Secondary ejection structure in injection mold

Abstract

The utility model relates to the technical field of injection molds, in particular to a secondary ejection structure in an injection mold, which comprises a plate B, a rear mold core connected with the plate B is arranged in the plate B, a rear mold insert connected with the rear mold core is arranged in the rear mold core, and a small ejector pin bottom plate capable of moving up and down along the inside of the plate B is arranged in the plate B; a small ejector pin panel connected with the ejector pin bottom plate is arranged on the small ejector pin bottom plate, a small ejector pin capable of penetrating through the rear mold insert is arranged between the small ejector pin bottom plate and the small ejector pin panel, and the small ejector pin can move along the interior of the rear mold insert along with displacement of the small ejector pin bottom plate; a large ejector pin bottom plate capable of moving up and down is arranged on the bottom plate, a large ejector pin panel connected with the large ejector pin bottom plate is arranged on the large ejector pin bottom plate, and a large ejector pin capable of penetrating through the rear mold core is arranged between the large ejector pin bottom plate and the large ejector pin panel; and the large ejector pin can move along the interior of the rear mold core along with the displacement of the large ejector pin bottom plate.

Description

Technical Field

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

[0002] In mold design and actual manufacturing, the ejector structure is one of the most common demoulding structures. This design is used for a local secondary ejector structure in injection molds.

[0003] However, depending on factors such as product shape, structure, and holding force, after a single ejection, product shrinkage can trap the product, making it difficult to remove, necessitating an additional ejection, thus creating a secondary ejection. For products with multiple perforations, deep bone structures, and high holding force, a secondary ejection design should be considered to prevent product removal difficulties, whitening, and cracking during ejection, which can affect product qualification rates.

[0004] However, this solution has the following shortcomings:

[0005] 1. This structure must be adopted before design. If it is not used before design, adding this structure during mold modification later will require replacing a large number of mold components (square iron, center bracket, support column, etc.), which will greatly increase the cost and time of mold modification and affect product delivery.

[0006] 2. This structure requires the addition of a buckle machine, which requires high assembly skills in the early stage; the replacement and maintenance of the buckle machine in the later stage are more cumbersome;

[0007] 3. Increasing the mold thickness will increase the machine tonnage and increase production costs. Utility Model Content

[0008] (1) Technical problems solved

[0009] In view of the deficiencies in the prior art, the present invention provides a secondary ejection structure in an injection mold, which solves the problems raised in the above-mentioned background technology.

[0010] (2) Technical solution

[0011] To achieve the above objectives, the present invention is implemented through the following technical solutions: a secondary ejection structure in an injection mold, comprising a B plate, wherein the B plate is provided with a rear mold core connected to the B plate, and the rear mold core is provided with a rear mold insert connected to the rear mold core, a small ejector base plate capable of moving up and down along the interior of the B plate is provided in the B plate, a small ejector panel connected to the ejector base plate is provided on the small ejector base plate, a small ejector pin capable of penetrating the rear mold insert is provided between the small ejector base plate and the small ejector panel, and the small ejector pin can move along the interior of the rear mold insert as the small ejector base plate is displaced, a bottom plate is provided below the B plate, a large ejector base plate capable of moving up and down is provided on the bottom plate, a large ejector panel connected to the large ejector base plate is provided on the large ejector base plate, a large ejector pin capable of penetrating the rear mold core is provided between the large ejector base plate and the large ejector panel, and the large ejector pin can move along the interior of the rear mold core as the large ejector base plate is displaced.

[0012] Furthermore, the B plate is provided with a push rod that can be set in an empty sleeve with the B plate, and the push rod can push the small ejector base plate to move up and down. The large ejector base plate is provided with a slider that can move, and the slider can push the push rod to move up and down.

[0013] Furthermore, the B plate is provided with a connecting column that can pass through the small ejector base plate and the small ejector panel, and the connecting column can be used to limit and guide the up and down displacement of the small ejector base plate and the small ejector panel. The top of the ejector rod is provided with a ejector rod pull head connected to the ejector rod, and the ejector rod is connected to the small ejector base plate through the ejector rod pull head. The ejector rod is provided with a ejector rod notch, and the end of the slider is provided with a protrusion that can be embedded in the ejector rod notch.

[0014] Furthermore, the bottom plate is provided with an inclined guide column which can move into the slider and drive the slider to move, and the inclined guide column can drive the slider and the push rod to reset.

[0015] Furthermore, a first return spring connected to the ejector rod and elastically returning is provided in the groove at the bottom end of the ejector rod, and a second return spring which is set in an empty sleeve with the slider and elastically returning is provided in the large ejector pin base plate. The second return spring can be against the inclined guide column, and the slider is provided with a channel adapted to the inclined guide column.

[0016] Furthermore, the small ejector pins are evenly distributed in the rear mold insert, and the large ejector pins are distributed in the rear mold core along the periphery of the rear mold insert.

[0017] Furthermore, the upper surface of the rear mold insert is provided with a trumpet-shaped mesh.

