A sand handling system for expendable pattern casting

Abstract

The application relates to the field of casting part processing, in particular to a sand processing system for lost foam casting, which comprises a boiling cooling bed, a plurality of groups of upper air inlets and lower air inlets are arranged on the boiling cooling bed, the upper air inlets and the lower air inlets are used for bidirectional blowing of sand, a plurality of cooling mechanisms are arranged on the boiling cooling bed, the hollow shaft continuously rotates to drive the supporting plate to synchronously rotate, the supporting plate drives the heat-conducting plate on the supporting plate to actively catch the sand blown up by the upper air inlets, thereby forcibly assisting the sand to move along a predetermined track, the upper air inlets and the lower air inlets are arranged in a bidirectional blowing mode, meanwhile, the sand on the perforated plate and the heat-conducting plate is subjected to heat conduction cooling through direct physical contact between the heat-conducting plate and the sand, the comprehensive efficiency of the heat convection cooling and the heat conduction cooling is greatly improved, and the defect that the cooling effect is uncontrollable due to complete dependence on wind force in the traditional boiling cooling bed is effectively overcome.

Description

Technical Field

[0001] This invention relates to the field of casting parts processing, specifically a sand processing system for lost foam casting. Background Technology

[0002] Lost foam casting is a new type of precision casting method that involves bonding and assembling foam models similar in size and shape to the casting into a model cluster, coating them with refractory paint and drying them, burying them in dry sand and vibrating them to shape them, pouring molten metal under negative pressure, causing the model to vaporize and disappear, the molten metal to occupy the model's position, and solidifying and cooling to form the casting.

[0003] The treatment of old sand in lost foam casting is relatively simple. Since dry sand is used, the old sand after the sand is removed is dry and loose, with good fluidity. It does not require the complicated processes of boxing, vibration sand removal, crushing and sand mixing in traditional sand casting. The general process of old sand treatment is: sand removal, screening, dust removal, magnetic separation, cooling, sand filling and vibration molding.

[0004] Cooling is the core step in the treatment of old sand. The temperature of the sand entering the mold can reach 400-500℃ in some areas, while the process requires that the molding sand must be cooled to below 50℃ before it can be recycled. Excessive molding sand temperature will directly lead to softening and deformation of the foam model, defects such as sand sticking and porosity in the casting, and even production interruption in severe cases. Therefore, an efficient and stable old sand cooling system is crucial to ensuring continuous production and casting quality in lost foam casting.

[0005] Currently, fluidized bed cooling is one of the most widely used devices for cooling old sand in lost foam casting. Its typical working method is as follows: hot sand enters the fluidized bed cooling from a vertical cold storage tank. Multiple layers of interlaced water-cooled pipes are arranged in the bed along the sand flow direction. The equipment uses a blower system to blow cold air from the bottom of the bed to make the hot sand fluidized and boil in the bed, increasing the contact opportunity between the sand particles and the water-cooled pipe bundles embedded in the bed. At the same time, the cooling airflow carries the heat upward, and then the hot sand is indirectly cooled by the counter-flowing cooling water.

[0006] However, the above-mentioned traditional fluidized bed cooling has obvious technical defects in practical applications. First, the traditional fluidized bed cooling relies entirely on the high-pressure air force blown in from the bottom of the bed in one direction to blow up the molding sand to form a fluidized state. Due to the inherent differences in the particle size and specific gravity of the sand particles in the molding sand, the effect of the air force on each sand particle is inconsistent, resulting in uneven rising height of the sand particles in the bed and a significant reduction in cooling efficiency.

[0007] Secondly, the heat exchange between molding sand and water-cooled tube bundles depends entirely on the random collisions between sand particles and the outer wall of the water-cooled tube bundles during the suspension process. This heat conduction method, which relies on random collisions, makes the heat exchange highly accidental and uncertain, resulting in low heat conduction efficiency. Consequently, the sand discharge temperature is difficult to control stably below the process requirement of 50°C, which directly affects the smooth progress of subsequent molding processes and the quality of the final casting. Summary of the Invention

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a sand treatment system for lost foam casting, including a fluidized bed cooling bed, a number of upper air inlets and lower air inlets arranged on the fluidized bed cooling bed, the upper air inlets and lower air inlets being used for bidirectional blowing of molding sand, a number of cooling mechanisms arranged on the fluidized bed cooling bed, the cooling mechanisms being used to assist in the lifting of molding sand and to cool the molding sand through heat conduction.

