Production device and method of zirconium powder special for precision casting

Abstract

The application discloses a production device and method of zirconium powder special for precision casting, and belongs to the field of zirconium powder processing. The production device of zirconium powder special for precision casting comprises a bottom support, a rotatable grinding barrel and a driving gear fixedly arranged on the grinding barrel, and further comprises a fixed shaft arranged in the grinding barrel, and a plurality of collecting parts arranged on the fixed shaft, wherein one end of the fixed shaft is provided with an adjusting part for adjusting the position of the collecting part; when the collecting part is located on one side of the rotating direction of the grinding barrel, the collecting part is used for collecting a fixed amount of large grinding balls; after a certain time of processing, the collecting part is used for collecting part of the large grinding balls, so that the large grinding balls are prevented from participating in grinding again, thereby preventing the zirconium powder from being excessively fine to a certain extent, the good compactness characteristics of the 325-mesh zirconium powder can be ensured, and the problem that the large grinding balls cause the aluminum ball to be excessively worn due to air impact and bring in a large amount of wear particles can be avoided.

Description

Technical Field

[0001] This invention relates to the field of zircon powder processing technology, and in particular to a production apparatus and method for precision casting zircon powder. Background Technology

[0002] Zircon powder, as an industrial material, is widely used in mold coatings and ceramic cores in precision casting (mainly silica sol investment casting). In the ceramics industry, it can be used for glazing, increasing the wear resistance and surface smoothness of the finished ceramics. Furthermore, it has specialized applications in other chemical industries, particularly in the production of various building ceramics, daily-use ceramics, sanitary ceramics, and craft ceramics. This wide applicability of zircon powder stems primarily from its high refractoriness and good chemical stability, a key factor determining the quality of the final casting in precision casting. Therefore, the chemical composition of zircon powder requires ZrO2+HfO2 > 65%, SiO2 < 3%, Fe2O3 < 0.5%, TiO2 < 0.4%, P2O5 < 0.5%, and Al2O3 < 0.3% to ensure its refractoriness and stability.

[0003] When producing zircon powder for precision casting, a ball mill is needed to grind the zircon sand to achieve a suitable particle size range.

[0004] Currently, the grinding of zircon sand involves adding a specified proportion of aluminum balls and grinding aids. The impact and grinding action generated by the rotating grinding balls within the drum achieves the crushing and refining of the zircon sand. Large grinding balls primarily perform coarse crushing, using significant impact force to break lumpy or coarse-grained zircon sand to a medium particle size. Small grinding balls fill the gaps between the large grinding balls, increasing the material contact area and achieving fine grinding of medium and fine particles. Both types work together to complete the grinding process across the entire particle size range, with both large and small grinding balls participating throughout the entire process. While the initial coarse grinding stage relies on the high impact force of the large grinding balls for efficient crushing, continued participation of large grinding balls in the later fine grinding stage can easily lead to excessive refinement of some zircon powder (increasing the proportion of overly fine powder). This not only destroys the necessary density of the zircon powder but also reduces the permeability of the mold shell. Furthermore, shortening the grinding time to avoid overly fine powder results in an increased amount of coarse particles remaining, leading to a higher sieve residue, which fails to meet the particle size uniformity requirements for mold shell forming, thus affecting the surface finish of the casting. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a production device for precision casting zircon powder that can overcome or at least partially solve the above problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A production apparatus for zircon powder for precision casting includes: a bottom support, a rotatable grinding barrel, and a drive gear fixedly mounted on the grinding barrel; a fixed shaft disposed inside the grinding barrel; and multiple collection parts disposed on the fixed shaft, wherein one end of the fixed shaft is provided with an adjustment part for adjusting the position of the collection parts, and when the collection parts are located on one side of the rotation direction of the grinding barrel, the collection parts are used to collect a fixed amount of large grinding balls.

