An apparatus for manufacturing a precision cast shell of silica sol process

Abstract

This invention belongs to the field of investment casting technology, specifically a manufacturing equipment for precision casting of mold shells using silica sol process. It includes a mold shell processing component and a mold shell coating component. The coating component includes a support base with an elastic bladder connected to it. A coating layer is applied to the outer surface of the elastic bladder. An air inlet pipe and an air outlet pipe, communicating with the elastic bladder, are connected to the support base. The air inlet end of the air inlet pipe is connected to an external air pump. Control valves are respectively installed on the air inlet and outlet pipes. This invention can form a reinforcing agent coating film on the inner wall of the already processed mold shell, further improving the forming quality of the inner wall, increasing the strength and permeability of the mold shell, making the casting easier to remove from the shell. Furthermore, the mold shell coating component can automatically complete the coating work on the inner wall of the mold shell, saving time and labor. Simultaneously, this mold shell coating component can process mold shells of different shapes and models, improving the applicability of the equipment.

Description

Technical Field

[0001] This invention belongs to the field of investment casting technology, specifically a manufacturing equipment for precision casting shells using silica sol process. Background Technology

[0002] With the development of industrial technology, the manufacturing industry has placed higher demands on the use of precision castings, resulting in increasingly complex product structures. Investment casting is characterized by its ability to produce castings with complex shapes and internal cavities containing deep holes and narrow grooves. Some complex shells are generally difficult to remove after casting, requiring repeated acid soaking and shot blasting. Furthermore, many castings are large, with numerous layers in their shells. This difficulty in sand removal increases: firstly, the workload of cleaning; secondly, the production cycle; and thirdly, the overall cost of casting cleaning, including labor time, materials, and equipment power. Therefore, for castings with many layers and heavy weight, the application of new materials to reduce the weight, thickness, permeability, and labor intensity of the shell is of great significance.

[0003] In the prior art, when the reinforcing agent is mixed with the shell material and processed into a shell, the reinforcing agent content in the inner wall of the shell is relatively low due to the uneven mixing of the reinforcing agent and the shell material, which affects the strength and air permeability of the inner wall of the shell.

[0004] Therefore, the present invention provides a manufacturing equipment for precision casting of shells using a silica sol process. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: A manufacturing equipment for precision casting of shells using a silica sol process, comprising a shell processing assembly and a shell coating assembly, wherein the shell coating assembly includes a support base, an elastic bladder connected to the support base, and a plurality of groups of coating layers made of absorbent material on the outer surface of the elastic bladder. An air inlet pipe and an air outlet pipe, respectively connected to the interior of the elastic bladder, are connected to the support base. The air inlet end of the air inlet pipe is connected to an external air pump, and control valves are respectively provided on the air inlet pipe and the air outlet pipe. When the reinforcing agent and shell raw material are mixed and processed into a shell, due to the unevenness of the mixing of the reinforcing agent and the shell raw material, the reinforcing agent content on the inner wall of the formed shell is relatively low, thus affecting the strength and air permeability of the inner wall of the shell. This invention, by setting up a shell coating assembly, after the shell processing assembly has finished processing the shell, first places the elastic bladder in the reinforcing agent solution, so that the coating layer... The reinforcing agent is absorbed, and air is simultaneously pumped into the elastic bladder via an external air pump. This causes the elastic bladder to bulge, increasing the porosity of the coating layer and facilitating the absorption of the reinforcing agent. The elastic bladder is then deflated through an exhaust pipe and inserted into the mold opening. It is then re-inflated until it adheres to the inner wall of the mold. At this point, the reinforcing agent in the coating layer is evenly and thoroughly coated onto the inner wall of the mold under the pressure of the inner wall and the elastic bladder. This forms a reinforcing agent coating film on the already formed inner wall of the mold, further improving the forming quality of the inner wall, increasing the strength and permeability of the mold, and making the casting easier to demold. The mold coating assembly automatically completes the coating process on the inner wall of the mold, saving time and labor. Furthermore, this assembly can process molds of different shapes and models, improving the applicability of the equipment.