[0009] The upper and lower air inlets are arranged adjacently and alternately, and the molding sand is cooled by heat convection through the cooling airflow. The cooling mechanism is located between two adjacent upper and lower air inlets.

[0010] The cooling mechanism includes a hollow shaft mounted on a boiling cooling bed via a drive assembly. Several circumferentially spaced support plates are sealed and fixedly connected to the hollow shaft. Perforated plates and heat-conducting plates are detachably connected to both sides of the support plates.

[0011] Cooling water is introduced into the hollow shaft, allowing it to flow into the interior of the support plate, thereby cooling the perforated plate and the heat-conducting plate, and then conducting heat transfer cooling on the molding sand on the perforated plate and the heat-conducting plate.

[0012] As a preferred embodiment of the present invention, both the upper and lower air inlets are composed of a permeable plate and an external air supply device, so that the cooling airflow blown out by the external air supply device passes through the permeable plate and is blown into the boiling cooling bed.

[0013] In a preferred embodiment of the present invention, the heat-conducting plate is located on the side where the tray rotates in the same direction, and the perforated plate is located on the side where the tray rotates in the opposite direction.

[0014] As a preferred embodiment of the present invention, two snap-on plates are fixedly installed on the tray, the perforated plate and the heat-conducting plate are snapped onto the snap-on plates, and the tray is detachably connected to the locking buckle for fixing the perforated plate and the heat-conducting plate by screws.

[0015] As a preferred embodiment of the present invention, the hollow shaft and its upper support plate are fixedly connected to a guide member. The guide member allows cooling water flowing in from one end of the hollow shaft to pass through the support plate and then flow out from the other end of the hollow shaft.

[0016] As a preferred embodiment of the present invention, the side of the support plate corresponding to the perforated plate has an inclined structure. When the perforated plate is facing upward, the cooling airflow from the lower air outlet passes through the perforated plate and then through the inclined structure of the support plate, and then flows out through the side of the perforated plate.

[0017] As a preferred embodiment of the present invention, a plurality of equally spaced corrugated plates are fixedly installed on the side of the heat-conducting plate away from the support plate.

[0018] As a preferred embodiment of the present invention, the drive assembly includes two rotating tubes that are rotatably and sealed to the boiling cooling bed, and the two oppositely arranged rotating tubes are slidably and sealed to the corresponding hollow shaft.

[0019] As a preferred embodiment of the present invention, the driving assembly further includes a permanent magnet motor fixedly installed on the boiling cooling bed, and the permanent magnet motor drives the rotating tube through a belt drive structure.

[0020] As a preferred embodiment of the present invention, the drive assembly further includes a movable frame rotatably disposed on the outside of the hollow shaft, the movable frame being slidably connected to the boiling cooling bed, and a hydraulic cylinder for driving the movable frame being fixedly installed on the boiling cooling bed.

[0021] The beneficial effects of this invention are as follows: First, this invention uses a continuously rotating hollow shaft to drive the support plate to rotate synchronously, so that the support plate drives the heat-conducting plate on it to actively catch the molding sand blown by the upper air outlet, thereby forcing the molding sand to rise and move along a predetermined trajectory. Then, by using the bidirectional air blowing with the upper and lower air outlets arranged alternately, orderly and stable heat convection and heat dissipation of the molding sand is achieved. At the same time, through the direct physical contact between the heat-conducting plate and the molding sand, heat conduction cooling is carried out on the molding sand supported by the perforated plate and the heat-conducting plate, which greatly improves the comprehensive efficiency of heat convection cooling and heat conduction cooling, and effectively overcomes the defect of traditional fluidized bed cooling that relies entirely on wind power, resulting in uncontrollable cooling effect.

[0022] Second, the present invention uses a continuously rotating pallet to actively move the molding sand along a set direction in the fluidized bed, so that the molding sand forms a stable and controllable flow path in the bed. This can effectively prevent the molding sand from being disorderly stationary in the fluidized bed for a long time due to uneven airflow, and avoid the problem of insufficient heat dissipation caused by prolonged molding sand retention, thereby ensuring the overall cooling efficiency of the molding sand and the uniformity of the sand outlet temperature.

