Hot runner structure of injection mold

Abstract

The utility model relates to a hot runner structure of an injection mold in the field of injection molds, which comprises a main nozzle, a splitter plate and more than two hot nozzles, the splitter plate is provided with a heating tube, the surface of the splitter plate is provided with a heated channel, the surface of the splitter plate is provided with a heat-insulating outer frame and a heat-insulating plate, the heat-insulating outer frame is sleeved on the side wall of the splitter plate, and the heat-insulating plate is sleeved on the side wall of the splitter plate. The heat preservation plate covers an opening of the heat preservation outer frame, the heat preservation outer frame and the heat preservation plate are combined to form a heat preservation cavity, the splitter plate is located in the heat preservation cavity, the heat preservation outer frame and the heat preservation plate are connected with the splitter plate through bolts, a plurality of evenly-arranged heat insulation cavities are formed in the heat preservation outer frame and the heat preservation plate, and the two ends of the heating pipe penetrate through the heat preservation outer frame and are connected with a controller. The heat exchange between the splitter plate and the external environment is effectively blocked, the heat loss is greatly reduced, the defects of uneven filling, shrinkage, flash and the like caused by temperature fluctuation are reduced, and the forming quality and consistency of products are remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection mold field, especially a hot runner structure of injection mold. BACKGROUND

[0002] The hot runner system of injection mold is an important component in modern injection molding technology, its main function is to deliver the molten plastic from the nozzle of injection molding machine to the mold cavity. Compared with the traditional cold runner system, the hot runner system can avoid the generation of flow channel condensate, reduce material waste, shorten the molding cycle, improve production efficiency. In addition, the hot runner system can also accurately control the temperature of the melt, ensure that the melt maintains good fluidity during the flow process, thereby improving the molding quality and consistency of the product. Therefore, the hot runner system has been widely used in precision injection, large injection and multi-cavity injection fields.

[0003] The hot runner system is mainly divided into two types of open hot runner and needle valve hot runner according to its structure and function. The open hot runner structure is simple, the cost is lower, and it is suitable for occasions with low product quality requirements. The needle valve hot runner can realize more accurate filling and more complex molding process through the needle valve control of melt flow, and is suitable for occasions with high product quality requirements. No matter which type of hot runner system, the core components include main nozzle, flow distribution plate, hot nozzle and heating element, etc.

[0004] The existing hot runner structure has some defects, especially in the heat preservation performance, many hot runner structures cannot effectively block the heat exchange between the flow distribution plate and the external environment, resulting in serious heat loss. This not only affects the temperature stability and uniformity of the melt, but also may cause filling unevenness, shrinkage, flash and other injection defects. UTILITY MODEL CONTENTS

[0005] In order to overcome the deficiencies of the prior art, the utility model provides a hot runner structure of injection mold, which can effectively solve the technical problem of serious heat loss.

[0006] The technical scheme adopted by the utility model to solve its technical problems is:

[0007] The hot runner structure of the injection mold comprises a main nozzle, a distribution plate and two or more hot nozzles, the distribution plate is provided with a distribution channel and a main channel, the main channel is communicated with the distribution channel, the main nozzle is communicated with one end of the main channel away from the distribution channel, the two or more hot nozzles are communicated with the end of the distribution channel, the distribution plate is provided with a heating tube, the surface of the distribution plate is provided with a heated channel, the surface of the distribution plate is provided with a heat preservation outer frame and a heat preservation plate, the heat preservation outer frame is sleeved on the side wall of the distribution plate, the heat preservation plate covers the opening of the heat preservation outer frame, the heat preservation outer frame and the heat preservation plate form a heat preservation cavity after being combined, the distribution plate is located in the heat preservation cavity, the heat preservation plate is provided with an avoiding opening for passing through the main nozzle and the hot nozzle, the heat preservation outer frame and the heat preservation plate are connected with the distribution plate through bolts, and the heat preservation outer frame and the heat preservation plate are both provided with a plurality of evenly arranged heat insulation cavities, and the two ends of the heating tube pass through the heat preservation outer frame and are connected with a controller.

[0008] Further, the edge of the heated channel is provided with a positioning step, one side of the heat preservation plate close to the distribution plate is provided with a positioning convex strip, and the positioning convex strip can be inserted into the positioning step in pairs when the heat preservation plate is combined with the heat preservation outer frame.

[0009] Further, the heat preservation plate is provided with a temperature detector, the distribution plate is provided with a temperature measuring hole, the probe of the temperature detector extends to the temperature measuring hole through the heat preservation plate, and the temperature detector is electrically connected with the controller.

[0010] Further, the heat preservation outer frame and the heat preservation plate are both composed of foamed ceramic, and the surfaces of the heat preservation outer frame and the heat preservation plate are covered with thermal barrier coatings.

