A continuous drying machine for lost foam coating

Abstract

This invention relates to the field of lost foam casting, specifically a continuous dryer for lost foam casting coatings. It includes a base, a turntable mounted on the base, and multiple material seats on the upper surface of the turntable. A main pipe is positioned in the center of the turntable, with its outer ring rotatably connected to the inner ring of the turntable. Multiple branch pipes are mounted on the main pipe, with multiple branch pipes also mounted on the outer ring of the upper end of the main pipe. Each branch pipe is connected to the main pipe, and a cover plate is fixed to the upper end of the main pipe. The cover plate is arc-shaped and inverted above the turntable, forming a drying channel with the turntable. During operation, after the lost foam casting is coated with slurry, it can be placed directly on the material seats, eliminating the need to place it on a material rack, thus improving work efficiency. Simultaneously, the exposure time and drying time of each coated lost foam casting tend to be similar, ensuring the quality of each lost foam casting product. Furthermore, the connection to the continuously rotating turntable achieves continuous drying of the lost foam casting coating, further enhancing production efficiency.

Description

Technical Field

[0001] This invention relates to the field of lost foam casting, specifically a continuous drying machine for lost foam casting coatings. Background Technology

[0002] In the lost foam casting process, a refractory coating is applied to the surface to form an isolation layer between the molten metal and the molding sand, preventing the molten metal from seeping into the gaps between the sand particles and avoiding mechanical and thermochemical sand adhesion. At the same time, after the coating dries, it forms a hard shell layer on the lost foam, which significantly improves the strength and rigidity of the foam model, reduces deformation during embedding, and improves the dimensional accuracy of the casting.

[0003] Coating drying methods can be divided into two main categories: natural drying and heated drying. The specific choice depends on the coating system, production batch, sample size, and coating quality requirements. Natural drying utilizes sunlight to dry the coating, requires less equipment, has lower costs, and is suitable for single pieces, small batches, or alcohol-based fast-drying coatings. However, natural drying takes a long time and is less efficient.

[0004] Heat drying is generally carried out using heating equipment. Current heating equipment, due to its structural design and operation, typically involves placing the coated lost foam pieces on a rack after they have been dipped in the coating. Once the rack is full, the lost foam pieces, along with the rack, are pushed into the drying equipment. After drying, they are then moved to a drying area. Since the drying equipment can hold a large number of lost foam pieces, and the coating process is done one by one, the drying process only begins after the rack is full. This process affects work efficiency. Furthermore, the moisture content of the coating on the surface of the first and last coated lost foam pieces on the rack differs significantly, even though the drying time is the same, inevitably affecting the drying quality of the lost foam coating.

[0005] Therefore, a continuous drying machine for lost foam coatings is proposed to address the above problems. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a lost foam coating continuous dryer of the present invention includes a base, a ring-shaped turntable is set on the base, a plurality of material seats are set on the upper surface of the turntable, and lost foam coated with refractory coating is placed on the material seats.

[0008] The main pipe is located in the middle of the turntable. The outer ring of the main pipe is rotatably connected to the inner ring of the turntable. Multiple branch pipes are set on the main pipe. Multiple branch pipes are set on the upper outer ring of the main pipe. Each branch pipe is connected to the main pipe. A cover plate is fixed to the upper end of the main pipe. The cover plate is arc-shaped and is upside down above the turntable. The cover plate and the turntable form a drying channel.

[0009] Preferably, each of the material seats includes a gear rotatably connected to the turntable, the upper end face of which is used to place the lost foam casting.

[0010] The outer ring of the turntable is provided with an arc-shaped rack, which is arranged along the drying channel. The rack meshes with the gear and rotates the gear.

[0011] Preferably, the outer ring of the main pipe has multiple air outlets, the inner ring of the turntable has a hollow ring body, the inner ring of the ring body is rotatably connected to the main pipe, and the inner ring of the ring body has multiple air inlets.

