A detachable polyurethane sand box casting mold

Abstract

The utility model relates to the technical field of mould design and manufacture, disclose a kind of detachable polyurethane sand box casting mould, including upper mould plate, the lower surface of upper mould plate is provided with lower mould plate, the lower surface of lower mould plate is provided with mould core, lower mould plate outer wall is fixedly connected with handle, the lower surface of mould core is fixedly connected with shell, hole is provided in the shell inside, the lower surface of shell is fixedly connected with base, the outer wall of upper mould plate is fixedly connected with handle, hole is provided in the mould core inside, the inner wall of shell is provided with ejector assembly, the outer wall of lower mould plate is provided with dismounting assembly.In the utility model, by ejector assembly, when polyurethane forming product stripping, even if using stripping agent and other chemical reagent, it is still difficult to realize fast, nondestructive stripping, and operators often need to pry with care or spend a lot of time manually peeling, restrict the problem of production efficiency.

Description

Technical Field

[0001] This utility model relates to the field of mold design and manufacturing technology, and in particular to a detachable polyurethane sand casting mold. Background Technology

[0002] Polyurethane (PU) materials are widely used in the manufacture of various industrial parts, shoe soles, seals, shock absorbers, rollers, and wood-look furniture trim pieces due to their excellent physical and mechanical properties, adjustable hardness range, and good processing adaptability. Polyurethane casting molds are the key tooling for achieving large-scale, precise production of these products. This technology is particularly suitable for scenarios involving complex shapes, high dimensional accuracy requirements, mass production, or specific surface quality requirements. Applications include manufacturing precision sealing rings and interior cushioning pads in the automotive industry; producing high-performance shoe soles in the footwear industry; and manufacturing customized wear-resistant rollers or large seals in industrial fields. Without efficient, precise, and durable casting molds, the superior properties of polyurethane materials cannot be economically and reliably transformed into end products that meet design requirements.

[0003] Currently, mainstream polyurethane casting molds typically employ a modular metal mold structure. The basic implementation involves a mold composed of an upper mold, a lower mold, and necessary side core-pulling sliders, with guide pillars or locating pins ensuring mold closing accuracy. The mold's interior is machined with a cavity matching the product shape, and includes a gating system to guide the injection of raw materials, as well as venting channels to expel air from the cavity.

[0004] However, this traditional structure has several significant drawbacks in practice. For products with deep cavities, slender protrusions, inverted surfaces, or complex textured surfaces, even with the use of mold release agents, it is still difficult to achieve rapid and non-destructive demolding. Operators often need to carefully pry with tools or spend a lot of time manually peeling them off, which restricts the improvement of production efficiency and automation levels. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a detachable polyurethane sand box casting mold, which aims to improve the problem that when demolding polyurethane molded products, even with the use of release agents, it is still difficult to achieve fast and damage-free demolding. Operators often need to carefully pry with tools or spend a lot of time manually peeling off the mold, which restricts production efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a detachable polyurethane sand casting mold, comprising an upper template, a lower template disposed on the lower surface of the upper template, a mold core disposed on the lower surface of the lower template, a shell fixedly connected to the lower surface of the mold core, a base fixedly connected to the lower surface of the shell, a handle fixedly connected to the outer wall of the upper template, an ejection assembly disposed on the inner wall of the shell, and a disassembly assembly disposed on the outer wall of the lower template; The ejection assembly includes an ejection plate disposed on the inner wall of the housing. A lifting rod is fixedly connected to the lower surface of the ejection plate. A guide plate is slidably connected to the outer wall of the lifting rod. The housing is fixedly connected to the outer wall of the guide plate. A fixing plate is fixedly connected to the outer wall of the lifting rod. A spring is provided on the outer wall of the lifting rod. A bearing seat is fixedly connected to the lower surface of the ejection plate. A bearing body is rotatably connected to the inner wall of the bearing seat. A slider is slidably connected to the outer wall of the bearing body. A guide rail is slidably connected to the outer wall of the slider. A push-pull rod is fixedly connected to the outer wall of the slider.

[0007] Furthermore, the disassembly assembly includes an upper fixing plate, which is disposed on the outer wall of the lower template. A lower fixing plate is disposed below the upper fixing plate. A flip cover is rotatably connected to the outer wall of the lower fixing plate, and a threaded rod is threadedly connected to the inner wall of the lower fixing plate.

[0008] Furthermore, the mold core has holes inside.

