Device and method for uniformly mixing precoated sand

Abstract

The invention relates to a device and method for uniformly mixing precoated sand and relates to the technical field of precoated sand stirring and mixing, a stirring mechanism divides a mixing tank into an upper cavity and a lower cavity, after precoated sand is formed through mixing in the upper cavity, the precoated sand can be discharged into the lower cavity and cooled in the lower cavity, the upper cavity can continue to conduct stirring and mixing operation, and therefore the precoated sand can be uniformly mixed. Furthermore, stirring and cooling of the precoated sand can be separately operated through the stirring mechanism, continuous stirring can be conducted in the upper cavity, the working procedures in the upper cavity are reduced, the mixing efficiency of the whole device is improved, after the precoated sand is mixed, the uncooled precoated sand can be screened through the screening mechanism, and large-particle precoated sand is fed into the lower cavity to be cooled; and the screened small-particle precoated sand can be sent back into the screen drum again, new sand and a resin mixture are added and then continue to be mixed, the resin mixture continues to be attached to the surface of the small-particle precoated sand, the small-particle precoated sand becomes large-particle precoated sand, and waste of the small-particle precoated sand is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of coated sand mixing, and particularly relates to a device and method for uniformly mixing coated sand materials. Background Art

[0002] Coated sand mainly uses high-quality selected natural quartz sand as the original sand, thermoplastic phenolic resin, hexamine, and reinforcing agents as raw materials. The sand is preheated to a certain temperature, and resin is added to make it melt and mixed evenly with a mixture such as an aqueous solution of hexamine and a lubricant to form a resin mixture. Then, stirring is carried out to coat the resin on the surface of the sand grains, and after cooling, coated sand is obtained. This operation requires the use of a professional device for uniformly mixing coated sand.

[0003] The patent with publication number CN211564408U discloses a coated sand production device. This prior art is convenient to use, can quickly cool the coated sand obtained by high-temperature production of coated sand, can drive the stirring blades to quickly stir through the drive of a motor, mix and cool evenly, improve production efficiency, can screen the cooled coated sand to prevent the coated sand with some sand grain diameters not meeting the production requirements from affecting the product quality, and can buffer and shock-absorb the screening mechanism.

[0004] However, the above prior art has the following technical defects: First, after uniformly mixing the coated sand in this prior art, the coated sand is still stirred in the original mixing tank. After the coated sand is stirred and screened and discharged, the next stirring and mixing can be carried out. The entire operation process is long, resulting in low production efficiency of the coated sand mixing of this device.

[0005] Second, the screening of the coated sand in this prior art is after cooling, which will cause the resin on the surface of the small particle coated sand that does not meet the production requirements to have solidified, and it is impossible to rework the surface to continue coating and increase its volume. Therefore, these small particle coated sands can only be scrapped after being screened out, seriously wasting production resources and causing a large amount of economic losses.

[0006] In summary, there is still room for improvement in this prior art in terms of improving its production efficiency and avoiding waste of small particle coated sand. Therefore, those skilled in the art have proposed a device that can accelerate the production efficiency of coated sand mixing and rework small particle coated sand before cooling. Summary of the Invention

[0007] To solve the above problems, in the first aspect, the present application provides a device for uniformly mixing coated sand materials, adopting the following technical solution: It includes a base, and two rotating seats are symmetrically installed on the upper side of the base.

[0008] A stirring mechanism is rotatably installed between two rotating seats. The stirring mechanism includes a mixing tank with a funnel-shaped lower end. An isolation ring is arranged inside the mixing tank, and a funnel is installed on the inner side surface of the isolation ring. A shaft rod is rotatably arranged jointly in the funnel pipe at the lower end of the mixing tank and in the funnel. An upper auger and a lower auger are respectively arranged on the shaft rod in the funnel pipe of the funnel and in the funnel pipe of the mixing tank. A plurality of uniformly distributed stirring blades are installed on the side surface of the shaft rod.

[0009] A rotating plate is rotatably installed at the center of the upper end of the mixing tank. A screening mechanism is further included. The screening mechanism includes a plurality of arc-shaped frames distributed annularly with their upper ends connected to the rotating plate. A sieve cylinder is jointly installed on the inner sides of all the arc-shaped frames. An iron plate that slides up and down is arranged above the rotating plate. An arc-shaped plate connected to the iron plate is arranged between two adjacent arc-shaped frames. An opening is formed on the side surface of the arc-shaped plate above the sieve cylinder.

[0010] A material return mechanism is further provided. The material return mechanism includes a material lifting ring located outside all the arc-shaped plates and with its upper surface inclined inward.

