Injection mold for impeller multilayer slider

Abstract

The utility model discloses a kind of injection mould of multilayer sliding block of impeller, it is related to injection mould technical field, by setting the demoulding mechanism containing circumferential guide block, sliding block and vertical movement spade base in upper die and lower die respectively, solve multilayer impeller reverse buckle demolding problem.Core innovation is in: spade base bevel vertex is formed mechanical self-locking when clamping, resist the lateral force of injection high pressure to sliding block, eliminate sliding block backward displacement;Anti-retreat fixed block built-in cooling water channel directly cools locking contact area, inhibit the change of fit clearance caused by thermal expansion;Its contact area inlay replaceable hard alloy wear-resistant insert, maintain long-term locking reliability by high wear resistance characteristics and modular design.Three synergistically guarantee the thickness and angle size precision of impeller blade, solve the product out-of-tolerance defect caused by sliding block micro-retraction of traditional mould, improve forming quality and mould life.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to an injection mold for a multi-layer slider impeller. Background Technology

[0002] Impellers, as key components widely used in fluid machinery, typically feature complex multi-layered blades with undercut surfaces. These impellers are usually manufactured using injection molding. In injection mold design, to mold the complex multi-layered undercut structure of the impeller blades, circumferentially distributed slide release mechanisms are often required in both the upper and lower molds.

[0003] However, existing slider mechanisms used in injection molding of such multi-layer impellers face a significant challenge: during high-pressure injection molding, the molten plastic exerts enormous lateral pressure on the slider. If the slider's locking force is insufficient or its structural rigidity is inadequate, it can easily lead to a slight backward displacement of the slider during injection. Even a very small amount of this backward displacement can cause changes in the mold cavity dimensions, resulting in deviations from design requirements for critical dimensions such as the thickness and angle of the molded impeller blades. Therefore, we propose an injection mold for a multi-layer slider mechanism for impellers. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing an injection mold for a multi-layer slider impeller.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An injection mold for a multi-layer impeller slider includes an upper mold and a lower mold. The upper mold is provided with an upper mold slider demolding mechanism, and the lower mold is provided with a lower mold slider demolding mechanism. Both the upper mold slider demolding mechanism and the lower mold slider demolding mechanism include: a plurality of circumferentially distributed guide blocks, with guide grooves formed between adjacent guide blocks; a plurality of sliders slidably disposed in the guide grooves; a shovel base disposed at the outlet of the guide groove, the shovel base being movable perpendicular to the mold plate plane; the shovel base and the sliders are connected by a slope mating structure; the apex of the slope of the shovel base abuts against an anti-retraction fixing block in the mold-closed state; the anti-retraction fixing block is disposed at the bottom of the shovel base of the upper mold slider demolding mechanism or the top of the shovel base of the lower mold slider demolding mechanism; the anti-retraction fixing block has a cooling water channel inside, with its inlet and outlet extending to the side of the anti-retraction fixing block; a replaceable wear-resistant insert is embedded in the contact area between the anti-retraction fixing block and the apex of the shovel base.

[0006] Preferably, the guide block is fixedly mounted on the template of the upper or lower mold.

[0007] Preferably, the shovel base is driven by the mold's ejection system or mold opening and closing system to move perpendicular to the template plane.

[0008] Preferably, the inclined surface mating structure includes: a slide rail provided on the inclined surface of the shovel base; a slide groove provided on the slider and mating with the slide rail; the mating direction of the slide rail and the slide groove forms a right-angled triangle structure with the movement direction of the shovel base and the movement direction of the slider.

[0009] Preferably, the slide rail is a T-shaped convex rail, and the slide groove is a T-shaped recess that matches it.

[0010] Preferably, the anti-retraction fixing block is fixedly installed on the template of the lower mold and located at the rear gap of the adjacent shovel base in the circumferential direction.

[0011] Preferably, the slider of the upper mold slider demolding mechanism is used to form the undercut structure on the upper surface of the impeller, and the slider of the lower mold slider demolding mechanism is used to form the undercut structure on the lower surface of the impeller.

[0012] Preferably, the cooling water channel has a U-shaped loop structure, with its inlet and outlet located on the same end face of the anti-reverse fixing block.

[0013] Preferably, the surface of the wear-resistant insert is provided with oil-retaining micro-pits.

