Sprue structure of injection mold

Abstract

The utility model relates to the field of mold sprues, and discloses a sprue structure of an injection mold, which comprises a lower mold, the lower mold is fixed on the top surface of a placing plate, an upper mold is arranged above the lower mold, the top surface of the upper mold is provided with a pouring gate, the inner wall of the pouring gate is provided with a sprue bush in a clamping manner, and the sprue bush is provided with a sprue. A fixed seat is arranged on the top surface of the upper mold, a plurality of flexible plates are fixed on the top surface of the fixed seat, external threads are arranged on the outer walls of the flexible plates, threaded sleeves are in threaded connection with the outer walls of the flexible plates, and a plurality of threaded grooves are formed in the top surface of the upper mold. According to the utility model, the threaded sleeve is matched with the flexible plate, so that stable connection can be provided after the injection molding head is mounted, the injection molding head of an injection molding machine can be accurately fixed at the position of the pouring gate, and the stable connection can prevent the injection molding head from shaking or displacing in the injection molding process; the structure can ensure the stability of the injection molding head at the pouring gate.

Description

Technical Field

[0001] The utility model relates to the technical field of mold gates, in particular to a gate structure of an injection mold. Background Art

[0002] Injection molding involves injecting molten plastic into a mold cavity of the desired shape. After holding the pressure and cooling to solidify, the mold is opened and the solidified plastic is ejected to produce a finished product. Injection molding is widely used in plastic parts manufacturing due to its low cost, short cycle times, simple molding process, and ease of forming complex plastic products.

[0003] The Chinese patent with announcement number CN221271870U is a side gate injection mold, including a mold body and a side gate. The side gate is opened on the outside of the upper mold cover of the mold body, and the mold body also includes a pressing and cutting mechanism. The pressing and cutting mechanism includes a vertical cutting groove, a spring, a support plate, a V-shaped groove, a continuous pouring groove, a V-shaped bar, a vertical connecting plate, an L-shaped bracket, a vibration motor, a load-bearing plate, and a rodless cylinder.

[0004] In the above scheme, a cutting structure is provided between the cavity of the mold body and the side gate to improve the efficiency of the operation and demolding at the side gate injection mold. However, it has the following disadvantages: no structure for fixing the injection head is provided at the gate of this injection mold, resulting in the injection head shaking and falling off due to the injection pressure during the injection molding process, resulting in uneven injection of the plastic melt, thereby reducing the quality of the injection molded product. Utility Model Content

[0005] The purpose of the utility model is to provide a gate structure of an injection mold to solve the problem that the injection mold gate is not provided with a structure for fixing the injection head, resulting in the injection head shaking and falling off due to the injection pressure during the injection molding process, thereby causing uneven injection of the plastic melt.

[0006] In order to achieve the above-mentioned purpose of the utility model, the utility model adopts the following technical solutions: a gate structure of an injection mold, including a lower mold, the lower mold is fixed on the top surface of a placement plate, an upper mold is arranged above the lower mold, the top surface of the upper mold is provided with a pouring port, the inner wall of the pouring port is clamped with a gate sleeve, the top surface of the upper mold is provided with a fixed seat, the top surface of the fixed seat is fixed with several flexible plates, the outer wall of the flexible plate is provided with an external thread, the outer wall of the flexible plate is threadedly connected with a threaded sleeve, the top surface of the upper mold is provided with several threaded grooves, the top surface of the fixed seat is provided with several positioning holes, the inner wall of the positioning hole is slidably connected with a fixing bolt, the fixing bolt is threadedly connected to the thread groove, and the fixing bolt can facilitate the staff to install and disassemble the fixed seat, so that the staff can easily disassemble and clean the fixed seat.

[0007] Preferably, a one-way valve is fixed to the inner wall of the pouring port, which can also help maintain the pressure inside the cavity stable during the injection molding process. When the injection pressure of the injection molding machine fluctuates, the one-way valve can prevent the plastic melt in the cavity from flowing backwards, thereby maintaining the pressure inside the cavity.

[0008] Preferably, two mounting plates are fixed on the top surface of the placement plate, a sliding hole is provided on the mounting plate, a mounting groove is provided on the inner bottom surface of the sliding hole, a driving motor is fixed on the inner wall of the mounting groove, a sliding block is threadedly connected to the outer wall of the driving motor, the sliding block is slidably connected to the sliding hole, and the sliding block is fixed to one side of the upper mold. The driving motor can accurately control the moving speed and position of the upper mold, thereby accurately controlling the clamping force. Appropriate clamping force is very important for ensuring the quality of plastic products to ensure the quality of the products.