[0007] In a preferred embodiment of the present invention, bearing seats are symmetrically arranged on the bottom support, one end of the grinding barrel is provided with a feed end cover and a feed pipe, and the other end is provided with a discharge end cover and a discharge pipe. The discharge pipe and the feed pipe are both mounted in the bearing seats, and an inspection section is provided on the outside of the grinding barrel.

[0008] In a preferred embodiment of the present invention, the adjusting part includes a plurality of limiting parts disposed at the end of the fixed shaft, a locking block is slidably disposed on the limiting part, positioning plates are symmetrically disposed on both sides of the bearing holder, the end of the locking block is placed between the two positioning plates, a threaded rod is fixedly connected to one end of the fixed shaft near the locking block, a nut is threadedly connected to the threaded rod, a support frame is symmetrically disposed inside the grinding barrel, a sealed bearing coaxially disposed with the grinding barrel is fixedly connected to the support frame, and the fixed shaft is placed inside the sealed bearing.

[0009] In a preferred embodiment of the present invention, the inner wall of the grinding barrel is detachably connected with a plurality of liners, the middle of the liners is provided with a first peak, and the two sides of the first peak are provided with troughs.

[0010] In a preferred embodiment of the present invention, the liner is provided with a plurality of liner platforms, the liner platforms are provided with a second peak at the first peak, and the liner platforms are provided with a support surface between the troughs on the side of the grinding barrel near the rotation direction.

[0011] In a preferred embodiment of the present invention, a guide surface is provided on the side of the liner away from the supporting surface.

[0012] In a preferred embodiment of the present invention, a flow guiding interval is provided between two adjacent liner platforms, wherein the width of the flow guiding interval at the support surface is smaller than the diameter of the large grinding ball and larger than the diameter of the small grinding ball.

[0013] In a preferred embodiment of the present invention, a grinding zone is provided between two adjacent sets of liner plates, and a grinding surface is provided on the side of the liner plate closest to the grinding zone.

[0014] In a preferred embodiment of the present invention, the collecting part includes multiple sets of collecting areas mounted on a fixed shaft. Each collecting area includes two collecting rods. The outer walls of the two collecting rods are respectively fixedly connected to first guide strips that are close to each other. The distance between the two first guide strips is smaller than the diameter of the large grinding ball. Buffer rods are symmetrically arranged between the two collecting areas. Second guide strips are fixedly connected to each of the two buffer rods. A drop area is provided between one end of the buffer rod and the fixed shaft. A drop gap is provided between the buffer rod and the collecting rod.

[0015] A method for producing zircon powder for precision casting mainly includes the following steps: Step 1: Add the specified proportions and diameters of grinding balls, grinding aids, and zircon sand into the grinding barrel; Step 2: Coarse grinding and crushing are achieved by rotating the grinding drum; Step 3: After processing for a certain period of time, rotate the fixed shaft to a certain angle and fix it. At this time, the collection section collects some of the large grinding balls. Step 4: Grind the remaining small amount of large and small grinding balls.

[0016] Compared with the prior art, the present invention provides a production apparatus for zircon powder for precision casting, which has the following beneficial effects: 1. This production device for precision casting zircon powder uses large grinding balls for coarse grinding. The large grinding balls provide a certain impact force to crush the zircon sand. After a certain period of time, the zircon sand reaches a certain particle size standard. Then, the machine is stopped for a short time, the nut is turned, the clamping block is pulled outward, and the fixed shaft is rotated at a certain angle in a specified direction. The fixed shaft is then limited by the nut, clamping block, and positioning plate. At this time, the large grinding balls thrown up by the rotation of the grinding barrel fall to the collection section, and some of the large grinding balls are collected to prevent them from participating in the grinding again. This can prevent the grinding of zircon powder from being too fine and excessive to a certain extent.

