Axially split pump shell casting forming process and equipment

Abstract

The invention discloses an axially split pump shell casting forming process and equipment, and relates to the technical field of casting forming. The core of the equipment is turnover equipment, and the turnover equipment conveys a sand box to a fluted disc station through a movable seat driven by a first motor; a supporting seat driven by a second motor drives an inserting rod to be inserted into inserting grooves of upper and lower supporting plates, so that rigid clamping and fixing of the sand box are realized; and then the third motor drives the fluted disc to synchronously rotate by 180 degrees to drive the locked sand box-supporting plate to integrally and stably turn over, and drawing is completed. The matching process mainly comprises the steps of sand filling and molding, automatic overturning and resetting of a sand box, core manufacturing and setting, box closing and pouring and subsequent treatment which are carried out by utilizing the equipment. According to the invention, the rigidity and multi-point locking of the sand box are realized, no shaking and no impact are ensured in the overturning process, and the shakeout defect caused by traditional hoisting overturning is fundamentally avoided; the whole process is automatically operated, safety and efficiency are achieved, the casting cavity quality and the product percent of pass are remarkably improved, and the device is suitable for stable production of axially split pump shells and other large complex castings.

Description

Technical Field

[0001] This invention relates to the field of casting technology, specifically a casting process and equipment for a split-case pump housing. Background Technology

[0002] As a key pressure-bearing component in industrial fluid transport systems, the quality and performance of the split-case pump casing directly affect the overall pump unit's efficiency, safety, and service life. Currently, large, thin-walled casing components with complex structures and uneven wall thicknesses are mainly produced using sand casting. A crucial and technically challenging step in sand casting is the "mold removal" operation after molding, which requires the complete and stable removal of the mold from the sand-filled and compacted sand box to create a precise cavity for pouring molten metal.

[0003] In existing technologies, the demolding of relatively large sand boxes, such as split-case pump casings, commonly employs a crane (hoist) in conjunction with specialized lifting equipment for hoisting and turning. This traditional method reveals the following significant drawbacks and shortcomings in practical applications: First, the stability is poor, and the risk of sand falling is high. During the lifting, moving, and tilting of the sand box, the crane inevitably experiences swaying, sudden stops, or minor collisions with surrounding equipment. This unstable motion transmits impact and shear forces to the compacted but unsolidified molding sand inside the sand box, easily causing localized sand blocks (especially those around mold edges and raised structures) to loosen and peel off due to mechanical forces, resulting in "sand falling" defects. Sand falling not only damages the integrity of the mold cavity, leading to quality problems such as excess material and scabbing on the surface of subsequently poured castings, but also, if the scattered molding sand enters the cavity, it can create internal defects such as sand inclusions and sand holes, severely reducing the yield and reliability of the castings.

[0004] Secondly, the low operational precision can damage the mold and cavity. Manually operating the crane makes it difficult to achieve precise and uniform turning movements. Excessive turning speed or improper angle control may cause the mold to scrape or squeeze the cavity wall during ejection, damaging the surface finish and dimensional accuracy of the cavity, thus affecting the surface quality and dimensional tolerances of the casting.

[0005] Furthermore, the low level of automation limits production efficiency. The entire hoisting and turning process heavily relies on the experience and skill of the operators, resulting in high labor costs and a slow operating cycle. This makes it difficult to seamlessly integrate with modern, efficient equipment such as automatic molding machines and automatic pouring lines, becoming a bottleneck that restricts the overall efficiency improvement of the casting production line.

[0006] In addition, there are also safety concerns. The heavy sandboxes pose a risk of detachment and tipping over when flipped in the air, endangering on-site equipment and personnel.

[0007] In summary, the core problem with existing hoist-based mold-lifting technology is its inability to provide stable, controllable, and automated rotation of the sand box during this critical process. This is a major reason for frequent casting defects, low production efficiency, and high costs. Therefore, developing a new process and specialized equipment that can replace traditional hoisting methods, achieve stable, precise, and automated sand box rotation to fundamentally avoid sand falling, and integrate with modern casting production lines is of urgent technical necessity and significant practical importance for improving the casting quality and production efficiency of split-case pump housings and similar large and complex castings. Summary of the Invention

[0008] The purpose of this invention is to provide a casting process and equipment for a split-case pump housing in order to facilitate the flipping of the sand box.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a device for casting the shell of a split-case pump, comprising a sand mixer, an automatic molding machine, a turning device, and a sand box. The sand mixer mixes the molding sand evenly, and the automatic molding machine fills the molding sand into a sand box containing a mold. The turning device turns the sand box over, removes the mold, and completes the molding of the outer cavity of the split-case pump shell. The turning device includes a base, with a movable groove at the top. A movable seat is slidably connected to the inner wall of the movable groove. A first motor is installed on the outer wall of the base, and a first threaded rod is connected to the output end of the first motor, passing through the movable seat. A support plate is provided at the top of the movable seat, and a sand box is placed at the top of the support plate. The sand box is turned over by a rotating mechanism, and the support plate is positioned at the top of the movable seat by a positioning mechanism.

