Sand core box convenient for drawing

Abstract

The invention discloses a sand core box convenient to draw, and relates to the technical field of sand core boxes, the sand core box convenient to draw comprises a large sand core box, a small sand core box, a side supporting frame and a lower supporting frame, the side supporting frame is used for filling a gap in the side face between the small sand core box and a sand core box frame, and the lower supporting frame is used for supporting the small sand core box. The lower supporting frame is used for supporting large sand core boxes and small sand core boxes with the height smaller than that of the sand core box, pressing grooves with the same height are formed in the sides, close to the sand core box frame, of the side supporting frame, the multiple large combination plates and the multiple small combination plates, and abutting plates are movably arranged in the mounting grooves; pressing plates used for pushing the pressing grooves downwards are arranged on the abutting plates. The sand core box has the advantages that the sand core box frame and the molding bottom plate form a uniform-size frame, meanwhile, the large sand core box and the small sand core box are of a spliced structure, the splicing number can be flexibly adjusted to be matched with a special-shaped casting structure, the sand core box is accurately in butt joint with a turnover drawing machine, and the same production line can be stably compatible with production of special-shaped castings of different sizes and structures.

Description

Technical Field

[0001] This invention relates to the field of sand core box technology, and more particularly to a sand core box that is easy to demold. Background Technology

[0002] Sand core casting, as a process for achieving integrated molding of complex internal cavities and irregular shapes in irregularly shaped castings, directly determines the production capacity of irregularly shaped castings based on its technological maturity. Currently, intelligent manufacturing technology is rapidly penetrating the casting field, and intelligent casting islands, as integrated, automated, and digital core production units, have become an important development direction for the large-scale production of irregularly shaped castings. However, their efficient operation is still limited by the adaptability and functionality of key equipment, and sand core boxes are one of the core constraints.

[0003] In this process, irregularly shaped sand cores need to be formed by splicing sand core boxes. Multiple customized splicing plates are combined to simulate the internal cavity structure of the casting. As the basic equipment for bearing, transporting and demolding the splicing sand core boxes, the adaptability, compatibility and demolding convenience of the sand core boxes directly affect the continuous production capacity of the intelligent casting island, and have become the core bottleneck restricting the efficient operation of the large-scale production line of irregularly shaped castings.

[0004] Currently, the production of irregular-shaped castings faces a dual challenge: On the one hand, the adaptability of production lines is extremely poor. Traditional sand core boxes adopt a fixed-size design, and the internal space and support structure cannot be adjusted. They can only be adapted to a single specification of spliced ​​sand core boxes. This means that when switching production lines, the splicing plates and sand core boxes must be replaced simultaneously. This not only requires stopping the production line to complete cumbersome procedures such as hoisting the old box and calibrating the new box, but also requires companies to invest a lot of money to purchase multiple sets of box maintenance and storage equipment. At the same time, it occupies a huge amount of workshop space, making it difficult for irregular-shaped castings to be integrated into large-scale production lines. On the other hand, the demolding process is extremely inconvenient. The traditional sand core boxes are poorly compatible with the production line's flipping demolding machine. The positioning interfaces and heights of boxes of different sizes are different, requiring frequent adjustments to the clamping parameters of the demolding machine, further increasing the difficulty of demolding and the sand core breakage rate. Therefore, a sand core box that is easy to demold is needed. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a sand core box that facilitates demolding, solving the problems mentioned in the background art. Traditional fixed-size sand core boxes can only be adapted to single-specification spliced ​​sand core boxes, resulting in cumbersome box replacements during production line switching, high investment, and large space occupation. In addition, they have poor compatibility with flipping demolding machines, high demolding difficulty, and high sand core breakage rate.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A sand core box that is easy to demold includes a molding base plate, a sand core box frame and several connecting corner pieces. The molding base plate and the sand core box frame are connected as one unit by several connecting corner pieces to form a placement cavity. The structure includes a large sand core box, a small sand core box, a side support frame, and a lower support frame located within the placement cavity. The side support frame fills the gap between the small sand core box and the sand core box frame on the side. The lower support frame supports the large and small sand core boxes, which are shorter than the sand core box itself, ensuring that the upper surfaces of the large and small sand core boxes are aligned with the upper surface of the sand core box frame. The large sand core box is composed of several large composite panels, and the small sand core box is composed of several small composite panels. Each of the side support frame, the large composite panels, and the small composite panels has a pressure groove of equal height on the side closest to the sand core box frame. Each of the four inner side walls of the sand core box frame has an installation groove, and each installation groove has a movable abutment plate. Each abutment plate has a pressure plate for pushing the pressure groove downwards.