[0007] Preferably, the surface of the elastic bladder is connected to several first-order flexible magnetic layers, the coating layer is laid on the surface of the first-order flexible magnetic layers, and several second-order flexible magnetic layers that cooperate with the first-order flexible magnetic layers are connected to the outer surface of the coating layer. The second-order flexible magnetic layers can attract each other when they are close to the first-order flexible magnetic layers. The outer surface of the second-order flexible magnetic layers is provided with several protrusions, and several discharge grooves are opened on the surface of the second-order flexible magnetic layers. When the elastic bladder bulges, it can drive the protrusions on the second-order flexible magnetic layers to contact the inner wall of the shell. When the elastic bladder continues to bulge, it can drive the first-order flexible magnetic layers to squeeze the reinforcing agent in the coating layer from the discharge grooves to the inner wall of the shell. At the same time, as the two flexible magnetic layers approach each other, they can attract each other. When the elastic bladder shrinks and resets after completing the coating work, the two mutually attracted flexible magnetic layers can continue to squeeze and limit the coating layer, reducing the possibility that the coating layer will expand when the elastic bladder shrinks and reabsorb the reinforcing agent already coated on the surface of the shell.

[0008] Preferably, the surface of the elastic bladder is connected to several connecting rods, and the other end of each connecting rod is connected to a spherical block. The discharge trough is funnel-shaped and corresponds to the position of the spherical block. When the elastic bladder gradually expands, the connecting rods can press the spherical block out from the middle of the funnel-shaped discharge trough and seal the discharge trough. When the elastic bladder contracts and resets, the discharge trough's limiting effect on the spherical block allows the two flexible magnetic layers to more stably and firmly clamp and limit the coated block, reducing the possibility of the two flexible magnetic layers separating due to insufficient attraction.

[0009] Preferably, the support seat corresponding to the inside of the elastic bladder is provided with a bulge, the outer surface of the bulge is provided with several protrusions, the surface of the bulge is provided with an air outlet, the air outlet is provided with an air flow valve, the connecting rod and the inside of the spherical block are respectively provided with interconnected air guide grooves, and the side wall of the elastic bladder is provided with an air guide hole connected to the air guide groove; when the air inlet pipe is inflated, the air flow valve is closed, the inflated gas flows into the bulge first, and drives the elastic bladder to inflate synchronously through the bulge. When the coating layer is completed, the air flow valve is opened by controlling it, so that the gas in the bulge is ejected from the spherical block through the air guide hole and the air guide groove. At the same time, the elastic bladder will shrink to a certain extent due to the internal pressure relief, so that a gap is created between the second flexible magnetic layer and the inner wall of the shell. At this time, the air flow ejected from the spherical block can blow the reinforcing agent coated on the inner wall of the shell, so that the reinforcing agent can be coated more evenly on its surface, and at the same time, it can also promote the drying and molding of the reinforcing agent.

[0010] Preferably, the air inlet end of the air inlet pipe is located at the heat-generating part of the shell processing assembly; the heat dissipated by the shell processing assembly during operation can heat the surrounding air, and then when the heated gas is ejected from the spherical block through the air inlet pipe, it can more effectively promote the drying and solidification of the reinforcing agent, and make full use of the heat emitted by the existing equipment, which is more energy-saving and environmentally friendly.

[0011] Preferably, an elastic sealing strip connects two adjacent second flexible magnetic layers. When the elastic bladder expands, it can cause the second flexible magnetic layer to bulge, creating a large gap between two adjacent second flexible magnetic layers. At this time, the hot air jet from the spherical block will come into contact with the coating block at the gap, which may cause the reinforcing agent in the coating block to solidify. The sealing strip can seal the gap, reducing the contact between the hot air jet and the coating block and affecting its subsequent effective operation.

[0012] Preferably, the sealing strip is arc-shaped, and the middle of the sealing strip bends away from the coating layer. The surface of the sealing strip has a discharge hole, and the width of the discharge hole gradually decreases from the end closer to the coating layer to the end farther away from the coating layer. When the elastic bladder causes the two adjacent flexible magnetic strips to bulge and move away from each other, the two adjacent flexible magnetic strips can gradually straighten the arc-shaped sealing strip, so that the sealing strip can squeeze the coating layer on one side, promoting the extrusion of the reinforcing agent inside from the discharge hole. At the same time, by setting the shape of the discharge hole, the reinforcing agent can easily flow out from the wider end of the discharge hole, but it is difficult to flow in from the narrower end, reducing the backflow of the reinforcing agent. When the sealing strip is straightened, the discharge hole can be in a stretched and open state. When the sealing strip is reset, the discharge hole closes, reducing the contact between the hot air flowing outside the sealing strip and the coating layer.

