Aluminum alloy molding machine for GIS

Abstract

This invention relates to the field of casting molding technology and discloses an aluminum alloy molding machine for GIS. After the first preliminary compaction, the sand body is positioned slightly higher than the sand box of the aluminum alloy molding machine. Subsequently, the hydraulic mechanism of the aluminum alloy molding machine lifts the pressing plate on the molding machine. The electric telescopic rod of the mounting frame pushes the scraper structure mounting frame horizontally to the right. After the movable scraper body contacts the sand body above the sand box, it rotates around the movable scraper shaft. Simultaneously, the movable scraper roller rolls on the edge of the sand box body of the aluminum alloy molding machine. The roller protrusions cause the movable scraper body to oscillate back and forth, thereby forming wavy grooves on the sand surface by the scraper fixing ball. After the scraper structure mounting frame moves to the far right, the mounting frame resets, and the bottom of the movable scraper adheres to the upper surface of the sand box body of the aluminum alloy molding machine, scraping away excess sand and pushing it into the sand box positioning box. Finally, the hydraulic mechanism drives the pressing plate on the molding machine again for a second final compaction, which helps to improve the compactness of the sand mold.

Description

Technical Field

[0001] This invention relates to the field of casting molding technology, and more particularly to an aluminum alloy molding machine for GIS. Background Technology

[0002] The GIS aluminum alloy molding machine is a specialized piece of equipment used to manufacture large, thin-walled aluminum alloy housings or conductor castings for gas-insulated switchgear. It fills molding sand mixed with resin binder into a sand box containing a mold, and then uses the hydraulic mechanism of the aluminum alloy molding machine to compact the molding sand under high pressure, so that the sand particles accurately replicate the shape of the mold, forming a high-precision cavity that perfectly matches the GIS component. After the compacted sand mold is removed and the box is closed, molten aluminum alloy can be poured in, efficiently producing complex thin-walled castings that meet the requirements of high-voltage insulation and sealing.

[0003] According to Chinese Patent Publication No. CN120961857B, this invention relates to the field of casting molding technology, specifically an aluminum alloy casting sand core molding machine. It includes a base and a column fixedly connected to the rear of the upper surface of the base. A top seat with an upper hydraulic cylinder is rotatably connected to the upper end of the column. A pressure plate is fixedly connected to the lower end of the upper hydraulic cylinder. A support is fixedly connected to the front of the upper surface of the base via a lower hydraulic cylinder. Multiple electric push rods are embedded in the upper surface of the support. A pattern plate with a pattern and rod groove is installed on the upper surface of the support. This invention controls the pattern plate to drive the sand frame to move up and down inside the hopper, allowing the pressure bar to repeatedly beat the coated sand at the upper end of the sand frame. Combined with the hopper's auxiliary material replenishment of the coated sand at the upper end of the sand frame, this results in a more compact and uniform filling of the coated sand within the sand frame, improving the quality of the molded sand. Compared to manual filling, this method is more efficient and convenient.

[0004] The above-mentioned and existing related technologies have the following defects: When traditional molding machines compact large thin-walled GIS sand molds containing metal inserts, the single-compaction method is prone to problems such as poor air venting, resulting in insufficient air cushion pressure, uneven compaction, and poor surface flatness. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that the existing single-compaction method is prone to poor air exhaust, resulting in poor air cushion compression, uneven compaction, and poor surface flatness. To address this, we propose an aluminum alloy molding machine for GIS.

