One-driving-two needle valve hot nozzle

Abstract

The utility model discloses a one-driving-two needle valve hot nozzle and belongs to the technical field of needle valve hot nozzles. Comprising an assembling plate, a hot nozzle body is detachably installed below the assembling plate, a pair of guiding heads are installed at the lower end of the hot nozzle body at intervals, a pair of flowing channels are formed in the positions, corresponding to the guiding heads, of the hot nozzle body in the height direction in a penetrating mode, and the two guiding heads communicate with the corresponding flowing channels correspondingly; a valve needle body is arranged in each flow channel in an up-down sliding mode, the valve needle bodies are matched with the corresponding guide heads to form discharging ports, a protective sleeve is installed on the outer side wall of the hot nozzle body, and a heating assembly is wound around the protective sleeve. The die has the advantages that the arrangement distance between products is reduced, the die size is smaller under the condition of the same hole number, and the production cost is reduced; the structure that one heating system controls the two hot nozzles is adopted, the heating power of the whole hot runner system is reduced, the energy-saving effect is achieved, and the production cost is further reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of needle valve hot nozzles, and particularly relates to a one - to - two needle valve hot nozzle. Background Technique

[0002] The use of a hot runner system in an injection mold is the development direction of the industry. Compared with a mold with a cold runner structure, a mold using a hot runner has many advantages such as saving raw materials, improving production efficiency, improving product quality, and simplifying subsequent processing of products. Its disadvantages are increasing the mold cost and improving the machining accuracy of the mold. The needle valve hot nozzle is a relatively complex system in the hot runner system. Its working principle is to drive the up - and - down movement of the central valve needle of the hot nozzle through a cylinder (oil cylinder), and the drive signal (usually through a solenoid valve) is connected to the injection control signal of the injection molding machine, so that the valve needle retracts at the beginning of injection, opens the injection port, allows the molten plastic to pass through, and at the end of injection, the valve needle moves forward to close the mold cavity to achieve the purpose of cutting off the gate. In a traditional two - needle valve hot nozzle, during the injection process, according to the set process parameters, the two needle valves can be opened and closed separately or simultaneously. When the needle valve is opened, the plastic melt flows out from the hot nozzle runner and is injected into the mold cavity; when the needle valve is closed, it prevents the melt from flowing continuously and prevents drooling and gate residue.

[0003] The traditional double - needle valve hot nozzle mainly adopts Figure 3 the structure shown, and the disadvantages of the double - needle valve hot nozzle in use are as follows:

[0004] 1. The structures of the two needle valve hot nozzles are relatively independent. Due to the volume limitation of their own structures, the distance between the two needle valve hot nozzles is relatively large, usually more than 60 mm. In the case of the same number of cavities, the mold size is also large, resulting in it can only be produced on a large - sized injection molding machine, thus increasing the production cost;

[0005] 2. The heating systems on the two needle valve hot nozzles are relatively independent. Each heating system needs to use a power of more than 450 w for heating. When using two hot nozzles simultaneously, two heating systems need to run simultaneously, and the energy consumption is very large, while also increasing the production cost.

[0006] In view of the above - mentioned existing technology, it is necessary to improve the structure of the needle valve hot nozzle. For this reason, the applicant has made a beneficial design, and the technical solution to be introduced below is generated under this background. Content of the Utility Model

[0007] The purpose of the utility model is to provide a one - to - two needle valve hot nozzle, which helps to improve the hot nozzle structure to reduce the distance between the two hot nozzles and make the two hot nozzles share a set of heating system, which is beneficial for the needle valve hot nozzle to be applicable to small - sized molds and save energy.

[0008] The purpose of the utility model is achieved in this way. A one-to-two needle valve hot nozzle comprises: an assembly plate, a hot nozzle body is detachably mounted at the bottom of the assembly plate, a pair of guide heads are installed at intervals at the lower end of the hot nozzle body, a pair of flow channels are opened through the hot nozzle body along the height direction at the positions corresponding to the guide heads, the two guide heads are respectively connected to the corresponding flow channels, a valve needle body is respectively provided in the flow channel for sliding up and down, the valve needle body cooperates with the corresponding guide head to form a discharge port, a protective sleeve is installed on the outer wall of the hot nozzle body, and a heating component is coiled on the protective sleeve.

[0009] In a specific embodiment of the present invention, a connecting frame is fixedly mounted on the upper end of the assembly plate, and a cylinder is fixedly mounted on the upper end of the connecting frame.

[0010] In another specific embodiment of the present invention, the heating power of the heating component is 500W-800W.

[0011] In another specific embodiment of the utility model, a glue injection pipe is provided in the middle of the hot nozzle body, and the lower end of the glue injection pipe is forked to form a pair of glue inlet pipes.

