Lost foam mold with impeller blade demolding structure

Abstract

The evanescent mode mold with the impeller blade demolding structure comprises a demolding plate, a lower mold and an upper mold, a plurality of sets of demolding air cylinders are arranged on the demolding plate and used for driving the lower mold to ascend and descend for demolding, the evanescent mode mold further comprises a blade loose piece, a gear, a connecting plate, a sliding shaft, a connecting shaft, a rotating shaft and a first fastener, and a cavity for containing the gear is formed in the lower mold; a plurality of first fasteners which are annularly and evenly distributed with the gear as the center are fixedly arranged on the lower die, a hub of the gear is provided with a plurality of arc-shaped sliding grooves for the first fasteners to penetrate through, and the arc-shaped sliding grooves and the gear are coaxial. The gear and rack structure is additionally arranged, the rack drives the gear to rotate, the gear drives the connecting plate to swing, and then the connecting plate drives the blade loose piece to rotate, retreat and demold, so that full automation of the loose piece is achieved, the structure is simple, few air cylinders are used, and the mold cost is low; the structure mainly solves the problem that all impeller blades are reversely buckled and all loose pieces cannot automatically retreat.

Description

Technical Field

[0001] This application relates to the field of lost foam casting technology, and in particular to a lost foam mold with an impeller blade demolding structure. Background Technology

[0002] Lost foam casting is an advanced casting process. It uses foam plastic molds as models, bonding and assembling foam models similar in size and shape to the casting into a cluster. After being coated with refractory paint and dried, these clusters are embedded in dry silica sand and vibrated to create the model. Under negative pressure, the casting is poured in, causing the model to vaporize. The liquid metal occupies the model's position, and after solidification and cooling, the casting is formed.

[0003] As attached Figure 5 The impeller blades shown in the lost foam casting are inverted. The five blades of the impeller require five movable blocks. The movable blocks are relatively large, making it difficult to achieve fully automatic movable block assembly. The mold structure is also relatively complex. Summary of the Invention

[0004] The purpose of this application is to provide a lost foam mold with an impeller blade demolding structure to solve the above problems. It adds a gear and rack structure, and the rack drives the gear to rotate. The gear drives the blade block to rotate and demold in a fully automated structure. This not only realizes the full automation of the block, but also has a simple structure, uses fewer cylinders, and has a low mold cost. This structure mainly solves the problem that it is impossible to achieve automatic demolding of all blocks when all impeller blades are undercut.

[0005] This application achieves the above objectives through the following technical solutions:

[0006] A lost foam casting mold with an impeller blade demolding structure includes a demolding template, a lower mold, and an upper mold. Multiple demolding cylinders are mounted on the demolding template to drive the lower mold to lift and demold. The mold also includes blade blocks, gears, connecting plates, sliding shafts, connecting shafts, rotating shafts, and first fasteners. The lower mold has a cavity for accommodating the gears. Multiple first fasteners are fixedly mounted on the lower mold and evenly distributed in a ring around the gears. The hub of the gears has multiple arc-shaped grooves through which the first fasteners pass, and the arc-shaped grooves are coaxial with the gears. The gears are connected to a drive assembly that can drive them to rotate. There are at least five connecting plates and blade blocks. The first end of the connecting plate has a core-pulling groove along its length. The hub of the gears has multiple sliding shafts that can pass through the core-pulling grooves and can restrict the blade blocks. The sliding shafts are slidably engaged with the core-pulling grooves. The middle part of the connecting plate is rotatably connected to the end of any blade block away from the impeller center via the connecting shaft. The second end of the connecting plate is rotatably connected to the middle part of the adjacent blade block of the blade block connected to the connecting plate via the rotating shaft.

[0007] Furthermore, the drive assembly includes a core-pulling cylinder and a rack. The core-pulling cylinder is fixedly mounted on the lower mold, and the output end of the core-pulling cylinder is fixedly connected to the end of the rack. The rack meshes with the external teeth of the gear.

[0008] Furthermore, the drive assembly also includes a second fastener and a linear slide. The second fastener is fixedly mounted on the lower mold, and the rack is provided with a linear slide for the second fastener to pass through, and the second fastener slides into the linear slide.

[0009] Furthermore, the connecting plate and blade blocks are evenly distributed in a ring around the gear axis.

[0010] Furthermore, the ends of the first and second fasteners that are away from the lower mold are respectively larger than the widths of the arc-shaped groove and the linear groove.

