Secondary ejection injection mold

Abstract

The utility model discloses a secondary ejection injection mold which comprises a mold body and a mold ejection device, the mold ejection device comprises a plurality of ejector pins, an ejector pin plate group, a plurality of secondary ejection mechanisms and a bottom plate, the ejector pins are fixed on the ejector pin plate group, the upper ends of the ejector pins are positioned in a mold cavity, the ejector pin plate group is positioned on the bottom plate, one end of each secondary ejection mechanism is horizontally arranged, and the other end of each secondary ejection mechanism is horizontally arranged. One end of the secondary ejection mechanism is obliquely arranged and located below the ejector plate set, the other end of the secondary ejection mechanism is obliquely arranged and located on the two sides of the ejector plate set, the bent position of the secondary ejection mechanism is hinged to the bottom plate, boss structures are arranged on the inner sides of the two vertical plates, the oblique portion of the secondary ejection mechanism is located below the boss structures, a lifter is further arranged on the lower plate, and the upper end of the lifter is connected with the bottom plate. The secondary ejection mechanism is reasonable in structure, firstly, the ejector pin plate group and the bottom plate are driven by the lifter to move upwards together, and after the inclined part of the secondary ejection mechanism abuts against the lower end of the boss structure, the horizontal part of the secondary ejection mechanism can drive the ejector pin plate group to move upwards in an accelerated mode, so that demolding of a product is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the mould field, especially a secondary ejection injection mold. BACKGROUND

[0002] Mold is the industrial production with injection, blow molding, extrusion, die casting or forging forming, smelting, stamping and other methods to get the desired products of various molds and tools. In short, the mold is used to make the tool of the shaped object, and the tool is composed of various parts, and different molds are composed of different parts. It realizes the machining of the shape of the article mainly through the change of the physical state of the molded material.

[0003] When using the mold to produce products by injection molding, how to demold is a common problem. The product after injection molding is easy to stick to the mold, and generally needs secondary ejection to ensure the normal full-automatic production of the mold, but the previous secondary ejection structure is complex, the processing difficulty is great, and the cost is high. In view of the above problems, the following provides a solution. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a secondary ejection injection mold, which has the advantages of saving ejector plate, reducing the complexity of mold structure, and making processing simpler and more convenient.

[0005] The above technical purpose of the utility model is realized by the following technical scheme:

[0006] A secondary ejection injection mold, comprising a mold body and a mold ejecting device, the mold body comprises an upper plate, an upper module, a lower module, two vertical plates and a lower plate from top to bottom, a mold cavity is arranged between the upper module and the lower module, an installation cavity is formed between the two vertical plates, the lower plate and the lower module, the mold ejecting device is located in the installation cavity, the mold ejecting device comprises a plurality of ejector pins, an ejector plate group, a plurality of secondary ejection mechanisms and a bottom plate, the lower ends of the plurality of ejector pins are fixed on the ejector plate group, the upper ends of the ejector pins penetrate through the lower module and are located in the mold cavity, the ejector plate group is located on the bottom plate, the plurality of secondary ejection mechanisms are symmetrically distributed on both sides of the upper end surface of the bottom plate, one end of the secondary ejection mechanism is horizontally placed and located below the ejector plate group, the other end of the secondary ejection mechanism is inclinedly arranged and located on both sides of the ejector plate group, the bending part of the secondary ejection mechanism is hingedly connected with the bottom plate, the inner sides of the two vertical plates are provided with boss structures, the inclined part of the secondary ejection mechanism is located below the boss structure, a lifter is further arranged on the lower plate, the upper end of the lifter is connected with the bottom plate, and the lifter is used to lift the height of the bottom plate.

[0007] As preferred, the needle plate set comprises an upper needle plate and a lower needle plate, the upper needle plate is located above the lower needle plate, the upper end of the upper needle plate is fixed with a plurality of upper limiting columns, the plurality of upper limiting columns are used for limiting the position of upward movement of the upper needle plate, the lower needle plate is provided with a plurality of secondary ejection grooves, the horizontal part of the secondary ejection mechanism is located in the secondary ejection groove, and the secondary ejection mechanism is used for lifting the upper needle plate and the lower needle plate upward.

[0008] As preferred, the bottom plate is provided with two lower positioning columns, the lower end of the lower positioning column is fixedly connected with the lower plate, the upper end of the lower positioning column is fixedly connected with the lower end surface of the lower module, the lower sliding hole is arranged on the upper needle plate and the bottom plate, the lower sliding hole is sleeved on the lower positioning column and is in sliding connection with the lower positioning column.