[0012] Multiple branch pipes are arranged in a circular array below the turntable. One end of each branch pipe is connected to the ring body, and the other end of each branch pipe passes upward through the turntable and gear. The other end of each branch pipe is connected to a honeycomb block. Gas is injected into the honeycomb block from the branch pipe and dispersed inside the lost foam.

[0013] Preferably, each of the cellular blocks includes an end, a circular plate, and a connector;

[0014] Each of the aforementioned ends is arranged in a honeycomb pattern, and a circular plate is fixed to the lower end of each end. A cross-shaped insertion groove is opened on the lower surface of the circular plate, and the top of the insertion groove communicates with the interior of the end.

[0015] Each of the aforementioned connectors is fixedly connected to the other end of the branch pipe, and a gas release assembly is provided between the connector and the other end of the branch pipe. The gas release assembly includes a vertical pipe, which is disposed in a sliding hole opened at the center of the connector. The outer ring of the vertical pipe is connected to the sliding hole by a spring. An air inlet is opened on the lower outer ring of the vertical pipe, and a hollow block is provided on the lower outer ring of the vertical pipe. An exhaust port is opened on the inner ring of the hollow block, and the lower end of the hollow block is connected to the other end of the branch pipe.

[0016] Preferably, each of the branch pipes is provided with a control valve, and each control valve includes a base shell. The top of each base shell is fixed to the lower surface of the turntable. Each base shell has a telescopic hole at its bottom. Each telescopic hole is provided with a spring-connected slide rod. Each slide rod has a radial through hole on its outer ring. The through hole connects to the airflow channels opened on both sides inside the base shell. The airflow channels connect to the branch pipe.

[0017] A ring-shaped support plate is provided below the base shell. The support plate is coaxially fixed together with the main pipe. Multiple top plates are provided above the support plate. The lower surface of the top plate is rotatably connected with a set screw, which is threaded onto the support plate.

[0018] Preferably, an oil replenishing lubrication component is provided on one side of the upper end of the main pipe. The oil replenishing lubrication component is used to replenish oil for the relative rotation between the gear and the turntable. The oil replenishing lubrication component includes an oil inlet pipe provided on one side of the inner wall of the main pipe. The end of the oil inlet pipe extends upward to the upper end of the main pipe. An oil box is provided at the end of the oil inlet pipe. An oil outlet pipe is connected inside the oil box. The end of the oil outlet pipe extends to one side of the gear.

[0019] Preferably, a cover plate is provided at the end of the oil inlet pipe, a hole is provided at an eccentric position on the cover plate, a rotating shaft is provided at the center position of the cover plate, the rotating shaft passes through the bottom of the oil box, and a torsion spring is sleeved on the rotating shaft, one end of the torsion spring is fixed to the rotating shaft, and the other end of the torsion spring is fixed to the bottom of the oil box.

[0020] The upper surface of the turntable is provided with multiple stop bars, each of which is located on one side of the gear. The stop bars are used to block the oil outlet pipe and to make the oil box rotate around the axis of the rotating shaft.

[0021] A second hole is made at an eccentric position at the bottom of the oil box. When the oil box is rotated, the second hole connects with the first hole.

[0022] Preferably, a ball is rotatably connected to the lower end of each of the slide bars.

[0023] Preferably, the cover plate is provided with a flow guiding component, which is used to guide the airflow at the inlet of the drying channel to the outlet of the drying channel, and the flow guiding component includes a plurality of flow guiding pipes arranged above the cover plate, and an air pump is provided on the flow guiding pipes.

[0024] Preferably, the slot is flared.

[0025] The advantages of this invention are:

[0026] 1. In this invention, when the lost foam coating continuous dryer is in operation, after the lost foam is coated with slurry, it can be placed directly on the material seat without having to be placed on the material rack, thus improving work efficiency. At the same time, the exposure time and drying time of each coated lost foam in the air tend to be the same, which can ensure the production quality of each lost foam coating. Furthermore, the continuously rotating turntable achieves the purpose of continuous drying of lost foam coating, which helps to improve production efficiency.

