Hot nozzle structure capable of sensing temperature accurately

Abstract

The utility model relates to a hot nozzle structure with accurate temperature sensing, which comprises a hot nozzle body and a temperature sensing line, the hot nozzle body is provided with an accommodating cavity for accommodating the temperature sensing line, the hot nozzle body is internally provided with a nozzle core and a sprue bush, the sprue bush is sleeved on the outer side of the nozzle core, the sprue bush is provided with a connecting groove penetrating along the width direction, and the connecting groove is communicated with the temperature sensing line. The nozzle core is provided with a temperature sensing groove, the two ends of the connecting groove are communicated with the containing cavity and the temperature sensing groove respectively, the temperature sensing line is provided with a temperature sensing probe, and the temperature sensing probe is arranged in the temperature sensing groove. According to the hot nozzle, the temperature sensing line is arranged, and the temperature sensing test point is arranged on the nozzle core, so that the temperature sensing accuracy of the hot nozzle pouring gate can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of hot runner injection molding technology, and more specifically, to a hot nozzle structure with accurate temperature sensing. Background Technology

[0002] Hot runner injection molding is a molding process in which molten plastic is injected into the mold cavity through a hot nozzle. The hot nozzle usually has a runner and a heater inside. After the molten plastic passes through the runner, it flows out from the gate at the bottom of the hot nozzle. The heater is usually arranged around the outside of the runner to heat the material inside the runner to achieve the required injection temperature.

[0003] Currently, to ensure the material reaches the gate temperature, the gate temperature needs to be measured before injection molding. However, since the hot runner's gate is located at the bottom and far from the heater, heat loss inevitably occurs when the heater heats the material according to the preset heating power, resulting in the actual gate temperature being lower than the expected temperature. Furthermore, most hot runners have their temperature sensing points located on the runner body, close to the heater. Therefore, the temperature measured by these points is higher than the actual gate temperature. Moreover, once the temperature reaches the set temperature, the temperature control box (the device controlling the heater's heating) stops outputting heating power and instead outputs heat preservation power, further lowering the actual gate temperature and preventing it from reaching the temperature set by the temperature control box. This low gate temperature leads to surface defects such as cold glue and air bubbles on the injection-molded product, affecting its appearance quality. Utility Model Content

[0004] In view of this, the present invention provides a hot nozzle structure that is accurate in temperature sensing and can effectively improve the appearance quality of injection molded products.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A temperature-sensitive nozzle structure includes a nozzle body and a temperature sensing wire. The nozzle body has a receiving cavity for accommodating the temperature sensing wire. Inside the nozzle body, there is a nozzle core and a gate valve. The gate valve is sleeved on the outside of the nozzle core. The gate valve has a connecting groove that extends through the width direction. The nozzle core has a temperature sensing groove. The two ends of the connecting groove are respectively connected to the receiving cavity and the temperature sensing groove. The temperature sensing wire has a temperature sensing probe, which is located inside the temperature sensing groove.

[0007] In the above technical solution, a gate is provided at the bottom of the hot nozzle body. The nozzle core and gate insert are installed at the bottom inside the hot nozzle body. The gate insert is sleeved on the outside of the nozzle core to provide insulation and pressure bearing. A through connecting groove is provided on the gate insert to connect the receiving cavity and the temperature sensing groove on the nozzle core. The temperature sensing wire is installed in the receiving cavity and the connecting groove. The temperature sensing probe at the end of the temperature sensing wire is installed in the temperature sensing groove on the nozzle core, so that the temperature at the nozzle core can be detected. Since the material is discharged from the gate after passing through the nozzle core, the temperature detected by the temperature sensing probe is closest to the actual temperature at the gate, and the measurement accuracy is higher. This ensures that the temperature control box outside the hot nozzle can obtain more accurate gate temperature data, which helps to better control and maintain the material temperature and improve the injection molding quality.

[0008] Optionally, in one embodiment, the hot nozzle body is provided with an opening, and the receiving cavity communicates with the outside through the opening.

