A hot runner injection mold for a plastic power battery cover plate

Abstract

The utility model relates to power battery cover plate plastic injection technology field, and disclose a kind of power battery cover plate plastic piece hot runner injection mold, including upper die part and lower die part, the upper die part from top to bottom sequentially includes upper die plate, upper die fixed plate and upper die, the lower die part includes lower die, lower die fixed plate and lower die plate, the lower side of upper die fixed plate is equipped with hot runner plate, the inside of hot runner plate is equipped with multiple groups hot runner circuit, and the hot runner circuit is connected with needle valve type nozzle.This power battery cover plate plastic piece hot runner injection mold, can reduce the cost of gateless injection mold, simple structure, convenient to use and good stability, effectively improve the service life of mould;No waste material is generated in product forming process, reducing product waste loss;Without personnel to remove gate, can reduce two personnel's manual input every day, reduce labor cost and production cost, can improve enterprise product competitive advantage.

Description

Technical Field

[0001] This utility model relates to the field of plastic injection molding technology for power battery cover plates, specifically a hot runner injection mold for power battery cover plate plastic parts. Background Technology

[0002] The plastic parts of the power battery cover are an important component of the power battery cover assembly. They have to perform multiple functions, such as ensuring the stable fixation of the battery module under vibration, impact and other conditions, preventing structural loosening, and achieving an IP67 or higher protection level through a sealing design to isolate moisture, dust and electrolyte leakage.

[0003] Existing battery cover plastic parts are indispensable. Most plastic parts use cold runner injection molds, which inject plastic into the mold by side or top injection. The mold is equipped with cold runners that run through all injection points of the product. After injection molding, the plastic material in the cold runners solidifies and forms excess gates outside the product shape, resulting in material waste. Subsequently, it is necessary to have a specialist remove the generated gates, resulting in labor waste. Therefore, there is an urgent need for a hot runner injection mold for power battery cover plastic parts. Utility Model Content

[0004] The purpose of this utility model is to provide a hot runner injection mold for a power battery cover plastic part to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a hot runner injection mold for a power battery cover plastic part, comprising an upper mold part and a lower mold part. The upper mold part includes, from top to bottom, an upper template, an upper mold fixing plate, and an upper mold. The lower mold part includes a lower mold, a lower mold fixing plate, and a lower template. A hot runner plate is provided below the upper mold fixing plate. The hot runner plate has multiple sets of hot runner circuits inside. The hot runner circuits are connected to needle valve nozzles. The upper mold fixing plate has a main channel in the middle, which is connected to the hot runner circuit. The upper mold plate has a cylinder inside, and the output shaft of the cylinder is connected to a needle valve. The hot runner plate has a solenoid valve signal junction box on one side, which is electrically connected to the cylinder. The upper mold fixing plate has a hot runner junction box on one side, which is electrically connected to the hot runner circuit. The lower mold fixing plate has an ejector plate at the bottom.

[0006] Preferably, the upper mold is provided with a plurality of relief grooves, and the needle valve nozzle passes through the relief grooves and communicates with the injection mold cavity.

[0007] Preferably, the hot runner circuit is electrically connected to the temperature control box via a hot runner junction box, and the temperature control box is used to adjust the temperature of the hot runner circuit.

[0008] Preferably, the solenoid valve signal junction box is connected to the cylinder via a cylinder control button.

[0009] Preferably, a control panel is also provided on one side of the upper mold fixing plate. The control panel is provided with a temperature control button and a cylinder control button, which are used to control the heating of the hot runner circuit and the operation of the cylinder, respectively.

[0010] Preferably, the upper and lower templates are mounted on the injection molding machine via positioning rings.

[0011] Preferably, the ejector plate is fixedly connected to the lower template.

[0012] Compared with the prior art, the beneficial effects achieved by this utility model are: First, this utility model provides a cost-reducing injection mold without a sprue. It has a simple structure, is easy to use, and has good stability, effectively improving the service life of the mold. No waste is generated during the product molding process, reducing product waste loss. No personnel are required to remove the sprue, which can reduce the labor input of two people per day, reducing labor and production costs and enhancing the competitive advantage of the enterprise's products.

