A resin sand casting bottom box

Abstract

The application discloses a resin sand casting bottom box and relates to the technical field of casting equipment. The resin sand casting bottom box comprises a square frame and a bottom plate module. The bottom plate module is composed of a bottom plate frame and a movable bottom plate. Equidistant supporting tables are arranged on the inner wall of the square frame. The supporting tables are provided with first air holes penetrating through the side wall of the square frame. Temperature control adjusting components are arranged in the inner wall of the square frame. The temperature control adjusting components control the opening and closing of the first air holes through temperature change. A sand reducing and heat dissipating layer is arranged on the movable bottom plate. The sand reducing and heat dissipating layer improves the forming efficiency by expanding the airflow channel. A vibrating and compacting assembly is arranged outside the square frame. The vibrating and compacting assembly reduces the gap between the sand by knocking and vibrating. The resin sand casting bottom box realizes layered sand reduction through the supporting tables, realizes automatic exhaust during the casting stage through the temperature control adjusting components, realizes forced cooling through the cooling pipes, realizes manual auxiliary vibration and compaction during the sand filling stage through the vibrating and compacting assembly, and further reduces the sand consumption and improves the heat dissipation efficiency through the sand reducing and heat dissipating layer.

Description

Technical Field

[0001] This invention relates to the field of casting equipment technology, specifically to a bottom box for resin sand casting. Background Technology

[0002] Resin sand casting technology has been widely used in the production of large castings due to its advantages such as smooth casting surface, high dimensional accuracy, and clear edges. In the resin sand molding process, the bottom box, as the basic tooling that supports the sand mold and casting, directly affects the molding efficiency, casting quality, and production cost. At present, the traditional bottom box for resin sand casting mainly adopts an integral box structure, that is, the sand box frame is welded to the bottom of the annular sand box frame and resin sand is filled on it to form a flat sand bottom. However, in actual use, this type of bottom box has high production costs due to the large amount of resin sand used, slow cooling speed of the casting after pouring, and long production cycle.

[0003] To address the aforementioned deficiencies, existing technology (Chinese Patent Publication No. CN115555522A, Publication Date 2023-01-03) discloses a casting bottom box and its usage method. This bottom box has good rigidity and can reduce the amount of sand used in the bottom box by nearly half. If used in conjunction with a ring box of appropriate height, the overall amount of sand used can be reduced even further. Simultaneously, since half of the bottom box is open to the outside, the heat dissipation capacity of the molding sand after pouring is improved, accelerating the cooling rate of the casting and increasing the tensile strength of the bottom body of the casting. Existing technology (Chinese Patent No. CN217798842U, published on 2022-11-15) discloses a coated sand casting device for metal valves. This device places a lower diaphragm shell inside the casting base and fills the lower coated sand trough with coated sand; it then places an upper diaphragm shell inside the casting top box and fills the upper coated sand trough with coated sand. After filling, the casting top box is installed on the casting base, with multiple positioning blocks corresponding to multiple positioning slots to effectively prevent misalignment after installation. Rotating the handle drives a threaded adjusting rod, which moves downwards through the threaded hole, causing the pressure plate to move downwards and press against the top mounting block, ensuring a tight connection between the casting base and the casting top box. This design minimizes the leakage of casting liquid after casting, avoiding casting failures or complicated post-casting procedures.

[0004] In the process of using the above solutions, one is completely open and the other is a sealed box. The cooling mechanisms of both are simple and fixed, relying only on natural heat dissipation from the opening area of ​​the bottom plate or openings in the top of the closed box. Both treat the bottom box as a passive load-bearing structure, and the cooling and exhaust are static and passive. Furthermore, during the sand filling period, only pressing is used, resulting in low filling efficiency and large gaps. Summary of the Invention

[0005] The purpose of this invention is to provide a bottom box for resin sand casting, which solves the problems mentioned in the background art of existing bottom boxes for resin sand casting. In use, these bottom boxes rely solely on natural heat dissipation from the perforated area of ​​the bottom plate or on the top of the enclosed box. Both methods treat the bottom box as a passive load-bearing structure, and the cooling and venting are static and passive. Furthermore, they do not rely solely on pressing during sand filling, resulting in low filling efficiency and large gaps.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a base box for resin sand casting, comprising a square frame and a base plate module, wherein the base plate module consists of a square base plate frame and an inner hinged movable base plate, the inner wall of the square frame is provided with support platforms at equal intervals, and the support platforms are provided with a first vent hole penetrating the side wall of the square frame, and cooling pipes are laid in the inner wall of the square frame, with the input end and output end of the cooling pipes alternately distributed at the top and bottom of the side of the square frame; A temperature control adjustment component is provided in the inner wall of the square frame. The temperature control adjustment component controls the opening and closing of the first vent through temperature changes. A sand-reducing and heat-dissipating layer is laid on the movable base plate. The sand-reducing and heat-dissipating layer improves the molding efficiency by expanding the airflow channel. A vibration compaction component is provided on the outside of the square frame. The vibration compaction component reduces the gaps between sand particles by tapping and vibrating.

