A sand core preparation apparatus

Abstract

The application discloses a sand core preparation equipment and relates to the technical field of casting equipment. The equipment comprises a first transfer device, a second transfer device and a core making device. The first transfer device comprises a first transfer track and a mold changing trolley. The second transfer device comprises a second transfer track, a transfer platform and a turnover assembly. The first transfer track is arranged perpendicularly to the second transfer track. The turnover assembly is arranged on the transfer platform and comprises a turnover driving member and a turnover frame. The turnover frame has an extension. The turnover driving member drives the turnover frame to rotate so as to transfer a lower mold on the mold changing trolley to the transfer platform. The core making device is arranged above the transfer platform. The vertical transfer track cooperates with the turnover assembly to realize automatic and stable receiving and accurate positioning of the lower mold. The mold closing, sand shooting, solidifying, mold opening and ejection functions are integrated in one system, so that the automation degree, process continuity and production efficiency of the sand core preparation are remarkably improved.

Description

Technical Field

[0001] This application relates to the field of casting equipment technology, and in particular to a sand core preparation device. Background Technology

[0002] Sand cores are crucial components used in the casting process to form the internal cavities of castings. Their preparation quality and efficiency directly affect the precision, complexity, and production cost of the castings. Sand cores are widely used in the production of large and complex castings in fields such as automotive engines, construction machinery, and aerospace.

[0003] Traditional sand core preparation mainly employs a core box forming process, including sand injection, compaction, curing, and core removal from the mold. With the increasing size and integration of castings, the volume and weight of sand cores and core boxes have significantly increased, reaching several tons to tens of tons, posing a challenge to traditional preparation methods.

[0004] Currently, the transfer of large core boxes mostly relies on overhead cranes. This method requires a large operating space and heavy equipment, resulting in a large footprint and high costs; operation depends on manual labor, has poor positioning accuracy, and a slow production cycle; moreover, hoisting poses safety hazards and is difficult to integrate with automated production lines. In addition, the transfer of core boxes between different processes is not smooth, resulting in a lot of waiting time, which restricts overall efficiency and increases mold wear.

[0005] Therefore, there is an urgent need for a high-efficiency, safe, and automated large-scale sand core preparation equipment to solve the technical problems of automated core box transfer, precise positioning, rapid mold opening and closing, and efficient integration with the core making process. Summary of the Invention

[0006] The purpose of this invention is to provide a sand core preparation device to solve the problems of low core box transfer efficiency, poor positioning accuracy, insufficient process continuity, and safety and efficiency issues caused by reliance on manual operation in the preparation of large sand cores.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A sand core preparation device includes a first transfer device, a second transfer device, and a core-making device. The first transfer device includes a first transfer track and a mold-changing trolley that can move along the first transfer track. The second transfer device includes a second transfer track, a transfer platform that can move along the second transfer track, and a flipping assembly. The first transfer track is perpendicular to the second transfer track. The flipping assembly is disposed on the transfer platform. The flipping assembly includes a flipping drive and a flipping frame hinged to the transfer platform. The flipping frame has an extension extending toward the first transfer device. The flipping drive is used to drive the flipping frame to rotate, so as to transfer the lower mold located on the mold-changing trolley to the transfer platform. The core-making device is disposed above the transfer platform.

[0008] By adopting the above technical solution, through the first and second transfer tracks arranged perpendicularly to each other and the flipping components set on the transfer platform, the large lower mold is automatically and smoothly received and turned from the supply line to the processing line, replacing the traditional inefficient and dangerous hoisting method, and providing a foundation for the subsequent automated core-making process.

[0009] Furthermore, the flipping drive component is a flipping cylinder, which is connected to the flipping frame to drive the flipping frame to rotate around the hinge point.

[0010] The above technical solution uses a cylinder as the driving component, which has a simple structure, reliable operation, and is easy to automate.

[0011] Furthermore, a material receiving sensor is provided at the end of the first transfer track near the second transfer device; the mold changing trolley is provided with a set of wheels at its bottom, and the mold changing trolley is supported on the first transfer track by the set of wheels.

[0012] By adopting the above technical solution, the incoming material sensor can accurately detect the arrival status of the mold changing trolley, and the walking wheel set ensures that the trolley moves smoothly and stably, together ensuring the accuracy and reliability of the lower mold supply.

