Mould for forming a corrosion-resistant pump housing

Abstract

The utility model discloses a kind of corrosion-resistant pump shell forming machining mould, belong to corrosion-resistant pump production technical field.It aims to solve fluorine plastic class corrosion-resistant pump shell forming, thick wall part is prone to shrinkage porosity due to material shrinkage, leading to the problem of shell pressure resistance, corrosion resistance decline.The mould includes upper support, lower support, upper die holder and lower die holder, upper die holder and lower die holder opposite side are provided with die cavity, lower side die cavity bottom is equipped with cylinder block, lower support bottom is provided with sliding slot, sliding slot and die cavity are communicated by connecting groove, the top end of sliding plate slidingly connected in sliding slot is equipped with extruding block with arc slot, lower die holder one side is equipped with the cylinder of driving sliding plate movement.The utility model in the present application, by cylinder drive extruding block in plastic cooling shrinkage stage secondary advance to die cavity, compensate volume shrinkage, while with the help of guiding structure guarantee stable operation, sealing structure prevents material leakage, suitable for the forming processing of corrosion-resistant pump shell, can promote shell material density and forming quality.

Description

Technical Field

[0001] This utility model relates to the field of corrosion-resistant pump manufacturing technology, and in particular to a mold for forming and processing a corrosion-resistant pump housing. Background Technology

[0002] Corrosion-resistant pumps are critical equipment in industries such as chemical, pharmaceutical, electroplating, and metallurgy for conveying corrosive media. Their core component—the pump casing—not only needs to withstand system pressure but, more importantly, must resist the long-term erosion of various corrosive media such as acids, alkalis, and salts. Therefore, the choice of pump casing material, structural integrity, and the quality of its internal surface directly determine the pump's service life and operational reliability.

[0003] Corrosion-resistant pumps typically use fluoroplastic lining (fluorine-lined) or all-plastic structures. Fluoroplastics have a large shrinkage rate, and internal shrinkage cavities are easily generated in thick-walled areas, affecting the pump's pressure resistance and corrosion resistance.

[0004] Therefore, we propose a corrosion-resistant pump housing forming mold. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a corrosion-resistant pump housing forming mold.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A corrosion-resistant pump housing forming mold includes an upper support and a lower support. An upper mold base is fixedly provided at the bottom of the upper support, and a lower mold base is fixedly provided on the surface of the lower support. Mold cavities are provided on opposite sides of the upper and lower mold bases. Four guide sleeves are symmetrically arranged in pairs between the upper support and the upper mold base, and between the lower support and the lower mold base. A cylindrical block is fixedly provided at the bottom of the lower mold cavity. Two sliding grooves are provided at the bottom of the lower support. A connecting groove is connected between the sliding grooves and the mold cavity. A sliding plate is slidably connected in the sliding groove. An extrusion block is integrally formed at the top of the sliding plate. The extrusion block is slidably connected to the connecting groove. An arc-shaped groove is provided on one side of the extrusion block, and the arc-shaped groove is adapted to the mold cavity. The drive mechanism, located on one side of the lower mold base, is used to drive the slide plate.

[0007] In one possible design, the drive mechanism includes a cylinder and a clearance hole. The cylinder is fixed on one side of the lower mold base, and the clearance hole is opened on one side of the lower mold base. The clearance hole is connected to the slide groove, and one end of the cylinder piston rod passes through the clearance hole and is fixed to one side of the slide plate.

[0008] In one possible design, the length of the chute is greater than that of the extrusion block, and the arcuate groove leaves space between itself and the mold cavity in the initial state.

[0009] In one possible design, guide blocks are fixed on both inner walls of the slide, and guide grooves are opened on both sides of the slide plate. The guide blocks and guide grooves are slidably connected, and the side of the guide block away from the mold cavity is chamfered.

[0010] In one possible design, a sealing groove is provided on the outer side of the extrusion block, and a sealing ring is provided inside the sealing groove.