[0009] Preferably, limiting holes are provided at the four corners of the top surface of the upper mold, and limiting columns are fixed at the four corners of the top surface of the lower mold. The limiting columns are slidably connected to the limiting holes. The cooperation between the limiting columns and the limiting holes can also limit the moving range of the upper mold to prevent the upper mold from being over-pressed and damaging the lower mold.

[0010] Preferably, a placement groove is opened on the rear side of the lower mold, and a cooling module is fixed on the inner wall of the placement groove. Appropriate cooling speed and uniform cooling have a great influence on the quality of plastic products. The cooling module can make all parts of the plastic product cool evenly and reduce warping and deformation through reasonable cooling channel design.

[0011] Preferably, a snap-in groove is provided on the top surface of the lower mold, and a snap-in frame is fixed on the bottom surface of the upper mold. The snap-in frame is snap-connected to the snap-in groove. During the injection molding process, the mold body will be subjected to the pressure of the plastic melt. The snap-in structure can enhance the connection stability between the upper mold and the lower mold, prevent the upper mold from shifting under the action of pressure, and thus ensure the integrity of the mold body structure.

[0012] Preferably, a sealing ring is fixed to the bottom surface of the clamping frame, and the sealing ring can ensure the stability of the pressure inside the cavity. Stable cavity pressure is crucial to the quality of plastic products.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The combination of the threaded sleeve and the flexible plate provides a stable connection after the injection head is installed, allowing the injection head of the injection molding machine to be accurately fixed at the sprue position. The stable connection prevents the injection head from shaking or shifting during the injection molding process. For example, when injecting high-pressure, high-viscosity plastic materials, an unstable injection head may cause uneven injection of the plastic melt. This structure ensures the stability of the injection head at the sprue and guarantees the quality of the injection molding. At the same time, the combination of the threaded sleeve and the flexible plate can adapt to injection heads of different sizes. The flexible plate can accurately fix injection heads of different sizes at the sprue position by adjusting the threaded sleeve, thereby improving the versatility of the entire sprue structure. The one-way valve can prevent the plastic melt in the mold cavity from flowing back into the barrel of the injection molding machine when the injection molding machine stops injecting, thereby avoiding color mixing or component imbalance affecting product quality.

[0015] Second, by driving the upper mold up and down with a drive motor, the opening and closing of the mold body can be automated, which helps improve production efficiency and reduce the workload and errors of manual operation. The upper mold can be guided by the cooperation of the limit column and the limit hole, ensuring that the upper mold moves in the predetermined direction when moving up and down, preventing the upper mold from shifting, thereby ensuring that the upper mold can accurately match the lower mold every time the mold is closed, improving production stability and product consistency. The cooling module can quickly remove the heat of the plastic, shortening the molding cycle, allowing the plastic to reach the demolding temperature in a shorter time, and improving production efficiency;

[0016] Third, the upper and lower molds can be accurately positioned by the coupling frame and coupling groove. During the assembly of the mold body, this coupling structure ensures the relative position of the upper and lower molds is accurate, preventing problems such as flash or uneven wall thickness caused by misalignment. The sealing ring can improve the sealing between the lower and upper molds. During injection molding, the upper and lower molds will be under certain pressure. Under the action of pressure, the plastic melt may seep out from the joint gap between the upper and lower molds, thus effectively preventing the plastic melt from leaking during the injection molding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0018] Figure 2 It is an explosion diagram of the utility model;

[0019] Figure 3 for Figure 2 A in the middle is an enlarged schematic diagram;

[0020] Figure 4 for Figure 2 Enlarged schematic diagram of point B in the middle.