[0013] Furthermore, the second transfer device also includes a drive module for driving the transfer platform to move along the second transfer track; the bottom of the transfer platform is provided with a slider, and the transfer platform is connected to the second transfer track through the slider.

[0014] By adopting the above technical solution, the transfer platform can be precisely positioned and moved by the drive module, and the slider and the track provide stable guidance and load-bearing.

[0015] Furthermore, the second transfer device also includes a first clamping assembly for fixing the lower mold. The first clamping assembly includes two sets of gripper units symmetrically arranged on opposite sides of the transfer platform. Each set of gripper units includes a clamping cylinder and two opposing grippers. The middle part of the gripper is hinged to the side wall of the transfer platform via a pivot. The upper part of the gripper is a clamping part that can extend out of the top surface of the transfer platform. The cylinder body and piston rod end of the clamping cylinder are respectively connected to the lower parts of the two grippers.

[0016] By adopting the above technical solution, the first clamping component can firmly lock the lower mold from both sides, preventing it from shifting in subsequent processes and ensuring the stability and accuracy of the mold closing and core making processes.

[0017] Furthermore, the second transfer device also includes a lifting mechanism, which is installed on the lower or side frame of the transfer platform. The lifting mechanism includes a lifting cylinder and a lifting rod driven by the lifting cylinder, and the top of the lifting rod is provided with multiple rubber wheels.

[0018] By adopting the above technical solution, the lifting mechanism can smoothly support, lower and lift the upper mold, and the rubber wheels avoid damage to the mold caused by rigid contact, thus realizing safe and stable automatic mold closing and opening.

[0019] Furthermore, the second transfer device also includes an intermediate transfer track, which is located in the gap between the mold changing trolley and the transfer platform, and a plurality of freely rotatable rollers are installed on the upper surface of the intermediate transfer track.

[0020] By adopting the above technical solution, the intermediate transfer track and its rollers provide a low-friction transition path for the transfer of the lower mold between the mold changing trolley and the transfer platform, making the sliding smoother and more stable, and reducing wear.

[0021] Furthermore, the second transfer device also includes a sand-topping mechanism, which is located below the demolding station along the second transfer track and includes a sand-topping cylinder and a sand-topping rod; a sand-topping sleeve corresponding to the sand-topping rod is provided on the transfer platform.

[0022] By adopting the above technical solution, the sand ejection mechanism realizes the automatic ejection of the sand core from the lower mold after curing. The sand ejection sleeve provides precise guidance for the sand ejection rod, and the demolding process is stable and efficient, which facilitates subsequent part removal.

[0023] Furthermore, the core-making device includes a frame, a third transfer device, a sand-shooting mechanism, and an air-blowing mechanism. The third transfer device is fixedly installed on the frame and its moving direction is parallel to the second transfer track. The sand-shooting mechanism and the air-blowing mechanism are fixedly installed on the slide of the third transfer device. The frame is provided with a feed interface connected to an external sand tank and an air tank. The air tank is connected to the air-blowing mechanism through a pipeline.

[0024] Using the above technical solution, the third transfer device realizes the synchronous and precise movement and positioning of the two core process mechanisms of sand shooting and air blowing; it integrates the feeding interface and air tank, which facilitates the centralized supply and connection of materials and gas, and has a compact layout.

[0025] Furthermore, the sand-shooting mechanism includes a second pressing cylinder and a sand-shooting plate. The sand-shooting plate has a hollow interior and is connected to a sand inlet pipe and multiple sand-shooting pipes. The inlet of the sand inlet pipe faces upward and can connect with the feed interface. The cylinder body of the second pressing cylinder is fixed on the slide of the third transfer device, and its piston rod is connected downward to the sand-shooting plate. The air-blowing mechanism includes a first pressing cylinder and an air-blowing plate. The air-blowing plate has an air passage and multiple air-blowing pipes inside. The cylinder body of the first pressing cylinder is fixed on the slide of the third transfer device, and its piston rod is connected downward to the air-blowing plate. The sand-shooting plate has second clamping assemblies on both sides, and the air-blowing plate has third clamping assemblies on both sides. The structures of the second clamping assemblies and the third clamping assemblies are the same as those of the first clamping assemblies.

