A vacuum casting apparatus

Abstract

The application discloses a kind of vacuum casting equipment, belong to vacuum casting technical field, including pouring ladle, pouring ladle's inner top wall is equipped with pouring mechanism, pouring ladle's inner bottom wall is equipped with with pouring mechanism matched die placing mechanism, die placing mechanism is used to place die, pouring ladle is fixedly connected with support frame, support frame is installed with feeding mechanism, pouring mechanism includes first mounting plate, first mounting plate is fixedly connected with first telescopic cylinder, the output end of first telescopic cylinder is fixedly connected with second mounting plate, second mounting plate is fixedly connected with a plurality of with die matched heat dissipation hole die.Compared with prior art, the vacuum casting equipment of the application can effectively improve the pouring efficiency, avoid manual setting of heat dissipation hole die, and can realize the automatic demolding of heat dissipation hole die, improve the degree of automation of epoxy resin pouring in dry-type transformer, reduce manual operation, improve product quality and consistency.

Description

Technical Field

[0001] This invention belongs to the field of vacuum casting technology, specifically relating to a vacuum casting device. Background Technology

[0002] In recent years, epoxy resin casting technology has been increasingly used in dry-type transformers to improve the reliability and stability of electronic products. Vacuum casting technology, due to its ability to effectively prevent the introduction of air bubbles and impurities, has become the mainstream process in this field.

[0003] However, the casting process of traditional vacuum casting equipment is complex. Not only does it require manual mold assembly, but after assembly, suitable rectangular structural components must be selected and placed according to the product model to form the necessary heat dissipation holes for the epoxy resin in dry-type transformers. The more heat dissipation holes there are, the more labor is required, leading to a significant decrease in casting efficiency. To maximize the production efficiency of the epoxy resin for dry-type transformers, the rectangular structural components used to form the heat dissipation holes are generally demolded along with the mold. As the number of castings increases, the consumption of these rectangular structural components also increases, thus increasing the cost of vacuum casting of epoxy resin for dry-type transformers. Furthermore, the demolding of these rectangular structural components increases the difficulty of manual operation, easily causing mold damage and product quality variations.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a vacuum casting device that can solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, a specific embodiment of the present invention provides the following technical solution:

[0007] A vacuum casting device includes a casting tank, a casting mechanism mounted on the inner top wall of the casting tank, and a mold placement mechanism matching the casting mechanism mounted on the inner bottom wall of the casting tank. The mold placement mechanism is used to place molds. A support frame is fixedly connected to the casting tank, and a feeding mechanism is mounted on the support frame. The casting mechanism includes a first mounting plate, a first telescopic cylinder fixedly connected to the first mounting plate, a second mounting plate fixedly connected to the output end of the first telescopic cylinder, a plurality of heat dissipation hole molds matching the molds fixedly connected to the second mounting plate, a second telescopic cylinder fixedly connected to the second mounting plate, and a pretreatment mechanism matching the molds fixedly connected to the output end of the second telescopic cylinder. A second conveying pipe is installed between the feeding mechanism and the pretreatment mechanism, and a discharge nozzle for ejecting material from the feeding mechanism is installed on the pretreatment mechanism.

[0008] In one or more embodiments of the present invention, the pretreatment mechanism includes a plurality of third mounting plates, and a connecting pipe assembly matching the mold is installed between the plurality of third mounting plates. A first coating structure matching the mold is fixedly connected to the inner and outer walls of the third mounting plates. A liquid supply mechanism matching the first coating structure is installed on one side of the vacuum casting equipment. The liquid supply mechanism is used to provide a lubricating medium to the first coating structure.

[0009] In one or more embodiments of the present invention, the third mounting plate is provided with a second through hole that matches the heat dissipation hole mold, and the inner wall of the second through hole is fixedly connected with a second coating structure that matches the heat dissipation hole mold.

[0010] In one or more embodiments of the present invention, a material conveying channel and an air conveying channel are formed in the third mounting plate. A nozzle for outputting lubricating medium to the first coating structure and the second coating structure is fixedly connected to the side wall of the material conveying channel. The connecting pipe assembly includes a protective layer. An air conveying pipe and a third material conveying pipe are disposed inside the protective layer. The third material conveying pipe is used to connect to an adjacent air conveying channel. The air conveying pipe is used to connect to an adjacent material conveying channel. The discharge nozzle is connected to the air conveying channel.

