Vacuum sand box for V-process casting

Abstract

The present application relates to V method casting technical field, disclose a kind of vacuum sand box for V method casting, comprising: vacuum sand box body, first exhaust mechanism, moving pipe and second exhaust mechanism, first exhaust mechanism is provided with multiple, first exhaust mechanism is connected with the inner wall of vacuum sand box body, first exhaust mechanism is used to discharge the gas in the inside of vacuum sand box body, to ensure the compactness of sand mould inside vacuum sand box body, moving pipe is slidably arranged in the inside of vacuum sand box body, moving pipe is detachably connected with vacuum sand box body, moving pipe is movable in the inside of vacuum sand box body, to avoid the interference of moving pipe and mould cavity, second exhaust mechanism is provided with multiple, second exhaust mechanism is connected with moving pipe, second exhaust mechanism is used to discharge the gas in the inside of vacuum sand box body, to improve the uniformity of vacuum degree in each place in the inside of vacuum sand box body.The present application can change the position of vacuumizing in sand box, improve the uniformity of vacuum degree in each place in sand box.

Description

Technical Field

[0001] This invention relates to the field of V-process casting technology, and more particularly to a vacuum sand box for V-process casting. Background Technology

[0002] Vacuum casting, also known as negative pressure casting or vacuum casting, involves covering a pattern or template with a heated, plasticized plastic film under vacuum pressure. Dry, unbonded sand is then filled into the mold, and the top surface is sealed with the plastic film. A vacuum is then created to compact the sand, followed by molding, core placement, mold assembly, and pouring until solidification. As an advanced casting process, it is widely used in automotive parts, construction machinery components, and other fields due to its advantages such as high surface quality, good dimensional accuracy, and recyclable sand. In vacuum casting, the vacuum sand box is one of the core pieces of equipment. Its main function is to create negative pressure by extracting air from the sand box, causing the plastic film to adhere tightly to the mold cavity, thus ensuring the compacted molding sand and providing a stable casting environment for subsequent pouring processes.

[0003] However, although the existing vacuum sand box for V-process casting has air extraction ports on all four sides of its inner wall, it can only ensure the compactness of the sand mold around the perimeter, but cannot guarantee the uniformity of the vacuum degree throughout the sand box. This results in inconsistent sand mold compaction. Currently, although the uniformity of the vacuum degree throughout the sand box can be further improved by setting up a crossbeam (which also has an air extraction port) inside the sand box, the crossbeam cannot be moved or disassembled. This causes the crossbeam to sometimes interfere with the mold cavity, affecting the shape of the casting and reducing product quality. Summary of the Invention

[0004] This application discloses a vacuum sand box for V-process casting, which solves the problem in the prior art that the crossbeam cannot be moved or disassembled, and the uniformity of vacuum degree in various parts of the sand box cannot be guaranteed.

[0005] To solve the above problems, the present invention adopts the following technical solution:

[0006] A vacuum sand box for V-process casting, comprising:

[0007] Vacuum sand box body;

[0008] The first exhaust mechanism, which is provided in multiple ways, is connected to the inner wall of the vacuum sand box body. The first exhaust mechanism is used to exhaust the gas inside the vacuum sand box body to ensure the compactness of the sand mold inside the vacuum sand box body.

[0009] The movable tube is slidably disposed inside the vacuum sand box body. The movable tube is detachably connected to the vacuum sand box body and can move within the vacuum sand box body to avoid interference between the movable tube and the cavity.

[0010] The second exhaust mechanism, which is provided in multiple parts, is connected to the moving pipe. The second exhaust mechanism is used to exhaust the gas inside the vacuum sand box body to improve the uniformity of the vacuum degree inside the vacuum sand box body.

[0011] The technical solution adopted in this invention can achieve the following beneficial effects:

[0012] This invention utilizes a movable tube within the vacuum sand box to prevent interference between the tube and the mold cavity. Furthermore, the movement of the tube simultaneously drives the second venting mechanism, ensuring it also avoids interference with the mold cavity. The second venting mechanism simultaneously vents gas from the vacuum sand box. With the cooperation of the first venting mechanism, the uniformity of vacuum throughout the sand box is guaranteed. The detachable structure of the movable tube facilitates periodic replacement of worn parts. Through the coordinated operation of the first venting mechanism, the movable tube, and the second venting mechanism, this invention can change the vacuum position within the sand box, improving the uniformity of vacuum and the compactness of the sand mold. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is one of the overall front cross-sectional structural schematic diagrams disclosed in some embodiments of this application;

[0015] Figure 2 yes Figure 1 Enlarged structural diagram at point A;

[0016] Figure 3 yes Figure 1 Enlarged structural diagram at point B;

[0017] Figure 4 This is one of the overall left-side cross-sectional structural schematic diagrams disclosed in some embodiments of this application;

[0018] Figure 5 yes Figure 4 Enlarged structural diagram at point C;

[0019] Figure 6 This is the second schematic diagram of the overall left-side cross-sectional structure disclosed in some embodiments of this application;

[0020] Figure 7 yes Figure 6Enlarged structural diagram at point D;

[0021] Figure 8 This is a rear view structural diagram of the movable plate disclosed in some embodiments of this application;

[0022] Figure 9 This is a top view schematic diagram of the overall structure disclosed in some embodiments of this application;

[0023] Figure 10 This is a top cross-sectional structural schematic diagram of some embodiments disclosed in this application;

[0024] Figure 11 yes Figure 10 Enlarged structural diagram at point E;

[0025] Figure 12 This is one of the front cross-sectional structural schematic diagrams of the movable tube disclosed in some embodiments of this application;

[0026] Figure 13 This is the second of the front cross-sectional structural schematic diagrams of the movable tube disclosed in some embodiments of this application;

[0027] Figure 14 This is a front view structural schematic diagram of the vacuum sand box body disclosed in some embodiments of this application;

[0028] Figure 15 This is a front cross-sectional structural schematic diagram of the vacuum sand box body disclosed in some embodiments of this application.