[0027] 2. In this invention, the dry hot gas inside the main pipe enters the ring body through the air outlet and air inlet, and then exits through multiple branch pipes into the honeycomb block. The lost foam sits on the gear, and the honeycomb block is placed on the inner surface of the lost foam. The dry hot gas is dispersed and blown inside the lost foam, that is, on the inner surface of the lost foam, the coating at that position is dried, ensuring that every part of the outer surface of the lost foam can come into contact with the dry hot gas and be fully dried. Attached Figure Description

[0028] Figure 1This is a first-view perspective perspective view of the lost foam coating continuous dryer of the present invention;

[0029] Figure 2 This is a second-view perspective perspective view of the continuous drying machine for lost foam coating in this invention;

[0030] Figure 3 This is a top view of the continuous drying machine for lost foam coating in this invention;

[0031] Figure 4 This is a perspective view of the fit between the cover plate and the turntable in this invention;

[0032] Figure 5 This is a perspective view of the cooperation between the main pipe and the turntable in this invention;

[0033] Figure 6 This is a perspective view of the cover plate in this invention;

[0034] Figure 7 This is a perspective view of the turntable in this invention;

[0035] Figure 8 This is a perspective view of the interaction between the turntable and the material holder in this invention;

[0036] Figure 9 This is a perspective view of the end portion in this invention;

[0037] Figure 10 This is a perspective view of the honeycomb block in this invention;

[0038] Figure 11 This is a perspective view of the oil replenishment and lubrication assembly in this invention;

[0039] Figure 12 This is a perspective view of the oil box in this invention;

[0040] Figure 13 This is a cross-sectional view of the connector in this invention;

[0041] Figure 14 This is a cross-sectional view of the base shell in this invention.

[0042] In the diagram: 1. Base; 2. Turntable; 3. Lost foam casting; 4. Material holder; 5. Main pipe; 6. Branch pipe; 7. Cover plate; 8. Drying channel; 9. Gear ring; 10. Gear; 11. Rack; 12. Air outlet; 13. Ring body; 14. Air inlet; 15. Branch pipe; 16. Honeycomb block; 17. End; 18. Round plate; 19. Socket; 20. Socket groove; 21. Sliding hole; 22. Air inlet; 23. Hollow block 24. Exhaust port; 25. Base shell; 26. Telescopic hole; 27. Slide rod; 28. Through hole; 29. ​​Airflow channel; 30. Support plate; 31. Top plate; 32. Top screw; 33. Oil inlet pipe; 34. Oil box; 35. Oil outlet pipe; 36. Cover plate; 37. Hole No. 1; 38. Rotating shaft; 39. Torsion spring; 40. Stop bar; 41. Hole No. 2; 42. Ball; 43. Drain pipe; 44. Inlet end; 45. Outlet end. Detailed Implementation

[0043] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0044] Reference Figure 1 - Figure 8 A continuous drying machine for lost foam coating includes a base 1, a ring-shaped turntable 2 on the base 1, a plurality of material seats 4 on the upper surface of the turntable 2, and lost foam 3 with refractory coating on the surface placed on the material seats 4.

[0045] The main pipe 5 is located in the middle of the turntable 2. The outer ring of the main pipe 5 is rotatably connected to the inner ring of the turntable 2. Multiple branch pipes 6 are set on the main pipe 5. Multiple branch pipes 6 are set on the upper outer ring of the main pipe 5. Each branch pipe 6 is connected to the main pipe 5. A cover plate 7 is fixed to the upper end of the main pipe 5. The cover plate 7 is arc-shaped and is upside down above the turntable 2. The cover plate 7 and the turntable 2 form a drying channel 8.

[0046] In this embodiment, a drive component is provided on the outer ring of the turntable 2, which can drive it to rotate slowly. The specific drive component may consist of a geared motor, a driving tooth and a toothed ring 9. The output end of the geared motor is fixedly connected to the driven tooth, and the lower surface of the turntable 2 is fixedly connected to the toothed ring 9, which meshes with the driven tooth.