[0011] Further, the main nozzle is connected with the main channel through threads.

[0012] Further, the distribution plate is provided with a cooling water channel, the cooling water channel extends to the side wall of the distribution plate and is connected with an electric control valve, the electric control valve is provided with a water pipe interface, and the electric control valve is electrically connected with the controller.

[0013] Compared with the prior art, the heat preservation outer frame and the heat preservation plate are arranged, the heat preservation cavity is formed by combining the heat preservation outer frame and the heat preservation plate, and the distribution plate is wrapped therein, heat exchange between the distribution plate and the external environment is effectively blocked, and heat loss is greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a three-dimensional schematic view of the utility model;

[0015] Figure 2 is a three-dimensional schematic view of the hidden insulation board in the utility model;

[0016] Figure 3 is a structural schematic view of the utility model;

[0017] Figure 4 is Figure 3 is a local enlarged view of A in the figure;

[0018] Figure 5 is a schematic view of the cooling water channel in the utility model;

[0019] Figure 6 is a sectional view of the insulation board and the insulation outer frame in the utility model;

[0020] Reference signs in the figure: 1-main nozzle, 2-shunt plate, 201-shunt channel, 202-main channel, 203-heated channel, 204-positioning step, 205-temperature measuring hole, 206-cooling water channel, 3-hot nozzle, 4-heating tube, 5-insulation outer frame, 501-insulation cavity, 6-insulation board, 601-positioning convex strip, 7-temperature detector, 8-electric control valve, 9-controller, 10-thermal barrier coating. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0022] The hot runner structure of the injection mold of the utility model will be described in detail below: Figures 1-6

[0023] ​The hot runner structure of the injection mold comprises a main nozzle 1, a distribution plate 2 and two hot nozzles 3, the distribution plate 2 is provided with a distribution channel 201 and a main channel 202, the main channel 202 communicates with the distribution channel 201, the main nozzle 1 communicates with the end of the main channel 202 away from the distribution channel 201, and the two hot nozzles 3 communicate with the end of the distribution channel 201, the main nozzle 1 is connected with the main channel 202 through threads, so that the disassembly and maintenance of the main nozzle 1 become more convenient. The operator can easily disassemble the main nozzle 1 for cleaning, inspection or replacement, thereby reducing the maintenance cost and improving the work efficiency, the distribution plate 2 is provided with a heating tube 4, the surface of the distribution plate 2 is provided with a heated channel 203, the surface of the distribution plate 2 is provided with a heat preservation outer frame 5 and a heat preservation plate 6, the heat preservation outer frame 5 is sleeved on the side wall of the distribution plate 2, the heat preservation plate 6 covers the opening of the heat preservation outer frame 5, the heat preservation outer frame 5 and the heat preservation plate 6 form a heat preservation cavity after being combined, the heat preservation outer frame 5 and the heat preservation plate 6 are both composed of foamed ceramic, the surface of the heat preservation outer frame 5 and the heat preservation plate 6 is covered with a thermal barrier coating 10, and the heat preservation and heat insulation performance of the hot runner structure is significantly improved. The foamed ceramic has excellent high-temperature resistance and heat insulation performance, the thermal barrier coating 10 can further reduce heat loss, ensures the stability of the melt temperature in the hot runner, and prolongs the service life of the mold, the distribution plate 2 is located in the heat preservation cavity, the heat preservation plate 6 is provided with avoiding openings for the main nozzle 1 and the hot nozzles 3 to pass through, the heat preservation outer frame 5 and the heat preservation plate 6 are connected with the distribution plate 2 through bolts, and a plurality of evenly arranged heat insulation cavities 501 are arranged in the heat preservation outer frame 5 and the heat preservation plate 6, and the two ends of the heating tube 4 pass through the heat preservation outer frame 5 and are connected with a controller 9.

[0024] The heat preservation outer frame 5 and the heat preservation plate 6 are combined to form a closed heat preservation cavity, and the distribution plate 2 is wrapped therein. The heat exchange between the distribution plate 2 and the external environment is effectively blocked, and the heat loss is greatly reduced. Meanwhile, the plurality of evenly arranged heat insulation cavities 501 arranged in the heat preservation outer frame 5 and the heat preservation plate 6 further enhance the heat insulation effect, and ensure the high uniformity and stability of the melt temperature in the hot runner. The stable temperature environment enables the melt to maintain consistent viscosity during the flowing process, reduces defects such as uneven filling, shrinkage and flash caused by temperature fluctuation, and significantly improves the forming quality and consistency of the product. The heat preservation structure effectively reduces the thermal expansion and contraction of the distribution plate 2, reduces the generation of thermal stress, and prolongs the service life of the mold. The heat preservation outer frame 5 and the heat preservation plate 6 are connected with the distribution plate 2 through bolts, which is not only convenient for disassembly and maintenance, but also protects the distribution plate 2 to a certain extent and reduces the damage of the external environment to the distribution plate 2. The heat preservation outer frame 5 and the heat preservation plate 6 are connected with the distribution plate 2 through bolts, which is very convenient for installation and disassembly. When the distribution plate 2 or the heating tube 4 needs to be maintained, the heat preservation outer frame 5 and the heat preservation plate 6 can be disassembled, without the need to disassemble the mold on a large scale, thereby greatly reducing the maintenance difficulty and time cost.