[0029] In the picture:

[0030] 100-Vacuum sand box body; 110-Upper sand box; 111-Guide pin; 120-Lower sand box; 121-Insert plate; 130-First air extraction port; 140-Second air extraction port; 150-Air extraction chamber; 160-Air extraction pipe; 170-Tilting shaft; 180-Connector; 190-Lifting lug;

[0031] 200 - First exhaust mechanism; 210 - Mounting plate; 220 - First through hole; 230 - First clamping assembly; 231 - Support plate; 232 - First telescopic rod; 233 - First clamping block; 234 - First elastic element; 235 - Placement groove; 240 - First filter screen;

[0032] 300-Moving tube; 310-Mounting bracket; 311-Slide groove; 312-Sand drop hole; 313-First slot; 320-Second through hole; 330-Second filter screen; 340-Air extraction channel; 350-Moving plate; 351-Third through hole; 352-Second clamping component; 3521-Moving groove; 3522-Second telescopic rod; 3523-Second clamping block; 3524-Second elastic element; 353-First elastic protrusion; 360-Arc-shaped cavity; 361-Second slot;

[0033] 400 - Second exhaust mechanism; 410 - Short suction pipe; 420 - End cap; 430 - Third filter screen;

[0034] 500 - Cooling mechanism; 510 - Liquid inlet pipe; 520 - Liquid outlet pipe; 530 - Cooling assembly; 531 - Rotating rod; 5311 - Second elastic protrusion; 532 - Rotating shaft; 533 - Connecting rod; 534 - First partition; 535 - Second partition; 536 - First liquid chamber; 537 - Second liquid chamber; 538 - Third liquid chamber; 540 - Connecting assembly; 541 - First connector; 542 - Second connector; 543 - Third connector; 544 - Fourth connector; 545 - Hose; 546 - First connecting pipe; 547 - Second connecting pipe; 548 - First connecting pipe; 549 - Second connecting pipe; 550 - Fifth connector. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0036] The terms "first," "second," "third," "fourth," "fifth," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. Furthermore, the words "and / or" in the specification and claims indicate at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0037] The inventive concept of this application is described here:

[0038] During practical use, the inventors discovered that although existing vacuum sand boxes for V-process casting have air extraction ports on all four sides of their inner walls, they can only ensure the compactness of the sand mold around the perimeter, not the uniformity of the vacuum level throughout the sand box. This results in inconsistent sand mold compaction. Currently, although a crossbeam (also equipped with an air extraction port) can be installed inside the sand box to further improve the uniformity of the vacuum level, this crossbeam cannot be moved or disassembled. This can cause the crossbeam to sometimes interfere with the mold cavity, affecting the shape of the casting and reducing product quality. Furthermore, currently, after casting, most castings are left to cool naturally, which is time-consuming and has low production efficiency. Moreover, after use, the molding sand can clog the filter screen, requiring cleaning. If it cannot be cleaned completely, the filter screen needs to be replaced. Existing filter screens are generally large and are usually installed on the inner wall of the sand box using bolts or other connectors. When the filter screen is partially clogged and needs replacement, the entire filter screen needs to be removed, which is cumbersome, time-consuming, and wasteful of the filter screen.

[0039] Based on this, the inventor provides a vacuum sand box for V-process casting, which can change the position of vacuum evacuation within the sand box, improving the uniformity of vacuum degree and the compactness of the sand mold. The crossbeam is movable and detachable, preventing interference between the crossbeam and the mold cavity. A cooling mechanism is also provided, which can move together with the crossbeam. After casting, the casting is rapidly cooled and solidified by the cooling mechanism. Furthermore, the filter screen is easily disassembled and replaced, saving on operating costs. If the filter screen becomes clogged and needs replacement, only the clogged individual screens need to be replaced, eliminating the need to replace the entire filter screen and thus avoiding waste.

[0040] The following is in conjunction with the appendix Figures 1 to 15 The present application provides a detailed description of a vacuum sand box for V-process casting through specific embodiments and application scenarios.

[0041] Reference Figure 1 A vacuum sand box for V-process casting includes: a vacuum sand box body 100, a first exhaust mechanism 200, a moving pipe 300, and a second exhaust mechanism 400.

[0042] Specifically, refer to Figure 14 and Figure 15The vacuum sandbox body 100 includes an upper sandbox 110 and a lower sandbox 120. Both the upper sandbox 110 and the lower sandbox 120 are box-shaped structures. When the boxes are closed, the upper sandbox 110 is stacked on top of the lower sandbox 120. Multiple first air extraction ports 130 are provided around the inner walls of both the upper sandbox 110 and the lower sandbox 120, and a first exhaust mechanism 200 is correspondingly provided with each of the first air extraction ports 130. Second air extraction ports 140 are provided on both sides of the inner walls of both the upper sandbox 110 and the lower sandbox 120 along their width direction (i.e., the second air extraction ports 140 are located on the longer inner walls), and the second air extraction ports 140 correspond to the moving direction of the moving tube 300. In this embodiment, the second air extraction port 140 of the upper sandbox 110... Located above the first air extraction port 130, the second air extraction port 140 of the lower sand box 120 is located below the first air extraction port 130. An air extraction chamber 150, communicating with the first air extraction port 130 and the second air extraction port 140, is provided between the outer and inner walls of the upper sand box 110 and the lower sand box 120. The air extraction chamber 150 is arranged in a ring shape. An air extraction pipe 160, communicating with the air extraction chamber 150, is provided on one side of the outer wall of both the upper sand box 110 and the lower sand box 120. Multiple air extraction pipes 160 can be provided to increase air extraction efficiency. The air extraction pipes 160 can be connected to a vacuum pump via a pipeline, allowing air from the molding sand in the upper sand box 110 and the lower sand box 120 to enter the air extraction chamber 150 through the first air extraction port 130 and the second air extraction port 140. The air is then discharged through the extraction pipe 160, completing the vacuuming process to solidify the molding sand in the upper sand box 110 and lower sand box 120, making the sand mold compact. Tilting shafts 170 are installed on both sides of the outer wall of the upper sand box 110 and lower sand box 120 along their length, facilitating the tilting of the upper sand box 110 and lower sand box 120 using a tilting machine. Lifting lugs 190 are installed on both sides of the outer wall of the upper sand box 110 and lower sand box 120 along their width. In this embodiment, each upper sand box 110 and lower sand box 120 is provided with four lifting lugs 190, with two lifting lugs 190 located on the same side, facilitating the lifting of the upper sand box 110 and lower sand box 120. When the upper sand box 110 and lower sand box 120 are closed, the upper sand box 110 and lower sand box 120... Symmetrical connectors 180 are respectively provided on the outer walls of the two sand boxes 110 and 120, which are close to each other. The connectors 180 are connected by bolts. The connectors 180 are located on both sides of the outer walls of the upper sand box 110 and the lower sand box 120 along their width direction. The upper sand box 110 and the lower sand box 120 are connected together by bolts. Guide pins 111 are installed on both sides of the lower outer wall of the upper sand box 110 along its length direction. The lower part of the guide pin 111 is conical. Insert plates 121 are installed on both sides of the upper outer wall of the lower sand box 120 along its length direction. The center of the insert plate 121 is provided with a positioning hole corresponding to the guide pin 111, which facilitates the guiding and positioning when the upper sand box 110 and the lower sand box 120 are closed.

[0043] Reference Figure 1 and Figure 4Multiple first exhaust mechanisms 200 are provided. The first exhaust mechanism 200 is connected to the inner wall of the vacuum sand box body 100. The first exhaust mechanism 200 is used to exhaust the gas inside the vacuum sand box body 100 to ensure the compactness of the sand mold inside the vacuum sand box body 100.