[0011] In one possible design, an injection hole is provided on one side of the upper mold base, and a cooling channel is provided on the inner side of the upper mold base, with the cooling channel surrounding the mold cavity.

[0012] Beneficial effects: In this utility model, the corrosion-resistant pump housing molding die, through the setting of connecting grooves, extrusion blocks and other structures, a movable extrusion block is set at the flange thick wall where shrinkage cavities are prone to occur. After the injection filling is completed and the plastic is cooled and shrinking, the extrusion block is driven by the cylinder to push into the mold cavity a second time, physically extruding the melt to compensate for volume shrinkage and significantly improving the material density. In this utility model, the corrosion-resistant pump housing forming mold, through the setting of structures such as grooves and slide plates, the length of the grooves is greater than that of the extrusion block, which can facilitate the disassembly and assembly of the slide plate and the extrusion block, providing convenience for later maintenance. The guide groove and the guide block can ensure the stable operation of the slide plate, and the sealing ring can improve the sealing between the structures. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall three-dimensional structure of a corrosion-resistant pump housing forming mold proposed in this utility model; Figure 2 This is a partial cross-sectional view of a corrosion-resistant pump housing forming mold proposed in this utility model. Figure 3 This is a partial three-dimensional structural schematic diagram of a corrosion-resistant pump housing forming mold proposed in this utility model.

[0014] In the diagram: 1. Lower support; 2. Lower mold base; 3. Upper support; 4. Upper mold base; 5. Guide sleeve; 6. Mold cavity; 7. Cylindrical block; 8. Slide groove; 9. Connecting groove; 10. Cylinder; 11. Relief hole; 12. Slide plate; 13. Extrusion block; 14. Arc groove; 15. Sealing ring; 16. Guide groove; 17. Guide block; 18. Injection hole; 19. Cooling channel. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] In one embodiment: Refer to Figures 1-3 A molding die for a corrosion-resistant pump housing is provided. The molding die mainly consists of an upper support 3, a lower support 1, an upper mold base 4, a lower mold base 2, and supporting components such as guide sleeves 5, cylindrical blocks 7, sliding plates 12, extrusion blocks 13, and a drive mechanism. The components are assembled in preset positions to form a complete molding structure. The bottom of the upper support 3 is fixedly connected to the upper mold base 4, and the two are fastened with bolts to ensure a stable connection. The lower mold base 2 is installed on the surface of the lower support 1, and the fixed connection method is also used to ensure the structural stability of the mold when it is closed. Mold cavities 6 are respectively opened on opposite sides of the upper mold base 4 and the lower mold base 2. After the two mold cavities 6 are closed, a molding space matching the shape of the corrosion-resistant pump housing is formed. Four guide sleeves 5 are embedded between the upper support 3 and the upper mold base 4, and between the lower support 1 and the lower mold base 2. The four guide sleeves 5 are symmetrically distributed in pairs and play a guiding and positioning role during the mold closing process to prevent the upper mold base 4 and the lower mold base 2 from shifting and to ensure the precise docking of the mold cavities 6. A cylindrical block 7 is fixedly installed at the bottom of the lower mold cavity 6. The cylindrical block 7 and the lower mold base 2 are integrally formed or welded together. Its size is adapted to the corresponding structure inside the corrosion-resistant pump housing, providing support for the internal forming of the pump housing. Two sliding grooves 8 are opened at the bottom of the lower support 1. The sliding grooves 8 are arranged in parallel and correspond to the position of the mold cavity 6. A connecting groove 9 connects the sliding grooves 8 and the mold cavity 6. The width of the connecting groove 9 matches the thickness of the extrusion block 13, ensuring that the extrusion block 13 can pass through smoothly. A sliding plate 12 is slidably connected in the sliding groove 8. The top of the sliding plate 12 is integrally formed with the extrusion block 13. The extrusion block 13 maintains a sliding fit with the connecting groove 9. An arc-shaped groove 14 is opened on one side of the extrusion block 13. The curvature and size of the arc-shaped groove 14 are perfectly adapted to the inner wall contour of the mold cavity 6, so that the extrusion block 13 can form a seamless extrusion surface with the inner wall of the mold cavity 6 when it is pushed in. The drive mechanism is located on one side of the lower mold base 2 and is used to provide driving power for the slide plate 12. The drive mechanism includes a cylinder 10 and a clearance hole 11. The cylinder 10 is fixedly installed on one side of the lower mold base 2 and the cylinder body of the cylinder 10 is fastened to the side of the lower mold base 2 by bolts. The clearance hole 11 is opened on one side of the lower mold base 2. The diameter of the clearance hole 11 is slightly larger than the diameter of the piston rod of the cylinder 10, and the clearance hole 11 is connected to the slide groove 8. One end of the piston rod of the cylinder 10 passes through the clearance hole 11 and is fixedly connected to one side of the slide plate 12. The connection method can be threaded connection or welding to ensure that the piston rod can synchronously drive the slide plate 12 to slide in the slide groove 8 when it extends and retracts. The length of the chute 8 is greater than the length of the extrusion block 13. When the slide plate 12 and the extrusion block 13 need to be disassembled and maintained, the slide plate 12 can be directly pulled out from the end of the chute 8 without disassembling the entire lower mold base 2, which greatly simplifies the maintenance process. The arc groove 14 leaves a certain space between itself and the mold cavity 6 in the initial state. This space is designed to provide sufficient melt accommodation space during the injection filling stage and to prevent the extrusion block 13 from obstructing the melt flow in the initial state. Guide blocks 17 are fixedly installed on both inner walls of the chute 8. Guide grooves 16 are correspondingly opened on both sides of the slide plate 12. The guide blocks 17 and the guide grooves 16 form a sliding fit. The side of the guide block 17 away from the mold cavity 6 is provided with a chamfer. The chamfer structure can guide the guide groove 16 to quickly connect with the guide block 17, while reducing the frictional resistance when the slide plate 12 slides, ensuring that the slide plate 12 runs stably and smoothly in the chute 8 and avoiding jamming or displacement. This application can be used in the field of corrosion-resistant pump production, or in other fields applicable to this application.

