the injection gate. The cross-sectional dimensions of the clearance hole or clearance groove are the same as those of the injection gate. The valve needle includes a connecting section, an injection section and a blocking section connected sequentially from top to bottom. The connecting section, injection section and blocking section are coaxially arranged. The cross-sectional dimensions of the injection section are smaller than those of the blocking section.

[0005] When the injection gate is in a blocked state, the blocking section is matched and set in the injection gate. The valve needle moves downward to open the injection gate. When the injection gate is open, the injection section is set in the injection gate. The hot runner is connected to the cavity. The blocking section is matched and set in the relief hole or relief groove.

[0006] Furthermore, both the injection molding section and the sealing section have a circular cross-section.

[0007] Furthermore, the connection between the injection molding section and the sealing section is a rounded transition.

[0008] Furthermore, when the injection gate is in the open state, the sealing section is matched and set in the relief hole or relief groove.

[0009] Furthermore, the valve needle also includes a guide section, which is connected and positioned below the sealing section, and the guide section is matched and positioned in the relief hole or relief groove.

[0010] Furthermore, the power component is a cylinder.

[0011] The beneficial effects of this utility model are as follows: By providing vertically arranged clearance holes or grooves in the core, with the clearance holes or grooves located directly below the injection gate, and the cross-sectional dimensions of the clearance holes or grooves being the same as those of the injection gate, the valve needle includes a connecting section, an injection section, and a sealing section connected sequentially from top to bottom. These sections are coaxially arranged, with the cross-sectional dimension of the injection section being smaller than that of the sealing section. Because the connecting section, injection section, and sealing section are coaxially arranged, and the cross-sectional dimension of the injection section is smaller than that of the sealing section, a step is formed between the injection section and the sealing section. When the injection molding device is not performing injection molding, the injection gate is in a sealed state. The sealing section is matched and positioned within the injection gate to seal it, preventing molten adhesive from entering the mold cavity. During injection molding, the control power unit moves the valve needle downwards, allowing the injection section to move into the injection gate, while the sealing section moves into the clearance hole or clearance groove. Because the cross-sectional dimension of the injection section is smaller than that of the sealing section, the cross-sectional dimension of the injection section is also smaller than that of the injection gate, thus forming a glue inlet channel between the injection section and the injection gate. Molten glue enters the mold cavity through the hot runner and the glue inlet channel between the injection section and the injection gate, forming a delivery tube. After the delivery tube is formed, the control power unit moves the valve needle upwards, causing the sealing section of the valve needle to seal the injection gate, preventing molten glue from entering the mold cavity. As the valve needle moves upwards, the step between the injection section and the sealing section scrapes away any remaining gate marks, effectively reducing the possibility of gate marks remaining on the delivery tube surface, ensuring the injection molding quality of the delivery tube, and improving the product yield. Attached Figure Description

[0012] Figure 1This is a schematic diagram showing the injection gate in the open position;

[0013] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0014] Figure 3 This is a schematic diagram showing the injection gate in a blocked state;

[0015] Figure 4 yes Figure 3 Enlarged view at point B in the middle;

[0016] Figure 5 This is a schematic diagram of the valve needle;

[0017] The components are labeled as follows: mold 1, cavity 11, hot runner 2, core 3, relief hole 31, valve needle 4, connecting section 41, injection section 42, sealing section 43, guide section 44, power component 5, and drug delivery tube 6. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] like Figures 1 to 5 As shown, the injection molding device of this utility model includes a mold 1, an injection nozzle, and a valve needle assembly. The mold 1 has a cavity 11 containing a core 3. The injection nozzle has a vertically arranged hot runner 2, the lower end of which is the injection gate. The valve needle assembly includes a vertically arranged valve needle 4 and a power component 5. The valve needle 4 is disposed in the hot runner 2, and the power component 5 is connected to the upper end of the valve needle 4, enabling the valve needle 4 to move up and down within the hot runner 2. The valve needle 4 allows the injection gate to... In either the blocked or open state, the core 3 is provided with vertically arranged clearance holes 31 or clearance grooves. The clearance holes 31 or clearance grooves are located directly below the injection gate. The cross-sectional dimensions of the clearance holes 31 or clearance grooves are the same as the cross-sectional dimensions of the injection gate. The valve needle 4 includes a connecting section 41, an injection section 42, and a blocking section 43 connected sequentially from top to bottom. The connecting section 41, the injection section 42, and the blocking section 43 are coaxially arranged. The cross-sectional dimension of the injection section 42 is smaller than the cross-sectional dimension of the blocking section 43.

[0020] When the injection gate is in a blocked state, the blocking section 43 is matched and set in the injection gate. The valve needle 4 moves downward to open the injection gate. When the injection gate is in an open state, the injection section 42 is set in the injection gate. The hot runner 2 is connected to the cavity 11. The blocking section 43 is matched and set in the relief hole 31 or relief groove.

