High-strength hot runner system

Abstract

The utility model belongs to the technical field of hot runners, and particularly relates to a high-strength hot runner system which comprises a hot runner plate, a nozzle and a first heating piece, the hot runner plate comprises an upper outer wall, an end wall, a bottom wall, a side wall and a top wall of a runner, the end wall is connected with the side wall, the bottom wall is respectively connected with the side wall and the end wall, and the top wall is respectively connected with the side wall and the end wall. The upper outer wall surrounds the end wall and the side wall; a fluid feeding hole is formed in the top wall, and a fluid discharging hole is formed in the nozzle; according to the hot runner system, the reliability of each runner plate can be realized through concave-convex matching and bolt connection of a frame structure and a step structure, and the runner system is kept stable during high-speed filling; the stepped structure is adopted, so that quick disassembly and replacement are realized; the temperature control structure design of a preheating runner, a heating runner and nozzle heating in the hot runner plate can be optimized in stages, the temperature field is finely regulated and controlled, and process parameters are flexibly adapted.

Description

TECHNICAL FIELD

[0001] The utility model relates to hot runner technical field, concretely is a high strength hot runner system. BACKGROUND

[0002] As the core process of plastic product production, the efficiency and quality of injection molding directly affect the production cost and product competitiveness. The hot runner system can reduce the sprue waste, improve the filling speed and optimize the performance of the plastic part by maintaining the molten state of the melt in the runner. However, with the development of the industry towards high speed, precision and multi-material adaptation, the traditional hot runner system faces the following problems:

[0003] 1. Insufficient structural stability: the melt pressure can reach 200-300MPa during high-speed injection, and the traditional hot runner plate is prone to deformation or leakage due to insufficient rigidity of the connection method (such as flat flange + pin positioning), which can cause size deviation or flash of the plastic part; poor adaptability to complex conditions: multi-material co-injection, thin-walled plastic parts, and heat-sensitive materials (such as LCP, PC) require high uniformity of the temperature field, and the traditional system hot runner plate connection technology flat flange + bolt connection: requires high-precision machining and complex centering, is prone to looseness under long-term high pressure, and has limited temperature and pressure resistance (≤200℃, 150MPa).

[0004] 2. Temperature control technology

[0005] Single heating zone design: the hot runner plate and nozzle share the same heating system, which cannot differentiate the temperature control for the melt flow path, and the temperature gradient can reach ±10℃; and slow response speed: from start to stable, it takes 30-60 minutes, and has large thermal inertia, which cannot adapt to periodic process fluctuations. INVENTION CONTENTS

[0006] To solve the above technical problems, according to one aspect of the utility model, the utility model provides the following technical scheme:

[0007] A high-strength hot runner system, comprising a hot runner plate, a nozzle, and a first heating element, the hot runner plate comprising an upper outer wall, an end wall, a bottom wall, a side wall, and a top wall of the runner, the end wall being connected to the side wall, the bottom wall being connected to the side wall and the end wall respectively, the top wall being connected to the side wall and the end wall respectively, and the upper outer wall surrounding the end wall and the side wall;

[0008] The bottom wall and the side wall are provided with a heating runner and a first heating element for heating the fluid in the heating runner, and the first heating element is connected with the nozzle; the bottom wall is provided with a lower outer wall connected with the upper outer wall, and the upper outer wall and the lower outer wall are connected in a stepped structure;

[0009] The top wall and the side wall are connected by a stepped structure, and a first sealing ring is provided at the connection of the stepped structure between the top wall and the side wall; a second sealing ring is provided at the bottom of the upper outer wall and the side wall.

[0010] The top wall is provided with a fluid inlet, and the nozzle is provided with a fluid outlet.

[0011] At least one side of the lower outer wall is provided with a housing located outside the first heating element and the nozzle. The housing is provided with a first reinforcing plate and a second reinforcing plate. The first reinforcing plate is fixedly connected to the side wall, and the second reinforcing plate is fixedly connected to the lower outer wall.

[0012] The hot runner plate has multiple channels, each channel having a channel inlet and a channel outlet. The channels include a preheating channel in the bottom wall and side wall. The preheating channel has an inlet, and a heating channel is located near the inlet. A first heating element is located in the heating channel, and a nozzle is connected to the first heating element. A temperature controller is located on the first heating element.

[0013] The first heating element is equipped with a first thermocouple for measuring the temperature of the fluid, and the first thermocouple is electrically connected to the temperature controller.

[0014] The nozzle is equipped with a second thermocouple and a second heating element for measuring fluid temperature. The second thermocouple and the second heating element are electrically connected to the temperature controller, respectively.

[0015] Compared with existing technologies: A high-strength hot runner system includes a hot runner plate, nozzles, and a first heating element. The hot runner plate comprises an upper outer wall, end walls, bottom walls, side walls, and a top wall connected to form a frame structure. The stepped structure's interlocking fit and bolted connections ensure the reliability of each runner plate, guaranteeing the stability of the runner system during high-speed filling. The stepped structure also allows for quick disassembly and replacement without a complex alignment process, reducing maintenance costs.