[0026] Using the above technical solution, the sand-shooting mechanism achieves efficient sand filling through a sand-shooting plate that can be raised and lowered; the air-blowing mechanism achieves uniform air-blowing and solidification through a sealable and pressurized air-blowing plate; the second and third clamping components provide additional lateral clamping force during sand-shooting and air-blowing to ensure the sealing and stability of the mold during the process, prevent sand leakage or air leakage, and ensure the quality of the sand core.

[0027] In summary, the sand core preparation equipment provided by this invention has the following beneficial effects: 1. Through the transfer tracks arranged perpendicularly to each other and the flipping assembly with a flipping frame, the lower mold is automatically received and turned from the supply line to the processing line, replacing the traditional crane hoisting, improving transfer efficiency and positioning accuracy, and eliminating safety hazards.

[0028] 2. The transfer platform integrates clamping and lifting functions. After the lower mold is positioned once, all processes such as mold closing, sand injection, curing, mold opening, and ejection can be completed in sequence, reducing intermediate transfer and waiting time and optimizing production cycle.

[0029] 3. The equipment adopts a modular design. The first and second transfer devices form a T-shaped flow path to save space. The core-making device integrates sand shooting and air blowing mechanisms and shares the third transfer device. The overall automation level is high, which significantly reduces labor costs and floor space, and is suitable for modern large-scale casting production. Attached Figure Description

[0030] Figure 1 It is a three-dimensional view of the equipment, mainly showing its overall structure; Figure 2 The main exhibits are the first transfer device and the second transfer device; Figure 3 The main exhibits include the transfer module and the lifting mechanism; Figure 4 The main exhibits include the second transfer module, the frame, and the core-making device; Figure 5The main focus is on showcasing the specific structure of the chip-making device.

[0031] Explanation of reference numerals in the attached drawings: 11. First transfer track; 111. Mold changing trolley; 112. Intermediate transfer track; 21. Transfer platform; 211. Top sand sleeve; 212. Tilting cylinder; 213. Tilting frame; 22. Lifting rod; 221. Rubber wheel; 23. Lifting cylinder; 24. Drive module; 25. Second transfer track; 26. Top sand cylinder; 27. Top sand rod; 301. First clamping assembly; 31. Gripper; 32. Clamping cylinder; 302. Second clamping assembly; 303. Third clamping assembly; 100. Frame; 101. Third transfer device; 41. Air tank; 42. Feed interface; 43. Air blowing plate; 431. Air blowing pipe; 432. First pressing cylinder; 44. Sand shooting plate; 441. Sand shooting pipe; 442. Sand inlet pipe; 443. Second pressing cylinder. Detailed Implementation

[0032] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0033] In the description of this invention, it should be understood that the terms center, longitudinal, transverse, length, width, thickness, front, back, left, right, upper, lower, axial, radial, vertical, horizontal, inner, and outer, indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms first and second are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as first or second may explicitly or implicitly include one or more of that feature. In the description of this invention, "multiple" means two or more, unless otherwise explicitly specified.

[0034] In this invention, unless otherwise explicitly specified and limited, the terms installation, connection, linking, fixing, etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] The preferred embodiments of the sand core preparation equipment provided in this application will be described in detail below with reference to the accompanying drawings. This equipment aims to solve the automation problems of core box transfer, mold opening and closing, and sand injection and curing processes in the preparation of large sand cores, thereby improving production efficiency and operational safety.

[0036] See appendix Figure 1 This sand core preparation equipment mainly consists of a first transfer device, a second transfer device, and a core-making device. The entire equipment is designed based on modular and assembly line concepts. The first transfer device is responsible for the lateral supply of the lower mold, the second transfer device is responsible for receiving and positioning the lower mold, closing and opening the mold with the upper mold, and ejecting the formed workpiece, and the core-making device is responsible for injecting sand into the mold and solidifying it. The movement direction of the first transfer device (e.g., the X direction) and the movement direction of the second transfer device (e.g., the Y direction) are arranged perpendicularly in space, forming a T-shaped material flow path, saving planar layout space.

[0037] See appendix Figure 1 and 2 The first transfer device is the input end of the lower mold, and its core function is to accurately transport the mold-changing trolley 111, which carries the lower mold, to the handover station with the second transfer device. This device includes a first transfer track 11 and a mold-changing trolley 111. The first transfer track 11 is fixedly installed on the equipment foundation or frame, and is typically two parallel rigid guide rails. The mold-changing trolley 111 is supported on the first transfer track 11 by its bottom wheel set and can reciprocate along the track. The mold-changing trolley 111 can be driven by an integrated motor or by an external push cylinder at the end of the track. The top surface of the mold-changing trolley 111 is a load-bearing structure used to place the lower mold to be used. At the end of the first transfer track 11 near the second transfer device, a material receiving sensor is installed to detect whether the mold-changing trolley 111 has accurately reached the preset handover position and trigger a stop signal.