[0021] For example Figure 5As shown, because the connecting section 41, injection molding section 42, and sealing section 43 are coaxially arranged, the cross-sectional dimension of the injection molding section 42 is smaller than that of the sealing section 43, forming a step between the injection molding section 42 and the sealing section 43. For example... Figure 3 , Figure 4 As shown, when the injection molding device is not performing injection molding, the injection gate is in a blocked state. The blocking section 43 is matched and set in the injection gate to block the injection gate, preventing molten glue from entering the cavity 11. For example... Figure 1 , Figure 2 As shown, during injection molding, the control power component 5 moves the valve needle 4 downward, causing the injection section 42 to move into the injection gate, and the sealing section 43 to move into the relief hole 31 or relief groove. Because the cross-sectional dimension of the injection section 42 is smaller than that of the sealing section 43, the cross-sectional dimension of the injection section 42 is smaller than that of the injection gate, thus forming a glue inlet channel between the injection section 42 and the injection gate. The molten glue flows through the hot runner 2, the injection section 42, and the injection gate... The glue enters the cavity 11 through the injection channel and is formed into a delivery tube. After the delivery tube is formed, the control power component 5 moves the valve needle 4 upward, so that the sealing section 43 of the valve needle 4 seals the injection gate, preventing molten glue from entering the cavity 11. When the valve needle 4 moves upward, the step between the injection section 42 and the sealing section 43 will scrape off the remaining gate marks, effectively reducing the possibility of leaving gate marks on the surface of the delivery tube, ensuring the injection molding quality of the delivery tube, and improving the product yield.

[0022] Specifically, since the delivery tube has a symmetrical structure, in order to further improve the injection molding quality of the delivery tube, the cross-section of the injection section 42 is circular and the cross-section of the sealing section 43 is circular. This arrangement makes the cross-section of the injection gate also circular, and the valve needle 4 is set on the left and right symmetrical axis of the delivery tube.

[0023] To facilitate the entry of molten adhesive into the cavity 11 through the glue inlet channel between the injection section 42 and the injection gate, the connection between the injection section 42 and the sealing section 43 is a rounded transition.

[0024] To reduce the possibility of molten adhesive entering the relief hole 31 or relief groove, when the injection gate is in the open state, the sealing section 43 is matched and set in the relief hole 31 or relief groove, and the sealing section 43 also blocks the relief hole 31 or relief groove.

[0025] To better enable the valve needle 4 to move up and down in the hot runner 2, the relief hole 31, or the relief groove, for example... Figure 5 As shown, the valve needle 4 also includes a guide section 44, which is connected and disposed below the sealing section 43, and is matched and disposed in the relief hole 31 or the relief groove.

[0026] For ease of automated control, the power component 5 is preferably a cylinder.

Claims

1. An injection molding apparatus, comprising a mold (1), an injection nozzle, and a valve needle assembly, wherein the mold (1) has a cavity (11) and a core (3) is provided in the cavity (11), and the injection nozzle has a vertically arranged hot runner (2), the lower end of which is the injection gate; the valve needle assembly includes a vertically arranged valve needle (4) and a power component (5), the valve needle (4) is disposed in the hot runner (2), the power component (5) is connected to the upper end of the valve needle (4), and the power component (5) enables the valve needle (4) to move up and down in the hot runner (2), and the valve needle (4) enables the injection gate to be in a blocked state or an open state, characterized in that: The core (3) is provided with vertically arranged relief holes (31) or relief grooves. The relief holes (31) or relief grooves are located directly below the injection gate. The cross-sectional dimensions of the relief holes (31) or relief grooves are the same as the cross-sectional dimensions of the injection gate. The valve needle (4) includes a connecting section (41), an injection section (42), and a sealing section (43) connected from top to bottom. The connecting section (41), the injection section (42), and the sealing section (43) are coaxially arranged. The cross-sectional dimensions of the injection section (42) are smaller than the cross-sectional dimensions of the sealing section (43). When the injection gate is in a blocked state, the blocking section (43) is matched and set in the injection gate. The valve needle (4) moves downward to make the injection gate open. When the injection gate is open, the injection section (42) is set in the injection gate. The hot runner (2) is connected to the cavity (11). The blocking section (43) is matched and set in the relief hole (31) or relief groove.

2. The injection molding apparatus as described in claim 1, characterized in that: The cross-section of the injection molding section (42) is circular, and the cross-section of the sealing section (43) is circular.

3. The injection molding apparatus as described in claim 1, characterized in that: The connection between the injection molding section (42) and the sealing section (43) is a circular arc transition connection.

4. The injection molding apparatus as described in claim 1, characterized in that: When the injection gate is in the open state, the sealing section (43) is matched and set in the relief hole (31) or relief groove.

5. The injection molding apparatus as described in claim 1, characterized in that: The valve needle (4) also includes a guide section (44), which is connected and disposed below the sealing section (43), and is matched and disposed in the relief hole (31) or relief groove.

6. The injection molding apparatus according to any one of claims 1 to 5, characterized in that: The power component (5) is a cylinder.

Images