[0047] The main pipe 5 is connected to an external heating device, which injects dry hot gas into the main pipe 5 and then into the drying channel 8 through multiple branch pipes 6. The specific working process of this lost foam coating continuous dryer is as follows:

[0048] like Figure 3As shown in the top view of the continuous drying machine for lost foam coating, the position corresponding to the cover plate 7 is the drying zone. The left port of the cover plate 7 is the inlet end 44, and the right port of the cover plate 7 is the outlet end 45. The remaining parts of the turntable 2 are the unloading zone and the loading zone, with the unloading zone closer to the outlet end 45 and the loading zone closer to the inlet end 44. In the loading zone, lost foam 3 is placed one by one on the material seat 4. The slowly rotating turntable 2 facilitates the placement and removal of lost foam 3 and ensures that the lost foam 3 is fully dried in the drying channel 8. The lost foam 3 rotates with the turntable 2 into the drying channel 8, where a continuous supply of hot dry gas is injected. The hot dry gas then dries the coating on the surface of the lost foam 3. After drying, the lost foam 3 is unloaded. After the lost foam 3 rotates slowly with the turntable 2 to the unloading zone, it is removed from the material seat 4. When the material seat 4 rotates to the loading zone, a new lost foam 3 is placed and loaded.

[0049] When the lost foam coating continuous dryer is in operation, after the lost foam 3 is coated with slurry, it can be placed directly on the material seat 4 without having to be placed on the material rack, which improves work efficiency. At the same time, the exposure time and drying time of each coated lost foam 3 to air are similar, which can ensure the production quality of each lost foam coating. Furthermore, the continuously rotating turntable 2 achieves the purpose of continuous drying of the lost foam 3 coating, which helps to improve production efficiency.

[0050] Reference Figure 1 - Figure 8 Each of the material seats 4 includes a gear 10 rotatably connected to the turntable 2, and the upper end face of the gear 10 is used to place the lost foam 3;

[0051] The outer ring of the turntable 2 is provided with an arc-shaped rack 11. The rack 11 is arranged along the drying channel 8. The rack 11 meshes with the gear 10 and rotates the gear 10.

[0052] Considering the uniformity of contact between the coating on each surface of the lost foam 3 and the hot dry gas, the drying quality of the coating on the surface of the lost foam 3 can be improved. In addition, a structure that can drive the lost foam 3 to rotate is set up. Specifically, when the material seat 4 is located in the feeding area, the lost foam 3 is placed on the gear 10. When the gear 10 moves into the drying channel 8 with rotation, the gear 10 meshes with the rack 11. The rack 11 rubs the gear 10 to rotate, and at the same time the lost foam 3 also rotates. At this time, the lost foam 3 moves along the inside of the drying channel 8 while rotating, so that every part of the surface of the lost foam 3 can come into contact with the hot dry gas, further improving the drying quality.

[0053] Reference Figure 1 - Figure 10The outer ring of the main pipe 5 has multiple air outlets 12, and the inner ring of the turntable 2 has a hollow ring 13. The inner ring of the ring 13 is rotatably connected to the main pipe 5, and the inner ring of the ring 13 has multiple air inlets 14.

[0054] Multiple branch pipes 15 are arranged in a circular array below the turntable 2. One end of each branch pipe 15 is connected to the ring body 13, and the other end of each branch pipe 15 passes upward through the turntable 2 and the gear 10. The other end of each branch pipe 15 is connected to a honeycomb block 16. Gas is injected into the honeycomb block 16 from the branch pipe 15 and dispersed inside the lost foam 3.

[0055] Castings come in various shapes, and correspondingly, lost foam castings 3 also come in various shapes. Some cylindrical lost foam castings 3 with inner surfaces require consideration of drying the inner surface during drying to ensure the consistency of the coating drying on the surface of the lost foam casting 3. In this embodiment, some dry hot gas inside the main pipe 5 enters the ring body 13 through the air outlet 12 and the air inlet 14, and then exits along multiple branch pipes 15 into the honeycomb block 16. The lost foam casting 3 sits on the gear 10, and the honeycomb block 16 is placed on the inner surface of the lost foam casting 3. The dry hot gas will be dispersed and blown inside the lost foam casting 3, that is, on the inner surface of the lost foam casting 3, the coating at that position is dried, ensuring that every part of the outer surface of the lost foam casting 3 can contact the dry hot gas and be fully dried.