[0013] Secondly, this utility model provides a cost-reducing gateless injection mold, which consists of an upper mold and a lower mold. When the upper and lower molds are closed, the mold closes to form an injection cavity. A hot runner plate is provided above the upper mold, and a hot runner is provided on the hot runner plate. The hot runner is connected to the main nozzle, and several needle valve nozzles are provided on the hot runner. Several relief grooves are provided on the upper mold. The needle valve nozzles pass through the relief grooves and communicate with the injection cavity. The needle valve nozzles are set on the structural features of the product itself for injection molding. After cooling through the cooling water channel, the mold opens, and the product molding is completed. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a front view structural diagram of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of this utility model; Figure 4 This is a top view of the structure of this utility model.

[0015] The components are: 1. Upper mold plate; 2. Upper mold fixing plate; 3. Upper mold; 4. Lower mold; 5. Lower mold fixing plate; 6. Lower mold plate; 7. Hot runner circuit; 8. Positioning ring; 9. Solenoid valve signal junction box; 10. Hot runner junction box; 11. Main runner; 12. Hot runner plate; 13. Cylinder; 15. Ejector plate. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] This utility model provides the following technical solution: Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 A hot runner injection mold for a power battery cover plastic part includes an upper mold part and a lower mold part. The upper mold part includes an upper template 1, an upper mold fixing plate 2 and an upper mold 3 from top to bottom. The lower mold part includes a lower mold 4, a lower mold fixing plate 5 and a lower template 6. A hot runner plate 12 is provided below the upper mold fixing plate 2. Multiple sets of hot runner circuits 7 are provided inside the hot runner plate 12. The hot runner circuits 7 are connected to needle valve nozzles. The upper mold fixing plate 2 has a main channel 11 in the middle, which is connected to the hot runner circuit 7. The upper mold plate 1 has a cylinder 13 inside, and the output shaft of the cylinder 13 is connected to the needle valve. The hot runner plate 12 has a solenoid valve signal junction box 9 on one side, which is electrically connected to the cylinder 13. The upper mold fixing plate 2 has a hot runner junction box 10 on one side, which is electrically connected to the hot runner circuit 7. The lower mold fixing plate 5 has an ejector plate 15 at the bottom.

[0018] Through the above technical solution, the layered design of the upper and lower mold sections not only ensures the overall structural strength of the mold but also facilitates subsequent mold maintenance, such as replacing vulnerable parts. The hot runner plate 12 added below the upper mold fixing plate 2 provides a stable mounting carrier for multiple sets of hot runner circuits 7, avoiding heat conduction loss caused by direct contact between the hot runner and the mold body. The central main runner 11 serves as the melt inlet, accurately guiding the plastic melt delivered by the injection molding machine into multiple sets of hot runner circuits 7, achieving uniform material distribution with one inlet and multiple outlets, adapting to the mass production needs of power battery cover plastic parts. The connection between the hot runner circuit 7 and the needle valve nozzle is compared to the traditional Cold runner molds can completely prevent the melt from cooling and forming cold slug heads in the runner, reducing material waste. At the same time, they can eliminate surface defects such as spots and missing material in plastic parts caused by cold material entering the mold cavity. The cylinder 13 in the upper mold plate 1 directly drives the needle valve to operate. With the stable signal transmission of the solenoid valve signal junction box 9, the needle valve opening and closing can be accurately synchronized to avoid melt backflow or untimely filling. The hot runner junction box 10 provides a standardized electrical connection interface for the hot runner circuit 7 to ensure stable transmission of temperature control signals. The ejector plate 15 at the bottom of the lower mold fixing plate 5 reserves the execution parts for subsequent demolding of plastic parts, providing support for the complete production process.

[0019] The upper mold 3 is provided with several relief grooves, and the needle valve nozzle passes through the relief grooves and communicates with the injection mold cavity.

