A row position thimble structure of an injection-molded bending product

Abstract

The utility model relates to the technical fields of injection mold, especially to a kind of line position thimble structure of injection bending product, including the upper die assembly and lower die assembly of opposite arrangement, wherein lower die assembly is equipped with lower die, and upper die assembly is equipped with upper die, and upper die and lower die are matched with each other, form the die structure with injection cavity, line position assembly is also equipped in the side of die structure, and line position assembly is used for the bending part of injection molding product, and thimble assembly is equipped in line position assembly, and thimble assembly is used for the ejection operation of the bending part of product when demolding. Above all, the line position thimble structure of the utility model, prevent product from being dragged by thimble and slider cooperation, special angle design adapts complex bending structure, wedge tight inclined plane guarantees forming accuracy, thimble spring realizes automatic reset, effectively solve traditional technical problem, improve product quality and production efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of injection molds, and in particular to a sliding ejector pin structure for injection-molded bending products. Background Technology

[0002] In the field of injection molding, numerous technical challenges arise when injection-molded products have bends. For injection-molded products with bends, especially those with undercuts (i.e., reverse protrusions in the bend requiring special demolding methods), the conventional approach is to use a side sliding mechanism (also known as a slider structure) to achieve the injection molding operation. However, for oblique bends with angles greater than 90 degrees, the traditional slider structure reveals significant limitations.

[0003] From the perspective of demolding operations, traditional slider structures are extremely inconvenient when dealing with such obliquely bent products due to the mismatch between their movement direction and the product structure. On the one hand, it is difficult to find a suitable point of leverage during demolding, making it difficult for the product to be smoothly ejected from the mold; on the other hand, during the demolding process, the relative movement between the slider and the product can easily cause dragging damage to the parting surface of the product, affecting the appearance quality and dimensional accuracy of the product, thus increasing the defect rate.

[0004] In existing technologies, while continuous attempts have been made to improve the ejector pin structure to address the forming problem of bent sections in injection-molded products, effective solutions are still lacking for complex bends with special angles or undercuts. For example, some conventional slide block designs can only meet simple lateral core-pulling requirements and cannot handle the forming and demolding of products with oblique bends and undercuts. Although some improved slide block structures have optimized the movement to a certain extent, they still cannot achieve ideal results in preventing product dragging and ensuring forming accuracy. Therefore, developing a new type of ejector pin structure for injection-molded bent products to overcome the shortcomings of traditional technologies has become an urgent problem to be solved in this field. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0006] This utility model provides a sliding ejector structure for injection-molded bending products, including an upper mold assembly and a lower mold assembly arranged opposite to each other. The lower mold assembly is provided with a lower mold core, and the upper mold assembly is provided with an upper mold core. The upper mold core and the lower mold core cooperate with each other to form a mold core structure with an injection cavity. A sliding assembly is also provided on the side of the mold core structure. The sliding assembly is used to injection mold the bending part of the product. An ejector assembly is provided inside the sliding assembly. The ejector assembly is used to eject the bending part of the product during demolding.

[0007] Furthermore: the sliding assembly includes a sliding slider, a slider seat, a sliding shovel base, and a sliding pressure strip. The sliding pressure strip is fixed to the lower mold assembly. The slider seat is slidably connected to the lower mold assembly through the sliding pressure strip. The sliding slider is fixed to the slider seat. The sliding shovel base is fixed to the upper mold assembly and is provided with an inclined guide post. The slider seat is provided with an inclined guide hole corresponding to the position of the inclined guide post, so that the inclined guide post passes through the inclined guide hole and guides the slider seat obliquely.

[0008] Furthermore: the end of the sliding pressure bar away from the sliding slider is tilted at a certain angle towards the downward mold assembly to form an oblique slide rail, so that the slider seat moves obliquely along the oblique slide rail.

[0009] Furthermore: the end of the ejector pin assembly away from the slide block is tilted at a certain angle towards the mold assembly, and the slide block has an ejector pin hole corresponding to the part of the ejector pin assembly, so that the ejector pin assembly passes through the ejector pin hole and moves obliquely.

[0010] Furthermore: the slider seat is provided with an auxiliary countersunk hole, an auxiliary rod is inserted through the auxiliary countersunk hole, and the ejector pin assembly is provided with an oblique ejector pin, one end of which is inserted through the ejector pin hole, and the other end extends into the auxiliary countersunk hole for a certain length and abuts against the auxiliary rod.

