Injection mold with secondary ejection mechanism

Abstract

The utility model relates to the technical field of injection molds, and discloses an injection mold with a secondary ejection mechanism, which comprises an outer shell and an ejector plate, an ejector plate base plate, a first base plate and a secondary ejection collision block are sequentially and additionally arranged at the bottom of the ejector plate, and a secondary ejection elastic block is additionally arranged in the center of the outer side of the first base plate; a rear mold core is additionally arranged at the bottom of the ejector plate, and rear mold inserts are connected to the periphery of the top of the rear mold core. According to the injection mold with the secondary ejection mechanism, the ejector pin plate, the ejector pin plate base plate and the first base plate are driven by the ejector rod to move upwards, the secondary ejection elastic block is installed on the first base plate and moves upwards along with the first base plate to drive the flat ejector pin and the ejector pin to move upwards, meanwhile, the ejector plate and the rear mold core move upwards together, and a product is separated from the rear mold insert; the secondary ejection elastic block is in contact with the secondary ejection collision block, the ejector pin continuously ejects the ejector pin plate, the ejector pin plate base plate drives the ejector pin to move upwards, and the product is ejected out of the rear mold core.

Description

Technical Field

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

[0002] Injection molds are essential tools for producing plastic products and are widely used in modern manufacturing. They inject molten plastic into a mold, pressurizing and cooling it to form the desired product shape. They typically consist of a mold base, mold core, mold cavity, cooling system, and discharge system. These components work together to ensure the plastic is properly formed, cooled, and solidified in the mold, ultimately producing the desired product. High-quality cold-work tool steel, hot-work tool steel, and alloy tool steel are widely used in injection molds.

[0003] A common injection mold typically consists of a mold base, mold core, mold cavity, cooling system, and discharge system. Molten plastic is first pumped into the mold, filling the entire mold cavity. Simultaneously, the mold's cooling system begins to absorb heat from the mold, rapidly cooling and solidifying the plastic. Once the plastic has fully solidified, the mold separates, and the molded product is ejected through the discharge system.

[0004] In traditional injection molds, the ejection structure is mostly realized by a one-time ejection action of a single ejection mechanism. However, for products with a large ejection stroke, a single ejection action needs to exert a large ejection force on the product during ejection, which can easily cause product defects. In addition, due to the special shape of some injection mold finished products, or for the needs of mass production, if the finished product is still in the mold cavity after one ejection, or cannot fall off automatically, it is necessary to add another ejection action. However, this method not only leads to product defects, but also cannot guarantee product quality and there is a risk of product breakage or deformation, making a single ejection mechanism unsuitable for occasions with high production automation requirements. For this reason, an injection mold with a secondary ejection mechanism is proposed. Utility Model Content

[0005] (1) Technical problems solved

[0006] In response to the shortcomings of the existing technology, the present invention provides an injection mold with a secondary ejection mechanism to solve the above-mentioned technical problems that not only may product defects occur, but also product quality cannot be guaranteed and there are risks of product breakage or deformation, making the ejection mechanism unsuitable for occasions with high production automation requirements.

[0007] (2) Technical solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solution: an injection mold with a secondary ejection mechanism, comprising:

[0009] An outer shell, and an ejector plate arranged in the lower part of the inner cavity of the outer shell, and an ejector plate pad is added to the bottom of the ejector plate, and a first pad is provided at the bottom of the ejector plate pad, and a secondary ejection block is added to the outer center of the ejector plate pad, a secondary ejection spring block is added to the outer center of the first pad, and a limiting screw is connected between the secondary ejection spring block and the first pad;

[0010] An ejector plate is provided at the upper center of the outer shell, and return rods are provided around the top of the ejector plate, and a second fixing screw is connected between the ejector plate and the return rods. A rear mold core is provided on the top of the ejector plate, and a third fixing screw is connected between the ejector plate and the rear mold core;