[0021] In the figure: 1. Lower mold; 2. Placement plate; 3. Upper mold; 4. Casting gate; 5. Gate sleeve; 6. Fixed seat; 7. Flexible plate; 8. Threaded sleeve; 9. Threaded groove; 10. Positioning hole; 11. Fixing bolt; 12. One-way valve; 13. Mounting plate; 14. Sliding hole; 15. Mounting groove; 16. Drive motor; 17. Sliding block; 18. Limiting hole; 19. Limiting column; 20. Placement groove; 21. Cooling module; 22. Snap-in groove; 23. Snap-in frame; 24. Sealing ring. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] like Figure 1-Figure 4 As shown, a gate structure of an injection mold includes a lower mold 1, which is fixed on the top surface of a placement plate 2. An upper mold 3 is arranged above the lower mold 1, and a pouring port 4 is provided on the top surface of the upper mold 3. A pouring port 4 is provided, and a gate sleeve 5 is provided on the inner wall of the pouring port 4. A fixing seat 6 is provided on the top surface of the upper mold 3, and a plurality of flexible plates 7 are fixed on the top surface of the fixing seat 6. The outer wall of the flexible plate 7 is provided with an external thread, and the outer wall of the flexible plate 7 is threadedly connected with a threaded sleeve 8. The top surface of the upper mold 3 is provided with a plurality of thread grooves 9, and the top surface of the fixing seat 6 is provided with a plurality of positioning holes 10. The inner wall of the positioning hole 10 is slidably connected with a fixing bolt 11, and the fixing bolt 11 is threadedly connected to the thread groove 9. A one-way valve 12 is fixed to the inner wall of the pouring port 4.

[0024] During use, the cooperation between the threaded sleeve 8 and the flexible plate 7 can provide a stable connection after the injection head is installed, and the injection head of the injection molding machine can be accurately fixed at the position of the pouring port 4. The stable connection can prevent the injection head from shaking or displacing during the injection molding process. For example, when injecting high-pressure, high-viscosity plastic materials, if the injection head is unstable, it may cause uneven injection of the plastic melt. This structure can ensure the stability of the injection head at the pouring port 4 and ensure the injection quality. At the same time, the cooperation between the threaded sleeve 8 and the flexible plate 7 can adapt to injection heads of different sizes. The flexible plate 7 can accurately fix injection heads of different sizes at the position of the pouring port 4 through the adjustment of the threaded sleeve 8, thereby improving the versatility of the entire pouring port structure. The one-way valve 12 can prevent the plastic melt in the cavity from flowing back into the barrel of the injection molding machine when the injection molding machine stops injecting, thereby avoiding color mixing or component imbalance affecting the quality of the product. At the same time, the one-way valve 12 can also help maintain the pressure inside the cavity stable during the injection molding process. When the injection pressure of the injection molding machine fluctuates, the one-way valve 12 can prevent the plastic melt in the cavity from flowing back, thereby maintaining the pressure inside the cavity.

[0025] like Figure 1-Figure 4 As shown, two mounting plates 13 are fixed to the top surface of the placement plate 2, a sliding hole 14 is provided on the mounting plate 13, a mounting groove 15 is provided on the inner bottom surface of the sliding hole 14, a driving motor 16 is fixed to the inner wall of the mounting groove 15, a sliding block 17 is threadedly connected to the outer wall of the driving motor 16, the sliding block 17 is slidably connected to the sliding hole 14, the sliding block 17 is fixed to one side of the upper mold 3, limiting holes 18 are provided at the four corners of the top surface of the upper mold 3, and limiting columns 19 are fixed at the four corners of the top surface of the lower mold 1, and the limiting columns 19 are slidably connected to the limiting holes 18.

[0026] During use, the upper mold 3 is driven up and down by the drive motor 16 to realize the automation of the opening and closing of the mold body, which helps to improve production efficiency and reduce the workload and errors of manual operation. At the same time, the drive motor 16 can accurately control the movement speed and position of the upper mold 3, thereby accurately controlling the clamping force. The appropriate clamping force is very important for ensuring the quality of plastic products to ensure the quality of the products. The cooperation of the limit column 19 and the limit hole 18 can guide the upper mold 3, ensuring that the upper mold 3 moves in a predetermined direction when moving up and down, preventing the upper mold 3 from deviating, thereby ensuring that the upper mold 3 can accurately cooperate with the lower mold 1 each time the mold is closed, improving production stability and product consistency. At the same time, the cooperation of the limit column 19 and the limit hole 18 can also limit the movement range of the upper mold 3, preventing the upper mold 3 from being over-pressed and damaging the lower mold 1.

[0027] like Figure 1-Figure 4As shown, a placement groove 20 is provided on the rear side of the lower mold 1, a cooling module 21 is fixed to the inner wall of the placement groove 20, a snap-in groove 22 is provided on the top surface of the lower mold 1, and a snap-in frame 23 is fixed to the bottom surface of the upper mold 3, and the snap-in frame 23 is snap-connected to the snap-in groove 22.