[0009] Furthermore, the outer wall of the ejector plate is slidably connected to the inner wall of the mold core.

[0010] Furthermore, the outer casing has openings inside, and the outer wall of the lifting rod is slidably connected to the inner wall of the outer casing.

[0011] Furthermore, the outer wall of the guide rail is fixedly connected to the inner wall of the housing, and the outer wall of the housing is fixedly connected to the base.

[0012] Furthermore, the upper fixing plate has a countersunk hole one inside, and the flip cover has a countersunk hole two inside.

[0013] Furthermore, an upper template is fixedly connected to the outer wall of the upper fixing plate, and a lower template is fixedly connected to the outer wall of the lower fixing plate.

[0014] This utility model has the following beneficial effects: In this invention, when demolding and disassembly are completed via the ejector assembly, the push-pull rod pushes forward, causing the slider to move within the guide rail's restricted range. The slider's movement then drives the bearing body upwards, which in turn causes the ejector plate to eject the polyurethane product, completing the disassembly. The fixed plate and spring work together to cause the lifting rod to move downwards and reset without external force. This achieves rapid and non-destructive demolding of the molded product, improving production efficiency and reducing labor costs.

[0015] In this invention, fixing and disassembly are accomplished through a disassembly assembly. The disassembly assembly includes an upper fixing plate and a lower fixing plate below it. A flip cover is rotatably connected to the outer wall of the lower fixing plate, and a threaded rod is threadedly connected inside the lower fixing plate. By rotating the threaded rod to an appropriate position, a countersunk hole two on the flip cover can pass through the threaded rod and connect with a countersunk hole one inside the upper fixing plate. Further rotation of the threaded rod makes the flip cover difficult to move, thus fixing the upper and lower templates. Conversely, rotating the threaded rod allows the upper and lower templates to be disassembled. This achieves the effect of quick fixing and disassembly of the upper and lower templates, making disassembly more convenient. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of a detachable polyurethane sand casting mold proposed in this utility model. Figure 2 This is a schematic diagram of the core part of a detachable polyurethane sand casting mold proposed in this utility model. Figure 3 This is a schematic diagram of the lower template portion of a detachable polyurethane sand casting mold proposed in this utility model. Figure 4 This is a schematic diagram of the ejector plate portion of a detachable polyurethane sand casting mold proposed in this utility model. Figure 5 for Figure 1 Enlarged view of point A.

[0017] Legend: 1. Upper template; 2. Lower template; 3. Mold core; 4. Outer shell; 5. Base; 6. Handle; 7. Ejector plate; 8. Lifting rod; 9. Guide plate; 10. Fixing plate; 11. Spring; 12. Guide rail; 13. Slider; 14. Push-pull rod; 15. Bearing body; 16. Bearing seat; 17. Flip cover; 18. Upper fixing plate; 19. Lower fixing plate; 20. Threaded rod; 21. Countersunk hole one; 22. Countersunk hole two. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Reference Figures 1-5The present invention provides an embodiment of a detachable polyurethane sand casting mold, comprising an upper template 1, a lower template 2 disposed on the lower surface of the upper template 1, a mold core 3 disposed on the lower surface of the lower template 2, the lower template 2 and the mold core 3 combined to form a mold cavity, the mold cavity being used to contain and mold liquid polyurethane raw material, causing it to undergo a chemical reaction within the mold, a shell 4 fixedly connected to the lower surface of the mold core 3, a base 5 fixedly connected to the lower surface of the shell 4, a handle 6 fixedly connected to the outer wall of the upper template 1, the upper template 1 being assembled and disassembled by pulling the handle 6, an ejection component disposed on the inner wall of the shell 4, and a disassembly component disposed on the outer wall of the lower template 2; The ejection assembly includes an ejection plate 7, which is disposed on the inner wall of the housing 4. A lifting rod 8 is fixedly connected to the lower surface of the ejection plate 7. The upward movement of the lifting rod 8 can cause the ejection plate 7 to move upward and eject the product. The downward movement of the lifting rod 8 can cause the ejection plate 7 to return to its original position. A guide plate 9 is slidably connected to the outer wall of the lifting rod 8, restricting the directional movement of the lifting rod 8. The housing 4 is fixedly connected to the outer wall of the guide plate 9. A fixing plate 10 is fixedly connected to the outer wall of the lifting rod 8. A spring 11 is provided on the outer wall of the lifting rod 8. The fixing plate 10 and the spring 11 work together to lift the product. The lowering rod 8 moves downwards to reset without external force. A bearing seat 16 is fixedly connected to the lower surface of the ejector plate 7. A bearing body 15 is rotatably connected to the inner wall of the bearing seat 16. The bearing body 15 rotates in the bearing seat 16. A slider 13 is slidably connected to the outer wall of the bearing body 15. The slider 13 is ramp-shaped. The movement of the slider 13 drives the bearing body 15 to rise and fall. A guide rail 12 is slidably connected to the outer wall of the slider 13. The guide rail 12 restricts the directional movement of the slider 13. A push-pull rod 14 is fixedly connected to the outer wall of the slider 13. Pushing the push-pull rod 14 provides power.