[0010] As a further embodiment of the present invention: the rotating mechanism includes a mounting plate, which is symmetrically and fixedly connected to the top of the base. A third motor is mounted on the outer wall of the mounting plate, and the output end of the third motor is connected to a mounting shaft. A spur gear is symmetrically and fixedly connected to the outer wall of the mounting shaft. Gear discs are symmetrically and rotatably connected to both sides of the movable groove at the top of the base. The spur gears are in contact with the gear discs. A displacement groove is formed on the outer wall of the gear disc. A plug rod is slidably connected to the inner wall of the displacement groove. A fixing groove is formed on the inner wall of the displacement groove. An arc-shaped plate is fixedly connected to one end of the plug rod. A second motor is mounted on one side of the base, and the output end of the second motor is connected to a second thread. The rod has a support seat symmetrically slidably connected to its outer wall, and the support seat is slidably connected to the inside of the base. There are two support plates, one of which is located at the top of the movable seat, and the other is located between the two toothed discs. Slots are symmetrically opened on both sides of the support plate. A baffle is fixedly connected to the outer wall of the support plate. A fixing plate extending from the insertion rod is slidably connected inside the insertion rod. A first spring is connected between the fixing plate and the insertion rod. A pressing rod extending from the arc plate is slidably connected inside the arc plate. A displacement frame is fixedly connected to the bottom end of the pressing rod. A second spring is connected between the displacement frame and the arc plate. The bottom end of the displacement frame is in contact with the fixing plate.

[0011] As a further aspect of the present invention: four displacement grooves are provided on each toothed disc, and the four displacement grooves on the same toothed disc are arranged in a rectangular shape. One end of a pair of insert rods in the two upper displacement grooves is connected to an arc plate, and one end of a pair of insert rods in the two lower displacement grooves is connected to another arc plate. The outer arc surfaces of the upper arc plate and the lower arc plate are circular.

[0012] As a further embodiment of the present invention: the positioning mechanism includes a sliding groove, which is symmetrically opened on the outer wall of the support plate away from the baffle. The inner wall of the sliding groove is provided with a positioning groove. A connecting rod is fixedly connected to the outer wall of the support base. One end of the connecting rod is fixedly connected to a horizontal plate. The horizontal plate is slidably connected to the inside of the base and located at the bottom end of the movable groove. A horizontal groove is opened at the top end of the horizontal plate. A positioning frame is symmetrically slidably connected to the inside of the movable base. The positioning frame passes through the movable base. The bottom of the positioning frame is slidably connected to the inner wall of the horizontal groove.

[0013] As a further embodiment of the present invention: the inner wall of the movable groove is in contact with the outer wall of the movable seat, and the outer wall of the movable seat is provided with a first threaded hole, which matches the first threaded rod.

[0014] As a further embodiment of the present invention: the outer wall of the support base is provided with a second threaded hole, the outer wall of the second threaded rod is symmetrically provided with external threads, the external threads are matched with the second threaded hole, and the outer wall of the arc plate is in contact with the top inner wall of the support base.

[0015] As a further embodiment of the present invention: the outer wall of one end of the insertion rod is in contact with the inner wall of the slot; the outer wall of the gear plate is provided with a tooth groove, and the spur gear meshes with the tooth groove.

[0016] As a further embodiment of the present invention: the outer wall of one end of the fixing plate is in contact with the inner wall of the fixing groove, the outer wall of the insertion rod is in contact with the inner wall of the displacement groove, the end of the extrusion rod extending out of the arc plate is provided with a semi-circular surface, the bottom end of the displacement frame is provided with an inclined surface, and the inclined surface is in contact with the fixing plate.

[0017] As a further embodiment of the present invention: the top outer wall of the positioning frame is in contact with the inner wall of the positioning groove, the inner wall of the sliding groove is in contact with the top outer wall of the positioning frame, and the inner wall of the transverse groove is in contact with the bottom outer wall of the positioning frame.

