Eggshell powder crushing device and preparation process of fine eggshell powder

Abstract

The invention discloses an eggshell powder crushing device and a preparation process of fine eggshell powder, and relates to the technical field of eggshell powder production. The motor is mounted at the top of the barrel body; the first rotating rod is fixedly arranged at the bottom end of a rotating shaft of the motor; the first grinder is fixedly arranged on the circumferential outer wall of the first rotating rod; the first bracket is fixedly arranged on the inner wall of the barrel body and is used for supporting the first grinder; the filter screen plate is located below the first grinding part, and partition holes are formed in the part close to the first rotating rod; the multiple scraping frames are fixedly arranged on the first rotating rod and located between the filter screen plate and the first grinder, and scraping plates are installed below the scraping frames; the second rotating rod is mounted at the bottom end of the first rotating rod and is fixedly provided with a second grinder; the partition annular plate is erected below the filter screen plate; the third rotating rod is mounted at the bottom end of the second rotating rod; and the third grinder is fixedly arranged on the third rotating rod. The eggshell powder grading grinding device has the effect of improving the eggshell powder grading grinding efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of eggshell powder production, and in particular to an eggshell powder crushing device and a preparation process of fine eggshell powder. Background Art

[0002] In the industrial production of poultry eggs, the eggshells are opened and the egg white and yolk inside are removed on the assembly line, and the eggshells are treated as waste. If a large number of eggshells containing egg white are directly discarded, they will produce a rotten smell and cause environmental pollution.

[0003] Eggshells are rich in inorganic salts and a small amount of inorganic substances, and have the effect of calcium supplementation. They can be widely used in the fields of food calcium source addition, feed addition, daily chemical product processing, cleaning, fertilizer, etc. When eggshells are recycled, they are generally processed into eggshell powder for use. The fineness of the eggshell powder and the processing method will directly affect the use effect of the eggshell powder.

[0004] The production process of eggshell powder generally goes through drying, crushing, grinding and other processes. Since the eggshell itself is fragile and the block diameter is small, equipment such as ore mills will not be used, and the efficiency of using ball mills is also low. Generally, the production requirements of eggshell powder can be met by rolling and grinding. Therefore, the commonly used eggshell powder production equipment will adopt the method of graded grinding to grind the eggshell powder multiple times to achieve production. In the graded grinding equipment, the ground powder in the bottom layer is finer, so the passing efficiency is lower. In addition, during the graded grinding process, the powder that meets the passing requirements of the next level will occupy the next level of grinding channel and pass through due to the mutual squeezing of eggshell fragments, resulting in invalid grinding, thereby reducing the grinding efficiency. Summary of the invention

[0005] In order to improve the defect in eggshell powder production that powder that meets the passing requirement of the next stage of grinding will occupy the next stage of grinding channel and cause reduced grinding efficiency, the present application provides an eggshell powder crushing device and a preparation process of fine eggshell powder.

[0006] The eggshell powder crushing device provided in this application adopts the following technical solution: An eggshell powder crushing device, comprising The barrel body has a feeding port at the top; The motor is installed on the top of the barrel, and the rotating shaft is arranged downward; The first rotating rod is fixed at the bottom end of the motor rotating shaft and extends into the top center position of the barrel body; The first grinding wheel is fixed on the circumferential outer wall of the first rotating rod, the outer diameter of the circumferential outer wall is expanded from the top to the bottom, and the distance from the position of the inner wall of the barrel body facing the first grinding wheel to the first grinding wheel gradually decreases; The first bracket is fixed on the inner wall of the barrel body, and is in contact with the bottom of the first grinding wheel and the circumferential inner wall. The circumferential inner wall is fixed with a stabilizing frame rotatably connected to the first rotating rod, and is directly opposite to the position opening between the first grinding wheel and the inner wall of the barrel body; The filter screen plate is installed on the inner wall of the barrel body and is located below the first grinding wheel. A partition hole is opened in the part close to the first rotating rod. The scraping racks are multiple and fixed on the first rotating rod, located between the filter screen plate and the first grinding, and a scraper is installed below. The first rotating rod rotates to move the eggshell powder around the filter screen plate to the partition hole through the scraper; The second rotating rod is installed at the bottom end of the first rotating rod and is located below the filter screen. The second rotating rod is fixed with a second grinding wheel, and the second grinding wheel is located directly below the partition hole. The outer diameter of the second grinding wheel gradually increases from the top to the bottom, and the increase amplitude gradually decreases. A connecting rod is fixedly arranged on the circumferential inner wall of the barrel body and is located below the filter screen plate; The partition ring plate is fixedly arranged at the end of the connecting rod, and wraps the space below the partition hole. The distance between the partition ring plate and the second grinding is continuously reduced, and the minimum distance is smaller than the minimum distance between the first grinding and the barrel body. A third rotating rod is mounted at the bottom end of the second rotating rod; The third grinding wheel is fixed on the third rotating rod and is located in the area between the partition ring plate and the barrel body. The distance between the third grinding wheel and the inner wall of the barrel body gradually decreases, and the minimum spacing is smaller than the minimum spacing between the second grinding wheel and the partition ring plate.