[0018] This solution is similar to the structure of a speaker mesh mold, where the center speaker mesh requires a second ejector. The mesh area around the speaker mesh has a strong clamping force, so small ejector pins are added to the mesh area to prevent mold sticking. This design saves space, eliminates two ejector plates, and reduces mold costs.

[0019] Mould action:

[0020] 1. The small ejector plate is ejected (the slider drives the ejector rod and the small ejector panel, small ejector base plate, and small ejector). This is the first ejection.

[0021] During the first ejection, the slider drives the ejector pin. After 25mm of the first ejection, the slider detaches from the ejector pin, and the small ejector plate continues to eject. At this time, because the slider has detached from the ejector pin, the ejector pin has no power to continue ejecting, so the ejector pin stops ejecting after the first 25mm of ejection. Other large ejectors that are not within the grid range will continue to eject along with the large ejector plate, thus realizing a local secondary ejection structure.

[0022] 2. After the first 25mm of ejection, the slider disengages from the ejector pin, and the small ejector plate continues to eject. At this point, the slider is separated from the ejector pin, and the ejector pin has no power to continue ejecting, so the ejector pin stops ejecting after the first 25mm of ejection. The following action is the second ejection. At this time, the slider disengages from the ejector pin, and the large ejector plate continues to eject, achieving a partial secondary ejection.

[0023] 3. When closing the mold, the inclined guide pin enters the slider, the slider slides to the left, and the slider enters the notch of the ejector pin, so that the ejector pin and slider are reset.

[0024] Compared with the existing technology, the secondary ejection structure in the injection mold has the following advantages:

[0025] 1. This secondary ejection does not require three ejector plates, the structure takes up less space, and can reduce mold manufacturing costs.

[0026] 2. The action is stable, the force and action of the structure are very reliable, and the sequence of actions can be easily controlled without any special requirements for the opening and closing sequence of the mold, thus improving the qualified rate of the product;

[0027] 3. The structural parts are easy to process, the precision is easy to control, and the maintenance is also very convenient;

[0028] 4. The standard ejection structure can be completed by the mold opening and closing actions of the injection molding machine itself, which can save the molding cycle.

[0029] 5. The small ejector pins at the speaker mesh are shortened to prevent burning and breakage, thus reducing mold repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1This is a schematic diagram of the structure of the utility model;

[0031] Figure 2 For this utility model Figure 1 Schematic diagram of the ejection structure in ;

[0032] Figure 3 For this utility model Figure 1 A in the figure shows the enlarged structural diagram;

[0033] Figure 4 This is a schematic diagram of the structure of the ejector rod of the utility model;

[0034] Figure 5 This is a schematic diagram of the structure of the oblique guide column of the utility model;

[0035] Figure 6 This is a schematic diagram of the structure of the slider of the utility model;

[0036] Figure 7 This is a schematic diagram of the structure of the push rod pull head of the utility model.

[0037] In the figure: 1. rear mold insert; 2. small ejector panel; 3. small ejector base plate; 4. ejector pin; 5. large ejector panel; 6. large ejector base plate; 7. base plate; 8. rear mold core; 9. small ejector; 10. B plate; 11. slider; 12. large ejector; 13. connecting column; 14. ejector pin pull head; 15. ejector pin notch; 16. protrusion; 17. inclined guide pin; 18. first return spring; 19. second return spring; 20. channel. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] See also Figures 1 to 7The utility model provides a technical solution: a secondary ejection structure in an injection mold, comprising a B plate 10, a rear mold core 8 connected to the B plate 10 is provided in the B plate 10, a rear mold insert 1 connected to the rear mold core 8 is provided in the rear mold core 8, a small ejector base plate 3 capable of moving up and down along the interior of the B plate 10 is provided in the B plate 10, a small ejector panel 2 connected to the ejector base plate 3 is provided on the small ejector base plate 3, a small ejector 9 capable of passing through the rear mold insert 1 is provided between the small ejector base plate 3 and the small ejector panel 2, and the small ejector 9 can move along the interior of the rear mold insert 1 as the small ejector base plate 3 moves. Movement, a bottom plate 7 is provided under the B plate 10, and a large ejector bottom plate 6 that can be displaced up and down is provided on the bottom plate 7, and a large ejector panel 5 connected to the large ejector bottom plate 6 is provided on the large ejector bottom plate 6. A large ejector 12 that can penetrate the rear mold core 8 is provided between the large ejector bottom plate 6 and the large ejector panel 5. A ejector rod 4 that can be set in an empty sleeve with the B plate 10 is provided in the B plate 10. The ejector rod 4 can push the small ejector bottom plate 3 to move up and down, and a slider 11 that can be displaced is provided in the large ejector bottom plate 6. The bottom plate 7 is provided with an inclined guide column 17 that can move into the slider 11 and can drive the slider 11 to move. The inclined guide column 17 can drive the slider 11 and the ejector rod 4 to reset. The groove at the bottom end of the ejector rod 4 is provided with a first return spring 18 connected to the ejector rod 4 and elastically returning. The large ejector base plate 6 is provided with a second return spring 19 that is set in an empty sleeve with the slider 11 and elastically returning. The second return spring 19 can resist the inclined guide column 17. The slider 11 is provided with a channel 20 adapted to the inclined guide column 17. The slider 11 can push the ejector rod 4 to move up and down. The large ejector pin 12 can move along the inside of the rear mold core 8 with the displacement of the large ejector base plate 6. The B plate 10 is provided with a small ejector base plate that can penetrate 3 and the connecting column 13 of the small ejector panel 2, the connecting column 13 can be used to limit and guide the up and down displacement of the small ejector base plate 3 and the small ejector panel 2, the top of the ejector rod 4 is provided with a ejector pull head 14 connected to the ejector rod 4, the ejector rod 4 is connected to the small ejector base plate 3 through the ejector pull head 14, the ejector rod 4 is provided with an ejector notch 15, the end of the slider 11 is provided with a protrusion 16 that can be embedded in the ejector notch 15, the small ejectors 9 are evenly distributed in the rear mold insert 1, the large ejectors 12 are distributed along the periphery of the rear mold insert 1 in the rear mold core 8, and the upper surface of the rear mold insert 1 is provided with a trumpet-shaped mesh.