[0011] Furthermore: the end of the auxiliary rod away from the oblique ejector pin passes through the auxiliary countersunk hole and extends a certain length to form an abutment with the bottom of the limiting groove of the sliding shovel base.

[0012] Furthermore, the ejector assembly is also equipped with an ejector spring, which is sleeved on the oblique ejector pin. One end of the ejector spring abuts against the sliding block, and the other end abuts against the oblique ejector pin.

[0013] Furthermore, the sliding shovel base is also provided with a wedge-tightening inclined surface, which abuts against the end of the slider seat away from the sliding slider.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. Effectively prevents product dragging: This invention incorporates an ejector pin assembly within the slider that works in conjunction with the slider. During demolding, the angled ejector pins in the assembly support the bent portion of the product, keeping it stationary within the injection cavity, while the slider of the sliding component retracts outwards. This unique design effectively ejects the bent portion, avoiding direct friction between the slider and the bent portion during demolding, thus effectively preventing the slider from dragging the product. This significantly improves the product's appearance quality and surface finish, and reduces the defect rate.

[0016] 2. Adapting to the molding and demolding of special bending structures: For the special inclined structure of the bent part of injection molded products, this utility model sets the slider seat and slider of the sliding component to be inclined at a certain angle, forming an oblique sliding, and always keeping the movement direction of the slider perpendicular to the bent part of the product. This design allows the mold to accurately inject and mold the bent part of the product, and at the same time, during demolding, the oblique ejector pin is kept perpendicular to the bent part of the product for ejection, ensuring the smooth demolding of products with complex bending parts, and solving the problem that traditional technology is difficult to deal with special bending structures.

[0017] 3. Improved Injection Molding Accuracy: The wedge-shaped inclined surface of the slide block base presses against the slide block seat during mold closing, preventing displacement between the slide block seat and the slide block due to melt pressure during injection, and ensuring precise positioning of the slide block seat during mold closing. This allows the mold to stably maintain the shape and size of the cavity during injection molding, thereby improving the molding accuracy of the bent parts and ensuring the consistency and stability of product quality. 4. Automatic Reset Function: After the slide block base drives the slide block seat to complete the demolding operation of the bent part, the ejector spring in the ejector pin assembly drives the inclined ejector pin to move away from the bent part when the end of the auxiliary rod that abuts against the limiting groove leaves the limiting groove and loses its limiting function. Simultaneously, it moves the auxiliary rod synchronously, restoring both the auxiliary rod and the inclined ejector pin to their initial state before mold opening, ready for the next mold closing operation. This automatic reset function simplifies the mold operation process, improves production efficiency, and reduces the cost and error probability of manual intervention.

[0018] In summary, the sliding ejector pin structure of this utility model prevents product damage through the cooperation of the ejector pin and the slider, adapts to complex bending structures with a special angle design, ensures molding accuracy with a wedge-tight inclined surface, and achieves automatic reset with an ejector pin spring. It effectively solves traditional technical problems and improves product quality and production efficiency.

[0019] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2This is a schematic diagram of the structure of the sliding block and ejector pin assembly of this utility model;

[0023] Figure 3 This is a schematic diagram of the auxiliary rod and the oblique ejector pin of this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the sliding pressure strip and the oblique protrusion of this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the sliding shovel base and the limiting groove of this utility model;

[0026] Figure 6 This is a structural schematic diagram of the demolded state of this utility model.

[0027] The reference numerals and names in the figure are as follows:

[0028] 10 Lower mold assembly; 11 Lower mold core; 20 Slide assembly; 21 Slide pressure bar; 22 Slide slider; 23 Ejector pin through hole; 30 Slide seat; 31 Angled protrusion; 32 Angled guide hole; 33 Auxiliary countersunk hole; 34 Auxiliary rod; 40 Slide spade base; 41 Wedge-tightening inclined surface; 42 Limiting groove; 43 Angled guide post; 50 Ejector pin assembly; 51 Angled ejector pin; 52 Ejector pin spring. Detailed Implementation

[0029] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] Please see Figures 1 to 6 In this embodiment of the present invention, a sliding ejector structure for an injection-molded bending product includes an upper mold assembly and a lower mold assembly 10 arranged opposite to each other. The lower mold assembly 10 is provided with a lower mold core 11, and the upper mold assembly is provided with an upper mold core. The upper mold core and the lower mold core 11 cooperate with each other to form a mold core structure with an injection cavity. A sliding assembly 20 is also provided on the side of the mold core structure. The sliding assembly 20 is used to injection mold the bending part 61 of the product. An ejector assembly 50 is provided inside the sliding assembly 20. The ejector assembly 50 is used to eject the bending part 61 of the product during demolding.