[0007] Optionally, the scraper frame is rotatably connected to a plurality of rotating rods, the rotating rods are vertically arranged and two of them form a group, an extension plate is fixedly arranged at the bottom end of the rotating rod, the extension plates on the same scraper frame are parallel to each other, the bottom ends of the two extension plates in the same group are rotatably connected to the same mounting plate, the scraper is obliquely fixed on the mounting plate, a first gear is fixedly arranged at the top end of the rotating rod, and a tooth chain meshing with the plurality of first gears is arranged at the top of the scraper frame; An inner gear ring is fixedly arranged on the circumferential inner wall of the first bracket, and the scraping frame is also rotatably connected to a driving rod, a second gear meshing with the inner gear ring is fixedly arranged on the top of the driving rod, and a third gear meshing with the toothed chain is also fixedly arranged on the driving rod.

[0008] Optionally, the scrapers on adjacent scraper racks are staggered in position.

[0009] Optionally, a material moving rack is arranged between two adjacent scraping racks, and a half barrel shell is fixedly arranged on the material moving rack near the inner wall of the barrel body, the arc surface inner wall of the half barrel shell faces the rotation direction of the first rotating rod, and the bottom of the half barrel shell can abut against the filter screen plate; The material moving rack is rotatably connected with a cross bar, the part of the cross bar inside the half barrel shell is distributed with threads, the cross bar is fixed with a first bevel gear at the end close to the first rotating rod, the material moving rack is rotatably connected with a transmission rod, the top end of the transmission rod is fixed with a fourth gear meshing with the inner gear ring, and the bottom end of the transmission rod is fixed with a second bevel gear meshing with the first bevel gear; The rotation of the first rotating rod causes the thread of the cross rod to move the eggshell powder toward the direction close to the first rotating rod.

[0010] Optionally, the scraper includes a main plate and a sub-plate, the main plate is fixedly connected to the mounting plate, there are multiple sub-plates, which are rotatably connected to the main plate, a retaining groove is provided at the bottom of the side wall of the main plate facing the rotation direction of the first rotating rod, and when the top of the sub-plate abuts against the retaining groove, it cannot continue to rotate in the opposite direction of the rotation of the first rotating rod, and at this time, the sub-plate is parallel to the main plate; The bottom of the auxiliary plate can abut against the upper surface of the filter screen plate.

[0011] Optionally, a pressing thread is fixedly provided on the top of the circumferential outer wall of the first grinding wheel, and the rotation of the first grinding wheel can cause the pressing thread to press the contacted object downward.

[0012] Optionally, the first grinder includes a main grinder and an auxiliary grinder, the main grinder is located at the top and fixedly connected to the first rotating rod, the auxiliary grinder is rotatably connected to the bottom of the main grinder, an outer gear ring is fixedly provided on the circumferential inner wall of the first bracket below the main grinder, a plurality of fifth gears are rotatably connected to the lower surface of the main grinder, the fifth gears are meshed with the outer gear ring, and a driven gear ring is fixedly provided on the circumferential inner wall of the auxiliary grinder, the driven gear ring is meshed with the fifth gear.