[0009] As preferred, the bottom plate is further provided with four upper positioning columns, the upper needle plate is provided with four upper positioning holes at four corners, the four upper positioning columns are located in the four upper positioning holes respectively, the lower end of the four upper positioning columns abuts against the upper end surface of the lower needle plate, and the lower module is provided with four upper sliding holes, the upper end of the four upper positioning columns passes through the upper sliding hole and abuts against the lower end surface of the upper module.

[0010] As preferred, the upper positioning column is sleeved with a reset spring, the lower end of the reset spring is connected with the upper end surface of the upper needle plate, and the upper end of the reset spring is connected with the lower module, so that the reset spring is used for resetting the ejection device.

[0011] As preferred, one side of the lower plate is provided with a limit switch, one side of the bottom plate is connected with a reset block, and one end of the limit switch abuts against the lower end of the reset block.

[0012] As preferred, the reset block is provided with a long sliding hole, the long sliding hole is provided with a bolt, the bolt passes through the long sliding hole and is in threaded connection with one side of the bottom plate, and the long sliding hole is in sliding connection with the bolt.

[0013] The beneficial effects of the utility model are that: through the secondary ejection mechanism, in the process of stable upward movement, the secondary ejection mechanism exerts a thrust force on the needle plate set, so that the needle plate set accelerates upward movement, thereby realizing secondary ejection of the product and facilitating product demolding. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is a structure schematic view of the embodiment;

[0015] Fig. 2 It is a sectional structure view of the embodiment;

[0016] Fig. 3 It is a structure schematic view of the rear side of the embodiment;

[0017] Fig. 4This is a cross-sectional view of the secondary top mechanism used in the embodiment.

[0018] Reference numerals: 1. Mold body; 2. Ejector device; 3. Upper plate; 4. Upper module; 5. Lower module; 6. Vertical plate; 7. Lower plate; 8. Mold cavity; 9. Mounting cavity; 10. Ejector pin; 11. Secondary ejector mechanism; 12. Base plate; 13. Boss structure; 14. Lifter; 15. Upper ejector plate; 16. Lower ejector plate; 17. Limiting post; 18. Secondary ejector groove; 19. Lower positioning post; 20. Upper positioning post; 21. Limit switch; 22. Reset block; 23. Long sliding hole; 24. Bolt; 25. Reset spring. Detailed Implementation

[0019] The following description is merely a preferred embodiment of this utility model, and the scope of protection is not limited to this embodiment. All technical solutions falling within the scope of this utility model's concept should be protected. Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "bottom" and "top," "inner" and "outer" refer to directions toward or away from the geometric center of a specific component.

[0020] like Figs. 1 to 4 As shown, a secondary ejection injection mold includes a mold body 1 and an ejector device 2. The mold body 1 includes, from top to bottom, an upper plate 3, an upper module 4, a lower module 5, two vertical plates 6 and a lower plate 7, and a mold cavity 8 is provided between the upper module 4 and the lower module 5.

[0021] A mounting cavity 9 is formed between the two upright plates 6, the lower plate 7, and the lower module 5. The top mold device 2 is located within the mounting cavity 9, that is, below the lower module 5. The top mold device 2 includes several ejector pins 10, ejector pin plate assemblies, several secondary ejector mechanisms 11, and a base plate 12. A lifter 14 is connected to the lower end of the base plate 12. The lifter 14 is a component that can provide linear power, such as a cylinder, and its lower end face is fixedly connected to the lower plate 7. To reduce the overall volume of the mold, the lifter 14 is embedded within the lower plate 7. The output end of the lifter 14 faces vertically upward and is connected to the lower end face of the base plate 12. To increase the stability of the base plate 12 during movement, a force-equalizing plate is connected to the output shaft of the lifter 14 in this design, and the force-equalizing plate is embedded at the center of the lower end face of the base plate 12. The output shaft of the lifter 14 is also located at the center of the lower end face of the force-equalizing plate. Therefore, when the lifter 14 is activated, it can stably push the base plate 12 upward.

[0022] The ejector plate group is located on the base plate 12 and is driven to move upward by the base plate 12. The ejector plate group comprises an upper ejector plate 15 and a lower ejector plate 16, and the upper ejector plate 15 is located above the lower ejector plate 16. A plurality of through holes are formed in the upper ejector plate 15, and the lower ends of the plurality of ejector pins 10 are inserted into the through holes and are fixedly connected with the lower ejector plate 16. The through holes can increase the stability of the ejector pins 10 and prevent the ejector pins 10 from tilting. The upper ends of the ejector pins 10 penetrate through the lower mold block 5 and communicate with the mold cavity 8, and when the lower ejector plate 16 drives the ejector pins 10 to move upward, the plurality of ejector pins 10 will abut against the lower end surface of the product and push the product upward. In order to make the stress of the product uniform, the upper ends of the plurality of ejector pins 10 are also uniformly distributed in the mold cavity 8, and the positions where the product bears greater stress adopt the ejector pins 10 with larger diameters.