[0038] See appendix Figure 1 and 2 The second transfer device is a mechanism for receiving, flipping, transferring, closing and opening the mold and demolding the lower mold. The device mainly includes the second transfer track 25, the transfer platform 21, the flipping component, the clamping mechanism, the lifting mechanism and the top sand mechanism.

[0039] See appendix Figure 2-4 The transfer platform 21 is a rigid flat plate structure, and its bottom is connected to the second transfer track 25 via a slider. The second transfer track 25 is fixedly installed, and its extension direction is perpendicular to the first transfer track 11. The drive module 24 is set as a powered cable chain slide, and the drive module 24 is connected to the transfer platform 21 to drive it to move precisely along the second transfer track 25.

[0040] The flipping assembly is used to automatically transfer the lower mold from the mold changing trolley 111 to the transfer platform 21. It is fixedly installed on the edge of the transfer platform 21 near the first transfer device. This assembly includes a flipping drive, specifically a flipping cylinder 212 in this embodiment, and a flipping frame 213. The flipping frame 213 is generally long rod-shaped or frame-shaped, with one end hinged to the side of the transfer platform 21 via a hinge shaft, allowing the flipping frame 213 to rotate around this hinge point. The other end of the flipping frame 213, the free end, extends outward from the transfer platform 21, i.e., toward the first transfer device. Initially, the flipping frame 213 is in a horizontal position, with its extension suspended in the air. When the mold changing trolley 111, carrying the lower mold, reaches the handover position and stops, the drive module 24 drives the transfer platform 21 to approach the mold changing trolley 111. At this point, the extension of the horizontally positioned tilting frame 213 penetrates the bottom space of the mold-changing trolley 111 from below and eventually sits directly below the lower mold. Subsequently, the tilting cylinder 212 actuates, driving the tilting frame 213 to rotate upwards around the hinge point. As the tilting frame 213 is raised, its top surface forms a gradually rising slope. This slope first contacts the bottom surface of the lower mold and gradually lifts it from the bearing surface of the mold-changing trolley 111. Under the influence of gravity along the slope, the lower mold begins to slide along the slope of the tilting frame 213 towards the transfer platform 21. To ensure smooth sliding and reduce wear, an intermediate transfer track 112 is provided along the sliding path of the lower mold, i.e., in the gap between the mold-changing trolley 111 and the transfer platform 21. Multiple freely rotatable rollers are mounted on the upper surface of this intermediate transfer track 112. The lower mold slides on these rollers with low frictional resistance and a smooth transition. The stroke of the tilting cylinder 212 is designed to rotate the tilting frame 213 exactly 90 degrees. At this time, the tilting frame 213 is in a vertical state, and the lower mold has been completely transferred and stably placed at the predetermined position on the top surface of the transfer platform 21.

[0041] To ensure the stability of the mold during subsequent core-making processes, the equipment is equipped with a clamping mechanism. The clamping mechanism includes a first clamping assembly 301 for fixing the lower mold. This assembly includes two sets of gripper 31 units symmetrically arranged on opposite sides of the transfer platform 21. Each set of gripper 31 units includes a clamping cylinder 32 and two opposing grippers 31. The middle of the two grippers 31 is hinged to the side wall of the transfer platform 21 via a pivot shaft, and their upper parts are clamping portions that can extend beyond the top surface of the transfer platform 21. The cylinder body and piston rod end of the clamping cylinder 32 are respectively connected to the lower parts of the two grippers 31, forming a "V"-shaped linkage mechanism. When the cylinder piston rod extends or retracts, it synchronously drives the upper parts of the two grippers 31 to move towards each other (clamping) or away from each other (releasing). The side of the lower mold is pre-machined with grooves or through holes that match the shape of the grippers 31. When the flipping frame 213 delivers the lower mold to the precise position of the transfer platform 21, the clamping cylinder 32 of the first clamping assembly 301 is activated, driving the two sets of grippers 31 to move inward simultaneously, so that their clamping parts are engaged in the corresponding holes and slots on the side of the lower mold, thereby firmly locking the lower mold onto the transfer platform 21.