[0011] Preferably, an upper sealing cover for closing its port is installed on the surface of the shaft rod above the funnel. Transfer cylinders connected to the shaft rod are symmetrically installed on the lower side of the mixing tank.

[0012] Preferably, a lower sealing cover for closing the funnel port below the mixing tank is slidably arranged on the shaft rod. A discharge cylinder with a telescopic arm extending into the mixing tank and connected to the lower sealing cover is installed on the lower side of the mixing tank.

[0013] Preferably, a toothed ring is installed on the outer side of the rotating plate. A screening motor is installed on the side surface of the mixing tank. A gear meshing with the toothed ring is installed at the driving end of the screening motor.

[0014] Preferably, a plurality of vertical rods are symmetrically installed on the upper side of the material lifting ring. The upper ends of the vertical rods extend to the outside of the material lifting ring and are installed with iron blocks. Card slots are formed on the side surfaces of the iron blocks.

[0015] Preferably, a fixed seat is installed on the upper side of the mixing tank on one side of the iron block. A trapezoidal block with an upward inclined surface is slidably arranged inside the fixed seat. A spring is arranged on one side of the trapezoidal block.

[0016] Preferably, an extrusion block with its upper end extending to the outside of the fixed seat is arranged at the inclined surface of the trapezoidal block. A clamping part extending into the card slot is installed on the side surface of the trapezoidal block.

[0017] Preferably, a cross plate is arranged directly above the iron plate. A main electromagnet is rotatably installed at the center of the lower side of the cross plate. Auxiliary electromagnets are installed above each iron block on the lower side of the cross plate. A lifting mechanism is arranged on the cross plate, and the lifting mechanism drives the cross plate to move up and down.

[0018] Preferably, a rotary motor with a driving end connected to the rotating shaft of the mixing tank is installed on the side of one of the rotary seats, and a support seat adapted to the mixing tank is installed on the upper side of the base on one side of the stirring mechanism.

[0019] On the other hand, the present application also discloses a method for uniformly mixing coated sand materials, which includes the following steps: S1. Sand material mixing: Put quartz sand and resin mixture into the stirring mechanism and stir them to make them evenly mixed to form coated sand.

[0020] S2. Structure expansion: Let the stirring mechanism lie down and at the same time expand the structure of the screening mechanism, and screen the coated sand in the screening cylinder.

[0021] S3. Sand material transfer: Send the large-particle coated sand in the upper cavity into the lower cavity for cooling.

[0022] S4. Sand material return to the cylinder: Send the small-particle coated sand outside the screening cylinder back into the screening cylinder, and add quartz sand and resin mixture again to continue mixing.

[0023] S5. Sand material discharge: Discharge the cooled coated sand in the lower cavity.

[0024] In summary, the present application includes at least one of the following beneficial technical effects of the coated sand material mixing and homogenizing device and method: First, the stirring mechanism of the present invention divides the mixing tank into upper and lower chambers. After the coated sand is mixed in the upper chamber, the coated sand can be discharged into the lower chamber for cooling, and the upper chamber can continue the stirring and mixing operation. Therefore, the stirring mechanism can separate the stirring and cooling of the coated sand, allowing the upper chamber to continuously perform the stirring and mixing operation, reducing the working process in the upper chamber, and increasing the mixing efficiency of the entire device.

[0025] Second, through the cooperation of the stirring mechanism and the screening mechanism, after the coated sand is mixed, the screening mechanism can be used to screen the uncooled coated sand. The large-particle coated sand is sent to the lower chamber for cooling, and the screened small-particle coated sand can be sent back into the screening cylinder, and new sand and resin mixture are added to continue mixing, so that the surface of the small-particle coated sand continues to adhere to the resin mixture to become large-particle coated sand, avoiding the waste of small-particle coated sand, saving costs, and reducing economic losses. Description of the Drawings

[0026] The present invention will be further described below with reference to the drawings and embodiments.

[0027] Figure 1 is the structural schematic diagram of the present invention.

[0028] Figure 2 is the cross-sectional view of the stirring mechanism of the present invention.

[0029] Figure 3 is a schematic diagram of the internal structure of the main body of the present invention.

[0030] Figure 4 is a side view of the present invention.

[0031] Figure 5 is a schematic diagram of the structure of the second state of the present invention.

[0032] Figure 6 is a schematic diagram of the structure of the screening mechanism of the present invention.

[0033] Figure 7 is a schematic diagram of the structure of the screening mechanism in the working state of the present invention.

[0034] Figure 8 is a cross-sectional view of the second state of the present invention.

[0035] Figure 9 is a schematic diagram of the structure of the cross plate assembly of the present invention.