[0020] Through the above technical solution, the dimensions of the several relief grooves opened in the upper mold 3 are precisely matched with the shape of the needle valve nozzle. This provides a stable installation and positioning reference for the nozzle, and the sealing is achieved through the fit of the groove walls, preventing the melt from leaking from the gap between the nozzle and the upper mold during the filling process. After passing through the relief groove, the nozzle directly connects to the injection mold cavity, which can minimize the flow distance of the melt from the nozzle to the mold cavity, reduce the heat loss of the melt during the transmission process, and ensure that the melt fills the mold cavity with optimal fluidity. This is especially suitable for the precision molding requirements of power battery cover plastic parts, avoiding defects such as incomplete filling of ribs and deformation of holes caused by insufficient melt fluidity.

[0021] The hot runner circuit 7 is electrically connected to the temperature control box via the hot runner junction box 10. The temperature control box is used to regulate the temperature of the hot runner circuit 7.

[0022] Through the above technical solution, the hot runner junction box 10, as an intermediate transfer component, can centrally integrate the temperature detection signals of multiple hot runner circuits 7 with the control signals of the temperature control box, avoiding signal interference caused by messy wiring of a single circuit, and ensuring the accuracy of temperature data transmission. The core function of the temperature control box is to dynamically adjust the heating power of the hot runner circuit 7 according to the melting characteristics of the plastic raw material used in the power battery cover, thereby achieving precise and stable temperature control of the hot runner circuit 7 and ensuring the molding performance of the plastic melt.

[0023] The solenoid valve signal junction box 9 is connected to the cylinder 13 via the cylinder control button.

[0024] Through the above technical solution, the cylinder control button, as a direct operating component, allows the operator to adjust the timing of the cylinder 13's action in real time according to the actual injection molding conditions, thus making up for the lack of adaptability of pure automatic control under special working conditions. The presence of the solenoid valve signal junction box 9 can convert the mechanical signal of the cylinder control button into a stable electrical signal, and transmit it to the solenoid valve of the cylinder 13 through a shielded cable. This avoids electromagnetic interference from other equipment in the workshop that could cause cylinder action delays or malfunctions, ensuring the synchronization of needle valve switching and melt filling, and reducing flash or material shortages in plastic parts caused by asynchronous actions.

[0025] A control panel is also provided on one side of the upper mold fixing plate 2. The control panel is equipped with a temperature control button and a cylinder control button, which are used to control the heating of the hot runner circuit 7 and the operation of the cylinder 13, respectively.

[0026] Through the above technical solution, the control panel integrates the temperature control button and the cylinder control button into the same operating interface. Operators no longer need to switch back and forth between the hot runner junction box 10, the solenoid valve signal junction box 9, or the temperature control box. It can complete the entire process control of hot runner preheating, needle valve debugging, and injection molding start-up, which is suitable for the rapid production changeover needs in mass production. The control panel also has parameter visualization and memory functions. The temperature control button can display the actual temperature of the current hot runner circuit in real time and synchronize it with the temperature control box data, which makes it convenient for operators to intuitively monitor temperature stability. The cylinder control button can remember the previous action parameters, so there is no need to repeat the debugging when changing to produce the same model of plastic parts, ensuring the consistency of parameters in multiple batches of production and reducing the quality difference of plastic parts caused by parameter fluctuations.

[0027] The upper template 1 and the lower template 6 are installed on the injection molding machine via the positioning ring 8.

[0028] Through the above technical solution, the inner hole size of the positioning ring 8 is precisely matched with the positioning boss of the injection molding machine. During installation, the positioning ring can quickly achieve coaxial positioning of the upper mold plate 1, lower mold plate 6 and injection molding machine, ensuring that the mold closing center is completely coincident with the injection center of the injection molding machine. This avoids mold cavity damage caused by misalignment of the upper mold 3 and lower mold 4 during mold closing, and also prevents uneven filling of the mold cavity due to center offset during melt injection. The positioning ring 8 can also withstand the radial impact force during mold installation, preventing the mounting surfaces of the upper mold plate 1 and lower mold plate 6 from directly contacting and wearing with the injection molding machine, thus extending the service life of the mold mounting surfaces. In addition, the standardized design of the positioning ring can be adapted to different models of injection molding machines, improving the versatility of the mold.

[0029] The ejector plate 15 is fixedly connected to the lower template 6.

