Large cylindrical base casting manufacturing apparatus and method based on furan resin sand process

Abstract

The present application relates to furan resin sand process technical field, specifically to be based on furan resin sand process Large cylindrical base casting manufacturing device and method, including: mechanical arm, the execution end of the mechanical arm is installed with sand blasting head, the inlet end of the sand blasting head is fixedly connected with split pipe, and the inlet end of split pipe is fixedly connected with two output pipes respectively.The present application, realize the inside and outside layer of large cylindrical base casting molding new and old sand switching, single motor drive can complete two-way sand pipe synchronous opening and closing, without manual pipe sand, improve the overall modeling processing efficiency, after the pipeline is closed, the airflow nozzle can be automatically extended to spray high pressure airflow, blow off the residual furan resin sand in the pipeline, reduce the resin sand retention pipeline solidification agglomeration, reduce the pipeline blockage failure, after the pipeline is closed, the backflow pipe can be synchronously conducted, the retained resin sand is uniformly guided and recycled, reduce the furan resin sand raw material loss, save the modeling consumables.

Description

Technical Field

[0001] This invention relates to the field of furan resin sand process technology, specifically to a manufacturing apparatus and method for large cylindrical base castings based on furan resin sand process. Background Technology

[0002] Furan resin sand casting is a mainstream self-hardening sand molding process in the foundry industry. This process uses furan resin as a binder, combined with a special curing agent to modify the raw sand. The mixed sand can self-cure at room temperature, resulting in sand molds with high strength, minimal deformation, and high replication accuracy, meeting the dimensional accuracy and appearance quality requirements of large, irregularly shaped castings. Compared to traditional processes such as wet molding sand and water glass sand, furan resin sand offers excellent collapsibility, convenient demolding and cleaning of castings, eliminates the need for high-temperature drying and curing, and has a short production cycle, making it suitable for large-scale casting production of large and heavy components.

[0003] Large cylindrical bases are pressure-bearing large ring castings. These castings have large outer diameters, require high uniformity of wall thickness, and demand strict assembly precision. The casting industry commonly employs a layered, differentiated molding process. The outer surface of the cylindrical base, in contact with the molten metal and forming the outer appearance, uses newly molded furan resin sand to ensure the smoothness and dimensional accuracy of the casting's outer wall, avoiding sand adhesion and porosity defects. The inner surface of the cylindrical base, which is the non-assembly pressure-bearing surface, uses recycled furan resin sand for molding. This reduces the overall cost of molding sand while ensuring the strength of the sand mold support. This layered molding method, combining new and old sand, has become a common process for cost-effective casting of large cylindrical bases.

[0004] However, in current layered molding production, the industry generally adopts a split-type dual-pipe, dual independent sandblasting nozzle and robotic arm linkage operation structure. The two pipes are connected to the new sand bin and the old sand recycling bin respectively, and each is equipped with an independent sandblasting nozzle. The robotic arm switches positions to complete the layered molding operation of spraying new sand on the outer layer and old sand on the inner layer. However, the dual pipes and dual nozzles are completely independently deployed, requiring two sets of independent valve control drive mechanisms. Moreover, furan resin sand contains resin binding components. After a single pipe is shut down and the material is cut off, a large amount of sand remaining on the pipe wall will quickly harden and solidify into clumps, clogging the pipe.

[0005] Therefore, a manufacturing apparatus and method for large cylindrical base castings based on furan resin sand process is proposed to solve the problems mentioned above. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a manufacturing apparatus and method for large cylindrical base castings based on furan resin sand technology. This method can solve the problem of high costs associated with setting up two independent valve-controlled drive mechanisms, and can also solve the problem of rapid self-hardening and agglomeration of residual sand on the pipe wall, which can clog the pipe.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a manufacturing device for a large cylindrical base casting based on furan resin sand process, comprising: a robotic arm, wherein a sandblasting head is installed at the execution end of the robotic arm, a split pipe is fixedly connected to the inlet end of the sandblasting head, and two output pipes are fixedly connected to the inlet ends of the split pipes respectively, two fixed plates are fixedly connected between the two output pipes respectively, and a flexible shaft is rotatably connected to the middle area of ​​the two fixed plates, and rotating rods are fixedly connected to both ends of the flexible shaft respectively, and a pin is provided at one end of each of the two rotating rods; Two output tubes are respectively provided with a first stop and a second stop at both ends, and valve plates are installed on both first stop and second stop. The valve plates of the two first stopes are fixedly connected to a moving frame, and the valve plates of the two second stopes are fixedly connected to another moving frame. The two moving frames cooperate with the outer surface of the pin head. The inner wall of the first truss is fixedly connected to a first protective cover, and a plurality of airflow nozzles are passed through the first protective cover. The upper ends of the plurality of airflow nozzles are fixedly connected to a fixing frame, and the fixing frame and the upper side of the inner wall of the first protective cover are equipped with a connecting mechanism. A limiting rod passes through the second cut-off seat, and a slider is rotatably connected to one end of the limiting rod located on the outside of the second cut-off seat. A wedge is slidably connected to the inner side of the slider. A baffle is fixedly connected to the base of the wedge through a connecting rod. A reflux mechanism is installed on the second cut-off seat, and the outer surface of the baffle cooperates with the reflux mechanism.