[0036] Figure 10 is a schematic diagram of the structure of the lifting mechanism of the present invention.

[0037] Figure 11 is a schematic diagram of the structure of the material return mechanism of the present invention.

[0038] Figure 12 is a cross-sectional view of the fixed seat of the present invention.

[0039] In the figure: 1. Base; 2. Stirring mechanism; 201. Mixing tank; 202. Spacer ring; 203. Hopper; 204. Shaft rod; 205. Lower auger; 206. Upper auger; 207. Stirring blade; 208. Upper sealing cover; 209. Lower sealing cover; 210. Discharging electric cylinder; 211. Lower plate; 212. Material transfer electric cylinder; 213. Discharge pipe; 214. Rotating plate; 215. Feeding pipe; 216. Sealing cover; 3. Screening mechanism; 301. Arc-shaped frame; 302. Screen cylinder; 303. Iron plate; 304. Arc-shaped plate; 305. Opening; 306. Screening motor; 307. Gear; 308. Rectangular groove; 309. Tooth ring; 4. Material return mechanism; 401. Lifting ring; 402. Vertical rod; 403. Iron block; 404. Card slot; 405. Fixed seat; 406. Trapezoidal block; 407. Spring; 408. Extrusion block; 409. Limiting plate; 410. Clamping part; 5. Lifting mechanism; 501. U-shaped frame; 502. Threaded cylinder; 503. Screw; 504. Lifting motor; 505. Main bevel gear; 506. Sub bevel gear; 507. Limiting rod; 6. Cross plate; 7. Main electromagnet; 8. Sub electromagnet; 9. Rotating seat; 10. Rotating motor; 11. Support seat; 12. Fixed disk; 13. Jack; 14. Fixed cylinder; 15. Plug. Detailed implementation manners

[0040] The following will combine Figure 1 - Figure 12 to describe the embodiments of the present invention in detail.

[0041] An embodiment of the present application discloses a device and method for uniformly mixing coated sand. Through the cooperation of a stirring mechanism and a screening mechanism, after the coated sand is mixed, the screening mechanism can be used to screen the uncooled coated sand. The large-particle coated sand is sent to the lower cavity for cooling, while the screened small-particle coated sand can be sent back into the screening cylinder. After adding new sand and resin mixture, the mixing continues, enabling the surface of the small-particle coated sand to continue to adhere to the resin mixture and turn into large-particle coated sand, avoiding the waste of small-particle coated sand, saving costs, and reducing economic losses.

[0042] Embodiment 1: As Figure 1 shown, it includes a base 1. Two rotating seats 9 are symmetrically installed on the upper side of the base 1. A stirring mechanism 2 is rotatably installed between the two rotating seats 9. The rotating seats 9 support the stirring mechanism 2, and at the same time, the stirring mechanism 2 can rotate around the rotating connection with the rotating seats 9.

[0043] As Figure 2 and Figure 3 shown, the stirring mechanism 2 includes a mixing tank 201 with a funnel-shaped lower end. An isolating ring 202 is arranged inside the mixing tank 201. A funnel 203 is installed on the inner side surface of the isolating ring 202. The isolating ring 202 and the funnel 203 cooperate to divide the inside of the mixing tank 201 into upper and lower two chambers, and different temperatures are set in the two chambers. The upper chamber is at the sand mixing adaptation temperature for mixing, and the lower chamber is at room temperature for cooling. The funnel 203 facilitates the coated sand in the upper chamber to enter the lower chamber.

[0044] As Figure 2 and Figure 3 shown, a shaft rod 204 is rotatably arranged together in the lower funnel tube of the mixing tank 201 and the funnel 203. A number of uniformly distributed stirring blades 207 are installed on the side surface of the shaft rod 204. A lower plate 211 is arranged below the mixing tank 201. A stirring motor with a driving end connected to the lower end of the shaft rod 204 is installed on the lower side of the lower plate 211. The stirring motor operates to drive the shaft rod 204 to rotate, and the rotating shaft rod 204 drives all the stirring blades 207 to rotate, respectively stirring the coated sand in the upper and lower chambers.

[0045] As Figure 2 and Figure 3As shown, on the surface of the shaft rod 204 above the funnel 203, an upper sealing cover 208 for closing its port is installed. On the lower side of the mixing tank 201, a material transfer electric cylinder 212 connected to the lower plate 211 is symmetrically installed. When the material transfer electric cylinder 212 shortens, it drives the lower plate 211 and the shaft rod 204 to rise, and also drives the upper sealing cover 208 to rise to open the port of the funnel 203. When the material transfer electric cylinder 212 shortens, the upper sealing cover 208 is re-covered on the upper port of the funnel 203 to close it.