[0016] The temperature control structure design, which combines preheating channels, heating channels, and nozzle heating within the hot runner plate, allows for phased optimization, precise temperature field control, and flexible adaptation of process parameters. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the specific embodiment of this utility model. Figure One ;

[0018] Figure 2 is a schematic diagram of the specific embodiment of this utility model. Figure Two ;

[0019] Figure 3 is a schematic diagram of the internal structure of this utility model;

[0020] Figure 4 is Figure 3 A schematic diagram of the structure of A in the middle;

[0021] Figure 5 is a structural schematic diagram of the B in Figure 4. Figure 3 Figure 5 is a structural schematic diagram of the B in Figure 4. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the utility model more clear, the embodiments of the utility model will be described in further detail below with reference to the drawings.

[0023] The utility model provides a kind of high-strength hot runner system, please refer to Figure 1-5, including hot runner plate 1, nozzle 2, first heating piece 6, the hot runner plate 1 includes upper outer wall 11, end wall 12, bottom wall 13, side wall 14 and top wall 15 connection and become frame structure, it is mainly from top to bottom flow mode;Its material uses high-strength alloy: using high-temperature resistant, creep-resistant die steel (such as H13, S7), can withstand 300-400 ℃ high temperature and injection pressure (usually reaches 100-200MPa);And its surface is treated as follows: by nitriding, chrome plating or PVD coating etc. Strengthen wear resistance and corrosion resistance.

[0024] Wherein, end wall 12 is connected with side wall 14, bottom wall 13 is connected with side wall 14 and end wall 12 respectively, top wall 15 is connected with side wall 14 and end wall 12 respectively, upper outer wall 11 surrounds end wall 12 and side wall 14;Its connection mainly uses stepped structure cooperation, the bottom wall 13 is equipped with lower outer wall 16 connected with upper outer wall 11, upper outer wall 11 and lower outer wall 16 are connected with stepped structure cooperation, the top wall 15 is connected with side wall 14 with stepped structure cooperation;The concave-convex cooperation of stepped structure can realize the quick and accurate centering of each flow channel plate, by increasing contact area and mechanical fitting, high pressure, high temperature load in injection process is evenly distributed, reduces local stress concentration, avoids deformation or fracture due to long-term stress at connecting place, can effectively limit the transverse displacement of flow channel plate under injection pressure, ensure that flow channel system remains stable when filling at high speed;In high-temperature environment, material thermal expansion can cause gap to appear in plane connection, and the stepped surface of stepped structure can dynamically compensate the slight deformation due to expansion, maintain sealing effect;Stepped structure adopts bolt connection, without complex centering process, it can realize quick disassembly and replacement, reduce maintenance cost.

[0025] Further, the stepped structure of the upper outer wall 11 outside the bottom wall 13 is connected with the lower outer wall 16, the upper outer wall 11 and the lower outer wall 16 are connected in a stepped structure, the top wall 15 inside the upper outer wall 11 is connected with the side wall 14 in a stepped structure, the side wall 14 is connected with the bottom wall 13 in a stepped structure, and in the 1-3 diagram, the stepped structure is a two-step structure; in some embodiments, a multi-step structure can also be used to improve reliability.

[0026] In some specific embodiments, a sealing member is then used for sealing; a first sealing ring 141 is arranged at the stepped structure connection between the top wall 15 and the side wall 14, a second sealing ring 142 is arranged at the bottom of the upper outer wall 11 and the side wall 14, and a third sealing ring 143 is arranged at the inner wall connection between the side wall 14 and the bottom wall 13, and a high-temperature-resistant sealing ring (such as fluorine rubber and metal bellows) is used for the two or more steps of the stepped structure, which significantly reduces the risk of molten resin leakage.

[0027] The stepped structure can be automatically corrected by interference fit or guide surface design even if there is a slight machining tolerance, which improves the assembly accuracy of the system.

[0028] In some specific embodiments, a housing 7 is arranged at least on one side of the lower outer wall 16 outside the first heating member 6 and the nozzle 2, the housing 7 is respectively provided with a first reinforcing plate 71 and a second reinforcing plate 72, the first reinforcing plate 71 is fixedly connected with the side wall 14, and the second reinforcing plate 72 is fixedly connected with the lower outer wall 16, which improves the reliability.

[0029] The heating system is described in detail below in combination with the housing 7 and the hot runner plate 1, the hot runner plate 1 has a plurality of flow channels 5 and each flow channel 5 has a flow channel inlet and a flow channel outlet, the flow channel 5 includes a preheating flow channel 51 in the bottom wall 13 and the side wall 14, the material enters the preheating flow channel 51 through the inlet 511 of the preheating flow channel 51, the heating flow channel 52 is arranged near the inlet 511, the first heating member 6 is arranged for heating the fluid in the heating flow channel 5, and the nozzle 2 is connected to the first heating member 6; the temperature controller 4 is arranged on the first heating member 6.

[0030] The material enters the heating flow channel 52 through the preheating flow channel 51 and is sprayed out of the nozzle 2 after reaching the required temperature.