[0008] Preferably, the connecting mechanism includes an abutment plate and a connecting plate, with the lower side of the abutment plate and the upper side of the connecting plate hinged together. The upper side of the abutment plate is rotatably connected to the upper side of the inner wall of the protective cover, and the lower side of the connecting plate is rotatably connected to the fixing frame.

[0009] Preferably, a sealing plate is fixedly connected to the lower end of a plurality of airflow nozzles, the upper surface of the sealing plate is in close contact with the lower surface of the protective cover, the position of the abutment plate is opposite to the position of the corresponding valve plate, and a rubber membrane is provided between the abutment plate and the valve plate, the periphery of the rubber membrane being fixedly connected to the protective cover.

[0010] Preferably, a limiting rod two is fixedly connected to the lower bottom wall of the protective cover one, the outer surface of the limiting rod two is slidably connected to the fixing frame, and a spring two is provided between the lower surface of the fixing frame and the lower bottom wall of the protective cover one, and the spring two is sleeved on the outside of the limiting rod two.

[0011] Preferably, a spring is provided between one end of the limiting rod inside the second cut-off seat and the inner wall of the second cut-off seat. A protective cover is fixedly connected to the inner wall of the second cut-off seat, and the spring is located inside the protective cover. The return mechanism includes an extension tube and a return tube, and the return tube is fixedly connected to the outer surface of the extension tube. The outer surface of the baffle is in a plug-in / plug-out fit with the extension tube.

[0012] Preferably, limit rods three are fixedly connected to both of the first and second ferrules, and the outer surfaces of the four limit rods three are slidably connected to the corresponding valve plates.

[0013] Preferably, an isolation cover is fixedly connected at the included angle between the second cut-off seat and the return pipe. The wedge is located inside the isolation cover. A guide rod is provided inside the isolation cover, and the wedge is slidably connected to the outer surface of the guide rod.

[0014] Preferably, the outer surfaces of both fixed plates are fixedly connected to isolation covers II, and the two rotating rods and the movable frame are respectively located inside the corresponding isolation covers II.

[0015] Preferably, the position of the limiting rod one is opposite to the position of the corresponding valve plate, and a rubber membrane two is provided between the limiting rod one and the valve plate. The periphery of the rubber membrane two is fixedly connected to the protective cover two. A motor is fixedly connected to the lower surface of the fixed plate located in the lower layer. The output end of the motor is fixedly connected to the flexible shaft. A guide groove is provided on the inner side of the moving frame, and the pin head is located inside the guide groove.

[0016] This invention also proposes a method for manufacturing large cylindrical base castings based on furan resin sand process, and a manufacturing apparatus for large cylindrical base castings based on furan resin sand process: S1. The mechanical arm drives the sandblasting head to move, and the first of the two output pipes supplies new sand to the sandblasting head to spray and shape the outer layer of the large cylindrical base. S2. When it is necessary to switch to old sand to manufacture the inner layer of the cylindrical base, start the motor to drive the flexible shaft to rotate. The rotating rods at both ends of the flexible shaft drive the two moving frames to move simultaneously through the pins. S3. The two moving frames push the valve plates on the first and second cut-off seats corresponding to the first output pipe to move in the closing direction, cutting off the supply of new sand. At the same time, the two moving frames pull the valve plates on the second and second cut-off seats corresponding to the second output pipe to move in the opening direction, so that the old sand enters the sandblasting head through the second output pipe and begins to manufacture the inner layer of the cylindrical base. S4. The valve plate inside the first output pipe's seat squeezes the rubber diaphragm, which pushes the fixing frame down through the abutment plate and connecting plate, causing several airflow nozzles to extend out of the protective cover and continuously spray high-pressure airflow into the first output pipe. S5. While the valve plate inside the first output pipe is closed, the valve plate inside the second output pipe squeezes the rubber diaphragm and pushes the limit rod. The limit rod slides along the wedge through the slider, causing the baffle to be pulled out from the extension pipe, so that the return pipe is open. The high-pressure airflow blows the residual new sand in the first output pipe back to the transfer box or recycling box through the return pipe, preventing the residual new sand from solidifying in the pipe. S6. When the inner layer of the cylindrical base is manufactured and it is necessary to switch back to new sand, the motor reverses and drives the flexible shaft to rotate in the opposite direction, and the two moving frames move in the opposite direction to reset. S7. The two moving frames pull the valve plates on the first and second cut-off seats corresponding to the first output pipe to move in the opening direction, restoring the supply of new sand. At the same time, the two moving frames push the valve plates on the second and second cut-off seats corresponding to the second output pipe to move in the closing direction, cutting off the supply of old sand. S8. When the internal valve plate of the first stop seat is opened, the valve plate is released from the pressure on the rubber diaphragm, the second spring pushes the fixing frame to move up and reset, so that the airflow nozzle retracts into the protective cover and stops blowing air. S9. At the same time, the valve plate inside the second cut-off seat in the first output pipe is released from the pressure on the second rubber diaphragm. The first spring pushes the first limit rod to reset. The first limit rod drives the wedge and the baffle to move in the opposite direction through the slider, so that the baffle is reinserted into the extension pipe to close the return pipe. The new sand is supplied normally to the sandblasting head through the first output pipe to continue manufacturing the outer layer of the cylindrical base.