[0011] Compared to existing technologies, this application adds a gear and rack structure, which drives the gear to rotate, the gear to swing the connecting plate, and then drives the blade block to rotate and retract for demolding. This fully automated structure not only achieves full automation of the block, but also has a simpler structure, uses fewer cylinders, and has lower mold costs. This structure mainly solves the problem that it is impossible to achieve automatic retraction of all the blocks when all impeller blades are overturned. Attached Figure Description

[0012] The accompanying drawings are provided to further illustrate the present application and form part of the specification. They are used together with the following detailed description to explain the present application, but do not constitute a limitation thereof. In the drawings:

[0013] Figure 1 This is a schematic diagram of the inverted structure of this application;

[0014] Figure 2 This is a schematic diagram of the upper mold structure of this application;

[0015] Figure 3 This is a schematic diagram of the core-pulling cylinder structure of this application;

[0016] Figure 4 This is a schematic diagram of the connecting plate structure of this application;

[0017] Figure 5 This is a schematic diagram of the impeller body structure of this application.

[0018] The annotations in the attached figures are explained as follows:

[0019] 1. First impeller body; 2. Second impeller body; 3. Blade; 4. Core-pulling cylinder; 5. Blade block; 6. Demolding cylinder; 7. Demolding template; 8. Lower mold; 9. Rack; 10. Gear; 11. Connecting plate; 12. Sliding shaft; 13. Connecting shaft; 14. Rotating shaft; 15. Upper mold; 16. First fastener; 17. Arc-shaped slide groove; 18. Second fastener; 19. Linear slide groove; 20. Core-pulling slide groove. Detailed Implementation

[0020] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0021] In the description of this application, it should be understood that the terms "upper," "lower," "front," "back," "left," "right," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 This description is provided for the convenience of describing this application and for the purpose of simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0022] like Figure 1-5 As shown, a lost foam casting mold with an impeller blade demolding structure includes a demolding template 7, a lower mold 8, and an upper mold 15. Multiple demolding cylinders 6 are mounted on the demolding template 7 to drive the lower mold 8 to rise and fall for demolding. The mold also includes blade blocks 5, gears 10, connecting plates 11, sliding shafts 12 and 13, rotating shafts 14, and first fasteners 16. The lower mold 8 has a cavity to accommodate the gear 10. Multiple first fasteners 16 are fixedly mounted on the lower mold 8, evenly distributed in a ring around the gear 10. The hub of the gear 10 has multiple arc-shaped grooves 17 through which the first fasteners 16 pass, and these arc-shaped grooves 17 are coaxial with the gear 10. 10 is connected to a drive assembly capable of rotating it. There are at least five connecting plates 11 and blade blocks 5. The first end of the connecting plate 11 is provided with a core-pulling groove 20 along its length direction. Multiple sliding shafts 12 that can pass through the core-pulling groove 20 and restrict the sliding of the blade blocks 5 are fixedly provided on the hub of the gear 10. At the same time, the sliding shafts 12 are slidably engaged with the core-pulling groove 20. The middle part of the connecting plate 11 is rotatably connected to the end of any blade block 5 away from the center of the impeller through the connecting shaft 13. The second end of the connecting plate 11 is rotatably connected to the middle part of the adjacent blade block 5 connected to the connecting plate 11 through the rotating shaft 14.

[0023] Specifically, the shape of the blade block 5 is adapted to the gap between two adjacent blades 3. The gear 10 is restricted by the first fastener 16 to prevent the gear 10 from falling off. At the same time, the gear 10 can rotate under the support of the first fastener 16. After the gear 10 rotates, it drives the connecting plate 11 to swing through the hub. At this time, the connecting plate 11 rotates around the rotating shaft 14. The connecting plate 11 is displaced under the support of the sliding shaft 12. The other end of the connecting plate 11 is linked to the blade block 5 adjacent to the connecting plate 11 through the rotating shaft 14, so that the blade block 5 can be inserted into or withdrawn from the gap between two blades 3.

[0024] Furthermore, the drive assembly includes a core-pulling cylinder 4 and a rack 9. The core-pulling cylinder 4 is fixedly mounted on the lower mold 8, and the output end of the core-pulling cylinder 4 is fixedly connected to the end of the rack 9. The rack 9 meshes with the external teeth of the gear 10.

[0025] Specifically, the core-pulling cylinder 4 extends and retracts to drive the rack 9 to translate. Through the meshing of the teeth of the rack 9 with the outer teeth of the gear 10, the gear 10 can be driven to rotate back and forth, so that the gear 10 can be pulled out or inserted from the gap between the two blades 3 through the linkage of the connecting plate 11 and the blade block 5.

[0026] Furthermore, the drive assembly also includes a second fastener 18 and a linear slide 19. The second fastener 18 is fixedly mounted on the lower mold 8, and the rack 9 is provided with a linear slide 19 through which the second fastener 18 passes, and the second fastener 18 is slidably engaged with the linear slide 19.

[0027] Specifically, the rack 9 can slide on the second fastener 18 when it moves, so that the second fastener 18 supports the rack 9 to move stably and smoothly.