[0007] Furthermore, a supporting cylinder is fixedly connected to the side wall of the sand core box frame. The driving end of the supporting cylinder is set towards the center of the sand core box frame, and its end is fixedly connected to the supporting plate. The supporting plate is located in the corresponding mounting groove. A groove is opened at one end of the supporting plate near the center of the sand core box frame. A telescopic cylinder is fixedly connected to the inner cavity of the groove. The driving end of the telescopic cylinder is set towards the molding base plate, and its end is connected to a pressure plate. The pressure plate cooperates with the pressure groove.

[0008] Furthermore, a plurality of sliding sleeves are distributed through the pressure plate, a plurality of fixed rods are provided inside the groove, and a plurality of abutting rollers are rotatably connected inside the sliding sleeves along the circumferential direction. The sliding sleeves are fitted on the outside of the corresponding fixed rods, and the plurality of abutting rollers abut against the outer wall of the corresponding fixed rods.

[0009] Furthermore, a number of support rollers are distributed at the top of the abutment plate, and all of the support rollers are in contact with the inner sidewall of the mounting groove.

[0010] Furthermore, the side of the molding base plate away from the sand core box frame is provided with a mating part that cooperates with the production line or the flipping mold release machine.

[0011] Furthermore, a pressing element is provided between the top of the large composite panel and the top of the small composite panel that are attached to each other. The pressing element includes a protruding strip, which is fixed on the side of the large composite panel near the small composite panel. A groove is formed on the side of the small composite panel near the large composite panel, and the protruding strip engages with the groove.

[0012] Furthermore, elastic ropes are provided between adjacent large composite panels and between adjacent small composite panels.

[0013] Compared with existing technologies, the advantages of this invention are: 1. The sand core box frame and the molding base plate of this invention form a unified size frame. Only the side support frame and the lower support frame need to be replaced according to the size of the irregular sand core, without replacing the entire box. At the same time, the large and small sand core boxes adopt a splicing structure, which can flexibly adjust the number of splices to adapt to complex casting structures. This design completely breaks the limitation of the traditional one casting, one box. In the flexible production scenario of the intelligent casting island, the same production line can stably and compatiblely produce irregular castings of different sizes and structures, truly meeting the multi-variety and large-scale production needs of the intelligent casting island, and solving the core pain point of poor adaptability and difficulty in switching to the production of irregular castings in traditional production lines.

[0014] 2. This invention optimizes both mold adaptability and subsequent operational convenience. On the one hand, the sand core box adopts a uniform size design, which, together with the matching parts of the molding base plate, can accurately connect with the flipping mold release machine. During mold release, the large and small sand core boxes can be stably removed from the sand core box frame, avoiding mold release jamming or sand core damage due to mismatched box sizes. On the other hand, the large sand core box is spliced ​​from large combination plates, and the small sand core box is spliced ​​from small combination plates. After mold release, the spliced ​​plates can be manually disassembled to obtain the complete sand core. The disassembly difficulty is low, and the series design of the elastic rope keeps the spliced ​​plates in relative position after disassembly, reducing the risk of component loss. There is no need for repeated alignment during reassembly, further reducing the intensity of manual operation, ensuring efficient connection of the process after mold release, and improving overall production efficiency.