[0017] Compared with the prior art, the present invention provides a manufacturing apparatus and method for large cylindrical base castings based on furan resin sand process, which has the following beneficial effects: 1. Enables switching between new and old sand for the inner and outer layers of large cylindrical base castings. A single motor can drive the synchronous opening and closing of two sand pipes, eliminating the need for manual pipe changing and sand adjustment, thus improving the overall molding and processing efficiency.

[0018] 2. After the pipeline is closed, the airflow nozzle can automatically extend to spray high-pressure airflow to blow away the residual furan resin sand in the pipeline, reduce the amount of resin sand that remains in the pipeline and solidifies, and reduce pipeline blockage failure.

[0019] 3. After the pipeline is closed, the return pipe can be opened simultaneously to guide and recover the stagnant resin sand in a unified manner, reducing the loss of furan resin sand raw materials and saving molding materials. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the split-tube structure of the present invention; Figure 3 This is a schematic diagram of the mobile frame structure of the present invention; Figure 4 This is a schematic diagram of the rotating rod structure of the present invention; Figure 5 For the present invention Figure 2 Enlarged view of point A; Figure 6 This is a schematic diagram of the second truss structure of the present invention; Figure 7 This is a schematic diagram of the structure of the truss of the present invention; Figure 8This is a schematic diagram of the airflow nozzle structure of the present invention.

[0021] In the diagram: 1. Robotic arm; 2. Sandblasting head; 3. Split pipe; 4. Output pipe; 401. Cutting seat one; 402. Cutting seat two; 4021. Extending pipe; 5. Fixing plate; 6. Motor; 7. Flexible shaft; 8. Rotating rod; 801. Pin head; 9. Moving frame; 901. Guide groove; 10. Valve plate; 11. Limiting rod one; 12. Spring one; 13. Sliding block; 14. Wedge; 15. Baffle; 16. Return pipe; 17. Protective cover one; 18. Abutment plate; 19. Connecting plate; 20. Fixing frame; 21. Airflow nozzle; 22. Sealing plate; 23. Limiting rod two; 24. Spring two; 25. Rubber membrane one; 26. Protective cover two; 27. Isolation cover one; 28. Isolation cover two; 29. ​​Limiting rod three; 30. Rubber membrane two. Detailed Implementation

[0022] 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.

[0023] Example: Please see Figures 1-4 The large cylindrical base casting manufacturing apparatus and method based on furan resin sand process in this embodiment includes: a robotic arm 1, a sandblasting head 2 installed at the execution end of the robotic arm 1, a split pipe 3 fixedly connected to the inlet end of the sandblasting head 2, and two output pipes 4 fixedly connected to the inlet end of the split pipe 3 respectively, two fixed plates 5 fixedly connected between the two output pipes 4 respectively, and a flexible shaft 7 rotatably connected to the middle area of ​​the two fixed plates 5, rotating rods 8 fixedly connected to both ends of the flexible shaft 7 respectively, and a pin head 801 provided at one end of each of the two rotating rods 8, and an isolation cover 28 fixedly connected to the outer surface of each of the two fixed plates 5, the two rotating rods 8 and the moving frame 9 respectively located inside the corresponding isolation cover 28, a motor 6 fixedly connected to the lower surface of the lower fixed plate 5, the output end of the motor 6 fixedly connected to the flexible shaft 7, a guide groove 901 provided on the inner side of the moving frame 9, and the pin head 801 located inside the guide groove 901.

