A multi-point needle valve hot runner system

Abstract

The utility model relates to the technical field of hot runners, and discloses a multi-point needle valve hot runner system, including a manifold with a manifold inside, a glue inlet connected to the manifold is provided on the manifold, a groove is also provided on the manifold, a heating pipe is arranged in the groove; the heating pipe includes a heat pipe body corresponding to the shape of the groove and used to heat the manifold, and both ends of the heat pipe body pass through the groove to the outside of the manifold. The plastic melt flows into the manifold inside the manifold through the glue inlet, and then generates heat in the groove through the heat pipe body of the heating pipe. The heat is transferred to the manifold through the manifold to evenly heat the plastic melt flowing in the manifold, ensuring the heat balance of each area on the manifold, solving the problems of slow flow rate and internal blockage caused by overheating decomposition or overcooling of the plastic melt in the manifold, and improving the yield of injection molding products.

Description

Technical Field

[0001] The utility model relates to the technical field of hot runners, in particular to a multi-point needle valve type hot runner system. Background Art

[0002] The multi-point needle valve hot runner system is a common hot runner system used for injection molding. It can realize multi-point simultaneous injection, improve production efficiency and product quality. It not only has high injection accuracy and short molding cycle, but also has a wide range of applications. Among them, the multi-point needle valve can control the switch of the needle valve to achieve precise control of the melt.

[0003] In most existing multi-cavity hot runner mold systems, the small size, multiple arrangements and structural heterogeneity of the injection molded products greatly limit the application of hot runner heating tubes, making it impossible to evenly arrange the hot runner heating system on the manifold, resulting in unbalanced and uncontrollable heat in various areas of the manifold, causing the plastic melt in the runner to decompose due to overheating or overcooling, resulting in slow flow rate, internal blockage and other undesirable problems. Utility Model Content

[0004] The problem to be solved by the utility model is to provide a multi-point needle valve type hot runner system, in which the heat pipe body of the heat pipe generates heat in the groove, and the heat is transferred to the runner through the manifold, so as to evenly heat the plastic melt in the runner to ensure the heat balance of each area on the manifold, and avoid the plastic melt in the runner from decomposing due to overheating or overcooling, causing slow flow rate, internal blockage and other undesirable problems.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A multi-point needle valve hot runner system comprises a manifold having a flow channel therein, a glue inlet connected to the flow channel is provided on the manifold, a groove is provided on the manifold, a heating pipe is provided in the groove; the heating pipe comprises a heat pipe body corresponding to the shape of the groove and used for heating the flow channel, and both ends of the heat pipe body pass through the groove to the outside of the manifold.

[0007] In a preferred embodiment of the utility model, the heat pipe further comprises a terminal for connecting to an external power source, the terminal is connected to the end of the heat pipe body, and a bushing is provided at the connection between the heat pipe body and the terminal.

[0008] In a preferred embodiment of the present invention, the diameter of the heat pipe body is 3.3 mm, the diameter of the terminal is 1.5 mm, and the outer diameter of the bushing is 5.5 mm.

[0009] In a preferred embodiment of the utility model, a gate sleeve is installed on the top of the diverter plate corresponding to the position of the glue inlet, and a plurality of hot nozzle mechanisms are installed on the bottom of the diverter plate, and the plurality of hot nozzle mechanisms are all connected to the flow channel.

[0010] In a preferred embodiment of the utility model, a positioning mechanism is fixedly installed at the bottom of the diverter plate corresponding to the position of the glue inlet.

[0011] In a preferred embodiment of the utility model, two grooves are provided, and the two grooves are respectively arranged on the upper and lower sides of the diverter plate, and the heating tube is installed in each groove.

[0012] Beneficial effects:

[0013] (1) In the present invention, the plastic melt flows into the flow channel inside the manifold through the plastic inlet, and then generates heat in the groove through the heat pipe body of the heat pipe. The heat is transferred to the flow channel through the manifold, and the plastic melt flowing in the flow channel is evenly heated, ensuring the heat balance of each area on the manifold, solving the problems of slow flow rate and internal blockage caused by overheating or overcooling of the plastic melt in the flow channel, thereby improving the yield of injection molded products.

[0014] (2) For the above-mentioned heat pipe, the diameter of the heat pipe body is designed to be 3.3 mm; the heat pipe has compressed the heating power ratio to the extreme, that is, the diameter of the heat pipe body is reduced to the minimum under the premise of ensuring that the heating power meets the demand; this structure increases the arrangement space of the heat pipe, provides more possibilities for the design scheme, and can solve the problem that ordinary heat pipes cannot be arranged due to compact spacing.