[0013] Preferably, an elastic strip is provided on one side of the outer end of the air guide groove on the spherical block. The elastic strip can block the air guide groove. When the spherical block is stuck at the outer end of the air guide groove, it is only necessary to pull the second flexible magnetic layer and use an external air pump to evacuate the bulge and elastic bladder. Due to the sealing effect of the elastic strip on the spherical block, the elastic bladder deflates and pulls the spherical block back through the connecting rod until the spherical block disengages from the air guide groove and is effectively reset. This allows the spherical block to work repeatedly. At the same time, when air is ejected from the air guide groove on the spherical block, the elastic strip can be automatically popped open, thus allowing the spherical block to work effectively.

[0014] Preferably, the coating layer is provided with a flexible conveying pipe, the surface of which has several overflow holes, and the conveying pipe is connected to an inlet pipe connected to a delivery pump; before operation, the delivery pump can pump the reinforcing agent raw material into the conveying pipe through the inlet pipe, and the material flows into the interior of the coating layer through the overflow holes and is absorbed, thereby enabling the coating layer to fully and efficiently absorb the reinforcing agent and improving the subsequent use effect of the coating layer.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. The present invention, through the configuration of the shell coating component, can form a reinforcing agent coating film on the inner wall of the already processed shell, further improving the forming quality of the inner wall of the shell, increasing the strength and permeability of the shell, making the casting easier to remove from the shell, and the configuration of the shell coating component can automatically complete the coating work of the inner wall of the shell, saving time and labor. At the same time, the shell coating component can process shells of different shapes and models, improving the applicability of the equipment.

[0017] 2. When the elastic bladder gradually expands, the connecting rod can press the spherical block out from the middle of the funnel-shaped discharge trough and seal the discharge trough. When the elastic bladder contracts and resets, the discharge trough limits the spherical block, allowing the two flexible magnetic layers to more stably and firmly clamp and limit the coated block, reducing the possibility of the two flexible magnetic layers separating due to insufficient attraction. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a three-dimensional schematic diagram of the support base and the elastic bladder in this invention;

[0021] Figure 2 This is a schematic diagram of the structure of the present invention;

[0022] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 yes Figure 3 Enlarged view of point B in the middle;

[0024] Figure 5 This is a partial structural diagram of the coating layer in Embodiment 2;

[0025] In the diagram: 1. Support base; 2. Elastic bladder; 3. Coating layer; 4. Air inlet pipe; 5. Exhaust pipe; 6. Control valve; 7. First flexible magnetic layer; 8. Second flexible magnetic layer; 9. Protrusion; 10. Discharge trough; 11. Connecting rod; 12. Spherical block; 13. Bulb; 14. Protrusion; 15. Air guide groove; 16. Air guide hole; 17. Sealing strip; 18. Discharge hole; 19. Elastic strip; 20. Conveying pipe; 21. Overflow hole; 22. Feed pipe; 23. Feed pipe. Detailed Implementation

[0026] To make the technical means, creative features, achieved objectives, and effects of this invention readily understandable, the invention is further described below in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0027] Example 1:

[0028] Please see Figures 1-2 As shown in the embodiment of the present invention, a manufacturing equipment for precision casting shells using a silica sol process is described. This equipment prepares the shell using the aforementioned reinforcing agent and includes a shell processing component and a shell coating component. The shell coating component includes a support base 1, on which an elastic bladder 2 is connected. The outer surface of the elastic bladder 2 is provided with several sets of coating layers 3 made of absorbent material. An air inlet pipe 4 and an air outlet pipe 5, communicating with the interior of the elastic bladder 2, are respectively connected to the support base 1. The air inlet end of the air inlet pipe 4 is connected to an external air pump. Control valves 6 are respectively provided on the air inlet pipe 4 and the air outlet pipe. When the reinforcing agent and shell raw material are mixed and processed into a shell, the unevenness during mixing results in a lower reinforcing agent content on the inner wall of the formed shell, thus affecting the strength and air permeability of the inner wall. However, the present invention, by setting up a shell coating component, allows the elastic bladder 2 to be placed in a reinforcing agent solution after the shell processing component has finished processing the shell, thus enabling the coating... Layer 3 absorbs the reinforcing agent. Simultaneously, an external air pump inflates the elastic bladder 2, causing it to bulge and enlarge the pores of the coating layer 3, facilitating the absorption of the reinforcing agent. The elastic bladder 2 is then deflated through the exhaust pipe 5 and inserted into the mold opening. It is then inflated again until it adheres to the inner wall of the mold. At this point, the reinforcing agent in the coating layer 3 is evenly and fully coated onto the inner wall of the mold under the pressure of the inner wall and the elastic bladder 2. This forms a reinforcing agent coating film on the already formed inner wall of the mold, further improving the molding quality, increasing the strength and permeability of the mold, and making the casting easier to remove from the mold. The mold coating assembly automatically completes the coating process, saving time and effort. Furthermore, this assembly can process molds of different shapes and sizes, improving the equipment's applicability.

[0029] like Figures 2-4As shown, the surface of the elastic bladder 2 is connected to several first flexible magnetic layers 7. The coating layer 3 is laid on the surface of the first flexible magnetic layers 7. Several second flexible magnetic layers 8, which cooperate with the first flexible magnetic layers 7, are connected to the outer surface of the coating layer 3. When the second flexible magnetic layers 8 are close to the first flexible magnetic layers 7, they can attract each other. Several protrusions 9 are provided on the outer surface of the second flexible magnetic layers 8, and several discharge grooves 10 are opened on the surface of the second flexible magnetic layers 8. When the elastic bladder 2 inflates, it can drive the second flexible magnetic layers 7. When the protrusions 9 on the elastic layer 8 contact the inner wall of the shell, and the elastic bladder 2 continues to bulge, it can drive the first flexible magnetic layer 7 to squeeze the reinforcing agent in the coating layer 3 from the discharge groove 10 onto the inner wall of the shell. At the same time, as the two flexible magnetic layers approach each other, they can attract each other, so that when the elastic bladder 2 shrinks and resets after completing the coating work, the two mutually attracted flexible magnetic layers can continue to squeeze and limit the coating layer 3, reducing the situation where the coating layer 3 expands when the elastic bladder 2 shrinks and re-absorbs the reinforcing agent that has been coated on the surface of the shell.

[0030] The surface of the elastic bladder 2 is connected to several connecting rods 11, and the other end of each connecting rod 11 is connected to a spherical block 12. The discharge trough 10 is funnel-shaped and corresponds to the position of the spherical block 12. When the elastic bladder 2 gradually expands, the connecting rods 11 can press the spherical block 12 out from the middle of the funnel-shaped discharge trough 10 and seal the discharge trough 10. When the elastic bladder 2 contracts and resets, the discharge trough 10 limits the spherical block 12, allowing the two flexible magnetic layers to more stably and firmly clamp and limit the coated block, reducing the possibility of the two flexible magnetic layers separating due to insufficient attraction.

[0031] The elastic bladder 2 has a corresponding support seat 1 with a bulge 13. The outer surface of the bulge 13 has several protrusions 14, and the surface of the bulge 13 has an air outlet. An air outlet valve 15 is provided at the air outlet. The connecting rod 11 and the spherical block 12 are respectively provided with interconnected air guide grooves 16. The side wall of the elastic bladder 2 has an air guide hole 17 that communicates with the air guide grooves 16. When the air inlet pipe 4 is inflated, the air flow valve 15 is closed, and the inflated gas first flows into the bulge 13 and then through the bulge 13. The elastic bladder 2 is inflated synchronously. After the coating layer 3 is completed, the airflow valve 15 is opened to allow the gas in the bladder 13 to be ejected from the spherical block 12 through the air guide hole 17 and the air guide groove 16. At the same time, the elastic bladder 2 will shrink due to the internal pressure relief, creating a gap between the second flexible magnetic layer 8 and the inner wall of the shell. At this time, the airflow ejected from the spherical block 12 can blow the reinforcing agent coated on the inner wall of the shell, so that the reinforcing agent can be coated more evenly on its surface, and at the same time, it can promote the drying and molding of the reinforcing agent.