[0044] Specifically, the first venting mechanism 200 ensures the compactness of the foundation inside the upper sand box 110 and the lower sand box 120, ensuring uniform hardness of the sand mold and effectively avoiding defects such as mold collapse and sand expansion.

[0045] Reference Figure 1 , Figure 4 and Figure 9 The movable tube 300 is slidably disposed inside the vacuum sand box body 100. The movable tube 300 is detachably connected to the vacuum sand box body 100. The movable tube 300 can move within the vacuum sand box body 100 to avoid interference between the movable tube 300 and the cavity.

[0046] Specifically, in this embodiment, the direction of the moving tube 300 is consistent with the width direction of the sand box; by moving the moving tube 300, interference between the moving tube 300 and the cavity is avoided, and the detachable structure of the moving tube 300 facilitates the periodic replacement of worn parts. The moving tube 300 can also play a supporting role to increase the strength of the sand box (referring to the upper sand box 110 and the lower sand box 120, the same below); at least one moving tube 300 is provided in each of the upper sand box 110 and the lower sand box 120. If one moving tube 300 will also cause interference with the cavity, then the moving tube 300 can be omitted; in this embodiment, two moving tubes 300 are provided in each of the upper sand box 110 and the lower sand box 120.

[0047] Reference Figure 1 , Figure 4 and Figure 9 Multiple second exhaust mechanisms 400 are provided. The second exhaust mechanism 400 is connected to the moving pipe 300. The second exhaust mechanism 400 is used to exhaust the gas inside the vacuum sand box body 100 to improve the uniformity of the vacuum degree inside the vacuum sand box body 100.

[0048] Specifically, the second exhaust mechanism 400 is distributed on the four sides of the moving pipe 300, with multiple second exhaust mechanisms 400 on each side. By linking the second exhaust mechanism 400 with the moving pipe 300 for distributed evacuation, compensation can be made for local vacuum weak areas in complex cavities, which can improve the overall vacuum uniformity of the sand mold by 30%-50% and significantly reduce casting defects such as porosity and sand holes. Through the cooperation of the first exhaust mechanism 200, the moving pipe 300 and the second exhaust mechanism 400, the vacuum distribution can be precisely controlled, improving the efficiency of vacuuming, the uniformity of vacuum in various parts of the sand box and the compactness of the sand mold, thus improving practicality.

[0049] Reference Figure 1 , Figure 4 and Figure 10 In this embodiment, the first exhaust mechanism 200 includes a mounting plate 210, a first through hole 220, a first abutting component 230, and a first filter screen 240;

[0050] The mounting plate 210 is connected to the inner wall of the vacuum sand box body 100. The mounting plate 210 has a plurality of first through holes 220. A first abutting component 230 is connected to one side of the mounting plate 210 at the first through hole 220. A first filter screen 240 corresponding to the first through hole 220 is placed inside the first abutting component 230.

[0051] Specifically, the mounting plate 210 corresponds to the first air extraction port 130, and the size of the mounting plate 210 is larger than that of the first air extraction port 130. The mounting plate 210 is connected to the inner wall of the sand box by bolts. A rubber gasket (not shown) is provided between the mounting plate 210 and the inner wall of the sand box to prevent the molding sand in the sand box from entering the first air extraction port 130 through the gap between the mounting plate 210 and the inner wall of the sand box. The shape of the first through hole 220 includes, but is not limited to, circular, oblong, and square. In this embodiment, the shape of the first through hole 220 is oblong. The first through hole 220 communicates with the first air extraction port 130. The first abutting component 230 is disposed in the first air extraction port 130 and extends into the air extraction chamber 150, that is, the mounting plate 210 is provided with... The first clamping component 230 is installed with one side facing the inner wall of the sand box. Multiple sets of the first clamping component 230 are provided, with each first through hole 220 corresponding to one set of the first clamping component 230, so that each first through hole 220 corresponds to one first filter screen 240, reducing the size of the first filter screen 240. The first filter screen 240 can be replaced by the first clamping component 230. The first clamping component 230 and the first filter screen 240 have the same specifications, so they are easy to manufacture. In use and maintenance, the replacement efficiency can be improved by pre-storing spare parts. If the first filter screen 240 is blocked and needs to be replaced, only the blocked first filter screen 240 needs to be replaced.

[0052] By installing mounting plates 210 on all four sides of the inner wall of the sand box corresponding to the first air extraction port 130, a uniform negative pressure gradient is established, avoiding problems such as excessive local air extraction or insufficient air extraction at a distance due to concentrated exhaust, and ensuring uniform initial compactness of the sand mold. The first filter screen 240 covers the first through hole 220, effectively intercepting molding sand particles and preventing sand particles from being sucked into the air extraction chamber 150 or vacuum pump, avoiding malfunctions such as pipe blockage and pump wear. The first clamping component 230 tightly attaches the first filter screen 240 to the first through hole 220 of the mounting plate 210, ensuring that the first filter screen 240 will not shift due to negative pressure suction or mechanical vibration during sand filling or air extraction in the sand box, ensuring that the filter area is completely aligned with the first through hole 220, preventing sand particles from entering the air extraction chamber 150 or vacuum pump, and ensuring the compactness of the sand mold.

[0053] Reference Figure 2 The first clamping component 230 is used to clamp the first filter screen 240 against the mounting plate 210 so that the first filter screen 240 corresponds to the first through hole 220, so that the first filter screen 240 can be replaced.

[0054] Specifically, by removing the mounting plate 210, the first filter screen 240 that needs to be replaced can be quickly replaced, greatly reducing downtime for maintenance. Furthermore, the first filter screen 240 with different pore sizes can be quickly replaced to meet the different requirements of different castings for exhaust speed and filtration accuracy, making the first exhaust mechanism 200 adaptable to diverse production needs.

[0055] Reference Figure 2 , Figure 4 and Figure 10 In this embodiment, the first abutting component 230 includes a support plate 231, a first telescopic rod 232, a first abutting block 233, and a first elastic element 234;

[0056] The support plate 231 is connected to one side of the mounting plate 210 corresponding to the first through hole 220. A first telescopic rod 232 is connected inside the support plate 231. A first abutting block 233 is connected to the end of the first telescopic rod 232 facing the mounting plate 210. A first elastic element 234 is connected between the first abutting block 233 and the support plate 231 and is wound around the first telescopic rod 232.

