An injection mold for donuts and an injection molding method thereof

Abstract

This invention discloses an injection mold and injection method for donuts in the field of donut processing. It includes an upper mold plate, a forming upper mold below the upper mold plate, and a forming lower mold below the forming upper mold. The invention utilizes an opening and closing device between the movable square iron and the forming upper mold, and a limiting pull stud between the movable square iron and the forming lower mold. After mold opening, the movable square iron can be pulled out by the opening and closing device, causing the core fixed ring to detach from the core moving ring. After being pulled a certain distance, the movable square iron is detached from the forming upper mold and positioned in the middle, greatly facilitating product removal and improving injection molding efficiency. By using the cooperation of the core fixed ring and the core moving ring, the assembly of the annular space inside the donut is achieved. After mold opening, the core fixed ring can be elastically pulled out of the donut, allowing for single-injection molding of the donut. This solves the problem that existing mold factories cannot produce a hollow circle and cannot pull out the mold.

Description

Technical Field

[0001] This invention relates to the field of donut processing, specifically to an injection mold and injection method for donuts. Background Technology

[0002] Existing donut injection molds allow the outer ring to be pulled out, but the inner ring cannot, as it is a closed circle. Current injection mold manufacturers can only cut the donut in half and then glue it back together. During the gluing process, water, slime, or glitter are added, etc. Since the contents are glued inside the donut, the contents leak out, resulting in poor adhesion. Furthermore, after mold opening, the donuts are mostly directly inside the mold cavity, making removal inconvenient and significantly reducing production efficiency. Therefore, those skilled in the art provide an injection mold and injection method for donuts to solve the problems mentioned in the background art. Summary of the Invention

[0003] The purpose of this invention is to provide an injection mold and injection method for donuts to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] An injection mold and injection method for making donuts include an upper mold plate, a forming upper mold disposed below the upper mold plate, a forming lower mold disposed below the forming upper mold, support plates disposed on both sides below the lower mold, an mounting plate disposed below the support plates, a movable square iron disposed at the opening of the side wall adjacent to the forming upper mold and the forming lower mold, square iron guide sleeves disposed in the holes opened at the top center and on both sides of the movable square iron, and square iron guide posts disposed on the lower mold at positions opposite to the square iron guide sleeves. On the lower forming mold, limit rivets are movably installed on both sides of the square iron guide post located in the middle. The limit rivets are threadedly connected to the movable square iron. The upper forming mold and the lower forming mold both have donut forming cavities. A core moving ring is provided on one side wall of the movable square iron. An open positioning sleeve is provided around the contact part between the core moving ring and the movable square iron. A core fixed ring is provided inside the donut forming cavity on the lower forming mold. The core fixed ring and the core moving ring are combined to form a ring structure.

[0006] As a further embodiment of the present invention: both ends of the lower forming mold are fixedly connected to mold opening guide posts, and each of the lower forming molds is provided with a mold opening guide sleeve that cooperates with the mold opening guide posts. The mold opening guide sleeve is interference-fitted with the upper forming mold, and the upper forming mold and the lower forming mold are slidably connected through the mold opening guide posts and the mold opening guide sleeve.

[0007] As a further aspect of the present invention: a fixing countersunk hole is provided on the movable square iron on one side of the core moving ring, and a moving ring fixing screw is provided inside the fixing countersunk hole, and the core moving ring and the movable square iron are fixed by the moving ring fixing screw.

[0008] As a further aspect of the present invention: the inner hole of the opening positioning sleeve is a waist-shaped structure, and the part of the core ring located in the waist-shaped inner hole of the opening positioning sleeve is a waist-shaped column that cooperates with the limiting of the opening positioning sleeve.

[0009] As a further aspect of the present invention: the movable square iron and the forming lower mold are slidably connected by the square iron guide post and the square iron guide sleeve, and a screw avoidance hole is provided on the mounting plate at the bottom end of the limiting pull stud.

[0010] As a further embodiment of the present invention: the upper forming mold is connected to the upper template by screws, the lower forming mold is connected to the support plate by screws, the support plate is connected to the mounting plate by screws, and the mounting plate and the support plate form an L-shaped structure.