[0011] In one or more embodiments of the present invention, the heat dissipation hole mold includes a plurality of support columns, an elastic connecting plate is installed between adjacent support columns, a rectangular block is installed inside the elastic connecting plate, an air bag is fixedly connected to the outer wall of the rectangular block, and a cap is fixedly connected to both ends of the support columns. The vacuum casting equipment includes an air supply mechanism that matches the heat dissipation hole mold.

[0012] In one or more embodiments of the present invention, a threaded rod, an exhaust nozzle, and an air inlet are fixedly connected to one of the covers, the exhaust nozzle and the air inlet both communicating with the airbag, a first through hole matching the threaded rod is provided on the second mounting plate, the threaded rod passes through the first through hole and is threadedly connected to a nut, and a first connection port and a second connection port matching the air inlet and the exhaust nozzle are provided on the second mounting plate.

[0013] In one or more embodiments of the present invention, the air supply mechanism includes an air pump, the air outlet of the air pump is fixedly connected to a first air inlet pipe, the first air inlet pipe is connected to a first connection port, and an exhaust pipe matching the second connection port is installed on the second mounting plate.

[0014] In one or more embodiments of the present invention, a second air inlet pipe is fixedly connected to the first air inlet pipe, a gas storage chamber is fixedly connected to the inner wall of the casting tank, one end of the second air inlet pipe away from the first air inlet pipe is fixedly connected to the gas storage chamber, and a plurality of exhaust valves are fixedly connected to the gas storage chamber.

[0015] In one or more embodiments of the present invention, the mold placement mechanism includes a first placement plate, the first placement plate having a groove matching the mold, a second placement plate being installed on the bottom wall of the groove, a spring being installed between the second placement plate and the bottom wall of the groove, the bottom wall of the first placement plate also having a third through hole matching the spring, and a vibration motor matching the third through hole being fixedly connected to the second placement plate.

[0016] In one or more embodiments of the present invention, the pouring mechanism and the mold placement mechanism are slidably connected inside the pouring tank, and the pouring mechanism and the mold placement mechanism can slide synchronously inside the pouring tank.

[0017] Compared with the prior art, the vacuum casting equipment of the present invention can effectively improve casting efficiency, avoid manual setting of heat dissipation hole molds, and realize automatic demolding of heat dissipation hole molds, improve the automation level of epoxy resin casting in dry-type transformers, reduce manual operation, and improve product quality and consistency. 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 recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a vacuum casting device according to an embodiment of the present invention. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the structure of a vacuum casting device according to an embodiment of the present invention. Figure 2 ;

[0021] Figure 3 This is a schematic diagram of the casting mechanism in one embodiment of the present invention;

[0022] Figure 4 for Figure 3 Schematic diagram of the structure at point A in the middle;

[0023] Figure 5 This is a schematic diagram of the structure of a heat dissipation hole mold in one embodiment of the present invention;

[0024] Figure 6 This is a partial cross-sectional view of the second mounting plate in one embodiment of the present invention;

[0025] Figure 7 This is a cross-sectional view of a heat dissipation hole mold according to an embodiment of the present invention;

[0026] Figure 8 This is a partial cross-sectional view of the gas storage chamber in one embodiment of the present invention;

[0027] Figure 9 This is a schematic diagram of the pretreatment mechanism in one embodiment of the present invention. Figure 1 ;

[0028] Figure 10 This is a partial cross-sectional view of the pretreatment mechanism in one embodiment of the present invention;

[0029] Figure 11 for Figure 10 Schematic diagram of the structure at point B;

[0030] Figure 12 This is a schematic diagram of the connecting pipe assembly in one embodiment of the present invention;

[0031] Figure 13 This is a schematic diagram of the pretreatment mechanism in one embodiment of the present invention. Figure 2 ;

[0032] Figure 14 This is a schematic diagram of the liquid supply mechanism in one embodiment of the present invention;

[0033] Figure 15 This is a partial cross-sectional view of the mold placement mechanism in one embodiment of the present invention;

[0034] Figure 16 This is a schematic diagram of the mold placement mechanism and the mold in one embodiment of the present invention;

[0035] Figure 17This is a diagram showing the material loading state of a vacuum casting device according to an embodiment of the present invention.