[0012] In another specific embodiment of the present invention, a valve needle sleeve is respectively sleeved between the valve needle body and the assembly plate, the upper end of the valve needle body is respectively fixed to the telescopic end of the cylinder after passing through the assembly plate and the connecting frame, and the lower end of the valve needle body is respectively matched with the guide head after passing through the flow channel.

[0013] In another specific embodiment of the present invention, the heating component is a heating tube and is coiled and embedded on the outer side wall of the protective sleeve.

[0014] In a further specific embodiment of the present invention, one end of the two glue inlet pipes is connected to the glue injection pipe, and the other ends thereof penetrate into corresponding flow channels respectively.

[0015] In a further specific embodiment of the present invention, the distance between the two valve needle bodies is 20-28 cm.

[0016] After adopting the above technical scheme, the utility model has the following beneficial effects compared with the prior art: first, it can reduce the distance between the glue feeding points, thereby reducing the arrangement distance between products. Under the condition of the same number of cavities, the mold size is smaller, and a smaller injection molding machine can be selected for production, thereby reducing production costs; secondly, a set of heating systems is used to control the structure of two hot nozzles, and the heating power of the entire hot runner system is reduced, achieving energy-saving effects and further reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic structural diagram of the present utility model;

[0018] Figure 2 is Figure 1 schematic diagram of the bottom structure of;

[0019] Figure 3 Schematic structural diagram of a traditional double needle valve hot nozzle.

[0020] In the figure: 1. Assembly plate; 2. Connection frame; 3. Cylinder; 4. Hot nozzle body; 41. Protection sleeve; 42. Heating component; 5. Valve needle sleeve; 6. Guide head; 7. Discharge port; 8. Flow channel; 9. Valve needle body; 10. Glue injection pipe; 11. Glue inlet pipe. Specific embodiments

[0021] The following is a detailed description by way of examples. However, the descriptions of the examples are not limitations on the solutions of the present utility model. Any formal but non-substantive equivalent transformation made based on the concept of the present utility model should be regarded as falling within the scope of the technical solutions of the present utility model.

[0022] In the following descriptions, all directional or positional concepts such as up, down, left, right, front, and back are based on the positions shown in the respective drawings, and thus cannot be understood as special limitations on the technical solutions provided by the present utility model.

[0023] Please refer to Figure 1 and in combination with Figure 2 with Figure 3 , which shows a one - to - two needle valve hot nozzle, including: an assembly plate 1, a hot nozzle body 4 is detachably installed below the assembly plate 1, a pair of guide heads 6 are installed at intervals at the lower end of the hot nozzle body 4, a pair of flow channels 8 are vertically penetrated through the hot nozzle body 4 at positions corresponding to the guide heads 6, the two guide heads 6 are respectively communicated with the corresponding flow channels 8, a valve needle body 9 is slidably arranged up and down in each of the flow channels 8, the distance between the two valve needle bodies 9 is 20 - 28 cm, preferably 22 cm in this embodiment, the valve needle bodies 9 respectively cooperate with the corresponding guide heads 6 to form a discharge port 7, a protection sleeve 41 is installed on the outer side wall of the hot nozzle body 4, and a heating component 42 is wound around the protection sleeve 41.

[0024] Furthermore, the heating power of the heating component 42 is 500W - 800W, preferably 600W in this embodiment; the heating component 42 is a heating pipe and is wound and embedded on the outer side wall of the protection sleeve 41.

[0025] During use, by providing power to the two valve needle bodies 9, the valve needle bodies 9 move up and down inside the corresponding flow channels 8 respectively, and then cooperate with the guide heads 6 to open or block the discharge port 7, and the plastic melt flows in the gap between the aforementioned flow channel 8 and the valve needle body 9.

[0026] By operating the heating component 42, heat is transferred to the nozzle body 4, and the plastic melt inside the nozzle body 4 is always kept in a molten state. To sum up, by simultaneously arranging a pair of guide heads 6 and a pair of valve needle bodies 9 in the nozzle body 4 and sharing the heating component 42 for heating, not only is the distance between the two valve needle bodies 9 greatly shortened, the arrangement distance between products is reduced, the size of the used mold is smaller, a smaller injection molding machine can be selected for production, the production cost is reduced, but also the heating power of the entire hot runner system is reduced, achieving the effect of energy saving, and at the same time further reducing the production cost.

[0027] Please continue to refer to Figure 1 With Figure 2 , a connection frame 2 is fixedly installed at the upper end of the assembly plate 1, a cylinder 3 is fixedly installed at the upper end of the connection frame 2, a valve needle sleeve 5 is respectively sleeved between the valve needle body 9 and the assembly plate 1, and the upper end of the valve needle body 9 is fixedly connected to the telescopic end of the cylinder 3 after passing through the assembly plate 1 and the connection frame 2, and the lower end of the valve needle body 9 respectively passes through the flow channel 8 and cooperates with the guide head 6.