[0006] To achieve the above objectives, this application adopts the following technical solution: an aluminum alloy molding machine for GIS, comprising: a GIS aluminum alloy molding machine body, an aluminum alloy molding machine hydraulic mechanism disposed inside the GIS aluminum alloy molding machine body, a pressing plate lifting platform fixedly connected to the side of the aluminum alloy molding machine hydraulic mechanism, a pressing plate on the molding machine fixedly connected to the bottom of the pressing plate lifting platform, a telescopic rod connecting rod fixedly connected to the bottom of the aluminum alloy molding machine hydraulic mechanism, an electric telescopic rod for mounting bracket fixedly connected to the side of the telescopic rod connecting rod, and a scraper structure fixedly connected to the output end of the electric telescopic rod for mounting bracket. The mounting bracket has a scraper structure return spring fixedly connected inside. The bottom of the scraper structure return spring is fixedly connected to a movable scraper body. The side of the movable scraper body is rotatably connected to a movable scraper shaft. The outer wall of the movable scraper shaft is fixedly connected to a shaft limit block. The outer wall of the movable scraper body is fixedly connected to a scraper fixing ball. The inside of the movable scraper body is rotatably connected to a movable scraper roller. The outer wall of the movable scraper roller is fixedly connected to a roller protrusion. The top of the GIS aluminum alloy molding machine body is fixedly connected to a sand box positioning box. The sand box positioning box contains the aluminum alloy molding machine sand box body.

[0007] Preferably, the movable scraper body and the scraper structure mounting frame are rotatably connected, and the top of the scraper structure mounting frame is triangular.

[0008] Preferably, the scraper structure return springs are evenly spaced within the scraper structure mounting bracket, and the scraper structure return springs serve as a buffer.

[0009] Preferably, the scraper fixing balls are evenly spaced about the outer wall of the movable scraper body, and the scraper fixing balls are hemispherical.

[0010] Preferably, a pair of movable scraper rollers are symmetrically arranged about the vertical central axis of the movable scraper body, and four roller protrusions are arranged at equal angles about the horizontal central axis of the movable scraper rollers.

[0011] Preferably, the scraper roller and roller protrusions play a vibratory role, and the roller protrusions are cylindrical.

[0012] Preferably, the external dimensions of the pressing plate on the molding machine are the same as the internal dimensions of the sand box body of the aluminum alloy molding machine, and the pressing plate on the molding machine and the sand box body of the aluminum alloy molding machine are on the same vertical line.

[0013] Preferably, the roller protrusion causes the movable scraper body to oscillate back and forth around the scraper's movable axis, thereby causing the scraper fixed ball to form wavy grooves on the sand surface.

[0014] Preferably, the sand box body of the aluminum alloy molding machine is located at the center of the sand box positioning box, and the sand box body and the sand box positioning box are detachable.

[0015] Preferably, the sand box positioning box is used to accommodate and position the sand box body of the aluminum alloy molding machine, and the sand box positioning box is used to collect excess molding sand scraped off the upper surface of the sand box body of the aluminum alloy molding machine by the movable scraper body.

[0016] The technical effects and advantages of this invention are as follows: In this invention, the hydraulic mechanism of the aluminum alloy molding machine drives the pressing plate on the molding machine to perform the first preliminary compaction of the sand, making the height of the sand slightly higher than the sand box body of the aluminum alloy molding machine. Subsequently, the hydraulic mechanism of the aluminum alloy molding machine raises the pressing plate on the molding machine, and the electric telescopic rod of the mounting frame pushes the scraper structure mounting frame to move horizontally to the right. After the movable scraper body contacts the sand that is higher than the sand box, it rotates around the movable axis of the scraper. The fixed ball of the scraper presses into the sand, and at the same time, the movable roller of the scraper rolls on the edge of the sand box body of the aluminum alloy molding machine. The roller protrusion makes the movable scraper body reciprocate, so that the fixed ball of the scraper presses into the sand surface. After the wavy grooves are formed and the scraper structure mounting bracket is moved to the far right, the electric telescopic rod of the mounting bracket drives the scraper structure mounting bracket to reset. The scraper structure reset spring pushes the movable scraper body, causing the rotating shaft limit block to return to the standard position. At this time, the bottom of the movable scraper body is in contact with the upper surface of the sand box body of the aluminum alloy molding machine, scraping off the excess sand and pushing it into the sand box positioning box. Finally, the hydraulic mechanism of the aluminum alloy molding machine drives the pressing plate on the molding machine again for a second final compaction, which helps to improve the compactness of the sand mold, the venting performance and the surface flatness, thereby obtaining high-precision and high-quality aluminum alloy castings that meet the requirements of GIS insulation and sealing. Attached Figure Description