[0015] (3) There are two grooves, which are respectively arranged on the upper and lower sides of the manifold. The corresponding heating tubes inside the grooves can ensure that the temperature of the upper and lower sides of the manifold is consistent, ensuring that the temperature of the plastic melt in the manifold is within the set value, thereby improving the yield of the injection molded product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is a schematic diagram of the axonometric structure of the utility model;

[0018] Figure 3 It is a side view structural schematic diagram of the utility model;

[0019] Figure 4 It is a schematic diagram of the explosion structure of the utility model;

[0020] Figure 5 yes Figure 3A cross-sectional view of section A;

[0021] Figure 6 yes Figure 3 Sectional view of section C;

[0022] Among them, 1. manifold; 11. glue inlet; 12. runner; 2. groove; 3. heating pipe; 31. heat pipe body; 32. bushing; 33. terminal; 4. gate sleeve; 5. hot nozzle mechanism; 6. positioning mechanism. DETAILED DESCRIPTION

[0023] The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0024] like Figure 1-Figure 3 As shown, a multi-point needle valve hot runner system includes a manifold 1 with a flow channel 12 inside, a glue inlet 11 connected to the flow channel 12 is opened on the manifold 1, a gate sleeve 4 is installed on the top of the manifold 1 corresponding to the position of the glue inlet 11, and a plurality of hot nozzle mechanisms 5 are installed on the bottom of the manifold 1, and the plurality of hot nozzle mechanisms 5 are all connected to the flow channel 12.

[0025] As described above, the plastic melt is ejected from the nozzle of the injection molding machine, flows along the sprue sleeve 4 to the glue inlet 11, then enters the flow channel 12 inside the manifold 1, and after being diverted by the flow channel 12, finally enters the corresponding hot nozzle mechanism 5, and then is injected into the mold cavity along the hot nozzle mechanism 5.

[0026] Among them, the sprue sleeve 4 is also called a nozzle, a filling nozzle, and a sprue filling. Its function is to allow the molten plastic to be injected from the nozzle of the injection molding machine into the flow channel 12 inside the manifold 1. The lower end of the sprue sleeve 4 can be embedded in the glue inlet 11. Under the premise of ensuring the sealing, the sprue sleeve 4 can also be positioned on the manifold 1, and then it is fixed and installed on the manifold 1 by bolt connection; the hot nozzle mechanism 5 is also called a hot runner nozzle. Its hot nozzle body is an important component of the hot runner system in a multi-cavity mold. It can send the plastic melt in the manifold 1 to the cavity through itself and maintain the melting temperature to prevent the plastic from decomposing.

[0027] Furthermore, a positioning mechanism 6 is fixedly installed at the bottom of the diverter plate 1 corresponding to the position of the glue inlet 11; the positioning mechanism 6 includes a positioning ring, which is fixedly installed at the bottom of the diverter plate 1 by screws, and the positioning ring is coaxial with the glue inlet 11; its function is to provide support for the diverter plate 1 and facilitate its positioning work during installation.

[0028] like Figure 4-Figure 5As shown, a groove 2 is also provided on the diverter plate 1, and a heat pipe 3 is arranged in the groove 2. The heat pipe 3 includes a heat pipe body 31 corresponding to the shape of the groove 2 and used to heat the flow channel 12, and both ends of the heat pipe body 31 pass through the groove 2 to the outside of the diverter plate 1.

[0029] As mentioned above, the heat pipe body 31 of the heat pipe 3 can generate heat in the groove 2 (based on the thermal effect of electric current), and the heat is transferred to the flow channel 12 through the manifold 1, and the plastic melt flowing in the flow channel 12 is evenly heated, ensuring the heat balance of each area on the manifold 1, solving the problems of slow flow rate, internal blockage and the like caused by overheating decomposition or overcooling of the plastic melt in the flow channel 12, and improving the yield of injection molded products.

[0030] Furthermore, the heat pipe 3 further includes a terminal 33 for connecting to an external power source. The terminal 33 is connected to the end of the heat pipe body 31 , and a bushing 32 is provided at the connection between the heat pipe body 31 and the terminal 33 .

[0031] The heat pipe body 31 is made of a stainless steel alloy with high heat resistance, corrosion resistance and good tensile strength. It is located in the main area of ​​the groove 2 and is an important component of the heat pipe 3. It plays a heating role when powered on; the terminal 33 is made of a stainless steel material with good conductivity. It is located at the end of the heat pipe body 31 and is used to connect an external power line; the bushing 32 is made of a titanium alloy material with low thermal conductivity and high hardness. It is located at the heating end of the heat pipe 3 and is used to connect the heat pipe body 31 and the terminal 33.

[0032] The diameter of the heat pipe body 31 is 3.3 mm, the diameter of the terminal 33 is 1.5 mm, and the outer diameter of the bushing 32 is 5.5 mm. A stepped hole is provided inside the bushing 32, one end of which is used to connect to the terminal 33, and the other end is used to connect to the heat pipe body 31. The heat pipe 3 is fixed in the groove 2 on the manifold 1 by pressing, and the heat pipe body 31 of the heat pipe 3 is in contact with the side of the groove 2 to facilitate heat transfer.

[0033] There are usually two forms for installing the heating pipe 3 and the groove 2. One is to adopt a transition fit method, which requires that insulating cement be filled in the groove 2. The other is to adopt an interference fit method, which requires that a small boss be provided in the groove 2 to clamp the heat pipe body 31 of the heating pipe 3. In this system, the heating pipe 3 and the groove 2 are installed using a transition fit, and the covering cement is not shown in the figure.