[0024] The system utilizes a robotic arm 1 for full-area operation control. The robotic arm 1's execution end is equipped with a sandblasting head 2 as a resin sand spraying molding component. The sandblasting head 2's inlet is connected to a split pipe 3, which then branches into two output pipes 4, independently supplying new molding sand and recycled sand to meet the sand supply requirements for differentiated molding of the inner and outer layers of the casting. Two fixed plates 5 are installed between the two output pipes 4. A flexible shaft 7 is rotatably supported in the middle of the fixed plate 5. A motor 6 is mounted on the bottom surface of the lower fixed plate 5, with its output directly connected to the flexible shaft 7, driving it to rotate forward and backward. The flexible shaft 7 is fixed at both ends. The rotating rod 8 is connected to a pin 801 at its end. The pin 801 is fitted into the guide groove 901 inside the moving frame 9. The flexible shaft 7 rotates to drive the rotating rod 8 to swing in an arc. Relying on the cooperation between the pin 801 and the guide groove 901, the circular swing is converted into the horizontal linear reciprocating motion of the moving frame 9, which completes the opening and closing of the valve plate 10. At the same time, the outer sides of the two fixed plates 5 are respectively equipped with isolation covers 28 to fully enclose and protect the transmission and cooperation area of ​​the rotating rod 8, the pin 801 and the moving frame 9, isolate the sand and dust splashed by sandblasting, and ensure the stable transmission of the sand pipeline switching.

[0025] Please see Figure 2 , Figure 3 and Figure 5 Two output pipes 4 are respectively provided with a first stop 401 and a second stop 402 at both ends, and valve plates 10 are installed on both first stop 401 and second stop 402. The valve plates 10 of the two first stop 401 are fixedly connected to a moving frame 9, and the valve plates 10 of the two second stop 402 are fixedly connected to another moving frame 9. The two moving frames 9 cooperate with the outer surface of the pin head 801. Limiting rods 29 are fixedly connected to both first stop 401 and two second stop 402. The outer surfaces of the four limiting rods 29 are slidably connected to the corresponding valve plates 10.

[0026] The two output pipes 4 are respectively equipped with a first stop 401 and a second stop 402 at both ends. Each stop is equipped with a valve plate 10 that can be moved and opened and closed to control the flow of sand inside the output pipe 4. The valve plates 10 of the two first stop 401 are fixed together to a set of moving frames 9, and the valve plates 10 of the two second stop 402 are fixed together to another set of moving frames 9. The two sets of moving frames 9 are respectively engaged with the pin head 801, which can realize the synchronous closing of the valve plates 10 at both ends of one output pipe 4 and the synchronous opening of the valve plates 10 at both ends of the other output pipe 4, so as to quickly complete the switching of new and old sand supply. The outer walls of the four first stop 401 and second stop 402 are fixed with limit rods 29. The limit rods 29 slide with the corresponding valve plates 10 to directional limit the valve plates 10, constraining the valve plates 10 to move smoothly only in the horizontal direction and preventing the valve plates 10 from deviating or tilting.

[0027] Please see Figure 2 , Figure 7 and Figure 8A protective cover 17 is fixedly connected to the inner wall of the truss 401, and a plurality of airflow nozzles 21 are passed through the protective cover 17. A fixing frame 20 is fixedly connected to the upper end of the plurality of airflow nozzles 21. A connecting mechanism is assembled on the upper side of the inner wall of the fixing frame 20 and the protective cover 17. The connecting mechanism includes an abutment plate 18 and a connecting plate 19, and the lower side of the abutment plate 18 and the upper side of the connecting plate 19 are hinged together. The upper side of the abutment plate 18 is rotatably connected to the upper side of the inner wall of the protective cover 17, and the lower side of the connecting plate 19 is rotatably connected to the fixing frame 20. The lower ends of the plurality of airflow nozzles 21 are fixedly connected to the protective cover 17. A sealing plate 22 is attached, with its upper surface closely attached to the lower surface of the protective cover 17. The position of the abutment plate 18 is opposite to the position of the corresponding valve plate 10, and a rubber membrane 25 is provided between the abutment plate 18 and the valve plate 10. The rubber membrane 25 is fixedly connected to the protective cover 17 around its perimeter. A limit rod 23 is fixedly connected to the lower bottom wall of the protective cover 17. The outer surface of the limit rod 23 is slidably connected to the fixing frame 20. A spring 24 is provided between the lower surface of the fixing frame 20 and the lower bottom wall of the protective cover 17, and the spring 24 is sleeved on the outside of the limit rod 23.