[0011] As a further aspect of the present invention: a donut body is integrally formed in the donut forming cavity between the upper forming mold and the lower forming mold, located around the moving ring and the fixed ring of the core, and injection holes are provided on the opposite side walls of the upper forming mold and the lower forming mold.

[0012] As a further embodiment of the present invention: an opening and closing device is provided on one side of the square iron guide sleeve below the upper forming mold, and an opening and closing hole is provided on one end of the moving square iron at the opening and closing device to fit tightly with the opening and closing device.

[0013] As a further aspect of the present invention: the opening and closing device is a nylon rubber stopper, the opening and closing device is connected to the upper forming mold by screws, and there is a 0.1-0.2mm interference allowance between the opening and closing device and the opening and closing hole on the movable square iron.

[0014] An injection mold for making donuts and an injection molding method thereof, comprising the following steps:

[0015] S101. When using this mold, first fix the upper template and mounting plate on this mold to the injection molding machine with screws. After connecting the injection port, start closing the mold. After closing the mold, the moving ring and the fixed ring of the core close into a complete circle. A donut hollow ring is formed in the donut forming cavity between the upper molding mold and the lower molding mold, located outside the moving ring and the fixed ring of the core.

[0016] S102. Inject the raw material into the hollow donut ring formed in step S101 to achieve injection molding of the donut;

[0017] S103. During mold opening, the upper forming mold is locked on the machine. An opening and closing device is installed between the movable square iron and the upper forming mold. The movable square iron is pulled on the upper forming mold by the opening and closing device. The lower forming mold will continue to be dragged along the mold opening direction of the injection molding machine. The core ring is fixed on the lower forming mold. As the lower forming mold moves away, the core ring will disengage from the core moving ring. After being pulled away to a certain distance, the limit pin fixed on the square iron will hit the lower forming mold. The lower forming mold will then pull the movable square iron strongly. The force is much greater than that of the opening and closing device between the movable square iron and the upper forming mold. It will pull the movable square iron away from the upper forming mold. When the lower forming mold slides to the limit position of the injection molding machine, the movable square iron has disengaged from the upper forming mold and is in the middle position, which is convenient for product removal.

[0018] S104. Repeat this process to achieve batch injection molding of donut products.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. An opening and closing device is installed between the movable square iron and the upper forming mold, and a limiting pull pin is set between the movable square iron and the lower forming mold. After the mold is opened, the movable square iron can be pulled out by the opening and closing device. The core fixed ring will disengage from the core moving ring. After being pulled out a certain distance, the limiting pull pin fixed on the square iron will hit the lower forming mold. The lower forming mold will then forcefully pull the movable square iron. The movable square iron has disengaged from the upper forming mold and is in the middle position, which can greatly facilitate the removal of the product and thus improve the efficiency of injection molding.

[0021] 2. This invention achieves the assembly of the annular space inside the donut by setting a fixed ring and a moving ring of the core. After the mold is opened, the fixed ring of the core is elastically pulled out from the donut, which can realize the molding of the donut in one injection molding. This solves the problem that existing mold factories cannot make this hollow circle and cannot pull out the mold. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is an exploded view of the present invention;

[0024] Figure 3 This is a rear exploded view of the present invention;

[0025] Figure 4 This is an exploded view from below of the present invention.