[0031] Specifically, in the injection molding process, when the injection-molded product has a bent portion 61, a side sliding structure is usually required for injection molding. However, when the bent portion 61 has an undercut, a slider is required for injection molding. An undercut refers to the reverse protrusion structure of the bent portion 61, requiring a special demolding method. For oblique bends with an angle greater than 90 degrees, traditional slider structures are inconvenient for demolding. Furthermore, slider structures can easily cause scratches on the parting surface of the product during demolding, thus necessitating research and development improvements.

[0032] This invention was developed based on the actual situation of the product's bent portion 61. An ejector pin, which cooperates with the slider, is installed inside the slider to support the bent portion 61 during demolding, maintaining its position within the injection cavity. Meanwhile, the slider of the sliding assembly 20 retracts outward, effectively ejecting the bent portion 61 and preventing the slider from damaging the product. The ejector pin assembly 50 includes an angled ejector pin 51 and an ejector pin spring 52, allowing the angled ejector pin 51 to return to its original position under the action of the ejector pin spring 52.

[0033] like Figures 1 to 3 As shown, preferably, the sliding assembly 20 includes a sliding slider 22, a slider seat 30, a sliding shovel base 40, and a sliding pressure strip 21. The sliding pressure strip 21 is fixedly connected to the lower mold assembly 10. The slider seat 30 is slidably connected to the lower mold assembly 10 through the sliding pressure strip 21. The sliding slider 22 is fixedly connected to the slider seat 30. The sliding shovel base 40 is fixedly connected to the upper mold assembly and is provided with an inclined guide post 43. The slider seat 30 is provided with an inclined guide hole 32 corresponding to the position of the inclined guide post 43, so that the inclined guide post 43 passes into the inclined guide hole 32 and guides the slider seat 30 obliquely.

[0034] Specifically, to injection mold the bent portion 61 of the product, a sliding block 22 is preferably provided, with one end having a molding surface for molding the corresponding bent portion 61 of the product, and the other end fixed to a block seat 30. The block seat 30 drives the sliding block 22 to perform demolding or mold closing operations. The block seat 30 can form a sliding connection with the lower mold assembly 10 through the cooperation of the sliding pressure strip 21 and the lower mold assembly 10. An inclined guide hole 32 is provided in the block seat 30, and the inclined guide post 43 fixed on the sliding base 40 guides the inclined guide hole 32, thereby driving the block seat 30 to perform mold closing or demolding operations.

[0035] Secondly, the sliding shovel base 40 is preferably fixed to the upper template of the upper mold assembly in the prior art by bolts, so that when the mold is opened or closed, the upper template can drive the sliding shovel base 40 to move along the mold opening and closing direction.

[0036] like Figure 2 , Figure 3 and Figure 6As shown, preferably, the end of the sliding pressure bar 21 away from the sliding slider 22 is tilted at a certain angle towards the downward mold assembly 10 to form an oblique slide rail, so that the slider seat 30 moves obliquely along the oblique slide rail.

[0037] Specifically, due to the special inclined structure of the bent portion 61 of the injection molded product, a slider is required for inclined injection molding. In order to facilitate molding and demolding, preferably, the slider seat 30 and the sliding slider 22 are set to be inclined at a certain angle to form an inclined sliding, thereby forming a perpendicular state with the bent portion 61 of the product, which facilitates molding and demolding operations.

[0038] Secondly, at the position of the slider seat 30 corresponding to the position pressure bar 21, there is also an inclined protrusion 31, so that the inclined protrusion 31 cooperates with the inclined slide rail of the position pressure bar 21 to form an inclined sliding connection, so that the slider seat 30 moves obliquely along the inclined slide rail under the drive of the inclined guide post 43, and realizes the exit movement perpendicular to the direction of the bending part 61.

[0039] like Figure 2 , Figure 3 and Figure 6 As shown, preferably, the end of the ejector pin assembly 50 away from the slide block 22 is inclined at a certain angle towards the mold assembly 10. The slide block 22 has an ejector pin hole 23 at the part corresponding to the ejector pin assembly 50, so that the ejector pin assembly 50 passes through the ejector pin hole 23 and moves obliquely.

[0040] Specifically, to ensure that the ejector pin assembly 50 can also be ejected perpendicularly to the product bending portion 61, it is preferable that the ejector pin assembly 50 is also configured to move obliquely. That is, the ejector pin holes 23 opened in the sliding block are all set to be parallel to the oblique movement direction of the slider seat 30, so that when the ejector pin assembly 50 moves in the ejector pin holes 23, its movement trajectory is also parallel to the movement direction of the slider seat 30. In other words, the axis of the ejector pin holes 23 is parallel to the oblique movement trajectory of the slider seat 30, ensuring that the ejector pin assembly 50 moves obliquely synchronously.