[0017] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts: Figure 1 This is a front view structural schematic diagram of the aluminum alloy molding machine of the present invention; Figure 2 This is a schematic diagram of the pressing plate portion of the molding machine of the present invention; Figure 3 This is a schematic diagram of the structure of the electric telescopic rod part of the mounting frame of the present invention; Figure 4 This is a schematic diagram of the scraper structure mounting bracket portion of the present invention; Figure 5 This is a schematic diagram of the structure of the movable scraper body of the present invention; Figure 6 This is a schematic diagram of the structure of the movable scraper body shifting to the right according to the present invention; Figure 7 For the present invention Figure 6 Schematic diagram of the structure at point A; Figure 8This is a schematic diagram of the structure of the movable scraper body shifting to the left according to the present invention; Figure 9 For the present invention Figure 8 A schematic diagram of the structure at point B.

[0018] Legend: 1. GIS aluminum alloy molding machine body; 2. Hydraulic mechanism of aluminum alloy molding machine; 3. Pressing plate lifting platform; 4. Pressing plate on molding machine; 5. Telescopic rod connecting rod; 6. Electric telescopic rod of mounting frame; 7. Scraper structure mounting frame; 8. Scraper structure return spring; 9. Movable scraper body; 10. Scraper movable shaft; 11. Shaft limit block; 12. Scraper fixing ball; 13. Scraper movable roller; 14. Roller protrusion; 15. Sand box positioning box; 16. Aluminum alloy molding machine sand box body. Detailed Implementation

[0019] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0020] According to the embodiments of the present invention, Figures 1 to 9 As shown.

[0021] The GIS aluminum alloy molding machine is a specialized casting equipment used to manufacture large, thin-walled aluminum alloy housings or conductor castings for gas-insulated switchgear. Its workflow is as follows: An automatic sand-adding system quantitatively fills molding sand mixed with resin binder into a sand box containing the mold. Then, the hydraulic mechanism 2 of the aluminum alloy molding machine drives a pressing plate to apply high pressure to the molding sand, compacting it so that the sand particles tightly wrap around the mold and accurately replicate its shape, thus forming a high-precision cavity that perfectly matches the GIS housing. After compaction, the mold-lifting mechanism smoothly and vertically pulls the mold out of the sand mold, obtaining upper and lower sand molds. After closing the mold box, molten aluminum alloy can be poured in, efficiently producing large, complex, thin-walled castings that meet the high-voltage insulation and sealing requirements of GIS.

[0022] Traditional molding machines for large, thin-walled GIS sand molds containing metal inserts typically employ only one high-pressure compaction process. Due to the complex cavities and numerous thin-walled, deep cavities in the sand mold, gas trapped between sand grains cannot be expelled in time during this single rapid compaction process. This trapped gas forms a high-pressure air cushion between the pressure plate and the sand body, preventing the compaction pressure from being effectively transmitted to the deeper layers of the sand, resulting in ineffective pressure distribution. Furthermore, poor venting leads to uneven sand mold compaction, particularly around the metal inserts, where looseness or excessive density is common. This results in inconsistent mold dimensional rebound after demolding and poor surface flatness. These defects directly affect mold assembly accuracy, causing problems such as porosity, deformation, uneven wall thickness, and parting line seams in the casting. Consequently, these defects fail to meet the stringent requirements of GIS products for high-pressure insulation and airtightness. To address this issue, this invention incorporates the following design in an aluminum alloy molding machine for GIS: An aluminum alloy molding machine for GIS includes: a GIS aluminum alloy molding machine body 1, with an aluminum alloy molding machine hydraulic mechanism 2 installed inside the GIS aluminum alloy molding machine body 1. The aluminum alloy molding machine hydraulic mechanism 2 is a transmission device that converts liquid pressure energy into mechanical energy to drive actuators to achieve reciprocating linear motion or oscillation. In this device, it pushes the pressing plate lifting platform 3 and the pressing plate 4 on the molding machine through a hydraulic cylinder to apply precise and controllable high pressure to the molding sand in the sand box, completing the primary initial compaction and secondary final compaction of the sand mold. It is the core power source providing compaction strength. The pressing plate lifting platform 3 is fixedly connected to the side of the aluminum alloy molding machine hydraulic mechanism 2, and the pressing plate 4 on the molding machine is fixedly connected to the bottom of the pressing plate lifting platform 3. A telescopic rod connecting rod 5 is fixedly connected to the bottom of the aluminum alloy molding machine hydraulic mechanism 2, and an electric telescopic rod 6 for mounting bracket is fixedly connected to the side of the telescopic rod connecting rod 5. The electric telescopic rod 6 for mounting bracket is a device that converts the rotational motion of an electric motor into a pushing motion through a transmission mechanism such as a screw. In this device, the electric actuator that performs linear reciprocating motion of the rod has an electric telescopic rod 6 fixed to the side of the telescopic rod connecting rod 5, and its output end connected to the scraper structure mounting frame 7 to drive the movable scraper body 9 to move horizontally. The output end of the electric telescopic rod 6 is fixedly connected to the scraper structure mounting frame 7. The scraper structure return spring 8 is fixedly connected inside the scraper structure mounting frame 7. The bottom of the scraper structure return spring 8 is fixedly connected to the movable scraper body 9. The side of the movable scraper body 9 is rotatably connected to the scraper movable shaft 10. The outer wall of the scraper movable shaft 10 is fixedly connected to the shaft limit block 11. The outer wall of the movable scraper body 9 is fixedly connected to the scraper fixed ball 12. The inside of the movable scraper body 9 is rotatably connected to the scraper movable roller 13. The outer wall of the scraper movable roller 13 is fixedly connected to the roller protrusion 14. The top of the GIS aluminum alloy molding machine body 1 is fixedly connected to the sand box positioning box 15. The sand box positioning box 15 contains the aluminum alloy molding machine sand box body 16.

