Multi-sliding-block flaring injection mold demolding structure

Abstract

The utility model provides a multi-slide-block flaring injection mold demolding structure which comprises a driving pin connected to a mold in a sliding manner, and further comprises a plurality of first petal blocks and a plurality of second petal blocks which are connected to the driving pin in a sliding manner, and the plurality of first petal blocks and the plurality of second petal blocks are arranged at intervals and distributed along the axis of the driving pin; first convex parts are arranged on the edge of the first petal block, second convex parts are arranged on the edge of the second petal block, and a forming part used for forming an annular groove is formed between the multiple first convex parts and the multiple second convex parts; the driving pin moves in the length direction of the driving pin and enables the first petal block and the second petal block to move in the direction close to or away from the axis of the driving pin at the same time through the conduction assembly, the moving speed of the first petal block is higher than that of the second petal block, and efficient and lossless production of the plastic part with the internal inverted buckle is achieved through the technology which is simpler, lower in cost and more reliable in operation.

Description

Technical Field

[0001] This utility model relates to the field of injection molds, and in particular, to a demolding structure for a multi-slider flared injection mold. Background Technology

[0002] like Figure 1 The diagram shows the structure of an injection-molded product 1, where an annular groove 2 is located on the inner wall. However, demolding is a recognized technical challenge. When using traditional integral rigid core molding, after the plastic part solidifies, the concave annular groove 2 interferes with the core, preventing the core from being directly ejected axially. Forced removal can easily damage the plastic part or the mold. To solve this problem, existing technologies often rely on complex and expensive mold solutions, such as precision-manufactured, easily worn, shrinkable cores, or lateral core-pulling mechanisms that increase mold complexity. These solutions not only increase mold costs and maintenance difficulty but may also affect production efficiency and product quality. Therefore, the industry urgently needs a simpler, lower-cost, and more reliable technology to achieve efficient and non-destructive production of such plastic parts with internal undercuts, effectively solving the demolding dilemma of traditional rigid cores. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a demolding structure for multi-slider flared injection molds, which enables efficient and non-destructive production of plastic parts with internal undercuts through a simpler, lower-cost, and more reliable technology.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a multi-slider flared injection mold demolding structure, including a drive pin slidably connected to the mold, a limiting plate, and first and second segments slidably connected to the drive pin. Multiple first and second segments are arranged at intervals and distributed along the axis of the drive pin. The edges of the first segments are provided with first protrusions, and the edges of the second segments are provided with second protrusions. A forming portion for forming an annular groove is formed between the multiple first and second protrusions. The limiting plate is slidably connected to the mold and located at the end of the drive pin. The end of the drive pin, the first segments, and the second segments are all used to abut against the limiting plate. The drive pin moves along its own length direction, and through a transmission component, the first and second segments move simultaneously toward or away from the axis of the drive pin. The first segment moves faster than the second segment.

[0005] To achieve the above technical solution, before injection molding, the drive pin moves axially, and both the first and second segments abut against the limiting plate. Through the transmission component, the first and second segments expand radially along the drive pin, with their first and second protrusions forming the molding surface of the annular groove. During demolding, the drive pin moves in the opposite direction, causing the first and second segments to contract radially inward along the drive pin, releasing the inner undercut of the product. The ingenious aspect is that the first segment contracts faster than the second segment, achieving differentiated demolding. By converting the controlled axial movement of the drive pin into reliable radial contraction of the first and second segments, and especially by utilizing the differentiated speeds of the first and second segments, smooth and efficient demolding of products with inner annular grooves is achieved, significantly improving the reliability of injection molding production and product quality. The structure is simple, the cost is lower, and the operation is more reliable.

[0006] As a preferred embodiment of the present invention, the conductive component includes a first slide groove, a second slide groove, a first slider, and a second slider. The first slide groove and the second slide groove are both formed on the outer wall of the drive pin. The slope of the first slide groove is greater than the slope of the second slide groove. The first slider is fixed on the first petal block and slidably connected in the first slide groove. The second slider is fixed on the second petal block and slidably connected in the second slide groove.

[0007] To achieve the above technical solution, the sliding of the first and second sliders within the first and second slides with different angles cleverly transforms the same axial stroke of the drive pin into a radial movement speed where the first segment moves faster than the second segment. During demolding, this differentiated contraction speed allows the first and second segments to move radially inward at different rates, effectively avoiding interference or jamming that might occur if the first and second segments contract simultaneously. This enables step-by-step or smoother demolding of products with inner annular grooves. This transmission design based on the first and second slides with different angles is a key technical feature for achieving efficient and reliable demolding and optimizing the motion process, significantly improving mold stability and production efficiency.