[0041] Secondly, the tilt angles of the sliding block 21 and the ejector assembly 50 are equal, and both are equal to the sum of the angle between the product bending portion 61 and the mold opening / closing direction and 90°. This ensures that the movement direction of the sliding block 22 is always perpendicular to the product bending portion 61, guaranteeing correct injection molding and demolding of the bending portion 61. The tilt angles of the sliding block 21 and the ejector assembly 50 are both α, where α = β + 90° (β is the angle between the product bending portion 61 and the mold opening / closing direction).

[0042] like Figure 2 , Figure 3 and Figure 4As shown, preferably, the slider seat 30 is provided with an auxiliary countersunk hole 33, and an auxiliary rod 34 is inserted through the auxiliary countersunk hole 33. The ejector pin assembly 50 is provided with an oblique ejector pin 51, one end of which is inserted through the ejector pin through hole 23, and the other end extends into the auxiliary countersunk hole 33 for a certain length and abuts against the auxiliary rod 34.

[0043] Specifically, in order for the angled ejector pin 51 to eject the bent portion 61 of the product, preferably, one end of the angled ejector pin 51 passes through the ejector pin hole 23 and mates with the molding surface of the slide block 22 to form an injection cavity, thus molding the bent portion 61 during mold closing. The other end of the angled ejector pin 51 extends into the auxiliary countersunk hole 33 and abuts against the auxiliary rod 34, thereby limiting the angled ejector pin 51 so that its position relative to the injection cavity remains unchanged during demolding. As the slide block 22 retracts outward, it is equivalent to ejecting the bent portion 61 of the product.

[0044] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, preferably, the end of the auxiliary rod 34 away from the oblique ejector pin 51 passes through the auxiliary countersunk hole 33 and extends a certain length to form an abutment with the bottom of the limiting groove 42 of the sliding shovel base 40.

[0045] Specifically, in order to keep the angled ejector pin 51 continuously abutting the bent portion 61 of the product, preferably, one end of the auxiliary rod 34 abuts against the angled ejector pin 51, and the other end abuts against the limiting groove 42 of the sliding shovel base 40. This way, when the sliding shovel base 40 drives the slider seat 30 and the sliding slider 22 to move away from the bent portion 61, the auxiliary rod 34 holds the angled ejector pin 51 in place and keeps it stationary, which is equivalent to supporting the bent portion 61 of the product to remain stationary and avoiding damage to the molding surface of the product.

[0046] Secondly, during demolding, the auxiliary rod 34 constrains the inclined ejector pin 51 through the limiting groove 42, maintaining its supporting force on the bent part 61 of the product. As the sliding block 22 retracts with the slide block seat 30, the bent part 61 separates from the slide block, achieving frictionless demolding and effectively protecting the quality of the molded surface. In other words, during demolding, the sliding block 22 retracts with the slide block seat 30, while the ejector pin assembly 50, limited by the auxiliary rod 34, maintains support for the bent part 61 of the product, achieving demolding without dragging.

[0047] Furthermore, because the angled ejector pin 51 holds the bent portion 61 stationary, while the sliding block 22 moves away from the bent portion 61, it is equivalent to demolding the bent portion 61 from the sliding block 22, thus completing the demolding operation of the undercut on the bent portion 61, allowing the entire mold to perform normal opening and closing operations. That is, when the sliding block 22 retracts to the preset distance, the auxiliary rod 34 disengages from the limiting groove 42, and the ejector pin spring 52 drives the sliding ejector pin to reset.

[0048] like Figure 2 , Figure 3 and Figure 6 As shown, preferably, the ejector pin assembly 50 is further provided with an ejector pin spring 52, which is sleeved on the inclined ejector pin 51. One end of the ejector pin spring 52 abuts against the sliding block 22, and the other end abuts against the inclined ejector pin 51.

[0049] Specifically, after the sliding shovel base 40 continues to move along the mold opening and closing direction, and the slider seat 30 is driven by the inclined guide post 43 to move a certain distance away from the bending part 61, that is, after the demolding operation of the bending part 61 is completed, the auxiliary rod 34 abuts against the limiting groove 42 and leaves the limiting groove 42, thereby losing the limiting effect of the limiting groove 42. The elastic force of the ejector spring 52 drives the inclined ejector pin 51 to move away from the bending part 61, and at the same time drives the auxiliary rod 34 to move synchronously, so that the auxiliary rod 34 and the inclined ejector pin 51 are restored to the initial state before the mold opening, waiting for the next mold closing operation.