[0023] Third, the present invention uses equally spaced corrugated plates to significantly increase the effective contact area between the heat-conducting plate and the molding sand. At the same time, the hydraulic cylinder drives the moving frame to move the hollow shaft and its support plate back and forth along the boiling cooling bed, so that the heat-conducting plate vibrates back and forth during rotation, thereby increasing the uniformity of the molding sand on the heat-conducting plate, improving the surface adhesion between the molding sand and the heat-conducting plate and the corrugated plate, and further enhancing the heat conduction and cooling effect of the heat-conducting plate on the molding sand.

[0024] Fourth, when the perforated plate is used to support the molding sand, the cooling airflow blown downward from the downdraft directly acts on the surface of the molding sand on the perforated plate. After passing through the pores of the perforated plate, the cooling airflow is guided by the inclined structure set on one side of the support plate corresponding to the perforated plate, and then flows out through the side of the perforated plate. This allows the downward cooling airflow to exert a certain blowing pressure on the molding sand when passing through the molding sand layer, pressing the molding sand onto the perforated plate. This significantly increases the effective contact time and contact area between the cooling airflow and the molding sand, further improving the thermal convection cooling effect on the molding sand. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the corrugated plate, hollow shaft, perforated plate and permanent magnet motor in this invention; Figure 3 This is a schematic diagram of the structure of the heat-conducting plate, hollow shaft, support plate and moving frame in this invention; Figure 4 This is a schematic diagram of the structure of the perforated plate, the snap-fit ​​plate, the hollow shaft, and the locking buckle in this invention; Figure 5 This is a cross-sectional view of the support plate, hollow shaft, perforated plate and heat-conducting plate in this invention; Figure 6 This is a partial sectional view of the flow guide, hollow shaft, support plate and orifice plate in this invention; Figure 7 This is a schematic diagram of the structure of the boiling cooling bed, the upper air outlet, and the lower air outlet in this invention.

[0027] In the diagram: 1. Boiling cooling bed; 2. Upper air outlet; 3. Lower air outlet; 4. Cooling mechanism; 41. Drive assembly; 42. Hollow shaft; 43. Support plate; 44. Perforated plate; 45. Heat-conducting plate; 411. Rotating tube; 412. Permanent magnet motor; 413. Moving frame; 414. Hydraulic cylinder; 421. Guide component; 431. Buckle plate; 432. Locking buckle; 451. Corrugated plate. Detailed Implementation

[0028] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0029] See Figure 1 , Figure 2 and Figure 7A sand treatment system for lost foam casting includes a fluidized bed cooling bed 1, which is provided with several sets of upper air inlets 2 and lower air inlets 3. The upper air inlets 2 and lower air inlets 3 are used to blow molding sand in both directions. The fluidized bed cooling bed 1 is provided with several cooling mechanisms 4, which are used to assist in the lifting of molding sand and to cool the molding sand through heat conduction.

[0030] When cooling the old molding sand, the molding sand is introduced into the right side of the fluidized bed cooling bed 1 through the external feeding equipment. At the same time, the cooling airflow is blown upward into the fluidized bed cooling bed 1 through the upper air outlet 2 and downward into the fluidized bed cooling bed 1 through the lower air outlet 3. The cooling mechanism 4 is activated to assist in moving the molding sand in the fluidized bed cooling bed 1, so that the cooled molding sand continues to move to the left.

[0031] The upper wind inlet 2 and the lower wind inlet 3 are arranged alternately and adjacently. The bidirectional cooling airflow blown out by the upper wind inlet 2 and the lower wind inlet 3 realizes orderly and stable heat convection and heat dissipation of the molding sand. The cooling mechanism 4 is located between two adjacent upper wind inlets 2 and lower wind inlets 3. While the cooling mechanism 4 assists in moving the molding sand, it also realizes heat conduction cooling of the molding sand through contact with the molding sand. This effectively overcomes the defect of traditional cooling equipment that relies entirely on wind power, resulting in uncontrollable cooling effect.

[0032] See Figure 1 , Figure 2 , Figure 3 and Figure 4 The cooling mechanism 4 includes a hollow shaft 42 mounted on the boiling cooling bed 1 via a drive assembly 41. Several circumferentially spaced support plates 43 are sealed and fixedly connected to the hollow shaft 42. Perforated plates 44 and heat-conducting plates 45 are detachably connected to both sides of the support plates 43.

