CN205853286U - A kind of structure of controlling temperature of hot runner mould - Google Patents

Abstract

The utility model provides a temperature control structure of a hot runner mold, which belongs to the technical field of mold manufacturing. It solves technical problems such as uneven temperature field in the existing mold. The hot runner mold includes a movable mold and a fixed mold. The movable mold and the fixed mold can be close to each other to form a cavity. The temperature control structure includes several medium circulation pipes on the movable mold and the fixed mold. The medium circulation pipes are distributed around the cavity at intervals. The diameter of the medium circulation pipe increases with the increase of the space distance in the thickness direction of the cavity; the movable mold or the fixed mold is equipped with a sensor for detecting the temperature of the surrounding area of the cavity, and the temperature control structure also includes a controller and can control the medium The heating module and the cooling module of the temperature of the medium in the circulation pipeline, the sensor, the heating module and the cooling module are all electrically connected with the controller. In the utility model, the uniformity of the mold temperature field is guaranteed through the design of the diameter of the medium circulation pipe.

Description

A temperature control structure of a hot runner mold

technical field

The utility model belongs to the technical field of mold manufacturing and relates to a temperature control structure of a hot runner mold.

Background technique

Mold is a tool used in industrial production for injection molding, blow molding, extrusion, die casting, smelting, stamping and other methods to obtain the required products. It has a specific contour or inner cavity shape; the application of the contour shape with cutting edges can separate the blank according to the contour line shape; the application of the inner cavity shape can make the blank obtain the corresponding three-dimensional shape; it has the advantages of simple processing, high efficiency, and the ability to obtain complex It has been widely used due to the advantages of products with different shapes; the hot runner mold is a mold that uses a heating device to keep the melt in the runner from solidifying. Because it has a shorter forming cycle than traditional molds and saves more raw materials, hot runner molds are widely used in various industrially developed countries and regions in the world today. Hot runner molds are generally divided into two groups of mold temperature during the molding process: one is the mold temperature before injection molding. According to the requirements of plastic molding process conditions, the initial mold temperature is generally set between 45°C and 75°C, and the mold temperature field is required The second is the cooling and solidification ejection temperature of plastic products, and the heat balance of injection molded parts in the mold cavity can reduce the shrinkage of the product and improve the molding quality of the product. The temperature control structure of the hot runner mold is an essential part of it.

Chinese patent (notification number: CN203680764U, publication date: 2014-07-02) discloses a mold that can be rapidly cooled, including a fixed mold and a movable mold opposite to the fixed mold. The fixed mold includes a panel, an A plate and a pouring device. The movable mold includes plate B, push-out mechanism, die foot and bottom plate. A cavity is set at the junction of plate A and plate B, a core is set at the position corresponding to the cavity of plate B, and a cooling system is set around the cavity. The system consists of multiple independent cooling pipes, and the vertical distance from the cooling water pipe to the cavity is equal, and the ratio of the distance to the diameter of the cooling water pipe is 1 to 1.2. The cooling pipe includes an inlet pipe and an outlet pipe, and the inlet pipe is set close to the point gate. , the ratio of the vertical distance from the point gate to the inlet pipe to the diameter of the point gate is 0.8 to 1, the vertical distance from the inlet pipe to the outlet pipe is equal to the vertical distance of the adjacent cooling pipe, and the ratio of the distance to the diameter of the cooling pipe 3 to 5.

The mold structure disclosed in the above patent is equipped with several independent cooling pipes, all cooling pipes are controlled uniformly, and the medium flow rate in each pipe is the same, because the thickness of the plastic parts in the mold cavity is different, it is difficult to ensure the uniformity of the mold temperature field sex.

Contents of the invention

The utility model aims at the above-mentioned problems existing in the existing technology, and provides a temperature control structure of a hot runner mold. The technical problem to be solved by the utility model is: how to control the temperature in the mold and ensure the uniformity of the temperature field.

The purpose of this utility model can be achieved through the following technical solutions:

A temperature control structure of a hot runner mold, the hot runner mold includes a movable mold and a fixed mold, the movable mold and the fixed mold can be close to each other to form a mold cavity, it is characterized in that the temperature control structure includes a movable mold and a fixed mold Several medium circulation pipes are set up, and the medium circulation pipes are distributed around the cavity at intervals, and the diameter of the medium circulation pipeline becomes larger with the increase of the space distance in the thickness direction of the cavity; the dynamic The mold or fixed mold is provided with a sensor for detecting the temperature of the surrounding area of the cavity, and the temperature control structure also includes a controller, a heating module and a cooling module capable of controlling the temperature of the medium in the medium circulation channel, the sensor, Both the heating module and the cooling module are electrically connected with the controller.