[0050] like Figure 5 and Figure 6 As shown, preferably, the sliding shovel base 40 is also provided with a wedge-tightening inclined surface 41, which abuts against the end of the slider seat 30 away from the sliding slider 22.

[0051] Specifically, to press the slider seat 30 firmly, preferably, a wedge-shaped inclined surface 41 is provided on the side of the slide base 40 facing the slider seat 30, and the slider seat 30 also has an inclined surface with a corresponding inclination angle corresponding to the wedge-shaped inclined surface 41. This allows the wedge-shaped inclined surface 41 to press the slider seat 30 firmly during mold closing, preventing displacement between the slider seat 30 and the slide slider 22 due to melt pressure during injection molding, thus improving the quality of injection molding. The wedge-shaped inclined surface 41 also ensures precise positioning of the slider seat 30 during mold closing, improving the forming accuracy of the bent part 61.

[0052] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A sliding ejector pin structure for injection-molded bending products, characterized in that, The mold includes an upper mold assembly and a lower mold assembly (10) arranged opposite to each other. The lower mold assembly (10) is provided with a lower mold core (11), and the upper mold assembly is provided with an upper mold core. The upper mold core and the lower mold core (11) cooperate with each other to form a mold core structure with an injection cavity. A sliding assembly (20) is also provided on the side of the mold core structure. The sliding assembly (20) is used to injection mold the bent part (61) of the product. An ejector assembly (50) is provided inside the sliding assembly (20). The ejector assembly (50) is used to eject the bent part (61) of the product during demolding.

2. The ejector pin structure for injection-molded bending products according to claim 1, characterized in that, The sliding assembly (20) is provided with a sliding slider (22), a slider seat (30), a sliding shovel base (40), and a sliding pressure strip (21). The sliding pressure strip (21) is fixed to the lower mold assembly (10). The slider seat (30) is slidably connected to the lower mold assembly (10) through the sliding pressure strip (21). The sliding slider (22) is fixed to the slider seat (30). The sliding shovel base (40) is fixed to the upper mold assembly and is provided with an inclined guide post (43). The slider seat (30) is provided with an inclined guide hole (32) corresponding to the position of the inclined guide post (43), so that the inclined guide post (43) passes into the inclined guide hole (32) and guides the slider seat (30) obliquely.

3. The ejector pin structure for injection-molded bending products according to claim 2, characterized in that, The end of the sliding pressure bar (21) away from the sliding slider (22) is tilted at a certain angle towards the downward mold assembly (10) to form an oblique slide rail, so that the slider seat (30) moves obliquely along the oblique slide rail.

4. The ejector pin structure for injection-molded bending products according to claim 2, characterized in that, The end of the ejector pin assembly (50) away from the slide block (22) is tilted at a certain angle towards the mold assembly (10). The slide block (22) has an ejector pin hole (23) corresponding to the part of the ejector pin assembly (50), so that the ejector pin assembly (50) passes through the ejector pin hole (23) and moves obliquely.

5. The ejector pin structure for a molded bending product according to claim 4, characterized in that, The slider seat (30) is provided with an auxiliary countersunk hole (33), and an auxiliary rod (34) is inserted through the auxiliary countersunk hole (33). The ejector assembly (50) is provided with an oblique ejector (51). One end of the oblique ejector (51) is inserted through the ejector through hole (23), and the other end extends a certain length into the auxiliary countersunk hole (33) and abuts against the auxiliary rod (34).

6. The ejector pin structure for a molded bending product according to claim 5, characterized in that, The end of the auxiliary rod (34) away from the oblique ejector pin (51) passes through the auxiliary countersunk hole (33) and extends to a certain length to form an abutment with the bottom of the limiting groove (42) of the sliding shovel base (40).

7. The ejector pin structure for a molded bending product according to claim 6, characterized in that, The ejector assembly (50) is also provided with an ejector spring (52), which is sleeved on the oblique ejector (51). One end of the ejector spring (52) abuts against the sliding block (22), and the other end abuts against the oblique ejector (51).

8. The ejector pin structure for injection-molded bending products according to claim 2, characterized in that, The sliding shovel base (40) is also provided with a wedge-tightening inclined surface (41), which abuts against the end of the slider seat (30) away from the sliding slider (22).

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