[0023] The movable scraper body 9 and the scraper structure mounting frame 7 are rotatably connected. The top of the scraper structure mounting frame 7 is triangular. The scraper structure return springs 8 are evenly spaced inside the scraper structure mounting frame 7, and serve as a buffer. The scraper fixing balls 12 are evenly spaced on the outer wall of the movable scraper body 9, and are hemispherical. A pair of movable scraper rollers 13 are symmetrically arranged about the vertical central axis of the movable scraper body 9. Four roller protrusions 14 are evenly spaced about the horizontal central axis of the movable scraper rollers 13, and serve as a vibrator. The roller protrusions 14 are cylindrical. (The last sentence appears to be a separate, unrelated sentence about a molding machine and a pressing plate.) The external dimensions of 4 are the same as the internal dimensions of the aluminum alloy molding machine sand box body 16. The pressing plate 4 on the molding machine and the aluminum alloy molding machine sand box body 16 are on the same vertical line. The roller protrusion 14 causes the movable scraper body 9 to swing back and forth around the scraper movable pivot 10, thereby causing the scraper fixing ball 12 to form wavy grooves on the surface of the sand. The aluminum alloy molding machine sand box body 16 is located at the center of the sand box positioning box 15. The aluminum alloy molding machine sand box body 16 and the sand box positioning box 15 are detachable structures. The sand box positioning box 15 is used to accommodate and position the aluminum alloy molding machine sand box body 16. The sand box positioning box 15 is used to collect the excess molding sand scraped off the upper surface of the aluminum alloy molding machine sand box body 16 by the movable scraper body 9.