[0015] 3. This invention strengthens the tightness of splicing plate connections through multiple structural designs. From the perspective of lateral compression, the supporting cylinder on the side wall of the sand core box frame drives the supporting plate to move towards the center of the frame, compressing the large and small combined plates. The limiting rod on the side of the supporting plate prevents the supporting plate from tilting, ensuring uniform lateral pressure and effectively reducing the gap between splicing plates. From the perspective of vertical pressing, the telescopic cylinder in the groove of the supporting plate drives the pressing plate to move downward, precisely cooperating with the side support frame and the pressing groove on the splicing plate to achieve tight vertical pressing and avoid core sand leakage under high pressure. For splicing plates that are not adjacent to the side wall, the interlocking design of the convex strip and the groove allows the downward pressure of the large combined plate to be transmitted to the small combined plate through the convex strip when the telescopic cylinder presses the pressing groove, so that the splicing plates that are not adjacent to the side wall can also fit tightly. Even if the number of small sand core boxes increases, the pressing parts between adjacent small combined plates can still ensure the tightness of the connection, eliminating splicing gaps in all directions and ensuring the quality of sand core forming. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a sand core box that facilitates demolding, as proposed in this invention. Figure 2 for Figure 1 Schematic diagram of the structure of the medium sand core box; Figure 3 for Figure 2 Exploded view of the middle support frame; Figure 4 for Figure 2 Top view; Figure 5 for Figure 4 A cross-sectional view along the AA direction; Figure 6 for Figure 5 Enlarged structural diagram at point B; Figure 7 for Figure 2 Internal structure diagram; Figure 8 for Figure 7 Another structural diagram of the middle support panel; Figure 9 for Figure 8 A partial structural diagram of the intermediate pressure plate.

[0017] In the diagram: 1. Shaping base plate; 2. Sand core box frame; 3. Large sand core box; 31. Large combination plate; 32. Raised strip; 4. Small sand core box; 41. Small combination plate; 42. Groove; 5. Side support frame; 6. Lower support frame; 7. Connecting corner piece; 8. Mounting groove; 81. Holding cylinder; 82. Support plate; 83. Limiting rod; 84. Groove body; 9. Telescopic cylinder; 91. Pressure plate; 92. Fixing rod; 93. Sliding sleeve; 94. Holding roller; 95. Supporting roller; 10. Pressing groove; 11. Mating part. Detailed Implementation

[0018] Reference Figures 1-9A sand core box for easy demolding includes a molding base plate 1, a sand core box frame 2, and several connecting corner pieces 7. The molding base plate 1 and the sand core box frame 2 are connected as one unit by the connecting corner pieces 7. The molding base plate 1 and the sand core box frame 2 together form a placement cavity. The molding base plate 1 is used to support the sand core box frame 2 above and the contents. The sand core box also includes a large sand core box 3, a small sand core box 4, a side support frame 5, and a lower support frame 6 located in the placement cavity. In order to further improve the ease of fitting the large sand core box 3 and the small sand core box 4 with the sand core box, and to ensure that they achieve better results in assembly, adjustment, and space utilization, the large sand core box 3 and the small sand core box 4 are both designed with a regular square structure. This shape choice forms a precise structural match with the square placement cavity formed by the molding base plate 1 and the sand core box frame 2 inside the sand core box. This not only allows the large sand core box 3 and the small sand core box 4 to be stably and tightly embedded in the placement cavity, but also avoids assembly misalignment or space waste caused by irregular shapes. It can also provide a stable foundation for the adaptation and adjustment of the side support frame 5 and the lower support frame 6. The side support frame 5 is used to fill the gap between the small sand core box 4 and the sand core box frame 2 on the side. The lower support frame 6 is used to support the large sand core box 3 and the small sand core box 4 with a height smaller than the sand core box box. It supports the upper surface of the large sand core box 3 and the small sand core box 4 and the upper surface of the sand core box frame 2 on the same plane, so that the upper surfaces of multiple sand core boxes of different sizes are on the same plane. From the perspective of the production line, only one size of sand core box box is running. In the automated process of the intelligent casting island, the standardized sand core box box achieves precise grasping and transfer through the positioning groove and electromagnetic induction interface that are pre-set to match the AGV intelligent transfer vehicle. With the help of the uniform gripping points and pressure sensing modules on the side, the robotic arm can grasp quickly and accurately. Relying on the standardized connecting buckle and height calibration mark on the top, the flipping mold release machine can be quickly fixed and automatically matched with the flipping angle and clamping force to ensure the production cycle and collaborative efficiency of the intelligent casting island. This solution utilizes the interchangeable design of the side support frame 5 and the lower support frame 6. Only the support frame of the corresponding specification needs to be replaced according to the size changes of the irregular sand cores (i.e., the large sand core box 3 and the small sand core box 4), without replacing the entire sand core box box. The basic frame composed of the sand core box frame 2 and the molding base plate 1 has uniform dimensions, always presenting a single-size box from the production line perspective. This ensures stable compatibility with the production line's conveyor rails and positioning system. Furthermore, the large sand core box 3 and the small sand core box 4 adopt a splicing structure, allowing adjustment of the splicing quantity and combination method according to the complex structure of the irregular castings. This further expands the production line's compatibility with irregular castings, enabling the same... One production line can continuously produce irregularly shaped castings of different sizes and structures, truly realizing the large-scale compatible production of irregularly shaped castings. The basic frame composed of sand core box frame 2 and molding base plate 1 has uniform dimensions. After the replaceable side support frame 5 and lower support frame 6 are adapted to sand core boxes of different sizes, they can still maintain the consistency of adaptation with the flipping mold release machine. There is no need to adjust the clamping parameters, flipping angle or positioning position of the mold release machine due to changes in sand core size. The uniform specification frame with assembled sand core boxes can be directly fed into the mold release machine to quickly start the mold release process, greatly shortening the equipment debugging time and improving the efficiency of mold release operation.