[0011] The rear mold insert is set around the top of the rear mold core, and an ejector is added to the center of the inner cavity of the rear mold insert, and flat ejectors are connected to the outer sides of the rear mold insert. By installing the injection mold on the injection molding machine, after the mold is closed, the injection molding machine injects the raw materials and cools them under pressure to form them. The injection molding machine drives the movable mold part to move to open the mold, and the front and rear molds are separated. The ejection system of the injection molding machine is running, and the ejector rod drives the ejector plate, the ejector plate pad, and the first pad to move upward. The secondary ejector spring is installed on the first pad and moves upward with the first pad, driving the flat ejector and the ejector to move upward. At the same time, the ejector plate and the rear mold core move upward together to eject the product from the rear mold insert. After moving upward, the secondary ejector spring collides with the secondary ejector. The ejector plate and the ejector plate backing plate contact the first backing plate, driving the ejector upward. The first backing plate remains unchanged, and the ejector ejects the product from the rear mold core, completing the final demolding. The injection molding machine drives the ejector rod backward, pulling the ejector plate and the ejector plate backing plate to drive the ejector backward. The ejector plate backing plate continues to move backward until it contacts the first backing plate and then moves backward together, driving the ejector plate and the rear mold core backward together. The injection molding machine then drives the entire movable mold forward, closing the front and rear molds, and the injection molding machine injects the raw material. This movement is then repeated. This not only avoids product defects but also ensures product quality. By dispersing the ejection force, the risk of product breakage or deformation can be reduced, especially in applications where production automation is required.

[0012] Preferably, a secondary ejection hook is provided on the lower outer side of the secondary ejection block, a heat shield is provided on the top of the outer shell, a fixed mold panel is connected to the outer periphery of the heat shield, and a fixed mold plate is provided around the bottom periphery of the heat shield. The secondary ejection block and the secondary ejection hook enable secondary ejection, and the heat shield provides a heat insulation effect.

[0013] Preferably, the bottom of the ejector plate is provided with a movable platen, and a second backing plate is provided at the bottom of the movable platen. Mold legs are mounted on the front and back of the bottom of the second backing plate, and the bottom of the mold legs is connected to the movable mold faceplate. The ejector plate is used to eject the formed product. The movable mold plate supports and transmits force during the opening and closing of the mold. The second backing plate increases the load-bearing area and disperses pressure. The mold legs are used for fixing and supporting, and the movable mold faceplate supports the formed part of the mold.

[0014] Preferably, dust shields are attached to the outsides of the mold legs, straight water spouts are installed on the front and back of the fixed mold plate, and elbow water spouts are connected to the front and back of the second pad. The straight water spouts can be directly connected to the mold waterway or the injection molding machine waterway, while the elbow water spouts can ensure smooth and efficient waterway connection when the mold waterway needs to be curved.

[0015] Preferably, a counter is installed on the back of the fixed template, and a counter collision block is added to the bottom of the counter, and a first precision positioning is installed around the bottom of the fixed template, a standing foot is added to the outside of the fixed template, and a locking die is added to the outside of the counter, a front mold core is provided at the bottom center of the fixed template, and a first fixing screw is added around the bottom of the front mold core, and a support plate is installed at the four corners of the bottom of the fixed template. The counter collision block is a key component for triggering counting. When it is stimulated by the outside, it will generate one or more pulse signals, which are received and counted by the counter. The fixed template plays a role in accurately positioning and fixing the workpiece in the mold. The standing foot ensures the stability and safety of the mold during operation. The locking die enhances the locking force of the mold to prevent material leakage. The front mold core presses the material in the mold downward to separate it from the mold.

[0016] Preferably, pressure springs are installed around the top of the ejector plate, and a second precision positioner is connected between the ejector plate and the movable platen. The pressure springs can maintain a certain pressure between the ejector plate and the mold, which ensures the stability and consistency of the mold during the injection molding or stamping process.

[0017] (3) Beneficial effects

[0018] Compared with the prior art, the present invention provides an injection mold with a secondary ejection mechanism, which has the following beneficial effects:

[0019] The injection mold with a secondary ejection mechanism is installed on the injection molding machine. After the mold is closed, the injection molding machine injects the raw materials and cools them under pressure to form them. The injection molding machine drives the movable mold part to move to open the mold, and the front and rear molds are separated. The injection molding machine ejection system is in operation, and the ejector rod drives the ejector plate, the ejector plate pad, and the first pad to move upward. The secondary ejection spring block is installed on the first pad and moves upward with the first pad to drive the flat ejector and the ejector to move upward. At the same time, the ejector plate and the rear mold core move upward together to eject the product from the rear mold insert. After the upward movement, the secondary ejection The spring contacts the secondary ejector block, and the ejector pin continues to push against the ejector plate and ejector plate backing plate, driving the ejector pin upward. The primary backing plate remains unchanged, and the ejector pin ejects the product from the rear mold core, completing the final demolding. The injection molding machine drives the ejector pin backward, pulling the ejector plate and ejector plate backing plate, driving the ejector pin backward. Continuing backward movement, the ejector plate backing plate contacts the primary backing plate, and then they move backward together, driving the ejector plate and rear mold core backward together. The injection molding machine then drives the entire movable mold forward, closing the front and rear molds, and the injection molding machine injects the raw material. This movement is then repeated. This not only prevents product defects but also ensures product quality. By dispersing the demoulding force, the risk of product breakage or deformation can be reduced, especially in situations where production automation requirements are high. At the same time, the use of a secondary ejection structure can make mold demoulding smoother, reduce the time of mold separation, and improve production efficiency. During the demoulding process, the secondary ejection plate can reduce the contact area between the mold and the mold base, reducing the possibility of mold damage due to adhesion. The secondary ejection structure can also reduce the impact force of the mold separating from the mold base, making the product surface quality smoother, reducing the occurrence of problems such as bubbles and scratches, and improving product quality. At the same time, the use of hot runner injection molding technology can save production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the outer shell of the utility model as viewed from the right rear side;

[0022] Figure 3 This is a schematic diagram of the bottom of the fixed template and its connection structure of the utility model;

[0023] Figure 4 This is a schematic diagram of the top of the ejector plate and its connection structure of the utility model;

[0024] Figure 5 This is a schematic diagram of the utility model pad and its connection structure;

[0025] Figure 6 This is a schematic diagram of the return rod and its connection structure of the utility model.

[0026] Figure: 1. Outer shell; 2. Ejector plate; 3. Ejector plate pad; 4. First pad; 5. Secondary ejector block; 6. Secondary ejector hook; 7. Heat shield; 8. Fixed die panel; 9. Fixed die plate; 10. Ejector plate; 11. Moving die plate; 12. Second pad; 13. Die leg; 14. Moving die panel; 15. Dust shield; 16. Straight faucet; 17. Elbow faucet; 18. Counter; 19. Counter 1. Impact block; 20. First precision positioning; 21. Standing foot; 22. Locking plate; 23. Front mold core; 24. First fixing screw; 25. Support plate; 26. Pressure spring; 27. Second precision positioning; 28. Second fixing screw; 29. Third fixing screw; 30. Flat ejector pin; 31. Ejector pin; 32. Rear mold insert; 33. Rear mold core; 34. Return rod; 35. Secondary ejector block; 36. Limit screw. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] The utility model provides a technical solution, an injection mold with a secondary ejection mechanism, comprising: Figure 1 、 Figure 6 , an outer shell 1, and an ejector plate 2 arranged at the lower part of the inner cavity of the outer shell 1, and an ejector plate pad 3 is added to the bottom of the ejector plate 2, and a first pad 4 is provided at the bottom of the ejector plate pad 3, and a secondary ejection block 5 is added to the outer center of the ejector plate pad 3, and a secondary ejection block 35 is added to the outer center of the first pad 4, and a limiting screw 36 is connected between the secondary ejection block 35 and the first pad 4;

[0029] See also Figure 4 The ejector plate 10 is arranged at the upper center of the outer shell 1, and a return rod 34 is added around the top of the ejector plate 10, and a second fixing screw 28 is connected between the ejector plate 10 and the return rod 34. A rear mold core 33 is added to the top of the ejector plate 10, and a third fixing screw 29 is connected between the ejector plate 10 and the rear mold core 33;