[0026] In the diagram: 1. Upper mold plate; 2. Upper forming mold; 3. Lower forming mold; 4. Support plate; 5. Mounting plate; 6. Movable square iron; 7. Injection hole; 8. Fixed countersunk hole; 9. Moving ring fixing screw; 10. Mold opening guide post; 11. Mold opening guide sleeve; 12. Opening and closing device; 13. Square iron guide post; 14. Limiting rivet; 15. Square iron guide sleeve; 16. Opening positioning sleeve; 17. Donut forming mold cavity; 18. Core moving ring; 19. Core fixed ring; 20. Donut body; 21. Screw clearance hole. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figures 1-4 In this embodiment of the invention, an injection mold and injection method for making donuts include an upper mold plate 1, a forming upper mold 2 disposed below the upper mold plate 1, a forming lower mold 3 disposed below the forming upper mold 2, support plates 4 disposed on both sides below the forming lower mold 3, an mounting plate 5 disposed below the support plates 4, a movable square iron 6 disposed at the opening of the side wall adjacent to the forming upper mold 2 and the forming lower mold 3, and square iron guide sleeves 15 disposed in the holes opened at the top center and on both sides of the movable square iron 6, and square iron guides disposed on the forming lower mold 3 at positions opposite to the square iron guide sleeves 15. On the column 13, the square iron guide column 13 located in the middle of the lower forming mold 3 is provided with limiting rivets 14 on both sides. The limiting rivets 14 are connected to the movable square iron 6 by threads. The upper forming mold 2 and the lower forming mold 3 are both provided with donut forming cavities 17. A core moving ring 18 is provided on one side wall of the movable square iron 6. An open positioning sleeve 16 is provided around the contact part between the core moving ring 18 and the movable square iron 6. A core fixed ring 19 is provided inside the donut forming cavity on the lower forming mold 3. The core fixed ring 19 and the core moving ring 18 are combined to form a ring structure.

[0029] By adopting the above technical solution, with an opening and closing device 12 installed between the movable square iron 6 and the upper molding die 2, and a limiting pull pin 14 set between the movable square iron 6 and the lower molding die 3, the movable square iron 6 can be pulled out by the opening and closing device 12 after the mold is opened. The core fixed ring 19 will then disengage from the core moving ring 18. After being pulled apart by a certain distance, the limiting pull pin 14 fixed on the square iron will strike the lower molding die 3. The lower molding die 3 will then forcefully pull the movable square iron 6. The movable square iron 6 has disengaged from the upper molding die 2 and is in the middle position, which greatly facilitates product removal and improves injection molding efficiency.

[0030] In this embodiment, mold opening guide posts 10 are fixedly connected to both ends of the upper part of the lower forming mold 3. Each of the lower forming mold 3 is provided with a mold opening guide sleeve 11 that cooperates with the mold opening guide post 10. The mold opening guide sleeve 11 is interference-connected with the upper forming mold 2. The upper forming mold 2 and the lower forming mold 3 are slidably connected through the mold opening guide post 10 and the mold opening guide sleeve 11, which can provide positioning guidance for the movement of the movable square iron 6 and ensure repeatability positioning accuracy.

[0031] In this embodiment, a fixing countersunk hole 8 is provided on the movable square iron 6 on one side of the core moving ring 18. A moving ring fixing screw 9 is provided inside the fixing countersunk hole 8. The core moving ring 18 and the movable square iron 6 are fixed by the moving ring fixing screw 9, which can realize the fixed installation of the core moving ring 18.

[0032] In this embodiment, the inner hole of the opening positioning sleeve 16 is a waist-shaped structure, and the part of the core ring 19 located in the waist-shaped inner hole of the opening positioning sleeve 16 is a waist-shaped post that cooperates with the opening positioning sleeve 16 for limiting installation, which can realize the limiting installation of the opening positioning sleeve 16.

[0033] In this embodiment, the movable square iron 6 and the forming lower mold 3 are slidably connected by the square iron guide post 13 and the square iron guide sleeve 15. The mounting plate 5 is provided with a screw avoidance hole 21 at the bottom end of the limiting pull stud 14, which can achieve reasonable avoidance of the limiting pull stud 14.

[0034] In this embodiment, the upper forming mold 2 is connected to the upper template 1 by screws, the lower forming mold 3 is connected to the support plate 4 by screws, the support plate 4 is connected to the mounting plate 5 by screws, and the mounting plate 5 and the support plate 4 form an L-shaped structure.

[0035] In this embodiment, a donut body 20 is integrally formed in the donut forming cavity 17 between the upper forming mold 2 and the lower forming mold 3, located around the core moving ring 18 and the core fixed ring 19. Injection holes 7 are provided on the opposite side walls of the upper forming mold 2 and the lower forming mold 3.