[0013] Optionally, a buckle shell is fixedly provided at the bottom end of the first rotating rod, an acceleration gear ring is fixedly provided on the circumferential inner wall of the buckle shell, an acceleration ring is mounted on the circumferential inner wall of the partition ring plate, an acceleration gear is rotatably connected to the upper surface of the acceleration ring, the acceleration gear is meshed with the acceleration gear ring, and a main gear is fixedly provided at the top end of the second rotating rod, the main gear is meshed with the acceleration gear.

[0014] The present application provides a process for preparing fine eggshell powder by using the following steps: A process for preparing fine eggshell powder, using the above-mentioned eggshell powder crushing device, comprises the following steps: S1. After rinsing the eggshells, dry them at 60-80°C for 2h and crush them with a roller; S2, the eggshell after crushing is put into the grinding equipment for preliminary grinding process, and the eggshell powder after preliminary grinding is filtered, the eggshell powder remaining on the filter screen after filtering is carried out mid-stage grinding, and the eggshell powder through the filter screen is carried out end-stage grinding; S3, grinding the eggshell powder after the middle stage grinding into the final stage; S4, after final grinding, fine eggshell powder is obtained; Among them, the mesh size of the filtration screen in step S2 is 80 meshes, and after final grinding, the eggshell powder can pass through a 300 mesh screen.

[0015] In summary, the present application includes at least one of the following beneficial technical effects: 1. After the broken eggshells enter the barrel, they are ground by the first grinding machine and then fall onto the filter screen. The scraper can move the eggshell powder on the filter screen to the partition hole. During the movement, the eggshell powder that meets the composite requirements will directly pass through the filter screen, and the eggshell powder that cannot pass through the filter screen will enter the partition ring plate through the partition hole and be further ground by the second grinding machine. The eggshell powder ground by the second grinding machine and the eggshell powder that passes through the filter screen are discharged after being ground by the third grinding machine, thereby achieving accurate graded grinding and improving the eggshell powder grinding efficiency; 2. During the first grinding rotation process, the crushed eggshells are pressed down by the pressing thread, thereby improving the feeding efficiency of the crushed eggshells. At the same time, the meshing of the fifth gear and the outer gear ring can drive the auxiliary mill to rotate faster than the main mill, further improving the grinding efficiency of the eggshell powder; 3. The inner gear ring meshes with the second gear to drive the third gear to rotate, and then drives the first gear to rotate through the tooth chain, so that the extension plate rotates, and then the scraper rotates relative to the scraper frame, and cooperates with the rotation of the auxiliary plate to scrape the outer eggshell powder inward and spread it on the filter screen. The staggered arrangement of the scrapers on adjacent scraper frames can effectively improve the uniformity of the eggshell powder spreading movement, thereby achieving uniform filtering of the eggshell powder on the filter screen; 4. The inner gear ring meshes with the fourth gear to drive the second bevel gear to rotate, and then drives the cross bar to rotate through the first bevel gear, and the eggshell powder on the outside is transferred to the inside through the thread of the cross bar, and then the eggshell powder that the edge scraper cannot reach is transported, thereby improving the filtering effect of the eggshell powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a partial cross-sectional view of an embodiment of the present application; Figure 2 is a partial cross-sectional view showing the first grinding; Figure 3 is a partial cross-sectional view showing a scraping assembly; Figure 4 yes Figure 3 Part A in the middle shows an enlarged view of the scraper; Figure 5 is a partial cross-sectional view showing the acceleration assembly.

[0017] In the figure, 1, barrel; 11, motor; 12, filter screen; 121, partition hole; 13, first bracket; 131, inner gear ring; 132, stabilizing frame; 133, outer gear ring; 14, connecting rod; 2, first rotating rod; 21, second rotating rod; 211, second grinding; 22, third rotating rod; 221, third grinding; 3, first grinding; 31, main grinding; 311, pressing thread; 312, fifth gear; 32, auxiliary grinding; 321, driven gear ring; 4, scraping assembly; 41, scraping frame; 411, rotating rod; 4111, first gear; 41 2. Extension plate; 4121. Mounting plate; 413. Tooth chain; 414. Drive rod; 4141. Second gear; 4142. Third gear; 42. Scraper; 421. Main board; 4211. Stop groove; 422. Sub-board; 43. Material transfer rack; 431. Half barrel shell; 432. Cross bar; 4321. First bevel gear; 433. Drive rod; 4331. Fourth gear; 4332. Second bevel gear; 5. Partition ring plate; 6. Acceleration assembly; 61. Buckle shell; 611. Acceleration gear ring; 62. Acceleration ring; 621. Acceleration gear; 63. Main gear;. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1-5 This application is described in further detail.