[0018] A casting process for a split-case pump housing includes the following steps: S1. Mold preparation: Make wooden or metal molds and design the gating system and riser feeding system; S2. Sand filling and molding: Place the mold into the sand box placed on the first pallet, fill it with molding sand and compact it to form a casting cavity; S3. Sand Box Tilting and Resetting: The sand box is tilted and reset using a tilting device, specifically including: S3.1 Sand Box Positioning and Fixing: Start the first motor to drive the movable seat to move the first pallet carrying the sand box between the two toothed discs; start the second motor to drive the support seat to move towards each other, and drive the insertion rod to insert into the slots of the first pallet and the opposing second pallet, so as to realize the clamping and fixing of the sand box by the double pallets, and at the same time make the positioning frame disengage from the positioning slot of the first pallet. S3.2 Smooth flipping and demolding: The movable seat retracts; the third motor is started, driving the spur gear to mesh and rotate the gear plate and the tray-sand box fixed by the insert rod as a whole by 180 degrees, and the mold is demolded under the action of gravity; S3.3, Sandbox Unlocking and Removal: The movable seat moves again to the bottom of the first tray that has been flipped down; the second motor reverses, driving the support seat to move backward, causing the insertion rod to exit the slot, releasing the fixation of the tray, and at the same time the positioning frame re-engages into the positioning groove; the movable seat drives the sandbox to move out and return to the initial position; S4. Core making and core placement: Make a sand core and place it into the cavity of the sand box; S5. Closing the sand box, pouring and cooling: Close and secure the sand box, pour molten metal, and control the cooling and solidification. S6. Shaking off and cleaning: Remove the casting by shaking off the sand and clean the surface molding sand, risers and gating points and flash. S7. Heat treatment and machining: Stress-relieving annealing and machining are performed on the castings to achieve the final dimensions and precision.

[0019] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention improves the flipping device, achieving rigid and stable clamping and smooth flipping of the sand box, fundamentally eliminating mechanical sand falling. The rigid connection method, through the precise insertion of the insert rod into the upper and lower support plate slots, ensures that the sand box, support plate, and gear disc form a solid whole. Combined with the synchronous and uniform drive of the gear disc, this ensures that the flipping process is free of shaking and impact, completely eliminating the traditional defect of loosening molding sand due to external impact and guaranteeing the integrity of the mold cavity.

[0020] 2. The flipping operation boasts a high degree of automation, ensuring safe and reliable operation and significantly improving production efficiency. Integrating multiple motors and a linked positioning mechanism, it achieves a fully automated process for sand box conveying, positioning and locking, flipping, and resetting. This design eliminates reliance on manual operation skills, provides stable and controllable operating cycles, reduces operational safety risks, and can efficiently integrate with modern molding and casting production lines.

[0021] 3. Improved equipment significantly enhanced casting quality and process stability. The smooth mold-opening and flipping process protected the surface finish and dimensional accuracy of the mold cavity, significantly reducing defects such as surface scabs, sand inclusions, and internal sand holes. The consistency and reliability of the process were fundamentally improved, increasing product yield and batch stability while reducing the overall cost of rework due to defects. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the flipping device described in this invention; Figure 2 This is a schematic diagram of the internal structure of the base of the flipping device described in this invention; Figure 3 This is a schematic diagram of the installation of the toothed disc in the flipping device of the present invention; Figure 4 This is a schematic diagram of the installation of the spur gear in the flipping device of the present invention; Figure 5 This is a schematic diagram of the internal structure of the toothed disc of the flipping device described in this invention; Figure 6 This is a schematic diagram of the internal structure of the insertion rod of the flipping device described in this invention; Figure 7 This is a schematic diagram of the internal structure of the arc-shaped plate of the flipping device described in this invention; Figure 8 This is a schematic diagram of the structure of the tray of the flipping device described in this invention; Figure 9 This is a schematic diagram of the installation of the horizontal plate of the flipping device described in this invention; Figure 10 This is a schematic diagram of the internal structure of the movable seat and tray of the flipping device described in this invention.