[0036] Explanation of key figure labels:

[0037] 1. Casting tank; 2. Cover; 3. Support frame; 4. Guardrail; 5. Feeding mechanism; 501. First conveying pipe; 6. Diverter; 7. Second conveying pipe; 8. Casting mechanism; 9. First slide rail; 10. First slider; 11. First mounting plate; 1101. First strip hole; 12. Second mounting plate; 1201. Second strip hole; 1202. First through hole; 13. Heat dissipation hole mold; 1301. Support column; 1302. Elastic connecting plate; 1303. Rectangular block; 1304. Airbag; 1305. Air inlet; 1306. Exhaust nozzle; 1307. Threaded rod; 1308. Cover; 14. First telescopic cylinder; 15. Nut; 16. Pre-treatment mechanism; 17. Third mounting plate; 1701. Conveying channel; 1702. Air conveying channel; 18. 19. Second through hole; 20. Second coating structure; 21. Nozzle; 22. Connecting pipe assembly; 2201. Protective layer; 2202. Air supply pipe; 2203. Third material supply pipe; 23. Second telescopic cylinder; 24. Discharge nozzle; 25. Elastic connecting rod; 26. Third coating mechanism; 27. Air supply mechanism; 28. Air pump; 29. ​​First air inlet pipe; 2901. Second air inlet pipe; 30. Exhaust pipe; 31. Air storage chamber; 3101. Exhaust valve; 32. Liquid supply mechanism; 33. Liquid storage tank; 34. Liquid supply pipe; 35. Mold placement mechanism; 36. Second slide rail; 37. Second slide path; 38. First placement plate; 3801. Groove; 3802. Third through hole; 39. Spring; 40. Second placement plate; 41. Vibration motor; 42. Mold. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0039] like Figures 1-2As shown, a vacuum casting device according to one embodiment of the present invention includes a casting tank 1 and a vacuum system (not shown in the figure). A cover 2 is rotatably connected to the casting tank 1, and the cover 2 can completely seal the casting tank 1. The vacuum system can evacuate the sealed casting tank 1 to a vacuum. A support frame 3 is installed on the casting tank 1, and a guardrail 4 is fixedly connected to the support frame 3. A feeding mechanism 5 for supplying material to the casting tank 1 is installed on the support frame 3. A first conveying pipe 501 is installed on the feeding mechanism 5. When the material in the feeding mechanism 5 is used up, material can be replenished into the feeding mechanism 5 through the first conveying pipe 501.

[0040] like Figures 1-2 As shown, the lower end of the support frame 3 is fixedly connected to a distributor 6 that matches the feeding mechanism 5. A second conveying pipe 7 is installed on the distributor 6. The end of the second conveying pipe 7 away from the distributor 6 is fixedly connected to a casting mechanism 8. The casting mechanism 8 can output materials to the mold 42 in the casting tank 1, thereby realizing the casting of epoxy resin for dry transformers.

[0041] like Figures 3-9 As shown, the casting mechanism 8 includes a pretreatment mechanism 16, a heat dissipation hole mechanism, and a discharge mechanism. The heat dissipation hole mechanism can be inserted into the mold 42, and the material in the feeding mechanism 5 is output into the mold 42 through the discharge mechanism to complete the casting. After casting, there is no material in the heat dissipation hole mechanism. When the heat dissipation hole mechanism is pulled out, heat dissipation holes are formed. The pretreatment mechanism 16 applies a lubricating medium to the mold 42 and the heat dissipation hole mechanism before casting by the casting mechanism 8, reducing demolding pressure. It reduces friction and adhesion on the surface of the mold 42, ensuring smooth flow of material in the mold, thereby achieving smooth demolding of epoxy resin. Secondly, the lubricating medium can form a protective film on the casting surface of the mold 42, effectively resisting wear and corrosion, thereby extending the service life of the mold and reducing the production cost of the enterprise.

[0042] like Figures 3-7 As shown, the casting mechanism 8 also includes a first slide rail 9, within which a first slider 10 is slidably connected. A first mounting plate 11 is fixedly connected to the end of the first slider 10 furthest from the first slide rail 9. A heat dissipation hole mechanism is mounted on the first mounting plate 11, and a first telescopic cylinder 14 is fixedly connected to the first mounting plate 11. The output end of the first telescopic cylinder 14 is fixedly connected to the heat dissipation hole mechanism. The first telescopic cylinder 14 allows the heat dissipation hole mechanism to move vertically up and down, thus controlling whether it is inserted into the mold 42. After casting is complete and the epoxy resin has formed in the mold 42, the first telescopic cylinder 14 can be used to lift the heat dissipation hole mechanism upwards, separating it from the epoxy resin and automating the demolding of the heat dissipation hole portion. This saves time wasted on manual demolding and improves the production efficiency of epoxy resin for dry-type transformers.