[0042] To handle the upper mold, the second transfer device is also equipped with a lifting mechanism. This mechanism is installed on the lower or side frame of the transfer platform 21 and mainly includes a lifting cylinder 23 and a lifting rod 22 driven by it. Multiple rubber wheels 221 are provided at the top of the lifting rod 22. The upper mold is usually pre-positioned in a standby position above the transfer platform 21 by an external auxiliary system (such as a hanger) and is flexibly supported by the rubber wheels 221 at the top of the lifting rod 22. When mold closing is required, the lifting cylinder 23 retracts, driving the lifting rod 22 to descend, thereby smoothly placing the upper mold onto the lower mold already fixed on the transfer platform 21, completing the mold closing and forming a complete core box. When mold opening is required, the lifting cylinder 23 extends, driving the lifting rod 22 to rise, the rubber wheels 221 contacting the bottom of the upper mold and smoothly lifting it, separating the upper mold from the lower mold and the formed sand core.

[0043] After the sand core has solidified and the mold has been opened, the sand core workpiece needs to be removed from the lower mold. The sand-ejecting mechanism is used for this purpose. This mechanism is located below a specific station (demolding station) along the second transfer track 25. It includes a sand-ejecting cylinder 26 and a sand-ejecting rod 27. On the platform 21, a sand-ejecting sleeve 211 is provided corresponding to the ejection hole of the lower mold. When the molding process is completed, the transfer platform 21, carrying the lower mold with the workpiece (i.e., the sand core), moves to the demolding station and is positioned. Then, the sand-ejecting cylinder 26 actuates, driving the sand-ejecting rod 27 upwards. The sand-ejecting rod 27 passes sequentially through the opening on the equipment base and the sand-ejecting sleeve 211, finally abutting against and acting on the bottom of the sand core workpiece, smoothly ejecting it from the lower mold cavity for removal by a robot or manually.

[0044] See appendix Figure 1 , 4The core-making device, numbered 5, is responsible for filling the core box with sand and solidifying it, and is the core of high-quality and high-efficiency core making. This device is mounted above the transfer platform 21 via an elevated frame 100. The core-making device mainly includes a sand-shooting mechanism, an air-blowing mechanism, and a third transfer device 101 that drives the synchronous movement of the two.

[0045] The third transfer device 101 employs a high-precision power drag chain slide, which is fixedly mounted on the frame 100, and its movement direction is parallel to the second transfer track 25. The slide has a movable slide base, on which the sand-shooting mechanism and the air-blowing mechanism are fixedly mounted side by side, thereby achieving synchronous reciprocating motion of the two.

[0046] The sand-shooting mechanism is used to inject resin sand into the core box cavity. It includes a second pressing cylinder 443 and a sand-shooting plate 44. The sand-shooting plate 44 has a hollow interior, with a sand inlet pipe 442 and multiple sand-shooting pipes 441 connected to it. The inlet of the sand inlet pipe 442 faces upward. A feed interface 42 connected to an external sand tank is fixedly installed on the frame 100. When the third transfer device 101 drives the sand-shooting mechanism to move, the inlet of the sand inlet pipe 442 can be precisely moved to directly below the feed interface 42 and docked to receive the sand. The cylinder body of the second pressing cylinder 443 is fixed on the slide of the third transfer device 101, and its piston rod is connected downward to the sand-shooting plate 44, which can drive the entire sand-shooting plate 44 to move vertically up and down. During sand shooting, the sand-shooting plate 44 moves down to compact the top of the upper mold, ensuring the seal between the sand-shooting port and the mold.

[0047] The air blowing mechanism is used to blow curing agent gas (such as triethylamine) into the core box after sand injection, so that the sand core hardens quickly. It includes a first pressing cylinder 432 and an air blowing plate 43. The air blowing plate 43 has an internal air passage and multiple air blowing pipes 431. The air blowing plate 43 is connected to an air tank 41 mounted on the frame 100 through pipes. The first pressing cylinder 432 is also fixed on the slide and drives the air blowing plate 43 to rise and fall. During air blowing, the air blowing plate 43 moves down to form a sealed chamber with the top of the upper mold.