[0024] When using the device, the aluminum alloy molding machine sand box body 16 is placed into the designated position of the sand box positioning box 15. Then, the automatic sand feeding system quantitatively fills the molding sand mixed with resin binder into the aluminum alloy molding machine sand box body 16 containing the mold. The aluminum alloy molding machine hydraulic mechanism 2 is activated, which pushes the pressing plate lifting platform 3 and the upper pressing plate 4 of the molding machine to descend. The upper pressing plate 4 of the molding machine performs the first pressing on the sand in the aluminum alloy molding machine sand box body 16. During the first pressing, the position of the upper pressing plate 4 of the molding machine is slightly higher than the standard compaction position. After the first pressing, the height of the sand in the aluminum alloy molding machine sand box body 16 is slightly higher than the height of the sand in the aluminum alloy molding machine sand box body 16. The hydraulic mechanism 2 of the aluminum alloy molding machine drives the pressing plate lifting platform 3 and the pressing plate 4 on the molding machine to rise. After rising to the designated area, the bottom of the movable scraper body 9 and the top of the aluminum alloy molding machine sand box body 16 are on the same horizontal plane. The electric telescopic rod 6 of the mounting frame is activated, and the electric telescopic rod 6 of the mounting frame pushes the scraper structure mounting frame 7 to move horizontally to the right. When the movable scraper body 9 contacts the sand, since the height of the sand is higher than the aluminum alloy molding machine sand box body 16, the movable scraper body 9 rotates clockwise around the scraper movable rotating shaft 10. The scraper fixed ball 12 contacts the sand, and the scraper movable roller 13 and roller protrusion 14 contact the edge of the aluminum alloy molding machine sand box body 16. As the scraper structure mounting frame 7 moves horizontally, the movable scraper roller 13 begins to rotate. Due to the presence of the roller protrusion 14, the movable scraper body 9 reciprocates around the movable scraper shaft 10. At this time, the scraper fixing ball 12 leaves wavy grooves on the sand body. When the scraper structure mounting frame 7 is at its rightmost position, the electric telescopic rod 6 of the mounting frame drives the scraper structure mounting frame 7 to reset. The scraper structure reset spring 8 pushes the movable scraper body 9 to the standard position. In the standard position, the shaft limit block 11 contacts the scraper structure mounting frame 7, and the bottom of the movable scraper body 9 is attached to the upper surface of the aluminum alloy molding machine sand box body 16. When the scraper structure mounting frame 7 resets, the movable scraper body... Body 9 scrapes away excess sand from the sand box body 16 of the aluminum alloy molding machine and pushes it into the sand box positioning box 15. During the entire movement, the tip of the top of the scraper structure mounting frame 7 scrapes the pressing plate 4 on the molding machine to ensure the cleanliness of the pressing plate 4. When the scraper structure mounting frame 7 is in the initial position, the sand in the sand box body 16 of the aluminum alloy molding machine is flush with the sand box body 16. Then, the hydraulic mechanism 2 of the aluminum alloy molding machine is started. The hydraulic mechanism 2 of the aluminum alloy molding machine pushes the pressing plate lifting platform 3 and the pressing plate 4 on the molding machine to descend. The pressing plate 4 on the molding machine performs a second compaction on the sand box body 16 of the aluminum alloy molding machine. After compaction is completed, the device returns to the initial position.

[0025] The hydraulic mechanism 2 of the aluminum alloy molding machine drives the pressing plate 4 on the molding machine to perform the first preliminary compaction of the sand, so that the height of the sand is slightly higher than the sand box body 16 of the aluminum alloy molding machine. Then, the hydraulic mechanism 2 of the aluminum alloy molding machine lifts the pressing plate 4 on the molding machine. The electric telescopic rod 6 of the mounting frame pushes the scraper structure mounting frame 7 to move horizontally to the right. After the movable scraper body 9 contacts the sand that is higher than the sand box, it rotates around the movable scraper shaft 10. The fixed ball 12 of the scraper presses into the sand. At the same time, the movable roller 13 of the scraper rolls on the edge of the sand box body 16 of the aluminum alloy molding machine. The roller protrusion 14 makes the movable scraper roll... The plate body 9 reciprocates, thereby forming wavy grooves on the sand surface by the scraper fixing ball 12. After the scraper structure mounting frame 7 moves to the far right, the electric telescopic rod 6 of the mounting frame drives the scraper structure mounting frame 7 to reset. The scraper structure reset spring 8 pushes the movable scraper body 9, causing the rotating shaft limit block 11 to return to the standard position. At this time, the bottom of the movable scraper body 9 is in contact with the upper surface of the aluminum alloy molding machine sand box body 16, scraping off the excess sand and pushing it into the sand box positioning box 15. Finally, the hydraulic mechanism 2 of the aluminum alloy molding machine drives the pressing plate 4 on the molding machine again for the second final compaction.