[0017] 2. This precision casting zircon powder production device uses a small number of large grinding balls for grinding, which can achieve fine grinding by increasing the grinding time, avoiding excessive sieve residue and improving the overall grinding quality. In addition, it can also ensure that the zircon powder retains the good density characteristics of 325 mesh zircon powder, and better guarantee the refractory strength and air permeability of large casting shells, improve the surface finish of large castings, and reduce some post-processing steps. To a certain extent, it reduces the production cost of precision casting enterprises, making the processed zircon powder more competitive in the market.

[0018] 3. The production device for zircon powder for precision casting can avoid the time spent removing large grinding balls midway, thus improving the overall processing efficiency. Furthermore, by collecting a portion of the large grinding balls, it can avoid the problem of excessive aluminum ball wear caused by the empty impact of the large grinding balls, as excessive aluminum content will affect the quality of the casting.

[0019] The parts not involved in this device are the same as or can be implemented using existing technology. After processing for a certain period of time, this invention collects some of the large grinding balls to prevent them from participating in grinding again. This can prevent excessively fine zircon powder from being ground, ensuring that the zircon powder retains the good compactness of 325 mesh zircon powder. At the same time, it can avoid the problem of excessive wear and tear on aluminum balls caused by the empty impact of large grinding balls. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 2 For the present invention Figure 1 Enlarged view of point A in the middle; Figure 3 This is a schematic diagram of the structure of the present invention. Figure 2 ; Figure 4 This is the front view of the present invention; Figure 5 This is the left view of the present invention; Figure 6 This is a right view of the present invention; Figure 7 This is a cross-sectional view of the present invention. Figure 1 ; Figure 8 This is a cross-sectional view of the present invention. Figure 2 ; Figure 9 This is a cross-sectional view of the present invention. Figure 3 ; Figure 10 This is a schematic diagram of the collecting part in this invention; Figure 11 For the present invention Figure 10 Enlarged view of point B in the middle; Figure 12 This is a schematic diagram of the liner plate in the present invention. Figure 1 ; Figure 13 This is a schematic diagram of the liner plate in the present invention. Figure 2 ; Figure 14 This is a schematic diagram of the liner plate in the present invention. Figure 3 ; Figure 15 This is a schematic diagram of the liner plate in the present invention. Figure 4 .

[0021] In the diagram: 1. Bottom support; 101. Bearing holder; 2. Grinding barrel; 201. Feed end cover; 202. Feed pipe; 203. Discharge end cover; 204. Discharge pipe; 205. Inspection section; 206. Drive gear; 3. Support frame; 301. Sealed bearing; 302. Fixed shaft; 303. Limiting part; 304. Threaded rod; 305. Clamping block; 306. Nut; 307. Positioning plate; 4. Receiving... 401. Collection area; 402. Collection rod; 403. First guide bar; 404. Buffer bar; 405. Drop gap; 406. Second guide bar; 407. Drop area; 5. Liner plate; 501. First crest; 502. trough; 6. Liner platform; 601. Second crest; 602. Lifting surface; 603. Guide surface; 604. Guide interval; 605. Grinding surface; 606. Grinding area. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] Example: Reference Figure 1 , Figure 7 and Figure 10 A production apparatus for precision casting zircon powder includes: a bottom support 1, a rotatable grinding barrel 2, and a drive gear 206 fixedly mounted on the grinding barrel 2. The drive gear 206 cooperates with a separate drive mechanism to rotate the grinding barrel 2. The external drive mechanism is a combination of a motor, a gearbox, and gears. The apparatus also includes: Reference Figures 3-6 The bottom support 1 is symmetrically provided with bearing holders 101. One end of the grinding barrel 2 is provided with a feed end cover 201 and a feed pipe 202, and the other end is provided with a discharge end cover 203 and a discharge pipe 204. The discharge pipe 204 and the feed pipe 202 are both mounted in the bearing holders 101. The outside of the grinding barrel 2 is provided with a maintenance section 205. Currently, when processing zircon powder, it is necessary to grind it. During the grinding process, a certain amount of zircon sand needs to be added, along with grinding balls and grinding aids in a certain proportion, before grinding. Grinding balls are divided into large grinding balls and small grinding balls. Large grinding balls are mainly responsible for providing greater impact force, while small grinding balls are mainly responsible for fine grinding. During the entire grinding process, small grinding balls can fill the gaps between large grinding balls, increasing the grinding contact area and finely grinding medium and small particles. Large grinding balls can be responsible for crushing coarse zircon sand. They work together, but this grinding method will result in some fine sand that does not meet the diameter requirement after grinding, and it also has a high sieve residue.