[0019] The large sand core box 3 is composed of several large composite plates 31, and the small sand core box 4 is composed of several small composite plates 41. The figure is only for illustration. The composition of the large sand core box 3 and the small sand core box 4 is not limited to five plates. Depending on the process requirements, they may be composed of more side plates. The side support frame 5, the several large composite plates 31, and the several small composite plates 41 are all provided with pressure grooves 10 of the same height on the side near the sand core box frame 2. The four inner side walls of the sand core box frame 2 are provided with mounting grooves 8. The mounting grooves 8 are movably installed with abutment plates 82 inside each mounting groove. The four abutment plates 82 are used to press the spliced ​​plates and reduce the gaps between the spliced ​​plates. Several limiting rods 83 are provided on the side of the abutment plates 82. The limiting rods 83 are all inserted into the sand core box frame 2 to prevent the abutment plates 82 from tilting. Each abutment plate 82 is provided with There is a pressure plate 91 for pushing the pressure groove 10 downward. The molding base plate 1 is provided with a mating part 11 on the side away from the sand core box frame 2, which cooperates with the production line or the flipping mold release machine. Multiple sand core boxes of the same size are provided and used in conjunction with the production line and the flipping mold release machine. After the mold is released in the flipping mold release machine, the large sand core box 3 and the small sand core box 4 are removed from the sand core box frame 2. After the plates that make up the large sand core box 3 and the small sand core box 4 are disassembled manually, the sand core will be generated completely. The disassembled large combination plate 31 and small combination plate 41 are manually put into the corresponding large sand core box 3 and small sand core box 4 for use in the next cycle of the production line. The production of self-hardening sand cores is realized on the production line. The production speed is fast, the footprint is small, the repeatability is high, and multiple pieces can be produced in one box, which reduces the labor intensity of workers and improves the production efficiency.