[0032] The air inlet end of the air inlet pipe 4 is located at the heat-generating part of the shell processing assembly. The heat dissipated by the shell processing assembly during operation can heat the surrounding air. Subsequently, when the heated gas is ejected from the spherical block 12 through the air inlet pipe 4, it can more effectively promote the drying and solidification of the reinforcing agent and make full use of the heat emitted by the existing equipment, which is more energy-saving and environmentally friendly.

[0033] An elastic sealing strip 18 connects the two adjacent second flexible magnetic layers 8. When the elastic bladder 2 expands, it can cause the second flexible magnetic layer 8 to bulge, resulting in a large gap between the two adjacent second flexible magnetic layers 8. At this time, the hot air jet from the spherical block 12 will come into contact with the coating block at the gap, which may cause the reinforcing agent in the coating block to solidify. The sealing strip 18 can seal the gap, reducing the contact between the hot air jet and the coating block and affecting its subsequent effective operation.

[0034] The sealing strip 18 is arc-shaped, and the middle part of the sealing strip 18 bends away from the coating layer 3. The surface of the sealing strip 18 is provided with a discharge hole 19, and the width of the discharge hole 19 gradually decreases from the end closer to the coating layer 3 to the end farther away from the coating layer 3. When the elastic bladder 2 drives the two adjacent flexible magnetic strips to bulge and move away from each other, the two adjacent flexible magnetic layers 8 can gradually straighten the arc-shaped sealing strip 18, so that the sealing strip 18 can squeeze the coating layer 3 on one side, promoting the extrusion of the reinforcing agent inside from the discharge hole 19. At the same time, by setting the shape of the discharge hole 19, the reinforcing agent can easily flow out from the wider end of the discharge hole 19, but it is difficult to flow in from the narrower end, reducing the backflow of the reinforcing agent. When the sealing strip 18 is straightened, the discharge hole 19 can be in the stretched and open state. When the sealing strip 18 is reset, the discharge hole 19 is closed, reducing the contact between the hot air flowing outside the sealing strip 18 and the coating layer 3.

[0035] An elastic strip 20 is provided on one side of the outer end of the air guide groove 16 on the spherical block 12. The elastic strip 20 can block the air guide groove 16. When the spherical block 12 is stuck at the outer end of the air guide groove 16, it is only necessary to pull the second flexible magnetic layer 8 and use an external air pump to evacuate the air from the bulge 13 and the elastic bladder 2. Due to the blocking effect of the elastic strip 20 on the spherical block 12, the elastic bladder 2 deflates and pulls back the spherical block 12 through the connecting rod 11 until the spherical block 12 is disengaged from the air guide groove 16 and effectively reset, so that the operation of the spherical block 12 can be repeated. At the same time, when the air guide groove 16 on the spherical block 12 is vented, the elastic strip 20 can be automatically popped open, so that the operation of the spherical block 12 can be carried out effectively.

[0036] Example 2:

[0037] like Figure 5As shown in the comparative embodiment one, another embodiment of the present invention is as follows: the coating layer 3 is provided with a flexible conveying pipe 21, the surface of the conveying pipe 21 is provided with a plurality of overflow holes 22, and the conveying pipe 21 is connected to an inlet pipe 23 connected to a conveying pump; before the elastic bladder 2 is put into operation, the conveying pump can pump the reinforcing agent raw material into the conveying pipe 21 through the inlet pipe 23, and the raw material flows into the interior of the coating layer 3 through the overflow holes 22 and is absorbed, thereby enabling the coating layer 3 to fully and efficiently absorb the reinforcing agent and improve the subsequent use effect of the coating layer 3.