[0014] Preferably, the wear-resistant insert and the anti-retraction fixing block body are interference-fitted and fixed from the back of the anti-retraction fixing block by countersunk screws.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This device utilizes a rigid abutment structure between the anti-retraction fixing block and the apex of the shovel base slope to create a stable mechanical self-locking mechanism in the mold-closed state. When the molten plastic generates enormous lateral pressure on the slider, this structure effectively prevents any slight backward displacement of the slider during the injection molding process, eliminating mold cavity dimensional changes caused by slider displacement. This ensures that the critical dimensions such as the thickness and angle of the molded impeller blades meet design requirements, improving product precision and consistency. By integrating cooling channels (especially the U-shaped loop design) inside the anti-retraction fixing block, the contact area between the shovel base and the anti-retraction block, which bears a huge clamping reaction force, can be directly and efficiently cooled. This design effectively suppresses the thermal expansion of this critical area caused by frictional heat generation and plastic heat conduction during continuous high-pressure injection molding cycles, maintains the stability of the mating clearance, and thus ensures the long-term reliability and dimensional accuracy of the anti-retraction locking mechanism, extending the service life and stability of the mold under harsh working conditions. Replaceable carbide wear-resistant inserts are embedded in the contact area between the anti-retraction fixing block and the apex of the shovel base, and secured with countersunk screws and interference fits to enhance the wear resistance of this high-frequency, high-stress contact surface. Combined with an oil reservoir micro-dimple design, lubrication conditions are further improved, reducing wear. When the insert wears to its limit, only this small insert needs to be replaced to restore the locking function, avoiding the scrapping of the entire large anti-retraction fixing block and reducing the difficulty and cost of mold maintenance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments 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.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the lower mold slider demolding mechanism of this utility model; Figure 3 This is a schematic diagram of the upper mold slider demolding mechanism of this utility model; Figure 4 This is a schematic diagram of the shovel base structure of this utility model; Figure 5 This is a schematic diagram of the inclined plane mating structure of this utility model; Figure 6 This is a partial cross-sectional view of the anti-retraction fixing block of this utility model; Figure 7 This is a schematic diagram of the wear-resistant insert structure of this utility model.

[0018] Drawing number explanation: 1. Upper mold; 2. Lower mold; 3. Upper mold slider demolding mechanism; 4. Lower mold slider demolding mechanism; 5. Guide block; 6. Guide groove; 7. Slider; 8. Shovel base; 9. Angled surface mating structure; 10. Anti-retraction fixing block; 11. Cooling water channel; 12. Wear-resistant insert; 13. Slide rail; 14. Slide groove; 15. Oil storage micro-recess; 16. Countersunk screw. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the present invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0021] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0022] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number. Example

[0023] Please see Figure 1-7 An injection mold for a multi-layer impeller slider includes an upper mold 1 and a lower mold 2. The upper mold 1 is provided with an upper mold slider demolding mechanism 3, and the lower mold 2 is provided with a lower mold slider demolding mechanism 4. Both the upper mold slider demolding mechanism 3 and the lower mold slider demolding mechanism 4 include: a plurality of guide blocks 5 distributed circumferentially, with guide grooves 6 formed between adjacent guide blocks 5; a plurality of sliders 7 slidably disposed in the guide grooves 6; a shovel base 8 disposed at the outlet of the guide grooves 6, which can move perpendicular to the mold plate plane; the shovel base 8 and the sliders 7 are connected by a slope mating structure 9; the apex of the slope of the shovel base 8 abuts against an anti-retraction fixing block 10 in the mold closing state; the anti-retraction fixing block 10 is disposed at the bottom of the shovel base 8 of the upper mold slider demolding mechanism 3 or the top of the shovel base 8 of the lower mold slider demolding mechanism 4; the rigid abutment between the anti-retraction fixing block 10 and the apex of the slope of the shovel base 8 forms a mechanical self-locking mechanism, which withstands the lateral force generated by the high injection pressure when the mold is closed, and completely eliminates the backward displacement of the slider 7. The anti-retraction fixing block 10 has a cooling water channel 11 inside, with its inlet and outlet extending to the side of the anti-retraction fixing block 10 to directly cool the locking contact area and suppress the change in the fit clearance caused by thermal expansion. The contact area between the anti-retraction fixing block 10 and the apex of the shovel base 8 is fitted with a replaceable wear-resistant insert 12. Through the optimized design of the hard alloy material and the contact surface, the stability of long-term high-frequency locking is ensured. The three work together to ensure the dimensional accuracy of the impeller blades.

[0024] The guide block 5 is fixedly mounted on the template of the upper mold 1 or the lower mold 2, forming a rigid guide groove 6 frame, which provides a precise linear motion trajectory for the slider 7. This structure avoids the deformation of traditional elastic guide components caused by high pressure, ensures that the multiple sliders 7 move synchronously in a circumferentially distributed state, and prevents the risk of misalignment in the blade forming cavity.