[0043] like Figures 3-7 As shown, the heat dissipation hole mechanism includes a second mounting plate 12, which is detachably connected to the output end of the first telescopic cylinder 14. Several heat dissipation hole molds 13 are detachably mounted on the second mounting plate 12, and the position where the heat dissipation hole molds 13 are inserted into the mold 42 is the position of the heat dissipation hole.

[0044] To ensure that the heat dissipation hole mechanism can adapt to different specifications of dry-type transformers, such as... Figures 3-7 As shown, the second mounting plate 12 is pre-set with multiple first through holes 1202, and the heat dissipation hole mold 13 is fixedly connected with multiple threaded rods 1307 that match the first through holes 1202. The threaded rods 1307 pass through the first through holes 1202 and are threadedly connected with nuts 15, so as to realize the detachable installation of the second mounting plate 12 and the heat dissipation hole mold 13. Moreover, through the first through holes 1202, the corresponding number and size of heat dissipation hole molds 13 can be installed according to the actual production needs.

[0045] During the pouring process, to make it easier for the heat dissipation hole mold 13 to be demolded, such as... Figures 3-7 As shown, the heat dissipation hole mold 13 includes multiple support columns 1301, and elastic connecting plates 1302 are connected between adjacent support columns 1301. In this embodiment, there are four support columns 1301 and four elastic connecting plates 1302, which together form a hollow rectangular body. Rectangular blocks 1303 are installed inside the multiple elastic connecting plates 1302, and caps 1308 matching the elastic connecting plates 1302 are fixedly connected to both ends of the rectangular blocks 1303, sealing both ends of the hollow rectangular body. An airbag 1304 is fixedly connected to the outer wall of the rectangular blocks 1303. When the airbag 1304 is inflated, it can push the elastic connecting plates 1302 away from the end of the airbag 1304. When the airbag 1304 is in an inflated state, the elastic connecting plates 1302 have an arc-shaped structure that bends towards the airbag 1304.

[0046] Specifically, such as Figure 7 As shown, during casting, the airbag 1304 is inflated, pushing the elastic connecting plate 1302 outward, making it straight. After the epoxy resin solidifies, the airbag 1304 releases the gas, causing the elastic connecting plate 1302 to deform and return to its arc shape. At this time, the contact area between the heat dissipation hole mold 13 and the epoxy resin decreases sharply. During the upward pulling of the heat dissipation hole mold 13 by the first telescopic cylinder 14, the heat dissipation hole mold 13 is more easily separated from the epoxy resin, making demolding easier.

[0047] Preferably, one end face of the airbag 1304 is fixedly connected to the rectangular block 1303, and the other end face is fixedly connected to the elastic connecting plate 1302. During the degassing process of the airbag 1304, the airbag 1304 generates a pulling force on the elastic connecting plate 1302, which promotes the deformation of the elastic connecting plate 1302 and promotes the elastic connecting plate 1302 to change from a straight plate to an arc plate, so as to realize the separation of the elastic connecting plate 1302 from the epoxy resin and avoid the situation where the epoxy resin and the elastic connecting plate 1302 are too well bonded, which would affect the smooth demolding of the heat dissipation hole mold 13.

[0048] like Figures 1 to 7 As shown, the vacuum casting equipment includes a gas supply mechanism 27 for supplying gas to the heat dissipation hole mold 13. The gas supply mechanism 27 includes an air pump 28, which is located on one side of the casting tank 1. A first air inlet pipe 29 is fixedly connected to the air outlet of the air pump 28, and the end of the first air inlet pipe 29 away from the air pump 28 is fixedly connected to a second mounting plate 12. The second mounting plate 12 is provided with a first connection port (not shown in the figure) and a second connection port (not shown in the figure). The first air inlet pipe 29 is connected to the first connection port. One end of the threaded rod 1307 fixedly connected to the heat dissipation hole mold 13 is fixedly connected to an air inlet nozzle 1305 and an air outlet nozzle 1306. The air inlet nozzle 1305 is inserted into the first connection port, and the air outlet nozzle 1306 is inserted into the second connection port, thereby completing the gas supply connection between the gas supply mechanism 27 and the heat dissipation hole mold 13.

[0049] Among them, such as Figures 1 to 7 As shown, an exhaust pipe 30 is fixedly connected to the second connection port, with the end of the exhaust pipe 30 furthest from the second connection port located outside the casting tank 1. That is, when the airbag 1304 is inflated, the air pump 28 starts, and gas sequentially passes through the first air inlet pipe 29, the first connection port, and the air inlet nozzle 1305 into the airbag 1304, causing the airbag 1304 to inflate. When the airbag 1304 deflates, the gas inside the airbag 1304 sequentially passes through the exhaust nozzle 1306, the second connection port, and the exhaust pipe 30, causing the airbag 1304 to deflate.