[0056] Reference Figure 1 - Figure 10 ,as well as Figure 13 Each of the cellular blocks 16 includes an end 17, a circular plate 18, and a connector 19;

[0057] Each of the aforementioned end 17 is arranged in a honeycomb pattern, and a circular plate 18 is fixed to the lower end of each end 17. A cross-shaped insertion groove 20 is opened on the lower surface of the circular plate 18, and the top of the insertion groove 20 communicates with the interior of the end 17.

[0058] Each of the aforementioned plug-in 19 is fixedly connected to the other end of the branch pipe 15, and a gas release assembly is provided between the plug-in 19 and the other end of the branch pipe 15. The gas release assembly includes a vertical pipe 46, which is disposed in a sliding hole 21 opened at the center of the plug-in 19. The outer ring of the vertical pipe 46 is connected to the sliding hole 21 by a spring. An air inlet 22 is opened on the lower outer ring of the vertical pipe 46. A hollow block 23 is provided on the lower outer ring of the vertical pipe 46. An exhaust port 24 is opened on the inner ring of the hollow block 23. The lower end of the hollow block 23 is connected to the other end of the branch pipe 15.

[0059] The pre-coated lost foam 3 can be placed on the circular plate 18. Then, the circular plate 18 and the lost foam 3 are placed together on the gear 10. Specifically, the circular plate 18 sits on the upper surface of the gear 10, and the insertion seat 19 is inserted into the insertion groove 20. At the same time, the top of the insertion groove 20 presses down the vertical pipe 46, and the vertical pipe 46 moves down. At this time, the air inlet 22 at the lower end of the vertical pipe 46 is connected to the exhaust port 24 of the hollow block 23, and the hollow block 23 is connected to the branch pipe 15. Therefore, the dry hot gas flows along the branch pipe 15, the hollow block 23 and the vertical pipe 46 in sequence, and finally enters the insertion groove 20. The top of the insertion groove 20 is connected to the inside of the end 17. The dry hot gas is injected into the end 17 and dispersed and discharged, dispersed inside the lost foam 3, and dries the coating on the inner surface of the lost foam 3.

[0060] When the honeycomb block 16 is not placed on the gear 10, the vertical tube 46 moves upward under the elastic force of the spring connected to it, and the lower end of the vertical tube 46 is disconnected from the hollow block 23. The dry hot gas will not be discharged from the branch pipe 15. When it is in the unloading area, the dried lost foam 3 is taken upward. At this time, the dry hot gas in the branch pipe 15 stops flowing. At the same time, in the loading area, when the operator loads each lost foam 3, no dry hot gas flows out of the branch pipe 15 located in the loading area, which can provide a good loading and unloading environment for the operator and avoid the dry hot gas from causing harm to the human body.

[0061] Reference Figure 1 - Figure 6 ,as well as Figure 14 Each of the branch pipes 15 is provided with a control valve, and each control valve includes a base shell 25. The top of each base shell 25 is fixed to the lower surface of the turntable 2. Each base shell 25 has a telescopic hole 26 at its bottom. Each telescopic hole 26 is provided with a spring-connected slide rod 27. Each slide rod 27 has a radial through hole 28 on its outer ring. The through hole 28 connects to the airflow channels 29 opened on both sides inside the base shell 25. The airflow channels 29 connect to the branch pipe 15.

[0062] A ring-shaped support plate 30 is provided below the base shell 25. The support plate 30 is coaxially fixed together with the main pipe 5. Multiple top plates 31 are provided above the support plate 30. The lower surface of the top plate 31 is rotatably connected with a set screw 32, which is threaded onto the support plate 30.