[0023] The base plate 12 is also provided with four upper positioning columns 20, and upper positioning holes are formed at the four corners of the upper ejector plate 15, and the four upper positioning columns 20 are located in the four upper positioning holes respectively. The lower ends of the four positioning columns abut against the upper end surface of the lower ejector plate 16, the upper ends of the four upper positioning columns 20 penetrate through the four upper sliding holes on the lower mold block 5 and abut against the upper mold block 4. When the lower ejector plate 16 moves upward, it drives the four upper positioning columns 20 to move upward, and the four upper positioning columns 20 move along the upper sliding holes to prevent deviation during movement, and the four upper positioning columns 20 push the upper mold block 4 away, so that the product can be removed from the mold cavity 8.

[0024] A reset spring 25 is sleeved on the upper positioning column 20, the lower end of the reset spring 25 is connected with the upper end surface of the upper ejector plate 15, and the upper end of the reset spring 25 is connected with the lower mold block 5. When the lifter 14 no longer provides upward thrust to the base plate 12, the reset spring 25 which is compressed will generate a downward elastic force on the upper ejector plate 15, so that the ejector plate group and the base plate 12 return to the initial position.

[0025] The four secondary ejection mechanisms 11 in the design are symmetrically arranged at positions close to the four corners of the lower ejector plate 16. The secondary ejection mechanism 11 is a bent block comprising a horizontal part and an inclined part. The lower ejector plate 16 is provided with a plurality of secondary ejection grooves 18, the horizontal part of the secondary ejection mechanism 11 is located in the secondary ejection groove 18 and between the lower ejector plate 16 and the base plate 12, the inclined part of the secondary ejection mechanism 11 is located on both sides of the lower ejector plate 16 of the ejector plate group, and the bent part of the secondary ejection mechanism 11 is hingedly connected with the base plate 12. The secondary ejection mechanism 11 functions as a lever, and when the inclined part of the secondary ejection mechanism 11 is subjected to a downward pressure, the horizontal part of the secondary ejection mechanism 11 drives the ejector plate group to move upward, thereby accelerating the movement of the ejector plate group from the original movement speed, forming the effect of secondary ejection.

[0026] The inner side of the two vertical plates 6 is provided with a boss structure 13, the inclined part of the secondary ejection mechanism 11 is located below the boss structure 13, the boss structure 13 can limit the moving distance of the inclined part of the secondary ejection mechanism 11, so that the horizontal part of the secondary ejection mechanism 11 can push the ejector pin plate group upward.

[0027] The upper end of the upper ejector pin plate 15 is fixedly provided with a plurality of upper limiting columns 17, the plurality of limiting columns 17 can prevent the upper ejector pin plate 15 from directly contacting the lower end surface of the lower module 5, and can also limit the ejection height of the ejector pin 10 to the product.

[0028] The bottom plate 12 is provided with two lower positioning columns 19, the lower end of the lower positioning column 19 is fixedly connected with the lower plate 7, and the upper end of the lower positioning column 19 is fixedly connected with the lower end surface of the lower module 5. The ejector pin plate group and the bottom plate 12 are both provided with a lower sliding hole, the lower sliding hole is sleeved on the lower positioning column 19. The lower positioning column 19 can make the bottom plate 12 and the ejector pin plate group more stable when moving, and can better realize the demolding of the product.

[0029] One side of the lower plate 7 is provided with a limit switch 21, the limit switch 21 is prior art, one side of the bottom plate 12 is connected with a reset block 22, and one end of the limit switch 21 abuts against the lower end of the reset block 22. When one end of the limit switch 21 contacts the reset block 22, it can be determined that the bottom plate 12 and the ejector pin plate group have been reset. In order to prevent the bottom plate 12 from moving downward excessively, a long sliding hole 23 is formed in the reset block 22, a bolt 24 is arranged in the long sliding hole 23, the bolt 24 passes through the long sliding hole 23 and is threadedly connected with one side of the bottom plate 12, and the long sliding hole 23 and the bolt 24 are in sliding connection. When the bottom plate 12 moves downward excessively, the bolt 24 will move along the long sliding hole 23, preventing the reset switch and the reset block 22 from being damaged, thereby protecting the mold from being damaged.