[0034] The heating power ratio of the heat pipe 3 is compressed to the extreme, that is, the diameter of the heat pipe body 31 is reduced to a minimum under the premise of ensuring that the heating power meets the demand; if the diameter of the heat pipe body 31 is greater than 3.3 mm, it is not conducive to the arrangement of the heat pipe 3 in a compact space, and if the diameter of the heat pipe body 31 is less than 3.3 mm, the heating power cannot meet the demand. Therefore, the diameter of the heat pipe body 31 is designed to be 3.3 mm to increase the arrangement space of the heat pipe 3, which provides more possibilities for the design scheme and can solve the problem that ordinary heat pipes 3 cannot be arranged due to compact spacing.

[0035] In order to facilitate the connection of external power lines and management, both ends of the heat pipe body 31 pass through the groove 2 in the horizontal direction to the outside of the diverter plate 1, and both ends of the heat pipe body 31 are located on the same side of the diverter plate 1, that is, the two terminals 33 of the heat pipe 3 are on the same side of the diverter plate 1.

[0036] In addition, there are two grooves 2 on the diverter plate 1, which are respectively arranged on the upper and lower sides of the diverter plate 1, and a heat pipe 3 is installed in each groove 2. The 3.3mm heat pipe body 31 is fixed in the grooves 2 on the upper and lower surfaces of the diverter plate 1, and the arrangement of the grooves 2 determines the position of the heat pipe 3.

[0037] like Figure 1-Figure 2 , Figure 4-Figure 6 As shown, viewed from the side of the sprue sleeve 4, the arrangement of the heat pipe 3 is that the heat pipe body 31 enters the groove 2 through either side of the diverter plate 1, passes through the space of only 13 mm between the bottom of the sprue sleeve 4 and the positioning mechanism 6 along the flow channel 12, and then continuously surrounds the narrow area above the hot nozzle body with a diameter of only 14 mm in a semicircular arc, which is as close as possible to the outer shape distribution of the hot nozzle mechanism 5, and the flow channel 12 can be evenly heated wherever it passes.

[0038] Viewed from the hot nozzle mechanism 5 side, the arrangement of the heating tubes 3 is the same as that on the sprue sleeve 4 side, and the two heating tubes 3 are arranged symmetrically up and down to ensure that the temperatures above and below the manifold 1 are consistent.

[0039] From the perspective of the overall system, the heating tube 3 is arranged along the direction of the flow channel 12. Its main function is to ensure that the temperature of the melt is monitored and controlled along the path (flow channel 12) from the sprue sleeve 4 to the hot nozzle mechanism 5, ensuring that the temperature of the plastic melt in the diverter plate 1 is within the set value, thereby improving the yield of the injection molded product.

[0040] In summary, by using the heat pipe 3 composed of the bushing 32, the terminal 33 and the 3.3mm heat pipe body 31, it can be evenly arranged on the manifold 1, so that the heat is transferred to the narrow required position, ensuring that the molten colloid passes through the flow channel 12 at the set temperature; so that the heat of each area is balanced, avoiding the plastic melt in the flow channel 12 due to overheating decomposition or overcooling causing slow flow rate, internal blockage and other undesirable problems.

[0041] The above is based on the ideal embodiment of the utility model. Through the above description, relevant personnel can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of this utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A multi-point needle valve hot runner system, comprising a manifold (1) having a flow channel (12) therein, the manifold (1) being provided with a glue inlet (11) communicating with the flow channel (12), characterized in that: The diverter plate (1) is also provided with a groove (2), and a heating pipe (3) is arranged in the groove (2); the heating pipe (3) comprises a heat pipe body (31) corresponding to the shape of the groove (2) and used for heating the flow channel (12), and both ends of the heat pipe body (31) pass through the groove (2) to the outside of the diverter plate (1).

2. The multi-point needle valve hot runner system according to claim 1, characterized in that: The heat pipe (3) further comprises a terminal (33) for connecting to an external power source, the terminal (33) being connected to the end of the heat pipe body (31), and a bushing (32) being sleeved at the connection between the heat pipe body (31) and the terminal (33).

3. The multi-point needle valve hot runner system according to claim 2, characterized in that: The diameter of the heat pipe body (31) is 3.3 mm, the diameter of the terminal (33) is 1.5 mm, and the outer diameter of the bushing (32) is 5.5 mm.

4. The multi-point needle valve hot runner system according to claim 3, characterized in that: A sprue sleeve (4) is installed on the top of the manifold (1) at a position corresponding to the glue inlet (11), and a plurality of hot nozzle mechanisms (5) are installed on the bottom of the manifold (1), and the plurality of hot nozzle mechanisms (5) are all connected to the flow channel (12).

5. The multi-point needle valve hot runner system according to claim 4, characterized in that: A positioning mechanism (6) is fixedly mounted on the bottom of the diverter plate (1) at a position corresponding to the glue inlet (11).

6. The multi-point needle valve hot runner system according to any one of claims 1 to 5, characterized in that: Two grooves (2) are provided, and the two grooves (2) are respectively arranged on the upper and lower sides of the diverter plate (1), and the heating pipe (3) is installed in each groove (2).

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