[0033] When cooling the molding sand, the drive assembly 41 drives the hollow shaft 42 to rotate continuously, so that the hollow shaft 42 drives the perforated plate 44 and the heat-conducting plate 45 to rotate synchronously through the support plate 43. When the support plate 43 drives the perforated plate 44 and the heat-conducting plate 45 to the position of the upper air outlet 2, the heat-conducting plate 45 is located above the perforated plate 44, so that the heat-conducting plate 45 assists in lifting the molding sand upward and makes the lifted molding sand contact the heat-conducting plate 45. Cooling water is introduced into the hollow shaft 42, so that the cooling water flows into the interior of the support plate 43, thereby cooling the perforated plate 44 and the heat-conducting plate 45, and then heat conduction cooling of the molding sand on the perforated plate 44 and the heat-conducting plate 45.

[0034] As the support plate 43 drives the perforated plate 44 and the heat-conducting plate 45 to rotate to the downwind port 3, the perforated plate 44 gradually flips to the top of the heat-conducting plate 45. This causes the molding sand on the heat-conducting plate 45 to slide down onto the perforated plate 44 under the influence of the wind force at the downwind port 3 and its own gravity. This causes the downward cooling airflow to exert a certain blowing pressure on the molding sand, pressing the molding sand onto the perforated plate 44. This significantly increases the effective contact time and contact area between the cooling airflow and the molding sand, further improving the cooling effect of heat convection and heat conduction on the molding sand.

[0035] Simultaneously, the rotation of the support plate 43 causes the perforated plate 44 and the heat-conducting plate 45 to continuously drive the molding sand to move to the left, so that the molding sand can continuously move along the inside of the fluidized bed 1 during the cooling process, and finally the molding sand is fed to the left side of the fluidized bed 1.

[0036] To achieve bidirectional airflow cooling of the molding sand through the upper air inlet 2 and the lower air inlet 3, the present invention designs the following structure: (See reference) Figure 1 and Figure 7 Both the upper air inlet 2 and the lower air inlet 3 are composed of a permeable plate and an external air supply device. The external air supply device of the upper air inlet 2 blows air upward, and the external air supply device of the lower air inlet 3 blows air downward, so that the cooling airflow blown out by the external air supply device passes through the permeable plate and is blown into the boiling cooling bed 1.

[0037] To achieve stable conveying of molding sand by the rotating pallet 43, the present invention designs the following structure: (See attached diagram) Figure 1 , Figure 2 , Figure 3 and Figure 4 The heat-conducting plate 45 is located on the side of the support plate 43 rotating in the same direction, and the perforated plate 44 is located on the side of the support plate 43 rotating in the opposite direction. When the support plate 43 moves upward, the heat-conducting plate 45 on the support plate 43 supports the molding sand, and at the same time, the molding sand is cooled by heat conduction. When the support plate 43 rotates to the left, the molding sand slides onto the perforated plate 44, thereby achieving auxiliary movement of the molding sand.

[0038] To facilitate quick replacement of the perforated plate 44 and the heat-conducting plate 45, the present invention designs the following structure: (See attached diagram) Figure 3 and Figure 4 Two clip plates 431 are fixedly installed on the support plate 43. The perforated plate 44 and the heat-conducting plate 45 are fastened to the clip plates 431. The support plate 43 is detachably connected to the locking buckle 432 that fixes the perforated plate 44 and the heat-conducting plate 45 by screws.

[0039] When the perforated plate 44 and the heat-conducting plate 45 are severely worn and fail, remove the screws on the locking buckle 432, then remove the locking buckle 432, and then remove the perforated plate 44 and the heat-conducting plate 45. Then, insert the new perforated plate 44 and the heat-conducting plate 45 into the clip plate 431 of the support plate 43, and then use the locking buckle 432 to lock the new perforated plate 44 and the heat-conducting plate 45 onto the support plate 43.

[0040] To achieve cooling of the perforated plate 44 and the heat-conducting plate 45, the present invention designs the following structure: (See attached diagram) Figure 3 , Figure 4 , Figure 5 and Figure 6 The hollow shaft 42 and its upper support plate 43 are both fixedly connected to a guide member 421. The guide member 421 allows the cooling water flowing in from one end of the hollow shaft 42 to pass through the support plate 43 and then flow out from the other end of the hollow shaft 42.