[0063] Each branch pipe 15 is equipped with a structure that can control the flow rate of dry hot gas. Specifically, the rotating set screw 32 pushes the top plate 31 or lowers the top plate 31. When the base block rotates with the turntable 2 onto the top plate 31, the lower end of the slide rod 27 pushes against the top plate 31. At the same time, the top plate 31 pushes the slide rod 27. The through hole 28 on the slide rod 27 coincides with the airflow channel 29, or the overlapping surface is increased to increase the flow rate of dry hot gas in the branch pipe 15. When the internal surface area of ​​the lost mold 3 is large, the flow rate of dry hot gas in the branch pipe 15 can be increased by increasing the overlapping surface, so that more dry hot gas comes into contact with the internal surface of the lost mold, ensuring the drying quality and providing high flexibility.

[0064] Furthermore, the up-and-down movement of the slide rod 27 can also cut off the branch pipe 15. At the loading and unloading area, the slide rod 27 loses the pressure of the top plate 31, the slide rod 27 moves down, and the outer surface of the slide rod 27 blocks the airflow channel 29, cutting off the flow of dry and hot gas in the branch pipe 15 and preventing dry and hot gas from causing harm to the human body.

[0065] In this embodiment, multiple top plates 31 are set, each top plate 31 is placed at a different position below the drying channel 8. By adjusting the top plates 31 to different heights, different flow rates of dry hot gas can be achieved in each branch pipe 15. For the lost foam 3 that is about to reach the outlet end 45, the flow rate of dry hot gas can be reduced, so that the lost foam 3 descends stably and slowly, improving the quality of coating drying and avoiding the problem of sudden changes in coating stability and cracking.

[0066] Reference Figure 1 - Figure 6 ,as well as Figure 11 and Figure 12 An oil replenishing lubrication assembly is provided on one side of the upper end of the main pipe 5. The oil replenishing lubrication assembly is used to replenish oil for the relative rotation between the gear 10 and the turntable 2. The oil replenishing lubrication assembly includes an oil inlet pipe 33 provided on one side of the inner wall of the main pipe 5. The end of the oil inlet pipe 33 extends upward to the upper end of the main pipe 5. An oil box 34 is provided at the end of the oil inlet pipe 33. An oil outlet pipe 35 is connected inside the oil box 34. The end of the oil outlet pipe 35 extends to one side of the gear 10.

[0067] The drying channel 8 is in a hot and dry environment, which increases the wear between the rotating gear 10 and the turntable 2. The hot and dry environment also accelerates the evaporation of the lubricating oil at the connection point between the gear 10 and the turntable 2. To address this, an oil replenishment lubrication assembly is provided. Specifically, an external oil pump is connected to the oil inlet pipe 33, which is connected to the oil outlet pipe 35 through the oil box 34. The oil outlet pipe 35 extends to the position of the gear 10, and the lubricating oil drips onto the upper surface of the turntable 2. Then, as the gear 10 rotates, the lubricating oil is spread and applied to the connection point between the gear 10 and the turntable 2, achieving a lubrication and protection function.

[0068] Reference Figure 11 and Figure 12 The end of the oil inlet pipe 33 is provided with a cover plate 36, and a hole 37 is provided at an eccentric position on the cover plate 36. A rotating shaft 38 is provided at the center position on the cover plate 36. The rotating shaft 38 passes through the bottom of the oil box 34, and a torsion spring 39 is sleeved on the rotating shaft 38. One end of the torsion spring 39 is fixed to the rotating shaft 38, and the other end of the torsion spring 39 is fixed to the bottom of the oil box 34.

[0069] The upper surface of the turntable 2 is provided with a plurality of stop bars 40, each of which is arranged on one side of the gear 10. The stop bars 40 are used to block the oil outlet pipe 35 and to make the oil box 34 rotate around the axis of the rotating shaft 38.

[0070] A second hole 41 is provided at the eccentric position at the bottom of the oil box 34. When the oil box 34 is rotated, the second hole 41 communicates with the first hole 37.