[0038] Working Principle: This invention utilizes a shell coating assembly. After the shell processing assembly completes the shell processing, the elastic bladder 2 is first placed in a reinforcing agent solution, allowing the coating layer 3 to absorb the reinforcing agent. Simultaneously, an external air pump inflates the elastic bladder 2, causing the coating layer 3 to bulge, increasing its porosity and facilitating the absorption of the reinforcing agent. Then, the elastic bladder 2 is deflated through the exhaust pipe 5, and the deflated bladder 2 is inserted into the shell opening. Subsequently, the elastic bladder 2 is inflated again until it adheres to the inner wall of the shell. At this point, the reinforcing agent in the coating layer 3 is compressed by the inner wall of the shell and the elastic bladder 2, allowing it to absorb the reinforcing agent. The coating is applied evenly and thoroughly to the inner wall of the mold shell, forming a reinforcing agent coating film on the already formed inner wall of the mold shell. This further improves the forming quality of the inner wall of the mold shell, increases the strength and permeability of the mold shell, and makes the casting easier to remove from the shell. The mold shell coating assembly can automatically complete the coating work on the inner wall of the mold shell, saving time and labor. At the same time, this mold shell coating assembly can process mold shells of different shapes and models, improving the applicability of the equipment. When the elastic bladder 2 inflates, it can drive the protrusion 9 on the second flexible magnetic layer 8 to contact the inner wall of the mold shell. As the elastic bladder 2 continues to inflate, it can drive the first flexible magnetic layer 7 to extrude the reinforcing agent in the coating layer 3 from the discharge groove 10 onto the inner wall of the mold shell. As the two flexible magnetic layers approach each other, they attract each other. When the elastic bladder 2 shrinks and retracts after coating, the two attracting flexible magnetic layers continue to compress and limit the coating layer 3, reducing the possibility of the coating layer 3 expanding during the shrinking of the elastic bladder 2 and drawing back the reinforcing agent already coated on the shell surface. When the elastic bladder 2 gradually expands, the connecting rod 11 can press the spherical block 12 out from the center of the funnel-shaped discharge trough 10 and seal the discharge trough 10. When the elastic bladder 2 shrinks and retracts, the limiting effect of the discharge trough 10 on the spherical block 12 allows the two flexible magnetic layers to more stably and firmly clamp and limit the coating block, reducing the risk of separation due to insufficient attraction between the two flexible magnetic layers. In the case where the air inlet pipe 4 is inflated, the airflow valve 15 is closed. The inflated gas flows into the bulge 13 first, and the bulge 13 inflates the elastic bladder 2 synchronously. When the coating layer 3 is finished, the airflow valve 15 is opened to allow the gas in the bulge 13 to be ejected from the spherical block 12 through the air guide hole 17 and the air guide groove 16. At the same time, the elastic bladder 2 will shrink due to the internal pressure relief, creating a gap between the second flexible magnetic layer 8 and the inner wall of the shell. At this time, the airflow ejected from the spherical block 12 can blow the reinforcing agent coated on the inner wall of the shell, so that the reinforcing agent can be coated more evenly on its surface, and at the same time, it can promote the drying and molding of the reinforcing agent.The heat dissipated during the shell forming process can heat the surrounding air. The heated gas, when ejected from the spherical block 12 through the air inlet pipe 4, more effectively promotes the drying and solidification of the reinforcing agent, and fully utilizes the heat dissipated by the existing equipment, resulting in greater energy saving and environmental protection. When the elastic bladder 2 expands, it can cause the second flexible magnetic layer 8 to bulge, creating a larger gap between adjacent second flexible magnetic layers 8. At this time, the hot gas flow ejected from the spherical block 12 will come into contact with the coating block at the gap, thus posing a risk of solidification of the reinforcing agent in the coating block. The sealing strip 18, when installed, can seal the gap, reducing the contact between hot airflow and the coating block and affecting its subsequent effective operation. When the elastic bladder 2 causes the adjacent two flexible magnetic strips to bulge and move away from each other, the adjacent two flexible magnetic layers 8 can gradually straighten the arc-shaped sealing strip 18, allowing the sealing strip 18 to squeeze the coating layer 3 on one side, promoting the extrusion of the reinforcing agent inside from the discharge hole 19. At the same time, by setting the shape of the discharge hole 19, the reinforcing agent can easily flow out from the wider end of the discharge hole 19, but is difficult to flow out from the narrower end. One end flows in, reducing the backflow of reinforcing agent. When the sealing strip 18 is straightened, the outlet 19 can be in a stretched and open state. When the sealing strip 18 is reset, the outlet 19 closes, reducing the contact between the hot air flowing outside the sealing strip 18 and the coating layer 3. When the spherical block 12 is stuck at the outer end of the air guide groove 16, only the second flexible magnetic layer 8 needs to be pulled. An external air pump is used to evacuate air from the bulge 13 and the elastic bladder 2. Due to the sealing effect of the elastic strip 20 on the spherical block 12, the elastic bladder 2 deflates while simultaneously pulling the spherical block back through the connecting rod 11. 12. Until the spherical block 12 detaches from the air guide groove 16 and is effectively reset, the operation of the spherical block 12 can be repeated. Simultaneously, when air is ejected from the air guide groove 16 on the spherical block 12, the elastic strip 20 can be automatically popped open, thus enabling the spherical block 12 to operate effectively. Before operation, the elastic bladder 2 is pumped by the delivery pump through the feed pipe 23 into the delivery pipe 21, and flows into the coating layer 3 through the overflow hole 22 and is absorbed, allowing the coating layer 3 to fully and efficiently absorb the reinforcing agent, improving the subsequent performance of the coating layer 3.