[0023] In the diagram: 1. Base; 2. Movable groove; 3. Movable seat; 4. First motor; 5. First threaded rod; 6. Support plate; 7. Sand box; 8. Rotating mechanism; 801. Mounting plate; 802. Third motor; 803. Mounting shaft; 804. Spur gear; 805. Gear plate; 806. Insert rod; 807. Arc plate; 808. Second motor; 809. Second threaded rod; 810. Support seat; 811. Slot; 812. Baffle; 813. Displacement groove; 814. Fixing groove; 815. Fixing plate; 816. First spring; 817. Displacement frame; 818. Second spring; 819. Pressing rod; 9. Positioning mechanism; 901. Slide groove; 902. Positioning groove; 903. Connecting rod; 904. Horizontal plate; 905. Horizontal groove; 906. Positioning frame. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not 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 invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0026] Please see Figures 1 to 10 In this embodiment of the invention, a device for casting the shell of a split-case pump includes a sand mixer, an automatic molding machine, a turning device, and a sand box 7. After the sand mixer mixes the molding sand evenly, the automatic molding machine fills the molding sand into the sand box 7 containing the mold. The turning device turns the sand box 7 over and removes the mold, thus completing the molding of the outer cavity of the split-case pump shell. The turning device includes a base 1, with a movable groove 2 at the top of the base 1. A movable seat 3 is slidably connected to the inner wall of the movable groove 2. A first motor 4 is installed on the outer wall of the base 1. A first threaded rod 5 is connected to the output end of the first motor 4 and passes through the movable seat 3. A support plate 6 is provided at the top of the movable seat 3, and the sand box 7 is placed at the top of the support plate 6. The sand box 7 is turned over by a rotating mechanism 8, and the support plate 6 is positioned at the top of the movable seat 3 by a positioning mechanism 9.

[0027] In this embodiment: the first motor 4 is started, the first motor 4 drives the first threaded rod 5 to rotate, the first threaded rod 5 rotates and drives the movable seat 3 to move, the movable seat 3 slides in the movable groove 2, and the displacement of the movable seat 3 drives the support plate 6 at the top of the movable seat 3 and the sand box 7 to move synchronously.

[0028] Please refer to this carefully. Figures 3 to 8The rotating mechanism 8 includes a mounting plate 801, which is symmetrically and fixedly connected to the top of the base 1. A third motor 802 is mounted on the outer wall of the mounting plate 801. The output end of the third motor 802 is connected to a mounting shaft 803. A spur gear 804 is symmetrically and fixedly connected to the outer wall of the mounting shaft 803. Gear discs 805 are symmetrically and rotatably connected to both sides of the top of the base 1 at the movable groove 2. The spur gear 804 contacts the gear disc 805. A displacement groove 813 is formed on the outer wall of the gear disc 805. A plug rod 806 is slidably connected to the inner wall of the displacement groove 813. A fixing groove 814 is formed on the inner wall of the displacement groove 813. An arc plate 807 is fixedly connected to one end of the plug rod 806. A second motor 808 is mounted on one side of the base 1. A second threaded rod 809 is connected to the output end of the second motor 808. A support base 810 is symmetrically slidably connected to the outer wall of 809. The support base 810 is slidably connected to the inside of the base 1. Two support plates 6 are provided. One support plate 6 is located at the top of the movable seat 3, and the other support plate 6 is located between the two gear discs 805. Slots 811 are symmetrically opened on both sides of the support plate 6. A baffle 812 is fixedly connected to the outer wall of the support plate 6. A fixing plate 815 extending from the insertion rod 806 is slidably connected inside the insertion rod 806. A first spring 816 is connected between the fixing plate 815 and the insertion rod 806. A pressing rod 819 extending from the arc plate 807 is slidably connected inside the arc plate 807. A displacement frame 817 is fixedly connected to the bottom end of the pressing rod 819. A second spring 818 is connected between the displacement frame 817 and the arc plate 807. The bottom end of the displacement frame 817 is in contact with the fixing plate 815.

[0029] Each gear disc 805 has four displacement grooves 813. The four displacement grooves 813 on the same gear disc 805 are arranged in a rectangular shape. One end of a pair of insert rods 806 in the two upper displacement grooves 813 is connected to an arc plate 807. One end of a pair of insert rods 806 in the two lower displacement grooves 813 is connected to another arc plate 807. The outer arc surfaces of the upper arc plate 807 and the lower arc plate 807 are circular.