[0048] The auxiliary clamping components are designed to ensure the sealing pressure during the sand-shooting and air-blowing processes. A second clamping component 302 and a third clamping component 303 are respectively installed on both sides of the sand-shooting plate 44 and the air-blowing plate 43. Their structure is the same as the first clamping component 301, consisting of opposing grippers 31 driven by a cylinder. When the sand-shooting plate 44 or the air-blowing plate 43 is pressed into place, the corresponding clamping components activate, clamping the upper mold from the side to prevent it from shifting or developing gaps under internal pressure.

[0049] The implementation principle of this application is as follows: Lower mold loading and receiving: The mold changing trolley 111 carries a new lower mold along the first transfer track 11 to the handover position. The transfer platform 21 moves along the second transfer track 25 to the handover position, and the tilting frame 213 on it extends horizontally into the bottom of the trolley. The tilting cylinder 212 is activated, driving the tilting frame 213 to rotate 90 degrees, sliding the lower mold along the inclined surface via the intermediate transfer track 112 onto the transfer platform 21 and positioning it precisely. Subsequently, the first clamping assembly 301 is activated to clamp the lower mold.

[0050] Mold closing: The lifting cylinder 23 descends, lowering the upper mold, which is pre-supported by the lifting rod 22, and accurately closing it with the lower mold that is fixed on the transfer platform 21 to form a sealed core box.

[0051] Sand injection process: The third transfer device 101 drives the sand injection mechanism and the air blowing mechanism to move synchronously. First, the sand injection plate 44 moves to below the feed port 42, and the sand inlet pipe 442 connects to complete the sand storage. At the same time, the air blowing plate 43 moves to directly above the core box. Next, the sand injection plate 44 moves above the core box, and the second pressing cylinder 443 drives it to press down, closely adhering to the upper surface of the core box. Simultaneously, the third clamping assembly 303 clamps the upper mold. The sand injection system starts, injecting resin sand into the core box cavity at high speed, filling the mold.

[0052] Air-blowing curing process: After sand shooting is completed, the third clamping assembly 303 is released, the second pressing cylinder 443 lifts the sand shooting plate 44, and the third transfer device 101 moves it away. Subsequently, the air-blowing plate 43 moves to directly above the core box, the first pressing cylinder 432 drives it to press down and seal, and the second clamping assembly 302 clamps the upper mold. The curing agent gas in the air tank 41 is evenly blown into the core box through the air-blowing plate 43, causing the sand core to quickly solidify and form.

[0053] Mold Opening and Workpiece Ejection: After air blowing is completed, all clamping components are released, and the air blowing plate 43 moves upward and resets. The lifting cylinder 23 actuates, driving the lifting rod 22 to rise and lift the upper mold, completing the mold opening. At this time, the formed workpiece remains in the lower mold. The transfer platform 21 carries the lower mold and continues to move along the second transfer track 25 to the demolding station. The sand ejection cylinder 26 of the sand ejection mechanism actuates, driving the sand ejection rod 27 to rise, passing through the sand ejection sleeve 211 to smoothly eject the solidified sand core workpiece from the lower mold, which is then removed by the part removal robot or manually. Thus, a complete core-making cycle ends. The transfer platform 21 can return to the handover position to begin the next cycle.

[0054] By setting up mutually perpendicular first and second transfer tracks 25 and a dedicated tilting assembly, the large lower mold is automatically and smoothly received and turned from the supply line to the processing line, replacing the inefficient and dangerous overhead crane transport. The transfer platform 21 integrates a multi-functional mechanism (clamping and lifting), allowing the lower mold to sequentially complete all processes—mold closing, sand injection, curing, mold opening, and ejection—after a single positioning, greatly improving process continuity and cycle time. The third transfer device 101 drives the sand injection and air blowing mechanisms to move synchronously, optimizing the process sequence and shortening auxiliary time. The overall equipment layout is compact and highly automated, significantly improving the efficiency, accuracy, and safety of large sand core preparation, reducing labor costs and floor space, and making it suitable for modern large-scale casting production.

[0055] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0056] The detailed descriptions listed above are merely specific illustrations of feasible embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A sand core preparation device, characterized in that, The first transfer device includes a first transfer track (11) and a mold changing trolley (111) that can move along the first transfer track (11); The second transfer device includes a second transfer track (25), a transfer platform (21) movable along the second transfer track (25), and a flipping assembly. The first transfer track (11) is perpendicular to the second transfer track (25). The flipping assembly is disposed on the transfer platform (21). The flipping assembly includes a flipping drive and a flipping frame (213) hinged to the transfer platform (21). The flipping frame (213) has an extension extending toward the first transfer device. The flipping drive is used to drive the flipping frame (213) to rotate so as to transfer the lower mold located on the mold changing trolley (111) to the transfer platform (21). And a core-making device, located above the transfer platform (21).