Its working principle is as follows: Since the wall thickness of molded products is not uniform and regular, the cavity space required for different wall thicknesses is also different, and the amount of molten plastic required for different positions in the cavity is also different. When maintaining heat or cooling and solidifying, the heat required for heat exchange is also different. In this technical solution, a number of medium circulation pipes are set in the mold, and fluid medium (such as hot oil, cooling liquid, etc.) can flow through the medium circulation pipes. The circulation pipes are arranged and designed according to the wall thickness of the molded product, that is, the diameter of the medium circulation pipe corresponding to the position where the wall thickness of the molded product is larger in the cavity is also large, and the efficiency of heat exchange per unit time is also higher, satisfying Temperature control needs. In this technical solution, only one sensor is needed for temperature measurement and control feedback. When the temperature is close to the required temperature, the controller controls the heating module and the cooling module to stop heating or cooling.

The temperature control structure in this technical solution can be used to control the mold temperature before injection molding and the cooling and solidification ejection temperature of plastic products; according to the requirements of plastic molding process conditions, the initial mold temperature is generally set between 45°C and 75°C, and plastic products The cooling and solidification ejection temperature is generally set between 80°C and 90°C. The heat balance of the injection molded product in the cavity can reduce the shrinkage of the product and improve the molding quality of the product. In this technical solution, the uniformity of the temperature field of the mold is guaranteed through the design of the diameter of the medium circulation pipe.

In the temperature control structure of the above-mentioned hot runner mold, the space distance in the thickness direction of the cavity gradually increases from the two sides of the cavity to the middle, and the diameter of the medium circulation pipe is different from that in the thickness direction of the cavity. The spatial distance is proportional to . The shape and structure of the cavity is designed according to the shape of the product, and the diameter of the medium circulation pipe changes accordingly, so as to ensure the uniformity of the temperature field of the mold.

In the above-mentioned temperature control structure of the hot runner mold, a flow channel communicating with the cavity is opened on the fixed mold, the flow channel is connected to the middle of the cavity, and the medium circulation pipes are distributed in both sides of the flow channel. The molten plastic coming out of the runner can be conveniently controlled for temperature, which is efficient and reliable.

In the above-mentioned temperature control structure of the hot runner mold, the space distance in the thickness direction of the cavity changes linearly from both sides of the cavity to the middle, and the flow direction of each of the medium circulation channels is the same as the width of the mold. The directions are the same and the diameters of the individual medium circulation pipes are the same, and the diameters of the medium circulation pipes arranged from both sides of the cavity to the middle increase sequentially in direct proportion. This makes the temperature transfer more uniform and ensures the uniformity of the mold temperature field.

In the above temperature control structure of the hot runner mold, all the medium circulation channels are evenly spaced along the periphery of the cavity; the minimum distances between all the medium flow channels and the edge of the cavity are equal. In this way, the cooling is more efficient and uniform, and the sensor can be installed at any position, which can also ensure the accuracy of the detected temperature value, thereby ensuring the reliability and accuracy of mold temperature control.

Compared with the prior art, through the design of the diameter of the medium circulation pipeline in the utility model, the diameter of the medium circulation pipeline corresponding to the position where the wall thickness of the molded product in the cavity is relatively large is also large, ensuring the temperature field of the mold. Even consistency.

Description of drawings

Fig. 1 is a schematic cross-sectional structure diagram of a mould.

FIG. 2 is a schematic structural diagram of the control circuit of the present temperature control structure.

In the figure, 1. moving mold; 2. fixed mold; 21. runner; 3. cavity; 4. medium circulation pipe; 5. sensor; 6. heating module; 7. cooling module; 8. controller.

detailed description

The following are specific embodiments of the utility model and in conjunction with the accompanying drawings, the technical solution of the utility model is further described, but the utility model is not limited to these embodiments.

This temperature control structure is used to control the mold temperature before injection molding and the cooling and solidification ejection temperature of plastic products. According to the requirements of plastic molding process conditions, the initial mold temperature is generally set between 45°C and 75°C, and the cooling and solidification ejection temperature of plastic products The temperature is generally set between 80°C and 90°C; as shown in Figure 1 and Figure 2, this hot runner mold includes a movable mold 1 and a fixed mold 2, and the movable mold 1 and the fixed mold 2 can move closer to each other to form a cavity 3. The control structure includes several medium circulation pipes 4 set up on the movable mold 1 and the fixed mold 2. The medium circulation pipes 4 are distributed around the cavity 3 at intervals. The diameter of the medium circulation pipeline 4 increases with the space distance in the thickness direction of the cavity 3. Larger and larger; the movable mold 1 or the fixed mold 2 is provided with a sensor 5 for detecting the temperature of the surrounding area of the cavity 3, and the temperature control structure also includes a controller 8 and a heating module 6 capable of controlling the temperature of the medium in the medium circulation pipe 4 and The cooling module 7, the sensor 5, the heating module 6 and the cooling module 7 are all electrically connected to the controller 8; since the wall thickness of the molded product is not uniform, the space spacing of the cavity 3 required by the different wall thickness is also different , the amount of molten plastic required at different positions in the cavity 3 is also different, and the amount of heat required for heat exchange is also different when maintaining heat or cooling and solidifying. In this embodiment, several medium circulation pipes 4 are set in the mold , fluid medium such as hot oil, coolant, etc. can flow in the medium circulation pipeline 4, and the layout and design of the medium circulation pipeline 4 are carried out according to the wall thickness of the molded product, that is, the medium corresponding to the position with a relatively large wall thickness of the molded product in the cavity 3 The pipe diameter of the circulation pipe 4 is also large, and the heat exchange efficiency per unit time is also high, which meets the temperature control requirement. In this embodiment, only one sensor 5 is needed for temperature measurement and control feedback. When the temperature is close to the required temperature, the controller 8 controls the heating module 6 and the cooling module 7 to stop heating or cooling; the heat balance of the injection molded product in the cavity 3 can be reduced. The shrinkage of the product improves the molding quality of the product. In this embodiment, the uniformity of the temperature field of the mold is ensured through the design of the diameter of the medium circulation pipe 4 .