[0071] The oil outlet pipe 35 extends to the unloading area. The turntable 2 drives the baffle 40 to rotate. When the baffle 40 interferes with the end of the oil outlet pipe 35, the baffle 40 pushes the oil outlet pipe 35 and the oil box 34 to deflect around the rotating shaft 38. During the deflection process, the first hole 37 and the second hole 41 are connected. Then, the lubricating oil flows along the oil inlet pipe 33, the first hole 37, the second hole 41, the oil box 34 and the oil outlet pipe 35. The lubricating oil drips onto the upper surface of the turntable 2. When the oil outlet pipe 35 passes the baffle 40, the oil box 34 deflects and resets again under the torque of the torsion spring 39 connected to it. At this time, the second hole 41 and the first hole 37 are misaligned, and the first hole 37 is blocked by the bottom of the oil box 34, realizing the intermittent supply of lubricating oil. This saves lubricating oil and avoids continuous flow of lubricating oil, which would pollute the drying environment.

[0072] Reference Figure 14 Each of the slide rods 27 has a ball 42 rotatably connected to its lower end; the ball 42 is used to convert the sliding friction between the slide rod 27 and the top plate 31 into the sliding friction between the ball 42 and the top plate 31, so that the slide rod 27 can move upward smoothly and improve its movement stability.

[0073] Reference Figure 1 - Figure 6 The cover plate 7 is provided with a flow guiding component, which is used to guide the airflow at the inlet of the drying channel 8 to the outlet of the drying channel 8. The flow guiding component includes a plurality of flow guiding pipes 43 arranged above the cover plate 7, and an air pump is provided on the flow guiding pipes 43.

[0074] The set flow-guiding component is used to make full use of the heat source and introduce excess gas from the inner top plate 31 of the inlet end 44 to the outlet end 45 position. This keeps the lost foam 3 that has moved to the outlet end 45 position warm, allowing it to cool down slowly. By gradually cooling down, the internal stress of the coating can be relieved, cracking can be avoided, and the coating quality can be improved.

[0075] Reference Figure 10 The slot 20 is flared; when the end 17 is placed on the plug seat 19, the flared slot 20 can increase the installation fit between the plug seat 19 and the slot 20, that is, increase the possibility of the end 17 being placed on the plug seat 19 in one go, which makes it convenient for the operator to load the lost foam 3.

[0076] Working principle:

[0077] Step 1: Loading materials, such as Figure 3 As shown in the top view of the continuous drying machine for lost foam coating, the position corresponding to the cover plate 7 is the drying zone, the left port of the cover plate 7 is the inlet end 44, the right port of the cover plate 7 is the outlet end 45, and the remaining parts of the turntable 2 are the unloading zone and the loading zone, with the unloading zone close to the outlet end 45 and the loading zone close to the inlet end 44. After the lost foam 3 is coated with slurry, it is placed directly on the material seat 4. The slowly rotating turntable 2 facilitates the placement and removal of the lost foam 3 and ensures that the lost foam 3 is fully dried in the drying channel 8.

[0078] Step 2: Drying. The lost foam 3 rotates with the turntable 2 into the drying channel 8. A continuous stream of hot dry gas is injected into the drying channel 8, and then the hot dry gas dries the coating on the surface of the lost foam 3.

[0079] Step 3: Unloading. After the lost mold 3 slowly rotates with the turntable 2 to the unloading area, remove the lost mold 3 from the material seat 4. When the material seat 4 rotates to the loading area, place the new lost mold 3 for loading.

[0080] Simply repeat steps one, two, and three thereafter.