2. The sand core preparation equipment according to claim 1, characterized in that, The flipping drive is a flipping cylinder (212), which is connected to the flipping frame (213) in a transmission manner.

3. The sand core preparation equipment according to claim 1, characterized in that, The first transfer track (11) is equipped with a material receiving sensor at the end near the second transfer device; the mold changing trolley (111) is equipped with a set of walking wheels at the bottom and is supported on the first transfer track (11) by the set of walking wheels.

4. The sand core preparation equipment according to claim 1, characterized in that, The second transfer device further includes a drive module (24) for driving the transfer platform (21) to move along the second transfer track (25); the bottom of the transfer platform (21) is provided with a slider and is connected to the second transfer track (25) through the slider.

5. The sand core preparation equipment according to claim 1, characterized in that, The second transfer device further includes a first clamping assembly (301) for fixing the lower mold. The first clamping assembly (301) includes two sets of clamping jaw (31) units symmetrically arranged on opposite sides of the transfer platform (21). Each set of clamping jaw (31) units includes a clamping cylinder (32) and two opposing clamping jaws (31). The middle part of the clamping jaw (31) is hinged to the side wall of the transfer platform (21) through a rotating shaft. The upper part of the clamping jaw (31) is a clamping part that can extend out of the top surface of the transfer platform (21). The cylinder body and piston rod end of the clamping cylinder (32) are respectively connected to the lower part of the two clamping jaws (31).

6. The sand core preparation equipment according to claim 1, characterized in that, The second transfer device also includes a lifting mechanism, which is installed on the lower or side frame of the transfer platform (21) and includes a lifting cylinder (23) and a lifting rod (22) driven by the lifting cylinder (23). The top of the lifting rod (22) is provided with a plurality of rubber wheels (221).

7. The sand core preparation equipment according to claim 1, characterized in that, The second transfer device also includes an intermediate transfer track (112) located in the gap between the mold changing trolley (111) and the transfer platform (21), and the upper surface of the intermediate transfer track (112) is equipped with a plurality of freely rotatable rollers.

8. The sand core preparation equipment according to claim 1, characterized in that, The second transfer device also includes a sand-lifting mechanism, which is located below the demolding station along the second transfer track (25) and includes a sand-lifting cylinder (26) and a sand-lifting rod (27); the transfer platform (21) is provided with a sand-lifting sleeve (211) corresponding to the sand-lifting rod (27).

9. The sand core preparation equipment according to claim 1, characterized in that, The core-making apparatus includes: Frame (100); The third transfer device (101) is fixedly installed on the frame (100) and its moving direction is parallel to the second transfer track (25); The sand-shooting mechanism is fixedly installed on the slide of the third transfer device (101); The air blowing mechanism is fixedly installed on the slide of the third transfer device (101); The frame (100) is provided with a feeding interface (42) connected to an external sand tank and an air tank (41), and the air tank (41) is connected to the air blowing mechanism through a pipeline.

10. The sand core preparation equipment according to claim 9, characterized in that, The sand-shooting mechanism includes a second pressing cylinder (443) and a sand-shooting plate (44). The sand-shooting plate (44) has a cavity inside and is connected to a sand inlet pipe (442) and multiple sand-shooting pipes (441). The inlet of the sand inlet pipe (442) faces upward and can be connected to the feed interface (42). The cylinder body of the second pressing cylinder (443) is fixed on the slide of the third transfer device (101), and its piston rod is connected downward to the sand-shooting plate (44). The blowing mechanism includes a first pressing cylinder (432) and a blowing plate (43). The blowing plate (43) has an air passage and multiple blowing pipes (431) inside. The cylinder body of the first pressing cylinder (432) is fixed on the slide of the third transfer device (101), and its piston rod is connected downward to the blowing plate (43). The sand-shooting plate (44) is provided with a second clamping assembly (302) on both sides, and the air-blowing plate (43) is provided with a third clamping assembly (303) on both sides. The structure of the second clamping assembly (302) and the third clamping assembly (303) is the same as that of the first clamping assembly (301).

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