[0020] like Figure 6 or Figure 7As shown, to enhance the locking force between the multiple large composite plates 31 and the multiple small composite plates 41, a retaining cylinder 81 is fixedly connected to the side wall of the sand core box frame 2. The driving end of the retaining cylinder 81 is positioned towards the center of the sand core box frame 2, and its end is fixedly connected to the retaining plate 82. The retaining plate 82 is located in the corresponding mounting groove 8. A groove 84 is opened at one end of the retaining plate 82 near the center of the sand core box frame 2. A telescopic cylinder 9 is fixedly connected to the inner cavity of the groove 84. The driving end of the telescopic cylinder 9 is positioned towards the molding base plate 1, and its end is connected to a pressure plate 91. The supporting cylinder 81 on the side wall of the sand core box frame 2 drives the abutment plate 82 to move towards the center of the frame. The abutment plate 82 laterally presses the large combined plate 31 and the small combined plate 41. The telescopic cylinder 9 in the groove 84 drives the pressure plate 91 to move downward, precisely cooperating with the pressure groove 10. The pressure is applied from both the side and vertical sides, which enhances the locking force between the splicing plates and prevents the core sand from easily leaking from the splicing point under high pressure. The automated drive improves the locking efficiency, reduces manual intervention, further ensures the quality of sand core forming, and reduces the defect rate of sand core caused by core sand leakage.

[0021] like Figure 8 or Figure 9 As shown, to increase the service life of the pressure plate 91, several sliding sleeves 93 are distributed through the pressure plate 91. Several fixed rods 92 are installed inside the groove 84. Several abutting rollers 94 are rotatably connected inside the sliding sleeves 93 in the circumferential direction. The sliding sleeves 93 are sleeved on the outside of the corresponding fixed rods 92. The abutting rollers 94 all abut against the outer wall of the corresponding fixed rods 92. When the sliding sleeves 93 and the fixed rods 92 slide relative to each other, the abutting rollers 94 can roll up and down along the outer wall of the fixed rods 92. When the pressure plate 91 presses against the pressure groove 10, the pressure plate 91 is subjected to an upward reaction force. At this time, the squeezing force between the abutting rollers 94 and the fixed rods 92 increases. When the sliding sleeves 93 and the fixed rods 92 slide relative to each other, the abutting rollers 94 roll. By converting sliding friction into rolling friction, the wear of the fixed rod 92 is reduced, and the structure of the supporting roller 94 can better withstand radial force, optimizing the stress distribution of the overall structure and improving the load-bearing capacity of the components. Several supporting rollers 95 are distributed at the top of the abutment plate 82, and all of the supporting rollers 95 are in contact with the inner wall of the mounting groove 8. When the pressure plate 91 is subjected to an upward oblique force, it will transfer the upward oblique force to the abutment plate 82. The supporting rollers 95 at the top of the abutment plate 82 are in contact with the inner wall of the mounting groove 8. When the pressure plate 91 is subjected to an oblique reaction force and transferred to the abutment plate 82, the supporting rollers 95 disperse the pressure and prevent the abutment plate 82 from tilting, reducing the shear force at the connection between the abutment plate 82 and the supporting cylinder 81, reducing equipment maintenance costs, and ensuring the long-term stable operation of the production line.

[0022] like Figure 5 or Figure 7As shown, to facilitate downward pressure on the small combined plate 41 that is not adjacent to the side wall of the sand core box frame 2, a pressing element is provided between the top of the large combined plate 31 and the top of the small combined plate 41. The pressing element includes a protrusion 32, which is fixed on the side of the large combined plate 31 near the small combined plate 41. A groove 42 is provided on the side of the small combined plate 41 near the large combined plate 31. The protrusion 32 engages with the groove 42. The protrusion 32 of the large combined plate 31 engages with the groove 42 of the small combined plate 41. The telescopic cylinder 9 drives the pressure plate 91 to press the large combined plate 31 downward. When the pressure groove 10 is pressed, the large combined plate 31 transmits the downward pressure to the small combined plate 41 through the protrusion 32. When the number of small sand core boxes 4 increases, the protrusion 32 and the groove 42 are added between adjacent small combined plates 41 to cooperate with each other to realize the linkage pressing of multiple splicing plates, solve the problem that adjacent splicing plates that are not on the side wall are difficult to be pressed. The pressure is transmitted through the cooperation of the protrusion 32 and the groove 42, which enhances the tightness of all splicing plate connections, eliminates sealing blind spots, eliminates the need for additional pressing mechanisms, simplifies the structural design, ensures that the molding accuracy of each part of the sand core is consistent, and further reduces the risk of sand core breakage.