[0017] In another embodiment: a corrosion-resistant pump housing forming mold, which is applied to the field of corrosion-resistant pump production. The structure of this embodiment is basically the same as the aforementioned embodiment, except that: In another aspect of this embodiment, a sealing groove is provided on the outer side of the extrusion block 13, and a sealing ring 15 is installed in the sealing groove. The sealing ring 15 fits tightly against the inner wall of the connecting groove 9, which can effectively prevent the melt in the mold cavity from overflowing from the gap between the extrusion block 13 and the connecting groove 9, ensuring the sealing performance during the injection molding process and avoiding leakage problems that affect the product molding quality. An injection hole 18 is provided on one side of the upper mold base 4. The injection hole 18 is connected to the outlet of an external injection molding equipment and is used to inject molten plastic into the mold cavity 6. A cooling channel 19 is provided on the inner side of the upper mold base 4. The cooling channel 19 is arranged around the mold cavity 6, and both ends of the cooling channel 19 are connected to an external cooling system. By circulating cooling water or cooling oil, the cooling and solidification process of the melt in the mold cavity is accelerated. Workflow: First, the upper mold base 4 and the lower mold base 2 are closed. The guide sleeve 5 (which cooperates with the external guide post) ensures that the mold cavity 6 is precisely aligned. At this time, the extrusion block 13 is in the initial position, and the arc groove 14 maintains a preset space with the mold cavity 6. The external injection molding equipment is started, and the molten plastic is injected into the mold cavity 6 through the injection hole 18. The melt flows in the mold cavity 6 and fills the entire molding space, including the area around the cylindrical block 7 and the reserved space between the arc groove 14 and the mold cavity 6. After the melt is filled, the injection molding equipment stops feeding. At this time, the plastic in the mold cavity begins to enter the cooling and shrinkage stage. The cylinder 10 is started, and the piston rod of the cylinder 10 extends, pushing the slide plate 12 to slide along the guide block 17 in the slide groove 8 towards the mold cavity 6. The sliding plate 12 synchronously drives the extrusion block 13 through the connecting groove 9 into the mold cavity. The arc groove 14 of the extrusion block 13 fits against the inner wall of the mold cavity 6 to perform secondary extrusion on the melt. Through physical extrusion, the volume shrinkage generated during the cooling process of the plastic is compensated. Especially for parts such as the thick wall of the corrosion-resistant pump housing flange that are prone to shrinkage cavities, the extrusion action can significantly improve the material density and reduce defects such as shrinkage cavities and porosity. While the extrusion block 13 is in the extrusion state, the cooling medium is introduced through the cooling channel 19 to accelerate the cooling and solidification of the plastic. After the plastic is completely solidified and formed, the piston rod of the cylinder 10 retracts, driving the sliding plate 12 and the extrusion block 13 to reset. Then the upper mold base 4 and the lower mold base 2 open the mold, and the formed corrosion-resistant pump housing product can be taken out.