[0007] Furthermore, the top of the frame is provided with hanging ears for easy hoisting, and the bottom of the frame of the base plate is provided with feet. When the movable base plate is closed, it forms a bearing plane with the frame, and the bottom of the movable base plate is fixed by a connector and a locking device. The connector is a fan-shaped structure, which forms a circle when closed. The connector has a through hole, and the locking device is a pin. The pin passes through the through hole to fix the opposite movable base plate.

[0008] Furthermore, the temperature control adjustment component includes a closed cavity opened in the inner wall of the square frame, and a heat absorption plate is installed at the bottom of the closed cavity. A memory metal is installed on the top of the heat absorption plate, and a sealing plate is fixed on the top of the memory metal. The sealing plate is slidably connected to the middle of the first vent.

[0009] Furthermore, the sealing plate is designed to be elongated and covers the area of ​​the first vent hole. During casting, the heat-absorbing plate absorbs heat, and the shape memory metal deforms, causing the sealing plate to move downward, thus creating space for the first vent hole to circulate. During sand filling, there is no heat source, and the shape memory metal recovers, causing the sealing plate to move upward and block the first vent hole, preventing resin sand leakage.

[0010] Furthermore, the support platform realizes the layered shape inside the bottom box. Support platforms of different heights are used to adapt to castings of different sizes and shapes. The support platform is provided with anti-slip texture. The first vent hole establishes the exhaust passage of the square frame during casting.

[0011] Furthermore, the sand-reducing heat dissipation layer includes a box rib fixed to the top of the movable base plate. The box rib has a through cavity inside, and the outlet of the through cavity is correspondingly fitted to the second vent hole. The second vent hole is opened around the bottom of the frame. The second vent hole expands the air fluid space at the bottom during casting.

[0012] Furthermore, the reinforcing bars are configured as a crisscrossing mesh structure, and the reinforcing bars can reduce the amount of sand absorbed by the bottom box.

[0013] Furthermore, positioning blocks are installed on the top of the four sides of the frame, and the positioning blocks are connected to the positioning grooves with an interference fit. The positioning grooves are correspondingly opened on the top four sides of the bottom plate frame. The bottom plate frame is set as a hollow structure, and a third ventilation hole for heat dissipation is opened through the four sides of the bottom plate frame.

[0014] Furthermore, the vibration compaction assembly includes a striking plate hinged to the outer perimeter of the frame, and a torsion spring and a cable are installed at the hinge of the striking plate. The top of the cable is fixedly connected to the bottom of the collar. The collar is slidably mounted on the top outer side of the frame and can slide vertically by manual pushing.

[0015] Furthermore, the striking plate generates a striking vibration on the frame through a torsion spring, a cable, and a collar, and a limiting block is installed on the inner wall around the collar. The limiting block is slidably connected to the limiting groove opened around the outer perimeter of the frame. The sliding range of the collar and the installation of the striking plate both avoid the space where the first vent is located, and the striking plate is set as an "L" shaped structure.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This resin sand casting base box uses a square frame and movable base plate as its supporting foundation during use. It achieves layered sand reduction through a support platform, automatic venting during the casting stage through a temperature control adjustment component, forced cooling through a cooling pipe, manual assisted compaction during the sand filling stage through a vibration component, and further reduces sand intake and improves heat dissipation efficiency through a sand reduction and heat dissipation layer.