[0009] In the above technical solution, the end of the temperature sensing wire away from the temperature sensing probe is located outside the hot nozzle body and connected to the corresponding detection device, thereby transmitting the data detected by the temperature sensing probe to the detection device.

[0010] Optionally, in one embodiment, the nozzle body has a flow channel inside, and the nozzle core is installed at the bottom of the flow channel and communicates with the flow channel.

[0011] In the above technical solution, the flow channel is used for material to pass through. After passing through the flow channel, the material enters the nozzle below and flows out from the gate at the bottom of the hot nozzle body.

[0012] Optionally, in one embodiment, a valve needle is installed in the flow channel and passes through the nozzle core.

[0013] In the above technical solution, the valve needle can block or open the gate at the bottom of the hot nozzle body by moving up and down, thereby controlling the hot nozzle switch.

[0014] Optionally, in one embodiment, a heat-insulating cap is fitted onto the bottom end of the nozzle.

[0015] In the above technical solution, the heat insulation cap is fitted at the bottom of the nozzle core to provide heat insulation, prevent the material from directly contacting the inner wall of the hot nozzle body after flowing out from the bottom of the nozzle core, reduce heat loss, and ensure the gate temperature.

[0016] Optionally, in one embodiment, a heater is mounted on the hot nozzle body, and the heater is embedded in the hot nozzle body.

[0017] In the above technical solution, the heater is embedded around the inside of the hot nozzle body to heat the material inside, so as to ensure its injection molding temperature.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This application sets a temperature sensing groove on the nozzle core of the hot nozzle body and sets the test point of the temperature sensing wire on the nozzle core, so that the temperature detected by the temperature sensing probe of the temperature sensing wire is closer to the actual temperature at the gate, the measurement accuracy is higher, it helps to better control and maintain the material temperature, avoid insufficient gate temperature leading to appearance defects on the surface of injection molded products, and effectively improve injection molding quality. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a perspective view of a heat nozzle structure with accurate temperature sensing according to an embodiment.

[0022] Figure 2 for Figure 1 Left view of the structure of the temperature-sensitive nozzle.

[0023] Explanation of the reference numerals in the figure:

[0024] 1-Hot nozzle body; 11-Gate; 12-Flow channel; 13-Opening; 2-Temperature sensing wire; 21-Temperature sensing probe; 3-Nose core; 31-Temperature sensing groove; 4-Gate fitting; 41-Connecting groove; 5-Valve needle; 6-Heat insulation cap; 7-Heater. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] Please refer to Figures 1 to 2 In a preferred embodiment of this utility model, a hot nozzle structure with accurate temperature sensing is provided, including a hot nozzle body 1 and a temperature sensing wire 2. The hot nozzle body 1 has a receiving cavity for accommodating the temperature sensing wire 2. The hot nozzle body 1 has a nozzle core 3 and a gate sprue 4 inside. The gate sprue 4 is sleeved on the outside of the nozzle core 3. The gate sprue 4 has a connecting groove 41 that runs through the width direction. The nozzle core 3 has a temperature sensing groove 31. The two ends of the connecting groove 41 are respectively connected to the receiving cavity and the temperature sensing groove 31. The temperature sensing wire 2 has a temperature sensing probe 21, which is located in the temperature sensing groove 31.

[0029] In this embodiment, the bottom of the hot nozzle body 1 is provided with a gate 11. The nozzle core 3 and the gate sprue 4 are installed inside the bottom of the hot nozzle body 1. The gate sprue 4 is sleeved on the outside of the nozzle core 3 and is used to insulate and bear pressure. The gate sprue 4 is provided with a horizontal connecting groove 41 that runs through the left and right sides. The connecting groove 41 connects the receiving cavity and the temperature sensing groove 31 on the nozzle core 3. The temperature sensing wire 2 is installed in the receiving cavity, and one end of it is provided with a temperature sensing probe 21. The temperature sensing probe 21 is installed in the temperature sensing groove 31 on the nozzle core 3 and is used to detect the temperature at that location.

[0030] It should be noted that since the material is discharged from the gate 11 after passing through the nozzle core 3, the temperature detected by the temperature sensing probe 21 is closest to the actual temperature at the gate 11, resulting in higher measurement accuracy.