[0026] After the first compaction, the sand body is slightly higher than the sand box, providing a margin for subsequent vibration and leveling. When the movable scraper body 9 moves to the right, the mechanical vibration generated by the sliding roller 13 and roller protrusion 14 rolling on the edge of the sand box drives the fixed ball 12 of the scraper to press out corrugated grooves on the surface of the sand body. The curvature of the corrugated grooves also enhances the mechanical interlock between the upper and lower sand layers, preventing layer peeling during demolding. When moving to the left to reset, the movable scraper scrapes off the excess sand body with the cooperation of the reset spring and the limit block, ensuring that the sand surface is precisely flush with the upper surface of the sand box, providing an ideal flat surface for the second compaction. After the second final compaction, the sand mold has uniform compaction, a flat surface, and thorough venting, which can efficiently obtain high-precision, high-quality aluminum alloy thin-walled castings that meet the high-voltage insulation and sealing requirements of GIS.

[0027] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. An aluminum alloy molding machine for GIS, characterized in that, include: The GIS aluminum alloy molding machine body includes an internal hydraulic mechanism. A pressing plate lifting platform is fixedly connected to the side of the hydraulic mechanism, and a pressing plate is fixedly connected to the bottom of the pressing plate lifting platform. A telescopic rod is fixedly connected to the bottom of the hydraulic mechanism, and an electric telescopic rod for mounting brackets is fixedly connected to the side of the telescopic rod. A scraper structure mounting bracket is fixedly connected to the output end of the electric telescopic rod, and a scraper is fixedly connected inside the scraper structure mounting bracket. The structure includes a return spring, with a movable scraper body fixedly connected to its bottom. A movable scraper shaft is rotatably connected to the side of the movable scraper body. A shaft limiting block is fixedly connected to the outer wall of the movable scraper shaft. A scraper fixing ball is fixedly connected to the outer wall of the movable scraper body. A movable scraper roller is rotatably connected inside the movable scraper body. A roller protrusion is fixedly connected to the outer wall of the movable scraper roller. A sand box positioning box is fixedly connected to the top of the GIS aluminum alloy molding machine body. The sand box positioning box contains the aluminum alloy molding machine sand box body.

2. The aluminum alloy molding machine for GIS according to claim 1, characterized in that: The movable scraper body and the scraper structure mounting frame are rotatably connected, and the top of the scraper structure mounting frame is triangular.

3. The aluminum alloy molding machine for GIS according to claim 1, characterized in that: The scraper structure return springs are evenly spaced within the scraper structure mounting bracket, and the scraper structure return springs serve as a buffer.

4. The aluminum alloy molding machine for GIS according to claim 1, characterized in that: The scraper fixing balls are evenly spaced about the outer wall of the movable scraper body, and the scraper fixing balls are hemispherical.

5. The aluminum alloy molding machine for GIS according to claim 1, characterized in that: The scraper's movable rollers are arranged symmetrically about the vertical central axis of the movable scraper body in a pair, and the roller protrusions are arranged at equal angles about the horizontal central axis of the scraper's movable rollers in four pairs.

6. The aluminum alloy molding machine for GIS according to claim 1, characterized in that: The scraper roller and roller protrusions provide a vibratory effect, and the roller protrusions are cylindrical in shape.

7. The aluminum alloy molding machine for GIS according to claim 1, characterized in that: The external dimensions of the pressing plate on the molding machine are the same as the internal dimensions of the sand box body of the aluminum alloy molding machine, and the pressing plate on the molding machine and the sand box body of the aluminum alloy molding machine are on the same vertical line.

8. The aluminum alloy molding machine for GIS according to claim 1, characterized in that: The roller protrusion causes the movable scraper body to oscillate back and forth around the scraper's movable axis, thereby causing the scraper fixed ball to form wavy grooves on the sand surface.

9. The aluminum alloy molding machine for GIS according to claim 1, characterized in that: The sand box body of the aluminum alloy molding machine is located at the center of the sand box positioning box, and the sand box body and the sand box positioning box are detachable.

10. The aluminum alloy molding machine for GIS according to claim 1, characterized in that: The sand box positioning box is used to accommodate and position the sand box body of the aluminum alloy molding machine, and the sand box positioning box is used to collect excess molding sand scraped off the upper surface of the sand box body of the aluminum alloy molding machine by the movable scraper body.

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