[0028] The inner wall of the truss 401 is fixed with a protective cover 17. Multiple airflow nozzles 21 are arranged through the protective cover 17. Each airflow nozzle 21 is equipped with an air source interface. The air pipe connected to the air source interface extends to the outside of the truss 401. The upper ends of all airflow nozzles 21 are uniformly fixed to the fixing frame 20. The fixing frame 20 and the upper side of the inner wall of the protective cover 17 are equipped with a hinged connection mechanism. The connection mechanism consists of abutment plate 18 and a connecting plate 19 that are hinged to each other. The upper end of the abutment plate 18 is rotatably connected to the inner wall of the protective cover 17, and the lower end of the connecting plate 19 is rotatably connected to the fixing frame 20. The abutment plate 18 is arranged opposite the valve plate 10. A rubber membrane 25 that is sealed on all four sides and fixed to the protective cover 17 is installed between the two. This membrane can flexibly transmit the closing pressure of the valve plate 10 and isolate the sand in the pipe, thus protecting the connecting rod hinge structure.

[0029] A vertical limiting rod 23 is fixed to the bottom wall of the protective cover 17. The limiting rod 23 slides through the fixing frame 20, and a spring 24 supporting the fixing frame 20 is sleeved on the outside. The lower end of the airflow nozzle 21 is integrally connected to the sealing plate 22. Under normal conditions, the spring 24 lifts the fixing frame 20, and the nozzle retracts into the interior of the protective cover 17. The sealing plate 22 fits against the bottom surface of the protective cover 17, sealing the opening to prevent sand from clogging the nozzle air passage. When the valve plate 10 is closed, the valve plate 10 squeezes the rubber diaphragm 25 to press down on the abutment plate 18, and then presses down on the fixing frame 20 through the connecting plate 19. This compresses the spring 24 and drives the airflow nozzle 21 to move down and extend out of the protective cover 17, spraying high-pressure airflow into the pipe to sweep away residual sand. After the valve plate 10 is reset and opened, the squeezing pressure disappears, the spring 24 rebounds and drives the nozzle to reset and retract, stopping the purging operation.

[0030] Please see Figure 2 and Figure 6A limiting rod 11 passes through the second cut-off seat 402, and a slider 13 is rotatably connected to the end of the limiting rod 11 located on the outside of the second cut-off seat 402. A wedge 14 is slidably connected to the inner side of the slider 13. A baffle 15 is fixedly connected to the base of the wedge 14 via a connecting rod. A return mechanism is installed on the second cut-off seat 402, and the outer surface of the baffle 15 cooperates with the return mechanism. A spring 12 is provided between the end of the limiting rod 11 located inside the second cut-off seat 402 and the inner wall of the second cut-off seat 402. A protective cover 26 is fixedly connected to the inner wall of the second cut-off seat 402, and the spring 12 is located inside the protective cover 26. An isolation cover 27 is fixedly connected at an angle between the reflux pipe 16 and the isolation cover 27. The wedge 14 is located inside the isolation cover 27. A guide rod is provided inside the isolation cover 27, and the wedge 14 is slidably connected to the outer surface of the guide rod. The position of the limiting rod 11 is opposite to the position of the corresponding valve plate 10. A rubber diaphragm 30 is provided between the limiting rod 11 and the valve plate 10. The periphery of the rubber diaphragm 30 is fixedly connected to the protective cover 26. The reflux mechanism includes an extension pipe 4021 and a reflux pipe 16. The reflux pipe 16 is fixedly connected to the outer surface of the extension pipe 4021. The outer surface of the baffle 15 is inserted and pulled into the extension pipe 4021.