[0050] The end of the exhaust pipe 30 furthest from the second connection port can be connected to the air inlet of the air pump 28. Controlled by a valve, when the airbag 1304 needs to be vented, the valve closes, and the air pump 28 starts, venting the gas from the airbag 1304. Similarly, a valve is also required on the first air inlet pipe 29. When the air pump 28 vents gas from the airbag 1304, the valve on the first air inlet pipe 29 is closed.

[0051] Furthermore, the air inlet 1305 and exhaust outlet 1306 enable the positioning and installation of the heat dissipation hole mold 13, forming a positioning mechanism with the air inlet 1305, exhaust outlet 1306, and threaded rod 1307. When the exhaust outlet 1306 and air inlet 1305 are respectively inserted into the first and second connecting ports, the heat dissipation hole mold 13 will no longer rotate, and then the nut 15 can be screwed onto the threaded rod 1307.

[0052] In actual use, the heat dissipation hole mold 13 can also reciprocate to inflate and deflate the air bag 1304, realizing the continuous movement of the elastic connecting plate 1302. During the deformation process, the elastic connecting plate 1302 will drive the epoxy resin to move in the mold 42, increase the flow speed of the epoxy resin in the mold 42, thereby improving the efficiency of epoxy resin casting. Furthermore, the extrusion of the elastic connecting plate 1302 can further prevent the generation of air bubbles in the epoxy resin.

[0053] like Figures 1-9 As shown, a second telescopic cylinder 23 is fixedly connected to the second mounting plate 12. One end of the second telescopic cylinder 23 passes through the first mounting plate 11 and is slidably connected to the first mounting plate 11. One end of the pretreatment mechanism 16 is detachably connected to the output end of the second telescopic cylinder 23. Since a lifting mechanism is usually installed on the mold 42, the lifting mechanism is used to lift and move the mold 42 after casting. Therefore, the pretreatment mechanism 16 includes multiple third mounting plates 17, and a connecting pipe assembly 22 is fixedly connected between adjacent third mounting plates 17. The multiple third mounting plates 17 are matched with the mold 42, and the outer wall of the third mounting plate 17 can contact the casting surface of the mold 42. The connecting pipe assembly 22 is U-shaped. The second telescopic cylinder 23 can move the third mounting plate 17 downward so that the lower end face of the third mounting plate 17 contacts the bottom wall of the mold 42. The connecting pipe assembly 22 can ensure that it is not blocked by the lifting mechanism, so that the third mounting plate 17 can smoothly enter the mold 42.

[0054] like Figures 1-9 As shown, a first coating structure 18 is fixedly connected to the side wall of the third mounting plate 17. The first coating structure 18 can contact the casting surface of the mold 42. The third mounting plate 17 also has a second through hole 19 that matches the heat dissipation hole mold 13. The inner wall of the second through hole 19 is fixedly connected to a second coating structure 20 that contacts the outer wall of the heat dissipation hole mold 13. That is, the third mounting plate 17 is inserted into the heat dissipation hole mold 13 through the second coating structure 20 and can slide along the direction set by the heat dissipation hole mold 13.

[0055] like Figures 1-9As shown, the vacuum casting equipment includes a liquid supply mechanism 32 for providing a lubricating medium to the first coating structure 18 and the second coating structure 20. That is, during the process of the first coating structure 18 and the second coating structure 20 contacting the mold 42 and the heat dissipation hole mold 13, a lubricating medium can be applied to the contact surfaces of the mold 42 and the heat dissipation hole mold 13, which facilitates the subsequent demolding of the mold 42 and the heat dissipation hole mold 13.

[0056] Specifically, such as Figures 1 to 11 As shown, the liquid supply mechanism 32 includes a liquid storage tank 33, which is mounted on the support frame 3. A liquid delivery pipe 34 is fixedly connected between the liquid storage tank 33 and the third mounting plate 17. A material delivery channel 1701 is formed in the third mounting plate 17. The lubricating medium in the liquid storage tank 33 is delivered to the material delivery channel 1701 through the liquid delivery pipe 34. A nozzle 21 matching the first coating structure 18 and the second coating structure 20 is fixedly connected to the side wall of the material delivery channel 1701. The nozzle 21 can evenly spray the lubricating medium in the material delivery channel 1701 onto the first coating structure 18 and the second coating structure 20. The third mounting plate 17 is driven downward by the second telescopic cylinder 23, so that the first coating structure 18 and the second coating structure 20 contact the mold 42 and the heat dissipation hole mold 13 respectively, thereby completing the coating action.