[0017] 1. Furthermore, the present invention provides a temperature control adjustment component in the inner wall of the frame. This component uses the temperature change naturally generated during the resin sand casting process as a driving signal: during the sand filling stage, the bottom box is at room temperature, the shape memory metal maintains its initial shape, and the sealing plate completely blocks the first vent hole, effectively preventing resin sand particles from leaking; during the pouring stage, the high temperature of the molten metal causes the temperature of the frame side wall to rise, the heat absorption plate transfers heat to the shape memory metal, the shape memory metal undergoes phase deformation and drives the sealing plate to slide, making room for the flow of the first vent hole, establishing a smooth exhaust passage, and the gas generated by the heated resin sand can be discharged in time, avoiding porosity defects in the casting. After cooling, the temperature drops, and the sealing plate automatically resets and closes. This structure does not require an external control signal or power source, and is purely mechanically adaptively controlled, combining the anti-sand leakage function during the sand filling stage with the efficient exhaust function during the pouring stage.

[0018] 2. Furthermore, this invention constructs a three-dimensional heat dissipation system. The upper part opens the first vent through a sealing plate controlled by shape memory metal to expel hot gas from inside the cavity. The middle part uses serpentine cooling pipes laid in the inner wall of the frame, through which compressed air or cooling water can be introduced after casting to achieve forced convection cooling of the bottom box side wall. The lower part uses the box ribs at the top of the movable bottom plate and its internal through cavity, together with the second vent around the bottom of the frame, to form a natural convection heat dissipation channel at the bottom. At the same time, the third vent through the outer edge of the bottom plate further expands the heat dissipation area. The three-layer heat dissipation path echoes each other from top to bottom and combines inside and outside, achieving a composite cooling effect, significantly improving the cooling speed of the casting and greatly shortening the production cycle.

[0019] 3. Furthermore, the present invention has a striking plate hinged around the outer perimeter of the frame. The striking plate is linked to the collar via a torsion spring and a cable. During the sand filling process, the operator only needs to manually push and pull the collar to slide vertically along the limiting groove, which drives the striking plate to generate intermittent striking impacts on the side wall of the frame. This impact vibration is transmitted to the resin sand layer inside through the side wall of the frame, causing the resin sand particles to rearrange, flow and become denser under the vibration, effectively reducing the gaps between particles. The entire compaction process does not require electricity or air source drive, but is achieved by pure mechanical transmission. This avoids the safety hazards of electrical equipment in the high temperature and dusty environment of the foundry workshop, and ensures the simplicity and reliability of the compaction operation. The uniformity of sand mold compaction is significantly better than the traditional manual pressing method.

[0020] 4. Furthermore, the layered structure of the support platform, combined with the mesh support of the box ribs, significantly reduces the thickness of the bottom resin sand filling and the amount of sand consumed. The vibration compaction component does not require electric drive, and the temperature control and exhaust component does not require external control. The purely mechanical structure achieves automatic control with zero power consumption. The tapping and vibration compaction replaces manual pressing, improving sand filling efficiency. The three-dimensional heat dissipation shortens the cooling waiting time, achieving reductions in material, energy consumption, and time costs. It integrates multiple functions such as sand reduction, vibration compaction, adaptive exhaust, and efficient cooling. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall front view of the present invention; Figure 2 This is a schematic diagram of the overall bottom view of the present invention; Figure 3 This is a schematic diagram of the structure of the present invention, showing the separation of the frame, the base plate edge, and the movable base plate from below. Figure 4 This is a top view of the movable base plate, box reinforcement, and positioning block of the present invention. Figure 5 This is a schematic diagram of the cross-sectional structure of the frame and the base plate of the present invention; Figure 6 This is a half-sectional schematic diagram of the reinforcing bars, through cavity, and second vent of the present invention. Figure 7 This is a schematic diagram of the structure of the striking plate, cable, torsion spring, and collar in the separated state from the frame of the present invention; Figure 8 This is a schematic cross-sectional view of the internal structure of the enclosed cavity of the present invention; Figure 9 This is a schematic diagram of the overall distribution structure of the cooling pipe, heat absorption plate, shape memory metal, and sealing plate of the present invention. Figure 10 This is a schematic cross-sectional view of the overall structure of the box reinforcement of the present invention; Figure 11 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 12 For the present invention Figure 3 Enlarged structural diagram at point B; Figure 13 For the present invention Figure 6 Enlarged structural diagram at point C; Figure 14 This is an enlarged structural diagram of point D in the present invention; Figure 15 For the present invention Figure 8 Enlarged structural diagram at point E; Figure 16 For the present invention Figure 10 Enlarged structural diagram at point F.