[0008] As a preferred embodiment of the present invention, the first protrusion includes a first forming part and a first inclined surface. The first forming part is fixed on the first petal block, and the two first inclined surfaces are respectively opened on both sides of the first forming part and inclined towards the first forming part.

[0009] By implementing the above technical solution, motion interference is avoided when the first lobe expands or contracts radially.

[0010] As a preferred embodiment of the present invention, the second protrusion includes a second forming part and a second inclined surface. The second forming part is fixed on the second petal block. The two second inclined surfaces are respectively opened on both sides of the second forming part and are inclined towards the first forming part. The first inclined surface is used to abut against the second inclined surface.

[0011] To achieve the above technical solution, the first inclined surface on the first segment and the second inclined surface on the second segment abut against each other. When the injection-molded core expands into place, it is these alternating, abutting first and second inclined surfaces that allow adjacent first and second segments to fit tightly together, forming a continuous, seamless annular groove molding surface, effectively preventing flash from forming on the plastic product under high pressure. During demolding, these contacting first and second inclined surfaces act as sliding interfaces, guiding the first and second segments to retract smoothly inward, ensuring successful demolding. This precise fit design is key to achieving coordinated movement of the first and second segments, ensuring molding quality, and guaranteeing reliable demolding.

[0012] As a preferred embodiment of this utility model, the limiting plate includes a plate body, a first receiving groove, and a second receiving groove. The plate body is slidably connected to the mold and located at the end of the driving pin. The first receiving groove is opened on the surface of the plate body. The side walls of the first and second petal blocks are used to abut against the inner wall of the first receiving groove. The second receiving groove is opened on the bottom wall of the first receiving groove. The end of the driving pin is used to abut against the bottom wall of the second receiving groove.

[0013] To achieve the above technical solution, the limiting plate is a crucial control component in this demolding structure. It is slidably connected to the mold body and located at the end of the drive pin. The bottom wall of the second receiving groove serves as the abutment surface for the end of the drive pin, precisely limiting the forward stroke of the drive pin. The inner wall of the first receiving groove abuts against the side walls of the first and second segments, limiting the final outward expansion position of the first and second segments. This dual, graded limiting design provides a reliable physical stopping point for the drive pin and the first and second segments, which is crucial for controlling the precise position of the core in both expansion and contraction extreme states, greatly improving the stability and reliability of the entire demolding mechanism.

[0014] As a preferred embodiment of this utility model, a connecting inclined surface is provided on the end face of the plate, and a contact inclined surface is provided on the first and second petal blocks, wherein the connecting inclined surface is used to abut against the contact inclined surface.

[0015] To achieve the above technical solution, during the injection molding process, when the first and second segments are fully unfolded and form an annular groove molding surface, their contact slopes and the connecting slopes of the limiting plate are tightly abutted, ensuring that the first and second segments can be stably attached to the limiting plate to withstand the axial pressure of the molten plastic and effectively preventing the segments from retreating.

[0016] In a preferred embodiment of this utility model, the drive pin is hollow, and a connecting block is connected to the center of the limiting plate, with the connecting block located inside the drive pin.

[0017] To achieve the above technical solution, the hollow design of the drive pin and the internal connecting block connected to the center of the limiting plate enable independent axial movement of the drive pin and the limiting plate, supporting the staged demolding process. Attached Figure Description

[0018] Figure 1 This is a structural diagram of an injection-molded product;

[0019] Figure 2 This is a schematic diagram of the external structure of this utility model;

[0020] Figure 3 A three-dimensional sectional view illustrating this utility model;

[0021] Figure 4 A longitudinal sectional view is provided to illustrate this utility model;

[0022] Figure 5 This is a schematic diagram illustrating the expansion state of the first and second lobe segments;

[0023] Figure 6 To illustrate the structure of the limiting plate;

[0024] Figure 7 This is a schematic diagram illustrating the retraction state of the first and second lobe segments;

[0025] Figure 8 A schematic diagram showing the location of the first chute;

[0026] Figure 9 To illustrate the structural diagram of the first lobe;

[0027] Figure 10 A schematic diagram illustrating the structure of the second lobe;

[0028] Figure 11 This is a schematic diagram illustrating the structure of the drive pin.