[0057] like Figures 1 to 11 As shown, the discharge mechanism is integrally formed on the pretreatment mechanism 16. The discharge mechanism includes an air conveying channel 1702. A discharge nozzle 24, matching the air conveying channel 1702, is fixedly connected to the third mounting plate 17. The discharge nozzle 24 is used to spray the material from the air conveying channel 1702. The second conveying pipe 7 and the air conveying channel 1702 are connected. The material in the feeding mechanism 5 passes sequentially through the distributor 6 and the second conveying pipe 7, finally entering the air conveying channel 1702, and is then sprayed out of the air conveying channel 1702 by the discharge nozzle 24.

[0058] like Figures 1 to 11 As shown, since there are multiple second conveying pipes 7, that is, multiple conveying channels 1701 and multiple air conveying channels 1702, an air conveying pipe 2202 is installed between adjacent conveying channels 1701, and a third conveying pipe 2203 is installed between adjacent air conveying channels 1702. The lubricating medium and the material are conveyed through the air conveying pipe 2202 and the third conveying pipe 2203 respectively.

[0059] like Figures 1-12 As shown, in order to protect the gas supply pipe 2202 and the third material supply pipe 2203, the connecting pipe assembly 22 includes a protective layer 2201. The protective layer 2201 is disposed on the outside of the gas supply pipe 2202 and the third material supply pipe 2203, and the protective layer 2201 is made of metal, which can always keep the gas supply pipe 2202 and the third material supply pipe 2203 in a U-shape.

[0060] like Figure 13 As shown, since there are multiple third mounting plates 17, there are certain gaps between them to prevent the hoisting mechanism from affecting them. During the downward movement of the third mounting plates 17 via the second telescopic cylinder 23, the gaps between adjacent third mounting plates 17 cannot be coated with lubricating medium by the first coating structure 18. To solve this problem, elastic connecting rods 25 are fixedly connected to both ends of the third mounting plates 17. When the elastic connecting rods 25 contact the hoisting mechanism, they deform. As the third mounting plates 17 continue to move downward, the elastic connecting rods 25 lose contact with the hoisting mechanism and return to their original shape, filling the gaps between the two third mounting plates 17. A third coating mechanism 26 is fixedly connected to the elastic connecting rods 25. The third coating mechanism 26 can contact the casting surface of the mold 42, and the lubricating medium on the first coating structure 18 can be transferred to the third coating mechanism 26, which then coats the lubricating medium onto the casting surface of the mold 42.

[0061] like Figure 4 As shown, the first mounting plate 11 has a first strip hole 1101 that matches the second coating structure 20, and the second mounting plate 12 has a second strip hole 1201 that matches the second coating structure 20. In the initial state, the third mounting plate 17 is attached to the second mounting plate 12, and the second coating structure 20 passes through the second strip hole 1201 and the first strip hole 1101 in sequence. By setting the first strip hole 1101 and the first through hole 1202, the influence of the second coating structure 20 on the casting can be avoided.

[0062] Of course, the second coating structure 20 can also be a flexible pipe, and a storage structure matching the second coating structure 20 can be set on the second mounting plate 12 to prevent the second coating structure 20 from affecting the pouring process.

[0063] In actual use, the second telescopic cylinder 23 drives the third mounting plate 17 to move downwards, while the liquid supply mechanism 32 provides lubricating medium to the first coating structure 18 and the second coating structure 20. When the lower end face of the third mounting plate 17 contacts the inner bottom wall of the mold 42, the coating of the lubricating medium is completed. When the second telescopic cylinder 23 drives the third mounting plate 17 to move in the opposite direction, the discharge nozzle 24 sprays out the casting material, which greatly saves the time of material spraying and helps to improve the preparation efficiency of epoxy resin for dry-type transformers. Moreover, since the casting and solidification of epoxy resin requires a certain temperature, the material can be injected immediately after the lubricating medium is coated, which avoids the lubricating medium from losing its role in assisting demolding after drying in a high-temperature environment.

[0064] Preferably, the discharge nozzle 24 is embedded in the third mounting plate 17, and the bottom wall of the third mounting plate 17 is also fixedly connected to the first coating structure 18. When the first coating structure 18 on the bottom wall of the third mounting plate 17 contacts the inner bottom wall of the mold 42, the coating of the lubricating medium can also be achieved.