[0030] The above-described specific embodiments further specifically describe the technical problems solved by the utility model, technical solutions and beneficial effects, and it should be understood that the above-described specific embodiments are only specific embodiments of the utility model and are not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A two-stage ejection injection mold, comprising a mold body (1) and an ejector device (2), the mold body (1) comprising from top to bottom an upper plate (3), an upper mold block (4), a lower mold block (5), two vertical plates (6) and a lower plate (7), a mold cavity (8) being provided between the upper mold block (4) and the lower mold block (5), characterized in that, Two said vertical plate (6), lower plate (7) and lower module (5) form an installation cavity (9), the top die device (2) is located in the installation cavity (9), the top die device (2) includes several ejector pins (10), ejector pin plate group, several secondary ejection mechanism (11) and bottom plate (12), the lower end of several said ejector pins (10) is fixed on the ejector pin plate group, the upper end of the ejector pin (10) penetrates the lower module (5), and is located in the mold cavity (8), the ejector pin plate group is located on the bottom plate (12), several said secondary ejection mechanism (11) is symmetrically distributed on both sides of the upper end surface of the bottom plate (12), one end of the secondary ejection mechanism (11) is horizontally placed, and is located below the ejector pin plate group, the other end of the secondary ejection mechanism (11) is inclinedly arranged, and is located on both sides of the ejector pin plate group, the bending part of the secondary ejection mechanism (11) is hinged to the bottom plate (12), the inner side of two said vertical plate (6) is provided with a boss structure (13), the inclined part of the secondary ejection mechanism (11) is located below the boss structure (13), the lower plate (7) is further provided with a lifter (14), the upper end of the lifter (14) is connected with the bottom plate (12), and the lifter (14) is used to lift the height of the bottom plate (12).

2. A secondary ejection injection mold according to claim 1, characterized in that, The said ejector pin plate group includes an upper ejector pin plate (15) and a lower ejector pin plate (16), the upper ejector pin plate (15) is located above the lower ejector pin plate (16), the upper end of the upper ejector pin plate (15) is fixedly provided with a plurality of upper limiting columns (17), a plurality of said upper limiting columns (17) are used to limit the position of the upward movement of the upper ejector pin plate (15), the lower ejector pin plate (16) is provided with a plurality of secondary ejection grooves (18), the horizontal part of a plurality of said secondary ejection mechanism (11) is located in the secondary ejection groove (18), and the secondary ejection mechanism (11) is used to lift the upper ejector pin plate (15) and the lower ejector pin plate (16) upward.

3. A secondary ejection injection mold according to claim 2, characterized in that, The bottom plate (12) is provided with two lower positioning columns (19), the lower end of the lower positioning column (19) is fixedly connected with the lower plate (7), the upper end of the lower positioning column (19) is fixedly connected with the lower end surface of the lower module (5), the lower sliding hole is formed in the upper ejector pin plate (15) and the bottom plate (12), the lower sliding hole is sleeved on the lower positioning column (19), and is in sliding connection with the lower positioning column (19).

4. A secondary ejection injection mold according to claim 2, wherein The bottom plate (12) is further provided with four upper positioning columns (20), the upper ejector pin plate (15) is provided with an upper positioning hole at four corners, four said upper positioning columns (20) are located in the four upper positioning holes respectively, the lower end of the four upper positioning columns (20) abuts against the upper end surface of the lower ejector pin plate (16), the lower module (5) is provided with four upper sliding holes, the upper end of the four upper positioning columns (20) penetrates the upper sliding hole, and abuts against the lower end surface of the upper module (4).

5. A secondary ejection injection mold according to claim 4, characterized in that, The upper positioning column (20) is sleeved with a reset spring (25), the lower end of the reset spring (25) is connected with the upper end surface of the upper ejector pin plate (15), the upper end of the reset spring (25) is connected with the lower module (5), and the reset spring (25) is used to reset the top die device (2).

6. A secondary ejection injection mold according to claim 1, characterized in that, One side of the lower plate (7) is provided with a limit switch (21), one side of the bottom plate (12) is connected with a reset block (22), one end of the limit switch (21) is in abutment with the lower end of the reset block (22).

7. A secondary ejection injection mold according to claim 6, characterized in that A long sliding hole (23) is formed on the reset block (22), a bolt (24) is arranged in the long sliding hole (23), the bolt (24) passes through the long sliding hole (23) and is threadedly connected with one side of the bottom plate (12), and the long sliding hole (23) is in sliding connection with the bolt (24).

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