[0030] In this embodiment: two support plates 6 are provided. One support plate 6 is located at the top of the movable seat 3, and the other support plate 6 is located between the two gear discs 805 and is fixed by a pair of insert rods 806 (e.g., Figure 2 and Figure 3(As shown); In the initial state, the sand box 7 is placed above the support plate 6 located at the top of the movable seat 3 and in contact with the baffle 812. The displacement of the movable seat 3 causes the support plate 6 and the sand box 7 to move between the two gear plates 805. At this time, the sand box 7 is clamped between the two support plates 6. Then, the second motor 808 is started. The operation of the second motor 808 drives the second threaded rod 809 to rotate. The rotation of the second threaded rod 809 causes the two support seats 810 to move in opposite directions. The displacement of the support seats 810 drives the insertion rod 806 to move through the arc plate 807. The insertion rod 806 is inserted into the slot 811, which is located at the top of the movable seat 3. After the pallet 6 is fixed, the movable seat 3 moves in the opposite direction away from the gear plate 805. The third motor 802 is started, which drives the mounting shaft 803 to rotate. The rotation of the mounting shaft 803 drives the spur gear 804 to rotate, which in turn drives the gear plate 805 to rotate. The rotation of the gear plate 805 drives the pallet 6 to rotate via the insert rod 806, causing the two pallets 6 to exchange positions. At the same time, the two arc-shaped plates 807 that were originally located above rotate to the bottom and enter the support base 810, while the two arc-shaped plates 807 that were originally located below rotate to the top and detach from the support base 810. At this time, the movable seat 3 moves to the bottom of the pallet 6 again, and the second motor 808 is started, which drives the insert rod 806 to move out of the slot 811, releasing the fixation of the pallet 6. The movement of the movable seat 3 drives the pallet 6 and the sand box 7 to move and reset, completing the flipping of the sand box 7.

[0031] When the arc plate 807 is above the support base 810, the fixing plate 815 is engaged into the fixing groove 814 by the elastic force of the first spring 816, fixing the insertion rod 806 in the displacement groove 813, thereby preventing the insertion rod 806 from moving out of the slot 811 and causing the upper support plate 6 to loosen; when the arc plate 807 moves to the top of the support base 810, the pressing rod 819 contacts the inner wall of the support base 810, the pressing rod 819 is displaced by the force, the displacement rod 819 displacement drives the displacement frame 817 to move, compressing the second spring 818, the displacement frame 817 pushes the fixing plate 815 to move, the fixing plate 815 moves out of the fixing groove 814, the fixing of the insertion rod 806 is released, so that the insertion rod 806 can slide in the displacement groove 813.

[0032] Please refer to this carefully. Figures 8 to 10The positioning mechanism 9 includes a slide groove 901, which is symmetrically opened on the outer wall of the support plate 6 away from the baffle 812. The inner wall of the slide groove 901 is provided with a positioning groove 902. The outer wall of the support base 810 is fixedly connected to a connecting rod 903. One end of the connecting rod 903 is fixedly connected to a horizontal plate 904. The horizontal plate 904 is slidably connected to the inside of the base 1 and located at the bottom of the movable groove 2. The top of the horizontal plate 904 is provided with a horizontal groove 905. The inside of the movable base 3 is symmetrically slidably connected to a positioning frame 906, which passes through the movable base 3. The bottom of the positioning frame 906 is slidably connected to the inner wall of the horizontal groove 905.

[0033] In this embodiment: when the movable seat 3 moves the tray 6 between the two gear discs 805, the positioning frame 906 engages in the positioning groove 902, thereby allowing the movable seat 3 and the tray 6 to move synchronously. When the support seat 810 moves and the insertion rod 806 is inserted into the slot 811 to fix the tray 6, the support seat 810 moves and the connecting rod 903 moves, which in turn moves the horizontal plate 904. The horizontal plate 904 moves and the positioning frame 906 moves out of the positioning groove 902. When the movable seat 3 moves away from the gear disc 805 and separates from the tray 6, the bottom of the positioning frame 906 slides in the horizontal groove 905, and the top of the positioning frame 906 slides in the sliding groove 901. When the support seat 810 moves the insertion rod 806 out of the slot 811, the positioning frame 906 is inserted into the positioning groove 902 to fix the movable seat 3 and the tray 6.

[0034] Please refer to this carefully. Figures 1 to 2 The inner wall of the movable groove 2 fits against the outer wall of the movable seat 3. The outer wall of the movable seat 3 is provided with a first threaded hole, which matches the first threaded rod 5.

[0035] In this embodiment: the first motor 4 drives the first threaded rod 5 to rotate, the rotation of the first threaded rod 5 drives the movable seat 3 to move, and the movable seat 3 slides in the movable groove 2.

[0036] Please refer to this carefully. Figures 3 to 8 The outer wall of the support base 810 is provided with a second threaded hole, and the outer wall of the second threaded rod 809 is symmetrically provided with external threads, which match the second threaded hole. The outer wall of the arc plate 807 is in contact with the top inner wall of the support base 810.

[0037] In this embodiment: the second motor 808 drives the second threaded rod 809 to rotate, the rotation of the second threaded rod 809 drives the two support seats 810 to move in opposite directions, and the displacement of the support seats 810 drives the insertion rod 806 to move through the arc plate 807.

[0038] Please refer to this carefully. Figures 3 to 8One end of the insert 806 is fitted with the inner wall of the slot 811.