[0030] Through the above technical solution, the ejector plate 15 and the lower mold plate 6 are fixed with bolts, which can ensure that the ejector pins on the ejector plate are precisely aligned with the ejector pin holes in the mold cavity of the lower mold 4, avoiding mold cavity scratches or ejector pin breakage caused by ejector pin misalignment. At the same time, the fixed connection can evenly transmit the demolding force to the ejector plate, and then distribute it to the surface of the plastic part through the ejector pins, avoiding deformation of the plastic part caused by excessive local demolding force. Compared with the movable ejector plate, the fixed connection can also reduce gap shaking during demolding, reduce noise, and prevent dust and debris from entering the gap between the ejector plate and the lower mold plate, reducing the risk of ejector pin jamming and ensuring the smoothness of demolding action.

[0031] In actual operation, when this device is in use, the upper mold plate 1 and the lower mold plate 6 are installed on the plastic injection machine via the positioning ring 8. The plastic injection machine moves the upper mold plate 1 and the upper mold 3, etc., to close the mold. The temperature of the temperature control box is controlled by the temperature control button, which in turn changes the hot runner circuit 7 and heats the main runner 11. The plastic injection machine is controlled to perform injection molding. After a certain amount of plastic is injected, the solenoid valve signal junction box 9 controls the needle valve. After a certain delay, the cylinder 13 pushes the needle valve to block the injection runner, stop the feeding, and ensure that there is no plastic inside the main runner 11. The temperature of the temperature control box is lowered by the temperature control button, which lowers the temperature inside the hot runner circuit 7, cooling and molding the workpiece inside the upper mold 3 and the lower mold 4. After a period of time, the upper mold plate 1 and the upper mold 3 are moved by the injection molding machine to open the mold. The workpiece is pushed out by the ejector plate 15, the internal workpiece is removed, the mold is closed again, and the next workpiece is processed.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations may be made to these embodiments without departing from the principles and spirit, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hot runner injection mold for a power battery cover plastic part, comprising an upper mold portion and a lower mold portion, wherein the upper mold portion comprises, from top to bottom, an upper template (1), an upper mold fixing plate (2), and an upper mold (3), and the lower mold portion comprises a lower mold (4), a lower mold fixing plate (5), and a lower template (6), characterized in that: A hot runner plate (12) is provided below the upper mold fixing plate (2). The hot runner plate (12) is provided with multiple sets of hot runner circuits (7). The hot runner circuits (7) are connected to needle valve nozzles. The upper mold fixing plate (2) has a main channel (11) in the middle, which is connected to the hot runner circuit (7). The upper mold plate (1) has a cylinder (13) inside, and the output shaft of the cylinder (13) is connected to the needle valve. The hot runner plate (12) has a solenoid valve signal junction box (9) on one side, which is electrically connected to the cylinder (13). The upper mold fixing plate (2) has a hot runner junction box (10) on one side, which is electrically connected to the hot runner circuit (7). The lower mold fixing plate (5) has an ejector plate (15) at the bottom.

2. The hot runner injection mold for a power battery cover plastic part according to claim 1, characterized in that: The upper mold (3) is provided with several relief grooves, and the needle valve nozzle passes through the relief grooves and communicates with the injection mold cavity.

3. The hot runner injection mold for a power battery cover plastic part according to claim 1, characterized in that: The hot runner circuit (7) is electrically connected to the temperature control box via the hot runner junction box (10), and the temperature control box is used to adjust the temperature of the hot runner circuit (7).

4. The hot runner injection mold for a power battery cover plastic part according to claim 1, characterized in that: The solenoid valve signal junction box (9) is connected to the cylinder (13) via a cylinder control button.

5. The hot runner injection mold for a power battery cover plastic part according to claim 1, characterized in that: The upper mold fixing plate (2) is also provided with a control panel on one side. The control panel is provided with a temperature control button and a cylinder control button, which are used to control the heating of the hot runner circuit (7) and the action of the cylinder (13) respectively.

6. The hot runner injection mold for a power battery cover plastic part according to claim 1, characterized in that: The upper template (1) and the lower template (6) are installed on the injection molding machine via a positioning ring (8).

7. The hot runner injection mold for a power battery cover plastic part according to claim 1, characterized in that: The ejector plate (15) is fixedly connected to the lower template (6).

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