[0046] As Figure 2 and Figure 3 shown, an upper auger 206 and a lower auger 205 are respectively arranged in the funnel tube of the funnel 203 and the funnel tube of the mixing tank 201 on the shaft rod 204. A discharge pipe 213 is installed at the lower end of the funnel tube of the mixing tank 201. When the shaft rod 204 rotates, it drives the upper auger 206 to rotate. Through the rotating upper auger 206, the coated sand quickly enters the lower cavity through the funnel 203, and the rotating lower auger 205 can discharge the coated sand cooled in the lower cavity from the discharge pipe 213.

[0047] As Figure 2 and Figure 3 shown, a rotating plate 214 is rotatably installed at the center of the upper end of the mixing tank 201. A feeding pipe 215 is installed on the rotating plate 214. A sealing cover 216 is arranged at the upper port of the feeding pipe 215. Open the sealing cover 216, put the heated quartz sand into the mixing tank 201, and then send the melted resin and other mixture of mixing agents into the mixing tank 201 through the feeding pipe 215, and then cover the sealing cover 216.

[0048] As Figure 2 and Figure 3 shown, a lower sealing cover 209 for closing the funnel port below the mixing tank 201 is slidably arranged on the shaft rod 204. A discharge electric cylinder 210 with a telescopic arm extending into the mixing tank 201 and connected to the lower sealing cover 209 is installed on the lower side of the mixing tank 201. When the discharge electric cylinder 210 extends, it drives the lower sealing cover 209 to rise to open the funnel port below the mixing tank 201 for convenient discharging. After discharging is completed, the discharge electric cylinder 210 shortens to drive the lower sealing cover 209 to re-cover on the funnel below the mixing tank 201.

[0049] In summary, open the sealing cover 216, put the heated quartz sand into the mixing tank 201, and then send the resin mixture formed by the melted resin and other mixing agents into the mixing tank 201 through the feeding pipe 215, and then cover the sealing cover 216. The stirring motor operates to drive the shaft rod 204 to rotate. The rotating shaft rod 204 drives all the stirring blades 207 to rotate, respectively stirring the quartz sand and the resin mixture in the upper cavity to make them evenly mixed and form coated sand.

[0050] When the transfer electric cylinder 212 shortens, it drives the lower plate 211 and the shaft rod 204 to rise, drives the upper sealing cover 208 to rise to open the port of the funnel 203, and the shaft rod 204 continues to rotate to drive the upper auger 206 to rotate. Through the rotating upper auger 206, the coated sand quickly passes through the funnel 203 and enters the lower cavity. Then, the transfer electric cylinder 212 extends to drive the upper sealing cover 208 to descend and cover the funnel 203 to seal it. After that, the upper cavity conducts the next mixing. At the same time, the rotating shaft rod 204 will also stir the coated sand that is cooling in the lower cavity to prevent it from caking.

[0051] When the coated sand in the lower cavity is cooled, the discharging electric cylinder 210 extends to drive the lower sealing cover 209 to rise to open the funnel below the mixing tank 201. Then, the rotating shaft rod 204 drives the lower auger 205 to rotate to discharge the coated sand in the lower cavity from the discharging pipe 213, realizing discharging.

[0052] As Figure 1 shown, a rotating motor 10 with a driving end connected to the rotating shaft of the mixing tank 201 is installed on the side of one of the rotating seats 9. On the upper side of the base 1 and on one side of the stirring mechanism 2, a support seat 11 adapted to the mixing tank 201 is installed. The operating rotating seat 9 drives the mixing tank 201 to rotate by ninety degrees to make it lie down, and uses the support seat 11 to support it.

[0053] As Figure 4 and Figure 5 shown, a fixed disk 12 is installed at the end of the other rotating shaft of the mixing tank 201. A number of uniformly distributed jacks 13 are opened on the side of the fixed disk 12. A fixed cylinder 14 is installed on the side of the rotating seat 9 on the same side as the fixed disk 12. A pin 15 extending into one of the jacks 13 is installed at the end of the fixed cylinder 14.

[0054] Before the mixing tank 201 rotates, the fixed cylinder 14 shortens to drive the pin 15 to move out of the inserted jack 13 to release the fixation. After that, after the mixing tank 201 rotates, the fixed cylinder 14 extends to drive the pin 15 to re-insert into the aligned jack 13 to enhance the stability of the mixing tank 201.