[0020] Specifically, by pushing the push-pull rod 14 forward, the slider 13 is restricted to move on the guide rail 12. The movement of the slider 13 then drives the bearing body 15 to move upward, which in turn drives the ejector plate 7 to move upward and eject the formed product. The lower surface of the ejector plate 7 is fixedly connected to the lifting rod 8. The outer wall of the lifting rod 8 is slidably connected to the guide plate 9. The guide plate 9 restricts the movement of the lifting rod 8 to only move up and down in a directional manner. The outer wall of the lifting rod 8 is fixedly connected to the fixing plate 10. A spring 11 is set on the outer wall of the lifting rod 8. Under the combined action of the fixing plate 10 and the spring 11, the lifting rod 8 moves downward and resets without the action of external force.

[0021] Reference Figures 1-5The disassembly assembly includes an upper fixing plate 18, which is disposed on the outer wall of the lower template 2. A lower fixing plate 19 is disposed below the upper fixing plate 18. A flip cover 17 is rotatably connected to the outer wall of the lower fixing plate 19. The flip cover 17 can rotate inside the lower fixing plate 19. The flip cover 17 can be connected to a countersunk hole 21 on the upper fixing plate 19 for fixation. A threaded rod 20 is threadedly connected to the inner wall of the lower fixing plate 19. A hole is opened inside the mold core 3. The outer wall of the ejector plate 7 is slidably connected to the inner wall of the mold core 3. The outer shell 4 has holes inside. The outer wall of the lifting rod 8 is slidably connected to the inner wall of the outer shell 4. The outer wall of the guide rail 12 is fixedly connected to the inner wall of the outer shell 4. The outer wall of the outer shell 4 is fixedly connected to the base 5. The upper fixing plate 18 has a countersunk hole 21 inside. The flip cover 17 has a countersunk hole 22 inside. The threaded rod 20 can pass through the countersunk hole 22. Rotating the threaded rod 20 can fix the flip cover 17. The upper template 1 is fixedly connected to the outer wall of the upper fixing plate 18. The lower template 2 is fixedly connected to the outer wall of the lower fixing plate 19.

[0022] Specifically, when the threaded rod 20 is rotated to the appropriate position, the countersunk hole 22 of the flip cover 17 can pass through the threaded rod 20 and connect with the countersunk hole 21 of the inner wall of the upper fixed plate. Rotating the threaded rod 20 can fix the flip cover 17 and make it difficult to move, thus fixing the upper template 1 and the lower template 2. Conversely, the upper template 1 and the lower template 2 can be disassembled.