[0065] like Figure 1 , Figure 15 As shown, a mold placement mechanism 35 is fixedly connected to the bottom wall of the casting tank 1, and the mold 42 is placed on the mold placement mechanism 35. Specifically, the mold placement mechanism 35 includes a second slide rail 36, which is fixedly connected to the inner bottom of the casting tank 1. A second slide rail 37 is slidably connected within the second slide rail 36, and a first placement plate 38 is fixedly connected to the second slide rail 37. A groove 3801 matching the mold 42 is provided on the first placement plate 38, and a second placement plate 40 is slidably connected vertically within the groove 3801. A spring 39 is fixedly connected between the second placement plate 40 and the bottom wall of the groove 3801. A third through hole 3802 is also fixedly connected to the first placement plate 38, and a vibration motor 41 matching the third through hole 3802 is fixedly connected to the second placement plate 40.

[0066] Furthermore, when the vibration motor 41 is started, it can vibrate the second placement plate 40 in the groove 3801. Since the mold 42 is placed on the second placement plate 40, the mold 42 will also vibrate with the vibration of the second placement plate 40. The material is injected into the mold 42. Through the high-speed vibration generated by the vibration motor 41, air bubbles in the material in the mold 42 can be further eliminated, so as to avoid affecting the epoxy resin casting quality of the dry-type transformer due to air bubbles.

[0067] In actual use, due to the presence of the vibration motor 41, during the material discharge process of the pretreatment mechanism 16 in conjunction with the discharge mechanism, the second telescopic cylinder 23 moves upward a portion, and the discharge mechanism discharges the material. Then, the discharge can be stopped, and the vibration motor 41 compacts the material in the mold 42 before discharging again. This changes the single injection of epoxy resin to multiple injections, and the material is compacted during each injection, eliminating air bubbles and preventing them from affecting product quality.

[0068] Since both the pouring mechanism 8 and the mold placement mechanism 35 are slidably connected inside the pouring tank 1, such as Figure 17 As shown, when placing the mold 42, both the pouring mechanism 8 and the mold placement mechanism 35 are located outside the pouring tank 1, waiting for the mold 42 to be placed. After the mold 42 is placed, the pouring mechanism 8 is directly activated to pre-process the mold 42 on the mold placement mechanism 35. After entering the pouring tank 1, when the pouring tank 1 is pumped to a vibration state, pouring is carried out directly, thereby improving pouring efficiency and increasing the production speed of the product.

[0069] Since casting tank 1 is under vacuum during the casting process, opening the cover 2 requires breaking the vacuum in casting tank 1. To avoid the sudden influx of excessive cold air affecting product quality, such as... Figures 1 to 8 As shown, a second air inlet pipe 2901 is fixedly connected to the first air inlet pipe 29. A gas storage chamber 31 is fixedly connected to the end of the second air inlet pipe 29 away from the first air inlet pipe 29. The gas storage chamber 31 is installed on the inner wall of the casting tank 1. The gas storage chamber 31 is used to store gas to break the vacuum state inside the casting tank 1. Multiple exhaust valves 3101 are fixedly connected to the gas storage chamber 31. After the exhaust valves 3101 discharge the gas, the vacuum state inside the casting tank 1 can be broken, preventing the pump from entering too much cold air and affecting the product inside the casting tank 1.

[0070] When using, such as Figures 1-2 As shown, first, the cover 2 is opened, and then the pouring mechanism 8 and the mold placement mechanism 35 are activated, moving them to the outside of the pouring tank 1. After the mold 42 is placed on the second placement plate 40, the pouring mechanism 8 and the mold placement mechanism 35 return to the pouring tank 1. During this process, the second telescopic cylinder 23 is activated, forcing the third mounting plate 17 to move downwards, so that the first coating structure 18, the third coating mechanism 26, and the second coating structure 20 respectively coat the pouring surface of the mold 42 and the surface of the heat dissipation hole mold 13 with lubricating medium. After the pouring mechanism 8 and the mold placement mechanism 35 are completely inside the pouring tank 1, the cover 2 is closed, and then the pouring tank 1 is evacuated to a vacuum state. When the pouring tank 1 is in a vacuum state, the material is discharged through the discharge mechanism, and at the same time, the vibration motor 41 vibrates to complete the pouring of the mold 42.