[0055] As Figure 3 、 Figure 6 and Figure 7 shown, a screening mechanism 3 is further included. The screening mechanism 3 includes a plurality of arc-shaped frames 301 distributed in a ring and having upper ends connected to the rotating plate 214. A sieve cylinder 302 is commonly installed inside all the arc-shaped frames 301. The sieve cylinder 302 is connected to the rotating plate 214 through the arc-shaped frames 301. Then, the rotating rotating plate 214 can drive the sieve cylinder 302 to rotate to make the coated sand tumble in the sieve cylinder 302 and filter it at the same time. The small-particle coated sand leaks out from the sieve holes to realize screening.

[0056] As Figure 6 andFigure 7 As shown, above the rotating plate 214, there is an iron plate 303 that slides up and down. On the surface of the iron plate 303, a rectangular groove 308 adapted to the feed pipe 215 is opened directly above it. Between two adjacent arc-shaped frames 301, there is an arc-shaped plate 304 that covers the side of the sieve cylinder 302 and whose upper end is connected to the iron plate 303. The moving iron plate 303 drives all the arc-shaped plates 304 to rise, so that the area of the sieve cylinder 302 covered by the arc-shaped plates 304 is opened. At the same time, the gap between the sieve cylinder 302 and the rotating plate 214 can also be closed by the arc-shaped plate 304.

[0057] As Figure 6 and Figure 7 shown, a toothed ring 309 is installed outside the rotating plate 214, and a screening motor 306 is installed on the side of the mixing tank 201. A gear 307 meshing with the toothed ring 309 is installed at the driving end of the screening motor 306. The operating screening motor 306 drives the gear 307 to rotate, and the rotating gear 307 drives the rotating plate 214 to rotate through the toothed ring 309.

[0058] In summary, as Figure 8 shown, when the coated sand is formed by mixing, the rotating base 9 drives the mixing tank 201 to rotate by ninety degrees so that it lies down on the support base 11. Then, the moving iron plate 303 drives all the arc-shaped plates 304 to rise, so that the area of the sieve cylinder 302 covered by the arc-shaped plates 304 is opened. At the same time, the gap between the sieve cylinder 302 and the rotating plate 214 can also be closed by the arc-shaped plate 304. The operating screening motor 306 drives the gear 307 to rotate, and the rotating gear 307 drives the rotating plate 214 to rotate through the toothed ring 309. The rotating rotating plate 214 drives the horizontally placed sieve cylinder 302, iron plate 303, and all arc-shaped plates 304 to rotate, so that the coated sand tumbles in the sieve cylinder 302 and is filtered at the same time. The small-particle coated sand leaks out from the sieve holes to achieve screening. After the screening is completed, the iron plate 303 descends, driving all the arc-shaped plates 304 to descend to cover the side of the sieve cylinder 302 again, and the rotating base 9 drives the mixing tank 201 to reverse by ninety degrees to restore its position.

[0059] As Figure 5 and Figure 9 shown, a cross plate 6 is provided directly above the iron plate 303. A main electromagnet 7 is rotatably installed at the center of the lower side of the cross plate 6. A lifting mechanism 5 is provided on the cross plate 6. When the main electromagnet 7 is energized to magnetically attract the iron plate 303, then the cross plate 6 and the main electromagnet 7 are driven to rise or fall by the lifting mechanism 5.

[0060] As Figure 10As shown in the figure, the lifting mechanism 5 includes a U-shaped frame 501 installed on the rotating plate 214. A threaded cylinder 502 is rotatably installed at the center of the upper side of the U-shaped frame 501. A screw rod 503 that is adapted to the threaded hole of the threaded cylinder 502 and whose lower end is connected to the cross plate 6 is provided in the threaded hole of the threaded cylinder 502. A limiting rod 507 that penetrates through the U-shaped frame 501 and is slidably connected thereto is also installed on the cross plate 6. Since the limiting rod 507 on the cross plate 6 is slidably connected to the U-shaped frame 501, the screw rod 503 is prevented from rotating on its own. At the same time, when the threaded cylinder 502 rotates, the screw rod 503 is driven to rise, driving the cross plate 6 and the main electromagnet 7 to rise. When the threaded cylinder 502 rotates in reverse, the cross plate 6 and the main electromagnet 7 are lowered.

[0061] As Figure 10 shown in the figure, a lifting motor 504 is installed on the upper side of the U-shaped frame 501 on one side of the threaded cylinder 502. A main bevel gear 505 is installed at the driving end of the lifting motor 504. A secondary bevel gear 506 that meshes with the main bevel gear 505 is installed on the side surface of the threaded cylinder 502. The operating lifting motor 504 drives the main bevel gear 505 to rotate. The rotating main bevel gear 505 drives the threaded cylinder 502 to rotate through the secondary bevel gear 506. When the lifting motor 504 drives the main bevel gear 505 to rotate in reverse, the threaded cylinder 502 will also be driven to rotate in reverse.