[0057] Specifically, refer to Figure 2 and Figure 10The support plate 231 can be an integral U-shaped frame or two L-shaped brackets. In this embodiment, the support plate 231 is selected as two L-shaped brackets, and the L-shaped brackets are L-shaped in both cross-section and longitudinal section. The two L-shaped brackets are located on both sides of the first through hole 220. A placement groove 235 for placing the side of the first filter screen 240 is formed between the L-shaped brackets and the mounting plate 210. The first telescopic rod 232, the first abutting block 233, and the first elastic element 234 are all disposed in the placement groove 235. The first telescopic rod 232 is arranged perpendicular to the side of the mounting plate 210. In this embodiment, the upper and lower parts of the L-shaped brackets are each A first telescopic rod 232 is provided to press against the upper and lower parts of the side of the first filter screen 240, thereby improving the pressing effect. One end of the first telescopic rod 232 is connected to the support plate 231, and the other end of the first telescopic rod 232 is connected to a first pressing block 233. The end of the first pressing block 233 near the first filter screen 240 is hemispherical, which facilitates the placement and removal of the first filter screen 240. The first elastic element 234 is preferably a spring. When the first filter screen 240 is not initially placed, the first elastic element 234 is in a compressed state. That is, after the first filter screen 240 is placed, the elastic force of the first elastic element 234 is further enhanced to ensure the pressing effect.

[0058] The first elastic element 234 generates continuous elastic force through its own deformation, driving the first pressing block 233 to press the first filter screen 240 towards the mounting plate 210, continuously providing a stable pressing force to ensure that the first filter screen 240 is always tightly fitted with the first through hole 220 of the mounting plate 210, avoiding gaps; and the first telescopic rod 232 forms a guiding constraint to ensure the effective filtration area of ​​the first filter screen 240, further reducing the risk of sand particles clogging the pipe; and the extension and retraction of the first elastic element 234 can accommodate first filter screens 240 of different thicknesses, enhancing adaptability to different castings and reducing equipment modification costs.

[0059] The first elastic element 234 allows the first pressing block 233 to press against the first filter screen 240, and facilitates the replacement of the first filter screen 240.

[0060] Specifically, refer to Figure 2 When replacing the first filter screen 240, it can be directly pulled upwards and placed. The first filter screen 240 presses against the spherical surface of the first clamping block 233, causing the first clamping block 233 to automatically shift, facilitating the placement of the first filter screen 240, improving maintenance efficiency, reducing downtime for maintenance, and thus improving production efficiency. It also enables timely cleaning or replacement of the first filter screen 240, avoiding a decrease in exhaust efficiency due to clogging, and ensuring that the compactness of the sand mold remains stable.

[0061] Reference Figure 3 , Figure 5, Figure 7 and Figure 11 In this embodiment, a mounting bracket 310 is connected to the inner wall of the vacuum sand box body 100, a moving tube 300 is slidably disposed on the mounting bracket 310, a second through hole 320 is provided on the mounting bracket 310, a second filter screen 330 corresponding to the second through hole 320 is provided between the mounting bracket 310 and the inner wall of the vacuum sand box body 100, and an air extraction channel 340 communicating with the second through hole 320 is provided in the moving tube 300.

[0062] Specifically, refer to Figure 3 , Figure 5 , Figure 7 and Figure 11 The mounting bracket 310 is correspondingly arranged with the second exhaust port 140. The length direction of the mounting bracket 310 is consistent with the length direction of the sand box. Two mounting brackets 310 are arranged in each of the upper sand box 110 and the lower sand box 120. The two mounting brackets 310 are symmetrically arranged on both sides of the inner wall of the sand box. The mounting brackets 310 are arranged in a straight line or T-shape on the inner wall of the sand box. Similarly, the second exhaust port 140 can also be arranged in a straight line or T-shape. In this embodiment, the mounting bracket 310 is arranged in a straight line. The longitudinal section of the mounting bracket 310 is a concave track. The mounting bracket 310 is connected to the inner wall of the sand box by bolts and can bear the weight of the moving pipe 300 and the second exhaust mechanism 400, while resisting the impact force caused by sand filling vibration. The size of the mounting bracket 310 is larger than that of the second exhaust port 140. The second through hole 320 on the mounting bracket 310 corresponds to the second exhaust port 140, and the second through hole 320 is larger than that of the second exhaust port 140. A second filter screen 330 is provided between the hole 320 and the second air extraction port 140, and the size of the second filter screen 330 is larger than that of the second air extraction port 140. That is, the mounting bracket 310 presses the second filter screen 330 between the inner wall of the sand box and the mounting bracket 310. Rubber pads (not shown in the figure) are provided around the side of the mounting bracket 310 near the inner wall of the sand box. The rubber pads (not shown in the figure) are frame-shaped and can be located outside the second filter screen 330. The rubber pads (not shown in the figure) prevent the molding sand in the sand box from entering the second air extraction port 140 through the gap between the mounting bracket 310 and the inner wall of the sand box. When the moving pipe 300 moves, the air extraction channel 340 always remains connected to the second through hole 320 to avoid the interruption of exhaust due to the adjustment of the position of the moving pipe 300. After the mounting bracket 310 is removed, the second filter screen 330 can be replaced, which improves maintenance efficiency.

[0063] Reference Figure 3 , Figure 5 , Figure 7 and Figure 11The mounting frame 310 has a convex groove 311 inside, which facilitates sliding engagement with the moving tube 300. The bottom of the mounting frame 310 has multiple sand-dropping holes 312, which facilitates the discharge of sand particles from the groove 311 when unloading sand, and facilitates the subsequent movement of the moving tube 300. In addition, the mounting frame 310 has multiple first slots 313 on the side wall of the second through hole 320. The multiple first slots 313 are located at the upper and lower parts of the side wall of the second through hole 320, so that the mounting frame 310 can engage with the moving tube 300 and position the moving tube 300 on the mounting frame 310.

[0064] By setting the sliding groove 311 of the mounting bracket 310, the moving tube 300 is supported and guided to move, avoiding the moving tube 300 from getting stuck or deviating due to direct friction with the inner wall of the sand box. This ensures that the moving tube 300 slides smoothly in the preset direction, allowing it to accurately avoid structures such as cavity protrusions and cores, thus completely solving the interference problem.

[0065] Reference Figures 3 to 7 and Figure 14 The gas inside the vacuum sand box body 100 is discharged sequentially through the second exhaust mechanism 400, the air extraction channel 340, and the second through hole 320.

[0066] Specifically, the gas inside the vacuum sand box body 100 is discharged sequentially through the second exhaust mechanism 400, the air extraction channel 340, the second through hole 320, the second air extraction port 140, the air extraction chamber 150 and the air extraction pipe 160.

[0067] Among them, reference Figure 3 , Figure 5 , Figure 7 , Figure 8 and Figure 11 In this embodiment, the two ends of the movable tube 300 are connected to movable plates 350. The movable plates 350 are slidably disposed in the mounting bracket 310. The movable plates 350 are provided with a third through hole 351 that communicates with the air extraction channel 340. A second pressing component 352 is provided on the side of the movable plate 350 near the second filter screen 330. The second pressing component 352 is used to contact the second filter screen 330 to prevent molding sand from entering the third through hole 351 through the second through hole 320.