[0022] In the diagram: 1. Frame; 2. Base plate frame; 3. Movable base plate; 4. Connector; 5. Positioning block; 6. Positioning groove; 7. Support platform; 8. First vent; 9. Cooling pipe; 10. Enclosed cavity; 11. Heat absorber plate; 12. Shape memory metal; 13. Sealing plate; 14. Box reinforcement; 15. Through cavity; 16. Second vent; 17. Striking plate; 18. Torsion spring; 19. Cable; 20. Collar; 21. Limiting block; 22. Limiting groove; 23. Third vent. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Example 1: Please refer to Figure 1 - Figure 16 This invention provides a base box for resin sand casting, including a square frame 1 and a base plate module. The base plate module consists of a square base plate frame 2 and a movable base plate 3 hinged to the inner side. Support platforms 7 are evenly spaced on the inner wall of the square frame 1, and the support platforms 7 are provided with a first vent hole 8 that penetrates the side wall of the square frame 1. Cooling pipes 9 are laid in the inner wall of the square frame 1, and the input and output ends of the cooling pipes 9 are alternately distributed at the top and bottom of the side of the square frame 1. Temperature control adjustment components are provided in the inner walls around the square frame 1, and the temperature control adjustment components control the opening and closing of the first vent hole 8 through temperature changes. A sand-reducing heat dissipation layer is laid on the movable base plate 3, which improves the molding efficiency by expanding the airflow channel. A vibration compaction component is provided on the outside of the square frame 1, which reduces the gap between sand particles by tapping and vibrating.

[0025] The overall work of this solution is as follows: The base box for resin sand casting consists of a square frame 1 and a movable base plate 3 forming the main load-bearing frame. The layered structure of the support platform 7 achieves resin sand reduction. The sealing plate 13 driven by the shape memory metal 12 achieves automatic sequential opening and closing of the first vent 8. The cooling pipe 9 achieves forced cooling. The striking plate 17 driven by the collar 20 achieves manual vibration compaction. The box ribs 14 and their through cavity 15 achieve bottom sand reduction and auxiliary heat dissipation. The various functional modules are closely integrated and arranged around the base box body, without interfering with each other and working together to solve the technical problems of single function, low vibration efficiency, and passive fixed exhaust and heat dissipation in the existing technology. This realizes the multi-functional integration and intelligent control of the resin sand casting base box.

[0026] Specifically, the top four sides of the frame 1 are provided with hanging ears for easy hoisting, and the bottom four sides of the base plate frame 2 are provided with support feet. When the movable base plate 3 is closed, it forms a bearing plane with the frame 1. The bottom of the movable base plate 3 is fixed by the connector 4 and the locking piece. The connector 4 is set as a fan-shaped structure. When the connector 4 is closed, it forms a circle. The connector 4 is provided with a through hole. The locking piece is a pin. The pin passes through the through hole to fix the opposite movable base plate 3. The top four sides of the frame 1 are equipped with positioning blocks 5, and the positioning blocks 5 are connected with the positioning grooves 6 by interference fit. The positioning grooves 6 are opened on the top four sides of the base plate frame 2. The base plate frame 2 is set as a hollow structure, and the outer four sides of the base plate frame 2 are provided with a third ventilation hole 23 for heat dissipation.

[0027] refer to Figure 1 - Figure 6 and Figures 11-13 As shown, the base plate frame 2 is designed as a hollow structure, which reduces the overall weight while providing a certain degree of heat insulation. A third vent 23 is provided around its perimeter for heat dissipation, further expanding the heat dissipation channel. The movable base plate 3 is hinged to the inner side of the base plate frame 2. When closed, it forms a complete load-bearing plane with the square frame 1, supporting the resin sand layer and castings. During sand filling, the connector 4 closes to form a complete ring. Each connector 4 has a through hole, and the locking mechanism uses a pin. The pin passes through the through hole of the opposite connector 4, locking the opposite movable base plate 3 in a closed state. To open, the pin is pulled out, and the movable base plate 3 can be flipped downwards to facilitate demolding or accelerate bottom heat dissipation. The hanging ears and support legs facilitate stable placement and lifting of the base box. The positioning block 5 and the positioning groove 6 are connected by an interference fit to ensure accurate positioning during box closing and prevent misalignment. Further explanation is needed regarding the square frame 1... Cooling pipes 9 are laid in the inner wall of the box. The cooling pipes 9 are serpentine coils and are buried in the side wall below the support platform 7 to avoid interference with the first vent 8. The input and output ends of the cooling pipes 9 are staggered at the top and bottom of the side of the box 1, with the input end at the top of one side and the output end at the bottom of the opposite side, to maximize the flow of the cooling medium in the pipes and improve heat exchange efficiency. After the casting is completed, the operator can introduce compressed air or cooling water from the input end of the cooling pipes 9. The cooling medium flows through the serpentine coils buried in the side wall of the box 1, exchanges heat with the side wall, absorbs the heat accumulated in the box 1, and is discharged from the output end, thus achieving forced cooling of the side wall of the bottom box. The cooling pipes 9 and the first vent 8 are spatially independent: the first vent 8 is distributed in the side wall area above the support platform 7 for exhaust; the cooling pipes 9 are buried in the side wall area below the support platform 7 for cooling. The two are arranged in separate areas, do not interfere with each other, and work together.