[0062] In summary, the operating lifting motor 504 drives the main bevel gear 505 to rotate. The rotating main bevel gear 505 drives the threaded cylinder 502 to rotate through the secondary bevel gear 506. When the threaded cylinder 502 rotates, the screw rod 503 is driven to rise, driving the cross plate 6 and the main electromagnet 7 to rise. When the lifting motor 504 drives the main bevel gear 505 to rotate in reverse, the threaded cylinder 502 will also be driven to rotate in reverse, causing the cross plate 6 and the main electromagnet 7 to lower.

[0063] As Figure 3 、 Figure 7 and Figure 11 shown in the figure, an opening 305 is provided on the side surface of the arc-shaped plate 304 above the sieve cylinder 302. A material return mechanism 4 is also provided. The material return mechanism 4 includes a material lifting ring 401 located outside all the arc-shaped plates 304 and whose upper surface is inclined inward. When the large-particle coated sand in the sieve cylinder 302 is discharged into the lower cavity, the material lifting ring 401 is lifted, driving the small-particle coated sand outside the sieve cylinder 302 to rise. Until the material lifting ring 401 is at the lower edge of the opening 305, the small-particle coated sand above it will enter the sieve cylinder 302 from the opening 305 and the gap between the sieve cylinder 302 and the rotating plate 214. At the same time, the upper side of the material lifting ring 401 is inclined inward, and there will be no residue of coated sand.

[0064] As Figure 3 、 Figure 9 and Figure 11As shown in the figure, multiple vertical rods 402 are symmetrically installed on the upper side of the material lifting ring 401. The upper ends of the vertical rods 402 extend to the outside of the material lifting ring 401 and iron blocks 403 are installed. On the lower side of the cross plate 6, auxiliary electromagnets 8 are installed above each iron block 403. When the main electromagnet 7 is de-energized and the auxiliary electromagnet 8 is energized, the auxiliary electromagnet 8 magnetically attracts the iron block 403. Then, the cross plate 6 is lifted by the lifting mechanism 5, and the material lifting ring 401 can be driven to rise through the auxiliary electromagnet 8, the vertical rod 402, and the iron block 403.

[0065] Embodiment 2: On the basis of Embodiment 1, as Figure 11 and Figure 12 shown in the figure, a fixed seat 405 is installed on the upper side of the mixing tank 201 on one side of the iron block 403. A trapezoidal block 406 with an upward slope is slidably arranged inside the fixed seat 405. A spring 407 is arranged on one side of the trapezoidal block 406. A limiting plate 409 is installed inside the fixed seat 405 on the surface of the extrusion block 408. When the auxiliary electromagnet 8 descends and contacts the iron block 403, it will also press down the extrusion block 408, causing it to press the slope of the trapezoidal block 406, making the trapezoidal block 406 move towards the spring 407 and compress it. The limiting plate 409 is used to limit the extrusion block 408.

[0066] As Figure 12 shown in the figure, a card slot 404 is opened on the side of the iron block 403. An extrusion block 408 with an upper end extending outside the fixed seat 405 is arranged at the slope of the trapezoidal block 406. A clamping member 410 extending into the card slot 404 is installed on the side of the trapezoidal block 406. When the clamping member 410 is inserted into the card slot 404, the iron block 403 and the material lifting ring 401 are fixed. When the trapezoidal block 406 moves, it will also drive the clamping member 410 out of the card slot 404 to release the fixation of the iron block 403.

[0067] In summary, when the clamping member 410 is inserted into the card slot 404, the iron block 403 and the material lifting ring 401 are fixed, enhancing the stability of the material lifting ring 401. When the cross plate 6 descends and drives the auxiliary electromagnet 8 to cover the iron block 403, it will also press down the extrusion block 408, causing it to press the slope of the trapezoidal block 406, making the trapezoidal block 406 move towards the spring 407 and compress it. At the same time, it drives the clamping member 410 out of the card slot 404 to release the fixation of the material lifting ring 401. Then, the energized auxiliary electromagnet 8 magnetically attracts the iron block 403, and the rising auxiliary electromagnet 8 drives the material lifting ring 401 to rise. The vertical rod 402 is used to limit the clamping member 410. When the iron block 403 returns to its original position after descending, at this time, the card slot 404 is aligned with the clamping member 410. The power supply to the auxiliary electromagnet 8 is cut off. After the auxiliary electromagnet 8 rises, the spring 407 rebounds to drive the trapezoidal block 406 to return to its original position, thereby driving the clamping member 410 to be inserted into the card slot 404 to be fixed again.