[0028] Furthermore, the connecting plate 11 and the blade block 5 are both evenly distributed in a ring around the axial direction of the gear 10.

[0029] Furthermore, the ends of the first fastener 16 and the second fastener 18 that are away from the lower mold 8 are respectively larger than the widths of the arc-shaped slide 17 and the linear slide 19.

[0030] Specifically, by having the ends of the first fastener 16 and the second fastener 18 that are away from the lower mold 8 larger than the arc-shaped slide groove 17 and the linear slide groove 19, the gear 10 and the rack 9 will not fall off, while supporting the rotation of the gear 10 and the translation of the rack 9.

[0031] In the above structure, during mold closing, the core-pulling cylinder 4 drives the rack 9 to move and reset, the rack 9 meshes and drives the gear 10 to rotate and reset, the gear 10 drives the connecting plate 11 to rotate and reset around the rotating shaft 14 via the sliding shaft 12, the connecting plate 11 drives the blade block 5 to rotate and move and reset around the rotating shaft 14 via the connecting shaft 13, and the demolding cylinder 6 drives the lower mold 8 to move downward and reset, and the upper mold 15 moves downward to close with the lower mold 8; during mold opening, the upper mold 15 moves upward and separates from the lower mold 8 to open the mold, and the demolding cylinder 6 drives the lower mold 8 to move upward. When the lower mold 8 moves, it simultaneously drives the core-pulling cylinder 4, rack 9, first fastener 16 and gear 10 to move upward. Then, the core-pulling cylinder 4 drives the rack 9 to move and mesh, driving the gear 10 to rotate. The gear 10 drives the connecting plate 11 to rotate around the rotating shaft 14 through the sliding shaft 12. The connecting plate 11 drives the blade block 5 to rotate around the rotating shaft 14 through the connecting shaft 13. The blade block 5 moves and disengages from the blade 3, thereby realizing the automatic demolding of the blade block 5. After that, the white mold made of materials such as foam or paraffin can be taken out.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this application. Various changes and modifications can be made to this application without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this application as claimed. The scope of protection of this application is defined by the appended claims and their equivalents.

Claims

1. A lost foam casting mold with an impeller blade demolding structure, comprising a demolding template (7), a lower mold (8), and an upper mold (15), wherein multiple sets of demolding cylinders (6) are disposed on the demolding template (7) for driving the lower mold (8) to rise and fall for demolding, characterized in that: It also includes blade block (5), gear (10), connecting plate (11), sliding shaft (12), connecting shaft (13), rotating shaft (14), and first fastener (16). The lower mold (8) has a cavity for accommodating the gear (10). Multiple first fasteners (16) are fixedly arranged on the lower mold (8) in a ring evenly distributed around the gear (10). Multiple arc-shaped grooves (17) are opened on the hub of the gear (10) for the first fasteners (16) to pass through. The arc-shaped grooves (17) are coaxial with the gear (10). The gear (10) is connected to a drive assembly that can drive its rotation. The connecting plate (11) and blade block (5) Each of the five pieces is at least five. The first end of the connecting plate (11) is provided with a core-pulling groove (20) along its length direction. Multiple sliding shafts (12) that can pass through the core-pulling groove (20) and restrict the blade block (5) are fixedly provided on the hub of the gear (10). At the same time, the sliding shaft (12) is slidably engaged with the core-pulling groove (20). The middle part of the connecting plate (11) is rotatably connected to the end of any blade block (5) away from the center of the impeller through the connecting shaft (13). The second end of the connecting plate (11) is rotatably connected to the middle part of the adjacent blade block (5) of the blade block (5) connected to the connecting plate (11) through the rotating shaft (14).

2. The lost foam casting mold with an impeller blade demolding structure according to claim 1, characterized in that: The drive assembly includes a core-pulling cylinder (4) and a rack (9). The core-pulling cylinder (4) is fixedly installed on the lower mold (8). The output end of the core-pulling cylinder (4) is fixedly connected to the end of the rack (9). The rack (9) meshes with the external teeth of the gear (10).

3. A lost foam casting mold with an impeller blade demolding structure according to claim 2, characterized in that: The drive assembly also includes a second fastener (18) and a linear groove (19). The second fastener (18) is fixedly mounted on the lower mold (8), and the rack (9) is provided with a linear groove (19) through which the second fastener (18) passes. The second fastener (18) slides into the linear groove (19).

4. A lost foam casting mold with an impeller blade demolding structure according to claim 1, characterized in that: The connecting plate (11) and the blade block (5) are evenly distributed in a ring around the gear (10) axis.

5. A lost foam casting mold with an impeller blade demolding structure according to claim 3, characterized in that: The ends of the first fastener (16) and the second fastener (18) that are away from the lower mold (8) are respectively wider than the arc-shaped groove (17) and the linear groove (19).

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