As shown in Figure 1, the fixed mold 2 is provided with a flow channel 21 connected to the cavity 3, the flow channel 21 is connected to the middle of the cavity 3, and the medium circulation pipes 4 are distributed on both sides of the flow channel 21; all medium flow The pipes 4 are evenly spaced along the periphery of the cavity 3; the minimum distances between all the medium circulation pipes 4 and the edge of the cavity 3 are equal. Further, in this embodiment, the space spacing in the thickness direction of the cavity 3 gradually increases from both sides of the cavity 3 to the middle, and the diameter of the medium circulation pipe 4 is proportional to the space spacing in the thickness direction of the cavity 3, and the cavity The shape structure of 3 is designed according to the shape of the product, and the diameter of the medium circulation pipe 4 changes accordingly, so as to ensure the uniformity of the temperature field of the mold; the space distance in the thickness direction of the cavity 3 is from the two sides of the cavity 3 to the middle Changes linearly, the flow direction of each medium circulation pipe 4 is consistent with the width direction of the mould, and the diameter of each medium circulation pipe 4 is the same, and the diameters of the medium circulation pipes 4 arranged from both sides of the cavity 3 to the middle are positive in turn. The ratio increases, which makes the temperature transfer more uniform and ensures the uniformity of the mold temperature field.

The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the utility model or go beyond the appended claims defined range.

Although this article uses 1. moving mold; 2. fixed mold; 21. runner; 3. cavity; 4. medium flow pipe; 5. sensor; 6. heating module; 7. cooling module; terms such as device, but does not exclude the possibility of using other terms. These terms are only used to describe and explain the essence of the utility model more conveniently; interpreting them as any kind of additional limitation is contrary to the spirit of the utility model.

Claims (5)

1. a structure of controlling temperature for hot runner mould, hot runner mould includes dynamic model (1) and cover half (2), described dynamic model (1) and fixed Mould (2) can draw close formation die cavity (3) in opposite directions, it is characterised in that described structure of controlling temperature includes opening on dynamic model (1) and cover half (2) If several medium circulation tube roads (4), described medium circulation tube road (4) is distributed in described die cavity (3) around, is given an account of The thread a pipe caliber of (4) of mass flow increases with the spatial separation on described die cavity (3) thickness direction and becomes big；Described dynamic model (1) or Cover half (2) is provided with the sensor (5) for detecting described die cavity (3) neighboring area temperature, and described structure of controlling temperature also includes control Device processed (8) and heating module (6) and refrigerating module (7), the institute of the interior medium temperature of described medium circulation tube road (4) can be controlled State sensor (5), heating module (6) and refrigerating module (7) all to electrically connect with described controller (8).

The structure of controlling temperature of hot runner mould the most according to claim 1, it is characterised in that described die cavity (3) thickness direction On spatial separation be gradually increased by the two of die cavity (3) lateral middle parts, the caliber of described medium circulation tube road (4) and described die cavity (3) spatial separation on thickness direction is proportional.

The structure of controlling temperature of hot runner mould the most according to claim 2, it is characterised in that described cover half offers on (2) The runner (21) being connected with described die cavity (3), described runner (21) is connected to the middle part of described die cavity (3), described medium stream Thread a pipe (4) be distributed in the both sides of described runner (21).

The structure of controlling temperature of hot runner mould the most according to claim 3, it is characterised in that described die cavity (3) thickness direction On spatial separation linearly changed by the two of die cavity (3) lateral middle parts, the flow direction of each described medium circulation tube road (4) all with The width of described mould is consistent and single described medium circulation tube road (4) caliber is the most identical, by the two of die cavity (3) lateral in The most proportional example of medium circulation tube road (4) caliber of portion's arrangement increases.

5. according to the structure of controlling temperature of the hot runner mould described in claim 1 or 2 or 3 or 4, it is characterised in that all given an account of Mass flow thread a pipe (4) along described die cavity (3) periphery uniform intervals be distributed；All described medium circulation tube roads (4) and described type Minimum range between chamber (3) edge is the most equal.