[0068] The present application also discloses a method for uniformly mixing coated sand materials. The steps of this method are as follows: S1. Sand material mixing: Put the quartz sand and resin mixture into the stirring mechanism 2 and stir it to make it uniformly mixed to form coated sand. Specifically, open the sealing cover 216, put the heated quartz sand into the mixing tank 201, and then send the resin mixture formed by melting the resin and other admixtures into the mixing tank 201 through the feeding pipe 215. Then cover the sealing cover 216, and the stirring motor runs to drive the shaft rod 204 to rotate. The rotating shaft rod 204 drives all the stirring blades 207 to rotate, respectively stirring the quartz sand and resin mixture in the upper cavity to make it uniformly mixed and form coated sand.

[0069] S2. Structure deployment: Let the stirring mechanism 2 lie down and at the same time deploy the screening mechanism 3, and screen the coated sand in the screening cylinder 302. Specifically, the rotating seat 9 drives the mixing tank 201 to rotate 90 degrees so that it lies down on the support seat 11. The main electromagnet 7 is energized and magnetically attracted to the iron plate 303. The lifting mechanism 5 drives the main electromagnet 7 to move, and will also drive all the arc plates 304 to move through the iron plate 303, so that the area of the screening cylinder 302 covered by the arc plates 304 is opened. At the same time, the gap between the screening cylinder 302 and the rotating plate 214 can be closed by the arc plates 304. The running screening motor 306 drives the gear 307 to rotate. The rotating gear 307 drives the rotating plate 214 to rotate through the toothed ring 309. The rotating rotating plate 214 drives the horizontal screening cylinder 302, iron plate 303 and all arc plates 304 to rotate, so that the coated sand tumbles in the screening cylinder 302 and is filtered at the same time. The small-particle coated sand leaks out from the sieve holes to achieve screening. After the screening is completed, the iron plate 303 moves in the reverse direction, driving all the arc plates 304 to return to their original positions to cover the side of the screening cylinder 302 again. The rotating seat 9 drives the mixing tank 201 to reverse 90 degrees to restore its position. At this time, the large-particle coated sand is in the screening cylinder 302, and the small-particle coated sand is outside the screening cylinder 302.

[0070] S3. Sand material transfer: Send the large-particle coated sand in the upper cavity into the lower cavity for cooling. Specifically, when the transfer electric cylinder 212 shortens, it drives the lower plate 211 and the shaft rod 204 to rise, driving the upper sealing cover 208 to rise to open the port of the funnel 203. The shaft rod 204 continues to rotate to drive the upper auger 206 to rotate. Through the rotating upper auger 206, the coated sand quickly enters the lower cavity through the funnel 203. Then the transfer electric cylinder 212 extends to drive the upper sealing cover 208 to descend to cover the funnel 203 and seal it.

[0071] S4. Sand material return cylinder: Re-feed the small particle coated sand outside the screening cylinder 302 into the screening cylinder 302, and re-add the quartz sand and resin mixture to continue mixing. Specifically, cut off the power supply of the main electromagnet 7 and turn on the power supply of the auxiliary electromagnet 8 at the same time, so that the auxiliary electromagnet 8 magnetically attracts the iron block 403. Then, use the lifting mechanism 5 to raise the cross plate 6, and drive the lifting ring 401 to rise through the auxiliary electromagnet 8, the iron block 403 and the vertical rod 402, driving the small particle coated sand outside the screening cylinder 302 to rise. When the lifting ring 401 reaches the lower edge of the opening 305, the small particle coated sand above it will enter the screening cylinder 302 through the opening 305 and the gap between the screening cylinder 302 and the rotating plate 214. Then, re-add the quartz sand and resin mixture to the mixing tank 201 through S1 and mix them. While the resin mixture adheres to the surface of the quartz sand to form coated sand, the resin mixture will also continue to adhere to the surface of the small particle coated sand to form large particle coated sand.

[0072] S5. Sand material discharge: Discharge the coated sand that has been cooled in the lower cavity. Specifically, during the stirring process of the quartz sand and resin mixture in S4, the rotating shaft rod 204 stirs the large particle coated sand in the lower cavity of the mixing tank 201 to prevent it from caking. When the mixing in the upper cavity is completed, the large particle coated sand in the lower cavity is also cooled. The discharging electric cylinder 210 extends to drive the lower sealing cover 209 to rise, opening the funnel below the mixing tank 201. Then, the rotating shaft rod 204 drives the lower auger 205 to rotate, discharging the coated sand in the lower cavity from the discharging pipe 213 to achieve discharging. Then, start repeating the operation from S2 to achieve continuous mixing and generation.