[0023] Working principle: When a detachable polyurethane sand casting mold is required, the lower template 2, mold core 3, outer shell 4, and base 5 are first assembled by using external force through the handle 6 via the guide post and opening. When polyurethane products need to be produced, the lower template 2 and mold core 3 are combined to form a mold cavity. The mold cavity is used to contain and mold liquid polyurethane raw materials, allowing them to undergo a chemical reaction within the mold. Liquid polyurethane raw materials are introduced into the mold cavity, and the upper template 1 is covered. After the reaction is complete, the molded product is formed. When it is necessary to demold and disassemble the molded product, disassembly is achieved through the ejection assembly. The ejection assembly includes an ejection plate 7, a lifting rod 8 is fixedly connected to the lower surface of the ejection plate 7, a guide plate 9 is slidably connected to the outer wall of the lifting rod 8, the guide plate 9 restricts the movement of the lifting rod 8 to only directional up and down movement, a shell 4 is fixedly connected to the outer wall of the guide plate 9, a fixing plate 10 is fixedly connected to the outer wall of the lifting rod 8, and a spring 11 is provided on the outer wall of the lifting rod 8. Under the combined action of the fixing plate 10 and the spring 11, the lifting rod 8 moves downward and resets without external force. A bearing seat 16 is fixedly connected to the lower surface of the ejection plate 7, a bearing body 15 is rotatably connected to the inner wall of the bearing seat 16, a slider 13 is slidably connected to the outer wall of the bearing body 15, a guide rail 12 is slidably connected to the outer wall of the slider 13, and a push-pull rod 14 is fixedly connected to the outer wall of the slider 13. The push-pull rod 14 pushes forward, causing the slider 13 to move in a way that restricts its movement on the guide rail 12. The movement of the slider 13 then causes the bearing body 15 to move upward, which in turn causes the ejection plate 7 to eject the polyurethane product and complete the disassembly. When it is necessary to fix and disassemble the upper template 1 and the lower template 2, the fixing and disassembly are completed by the disassembly assembly. The disassembly assembly includes an upper fixing plate 18, and a lower fixing plate 19 is set below the upper fixing plate 18. The outer wall of the lower fixing plate 19 is rotatably connected to the flip cover 17, and the inner wall of the lower fixing plate 19 is threadedly connected to the threaded rod 20. When the threaded rod 20 is rotated to the appropriate position, the countersunk hole 22 opened by the flip cover 17 can pass through the threaded rod 20 and connect with the countersunk hole 21 inside the upper fixing plate 18. Rotating the threaded rod 20 can fix the flip cover 17 so that it is difficult to move, thereby fixing the upper template 1 and the lower template 2. Conversely, the upper template 1 and the lower template 2 can be disassembled.

[0024] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A detachable polyurethane sand casting mold, comprising an upper template (1), characterized in that: The lower surface of the upper template (1) is provided with a lower template (2), the lower surface of the lower template (2) is provided with a mold core (3), the lower surface of the mold core (3) is fixedly connected with a shell (4), the lower surface of the shell (4) is fixedly connected with a base (5), the outer wall of the upper template (1) is fixedly connected with a handle (6), the inner wall of the shell (4) is provided with an ejection component, and the outer wall of the lower template (2) is provided with a disassembly component; The ejection assembly includes an ejection plate (7), which is disposed on the inner wall of the outer shell (4). A lifting rod (8) is fixedly connected to the lower surface of the ejection plate (7). A guide plate (9) is slidably connected to the outer wall of the lifting rod (8). The outer wall of the guide plate (9) is fixedly connected to the outer shell (4). A fixing piece (10) is fixedly connected to the outer wall of the lifting rod (8). A spring (11) is provided on the outer wall of the lifting rod (8). A bearing seat (16) is fixedly connected to the lower surface of the ejection plate (7). A bearing body (15) is rotatably connected to the inner wall of the bearing seat (16). A slider (13) is slidably connected to the outer wall of the bearing body (15). A guide rail (12) is slidably connected to the outer wall of the slider (13). A push-pull rod (14) is fixedly connected to the outer wall of the slider (13).

2. The detachable polyurethane sand casting mold according to claim 1, characterized in that: The disassembly assembly includes an upper fixing plate (18), which is disposed on the outer wall of the lower template (2). A lower fixing plate (19) is disposed below the upper fixing plate (18). A flip cover (17) is rotatably connected to the outer wall of the lower fixing plate (19), and a threaded rod (20) is threadedly connected to the inner wall of the lower fixing plate (19).

3. The detachable polyurethane sand casting mold according to claim 1, characterized in that: The mold core (3) has holes inside.

4. The detachable polyurethane sand casting mold according to claim 1, characterized in that: The outer wall of the ejector plate (7) is slidably connected to the inner wall of the mold core (3).

5. A detachable polyurethane sand casting mold according to claim 1, characterized in that: The outer shell (4) has holes inside, and the outer wall of the lifting rod (8) is slidably connected to the inner wall of the outer shell (4).

6. The detachable polyurethane sand casting mold according to claim 1, characterized in that: The outer wall of the guide rail (12) is fixedly connected to the inner wall of the outer shell (4), and the outer wall of the outer shell (4) is fixedly connected to the base (5).

7. A detachable polyurethane sand casting mold according to claim 2, characterized in that: The upper fixing plate (18) has a countersunk hole 1 (21) inside, and the flip cover (17) has a countersunk hole 2 (22) inside.

8. A detachable polyurethane sand casting mold according to claim 2, characterized in that: The upper fixing plate (18) is fixedly connected to the outer wall of the upper template (1), and the lower fixing plate (19) is fixedly connected to the outer wall of the lower template (2).

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