[0036] By adopting the above technical solution, the assembly of the annular space inside the donut is achieved by setting the core fixed ring 19 and the core moving ring 18 in cooperation. After the mold is opened, the core fixed ring 19 is elastically pulled out of the donut, which can realize the donut being formed by injection molding in one go. This solves the problem that existing mold factories cannot make this hollow circle and cannot pull out the mold.

[0037] In this embodiment, an opening and closing device 12 is provided on one side of the square iron guide sleeve 15 below the upper forming mold 2. An opening and closing hole is provided on one end of the opening and closing device 12 on the movable square iron 6 to fit tightly with the opening and closing device 12, so that the movable square iron 6 can be pulled to move with the upper forming mold 2.

[0038] In this embodiment, the opening and closing device 12 is a nylon rubber stopper. The opening and closing device 12 is connected to the upper forming mold 2 by screws. There is a 0.1-0.2mm interference allowance between the opening and closing device 12 and the opening and closing hole on the movable square iron 6.

[0039] An injection mold for making donuts and an injection molding method thereof, comprising the following steps:

[0040] S101. When using this mold, first fix the upper template 1 and mounting plate 5 on the mold to the injection molding machine with screws. After connecting the injection port, start closing the mold. After closing the mold, the core moving ring 18 and core fixed ring 19 close to form a complete ring. A donut hollow ring is formed in the donut forming cavity 17 between the upper mold 2 and the lower mold 3, located around the core moving ring 18 and core fixed ring 19.

[0041] S102. Inject the raw material into the hollow ring of the donut formed in step S101 to achieve injection molding of the donut;

[0042] S103. When the mold is opened, the upper mold 2 is locked on the machine. An opening and closing device 12 is installed between the movable square iron 6 and the upper mold 2. The movable square iron 6 is pulled on the upper mold 2 by the opening and closing device 12. The lower mold 3 will continue to be dragged along the mold opening direction of the injection molding machine. The core ring 19 is fixed on the lower mold 3. As the lower mold 3 moves away, the core ring 19 will disengage from the core moving ring 18. After being pulled away by a certain distance, the limiting pull pin 14 fixed on the square iron will hit the lower mold 3. The lower mold 3 will then pull the movable square iron 6 strongly. The force is much greater than that of the opening and closing device 12 between the movable square iron 6 and the upper mold 2. The movable square iron 6 will be pulled away from the upper mold 2. When the lower mold 3 slides to the limit position of the injection molding machine, the movable square iron 6 has disengaged from the upper mold 2 and is in the middle position, which is convenient for product removal.

[0043] S104. Repeat this process to achieve batch injection molding of donut products.

[0044] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An injection mold for donuts, comprising an upper mold plate (1), characterized in that: A forming upper mold (2) is provided below the upper template (1), and a forming lower mold (3) is provided below the forming upper mold (2). Support plates (4) are provided on both sides below the forming lower mold (3), and mounting plates (5) are provided below the support plates (4). Movable square iron (6) is provided at the opening of the side wall adjacent to the forming upper mold (2) and the forming lower mold (3). Square iron guide sleeves (15) are provided in the holes opened in the middle and on both sides of the upper part of the movable square iron (6). Square iron guide posts (13) are provided on the forming lower mold (3) at positions opposite to the square iron guide sleeves (15). The square iron guide post (13) located in the middle of the forming lower mold (3) is provided. Limiting rivets (14) are movably provided on both sides of the iron guide post (13). The limiting rivets (14) are connected to the movable square iron (6) by threads. The upper forming mold (2) and the lower forming mold (3) are both provided with donut forming cavities (17). A core moving ring (18) is provided on one side wall of the movable square iron (6). An opening positioning sleeve (16) is provided around the contact part between the core moving ring (18) and the movable square iron (6). A core fixed ring (19) is provided inside the donut forming cavity on the lower forming mold (3). The core fixed ring (19) and the core moving ring (18) are combined to form a ring structure. The upper forming mold (2) is provided with an opening and closing device (12) on one side of the square iron guide sleeve (15), and the movable square iron (6) is provided with an opening and closing hole at one end of the opening and closing device (12) to be tightened and fitted with the opening and closing device (12).