[0025] Meanwhile, the shovel base 8 is driven by the mold's ejection system or mold opening and closing system to move perpendicular to the template plane. When the mold opens, it drives the slider 7 to retract radially and disengage from the impeller undercut. When the mold closes, it pushes the slider 7 to precisely reset. The system linkage design synchronizes the movement of the shovel base 8 with the main action of the mold, avoiding mechanical interference, and is especially suitable for the time-sequential demolding requirements of multi-layer sliders 7.

[0026] In this technical solution, the inclined surface mating structure 9 includes: a slide rail 13 disposed on the inclined surface of the shovel base 8; and a slide groove 14 disposed on the slider 7 and mating with the slide rail 13. The mating direction of the slide rail 13 and the slide groove 14 forms a right-angled triangle structure with the movement direction of the shovel base 8 and the movement direction of the slider 7, thereby converting the vertical movement of the shovel base 8 into the horizontal movement of the slider 7. The right-angled triangle hypotenuse angle design decomposes the vertical driving force into a horizontal thrust and a self-locking normal force, which not only achieves efficient displacement of the slider 7, but also enhances the self-locking anti-retraction capability in the mold closing state through the principle of inclined surface friction angle. The slide rail 13 is a T-shaped convex rail, and the slide groove 14 is a T-shaped groove that matches it, providing a force transmission path with high shear rigidity. The T-shaped interface can withstand multi-directional loads caused by injection molding pressure, preventing the slide rail 13 / slide groove 14 from undergoing plastic deformation under repeated impacts, and ensuring the service life of the motion conversion mechanism; In addition, the anti-retraction fixing block 10 is fixedly installed on the template of the lower mold 2 and located at the rear gap of the adjacent circumferential shovel base 8, forming a compact circumferential locking network. Its gap layout avoids interfering with the movement of the slider 7, and at the same time, it disperses the mold clamping reaction force through multi-point support, enhancing the overall rigidity of the mold, which is especially suitable for high-pressure injection molding of large-size impellers.

[0027] In this technical solution, the slider 7 of the upper mold slider demolding mechanism 3 is used to form the undercut structure on the upper surface of the impeller, and the slider 7 of the lower mold slider demolding mechanism 4 is used to form the undercut structure on the lower surface of the impeller, realizing the synchronous forming of the undercut structure on both sides of the impeller. The upper mold 1 slider 7 precisely controls the structure on the upper surface of the blade, and the lower mold 2 slider 7 forms the features on the lower surface. The two mechanisms work together to ensure the spatial positioning accuracy of the multi-layer blades and avoid overflow on the mold closing surface.

[0028] It is worth noting that the cooling water channel 11 has a U-shaped loop structure, with its inlet and outlet located on the same end face of the anti-retraction fixing block 10, achieving the shortest flow path through the inlet / outlet on the same side. The U-shaped path allows the coolant to flow evenly through the high-heat-load area of ​​the locking contact zone, quickly dissipating frictional heat and plastic conduction heat, maintaining the dimensional stability of the anti-retraction block, and avoiding self-locking failure caused by thermal deformation.

[0029] In this technical solution, the wear-resistant insert 12 and the anti-retraction fixing block 10 body are fitted with an interference fit and fixed from the back of the anti-retraction fixing block 10 by countersunk screws 16, ensuring that the wear-resistant insert 12 does not loosen under high-frequency impact. The interference fit eliminates the fit clearance, and the countersunk screws 16 provide axial mechanical restraint. The two work together to prevent the insert from fretting wear. At the same time, the back mounting method allows for quick replacement of the insert without disassembling the mold body.

[0030] The working principle of this device is as follows: During mold closing, the ejection / opening / closing system drives the upper mold shovel base 8 to move vertically downwards, or drives the lower mold shovel base 8 to move vertically upwards. Through the inclined surface cooperation of the slide rail 13-slide groove 14, the vertical driving force is converted into a radially outward horizontal thrust of the slider 7, allowing the slider 7 to precisely return to the impeller blade forming position. When the shovel base 8 reaches its end point, its inclined apex rigidly abuts against the wear-resistant insert 12 of the anti-retraction fixing block 10, forming a right-angled triangular force system: the lateral force generated by the high injection pressure acts on the slider 7, and the reaction force of the anti-retraction block is converted into a normal locking force through the inclined surface, satisfying... ( The self-locking condition (for the coefficient of friction) completely suppresses the backward movement of the slider 7; at the same time, the coolant circulates through the anti-backward block U-shaped cooling water channel 11 to absorb the frictional heat and plastic conduction heat generated by the clamping reaction force in the contact area of ​​the shovel base 8-wear-resistant insert 12, and maintain the stability of the mating dimensions. When the mold is opened, the ejection system pulls the shovel base 8 vertically backward. Its inclined surface drives the slider 7 to shrink radially inward along the guide groove 6 through the slide rail 13-slide groove 14. The upper mold 1 slider 7 disengages from the upper surface of the impeller and the lower mold 2 slider 7 disengages from the lower surface. The multi-layer blades are released without interference.