[0019] The embodiments of the present application disclose an eggshell powder crushing device and a process for preparing fine eggshell powder.

[0020] refer to Figure 1 and Figure 2 The eggshell powder crushing device includes a barrel body 1, a first rotating rod 2, a first grinding wheel 3, a second rotating rod 21, a second grinding wheel 211, a third rotating rod 22, a third grinding wheel 221, a filter screen plate 12, a partition ring plate 5 and a motor 11.

[0021] A feeding port is provided at the top of the barrel body 1 for feeding crushed eggshells. The motor 11 is installed at the top of the barrel body 1, and the rotating shaft is arranged downward and fixedly connected to the first rotating rod 2. The first rotating rod 2 is arranged vertically and extends into the center position of the top of the barrel body 1. The first grinding wheel 3 is fixed on the circumferential outer wall of the first rotating rod 2, and the outer diameter of the circumferential outer wall of the first grinding wheel 3 is set to expand from the top to the bottom, and the distance from the position where the inner wall of the barrel body 1 faces the first grinding wheel 3 gradually decreases. A first bracket 13 is fixed on the inner wall of the barrel body 1, and the first bracket 13 is fitted with the bottom and circumferential inner wall of the first grinding wheel 3 to support the first grinding wheel 3. A stabilizing frame 132 rotatably connected to the first rotating rod 2 is fixed on the circumferential inner wall of the first bracket 13 to improve the stability of the rotation of the first rotating rod 2. The first bracket 13 is arranged to avoid the position opening between the first grinding wheel 3 and the inner wall of the barrel body 1 to allow eggshell powder to pass through.

[0022] refer to Figure 2 and Figure 3 The first grinder 3 includes a main grinder 31 and a secondary grinder 32. The main grinder 31 is located at the top and is fixedly connected to the first rotating rod 2. The secondary grinder 32 is rotatably connected to the bottom of the main grinder 31. An outer gear ring 133 is fixedly provided on the circumferential inner wall of the first bracket 13 below the main grinder 31, and a plurality of fifth gears 312 are rotatably connected to the lower surface of the main grinder 31, and the fifth gears 312 are meshed with the outer gear ring 133. A driven gear ring 321 is fixedly provided on the circumferential inner wall of the secondary grinder 32, and the driven gear ring 321 is meshed with the fifth gear 312. A downward pressing thread 311 is fixedly provided on the circumferential outer wall of the main grinder 31, and the main grinder 31 rotates with the first rotating rod 2 so that the downward pressing thread 311 can press the contacted object downward.

[0023] The filter screen plate 12 is mounted on the inner wall of the barrel body 1 and is located below the first grinding 3. The filter screen plate 12 is provided with partition holes 121 at a portion close to the first rotating rod 2. The partition holes 121 are multiple and are evenly distributed around the first rotating rod 2. The first rotating rod 2 is provided with a scraping component 4 that evenly spreads the eggshell powder on the filter screen plate 12 and moves it to the partition holes 121.

[0024] The second rotating rod 21 is mounted at the bottom end of the first rotating rod 2, and an acceleration assembly 6 is arranged between the first rotating rod 2 and the second rotating rod 21 so that the rotation speed of the second rotating rod 21 is greater than the rotation speed of the first rotating rod 2. The second rotating rod 21 is located below the filter screen plate 12, and the second grinding 211 is fixed on the second rotating rod 21 and is located directly below the partition hole 121. The outer diameter of the second grinding 211 gradually increases from top to bottom and the increase amplitude gradually decreases. The circumferential inner wall of the barrel body 1 is fixed with a plurality of connecting rods 14 below the filter screen plate 12, and the circumferential outer wall of the partition ring plate 5 is fixedly connected to the connecting rod 14 and is located below the filter screen plate 12, and the top abuts against the lower surface of the filter screen plate 12. The partition ring plate 5 wraps the space below the partition hole 121, and the distance between the partition ring plate 5 and the second grinding 211 is continuously reduced, and the minimum spacing is less than the minimum spacing between the first grinding 3 and the barrel body 1. The third rotating rod 22 is fixedly mounted at the bottom end of the second rotating rod 21. The third grinding 221 is fixed on the third rotating rod 22. The edge of the third grinding 221 is located between the partition ring plate 5 and the circumferential inner wall of the barrel body 1. The distance between the third grinding 221 and the inner wall of the barrel body 1 gradually decreases, and the minimum distance is smaller than the minimum distance between the second grinding 211 and the partition ring plate 5.