[0018] However, as is well known to those skilled in the art, the working principle and wiring method of cylinder 10 are conventional means or common knowledge, and will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.

[0019] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0020] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A mold for forming a corrosion-resistant pump housing, comprising an upper support (3) and a lower support (1), wherein an upper mold base (4) is fixedly provided at the bottom of the upper support (3), and a lower mold base (2) is fixedly provided on the surface of the lower support (1), and mold cavities (6) are provided on opposite sides of the upper mold base (4) and the lower mold base (2), and four guide sleeves (5) symmetrically arranged in pairs are embedded between the upper support (3) and the upper mold base (4) and between the lower support (1) and the lower mold base (2), characterized in that: A cylindrical block (7) is fixed at the bottom of the mold cavity (6) located on the lower side. Two sliding grooves (8) are opened at the bottom of the lower support (1). A connecting groove (9) is connected between the sliding groove (8) and the mold cavity (6). A sliding plate (12) is slidably connected in the sliding groove (8). An extrusion block (13) is integrally formed at the top of the sliding plate (12). The extrusion block (13) is slidably connected to the connecting groove (9). An arc groove (14) is opened on one side of the extrusion block (13). The arc groove (14) is adapted to the mold cavity (6). The drive mechanism is located on one side of the lower mold base (2) and is used to drive the slide plate (12).

2. The corrosion-resistant pump housing forming mold according to claim 1, characterized in that, The driving mechanism includes a cylinder (10) and a relief hole (11). The cylinder (10) is fixed on one side of the lower mold base (2), and the relief hole (11) is opened on one side of the lower mold base (2). The relief hole (11) is connected to the slide groove (8). One end of the piston rod of the cylinder (10) passes through the relief hole (11) and is fixed to one side of the slide plate (12).

3. The corrosion-resistant pump housing forming mold according to claim 2, characterized in that, The length of the chute (8) is greater than that of the extrusion block (13), and the arc groove (14) leaves space between itself and the mold cavity (6) in the initial state.

4. The corrosion-resistant pump housing forming mold according to claim 3, characterized in that, Guide blocks (17) are fixed on both sides of the inner wall of the slide (8), and guide grooves (16) are opened on both sides of the slide plate (12). The guide blocks (17) and guide grooves (16) are slidably connected, and the side of the guide block (17) away from the mold cavity (6) is chamfered.

5. The corrosion-resistant pump housing forming mold according to claim 4, characterized in that, The outer side of the extrusion block (13) is provided with a sealing groove, and a sealing ring (15) is provided in the sealing groove.

6. The corrosion-resistant pump housing forming mold according to claim 5, characterized in that, The upper mold base (4) has an injection hole (18) on one side and a cooling channel (19) on the inner side of the upper mold base (4), which surrounds the mold cavity (6).

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