[0031] In some specific embodiments, the second heating element 23 is arranged at the nozzle 2 to control the temperature again before injection, which has double temperature control in this embodiment, and strict temperature control before injection into the mold, and the temperature control structure design of preheating flow channel 51 + heating flow channel 52 + nozzle 2 heating, which improves the problems of the hot runner system in energy consumption, response speed and complex working condition adaptability through staged optimization, temperature field fine tuning and process parameter flexible adaptation, and is especially suitable for high-precision plastic parts, heat-sensitive materials and multi-cavity molds.

[0032] In further embodiments, the preheating flow channel 51 is sequentially provided with a preheating element 8, a first heating element 6 and a second heating element 23 between each flow channel inlet and each flow channel outlet, the preheating element 8 is a heating device in the system startup stage, which can quickly raise the flow channel temperature to a preset value, has independent heating module, has fast response capability, can shorten the preheating time of starting, and improve the production efficiency; the first heating element 6 is the main heating unit of the hot runner system, which is responsible for maintaining the core temperature of the hot runner plate 1 to ensure that the plastic melt does not solidify during transportation; for example, the first heating element 6 is a heating rod or a heating pipe, which is a reciprocating heating rod or a heating pipe in this embodiment, which uniformly transfers heat; the second heating element 23 is an auxiliary heating and temperature control component of the nozzle 2, which is used to adjust the temperature before injection into the mold cavity, and a spiral heating wire is arranged around the end of the nozzle 2 in this embodiment to prevent solidification.

[0033] In further embodiments, the first heating element 6 is provided with a first thermocouple 61 for measuring the temperature of the fluid, and the first thermocouple 61 is electrically connected to the temperature controller 4.

[0034] In further embodiments, the nozzle 2 is provided with a second thermocouple 22 for measuring the temperature of the fluid, and the second thermocouple 22 is electrically connected to the temperature controller 4, and a thermocouple can also be arranged in the preheating flow channel 51 to accurately control the temperature, which is not shown in the figure.

[0035] In specific embodiments, the temperature controller 4 is a PID temperature controller, which collects temperature data of the hot runner, if the resin temperature is higher than the set temperature value and the difference is not within the set temperature interval, the PID output of the first heating element 6 and the second heating element 23 is reduced; if the resin temperature is lower than the set temperature value and the difference is not within the set temperature interval, the PID output of the first heating element 6 and the second heating element 23 is increased; if the temperature is within the set temperature interval, the PID output of the first heating element 6 and the second heating element 23 is maintained.

[0036] The components preheating piece 8, first heating piece 6 and second heating piece 23, temperature controller 4, hot runner plate 1, nozzle 2 and the like constitute a complete system, and the quality of plastic parts is improved and waste is reduced through accurate temperature control.

[0037] Although the utility model has been described above with reference to the embodiments, various improvements can be made and equivalent parts can be replaced without departing from the scope of the utility model. In particular, as long as there is no structural conflict, the features in the embodiments disclosed by the utility model can be combined in any way, and the combinations are not exhaustively described in the specification only for the purpose of omitting length and saving resources. Therefore, the utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A high-strength hot runner system, characterized in that, The device includes a hot runner plate, a nozzle, and a first heating element. The hot runner plate includes an upper outer wall, an end wall, a bottom wall, a side wall, and a top wall. The end wall is connected to the side wall, the bottom wall is connected to both the side wall and the end wall, and the top wall is connected to both the side wall and the end wall. The upper outer wall surrounds the end wall and the side wall. The bottom wall and side wall are provided with heating channels and a first heating element for heating the fluid in the heating channels, and the first heating element is connected to a nozzle; The top wall is provided with a fluid inlet, and the nozzle is provided with a fluid outlet; The bottom wall is provided with a lower outer wall that is connected to the upper outer wall. The upper outer wall and the lower outer wall are connected by a stepped structure. The top wall and the side wall are connected by a stepped structure, and a first sealing ring is provided at the connection of the stepped structure between the top wall and the side wall; a second sealing ring is provided at the bottom of the upper outer wall and the side wall.

2. The high-strength hot runner system according to claim 1, characterized in that, At least one side of the lower outer wall is provided with a housing located outside the first heating element and the nozzle. The housing is provided with a first reinforcing plate and a second reinforcing plate. The first reinforcing plate is fixedly connected to the side wall, and the second reinforcing plate is fixedly connected to the lower outer wall.

3. A high-strength hot runner system according to claim 1, characterized in that, The hot runner plate has multiple channels, each channel having a channel inlet and a channel outlet. The channels include a preheating channel in the bottom wall and side wall. The preheating channel has an inlet, and a heating channel is located near the inlet. A first heating element is located in the heating channel, and a nozzle is connected to the first heating element. A temperature controller is located on the first heating element.

4. A high-strength hot runner system according to claim 3, characterized in that, The first heating element is equipped with a first thermocouple for measuring the temperature of the fluid, and the first thermocouple is electrically connected to the temperature controller.

5. A high-strength hot runner system according to claim 3, characterized in that, The nozzle is equipped with a second thermocouple and a second heating element for measuring fluid temperature. The second thermocouple and the second heating element are electrically connected to the temperature controller, respectively.

Images