[0024] To address the problems that may arise in current zircon sand grinding, the following implementation methods can be adopted, wherein, in specific implementation methods, refer to... Figure 2 and Figure 11 A fixed shaft 302 is installed inside the grinding barrel 2; multiple collection parts 4 are installed on the fixed shaft 302, wherein one end of the fixed shaft 302 is provided with an adjustment part for adjusting the position of the collection parts 4. When the collection parts 4 are located on one side of the rotation direction of the grinding barrel 2, the collection parts 4 are used to collect a certain amount of large grinding balls.

[0025] Reference Figure 2 The adjustment part includes multiple limiting parts 303 set at the end of the fixed shaft 302. A locking block 305 is slidably set on the limiting part 303. Positioning plates 307 are symmetrically arranged on both sides of the bearing seat 101. The end of the locking block 305 is placed between the two positioning plates 307. A threaded rod 304 is fixedly connected to one end of the fixed shaft 302 near the locking block 305. A nut 306 is threadedly connected to the threaded rod 304. A support frame 3 is symmetrically arranged inside the grinding barrel 2. A sealed bearing 301 coaxially arranged with the grinding barrel 2 is fixedly connected to the support frame 3. The fixed shaft 302 is placed inside the sealed bearing 301.

[0026] During the grinding process, large and small grinding balls in a specified ratio are added first. After they are completely added, the equipment is started for coarse grinding. During coarse grinding, the large grinding balls provide impact force to crush the zircon sand. After a certain time, the sand reaches a certain particle size standard. Then, the machine is stopped briefly, and the nut 306 is rotated to pull the locking block 305 outward. The fixed shaft 302 is rotated a certain angle in a specified direction. The fixed shaft 302 is then limited by the nut 306, locking block 305, and positioning plate 307. At this time, the large grinding balls thrown up by the rotation of the grinding barrel 2 fall to the collection section 4. Some of the large grinding balls... Collecting the zircon powder prevents large grinding balls from participating in the grinding process again, thus preventing excessive fine powder from being produced. Furthermore, using a small number of large grinding balls allows for finer grinding by increasing the grinding time, avoiding excessive residue and improving overall grinding quality. This also ensures the zircon powder retains the good density properties of 325-mesh zircon powder, better guaranteeing the refractory strength and permeability of large casting shells, improving the surface finish of large castings, and reducing post-processing steps. This reduces production costs for precision casting companies and gives the processed zircon powder a competitive edge in the market.

[0027] On the other hand, this method can avoid the time spent removing large grinding balls midway, improving overall processing efficiency. Furthermore, by collecting some of the large grinding balls, it can prevent the problem of excessive aluminum ball wear caused by the empty impact of the large grinding balls, as excessive aluminum content will affect the quality of the casting.

[0028] In another embodiment, to avoid wear on the grinding barrel 2, the following embodiment can also be adopted, see reference. Figures 7-9 The inner wall of the grinding barrel 2 is detachably connected with multiple liner plates 5, as shown in the reference. Figures 12-15 The liner 5 has a first peak 501 in the middle and a trough 502 on both sides of the first peak 501.

[0029] The liner 5 can withstand wear and tear, preventing damage to the grinding barrel 2. In addition, it is detachably connected by bolts for easy replacement later. The first peak 501 has a higher lifting effect, allowing the grinding balls to be thrown up to a certain height, meeting the crushing requirements of medium and large particles. The trough 502 can accommodate small balls and fine materials, increasing the contact frequency between small grinding balls and materials, and improving the fine grinding effect. Combined with the method of removing large balls midway, it can improve the overall particle size distribution of zircon powder.