[0041] When cooling the molding sand, cooling water flows in from the front end of the hollow shaft 42, and is diverted by the guide 421 so that the cooling water flows into the support plate 43. Then the cooling water flows out through the support plate 43 into the hollow shaft 42. After that, the cooling water flows out through the rear end of the hollow shaft 42. Then the cooled cooling water flows in again through the front end of the hollow shaft 42, thus circulating and cooling.

[0042] To achieve the desired cooling airflow effect on the molding sand from the downward-blowing airflow at the downwind outlet 3, the present invention designs the following structure: (See attached diagram) Figure 5 and Figure 6 The support plate 43 has an inclined structure on one side corresponding to the perforated plate 44. When the perforated plate 44 is facing upward, the molding sand sliding on it is supported by the perforated plate 44. The cooling airflow of the lower air outlet 3 passes through the perforated plate 44 and then through the inclined structure of the support plate 43, and then flows out through the side of the perforated plate 44.

[0043] The cooling airflow blown downwards from the downdraft 3 directly acts on the molding sand surface on the perforated plate 44. After passing through the pores of the perforated plate 44, the cooling airflow is guided by the inclined structure set on one side of the perforated plate 44 by the support plate 43, and then flows out through the side of the perforated plate 44. This causes the downward cooling airflow to exert a certain blowing pressure on the molding sand when passing through the molding sand layer, pressing the molding sand onto the perforated plate 44. This significantly increases the effective contact time and contact area between the cooling airflow and the molding sand, further improving the thermal convection cooling effect on the molding sand.

[0044] To increase the contact area between the heat-conducting plate 45 and the molding sand, and thus improve the heat conduction and cooling effect on the molding sand, the present invention designs the following structure: (See attached diagram) Figure 3 , Figure 4 and Figure 5 A number of equally spaced corrugated plates 451 are fixedly installed on the side of the heat-conducting plate 45 away from the support plate 43. The cooling water cools the heat-conducting plate 45 and the corrugated plates 451 at the same time. The corrugated plates 451 increase the contact area between the heat-conducting plate 45 and the molding sand, thereby improving the heat conduction and cooling effect of the molding sand.

[0045] To achieve rotation of the hollow shaft 42 and the support plate 43, the present invention designs the following structure: (See attached diagram) Figure 2 , Figure 3 and Figure 4 The drive assembly 41 includes two rotating tubes 411 that are sealed and rotatably connected to the boiling cooling bed 1. The two oppositely arranged rotating tubes 411 are sealed and slidably connected to the corresponding hollow shaft 42.

[0046] See Figure 1 , Figure 2 and Figure 3 The drive assembly 41 also includes a permanent magnet motor 412 fixedly installed on the boiling cooling bed 1, which drives the rotating tube 411 through a belt drive structure.

[0047] In this embodiment, the belt drive structure includes a drive pulley fixedly mounted on the output shaft of the permanent magnet motor 412 and a driven pulley fixedly mounted on the front rotating tube 411. The drive pulley and the driven pulley are wrapped with a belt on their outer sides. The permanent magnet motor 412 rotates the rotating tube 411, causing the rotating tube 411 to drive the hollow shaft 42 to rotate.

[0048] To achieve the back-and-forth vibration of the perforated plate 44 and the heat-conducting plate 45, the present invention designs the following structure: (See reference) Figure 1 , Figure 2 and Figure 3 The drive assembly 41 also includes a movable frame 413 rotatably disposed on the outside of the hollow shaft 42. The movable frame 413 is slidably connected to the boiling cooling bed 1. A hydraulic cylinder 414 for driving the movable frame 413 is fixedly installed on the boiling cooling bed 1.

[0049] The hydraulic cylinder 414 reciprocates by extending and retracting its extension section, causing the hydraulic cylinder 414 to drive the moving frame 413 to move the hollow shaft 42 and its support plate 43 back and forth along the boiling cooling bed 1. This causes the heat-conducting plate 45 to vibrate back and forth during rotation, thereby increasing the uniformity of the molding sand on the heat-conducting plate 45, improving the surface adhesion between the molding sand and the heat-conducting plate 45 and the corrugated plate 451, and further enhancing the heat conduction and cooling effect of the heat-conducting plate 45 on the molding sand.