[0068] Specifically, refer to Figure 3 , Figure 5 , Figure 7 , Figure 8 and Figure 11In this embodiment, the movable tube 300 is square in shape; the movable plate 350 is also square in shape, and the size of the movable plate 350 is larger than the square size of the movable tube 300; the movable plate 350 is slidably disposed in the groove 311 of the mounting frame 310, that is, the movable plate 350 is connected to both ends of the movable tube 300 and slidably disposed in the groove 311 of the mounting frame 310, forming a guide structure with both ends supported, to prevent the movable tube 300 from shifting; the movable plate 350 can be disposed between the two ends of the mounting frame 310 and the side wall in the width direction of the sand box. The gap allows for disassembly, and the movable plate 350 can also be installed through this gap. Multiple first elastic protrusions 353 are provided on the upper and lower parts of the side of the movable plate 350 near the inner wall of the mounting bracket 310. The first elastic protrusions 353 can engage with the first slot 313, which can be hemispherical. Similarly, the first elastic protrusions 353 are also hemispherical, facilitating the engagement and positioning of the movable plate 350 within the slide groove 311. Furthermore, the elasticity of the first elastic protrusions 353 allows the movable plate 350 to... The movable plate 350 moves within the chute 311; the exhaust channel 340 and the third through hole 351 are the same size; rubber pads (not shown) are provided around the perimeter of the movable plate 350 near the inner wall of the mounting bracket 310 to prevent molding sand in the sand box from entering the third through hole 351 through the gap between the movable plate 350 and the inner wall of the mounting bracket 310; the third through hole 351 always remains connected to the second through hole 320 to prevent exhaust interruption caused by the adjustment of the movable plate 350 position; the movable plate 350 is provided with second filters at both ends near the second filter screen 330. The clamping component 352, that is, two second clamping components 352 are provided on a movable plate 350. The second clamping components 352 are located in the second through hole 320 and are in contact with the second filter screen 330. They separate the second through holes 320 on both sides of the third through hole 351 to prevent molding sand from entering the third through hole 351 through the second through hole 320. Preferably, a filter screen (not shown in the figure) can also be provided on the movable plate 350 at the position corresponding to the third through hole 351 to reduce the possibility of molding sand entering the third through hole 351.

[0069] Reference Figures 3 to 8 , Figure 11 and Figure 14 The gas inside the vacuum sand box body 100 is discharged sequentially through the second exhaust mechanism 400, the air extraction channel 340, the third through hole 351, the second through hole 320, the second air extraction port 140, the air extraction chamber 150 and the air extraction pipe 160; through the sliding guide of the moving plate 350 and the dynamic sealing of the second pressing component 352, the moving pipe 300 can still maintain stable exhaust and sand prevention effect when adjusting its position.

[0070] The second abutting component 352 includes a movable groove 3521 formed on the side of the movable plate 350 facing the second filter screen 330. The movable groove 3521 is vertically arranged, and a second telescopic rod 3522 is provided at both the upper and lower parts of the movable groove 3521. The second telescopic rod 3522 is perpendicular to the side of the movable plate 350 facing the second filter screen 330. One end of the second telescopic rod 3522 is connected to the inner wall of the movable groove 3521, and the other end of the second telescopic rod 3522 is connected to the second abutting block 3523. Preferably, two second telescopic rods 3522 are connected to the same second abutting block 3523. The height of the second abutting block 3523 is the same as the height of the second through hole 320. A rubber pad (not shown) is provided at the end of the second abutting block 3523 near the second filter screen 330 to buffer the frictional impact when the movable plate 350 slides and avoid wear of the second filter screen 330 caused by rigid contact. A connecting rod wound around the second through hole 320 is provided between the second abutting block 3523 and the inner wall of the movable groove 3521. The second elastic element 3524 on the telescopic rod 3522, preferably a spring, ensures that the second abutting component 352 moves synchronously with the moving plate 350 when the moving plate 350 slides. The second abutting block 3523 maintains close contact with the second filter screen 330, preventing molding sand from entering the third through hole 351 through the second through hole 320. Preferably, the end of the second abutting block 3523 facing the second filter screen 330 is an isosceles trapezoid. When installing or removing the movable plate 350, the inclined edge of the second abutment block 3523 contacts the side wall of the second through hole 320 (during removal) or the inclined edge of the second abutment block 3523 contacts the side of the mounting bracket 310 (during installation), pressing the second abutment block 3523 towards the movable groove 3521, thereby facilitating the removal or installation of the movable plate 350; when the second abutment block 3523 contacts the second filter screen 330, the second elastic member 3524 is in a compressed state.

[0071] Reference Figure 5 , Figure 7 , Figure 9 and Figure 13 In this embodiment, the second exhaust mechanism 400 includes an air extraction short pipe 410, an end cap 420, and a third filter screen 430;

[0072] The suction short pipe 410 is connected to the moving pipe 300. The end of the suction short pipe 410 away from the moving pipe 300 is detachably connected to the end cap 420 with a central opening. A third filter screen 430 is provided between the suction short pipe 410 and the end cap 420.

[0073] Specifically, refer to Figure 5 , Figure 7 , Figure 9 and Figure 13The inner cavity of the suction short pipe 410 is connected to the suction channel 340; the end cap 420 is threadedly connected to the suction short pipe 410; the third filter screen 430 can be a circular filter screen cut according to the outer diameter of the suction short pipe 410; during suction, the gas in the sand box enters the inner cavity of the suction short pipe 410 through the opening of the end cap 420, and then enters the suction channel 340, and is finally extracted by the vacuum pump; the suction short pipe 410, end cap 420 and third filter screen 430 of each second exhaust mechanism 400 are all the same size, so they are interchangeable. During use and maintenance, the third filter screen 430 can be pre-stored. The 30 method improves replacement efficiency. If the third filter screen 430 becomes clogged and needs to be replaced, the end cap 420 can be unscrewed to quickly replace the third filter screen 430, saving time and effort. Different pore sizes of the third filter screen 430 can also be replaced according to the sand particle size. In addition, the position of the air extraction short pipe 410 can be adjusted synchronously with the moving pipe 300 to avoid cavity interference. By setting the third filter screen 430, sand particles can be prevented from entering the air extraction short pipe 410, thereby preventing sand particles from entering the air extraction channel 340 of the moving pipe 300, reducing wear on the inner wall of the air extraction channel 340, and extending the service life of the components.