[0030] In a further implementation, the following implementation method may be adopted, with reference to... Figures 12-15The liner plate 5 is provided with multiple sets of liner platforms 6. The liner platform 6 is located at the first wave peak 501 and has a second wave peak 601. The liner platform 6 is provided with a support surface 602 between the wave troughs 502 on the side of the grinding barrel 2 near the rotation direction.

[0031] Among them, the lifting surface 602 can improve the lifting effect of a small number of grinding balls, ensuring the initial coarse grinding effect; A guide surface 603 is provided on the side of the liner 6 away from the support surface 602.

[0032] The guide surface 603 is designed to facilitate the rolling of the grinding balls, improve their grinding effect, and enhance the rolling effect of the grinding balls.

[0033] In a preferred embodiment, refer to Figures 12-15 A flow guide section 604 is provided between two adjacent liner platforms 6. The width of the flow guide section 604 at the support surface 602 is smaller than the diameter of the large grinding ball and larger than the diameter of the small grinding ball.

[0034] Let the surface formed between the guide section 604 and the support surface 602 be the support surface, and the width of the support surface near the second peak 601 is smaller than the width near the trough 502.

[0035] After setting the flow guide section 604, by matching the width of the support surface with the diameter of the grinding ball, only the large grinding ball can be lifted high, which can ensure the coarse grinding effect in the early stage. At the same time, in the middle and later stages, a small number of large grinding balls can be used to crush the residual large zircon sand particles and improve the overall grinding efficiency. The sidewalls of the flow guide section 604 are inclined to ensure that the grinding balls can roll and shift or move within the flow guide section 604 to achieve thorough grinding, and can also grind zircon powder by contacting the liner 6.

[0036] A grinding area 606 is provided between two adjacent sets of liner 6, and a grinding surface 605 is provided on the side of the liner 6 near the grinding area 606.

[0037] The grinding surfaces 605 are inclined. When the two grinding surfaces 605 are inclined, the distance between the feed point and the discharge point of the grinding zone 606 is different. This causes the grinding balls to be misaligned and displaced when they roll in the grinding zone 606, which improves the efficiency of grinding zircon powder and allows for thorough grinding of the zircon powder.

[0038] To collect large grinding balls, the following implementation method can be used, as described below. Figure 11The collecting part 4 includes multiple sets of collecting areas 401 mounted on the fixed shaft 302. Each collecting area 401 includes two collecting rods 402. The outer walls of the two collecting rods 402 are respectively fixedly connected with first guide bars 403 that are close to each other. The distance between the two first guide bars 403 is smaller than the diameter of the large grinding ball. The end of the collecting rod 402 away from the fixed shaft 302 is inclined upward. When the large grinding ball falls onto the two first guide bars 403, it has a certain buffering effect to prevent the large grinding ball from bouncing, thereby improving its collection effect. A buffer rod 404 is symmetrically arranged between two collection areas 401. A second guide bar 406 is fixedly connected to each of the two buffer rods 404. A drop area 407 is provided between one end of the buffer rod 404 and the fixed shaft 302. A drop gap 405 is provided between the buffer rod 404 and the collection rod 402. In the later stages of grinding, some large grinding balls may fall onto the second guide bar 406. The second guide bar 406 guides them to flow to the other side, reducing the frequency of large grinding balls being thrown up. This effectively improves the quality of fine grinding in the later stages and allows for better control of the overall particle size distribution, resulting in better compactness.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A production apparatus for zircon powder specifically for precision casting, comprising: The bottom support (1), the rotatable grinding barrel (2), and the drive gear (206) fixedly mounted on the grinding barrel (2) are characterized in that they further include: A fixed shaft (302) is disposed inside the grinding barrel (2); Multiple collection parts (4) are provided on the fixed shaft (302), wherein one end of the fixed shaft (302) is provided with an adjustment part for adjusting the position of the collection parts (4). When the collection parts (4) are located on one side of the rotation direction of the grinding barrel (2), the collection parts (4) are used to collect a certain amount of large grinding balls. The bottom support (1) is symmetrically provided with bearing holders (101). One end of the grinding barrel (2) is provided with a feed end cover (201) and a feed pipe (202), and the other end is provided with a discharge end cover (203) and a discharge pipe (204). The discharge pipe (204) and the feed pipe (202) are both mounted in the bearing holders (101). The outside of the grinding barrel (2) is provided with a maintenance section (205). The adjustment part includes multiple limiting parts (303) set at the end of the fixed shaft (302). A locking block (305) is slidably set on the limiting part (303). Positioning plates (307) are symmetrically arranged on both sides of the bearing seat (101). The end of the locking block (305) is placed between the two positioning plates (307). A threaded rod (304) is fixedly connected to one end of the fixed shaft (302) near the locking block (305). A nut (306) is threadedly connected to the threaded rod (304). A support frame (3) is symmetrically arranged inside the grinding barrel (2). A sealed bearing (301) coaxially arranged with the grinding barrel (2) is fixedly connected to the support frame (3). The fixed shaft (302) is placed inside the sealed bearing (301).