[0028] Specifically, the temperature control and adjustment component includes a closed cavity 10 formed in the inner wall of the square frame 1, with a heat-absorbing plate 11 installed at the bottom of the closed cavity 10, a shape memory metal 12 installed at the top of the heat-absorbing plate 11, and a sealing plate 13 fixed at the top of the shape memory metal 12. The sealing plate 13 is slidably connected to the middle of the first vent hole 8. The sealing plate 13 is elongated and covers the area of ​​the first vent hole 8. During casting, the heat-absorbing plate 11 absorbs heat, and the shape memory metal 12 deforms, causing the sealing plate 13 to move downward, making room for the flow of the first vent hole 8. During sand filling, there is no heat source, and the shape memory metal 12 recovers, causing the sealing plate 13 to move upward and block the first vent hole 8, preventing resin sand leakage.

[0029] refer to Figure 5 , Figure 8 - Figure 9 and Figure 15As shown, the temperature control and adjustment component is the core mechanism for achieving automatic exhaust in this invention. Its working principle is based on the thermal deformation characteristics of shape memory metal 12, and its specific working process is as follows: Sand filling stage: The bottom box is at room temperature with no heat source input. The shape memory metal 12 maintains its initial form, i.e., the low temperature phase. The sealing plate 13 is located in the middle of the first vent 8 and completely blocks the vent. At this time, the first vent 8 is in a closed state, which effectively prevents the resin sand particles from leaking from the first vent 8 to the outside of the frame 1 during the sand filling process. During the casting stage: After the high-temperature molten metal is injected into the mold cavity, the heat is conducted through the side wall of the frame 1 to the heat-absorbing plate 11 in the closed cavity 10. The heat-absorbing plate 11 is made of a material with high thermal conductivity, which quickly absorbs heat and transfers the temperature to the shape memory metal 12. When the temperature reaches the phase change temperature point of the shape memory metal 12, the shape memory metal 12 undergoes a phase change and shrinks, which drives the sealing plate 13 to slide downward, making room for the first vent hole 8. This allows the first vent hole 8 to switch from a closed state to an open state. After the first vent hole 8 is opened, the gas generated by the resin sand under heat can be discharged outside the frame 1 along the first vent hole 8, avoiding excessive air pressure in the mold cavity that could cause porosity defects in the casting. Multiple first vent holes 8 are distributed circumferentially along the upper part of the support platform 7 in the side wall of the frame 1, forming a uniform exhaust network.

[0030] Cooling stage: After the casting is completed and the casting gradually cools down, the temperature of the side wall of the frame 1 drops below the phase transformation temperature of the shape memory metal 12. The shape memory metal 12 returns to its initial form, causing the sealing plate 13 to slide in the opposite direction and re-seal the first vent hole 8. Thus, the temperature control adjustment component uses the temperature change that is naturally generated during the resin sand casting process as the driving signal to realize the timing control of the first vent hole 8 to automatically close during the sand filling stage, automatically open during the casting stage, and automatically close after cooling, without the need for external control signals or power sources.

[0031] Specifically, the support platform 7 realizes the layered shape inside the bottom box. The support platforms 7 of different heights are used to adapt to castings of different sizes and shapes. The support platform 7 is provided with anti-slip texture. The first vent hole 8 establishes the exhaust passage of the square frame 1 during casting.