[0029] Reference numerals: 1. Product; 2. Annular groove; 3. Drive pin; 4. Limiting plate; 5. First lobe block; 6. Second lobe block; 7. First protrusion; 8. Second protrusion; 10. Plate body; 11. First receiving groove; 12. Second receiving groove; 13. Connecting inclined surface; 14. Contact inclined surface; 15. Connecting block; 16. Conducting component; 17. First slide groove; 18. Second slide groove; 19. First slider; 20. Second slider; 21. First forming part; 22. First inclined surface; 23. Second forming part; 24. Second inclined surface. Detailed Implementation

[0030] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, so that the technical solution of this utility model can be more easily understood and mastered.

[0031] A demolding structure for a multi-slider flared injection mold includes a drive pin 3 slidably connected to the mold, and also includes a limiting plate 4, a first segment block 5, and a second segment block 6.

[0032] Six first-lobed blocks 5 and six second-lobed blocks 6 are arranged at intervals and distributed along the axis of the drive pin 3. The first-lobed blocks 5 and the second-lobed blocks 6 are slidably connected to the drive pin 3.

[0033] A first protrusion 7 is integrally connected to the edge of the first lobe 5, and a second protrusion 8 is integrally connected to the edge of the second lobe 6. A molding portion for forming an annular groove 2 for molding the product 1 is formed between the plurality of first protrusions 7 and the plurality of second protrusions 8. The molding portion is annular.

[0034] The limiting plate 4 is slidably connected to the mold and located at the end of the drive pin 3. The end of the drive pin, the first lobe block 5, and the second lobe block 6 are all used to abut against the limiting plate 4. The limiting plate 4 includes a plate body 10, a first receiving groove 11, and a second receiving groove 12. The plate body 10 is slidably connected to the mold and located at the end of the drive pin 3. The first receiving groove 11 is formed on the surface of the plate body 10, and the side walls of the first lobe block 5 and the second lobe block 6 are used to abut against the inner wall of the first receiving groove 11.

[0035] The second receiving groove 12 is formed on the bottom wall of the first receiving groove 11, and the end of the drive pin 3 is used to abut against the bottom wall of the second receiving groove 12.

[0036] A connecting inclined surface 13 is provided on the end face of the plate 10, and a contact inclined surface 14 is provided on the first petal block 5 and the second petal block 6. The connecting inclined surface 13 is used to abut against the contact inclined surface 14.

[0037] The drive pin 3 is hollow, and a connecting block 15 is integrally connected to the center of the limiting plate 4. The connecting block 15 is located inside the drive pin 3, so that the drive pin 3 and the limiting plate 4 can move independently.

[0038] The drive pin 3 moves along its own length direction and through the transmission component 16, the first petal block 5 and the second petal block 6 move simultaneously toward or away from the axis of the drive pin 3. The first petal block 5 moves faster than the second petal block 6.

[0039] The conductive assembly 16 includes a first slide groove 17, a second slide groove 18, a first slider 19, and a second slider 20. Both the first slide groove 17 and the second slide groove 18 are formed on the outer wall of the drive pin 3, and multiple first slide grooves 17 and multiple second slide grooves 18 are arranged at intervals. The slope of the first slide groove 17 is greater than the slope of the second slide groove 18. The first slider 19 is fixed to the first segment 5 and slidably connected in the first slide groove 17, and the second slider 20 is fixed to the second segment 6 and slidably connected in the second slide groove 18.

[0040] A first slider 19 is slidably connected within a first groove 17, and a second slider 20 is slidably connected within a second groove 18.

[0041] The first protrusion 7 includes a first forming part 21 and a first inclined surface 22. The first forming part 21 is integrally connected to the first petal block 5, and the two first inclined surfaces 22 are respectively opened on both sides of the first forming part 21 and inclined towards the first forming part 21.

[0042] The second protrusion 8 includes a second forming part 23 and a second inclined surface 24. The second forming part 23 is fixed on the second petal block 6, and the two second inclined surfaces 24 are respectively opened on both sides of the second forming part 23 and inclined towards the first forming part 21. The first inclined surface 22 is used to abut against the second inclined surface 24.

[0043] Before injection molding, the mold begins to close. The drive pin 3 moves forward axially, driving the first segment 5 and the second segment 6 to expand radially outward through the cooperation of the first slide groove 17, the second slide groove 18, the first slider 19, and the second slider 20. The twelve segments circumferentially close, and their edges, the first protrusion 7 and the second protrusion 8, form an annular molding surface for molding the annular groove 2 of the product 1. The first inclined surface 22 and the second inclined surface 24 between the first segment 5 and the second segment 6 abut against each other to achieve a seal. The drive pin 3 advances to the point where its end abuts against the bottom wall of the second receiving groove 12 of the limiting plate 4, precisely limiting the expansion stroke of the first segment 5 and the second segment 6. At the same time, the contact inclined surface 14 on the first segment 5 and the second segment 6 abuts against the connecting inclined surface 13 on the end face of the limiting plate 4, providing axial support. The first segment 5 and the second segment 6 are fully expanded into place, the mold is fully closed, and it is ready for plastic injection.