[0050] In summary, this invention does not aim to completely cool the molding sand to its final operating temperature. Instead, it uses bidirectional cooling airflow from the upper air vent 2 and the lower air vent 3 to provide orderly and stable heat convection cooling of the molding sand. This, combined with the continuously rotating hollow shaft 42 driving the heat-conducting plate 45 and perforated plate 44 on the support plate 43 to actively support and move the molding sand, allows it to continuously move to the left along a set path within the fluidized bed cooling 1 and undergo multiple heat exchange processes. Simultaneously, the circulating cooling water inside the hollow shaft 42 continuously cools the support plate 43, perforated plate 44, heat-conducting plate 45, and corrugated plate 451. The hydraulic cylinder 414 drives the moving frame 413 to vibrate the hollow shaft 42 back and forth to enhance the uniformity of the molding sand. Under the combined effect of heat convection and heat conduction, the temperature of the molding sand is significantly reduced to a range close to the process requirements. This significantly improves the stability and uniformity of the molding sand cooling during the entire cooling process, effectively avoiding the problem of excessive temperature fluctuations in the molding sand caused by local overheating or uneven cooling. It provides uniform, stable and controllable circulating molding sand for the subsequent sand filling and vibration molding process, which strongly guarantees the continuous production stability and casting quality consistency of lost foam casting.

[0051] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0052] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0053] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A sand treatment system for lost foam casting, comprising a fluidized bed cooling system, characterized in that, The fluidized bed is equipped with several sets of upper and lower air inlets, which are used to blow molding sand in both directions. The fluidized bed is also equipped with several cooling mechanisms, which are used to assist in the lifting of molding sand and to cool the molding sand through heat conduction. The upper and lower air inlets are arranged adjacently and alternately, and the molding sand is cooled by heat convection through cooling airflow. The cooling mechanism is located between two adjacent upper and lower air inlets. The cooling mechanism includes a hollow shaft mounted on a boiling cooling bed via a drive assembly. Several circumferentially spaced support plates are sealed and fixedly connected to the hollow shaft. Perforated plates and heat-conducting plates are detachably connected to both sides of the support plates. Cooling water is introduced into the hollow shaft, allowing it to flow into the interior of the support plate, thereby cooling the perforated plate and the heat-conducting plate, and then conducting heat transfer cooling on the molding sand on the perforated plate and the heat-conducting plate.

2. The sand treatment system for lost foam casting according to claim 1, characterized in that, Both the upper and lower air inlets are composed of a permeable plate and an external air supply device, allowing the cooling airflow blown out by the external air supply device to pass through the permeable plate and enter the boiling cooling bed.

3. The sand treatment system for lost foam casting according to claim 1, characterized in that, The heat-conducting plate is located on the side where the tray rotates in the same direction, and the perforated plate is located on the side where the tray rotates in the opposite direction.

4. The sand treatment system for lost foam casting according to claim 1, characterized in that, Two clip plates are fixedly installed on the tray. The perforated plate and the heat-conducting plate are fastened to the clip plates. The tray is detachably connected to the locking buckle for fixing the perforated plate and the heat-conducting plate by screws.

5. The sand treatment system for lost foam casting according to claim 1, characterized in that, The hollow shaft and its upper support plate are fixedly connected to a guide member. The guide member allows the cooling water flowing in from one end of the hollow shaft to pass through the support plate and then flow out from the other end of the hollow shaft.

6. The sand treatment system for lost foam casting according to claim 1, characterized in that, The support plate has an inclined structure on one side corresponding to the perforated plate. When the perforated plate is facing upward, the cooling airflow from the lower air outlet passes through the perforated plate and then through the inclined structure of the support plate, and then flows out through the side of the perforated plate.

7. The sand treatment system for lost foam casting according to claim 1, characterized in that, Several equally spaced corrugated plates are fixedly installed on the side of the heat-conducting plate away from the support plate.

8. The sand treatment system for lost foam casting according to claim 1, characterized in that, The drive assembly includes two rotating tubes that are rotatably and sealed to the boiling cooling bed, and the two oppositely arranged rotating tubes are slidably and sealed to the corresponding hollow shaft.

9. A sand treatment system for lost foam casting according to claim 8, characterized in that, The drive assembly also includes a permanent magnet motor fixedly mounted on the boiling cooling bed, which drives the rotating tube through a belt drive structure.

10. A sand treatment system for lost foam casting according to claim 1, characterized in that, The drive assembly also includes a movable frame that is rotatably disposed on the outside of the hollow shaft. The movable frame is slidably connected to the boiling cooling bed, and a hydraulic cylinder that drives the movable frame is fixedly installed on the boiling cooling bed.

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