[0031] Among them, the second stop seat 402 is transversely connected to the first limit rod 11. The inner end of the first limit rod 11 is fitted with a spring 12 between the inner end of the second stop seat 402 and the inner wall of the second stop seat 402. The inner wall of the second stop seat 402 is fitted with a second protective cover 26 to seal and protect the spring 12, so as to avoid sand adhering and causing the spring to jam and fail. The outer end of the first limit rod 11 is rotatably fitted with a slider 13. The slider 13 slides and engages with a wedge 14. The wedge 14 is connected to a baffle 15 through a connecting rod. The second stop seat 402 and the return pipe 16 are fixed with an isolation cover 27 to house and protect the wedge 14 and the slider 13. The isolation cover 27 has a built-in guide rod to limit the axial sliding of the wedge 14 to ensure accurate displacement. The first limit rod 11 is arranged directly opposite the valve plate 10. A rubber membrane 20 is fitted between the two and fixed around the second protective cover 26, which takes into account both sealing and dust prevention and flexible force transmission. The second stop seat 402 is equipped with a return mechanism consisting of an extension pipe 4021 and a return pipe 16. The baffle 15 and the extension pipe 4021 work together to control the opening and closing of the return channel. Under normal conditions, the spring 12 pulls the limit rod 11 inward, causing the baffle 15 to insert into the extension pipe 4021 and block the return pipe 16, without affecting the normal conveying of sand. When the valve plate 10 closes the pipeline, it squeezes the rubber diaphragm 30, pushes the limit rod 11 outward, and compresses the spring 1. 12. The slider 13 slides along the inclined surface of the wedge block 14 to change direction, pulling the baffle 15 away from the extended pipe 4021, opening the return pipe 16, and cooperating with the airflow of the cut-off seat 401 to guide and recover the residual furan resin sand in the pipe, preventing the sand from solidifying and caking in the pipeline. After the valve plate 10 is reset, the spring 12 rebounds and resets the limit rod 11, the baffle 15 re-seals the extended pipe 4021, the return pipe 16 is closed, and the device returns to normal sand supply.

[0032] This invention also proposes a method for manufacturing large cylindrical base castings based on furan resin sand process, and the method, based on the aforementioned apparatus for manufacturing large cylindrical base castings based on furan resin sand process, includes the following steps: S1. The mechanical arm 1 drives the sandblasting head 2 to move, and the first output pipe 4 of the two output pipes 4 supplies new sand to the sandblasting head 2 to spray and shape the outer layer of the large cylindrical base. S2. When it is necessary to switch to old sand to manufacture the inner layer of the cylindrical base, start the motor 6 to drive the flexible shaft 7 to rotate. The rotating rods 8 at both ends of the flexible shaft 7 drive the two moving frames 9 to move simultaneously through the pin head 801. S3. The two moving frames 9 push the valve plates 10 on the first output pipe 4 corresponding to the first cut-off seat 401 and the second cut-off seat 402 to move in the closing direction, cutting off the supply of new sand. At the same time, the two moving frames 9 pull the valve plates 10 on the second output pipe 4 corresponding to the first cut-off seat 401 and the second cut-off seat 402 to move in the opening direction, so that the old sand enters the sandblasting head 2 through the second output pipe 4 and begins to manufacture the inner layer of the cylindrical base. S4. The valve plate 10 inside the first output pipe 4's cut-off seat 401 squeezes the rubber membrane 25, and pushes the fixing frame 20 down through the abutment plate 18 and the connecting plate 19, so that a number of airflow nozzles 21 extend out of the protective cover 17 and continuously spray high-pressure airflow into the first output pipe 4. S5. While the valve plate 10 inside the first output pipe 4's first stop seat 401 is closed, the valve plate 10 inside the second stop seat 402 of the first output pipe 4 squeezes the second rubber diaphragm 30 and pushes the first limit rod 11. The first limit rod 11 slides along the wedge block 14 through the slider 13, causing the baffle 15 to be pulled out from the extension pipe 4021, so that the return pipe 16 is open. The high-pressure airflow blows the residual new sand in the first output pipe 4 back to the transfer box or recycling box through the return pipe 16 to prevent the residual new sand from solidifying in the pipe. S6. When the inner layer of the cylindrical base is manufactured and it is necessary to switch back to new sand, the motor 6 reverses and drives the flexible shaft 7 to rotate in the opposite direction, and the two moving frames 9 move in the opposite direction to reset. S7. The two moving frames 9 pull the valve plates 10 on the first output pipe 4 corresponding to the first cut-off seat 401 and the second cut-off seat 402 to move in the opening direction to restore the supply of new sand. At the same time, the two moving frames 9 push the valve plates 10 on the second output pipe 4 corresponding to the first cut-off seat 401 and the second cut-off seat 402 to move in the closing direction to cut off the supply of old sand. S8. When the valve plate 10 inside the stop seat 401 is opened, the valve plate 10 is released from the pressure on the rubber diaphragm 25, and the spring 24 pushes the fixing frame 20 to move upward and reset, so that the airflow nozzle 21 retracts into the protective cover 17 and stops blowing air. S9. At the same time, the valve plate 10 inside the second cut-off seat 402 in the first output pipe 4 is released from the pressure on the second rubber diaphragm 30. The spring 12 pushes the limit rod 11 to reset. The limit rod 11 drives the wedge block 14 and the baffle 15 to move in the opposite direction through the slider 13, so that the baffle 15 is reinserted into the extension pipe 4021 to close the return pipe 16. The new sand is normally supplied to the sandblasting head 2 through the first output pipe 4 to continue manufacturing the outer layer of the cylindrical base.