[0030] See also Figure 5, the rear mold insert 32 is arranged around the top of the rear mold core 33, and an ejector pin 31 is added to the center of the inner cavity of the rear mold insert 32, and flat ejector pins 30 are connected to the outer sides of the rear mold insert 32. By installing the injection mold on the injection molding machine, after the mold is closed, the injection molding machine injects the raw materials and cools them under pressure to form them. The injection molding machine drives the movable mold part to move to open the mold, and the front and rear molds are separated. The ejection system of the injection molding machine is running, and the ejector rod drives the ejector plate 2, the ejector plate pad 3, and the first pad 4 to move upward. The secondary ejector spring 35 is installed on the first pad 4 and moves upward with the first pad 4, driving the flat ejector 30 and the ejector 31 to move upward. At the same time, the ejector plate 10 and the rear mold core 33 move upward together to eject the product from the rear mold insert 32. After moving upward, the secondary ejector spring 35 collides with the secondary ejector After the ejector plate 2 and the ejector plate backing plate 3 come into contact with each other, the ejector pin 31 moves upwards. The first backing plate 4 remains unchanged, and the ejector pin 31 ejects the product from the rear mold core 33, completing the final demolding of the product. The injection molding machine drives the ejector pin backward, pulling the ejector plate 2 and the ejector plate backing plate 3 to drive the ejector pin 31 backward. The ejector plate backing plate 3 continues to move backward, and the ejector plate backing plate 3 contacts the first backing plate 4. Then, they move backward together, driving the ejector plate 10 and the rear mold core 33 backward together. The injection molding machine then drives the entire movable mold forward, closing the front and rear molds, and the injection molding machine injects the raw materials. The above movement is then repeated. This not only avoids product defects but also ensures product quality. By dispersing the demoulding force, the risk of product breakage or deformation can be reduced, especially in situations where production automation requirements are high. At the same time, the use of a secondary ejection structure can make mold demoulding smoother, reduce the time of mold separation, and improve production efficiency. During the demoulding process, the secondary ejection plate can reduce the contact area between the mold and the mold base, reducing the possibility of mold damage due to adhesion. The secondary ejection structure can also reduce the impact force of the mold separating from the mold base, making the product surface quality smoother, reducing the occurrence of problems such as bubbles and scratches, and improving product quality. At the same time, the use of hot runner injection molding technology can save production costs.

[0031] See also Figure 1A secondary ejection hook 6 is provided on the lower outer side of the secondary ejection collision block 5, and a heat insulation board 7 is provided on the top of the outer shell 1, and a fixed mold panel 8 is connected to the outer sides of the heat insulation board 7, and a fixed mold plate 9 is provided around the bottom of the heat insulation board 7. The secondary ejection action can be realized by the secondary ejection collision block 5 and the secondary ejection hook 6, and the heat insulation effect can be achieved by the heat insulation board 7. A movable mold plate 11 is provided on the bottom of the ejection plate 10, and a second pad 12 is provided on the bottom of the movable mold plate 11, and mold legs 13 are installed on the front and back of the bottom of the second pad 12, and the bottom of the mold legs 13 is connected to a movable mold panel 14. The ejection plate 10 is used to eject the molded product. The movable mold plate 11 plays a role in bearing and transmitting force during the opening and closing process of the mold. The second pad 12 increases the force-bearing area and disperses the pressure. The mold legs 13 are used for fixing and supporting, and the movable mold panel 14 carries the molding part of the mold.

[0032] See also Figure 2 The outside of the mold leg 13 is connected to a dustproof plate 15, and a straight water nozzle 16 is installed on the front and back of the fixed mold plate 9, and an elbow water nozzle 17 is connected to the front and back of the second pad 12. The straight water nozzle 16 can be directly connected to the mold water channel or the water channel of the injection molding machine, and the elbow water nozzle 17 can ensure smooth and efficient water channel connection when the mold water channel needs to be bent.

[0033] See also Figure 3 , a counter 18 is installed on the back of the fixed template 9, and a counter collision block 19 is added to the bottom of the counter 18, and a first precision positioning 20 is installed around the bottom of the fixed template 9, a standing foot 21 is added to the outside of the fixed template 9, and a locking die 22 is added to the outside of the counter 18. A front mold core 23 is set at the bottom center of the fixed template 9, and a first fixing screw 24 is added around the bottom of the front mold core 23, and a support plate 25 is installed at the four corners of the bottom of the fixed template 9. The counter collision block 19 is a key component for triggering counting. When it is subjected to external stimuli such as mechanical impact, electromagnetic signals, etc., it will generate one or more pulse signals, which are received and counted by the counter 18. The fixed template 9 plays a role in accurately positioning and fixing the workpiece in the mold. The standing foot 21 ensures the stability and safety of the mold during operation. The locking die 22 enhances the locking force of the mold to prevent material leakage. The front mold core 23 presses the material in the mold downward to separate it from the mold.

[0034] See also Figure 4 , pressure springs 26 are added around the top of the ejector plate 2, and a second precision positioning 27 is connected between the ejector plate 10 and the dynamic plate 11. The pressure spring 26 can keep a certain pressure between the ejector plate 2 and the mold, which ensures the stability and consistency of the mold during the injection or stamping process.