[0039] In this embodiment: the insertion rod 806 is displaced and inserted into the slot 811 to fix the support plate 6 at the top of the movable seat 3.

[0040] Please refer to this carefully. Figures 3 to 8 The outer wall of the gear disk 805 is provided with tooth grooves, and the spur gear 804 meshes with the tooth grooves.

[0041] In this embodiment: the third motor 802 drives the mounting shaft 803 to rotate, the mounting shaft 803 rotates and drives the spur gear 804 to rotate, and the spur gear 804 rotates and drives the gear disk 805 to rotate.

[0042] Please refer to this carefully. Figures 3 to 8 One end of the outer wall of the fixing plate 815 is in contact with the inner wall of the fixing groove 814, the outer wall of the insertion rod 806 is in contact with the inner wall of the displacement groove 813, the end of the extrusion rod 819 extending out of the arc plate 807 is provided with a semi-circular surface, and the bottom end of the displacement frame 817 is provided with an inclined surface, which is in contact with the fixing plate 815.

[0043] In this embodiment: when the arc plate 807 is above the support base 810, the fixing plate 815 is engaged into the fixing groove 814 by the elastic force of the first spring 816, fixing the insertion rod 806 in the displacement groove 813, thereby preventing the insertion rod 806 from moving out of the slot 811 and causing the upper support plate 6 to loosen; when the arc plate 807 moves to the top of the support base 810, the pressing rod 819 contacts the inner wall of the support base 810, the pressing rod 819 is displaced by the force, the displacement rod 819 displacement drives the displacement frame 817 to move, compressing the second spring 818, the displacement frame 817 pushes the fixing plate 815 to move, the fixing plate 815 moves out of the fixing groove 814, the fixing of the insertion rod 806 is released, so that the insertion rod 806 can slide in the displacement groove 813.

[0044] Please refer to this carefully. Figures 8 to 10 The top outer wall of the positioning frame 906 is in contact with the inner wall of the positioning groove 902, the inner wall of the sliding groove 901 is in contact with the top outer wall of the positioning frame 906, and the inner wall of the transverse groove 905 is in contact with the bottom outer wall of the positioning frame 906.

[0045] In this embodiment: when the movable seat 3 moves the tray 6 between the two gear discs 805, the positioning frame 906 engages in the positioning groove 902, thereby allowing the movable seat 3 and the tray 6 to move synchronously. When the support seat 810 moves and the insertion rod 806 is inserted into the slot 811 to fix the tray 6, the support seat 810 moves and the connecting rod 903 moves, which in turn moves the horizontal plate 904. The horizontal plate 904 moves and the positioning frame 906 moves out of the positioning groove 902. When the movable seat 3 moves away from the gear disc 805 and separates from the tray 6, the bottom of the positioning frame 906 slides in the horizontal groove 905, and the top of the positioning frame 906 slides in the sliding groove 901.

[0046] Working principle: The sand box 7 is placed on top of the support plate 6. The mold is placed into the sand box 7 and filled with molding sand. Then, the movable seat 3 moves the support plate 6 and the sand box 7 between the two gear discs 805. The lower insert rod 806 is inserted into the slot 811 to fix the support plate 6. The fixation between the movable seat 3 and the support plate 6 is automatically released. The movable seat 3 moves away from the gear disc 805. The rotation of the gear disc 805 drives the support plate 6 and the sand box 7 to rotate, flipping the sand box 7. Then, the movable seat 3 moves to the bottom of the support plate 6, and the insert rod 806 moves out of the slot 811 to release the fixation of the support plate 6. At the same time, the movable seat 3 and the support plate 6 are automatically fixed together. The movement of the movable seat 3 drives the support plate 6 and the sand box 7 to reset, which facilitates the flipping of the sand box 7 and ensures the stability of the flipping process, avoiding sand falling.