[0033] The installation, connection, or setting methods disclosed in this embodiment are all common mechanical connection methods. As long as they can achieve their beneficial effects, they can be implemented. Therefore, this embodiment will not elaborate on their specific structural composition and working principle.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A manufacturing apparatus for large cylindrical base castings based on furan resin sand process, characterized in that, include: A robotic arm (1) is equipped with a sandblasting head (2) at its execution end. A split tube (3) is fixedly connected to the inlet end of the sandblasting head (2), and two output tubes (4) are fixedly connected to the inlet end of the split tube (3). Two fixed plates (5) are fixedly connected between the two output tubes (4), and a flexible shaft (7) is rotatably connected to the middle area of ​​the two fixed plates (5). Rotating rods (8) are fixedly connected to both ends of the flexible shaft (7), and a pin (801) is provided at one end of each of the two rotating rods (8). Two output pipes (4) are respectively provided with a first stop (401) and a second stop (402) at both ends, and valve plates (10) are installed on both the first stop (401) and the second stop (402). The valve plates (10) of the two first stop (401) are fixedly connected to a moving frame (9), and the valve plates (10) of the two second stop (402) are fixedly connected to another moving frame (9). The two moving frames (9) cooperate with the outer surface of the pin head (801). The inner wall of the first cut-off seat (401) is fixedly connected to the first cover (17), and a plurality of airflow nozzles (21) are passed through the first cover (17). The upper ends of the plurality of airflow nozzles (21) are fixedly connected to the fixing frame (20), and the upper side of the inner wall of the fixing frame (20) and the first cover (17) are equipped with a connecting mechanism. Limiting rod 1 (11) passes through the second cut-off seat (402), and a slider (13) is rotatably connected to one end of the limiting rod 1 (11) located outside the second cut-off seat (402). A wedge (14) is slidably connected to the inner side of the slider (13). A baffle (15) is fixedly connected to the base of the wedge (14) through a connecting rod. A return mechanism is installed on the second cut-off seat (402), and the outer surface of the baffle (15) cooperates with the return mechanism.

2. The large cylindrical base casting manufacturing device based on furan resin sand process according to claim 1, characterized in that: The connecting mechanism includes an abutment plate (18) and a connecting plate (19), with the lower side of the abutment plate (18) and the upper side of the connecting plate (19) hinged together. The upper side of the abutment plate (18) is rotatably connected to the upper side of the inner wall of the protective cover (17), and the lower side of the connecting plate (19) is rotatably connected to the fixing frame (20).

3. The large cylindrical base casting manufacturing device based on furan resin sand process according to claim 2, characterized in that: A sealing plate (22) is fixedly connected to the lower end of several airflow nozzles (21). The upper surface of the sealing plate (22) is in close contact with the lower surface of the protective cover (17). The position of the abutment plate (18) is opposite to the position of the corresponding valve plate (10). A rubber membrane (25) is provided between the abutment plate (18) and the valve plate (10). The periphery of the rubber membrane (25) is fixedly connected to the protective cover (17).

4. The large cylindrical base casting manufacturing device based on furan resin sand process according to claim 2, characterized in that: The bottom wall of the first protective cover (17) is fixedly connected to the second limiting rod (23). The outer surface of the second limiting rod (23) is slidably connected to the fixed frame (20). A second spring (24) is provided between the lower surface of the fixed frame (20) and the bottom wall of the first protective cover (17), and the second spring (24) is sleeved on the outside of the second limiting rod (23).

5. The large cylindrical base casting manufacturing device based on furan resin sand process according to claim 1, characterized in that: One end of the limiting rod (11) located inside the second cut-off seat (402) is provided with a spring (12) between it and the inner wall of the second cut-off seat (402). The inner wall of the second cut-off seat (402) is fixedly connected to a second guard (26), and the spring (12) is located inside the second guard (26). The return mechanism includes an extension tube (4021) and a return tube (16), and the return tube (16) is fixedly connected to the outer surface of the extension tube (4021). The outer surface of the baffle (15) is inserted and pulled into the extension tube (4021).

6. The large cylindrical base casting manufacturing device based on furan resin sand process according to claim 1, characterized in that: Limiting rods (29) are fixedly connected to both of the first and second cut-off seats (401) and the two second cut-off seats (402), and the outer surfaces of the four limiting rods (29) are slidably connected to the corresponding valve plates (10).