2. The production apparatus for precision casting zircon powder according to claim 1, characterized in that, The grinding barrel (2) has multiple liner plates (5) detachably connected to its inner wall. The liner plate (5) has a first peak (501) in the middle and troughs (502) on both sides of the first peak (501).

3. The production apparatus for zircon powder for precision casting according to claim 2, characterized in that, The liner (5) is provided with multiple sets of liner platforms (6), and the liner platform (6) is provided with a second peak (601) at the first peak (501). The liner platform (6) is provided with a support surface (602) between the troughs (502) on the side of the grinding barrel (2) near the rotation direction.

4. The production apparatus for precision casting zircon powder according to claim 3, characterized in that, The liner (6) has a guide surface (603) on the side away from the support surface (602).

5. The production apparatus for precision casting zircon powder according to claim 3, characterized in that, A flow guide section (604) is provided between two adjacent liner platforms (6), wherein the width of the flow guide section (604) at the support surface (602) is smaller than the diameter of the large grinding ball and larger than the diameter of the small grinding ball.

6. The production apparatus for precision casting zircon powder according to claim 3, characterized in that, A grinding area (606) is provided between two adjacent sets of liner plates (6), and a grinding surface (605) is provided on the side of the liner plate (6) near the grinding area (606).

7. The production apparatus for precision casting zircon powder according to claim 3, characterized in that, The collecting part (4) includes multiple sets of collecting areas (401) installed on the fixed shaft (302). Each collecting area (401) includes two collecting rods (402). The outer walls of the two collecting rods (402) are respectively fixedly connected with first guide strips (403) that are close to each other. The distance between the two first guide strips (403) is smaller than the diameter of the large grinding ball. Buffer rods (404) are symmetrically arranged between the two collecting areas (401). A second guide strip (406) is fixedly connected to each of the two buffer rods (404). A drop area (407) is provided between one end of the buffer rod (404) and the fixed shaft (302). A drop gap (405) is provided between the buffer rod (404) and the collecting rod (402).

8. A method for producing zircon powder for precision casting, using the production apparatus for zircon powder for precision casting as described in claim 1, characterized in that, The main steps include: Step 1: Add the specified proportions and diameters of grinding balls, grinding aids, and zircon sand into the grinding bucket (2); Step 2: Coarse grinding and crushing are achieved by rotating the grinding barrel (2); Step 3: After processing for a certain period of time, rotate the fixed shaft (302) by a certain angle and fix it. At this time, the collection part (4) collects some of the large grinding balls. Step 4: Grind the remaining small amount of large and small grinding balls.

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