[0047] A casting process for a split-case pump housing includes the following steps: S1. Mold preparation: Make wooden or metal molds and design the gating system and riser feeding system; S2. Sand filling and molding: Place the mold into the sand box 7 placed on the first pallet 6, fill it with molding sand and compact it to form a casting cavity; S3, Sand Box Tilting and Resetting: The sand box 7 is flipped and reset using a tilting device, specifically including: S3.1 Sandbox Positioning and Fixing: Start the first motor 4 to drive the movable seat 3 to move the first pallet 6 carrying the sandbox 7 between the two toothed discs 805; start the second motor 808 to drive the support seat 810 to move towards each other, causing the insertion rod 806 to be inserted into the slot 811 of the first pallet 6 and the opposite second pallet 6, so as to realize the clamping and fixing of the sandbox 7 by the double pallets, and at the same time, the positioning frame 906 is disengaged from the positioning groove 902 of the first pallet 6; S3.2 Smooth flipping and demolding: The movable seat 3 retracts; the third motor 802 is started, driving the spur gear 804 to mesh and rotate the gear plate 805 and the tray-sand box fixed by the insert rod 806 as a whole by 180 degrees, and the mold is demolded under the action of gravity; S3.3, Sandbox Unlocking and Removal: The movable seat 3 moves again to the bottom of the first tray 6, which has been flipped down; the second motor 808 reverses, driving the support seat 810 to move backward, causing the insertion rod 806 to exit the slot 811, releasing the fixation of the tray 6, and at the same time the positioning frame 906 re-engages into the positioning groove 902; the movable seat 3 drives the sandbox 7 to move out and return to the initial position; S4. Core making and core placement: Make a sand core and place it into the cavity of the sand box 7; S5. Closing the sand box, pouring and cooling: Close and secure the sand box, pour molten metal, and control the cooling and solidification. S6. Shaking off and cleaning: Remove the casting by shaking off the sand and clean the surface molding sand, risers and gating points and flash. S7. Heat treatment and machining: Stress-relieving annealing and machining are performed on the castings to achieve the final dimensions and precision.

[0048] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for casting the casing of a split-case pump, characterized in that, The equipment includes a sand mixer, an automatic molding machine, a turning device, and a sand box (7). The sand mixer mixes the molding sand evenly, and the automatic molding machine fills the molding sand into the sand box (7) containing the mold. The turning device turns the sand box (7) over and removes the mold, thus completing the molding of the outer cavity of the split pump shell. The turning device includes a base (1), the top of which is provided with a movable groove (2). The inner wall of the movable groove (2) is slidably connected to a movable seat (3). The outer wall of the base (1) is equipped with a first motor (4). The output end of the first motor (4) is connected to a first threaded rod (5). The first threaded rod (5) passes through the movable seat (3). The top of the movable seat (3) is provided with a support plate (6). The top of the support plate (6) is placed with a sand box (7). The sand box (7) is turned over by a rotating mechanism (8). The support plate (6) is positioned at the top of the movable seat (3) by a positioning mechanism (9).

2. The equipment for casting the casing of a split-case pump according to claim 1, characterized in that, The rotating mechanism (8) includes a mounting plate (801), which is symmetrically fixedly connected to the top of the base (1). A third motor (802) is mounted on the outer wall of the mounting plate (801). The output end of the third motor (802) is connected to a mounting shaft (803). A spur gear (804) is symmetrically fixedly connected to the outer wall of the mounting shaft (803). A gear disc (805) is symmetrically rotatably connected to both sides of the movable groove (2) at the top of the base (1). The spur gear (804) is... 4) In contact with the gear disc (805), the outer wall of the gear disc (805) is provided with a displacement groove (813), the inner wall of the displacement groove (813) is slidably connected with a plug rod (806), the inner wall of the displacement groove (813) is provided with a fixing groove (814), one end of the plug rod (806) is fixedly connected with an arc plate (807), a second motor (808) is installed on one side of the base (1), the output end of the second motor (808) is connected with a second threaded rod (809), the second threaded rod ( The outer wall of the base (809) is symmetrically slidably connected to a support (810), which is slidably connected to the interior of the base (1). There are two trays (6), one tray (6) is located at the top of the movable seat (3), and the other tray (6) is located between the two gear discs (805). Slots (811) are symmetrically opened on both sides of the tray (6). A baffle (812) is fixedly connected to the outer wall of the tray (6). The interior of the insert rod (806) is slidably connected to an extension rod (806). The fixed plate (815) is connected to the insertion rod (806) by a first spring (816). The inside of the arc plate (807) is slidably connected to a pressing rod (819) extending out of the arc plate (807). The bottom end of the pressing rod (819) is fixedly connected to a displacement frame (817). The displacement frame (817) is connected to the arc plate (807) by a second spring (818). The bottom end of the displacement frame (817) is in contact with the fixed plate (815).

3. The equipment for casting the casing of a split-case pump according to claim 2, characterized in that, Each of the gear discs (805) has four displacement grooves (813). The four displacement grooves (813) on the same gear disc (805) are arranged in a rectangular shape. One end of a pair of insert rods (806) in the two upper displacement grooves (813) is connected to an arc plate (807). One end of a pair of insert rods (806) in the two lower displacement grooves (813) is connected to another arc plate (807). The outer arc surfaces of the upper arc plate (807) and the lower arc plate (807) are circular.