2. The injection mold for donuts according to claim 1, characterized in that: The lower molding die (3) is fixedly connected to two ends of the upper part of the mold opening guide post (10). The lower molding die (3) is provided with a mold opening guide sleeve (11) that cooperates with the mold opening guide post (10). The mold opening guide sleeve (11) is interference connected to the upper molding die (2). The upper molding die (2) and the lower molding die (3) are slidably connected through the mold opening guide post (10) and the mold opening guide sleeve (11).

3. The injection mold for donuts according to claim 2, characterized in that: A fixed countersunk hole (8) is provided on the movable square iron (6) on one side of the core moving ring (18). A moving ring fixing screw (9) is provided inside the fixed countersunk hole (8). The core moving ring (18) and the movable square iron (6) are fixed by the moving ring fixing screw (9).

4. The injection mold for donuts according to claim 3, characterized in that: The inner hole of the opening positioning sleeve (16) is a waist-shaped structure, and the part of the core ring (19) located in the waist-shaped inner hole of the opening positioning sleeve (16) is a waist-shaped column that is matched with the opening positioning sleeve (16) for limiting.

5. The injection mold for donuts according to claim 4, characterized in that: The movable square iron (6) and the forming lower mold (3) are slidably connected by the square iron guide post (13) and the square iron guide sleeve (15). The mounting plate (5) is provided with a screw avoidance hole (21) at the bottom end of the limiting pull stud (14).

6. The injection mold for donuts according to claim 5, characterized in that: The upper forming mold (2) is connected to the upper template (1) by screws, the lower forming mold (3) is connected to the support plate (4) by screws, the support plate (4) is connected to the mounting plate (5) by screws, and the mounting plate (5) and the support plate (4) form an L-shaped structure.

7. The injection mold for donuts according to claim 6, characterized in that: The donut body (20) is integrally formed in the donut forming cavity (17) between the upper forming mold (2) and the lower forming mold (3) around the core moving ring (18) and the core fixed ring (19). The upper forming mold (2) and the lower forming mold (3) are provided with injection holes (7) on their opposite side walls.

8. The injection mold for donuts according to claim 7, characterized in that: The opening and closing device (12) is a nylon rubber stopper. The opening and closing device (12) is connected to the upper forming mold (2) by screws. There is a 0.1-0.2mm interference allowance between the opening and closing device (12) and the opening and closing hole on the movable square iron (6).

9. An injection molding method for donuts, applied to an injection mold for donuts as described in any one of claims 1-8, characterized in that: Includes the following steps: S101. When using this mold, first fix the upper template (1) and mounting plate (5) on this mold to the injection molding machine with screws. After connecting the injection port, start closing the mold. After closing the mold, the core moving ring (18) and core fixed ring (19) close into a complete ring. A donut hollow ring is formed in the donut forming cavity (17) between the upper forming mold (2) and the lower forming mold (3) around the core moving ring (18) and core fixed ring (19). S102. Inject the raw material into the hollow donut ring formed in step S101 to achieve injection molding of the donut; S103. When the mold is opened, the upper molding mold (2) is locked on the machine. An opening and closing device (12) is installed between the movable square iron (6) and the upper molding mold (2). The movable square iron (6) is pulled on the upper molding mold (2) by the opening and closing device (12). The lower molding mold (3) will continue to be dragged along the mold opening direction of the injection molding machine. The core ring (19) is fixed on the lower molding mold (3). In this way, as the lower molding mold (3) moves away, the core ring (19) will disengage from the core moving ring (18). After being pulled away by a certain distance, the limiting pull pin (14) fixed on the square iron will hit the lower molding mold (3). When the lower mold (3) pulls the movable square iron (6) forcefully, the force is much greater than the opening and closing device (12) between the movable square iron (6) and the upper mold (2). It will pull the movable square iron (6) away from the upper mold (2). When the lower mold (3) slides to the limit position of the injection molding machine, the movable square iron (6) has been separated from the upper mold (2) and is in the middle position, which makes it convenient to take out the product. S104. Repeat this process to achieve batch injection molding of donut products.

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