[0028] During use, the cooling module 21 can quickly remove the heat of the plastic, shorten the molding cycle, and enable the plastic to reach the demolding temperature in a shorter time, thereby improving production efficiency. At the same time, appropriate cooling speed and uniform cooling have a great impact on the quality of plastic products. The cooling module 21 can achieve uniform cooling of various parts of the plastic product through reasonable cooling channel design, thereby reducing warping and deformation. The upper mold 3 and the lower mold 1 can be accurately positioned by cooperating with the clamping frame 23 and the clamping groove 22. During the assembly process of the mold body, this clamping structure can ensure that the relative positions of the upper mold 3 and the lower mold 1 are accurate, and prevent problems such as flash or uneven wall thickness caused by misalignment. At the same time, during the injection molding process, the mold body will be subjected to the pressure of the plastic melt. The clamping structure can enhance the connection stability between the upper mold 3 and the lower mold 1, and prevent the upper mold 3 from shifting under the action of pressure, thereby ensuring the integrity of the mold body structure.

[0029] like Figure 1-Figure 4 As shown, a sealing ring 24 is fixed to the bottom surface of the clamping frame 23 .

[0030] During use, the sealing ring 24 can improve the sealing between the lower mold 1 and the upper mold 3. During injection molding, the upper mold 3 and the lower mold 1 will be under a certain pressure. Under the action of pressure, the plastic melt may seep out from the joint gap between the upper mold 3 and the lower mold 1, thereby effectively preventing the plastic melt from leaking during the injection molding process. At the same time, the sealing ring 24 can ensure the stability of the pressure inside the cavity. Stable cavity pressure is crucial to the quality of plastic products.

[0031] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A gate structure of an injection mold, comprising a lower mold (1), wherein the lower mold (1) is fixed on the top surface of a placement plate (2), and is characterized in that: An upper mold (3) is provided above the lower mold (1), a pouring port (4) is provided on the top surface of the upper mold (3), a pouring port (4) is provided on the inner wall of the pouring port (4) and a pouring port sleeve (5) is provided in a clamping manner, a fixing seat (6) is provided on the top surface of the upper mold (3), a plurality of flexible plates (7) are fixed on the top surface of the fixing seat (6), an outer wall of the flexible plate (7) is provided with an external thread, and the outer wall of the flexible plate (7) is threadedly connected to a threaded sleeve (8), a plurality of thread grooves (9) are provided on the top surface of the upper mold (3), a plurality of positioning holes (10) are provided on the top surface of the fixing seat (6), a fixing bolt (11) is slidably connected to the inner wall of the positioning hole (10), and the fixing bolt (11) is threadedly connected to the thread groove (9).

2. The gate structure of an injection mold according to claim 1, characterized in that: A one-way valve (12) is fixed to the inner wall of the pouring port (4).

3. The gate structure of an injection mold according to claim 1, characterized in that: Two mounting plates (13) are fixed on the top surface of the placement plate (2), a sliding hole (14) is provided on the mounting plate (13), a mounting groove (15) is provided on the inner bottom surface of the sliding hole (14), a driving motor (16) is fixed on the inner wall of the mounting groove (15), a sliding block (17) is threadedly connected to the outer wall of the driving motor (16), the sliding block (17) is slidably connected to the sliding hole (14), and the sliding block (17) is fixed to one side of the upper mold (3).

4. The gate structure of an injection mold according to claim 3, characterized in that: Limiting holes (18) are provided at the four corners of the top surface of the upper mold (3), and limiting columns (19) are fixed at the four corners of the top surface of the lower mold (1), and the limiting columns (19) are slidably connected to the limiting holes (18).

5. The gate structure of an injection mold according to claim 1, characterized in that: A placement groove (20) is provided on the rear side of the lower mold (1), and a cooling module (21) is fixed to the inner wall of the placement groove (20).

6. The gate structure of an injection mold according to claim 5, characterized in that: A clamping groove (22) is provided on the top surface of the lower mold (1), and a clamping frame (23) is fixed on the bottom surface of the upper mold (3), wherein the clamping frame (23) is clamped to the clamping groove (22).

7. The gate structure of an injection mold according to claim 6, characterized in that: A sealing ring (24) is fixed to the bottom surface of the clamping frame (23).

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