[0074] Reference Figure 1 In this embodiment, the vacuum sand box also includes a cooling mechanism 500, which is connected to the vacuum sand box body 100 and the moving pipe 300. The cooling mechanism 500 is used to increase the contact area with the molding sand so that the casting can be cooled and formed quickly.

[0075] Specifically, by adjusting the position of the cooling mechanism 500 driven by the moving pipe 300, precise heat dissipation can be achieved for heat-concentrated areas such as thick-walled areas and deep cavity areas of the casting, ensuring uniform cooling of all areas of the casting. This effectively avoids shrinkage cavities and porosity caused by local overheating, as well as thermal stress cracks caused by excessive temperature differences. Uniform cooling also prevents the molding sand from being in a localized high-temperature state for a long time, reducing thermal expansion and deformation of the molding sand and ensuring the dimensional stability of the sand mold. Furthermore, rapid cooling reduces the high-temperature occupation time of the molding sand and equipment, lowering the energy consumption of the vacuum pump during continuous operation. By moving the moving pipe 300, interference between the second exhaust mechanism 400 and the cooling mechanism 500 and the mold cavity is avoided, and the cooling channel and the exhaust channel 340 do not affect each other, ensuring both exhaust efficiency and vacuum uniformity while achieving cooling and heat dissipation.

[0076] Reference Figure 5 , Figure 7 , Figures 9 to 13 In this embodiment, the cooling mechanism 500 includes an inlet pipe 510, an outlet pipe 520, a cooling assembly 530, and a connecting assembly 540.

[0077] The inlet pipe 510 and the outlet pipe 520 are connected to the vacuum sand box body 100. The cooling component 530 is rotatably connected to the moving pipe 300, and the cooling component 530 is connected to the connecting component 540. One end of the connecting component 540 is connected to the inlet pipe 510, and the other end of the connecting component 540 is connected to the outlet pipe 520.

[0078] Specifically, refer to Figure 9 The inlet pipe 510 and outlet pipe 520 are connected to the outer wall of the sand box. The inlet pipe 510 and outlet pipe 520 are connected by a connecting component 540. The cooling component 530 is connected to the connecting component 540 between the inlet pipe 510 and outlet pipe 520. Coolant enters through the inlet pipe 510, flows through the connecting component 540 to the cooling component 530 on the moving pipe 300, and flows out through the connecting component 540 from the outlet pipe 520. Coolant includes, but is not limited to, water and other liquids with cooling effect (such as antifreeze). A heat exchanger, storage tank and water pump can be installed between the inlet pipe 510 and outlet pipe 520 to allow the coolant to be circulated. Multiple cooling components 530 are provided on one moving pipe 300. In this embodiment, four cooling components 530 are provided on one moving pipe 300, and every two cooling components 530 are rotatably located on both sides of the length direction of the moving pipe 300.

[0079] Reference Figure 7 , Figure 11 and Figure 12 The moving tube 300 has an arc-shaped cavity 360 corresponding to the cooling component 530. The arc-shaped cavity 360 is not connected to the air extraction channel 340. The arc-shaped cavity 360 can be set in the shape of a quarter circle or a semi circle. In this embodiment, the arc-shaped cavity 360 is set in the shape of a quarter circle (that is, the cooling component 530 rotates within the range of 0-90°). In the upper sand box 110, the arc-shaped cavity 360 is located at the lower part of the moving tube 300; in the lower sand box 120, the arc-shaped cavity 360 is located at the upper part of the moving tube 300. A plurality of second slots 361 are provided in the arc-shaped cavity 360. The second slots 361 can engage with the cooling component 530 to position the rotation of the cooling component 530.

[0080] Cooling assembly 530 is used to increase the contact area with molding sand so that the casting can be cooled and formed quickly;

[0081] Specifically, by rotatably connecting the cooling component 530 to the moving tube 300, and combining the sliding function of the moving tube 300, multi-dimensional adjustment of translation and rotation can be achieved, increasing the effective contact area with the molding sand. By expanding the contact area, the cooling component 530 can quickly transfer the cooling capacity of the coolant to the molding sand.

[0082] The connecting assembly 540 is used to deliver coolant to the cooling assembly 530 and to output the heated coolant from the outlet pipe 520.

[0083] Specifically, the coolant enters through the inlet pipe 510, flows through the cooling component 530 on the moving pipe 300 via the connecting component 540, and flows out through the outlet pipe 520 via the connecting component 540, ensuring continuous delivery of coolant and carrying away heat to achieve rapid cooling and forming of the casting.

[0084] Reference Figure 3 , Figure 7 , Figure 9 , Figure 11 and Figure 13The connecting assembly 540 includes a first connector 541 and a fourth connector 544 disposed on both sides of the inner wall of the sand box, i.e., two of each of the first connector 541 and the fourth connector 544 are provided. A second connector 542 and a third connector 543 are connected to both ends of the moving tube 300 along its length, i.e., two of each of the second connector 542 and the third connector 543 are provided. Two first connectors 541 and four connectors 544 form one group, and two second connectors 542 and third connectors 543 form another group. Each group of first connectors 541 and four connectors 544 cooperates with a group of second connectors 542 and third connectors 543. In this embodiment... In the middle, the moving tube 300 is provided with two sets, namely, the first connector 541 and the fourth connector 544 are also provided with two sets; one set of first connector 541 and fourth connector 544 is connected to one set of second connector 542 and third connector 543. One of the first connectors 541 is connected to the liquid inlet pipe 510. The first connector 541 and the second connector 542 are connected by a hose 545. The fourth connector 544 and the third connector 543 are also connected by a hose 545. The other second connector 542 is also connected to the other first connector 541 by a hose 545. A first connecting pipe 548 is installed on the outer wall of the sand box. The other first connector Both 541 and another fourth connector 544 are connected to the first connecting pipe 548 via a pipe (which passes through the outer wall of the sand box). The other fourth connector 544 is also connected to the other third connector 543 via a flexible hose 545. A second connecting pipe 549 is also installed on the outer wall of the sand box. The first connecting pipe 548 and the second connecting pipe 549 are located on opposite sides of the outer wall of the sand box. One of the fourth connectors 544 in each set is connected to the second connecting pipe 549 via a pipe. The second connecting pipe 549 is also equipped with a fifth connector 550. When there is only one moving pipe 300, the excess first connector 541 and fourth connector 544... A cap can be installed to prevent sand particles from entering the joint, and the fifth joint 550 can be used as a liquid outlet pipe 520; if two moving pipes 300 are used, the fifth joint 550 is sealed by the cap, and the two moving pipes 300 can be connected by the second connecting pipe 549 to transport coolant; furthermore, in the moving pipes 300, the second joint 542 and the third joint 543 are both connected to the cooling assembly 530 on the same side of them by the first connecting pipe 546, and the cooling assemblies 530 on the same side are connected to each other by the second connecting pipe 547; the first connecting pipe 546 and the second connecting pipe 547 are located in the air extraction channel 340;The coolant is delivered in the following direction: inlet pipe 510 - one of the first connectors 541 - hose 545 - one of the second connectors 542 - first connecting pipe 546 - cooling assembly 530 - second connecting pipe 547 - cooling assembly 530 - first connecting pipe 546 - another second connector 542 - hose 545 - another first connector 541 - first connecting pipe 548 - another fourth connector 544 - hose 545 - another third connector 543 - first connecting pipe 546 - cooling assembly 530 - second connecting pipe 547 - cooling assembly 530 - first connecting pipe 546 - one of the third connectors 543 - hose 545 - one of the fourth connectors 544 - second connecting pipe 549, then enters another moving pipe 300 for continuous flow, and finally flows out from outlet pipe 520.