[0032] refer to Figure 1 , Figure 3 - Figure 8 and Figures 11-15As shown, during actual molding, the operator can select a support platform 7 of appropriate height as the bearing surface of the resin sand layer according to the size and weight of the casting. The resin sand only needs to be filled to the height of the selected support platform 7, without filling the entire internal space of the frame 1. The support platform 7 replaces the thick sand layer at the bottom of the box in the traditional process, raising the bearing position of the sand layer from the bottom to the middle of the side wall, effectively reducing the overall filling thickness of the bottom resin sand. At the same time, the anti-slip texture on the support platform 7 can prevent the resin sand layer from sliding along the platform during molding, ensuring the positional stability of the sand mold. Support platforms 7 of different heights can be adapted to castings of different sizes and shapes, and the height of the bottom cavity can be flexibly adjusted.

[0033] Specifically, the sand-reducing heat dissipation layer includes a box rib 14 fixed to the top of the movable base plate 3. The box rib 14 has a through cavity 15 inside, and the outlet of the through cavity 15 is correspondingly fitted with the second vent hole 16. The second vent hole 16 is opened around the bottom of the frame 1. The second vent hole 16 expands the air flow space at the bottom during casting. The box rib 14 is set as a crisscross mesh structure, and the box rib 14 can reduce the amount of sand swallowed by the bottom box.

[0034] refer to Figure 4 - Figure 6 , Figure 10 Figure 13 and Figure 16 As shown, the working principle of the box reinforcement 14 is reflected in two aspects: sand reduction: the mesh structure of the box reinforcement 14 occupies a part of the space above the movable base plate 3. During molding, this part of the space does not need to be filled with resin sand, thereby reducing the amount of sand consumed by the bottom box. At the same time, the box reinforcement 14 provides a supporting skeleton for the resin sand layer, reducing the filling thickness of the resin sand while ensuring the load-bearing strength. Heat dissipation: the box reinforcement 14 has a through cavity 15 inside, which extends along the direction of the box reinforcement 14. Its outlet is correspondingly fitted with the second vent hole 16 opened around the bottom of the frame 1. After casting, the heat of the casting is transferred to the resin sand layer and the box reinforcement 14 at the bottom. The air in the through cavity 15 is heated and expands, forming natural convection. The hot air flows along the through cavity 15 to the second vent hole 16 and is discharged outside the frame 1, forming an airflow heat dissipation channel at the bottom. The second vent hole 16 expands the air circulation space at the bottom during casting, forming an exhaust heat dissipation system that echoes the first vent hole 8.

[0035] Specifically, the vibration compaction assembly includes a striking plate 17 hinged to the outer perimeter of the frame 1. A torsion spring 18 and a cable 19 are installed at the hinge of the striking plate 17. The top of the cable 19 is fixedly connected to the bottom of the collar 20. The collar 20 is slidably mounted on the top outer side of the frame 1 and can slide vertically by manual pushing. The striking plate 17 generates a striking vibration on the frame 1 through the torsion spring 18, the cable 19, and the collar 20. Limiting blocks 21 are installed on the inner walls of the collar 20. The limiting blocks 21 are slidably connected to the limiting grooves 22 opened on the outer perimeter of the frame 1. The sliding range of the collar 20 and the installation of the striking plate 17 both avoid the space where the first vent 8 is located. The striking plate 17 is set in an "L" shape.

[0036] refer to Figure 1 - Figure 5 , Figure 7 , Figures 11-12 and Figure 14 As shown, the vibration compaction component is the core mechanism for achieving manual vibration compaction during the sand filling stage. The limiting block 21 is slidably connected to the limiting groove 22 opened around the outside of the frame 1, so that the collar 20 can only slide vertically and cannot rotate. Its specific working process is as follows: During the sand filling stage, after the operator fills the resin sand into the frame 1, he holds the collar 20 and pulls it vertically upward. The collar 20 slides upward along the limiting groove 22. Through the pull cable 19, the top of the striking plate 17 is pulled, overcoming the elastic force of the torsion spring 18, causing the striking plate 17 to swing towards the side wall of the frame 1, which is in the energy storage stage. When the operator releases the collar 20, the collar 20 slides downward along the limiting groove 22 under its own gravity. Reset, cable 19 loosens, torsion spring 18 releases stored elastic potential energy, driving striking plate 17 to swing rapidly away from frame 1. The bottom of striking plate 17 impacts the side wall of frame 1 with a certain impact force, generating impact vibration. This impact vibration is transmitted through the side wall of frame 1 to the internal resin sand layer, causing the resin sand particles to rearrange, flow and become denser under the vibration, reducing the gaps between particles. The operator can repeatedly push and pull collar 20 to achieve multiple taps until the resin sand reaches the required compactness. The installation position of striking plate 17 and the sliding range of collar 20 are both avoided in the space where the first vent 8 is located, ensuring that the tapping vibration will not interfere with the structure of the temperature control exhaust assembly.