[0039] 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 this invention is defined by the appended claims and their equivalents.

Claims

1. A manufacturing equipment for precision casting shells using a silica sol process, characterized in that: The system includes a shell processing assembly and a shell coating assembly. The shell coating assembly includes a support base (1), on which an elastic bladder (2) is connected. The outer surface of the elastic bladder (2) is provided with a number of coating layers (3) made of water-absorbing material. An air inlet pipe (4) and an air outlet pipe (5) communicating with the inside of the elastic bladder (2) are respectively connected to the support base (1). The air inlet end of the air inlet pipe (4) is connected to an external air pump. Control valves (6) are respectively provided on the air inlet pipe (4) and the air outlet pipe. The surface of the elastic capsule (2) is connected to several first flexible magnetic layers (7), the coating layer (3) is laid on the surface of the first flexible magnetic layer (7), and several second flexible magnetic layers (8) that cooperate with the first flexible magnetic layer (7) are connected to the outer surface of the coating layer (3). When the second flexible magnetic layers (8) are close to the first flexible magnetic layer (7), they can attract each other. The outer surface of the second flexible magnetic layer (8) is provided with several protrusions (9), and several discharge grooves (10) are opened on the surface of the second flexible magnetic layer (8). The surface of the elastic bladder (2) is connected to several connecting rods (11), and the other end of the connecting rods (11) is connected to a spherical block (12). The discharge trough (10) is configured in the shape of a funnel and corresponds to the position of the spherical block (12). The support seat (1) inside the elastic bladder (2) is provided with a bulge (13). The outer surface of the bulge (13) is provided with several protrusions (14). The surface of the bulge (13) is provided with an air outlet. An air flow valve (15) is provided at the air outlet. The connecting rod (11) and the spherical block (12) are respectively provided with interconnected air guide grooves (16). The side wall of the elastic bladder (2) is provided with an air guide hole (17) that communicates with the air guide groove (16).

2. The manufacturing equipment for a silica sol process precision casting shell according to claim 1, characterized in that: The air inlet end of the air inlet pipe (4) is located at the heat-generating part of the shell processing assembly.

3. The manufacturing equipment for a silica sol process precision casting shell according to claim 2, characterized in that: An elastic sealing strip (18) connects the two adjacent flexible magnetic layers (8).

4. The manufacturing equipment for a silica sol process precision casting shell according to claim 3, characterized in that: The sealing strip (18) is configured in an arc shape, and the middle part of the sealing strip (18) bends away from the coating layer (3). The surface of the sealing strip (18) is provided with a discharge hole (19), and the width of the discharge hole (19) gradually decreases from the end close to the coating layer (3) to the end away from the coating layer (3).

5. The manufacturing equipment for a silica sol process precision casting mold shell according to claim 4, characterized in that: An elastic strip (20) is provided on one side of the outer end of the air guide groove (16) on the spherical block (12), and the elastic strip (20) can block the air guide groove (16).

6. The manufacturing equipment for a silica sol process precision casting shell according to claim 5, characterized in that: The coating layer (3) is provided with a flexible conveying pipe (21), and the surface of the conveying pipe (21) is provided with several overflow holes (22). The conveying pipe (21) is connected to an inlet pipe (23) connected to a conveying pump.

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