[0023] To reduce manual assembly time, elastic ropes (not shown in the figure) are installed between adjacent large assembly plates 31 and between adjacent small assembly plates 41. Holes for installing the elastic ropes are provided on the large assembly plates 31 and the small assembly plates 41. Connecting the elastic ropes can link adjacent splicing plates together as a whole. Even after disassembly, they can maintain relative positional connection, reducing the risk of losing individual parts. When the splicing plates are disassembled and reassembled, the ropes can guide the adjacent plates back to their original relative positions by pulling and limiting, reducing manual alignment time and further improving the overall efficiency of the production line. The elastic setting allows the elastic ropes to retract into the holes when there is no external force pulling, avoiding their presence between adjacent splicing plates and affecting the tightness between the splicing plates.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A sand core box that facilitates demolding, characterized in that, include: The base plate (1), the sand core box frame (2) and several connecting corner pieces (7) are connected together by several connecting corner pieces (7) to form a placement cavity; The large sand core box (3), small sand core box (4), side support frame (5), and lower support frame (6) are located in the placement cavity. The side support frame (5) is used to fill the gap between the small sand core box (4) and the sand core box frame (2) on the side. The lower support frame (6) is used to support the large sand core box (3) and the small sand core box (4), which are less than the height of the sand core box box. The upper surfaces of the large sand core box (3) and the small sand core box (4) are supported on the same plane as the upper surface of the sand core box frame (2). The large sand core box (3) is composed of several large composite plates (31). The small sand core box (4) is assembled from several small combination plates (41). The side support frame (5), several large combination plates (31), and several small combination plates (41) are all provided with pressure grooves (10) of the same height on the side near the sand core box frame (2). The four inner side walls of the sand core box frame (2) are provided with mounting grooves (8). The mounting grooves (8) are movably provided with abutment plates (82) inside each mounting groove (8). The abutment plates (82) are provided with pressure plates (91) for pushing the pressure grooves (10) downward.

2. The sand core box for easy demolding according to claim 1, characterized in that, A holding cylinder (81) is fixedly connected to the side wall of the sand core box frame (2). The driving end of the holding cylinder (81) is set towards the center of the sand core box frame (2), and the end is fixedly connected to the abutment plate (82). The abutment plate (82) is located in the corresponding mounting groove (8). A groove (84) is opened at one end of the abutment plate (82) near the center of the sand core box frame (2). A telescopic cylinder (9) is fixedly connected to the inner cavity of the groove (84). The driving end of the telescopic cylinder (9) is set towards the molding base plate (1), and the end is connected to a pressure plate (91). The pressure plate (91) cooperates with the pressure groove (10).

3. A sand core box for easy demolding according to claim 2, characterized in that, A plurality of sliding sleeves (93) are distributed through the pressure plate (91), and a plurality of fixed rods (92) are provided inside the groove (84). A plurality of abutting rollers (94) are rotatably connected inside the sliding sleeves (93) in the circumferential direction. The sliding sleeves (93) are sleeved on the outside of the corresponding fixed rods (92), and the plurality of abutting rollers (94) abut against the outer wall of the corresponding fixed rods (92).

4. A sand core box for easy demolding according to claim 2, characterized in that, The top of the abutment (82) has a number of support rollers (95), and the support rollers (95) are all in contact with the inner sidewall of the mounting groove (8).

5. A sand core box for easy demolding according to claim 1, characterized in that, The molding base plate (1) is provided with a fitting part (11) on the side away from the sand core box frame (2) to cooperate with the production line or the flipping mold release machine.

6. A sand core box for easy demolding according to claim 1, characterized in that, A pressing member is provided between the top of the large combined plate (31) and the top of the small combined plate (41) that are attached to each other. The pressing member includes a protrusion (32). The protrusion (32) is fixed on the side of the large combined plate (31) near the small combined plate (41). A groove (42) is opened on the side of the small combined plate (41) near the large combined plate (31). The protrusion (32) engages with the groove (42).

7. A sand core box for easy demolding according to claim 1, characterized in that, Elastic ropes are provided between adjacent large combination plates (31) and between adjacent small combination plates (41).

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