[0035] This solution: The injection mold is installed on the injection molding machine. After the mold is closed, the injection molding machine injects the raw materials and cools them under pressure to form them. The injection molding machine drives the movable mold part to move to open the mold, and the front and rear molds are separated. The ejection system of the injection molding machine is running, and the ejector drives the ejector plate 2, the ejector plate pad 3, and the first pad 4 to move upward. The secondary ejector spring 35 is installed on the first pad 4 and moves upward with the first pad 4, driving the flat ejector 30 and the ejector 31 to move upward. At the same time, the ejector plate 10 and the rear mold core 33 move upward together to eject the product from the rear mold insert 32. After moving upward, the secondary ejector spring 35 and the secondary ejector After the collision block 5 contacts, the ejector rod continues to push the ejector plate 2 and the ejector plate pad 3 to drive the ejector 31 to move upward, the first pad 4 remains unchanged, and the ejector 31 ejects the product from the rear mold core 33, completing the final demolding of the product; the injection molding machine drives the ejector rod to move backward, pulling the ejector plate 2 and the ejector plate pad 3 to drive the ejector 31 to move backward, and continues to move backward until the ejector plate pad 3 contacts the first pad 4, and then moves backward together, driving the ejector plate 10 and the rear mold core 33 to move backward together; then the injection molding machine drives the entire movable mold to move forward, the front and rear molds are closed, the injection molding machine injects the raw materials, and the above movements are repeated.

[0036] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although the 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 variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An injection mold with a secondary ejection mechanism, characterized in that: include: An outer shell (1), and an ejector plate (2) arranged at the lower part of the inner cavity of the outer shell (1), an ejector plate pad (3) is provided at the bottom of the ejector plate (2), a first pad (4) is provided at the bottom of the ejector plate pad (3), a secondary ejection block (5) is provided at the outer center of the ejector plate pad (3), a secondary ejection spring block (35) is provided at the outer center of the first pad (4), and a limiting screw (36) is connected between the secondary ejection spring block (35) and the first pad (4); An ejector plate (10) is arranged at the upper center of the outer shell (1), and return rods (34) are added around the top of the ejector plate (10), and a second fixing screw (28) is connected between the ejector plate (10) and the return rod (34). A rear mold core (33) is added to the top of the ejector plate (10), and a third fixing screw (29) is connected between the ejector plate (10) and the rear mold core (33); The rear mold insert (32) is arranged around the top of the rear mold core (33), and an ejector pin (31) is added to the center of the inner cavity of the rear mold insert (32), and flat ejector pins (30) are connected to the outer sides of the rear mold insert (32).

2. The injection mold with a secondary ejection mechanism according to claim 1, characterized in that: A secondary ejection hook (6) is provided on the lower outer side of the secondary ejection collision block (5), and a heat insulation board (7) is provided on the top of the outer shell (1). A fixed mold panel (8) is connected to the outer periphery of the heat insulation board (7), and a fixed mold plate (9) is provided around the bottom of the heat insulation board (7).

3. The injection mold with a secondary ejection mechanism according to claim 2, characterized in that: A movable mold plate (11) is provided at the bottom of the ejection plate (10), and a second pad (12) is provided at the bottom of the movable mold plate (11). Mold legs (13) are installed on the front and back sides of the bottom of the second pad (12), and the bottom of the mold legs (13) is connected to a movable mold panel (14).

4. The injection mold with a secondary ejection mechanism according to claim 3, characterized in that: The outer side of the mold leg (13) is connected to a dustproof plate (15), and straight water nozzles (16) are installed on the front and back of the fixed mold plate (9), and elbow water nozzles (17) are connected to the front and back of the second pad (12).

5. The injection mold with a secondary ejection mechanism according to claim 4, characterized in that: A counter (18) is installed on the back of the fixed template (9), and a counter collision block (19) is added at the bottom of the counter (18), and a first precision positioning (20) is installed around the bottom of the fixed template (9), a standing foot (21) is added on the outside of the fixed template (9), and a locking mold piece (22) is added on the outside of the counter (18), a front mold core (23) is provided at the bottom center of the fixed template (9), and a first fixing screw (24) is added around the bottom of the front mold core (23), and a support plate (25) is installed at the four corners of the bottom of the fixed template (9).

6. The injection mold with a secondary ejection mechanism according to claim 5, characterized in that: Pressure springs (26) are provided around the top of the ejector plate (2), and a second precision positioning device (27) is connected between the ejector plate (10) and the movable plate (11).

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