7. The large cylindrical base casting manufacturing device based on furan resin sand process according to claim 1, characterized in that: An isolation cover (27) is fixedly connected at the included angle between the second cut-off seat (402) and the return pipe (16). The wedge (14) is located inside the isolation cover (27). A guide rod is provided inside the isolation cover (27), and the wedge (14) is slidably connected to the outer surface of the guide rod.

8. The large cylindrical base casting manufacturing device based on furan resin sand process according to claim 1, characterized in that: The outer surfaces of the two fixed plates (5) are fixedly connected with isolation covers (28), and the two rotating rods (8) and the moving frame (9) are respectively located inside the corresponding isolation covers (28).

9. The large cylindrical base casting manufacturing apparatus based on furan resin sand process according to claim 5, characterized in that: The position of the limiting rod (11) is opposite to the position of the corresponding valve plate (10), and a rubber membrane (30) is provided between the limiting rod (11) and the valve plate (10). The rubber membrane (30) is fixedly connected to the protective cover (26) around its perimeter. A motor (6) is fixedly connected to the lower surface of the fixed plate (5) located in the lower layer. The output end of the motor (6) is fixedly connected to the flexible shaft (7). A guide groove (901) is provided on the inner side of the moving frame (9), and the pin head (801) is located inside the guide groove (901).

10. A method for manufacturing large cylindrical base castings based on furan resin sand process, characterized in that, Includes the following steps: S1. The mechanical arm (1) drives the sandblasting head (2) to move, and the first output pipe (4) of the two output pipes (4) supplies new sand to the sandblasting head (2) to spray and shape the outer layer of the large cylindrical base. S2. When it is necessary to switch to old sand to manufacture the inner layer of the cylindrical base, start the motor (6) to drive the flexible shaft (7) to rotate. The rotating rods (8) at both ends of the flexible shaft (7) drive the two moving frames (9) to move simultaneously through the pin head (801). S3. The two moving frames (9) push the valve plates (10) on the first output pipe (4) corresponding to the first cut-off seat (401) and the second cut-off seat (402) to move in the closing direction, cutting off the supply of new sand. At the same time, the two moving frames (9) pull the valve plates (10) on the second output pipe (4) corresponding to the first cut-off seat (401) and the second cut-off seat (402) to move in the opening direction, so that the old sand enters the sandblasting head (2) through the second output pipe (4) and begins to manufacture the inner layer of the cylindrical base. S4. The valve plate (10) inside the first output pipe (4) (401) squeezes the rubber membrane (25), and pushes the fixing frame (20) down through the abutment plate (18) and the connecting plate (19), so that several airflow nozzles (21) extend out of the protective cover (17) and continuously spray high-pressure airflow into the first output pipe (4); S5. While the valve plate (10) inside the first outlet pipe (4) is closed, the valve plate (10) inside the second outlet pipe (4) is squeezed by the second rubber diaphragm (30) and pushes the first limit rod (11). The first limit rod (11) slides along the wedge (14) through the slider (13), causing the baffle (15) to be pulled out from the extension pipe (4021), so that the return pipe (16) is open. The high-pressure airflow blows the residual new sand in the first outlet pipe (4) back to the transfer box or recycling box through the return pipe (16) to prevent the residual new sand from solidifying in the pipe. S6. When the inner layer of the cylindrical base is manufactured and it is necessary to switch back to new sand, the motor (6) reverses and drives the flexible shaft (7) to rotate in the opposite direction, and the two moving frames (9) move in the opposite direction to reset. S7. The two moving frames (9) pull the valve plates (10) on the first output pipe (4) corresponding to the first cut-off seat (401) and the second cut-off seat (402) to move in the opening direction to restore the supply of new sand. At the same time, the two moving frames (9) push the valve plates (10) on the second output pipe (4) corresponding to the second cut-off seat (401) and the second cut-off seat (402) to move in the closing direction to cut off the supply of old sand. S8. When the valve plate (10) inside the first stop (401) is opened, the valve plate (10) is released from the pressure on the first rubber diaphragm (25), and the second spring (24) pushes the fixing frame (20) to move up and reset, so that the airflow nozzle (21) retracts into the first protective cover (17) and stops blowing air. S9. At the same time, the valve plate (10) inside the second cut-off seat (402) in the first output pipe (4) is released from the pressure on the second rubber diaphragm (30). The spring (12) pushes the limit rod (11) to reset. The limit rod (11) drives the wedge (14) and the baffle (15) to move in the opposite direction through the slider (13), so that the baffle (15) is reinserted into the extension pipe (4021) to close the return pipe (16). The new sand is normally supplied to the sandblasting head (2) through the first output pipe (4) to continue manufacturing the outer layer of the cylindrical base.

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