[0037] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0038] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A base box for resin sand casting, comprising a square frame (1) and a base plate module, characterized in that: The base plate module consists of a square base plate frame (2) and an inner hinged movable base plate (3). The inner wall of the frame (1) is provided with support platforms (7) at equal intervals, and the support platforms (7) are provided with a first ventilation hole (8) that penetrates the side wall of the frame (1). Cooling pipes (9) are laid in the inner wall of the frame (1), and the input and output ends of the cooling pipes (9) are alternately distributed at the top and bottom of the side of the frame (1). A temperature control adjustment component is provided in the inner wall of the frame (1). The temperature control adjustment component controls the opening and closing of the first vent (8) by temperature change. A sand-reducing heat dissipation layer is laid on the movable base plate (3). The sand-reducing heat dissipation layer improves the molding efficiency by expanding the airflow channel. A vibration compaction component is provided on the outside of the frame (1). The vibration compaction component reduces the gap between sand particles by tapping and vibrating. The top of the frame (1) is provided with hanging ears for easy hoisting. The bottom of the frame (2) is provided with feet. When the movable base plate (3) is closed, it forms a bearing plane with the frame (1). The bottom of the movable base plate (3) is fixed by the connector (4) and the lock. The connector (4) is set as a fan-shaped structure. When the connector (4) is closed, it forms a circle. The connector (4) is provided with a through hole. The lock is a pin. The pin passes through the through hole to fix the opposite movable base plate (3). The temperature control adjustment component includes a closed cavity (10) opened in the inner wall of the square frame (1), and a heat-absorbing plate (11) is installed at the bottom of the closed cavity (10). A memory metal (12) is installed on the top of the heat-absorbing plate (11), and a sealing plate (13) is fixed on the top of the memory metal (12). The sealing plate (13) is slidably connected to the middle of the first vent (8). The sealing plate (13) is set as a strip and covers the area of ​​the first vent (8). During casting, the heat-absorbing plate (11) absorbs heat, and the deformation of the memory metal (12) causes the sealing plate (13) to move down, making room for the flow of the first vent (8). During sand filling, there is no heat source. The memory metal (12) recovers and causes the sealing plate (13) to move up to block the first vent (8) and prevent resin sand leakage. The sand-reducing heat dissipation layer includes a box rib (14) fixed to the top of the movable base plate (3). The box rib (14) has a through cavity (15) inside, and the outlet of the through cavity (15) is fitted to the second vent (16). The second vent (16) is opened around the bottom of the frame (1). The second vent (16) expands the air flow space at the bottom during casting. The top of the frame (1) is equipped with a positioning block (5), and the positioning block (5) is press-fitted with the positioning groove (6). The positioning groove (6) is opened around the top of the base plate frame (2). The base plate frame (2) is set as a hollow structure, and a third vent (23) for heat dissipation is opened through the outside of the base plate frame (2). The vibration assembly includes a striking plate (17) hinged to the outside of the frame (1), and a torsion spring (18) and a cable (19) are installed at the hinge of the striking plate (17). The top of the cable (19) is fixedly connected to the bottom of the collar (20). The collar (20) is slidably disposed on the top outside of the frame (1) and can slide vertically by manual pushing.

2. The bottom box for resin sand casting according to claim 1, characterized in that: The support platform (7) realizes the layered shape inside the bottom box. The support platforms (7) of different heights are used to adapt to castings of different sizes and shapes. The support platform (7) is provided with anti-slip texture. The first vent hole (8) establishes the exhaust passage of the square frame (1) during casting.

3. The bottom box for resin sand casting according to claim 1, characterized in that: The box reinforcement (14) is set as a crisscross mesh structure, and the box reinforcement (14) can reduce the amount of sand swallowed by the bottom box.

4. The bottom box for resin sand casting according to claim 1, characterized in that: The striking plate (17) generates a striking vibration on the frame (1) through a torsion spring (18), a cable (19) and a collar (20). A limiting block (21) is installed on the inner wall of the collar (20). The limiting block (21) is slidably connected to the limiting groove (22) opened on the outer perimeter of the frame (1). The sliding range of the collar (20) and the installation of the striking plate (17) both avoid the space where the first vent (8) is located. The striking plate (17) is set as an "L" shaped structure.

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