4. The equipment for casting the casing of a split-case pump according to claim 2, characterized in that, The positioning mechanism (9) includes a slide groove (901), which is symmetrically opened on the outer wall of the support plate (6) away from the baffle (812). The inner wall of the slide groove (901) is provided with a positioning groove (902). The outer wall of the support base (810) is fixedly connected with a connecting rod (903). One end of the connecting rod (903) is fixedly connected with a horizontal plate (904). The horizontal plate (904) is slidably connected to the inside of the base (1) and located at the bottom of the movable groove (2). The top of the horizontal plate (904) is provided with a horizontal groove (905). The inside of the movable seat (3) is symmetrically slidably connected with a positioning frame (906). The positioning frame (906) passes through the movable seat (3). The bottom of the positioning frame (906) is slidably connected to the inner wall of the horizontal groove (905).

5. The equipment for casting the casing of a split-case pump according to claim 1, characterized in that, The inner wall of the movable groove (2) is in contact with the outer wall of the movable seat (3), and the outer wall of the movable seat (3) is provided with a first threaded hole, which matches the first threaded rod (5).

6. The equipment for casting the casing of a split-case pump according to claim 2, characterized in that, The outer wall of the support base (810) is provided with a second threaded hole, and the outer wall of the second threaded rod (809) is symmetrically provided with external threads. The external threads match the second threaded hole, and the outer wall of the arc plate (807) is in contact with the top inner wall of the support base (810).

7. The equipment for casting the casing of a split-case pump according to claim 2, characterized in that, The outer wall of one end of the insertion rod (806) fits against the inner wall of the slot (811); the outer wall of the gear disc (805) is provided with a tooth groove, and the spur gear (804) meshes with the tooth groove.

8. The equipment for casting the casing of a split-case pump according to claim 2, characterized in that, One end of the outer wall of the fixing plate (815) is in contact with the inner wall of the fixing groove (814), the outer wall of the insert rod (806) is in contact with the inner wall of the displacement groove (813), the end of the extrusion rod (819) extending out of the arc plate (807) is provided with a semi-circular surface, and the bottom end of the displacement frame (817) is provided with an inclined surface, which is in contact with the fixing plate (815).

9. The equipment for casting the casing of a split-case pump according to claim 4, characterized in that, The top outer wall of the positioning frame (906) is in contact with the inner wall of the positioning groove (902), the inner wall of the sliding groove (901) is in contact with the top outer wall of the positioning frame (906), and the inner wall of the transverse groove (905) is in contact with the bottom outer wall of the positioning frame (906).

10. A casting process for a split-case pump housing according to any one of claims 4-9, characterized in that, Includes the following steps: S1. Mold preparation: Make wooden or metal molds and design the gating system and riser feeding system; S2, Sand filling and molding: Place the mold into the sand box (7) placed on the first pallet (6), fill it with molding sand and compact it to form a casting cavity; S3, Sand box flipping and resetting: The sand box (7) is flipped and reset using a flipping device, specifically including: S3.1 Sandbox Positioning and Fixing: Start the first motor (4) to drive the movable seat (3) to move the first pallet (6) carrying the sandbox (7) between the two gear discs (805); start the second motor (808) to drive the support seat (810) to move towards each other, and drive the insertion rod (806) to insert into the slot (811) of the first pallet (6) and the opposing second pallet (6), so as to realize the clamping and fixing of the sandbox (7) by the double pallets, and at the same time, make the positioning frame (906) disengage from the positioning groove (902) of the first pallet (6). S3.2, Smooth flipping and demolding: The movable seat (3) retracts; the third motor (802) is started, and the spur gear (804) is driven to mesh and rotate the gear plate (805) and the tray-sand box fixed by the insert rod (806) as a whole by 180 degrees, and the mold is demolded under the action of gravity; S3.3, Sandbox Unlocking and Removal: The movable seat (3) moves again to the bottom of the first tray (6) that has been flipped down; the second motor (808) reverses, driving the support seat (810) to move backward, causing the insertion rod (806) to exit the slot (811), releasing the fixation of the tray (6), and at the same time the positioning frame (906) re-engages into the positioning groove (902); the movable seat (3) drives the sandbox (7) to move out and return to the initial position; S4. Core making and core placement: Make a sand core and place it into the cavity of the sand box (7); S5. Closing the sand box, pouring and cooling: Close and secure the sand box, pour molten metal, and control the cooling and solidification. S6. Shaking off and cleaning: Remove the casting by shaking off the sand and clean the surface molding sand, risers and gating points and flash. S7. Heat treatment and machining: Stress-relieving annealing and machining are performed on the castings to achieve the final dimensions and precision.

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