[0040] The electrical components mentioned in this article are all connected to an external main controller and 380V commercial power, and the main controller can be a conventional known device that performs control such as a computer.

[0041] In the description of this specification, the terms "connect", "install", "fix", "set", etc. are understood in a broad sense. For example, "connection" can be a fixed connection or an indirect connection through an intermediate component without affecting the relationship between components and the technical effect. It can also be an integral connection or a partial connection. As in this example, for ordinary technicians in this field, the specific meanings of the above terms in this utility model or utility model can be understood according to specific circumstances.

[0042] 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 secondary ejection structure in an injection mold, comprising a B plate (10), wherein the B plate (10) is provided with a rear mold core (8) connected to the B plate (10), characterized in that: The rear mold core (8) is provided with a rear mold insert (1) connected to the rear mold core (8), the B plate (10) is provided with a small ejector base plate (3) that can move up and down along the inside of the B plate (10), the small ejector base plate (3) is provided with a small ejector panel (2) connected to the ejector base plate (3), a small ejector (9) that can pass through the rear mold insert (1) is provided between the small ejector base plate (3) and the small ejector panel (2), and the small ejector (9) can move along the rear mold insert (1) as the small ejector base plate (3) moves. 1), a bottom plate (7) is provided below the B plate (10), a large ejector base plate (6) capable of moving up and down is provided on the bottom plate (7), a large ejector panel (5) connected to the large ejector base plate (6) is provided on the large ejector base plate (6), a large ejector (12) capable of penetrating the rear mold core (8) is provided between the large ejector base plate (6) and the large ejector panel (5), and the large ejector (12) can move along the interior of the rear mold core (8) as the large ejector base plate (6) is displaced.

2. The secondary ejection structure in the injection mold according to claim 1, characterized in that: The B plate (10) is provided with a push rod (4) that can be set in an empty sleeve with the B plate (10), and the push rod (4) can push the small push pin base plate (3) to move up and down. The large push pin base plate (6) is provided with a sliding block (11) that can move, and the sliding block (11) can push the push rod (4) to move up and down.

3. The secondary ejection structure in the injection mold according to claim 2, characterized in that: The B plate (10) is provided with a connecting column (13) that can pass through the small ejector base plate (3) and the small ejector panel (2), and the connecting column (13) can be used to limit and guide the up and down displacement of the small ejector base plate (3) and the small ejector panel (2). The top of the ejector rod (4) is provided with an ejector rod pull head (14) connected to the ejector rod (4), and the ejector rod (4) is connected to the small ejector base plate (3) through the ejector rod pull head (14). The ejector rod (4) is provided with an ejector rod notch (15), and the end of the slider (11) is provided with a protrusion (16) that can be embedded in the ejector rod notch (15).

4. The secondary ejection structure in the injection mold according to claim 3, characterized in that: The bottom plate (7) is provided with an inclined guide column (17) which can move into the slider (11) and drive the slider (11) to move. The inclined guide column (17) can drive the slider (11) and the push rod (4) to reset.

5. The secondary ejection structure in the injection mold according to claim 4, characterized in that: A first return spring (18) connected to the push rod (4) and elastically returning is provided in the groove at the bottom end of the push rod (4); a second return spring (19) which is loosely arranged with the slider (11) and elastically returning is provided in the large push pin base plate (6); the second return spring (19) can abut against the inclined guide column (17); and a channel (20) adapted to the inclined guide column (17) is provided in the slider (11).

6. The secondary ejection structure in the injection mold according to claim 1, characterized in that: The small ejector pins (9) are evenly distributed in the rear mold insert (1), and the large ejector pins (12) are distributed in the rear mold core (8) along the periphery of the rear mold insert (1).

7. The secondary ejection structure in the injection mold according to claim 1, characterized in that: The upper surface of the rear mold insert (1) is provided with a trumpet-shaped mesh.

Images