[0085] The first connecting pipe 548 and the second connecting pipe 549 may also be provided with heat dissipation fins (not shown in the figure) so that when the liquid passes through the first connecting pipe 548 and the second connecting pipe 549, the heat in the liquid can be dissipated through the heat dissipation fins (not shown in the figure) to improve the subsequent cooling efficiency.

[0086] In fact, the number of moving tubes 300 can be increased by setting more sets of first connectors 541 and fourth connectors 544, and multiple moving tubes 300 can be connected to improve the pumping and cooling efficiency. The specific settings can be made according to the actual situation.

[0087] Reference Figure 3 , Figure 5 , Figure 7 , Figures 9 to 13 In this embodiment, the cooling assembly 530 includes a rotating rod 531, a rotating shaft 532, and a connecting rod 533;

[0088] The rotating rod 531 is snapped into the moving tube 300. Both sides of the rotating rod 531 are rotatably connected to the moving tube 300 through the rotating shaft 532. The rotating shaft 532 is connected to the connecting assembly 540. Multiple connecting rods 533 are connected to both sides of the rotating rod 531.

[0089] Specifically, refer to Figures 11 to 13One end of the rotating rod 531 is located inside the arc-shaped cavity 360. A second elastic protrusion 5311, which engages with the second slot 361, is installed on the side wall of the rotating rod 531 facing the arc-shaped cavity 360. The second slot 361 can be arc-shaped, and similarly, the second elastic protrusion 5311 is also arc-shaped, facilitating the engagement and positioning of the rotating rod 531 within the arc-shaped cavity 360. Furthermore, the elasticity of the second elastic protrusion 5311 allows the rotating rod 531 to rotate within the arc-shaped cavity 360. The two sides of the rotating rod 531 located within the arc-shaped cavity 360 are rotatably connected to the moving tube 300 via a rotating shaft 532. A first liquid chamber 536 is provided inside the rotating shaft 532. The first liquid chamber 536 of one rotating shaft 532 is connected to the first connecting pipe 546, and the first liquid chamber 536 of the other rotating shaft 532 is connected to the second connecting pipe 547. A second liquid chamber 537 is provided inside the rotating rod 531, and the first liquid chamber 536 of the rotating shaft 532 is connected to the second liquid chamber 537. The number of connecting rods 533 can be set according to the actual situation. Multiple connecting rods 533 are symmetrically or staggeredly distributed on the rotating rod 531 to improve the cooling coverage. A third liquid chamber 538 is provided inside the connecting rod 533, and the third liquid chamber 538 is connected to the second liquid chamber 537.

[0090] Rotating rod 531 rotates to change the position of connecting rod 533 inside vacuum sand box body 100, so as to avoid interference between rotating rod 531 and connecting rod 533 and the cavity.

[0091] Specifically, the connecting rod 533 is rotatably connected to the moving tube 300 via the rotating shaft 532, and its posture can be flexibly adjusted around the rotating shaft 532 to avoid interference between the rotating rod 531 and the connecting rod 533 and the cavity. After the connecting rod 533 adjusts its angle with the rotating rod 531, it can be close to the thick-walled area and heat concentration area of ​​the casting for precise cooling.

[0092] Reference Figures 11 to 13 In this embodiment, the cooling assembly 530 further includes a first partition 534 and a second partition 535;

[0093] The first partition 534 is disposed in the inner cavity of the rotating rod 531, and the second partition 535 is disposed in the inner cavity of the connecting rod 533. The second partition 535 is connected to the first partition 534.

[0094] Specifically, the first partition 534 is disposed in the second liquid cavity 537 of the rotating rod 531, dividing the second liquid cavity 537 into a U-shape, and the end of the first partition 534 near the rotating shaft 532 is connected to the inner wall of the second liquid cavity 537; the second partition 535 is disposed in the third liquid cavity 538 of the connecting rod 533, dividing the third liquid cavity 538 into a U-shape, and the end of the second partition 535 near the first partition 534 is located in the second liquid cavity 537, and the second partition 535 is connected to the first partition 534.

[0095] Reference Figures 11 to 13 The first partition 534 and the second partition 535 are used to separate the inner cavities of the rotating rod 531 and the connecting rod 533 so that the coolant flows back to the connecting assembly 540 after passing through each connecting rod 533 in sequence.

[0096] Specifically, the arrangement of the first partition 534 and the second partition 535 forms an orderly flow path. The coolant enters one of the first liquid chambers 536 through the first connecting pipe 546, then enters the second liquid chamber 537, and then sequentially enters the third liquid chamber 538 of the connecting rod 533 on the same side of the rotating rod 531. Specifically, the flow cycle is second liquid chamber 537-third liquid chamber 538-second liquid chamber 537-third liquid chamber 538-second liquid chamber 537-third liquid chamber 538, until the connecting rod 533 on the same side of the rotating rod 531 is completely filled with coolant. Then, the coolant flows sequentially through the second liquid chamber 537 into the third liquid chamber 538 of the connecting rod 533 on the other side of the rotating rod 531, until the coolant has completely flowed through the third liquid chamber 538 of the connecting rod 533. The coolant enters from the second liquid chamber 537 into another first liquid chamber 536, then passes through the second connecting pipe 547, and enters the next cooling assembly 530. This ensures that each connecting rod 533 receives sufficient coolant, achieving uniform heat dissipation throughout the cooling assembly 530. Furthermore, the arrangement of the first baffle 534 and the second baffle 535 extends the coolant flow path, allowing for more thorough heat exchange between the coolant and the connecting rods 533 and molding sand, thus improving overall heat dissipation efficiency. The first baffle 534 and the second baffle 535 effectively improve the bending and torsional resistance of the rotating rod 531 and the connecting rod 533, preventing deformation under sand filling vibration or cooling temperature differences. The orderly flow path reduces coolant flow resistance, thereby reducing the driving energy consumption of the water pump.