[0044] After the plastic cools and solidifies, the drive pin 3 moves axially backward relative to the limiting plate 4, driving the first petal block 5 and the second petal block 6 to retract radially inward through the transmission component 16. Since the slope of the first slide groove 17 is greater than that of the second slide groove 18, the retraction speed of the first petal block 5 is faster than that of the second petal block 6, achieving differentiated demolding and releasing the inner undercut of the product 1.

[0045] Of course, the above are just typical examples of this utility model. In addition, this utility model may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by this utility model.

Claims

1. A multi-slide, stretch-blow moulding mould stripping arrangement comprising a drive pin (3) slidably connected to the mould, characterised in that: Further comprising a limiting plate (4) and a first petal block (5) and a second petal block (6) which are slidably connected to the driving pin (3), a plurality of first petal blocks (5) and a plurality of second petal blocks (6) are arranged at intervals and distributed along the axis of the driving pin (3), the edge of the first petal block (5) is provided with a first protrusion (7), the edge of the second petal block (6) is provided with a second protrusion (8), a plurality of first protrusions (7) and a plurality of second protrusions (8) form a forming part for forming an annular groove (2), the limiting plate (4) is slidably connected to the mold and located at the end of the driving pin (3), the end of the driving pin, the first petal block (5) and the second petal block (6) are used to abut against the limiting plate (4), the driving pin (3) moves along the length direction of itself and moves the first petal block (5) and the second petal block (6) towards or away from the axis of the driving pin (3) through the transmission assembly (16), and the moving speed of the first petal block (5) is faster than that of the second petal block (6).

2. A multi-slide, stretch-blow mold stripping mechanism according to claim 1, wherein: The transmission assembly (16) comprises a first sliding groove (17), a second sliding groove (18), a first sliding block (19) and a second sliding block (20), the first sliding groove (17) and the second sliding groove (18) are both provided on the outer wall of the driving pin (3), the slope of the first sliding groove (17) is greater than that of the second sliding groove (18), the first sliding block (19) is fixed on the first petal block (5) and slidably connected in the first sliding groove (17), and the second sliding block (20) is fixed on the second petal block (6) and slidably connected in the second sliding groove (18).

3. The multi-slide, flared, injection mold stripping structure of claim 1 wherein: The first protrusion (7) comprises a first forming part (21) and a first inclined surface (22), the first forming part (21) is fixed on the first petal block (5), and two first inclined surfaces (22) are respectively provided on both sides of the first forming part (21) and inclined towards the first forming part (21).

4. The multi-slide, stretch-blow mold of claim 3 wherein: The second protrusion (8) comprises a second forming part (23) and a second inclined surface (24), the second forming part (23) is fixed on the second petal block (6), and two second inclined surfaces (24) are respectively provided on both sides of the second forming part (23) and inclined towards the first forming part (21), and the first inclined surface (22) is used to abut against the second inclined surface (24).

5. The multi-slide, flared, injection mold stripping structure of claim 1 wherein: The limiting plate (4) comprises a plate body (10), a first containing groove (11) and a second containing groove (12), the plate body (10) is slidably connected in the mold and located at the end of the driving pin (3), the first containing groove (11) is provided on the surface of the plate body (10), the side wall of the first petal block (5) and the second petal block (6) is used to abut against the inner wall of the first containing groove (11), and the second containing groove (12) is provided on the bottom wall of the first containing groove (11), and the end of the driving pin (3) is used to abut against the bottom wall of the second containing groove (12).

6. A multi-slide, stretch-blow mold stripping arrangement according to claim 5 wherein: A connecting inclined surface (13) is provided on the end surface of the plate body (10), a contact inclined surface (14) is provided on the first petal block (5) and the second petal block (6), and the connecting inclined surface (13) is used to abut against the contact inclined surface (14).

7. The multi-slide, stretch-blow mold of claim 1 wherein: The driving pin (3) is hollow, the center of the limiting plate (4) is connected with a connecting block (15), and the connecting block (15) is located in the inside of the driving pin (3).

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