[0031] Specifically, a heater 7 is installed on the hot nozzle body 1. The heater 7 is embedded inside the hot nozzle body 1 and is located outside the flow channel 12, nozzle core 3 and gate 4. The heater 7 is used to heat the internal material to ensure that it meets the temperature required for injection molding. A temperature control box (not shown in the figure) is provided outside the hot nozzle. The temperature control box is connected to the heater 7 and is used to supply power to the heater 7. The temperature data measured by the temperature sensor 21 is transmitted to the temperature control box. When the set injection molding temperature is not reached, the temperature control box will continue to output heating power to keep the heater 7 heating until the temperature measured by the temperature sensor 21 reaches the set temperature. Then the temperature control box stops outputting heating power and starts to output heat preservation power to keep the internal material at the set temperature for subsequent injection molding.

[0032] In this embodiment, the hot nozzle body 1 is provided with an opening 13, and the receiving cavity is connected to the outside through the opening 13. A detection device (not specifically shown in the figure) is provided on the outside of the hot nozzle. One end of the temperature sensing wire 2 is connected to the detection device, thereby transmitting the data detected by the temperature sensing probe 21 to the detection device.

[0033] In this embodiment, the hot nozzle body 1 is provided with a flow channel 12 inside. The top of the flow channel 12 extends through the top of the hot nozzle body 1. The nozzle core 3 is installed at the bottom of the flow channel 12 and is connected to the flow channel 12. The flow channel 12 is used to allow material to pass through. The material enters the flow channel 12 from the top of the hot nozzle body 1, passes through the flow channel 12 and enters the nozzle core 3 below. After passing through the nozzle core 3, it flows out from the gate 11 at the bottom of the hot nozzle body 1 to the cavity of the mold, thus completing the injection molding.

[0034] In this embodiment, a valve needle 5 is installed in the flow channel 12. The valve needle 5 passes through the nozzle core 3 and can move relative to the nozzle core 3. The valve needle 5 can block or open the gate 11 at the bottom of the hot nozzle body 1 by moving up and down, thereby controlling the hot nozzle switch.

[0035] In this embodiment, a heat insulation cap 6 is fitted at the bottom of the nozzle core 3. The heat insulation cap 6 is used for heat insulation to prevent the material from directly contacting the inner wall of the hot nozzle body 1 after flowing out from the bottom of the nozzle core 3, thereby reducing heat loss and ensuring the temperature of the gate 11. At the same time, it can also prevent the material from seeping into the gap between the nozzle core 3 and the hot nozzle body 1.

[0036] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A heating nozzle structure with accurate temperature sensing, characterized in that, The device includes a hot nozzle body and a temperature sensing wire. The hot nozzle body has a receiving cavity for accommodating the temperature sensing wire. Inside the hot nozzle body, there is a nozzle core and a gate valve. The gate valve is sleeved on the outside of the nozzle core and has a connecting groove that extends through the width direction. The nozzle core has a temperature sensing groove. The two ends of the connecting groove are respectively connected to the receiving cavity and the temperature sensing groove. The temperature sensing wire has a temperature sensing probe, which is located inside the temperature sensing groove.

2. The accurately temperature-sensing hot nozzle structure according to claim 1, characterized in that, The hot nozzle body has an opening, and the receiving cavity communicates with the outside through the opening.

3. The accurately temperature-sensing hot nozzle structure according to claim 1, characterized in that, The nozzle body has a flow channel inside, and the nozzle core is installed at the bottom of the flow channel and is connected to the flow channel.

4. The temperature-sensitive hot nozzle structure according to claim 3, characterized in that, A valve needle is installed inside the flow channel and passes through the nozzle core.

5. The temperature-sensitive hot nozzle structure according to claim 1, characterized in that, A heat-insulating cap is fitted onto the bottom end of the nozzle core.

6. The accurately temperature-sensing hot nozzle structure according to claim 1, characterized in that, A heater is installed on the hot nozzle body, and the heater is embedded in the hot nozzle body.

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