[0097] Working principle: Before filling the sand box with sand, the moving tube 300 and the rotating rod 531 are moved and adjusted in advance according to the size of the casting to avoid interference between the moving tube 300, the rotating rod 531 and the connecting rod 533 and the cavity. Then, the upper sand box 110 and the lower sand box 120 are filled with sand and a vacuum is drawn. The gas in the sand box is extracted through the first through hole 220, the second through hole 320 and the short exhaust pipe 410. The gas is finally extracted from the exhaust chamber 150 and the exhaust pipe 160 to achieve uniform vacuum throughout the sand box.

[0098] After the upper sand box 110 and the lower sand box 120 are combined, the casting is carried out. After the casting is completed, the liquid inlet pipe 510 is connected to the water pump to deliver the coolant to the second liquid chamber 537 and the third liquid chamber 538, so that the coolant flows in an orderly manner and achieves rapid cooling and forming of the casting.

[0099] If the filter screen becomes clogged and needs to be replaced, only the clogged individual filter screen needs to be replaced, instead of replacing the entire filter screen. This avoids waste of filter screens and ensures that the compactness of the sand mold remains stable.

[0100] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0101] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A vacuum sand box for V-process casting, characterized in that, include: Vacuum sand box body (100); The first exhaust mechanism (200) is provided in multiple ways. The first exhaust mechanism (200) is connected to the inner wall of the vacuum sand box body (100). The first exhaust mechanism (200) is used to exhaust the gas inside the vacuum sand box body (100) to ensure the compactness of the sand mold inside the vacuum sand box body (100). The movable tube (300) is slidably disposed inside the vacuum sand box body (100). The movable tube (300) is detachably connected to the vacuum sand box body (100). The movable tube (300) is movable within the vacuum sand box body (100) to avoid interference between the movable tube (300) and the cavity. The second exhaust mechanism (400) is provided in multiple ways. The second exhaust mechanism (400) is connected to the moving pipe (300). The second exhaust mechanism (400) is used to exhaust the gas inside the vacuum sand box body (100) to improve the uniformity of the vacuum degree inside the vacuum sand box body (100). A mounting bracket (310) is connected to the inner wall of the vacuum sand box body (100). The moving tube (300) is slidably disposed on the mounting bracket (310). A second through hole (320) is provided on the mounting bracket (310). A second filter screen (330) corresponding to the second through hole (320) is provided between the mounting bracket (310) and the inner wall of the vacuum sand box body (100). An air extraction channel (340) communicating with the second through hole (320) is provided in the moving tube (300). The gas inside the vacuum sand box body (100) is discharged sequentially through the second exhaust mechanism (400), the air extraction channel (340), and the second through hole (320); The second exhaust mechanism (400) includes an air extraction short pipe (410), an end cap (420), and a third filter screen (430). The suction tube (410) is connected to the moving tube (300). The end of the suction tube (410) away from the moving tube (300) is detachably connected to the end cap (420) with a central opening. A third filter screen (430) is provided between the suction tube (410) and the end cap (420). The vacuum sand box also includes a cooling mechanism (500), which is connected to the vacuum sand box body (100) and the moving pipe (300). The cooling mechanism (500) is used to increase the contact area with the molding sand so that the casting can be cooled and formed quickly. The cooling mechanism (500) includes an inlet pipe (510), an outlet pipe (520), a cooling assembly (530), and a connecting assembly (540); The inlet pipe (510) and outlet pipe (520) are connected to the vacuum sand box body (100), the cooling assembly (530) is rotatably connected to the moving pipe (300), and the cooling assembly (530) is connected to the connecting assembly (540). One end of the connecting assembly (540) is connected to the inlet pipe (510), and the other end of the connecting assembly (540) is connected to the outlet pipe (520). The cooling assembly (530) is used to increase the contact area with the molding sand so that the casting can be cooled and formed quickly; The connecting assembly (540) is used to deliver coolant to the cooling assembly (530) and to output the heated coolant from the outlet pipe (520); The cooling assembly (530) includes a rotating rod (531), a rotating shaft (532), and a connecting rod (533). The rotating rod (531) is snapped into the moving tube (300). Both sides of the rotating rod (531) are rotatably connected to the moving tube (300) via rotating shafts (532). The rotating shafts (532) are connected to the connecting assembly (540). Multiple connecting rods (533) are connected to both sides of the rotating rod (531). The rotating rod (531) rotates to change the position of the connecting rod (533) inside the vacuum sand box body (100) to avoid interference between the rotating rod (531) and the connecting rod (533) and the cavity; The movable tube (300) is connected to movable plates (350) at both ends. The movable plates (350) are slidably disposed in the mounting bracket (310). The movable plates (350) are provided with a third through hole (351) communicating with the air extraction channel (340). A second pressing component (352) is provided on the side of the movable plate (350) near the second filter screen (330). The second pressing component (352) is used to contact the second filter screen (330) to prevent molding sand from entering the third through hole (351) through the second through hole (320).

2. The vacuum sand box for V-process casting according to claim 1, characterized in that, The first exhaust mechanism (200) includes a mounting plate (210), a first through hole (220), a first clamping component (230), and a first filter screen (240). The mounting plate (210) is connected to the inner wall of the vacuum sand box body (100). The mounting plate (210) has a plurality of first through holes (220). A first abutting component (230) is connected to one side of the mounting plate (210) at the first through hole (220). A first filter screen (240) corresponding to the first through hole (220) is placed inside the first abutting component (230). The first clamping component (230) is used to clamp the first filter screen (240) against the mounting plate (210) so that the first filter screen (240) corresponds to the first through hole (220) so that the first filter screen (240) can be replaced.

3. The vacuum sand box for V-process casting according to claim 2, characterized in that, The first abutting component (230) includes a support plate (231), a first telescopic rod (232), a first abutting block (233), and a first elastic element (234). The support plate (231) is connected to one side of the mounting plate (210) corresponding to the first through hole (220). A first telescopic rod (232) is connected inside the support plate (231). A first abutting block (233) is connected to one end of the first telescopic rod (232) facing the mounting plate (210). A first elastic element (234) is connected between the first abutting block (233) and the support plate (231) and is wound around the first telescopic rod (232). The first elastic element (234) allows the first abutting block (233) to press against the first filter screen (240), and facilitates the replacement of the first filter screen (240).

4. The vacuum sand box for V-process casting according to claim 1, characterized in that, The cooling assembly (530) also includes a first partition (534) and a second partition (535); The first partition (534) is disposed in the inner cavity of the rotating rod (531), and the second partition (535) is disposed in the inner cavity of the connecting rod (533). The second partition (535) is connected to the first partition (534). The first partition (534) and the second partition (535) are used to separate the inner cavities of the rotating rod (531) and the connecting rod (533) so that the coolant flows back to the connecting assembly (540) after passing through each connecting rod (533) in sequence.

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