[0025] The edge of the heated channel 203 is provided with a positioning step 204, and the heat preservation plate 6 is provided with a positioning convex strip 601 close to one side of the distribution plate 2, the positioning convex strip 601 can be matched and inserted into the positioning step 204 when the heat preservation plate 6 is combined with the heat preservation outer frame 5, so that the accurate positioning between the heat preservation plate 6 and the distribution plate 2 is realized. Not only the assembly process is simplified, but also the assembly precision and stability are greatly improved, and the overall performance of the hot runner structure is ensured.

[0026] The temperature detector 7 is arranged on the heat preservation plate 6, the distribution plate 2 is provided with a temperature measuring hole 205, the probe of the temperature detector 7 extends to the temperature measuring hole 205 through the heat preservation plate 6, the temperature detector 7 is electrically connected with the controller 9, the real-time monitoring of the temperature of the distribution plate 2 is realized, the operator can know the temperature condition in the hot runner at any time, the control parameter is adjusted in time, the stability and uniformity of the melt temperature are ensured, and the forming quality of the product is further improved.

[0027] The cooling water channel 206 is arranged in the distribution plate 2, the cooling water channel 206 extends to the side wall of the distribution plate 2 and is connected with the electric control valve 8, the water pipe interface is arranged on the electric control valve 8, the electric control valve 8 is electrically connected with the controller 9, the operator can open or close the electric control valve 8 according to the need through the controller 9, the cooling water flow is adjusted, so that the temperature of the distribution plate 2 is effectively controlled, and the stability and service life of the hot runner structure are ensured.

[0028] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the involved claims.

Claims

1. A hot runner structure of an injection mold, comprising a main nozzle, a manifold, and two or more hot nozzles, the manifold being provided with a manifold channel and a main channel, the main channel being in communication with the manifold channel, the main nozzle being in communication with an end of the main channel away from the manifold channel, and the two or more hot nozzles each being in communication with an end of the manifold channel, characterized in that: The heating pipe is arranged on the shunt plate, the surface of the shunt plate is provided with a heated channel, the surface of the shunt plate is provided with a heat preservation outer frame and a heat preservation plate, the heat preservation outer frame is sleeved on the side wall of the shunt plate, the heat preservation plate covers the opening of the heat preservation outer frame, the heat preservation outer frame and the heat preservation plate form a heat preservation cavity after being combined, the shunt plate is located in the heat preservation cavity, the heat preservation plate is provided with a avoiding opening for the main nozzle and the heating nozzle, the heat preservation outer frame and the heat preservation plate are connected with the shunt plate through bolts, a plurality of evenly arranged heat insulation cavities are arranged in the heat preservation outer frame and the heat preservation plate, and the two ends of the heating pipe pass through the heat preservation outer frame and are connected with a controller.

2. The hot runner structure of an injection mold according to claim 1, wherein: The edge of the heated channel is provided with a positioning step, and the side of the heat preservation plate close to the shunt plate is provided with a positioning convex strip, the positioning convex strip can be inserted into the positioning step in pairs when the heat preservation plate is combined with the heat preservation outer frame.

3. The hot runner structure of an injection mold according to claim 1, wherein: The heat preservation plate is provided with a temperature detector, the shunt plate is provided with a temperature measuring hole, the probe of the temperature detector extends to the temperature measuring hole through the heat preservation plate, and the temperature detector is electrically connected with the controller.

4. The hot runner structure of an injection mold according to any one of claims 1 to 3, characterized in that: The heat preservation outer frame and the heat preservation plate are both composed of foamed ceramic, and the surfaces of the heat preservation outer frame and the heat preservation plate are covered with thermal barrier coatings.

5. The hot runner structure of an injection mold according to any one of claims 1 to 3, characterized in that: The main nozzle is connected with the main flow channel through threads.

6. The hot runner structure of an injection mold according to any one of claims 1 to 3, characterized in that: The shunt plate is provided with a cooling water channel, the cooling water channel extends to the side wall of the shunt plate and is connected with an electric control valve, the electric control valve is provided with a water pipe interface, and the electric control valve is electrically connected with the controller.

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