[0081] 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 present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A continuous drying machine for lost foam coating, characterized in that: Includes a base, on which a ring-shaped turntable is set, and multiple material seats are set on the upper surface of the turntable, on which lost foam coated with refractory paint is placed; The main pipe is located in the middle of the turntable. The outer ring of the main pipe is rotatably connected to the inner ring of the turntable. Multiple branch pipes are set on the upper outer ring of the main pipe. Each branch pipe is connected to the main pipe. A cover plate is fixed to the upper end of the main pipe. The cover plate is arc-shaped and is upside down above the turntable. The cover plate and the turntable form a drying channel. Each of the material holders includes a gear rotatably connected to a turntable, the upper end face of which is used to hold the lost foam casting. The outer ring of the turntable is provided with an arc-shaped rack, which is arranged along the drying channel. The rack meshes with the gear and rotates the gear. The outer ring of the main pipe has multiple air outlets, and the inner ring of the turntable has a hollow ring body. The inner ring of the ring body is rotatably connected to the main pipe, and the inner ring of the ring body has multiple air inlets. Multiple branch pipes are arranged in a circular array below the turntable. One end of each branch pipe is connected to the ring body, and the other end of each branch pipe passes upward through the turntable and gear. The other end of each branch pipe is connected to a honeycomb block. Gas is injected into the honeycomb block from the branch pipe and dispersed inside the lost foam. Each of the aforementioned cellular blocks includes an end cap, a circular plate, and a connector; Each of the aforementioned ends is arranged in a honeycomb pattern, and a circular plate is fixed to the lower end of each end. A cross-shaped insertion groove is opened on the lower surface of the circular plate, and the top of the insertion groove communicates with the interior of the end. Each of the aforementioned plug-in sockets is fixedly connected to the other end of the branch pipe, and a gas release assembly is provided between the plug-in socket and the other end of the branch pipe. The gas release assembly includes a vertical pipe, which is disposed in a sliding hole opened at the center of the plug-in socket. The outer ring of the vertical pipe is connected to the sliding hole by a spring. An air inlet is opened on the lower outer ring of the vertical pipe. A hollow block is provided on the lower outer ring of the vertical pipe. An exhaust port is opened on the inner ring of the hollow block. The lower end of the hollow block is connected to the other end of the branch pipe. Each of the branch pipes is equipped with a control valve, and each control valve includes a base shell. The top of each base shell is fixed to the lower surface of the turntable. Each base shell has a telescopic hole at its bottom. Each telescopic hole is equipped with a spring-connected slide rod. Each slide rod has a radial through hole on its outer ring. The through hole connects to the airflow channels on both sides inside the base shell. The airflow channels connect to the branch pipe. A ring-shaped support plate is provided below the base shell. The support plate is coaxially fixed together with the main pipe. Multiple top plates are provided above the support plate. The lower surface of the top plate is rotatably connected with a set screw, which is threaded onto the support plate.

2. The continuous drying machine for lost foam coating according to claim 1, characterized in that: An oil replenishment lubrication assembly is provided on one side of the upper end of the main pipe. The oil replenishment lubrication assembly is used to replenish oil for the relative rotation between the gear and the turntable. The oil replenishment lubrication assembly includes an oil inlet pipe provided on one side of the inner wall of the main pipe. The end of the oil inlet pipe extends upward to the upper end of the main pipe. An oil box is provided at the end of the oil inlet pipe. An oil outlet pipe is connected inside the oil box. The end of the oil outlet pipe extends to one side of the gear.

3. A continuous drying machine for lost foam coating according to claim 2, characterized in that: The end of the oil inlet pipe is provided with a cover plate, a hole No. 1 is provided on the cover plate at an eccentric position, and a rotating shaft is provided at the center of the cover plate. The rotating shaft passes through the bottom of the oil box, and a torsion spring is sleeved on the rotating shaft. One end of the torsion spring is fixed to the rotating shaft, and the other end of the torsion spring is fixed to the bottom of the oil box. The upper surface of the turntable is provided with multiple stop bars, each of which is located on one side of the gear. The stop bars are used to block the oil outlet pipe and to make the oil box rotate around the axis of the rotating shaft. A second hole is made at an eccentric position at the bottom of the oil box. When the oil box is rotated, the second hole connects with the first hole.

4. A continuous drying machine for lost foam coating according to claim 3, characterized in that: Each of the slide bars has a ball rotatably connected to its lower end.

5. A continuous drying machine for lost foam coating according to claim 1, characterized in that: The cover plate is provided with a flow guiding component, which is used to guide the airflow at the inlet of the drying channel to the outlet of the drying channel. The flow guiding component includes multiple flow guiding pipes arranged above the cover plate, and an air pump is provided on the flow guiding pipes.

6. A continuous drying machine for lost foam coating according to claim 1, characterized in that: The slot of the plug is flared.

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