[0031] Upon re-closing the mold, the spade base 8 advances vertically again, pushing the slider 7 radially back to the molding position along the precision trajectory formed by the guide block 5. The apex of the spade base 8 abuts against the wear-resistant insert 12 again. The interference fit and countersunk screw 16 ensure that the insert does not shift under high impact, restoring the self-locking force system. The cooling channel 11 continuously dissipates heat from the contact area, preventing the self-locking gap from increasing due to thermal expansion, and providing a stable locking force for the next injection cycle. Example

[0032] Please see Figure 7 The wear-resistant insert 12 has oil-retaining micro-pits 15 on its surface, which form a micro-oil film lubrication layer under high pressure locking. The pit structure absorbs lubricating oil and continuously releases it to the friction interface, reducing dry friction between the cemented carbide and the steel part of the shovel base 8, and reducing the wear rate and the risk of abnormal noise.

[0033] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the principles, the implementation of the present invention may have any modifications or variations.

Claims

1. An injection mold for a multi-layer slider impeller, comprising an upper mold (1) and a lower mold (2); Its features are: The upper mold (1) is provided with an upper mold slider demolding mechanism (3), and the lower mold (2) is provided with a lower mold slider demolding mechanism (4). Both the upper mold slider demolding mechanism (3) and the lower mold slider demolding mechanism (4) include: Multiple guide blocks (5) are distributed circumferentially, and guide grooves (6) are formed between adjacent guide blocks (5); Multiple sliders (7) are slidably disposed in the guide groove (6); The shovel base (8) is provided at the outlet of the guide groove (6), and the shovel base (8) can move perpendicular to the template plane; The shovel base (8) and the slider (7) are connected by a beveled fit structure (9); The apex of the inclined surface of the shovel base (8) abuts against the anti-retraction fixing block (10) in the mold closing state. The anti-retraction fixing block (10) is located at the bottom of the shovel base (8) of the upper mold slider demolding mechanism (3) or at the top of the shovel base (8) of the lower mold slider demolding mechanism (4); The anti-retraction fixing block (10) is provided with a cooling water channel (11) inside, and its inlet and outlet extend to the side of the anti-retraction fixing block (10); The contact area between the anti-retraction fixing block (10) and the apex of the shovel base (8) is fitted with a replaceable wear-resistant insert (12).

2. The injection mold for a multi-layer slide block impeller according to claim 1, characterized in that: The guide block (5) is fixedly mounted on the template of the upper mold (1) or the lower mold (2).

3. The injection mold for a multi-layer slide block impeller according to claim 1, characterized in that: The shovel base (8) is driven by the ejection system or the mold opening and closing system of the mold to move perpendicular to the template plane.

4. The injection mold for a multi-layer slide block impeller according to claim 1, characterized in that: The inclined surface mating structure (9) includes: a slide rail (13) provided on the inclined surface of the shovel base (8); a slide groove (14) provided on the slider (7) and mating with the slide rail (13); the mating direction of the slide rail (13) and the slide groove (14) forms a right-angled triangle structure with the movement direction of the shovel base (8) and the movement direction of the slider (7).

5. The injection mold for a multi-layer slider impeller according to claim 4, characterized in that: The slide rail (13) is a T-shaped convex rail, and the slide groove (14) is a T-shaped groove that matches it.

6. The injection mold for a multi-layer slide block impeller according to claim 1, characterized in that: The anti-retraction fixing block (10) is fixedly installed on the template of the lower mold (2) and located in the rear gap of the circumferential adjacent shovel base (8).

7. The injection mold for a multi-layer slide block impeller according to claim 1, characterized in that: The slider (7) of the upper mold slider demolding mechanism (3) is used to form the undercut structure on the upper surface of the impeller, and the slider (7) of the lower mold slider demolding mechanism (4) is used to form the undercut structure on the lower surface of the impeller.

8. The injection mold for a multi-layer slide block impeller according to claim 1, characterized in that: The cooling water channel (11) has a U-shaped loop structure, and its inlet and outlet are located on the same end face of the anti-retraction fixing block (10).

9. The injection mold for a multi-layer slider impeller according to claim 1, characterized in that: The wear-resistant insert (12) has oil-retaining micro-pits (15) on its surface.

10. The injection mold for a multi-layer slide block impeller according to claim 1, characterized in that: The wear-resistant insert (12) is interference-fitted with the anti-retraction fixing block (10) body and is fixed from the back of the anti-retraction fixing block (10) by countersunk screws (16).

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