[0028] In this embodiment, by operating the aforementioned cylinder 3, the telescopic end drives the two valve needle bodies 9 to move up and down, which can provide power for the valve needle body 9. The function of the valve needle sleeve 5 is to block the plastic melt on the outer wall of the valve needle body 9 in the flow channel 8 when the valve needle body 9 moves, preventing the plastic melt from being taken out with the valve needle body 9 to the outside.

[0029] Please refer to Figure 1 And in combination with Figure 2 , a glue injection tube 10 is provided in the middle of the nozzle body 4, and the lower end of the glue injection tube 10 is bifurcated to form a pair of glue inlet tubes 11. One ends of the two glue inlet tubes 11 are communicated with the glue injection tube 10, and the other ends respectively penetrate into the corresponding flow channels 8.

[0030] In this embodiment, by adding plastic melt into the glue injection tube 10, the plastic melt enters the two glue inlet tubes 11 from the inside of the glue injection tube 10, which is convenient for guiding the plastic melt. At the same time, the plastic melt inside the two glue inlet tubes 11 respectively enters the two flow channels 8.

[0031] Please refer to Figure 1 With Figure 2 And can be combined with Figure 3, the applicant briefly describes the working principle of the utility model: during use, the heating component 42 is operated to heat the nozzle body 4 and keep the plastic melt inside in a molten state. By controlling the operation of the cylinder 3, the telescopic end of the cylinder 3 drives the two valve needle bodies 9 to move upward. The two valve needle bodies 9 respectively move upward inside the two flow channels 8, thereby opening the discharge ports 7 between the two guiding heads 6 and the valve needle bodies 9. Then, the plastic melt enters the guiding heads 6 from the two flow channels 8 and flows out from the discharge ports 7 between the guiding heads 6 and the valve needle bodies 9. Finally, after the injection molding is completed, by operating the cylinder 3, the telescopic end of the cylinder 3 drives the two valve needle bodies 9 to move downward. The two valve needle bodies 9 respectively move downward inside the two flow channels 8 until the outer walls of the two valve needle bodies 9 respectively cooperate with the two guiding heads 6 to close the discharge ports 7, thereby preventing the outflow of the plastic melt.

[0032] In summary, the technical solution provided by the utility model makes up for the deficiencies in the existing technology, successfully completes the invention task, and faithfully realizes the technical effects described by the applicant in the technical effect column above.

Claims

1. Two-shot needle valve hot runner, characterized in that, include: An assembly plate (1), wherein a hot nozzle body (4) is detachably mounted below the assembly plate (1), a pair of guide heads (6) are installed at intervals at the lower end of the hot nozzle body (4), a pair of flow channels (8) are opened through the hot nozzle body (4) at positions corresponding to the guide heads (6) along the height direction, the two guide heads (6) are respectively connected to the corresponding flow channels (8), a valve needle body (9) is respectively arranged in the flow channel (8) to slide up and down, the valve needle body (9) cooperates with the corresponding guide head (6) to form a discharge port (7), a protective sleeve (41) is installed on the outer wall of the hot nozzle body (4), and a heating component (42) is coiled on the protective sleeve (41).

2. The two-cavity needle valve hot runner according to claim 1, wherein: A connecting frame (2) is fixedly mounted on the upper end of the assembly plate (1), and a cylinder (3) is fixedly mounted on the upper end of the connecting frame (2).

3. The two-cavity needle valve hot runner according to claim 1, characterized in that: The heating power of the heating component (42) is 500W-800W.

4. The two-in-one needle valve hot nozzle according to claim 1, wherein: A glue injection pipe (10) is provided in the middle of the hot nozzle body (4), and the lower end of the glue injection pipe (10) is bifurcated to form a pair of glue inlet pipes (11).

5. The two-in-one needle valve hot nozzle according to claim 2, characterized in that: A valve needle sleeve (5) is respectively sleeved between the valve needle body (9) and the assembly plate (1); the upper end of the valve needle body (9) is respectively fixed to the telescopic end of the cylinder (3) after passing through the assembly plate (1) and the connecting frame (2); and the lower end of the valve needle body (9) is respectively fitted with the guide head (6) after passing through the flow channel (8).

6. The two-in-one needle valve hot nozzle according to claim 3, wherein: The heating component (42) is a heating tube and is coiled and embedded on the outer wall of the protective sleeve (41).

7. The two-in-one needle valve hot nozzle according to claim 4, characterized in that: One end of the two glue inlet pipes (11) is connected to the glue injection pipe (10), and the other end thereof penetrates into the corresponding flow channel (8).

8. The two-in-one needle valve hot nozzle according to claim 1, characterized in that: The distance between the two valve needle bodies (9) is 20 to 28 cm.

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