[0071] After the material poured into mold 42 solidifies, when it is necessary to remove the heat dissipation hole mold 13, the gas in air bag 1304 is discharged through exhaust pipe 30. After the gas in air bag 1304 is discharged, elastic connecting plate 1302 deforms, and most of elastic connecting plate 1302 loses contact with the material. The contact area between heat dissipation hole mold 13 and material is greatly reduced, reducing the friction between heat dissipation hole mold 13 and material. The second mounting plate 12 is lifted upward by the first telescopic cylinder 14, and the heat dissipation hole mold 13 is removed from the solidified material, realizing the demolding of heat dissipation holes.

[0072] This invention can effectively improve casting efficiency, avoid manual setting of heat dissipation hole mold 13, and realize automatic demolding of heat dissipation hole mold 13, improve the automation level of epoxy resin casting in dry-type transformers, reduce manual operation, and improve product quality and consistency.

[0073] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0074] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A vacuum casting device, characterized in that, include: A casting tank, wherein a casting mechanism is installed on the inner top wall of the casting tank, and a mold placement mechanism matching the casting mechanism is installed on the inner bottom wall of the casting tank, the mold placement mechanism being used to place the mold; A support frame is fixedly connected to the casting tank, and a feeding mechanism is installed on the support frame; The casting mechanism includes a first mounting plate, on which a first telescopic cylinder is fixedly connected. A second mounting plate is fixedly connected to the output end of the first telescopic cylinder. A plurality of heat dissipation hole molds matching the mold are fixedly connected to the second mounting plate. A second telescopic cylinder is fixedly connected to the second mounting plate. A pre-treatment mechanism matching the mold is fixedly connected to the output end of the second telescopic cylinder. A second conveying pipe is installed between the feeding mechanism and the pre-treatment mechanism. A discharge nozzle for spraying out the material in the feeding mechanism is installed on the pre-treatment mechanism. The heat dissipation hole mold includes multiple support columns, an elastic connecting plate is installed between adjacent support columns, a rectangular block is installed inside the elastic connecting plate, an air bag is fixedly connected to the outer wall of the rectangular block, and a cap is fixedly connected to both ends of the support column. The vacuum casting equipment includes an air supply mechanism that matches the heat dissipation hole mold; One of the caps is fixedly connected to a threaded rod, an exhaust nozzle, and an air inlet, both of which communicate with the airbag; The second mounting plate has a first through hole that matches the threaded rod, and the threaded rod passes through the first through hole and is threadedly connected to a nut; The second mounting plate has a first connection port and a second connection port that match the air intake and exhaust nozzles; The air supply mechanism includes an air pump, the air outlet of which is fixedly connected to a first air inlet pipe, the first air inlet pipe being connected to a first connection port, and an exhaust pipe matching the second connection port being installed on the second mounting plate. A second air inlet pipe is fixedly connected to the first air inlet pipe, and a gas storage chamber is fixedly connected to the inner wall of the casting tank. The end of the second air inlet pipe away from the first air inlet pipe is fixedly connected to the gas storage chamber, and a number of exhaust valves are fixedly connected to the gas storage chamber. The mold placement mechanism includes a first placement plate with a groove matching the mold, a second placement plate installed on the bottom wall of the groove, and a spring installed between the second placement plate and the bottom wall of the groove. The bottom wall of the first placement plate is also provided with a third through hole that matches the spring, and a vibration motor that matches the third through hole is fixedly connected to the second placement plate. The pretreatment mechanism includes multiple third mounting plates, and a connecting pipe assembly that matches the mold is installed between the multiple third mounting plates; The inner and outer walls of the third mounting plate are both fixedly connected with a first coating structure that matches the mold. A liquid supply mechanism that matches the first coating structure is installed on one side of the vacuum casting equipment. The liquid supply mechanism is used to provide a lubricating medium to the first coating structure. The third mounting plate has a second through hole that matches the heat dissipation hole mold, and the inner wall of the second through hole is fixedly connected with a second coating structure that matches the heat dissipation hole mold. The third mounting plate has a material conveying channel and an air conveying channel. The side wall of the material conveying channel is fixedly connected to a nozzle for outputting lubricating medium to the first coating structure and the second coating structure. The connecting pipe assembly includes a protective layer, and an air conveying pipe and a third material conveying pipe are disposed inside the protective layer. The third material conveying pipe is used to connect to an adjacent air conveying channel, and the air conveying pipe is used to connect to an adjacent material conveying channel. The discharge nozzle is connected to the air supply channel.

2. The vacuum casting equipment according to claim 1, characterized in that, Both the pouring mechanism and the mold placement mechanism are slidably connected inside the pouring tank, and the pouring mechanism and the mold placement mechanism can slide synchronously inside the pouring tank.

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