[0073] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting.

[0074] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard 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 device for uniformly mixing coated sand materials, comprising a base, on the upper side of which two rotating seats are symmetrically installed. It is characterized in that: A stirring mechanism is rotatably installed between the two rotating seats. The stirring mechanism includes a mixing tank with a funnel-shaped lower end. An isolating ring is arranged inside the mixing tank. A funnel is installed on the inner side surface of the isolating ring. A shaft rod is jointly rotatably arranged in the lower funnel tube of the funnel and the funnel tube of the mixing tank. An upper auger and a lower auger are respectively arranged on the shaft rod in the funnel tube of the funnel and the funnel tube of the mixing tank. A number of uniformly distributed stirring blades are installed on the side surface of the shaft rod; A rotating plate is rotatably installed at the center of the upper end of the mixing tank. A screening mechanism is also included. The screening mechanism includes a plurality of arc-shaped frames distributed in a ring shape and connected to the rotating plate at the upper ends. A sieve cylinder is jointly installed on the inner sides of all the arc-shaped frames. An iron plate that slides up and down is arranged above the rotating plate. An arc-shaped plate connected to the iron plate is arranged between two adjacent arc-shaped frames. An opening is formed on the side surface of the arc-shaped plate above the sieve cylinder; A material returning mechanism is also provided. The material returning mechanism includes a material lifting ring located outside all the arc-shaped plates and with an inwardly inclined upper surface.

2. The uniform mixing device for coated sand materials according to claim 1, wherein: An upper sealing cover for closing its port is installed on the surface of the shaft rod above the funnel. On the lower side of the mixing tank, two material transfer electric cylinders connected to the shaft rod are symmetrically installed.

3. The uniform mixing device for coated sand materials according to claim 2, wherein: A lower sealing cover for closing the lower funnel port of the mixing tank is slidably arranged on the shaft rod. On the lower side of the mixing tank, a discharging electric cylinder with a telescopic arm extending into the mixing tank and connected to the lower sealing cover is installed.

4. A device for uniformly mixing coated sand materials according to claim 3, characterized in that: A toothed ring is installed on the outer side of the rotating plate. A screening motor is installed on the side surface of the mixing tank. A gear meshing with the toothed ring is installed at the driving end of the screening motor.

5. The uniform mixing device for coated sand materials according to claim 4, wherein: A plurality of vertical rods are symmetrically installed on the upper side of the material lifting ring. The upper ends of the vertical rods extend to the outside of the material lifting ring and are installed with iron blocks. A clamping groove is formed on the side surface of the iron block.

6. The uniform mixing device for coated sand materials according to claim 5, characterized in that: A fixing seat is installed on the upper side of the mixing tank on one side of the iron block. A trapezoidal block with an upward inclined surface is slidably arranged inside the fixing seat. A spring is arranged on one side of the trapezoidal block.

7. The uniform mixing device for coated sand materials according to claim 6, wherein: An extrusion block with an upper end extending outside the fixing seat is arranged at the inclined surface of the trapezoidal block. A clamping part extending into the clamping groove is installed on the side surface of the trapezoidal block.

8. A uniform mixing device for coated sand materials according to claim 7, characterized in that: A cross plate is arranged directly above the iron plate. A main electromagnet is rotatably installed at the center of the lower side of the cross plate. A sub-electromagnet is installed above each iron block on the lower side of the cross plate. A lifting mechanism is arranged on the cross plate, and the lifting mechanism drives the cross plate to move up and down.

9. A device for uniformly mixing coated sand materials according to claim 8, characterized in that: A rotating motor with a driving end connected to the rotating shaft of the mixing tank is installed on the side surface of one of the rotating seats. On the upper side of the base, a support seat adapted to the mixing tank is installed on one side of the stirring mechanism.

10. A method for uniformly mixing coated sand materials, comprising a device for uniformly mixing coated sand materials according to any one of claims 1 to 9, characterized in that: The method includes the following steps: S1. Sand material mixing: Put quartz sand and resin mixture into the stirring mechanism and stir it to make it uniformly mixed to form coated sand; S2. Structure unfolding: Let the stirring mechanism lie down and at the same time unfold the structure of the screening mechanism, and screen the coated sand in the sieve cylinder; S3. Sand material transfer: Send the large-particle coated sand in the upper cavity into the lower cavity for cooling; S4. Sand material returning to the cylinder: Send the small-particle coated sand outside the sieve cylinder back into the sieve cylinder, and add quartz sand and resin mixture again to continue mixing; S5. Sand material discharging: Discharge the cooled coated sand in the lower cavity.

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