[0025] After the eggshells are crushed, they are put into the barrel 1 through the feeding port and fall onto the first grinding wheel 3. As the eggshells accumulate, the pressing thread 311 gradually presses the eggshells downward during the rotation of the first rotating rod 2, thereby improving the efficiency of driving the eggshells downward for grinding. The auxiliary grinding wheel 32 can rotate at a faster speed than the main grinding wheel 31 under the meshing rotation of the outer gear ring 133 and the fifth gear 312, so that the main grinding wheel 31 maintains a suitable speed to press the eggshells downward, and the auxiliary grinding wheel 32 maintains a suitable speed to grind the eggshells, thereby improving the efficiency of the initial grinding of the eggshells. Since the eggshells are ground by the first grinding wheel 3 under the action of pressure and grinding, the eggshell powder that falls on the edge of the filter screen plate 12 contains powder that can directly pass through the filter screen plate 12, and also contains particles that cannot directly pass through the filter screen plate 12. Under the rotation of the first rotating rod 2, the eggshell powder falling on the filter screen plate 12 is spread by the scraping component 4, so that the eggshell powder that can pass through the filter screen plate 12 directly falls into the lower area; the eggshell powder that cannot pass through the filter screen plate 12 falls from the partition hole 121. The eggshell powder falling from the partition hole 121 is ground by the second grinding 211 and then enters the third grinding 221 for grinding, so that the eggshell powder falling from the filter screen plate 12 is directly ground by the third grinding 221, which reduces the probability of ineffective grinding of eggshell powder that meets the requirements under the condition of graded grinding, thereby improving the grinding efficiency of eggshell powder. The rotation speed of the second rotating rod 21 is increased under the action of the acceleration component 6, thereby improving the efficiency of graded grinding of eggshell powder.

[0026] refer to Figure 3 and Figure 4The scraping assembly 4 includes a scraping frame 41, a scraper 42 and a material moving frame 43. There are multiple scraping frames 41, which are fixed on the first rotating rod 2 and located between the filter screen 12 and the first frame. There are multiple rotating rods 411 rotatably connected to the scraping frame 41, and the rotating rods 411 are vertically arranged and two form a group. An extension plate 412 is fixed at the bottom end of the rotating rod 411, and the extension plates 412 on the same scraping frame 41 are parallel to each other. The bottom ends of the two extension plates 412 in the same group are rotatably connected to the same mounting plate 4121, and the scraper 42 is installed on the mounting plate 4121. The scraper 42 includes a main board 421 and a sub-board 422. The main board 421 is fixedly connected to the lower surface of the mounting plate 4121, and in the rotation direction of the first rotating rod 2, the end of the main board 421 away from the first rotating rod 2 is inclined toward the rotation direction of the first rotating rod 2. There are multiple sub-plates 422, which are vertically rotatably connected to the lower surface of the main plate 421, and the rotation axis of the sub-plate 422 is located on the side away from the first rotating rod 2. A retaining groove 4211 is provided at the bottom of the side wall of the main plate 421 facing the rotation direction of the first rotating rod 2. When the top of the sub-plate 422 abuts against the retaining groove 4211, it cannot continue to rotate in the opposite direction of the rotation of the first rotating rod 2. At this time, the sub-plate 422 is parallel to the main plate 421. The bottom of the sub-plate 422 can abut against the upper surface of the filter screen plate 12, and can move the contacted eggshell powder toward the direction close to the partition hole 121.

[0027] A first gear 4111 is fixedly disposed at the top of the rotating rod 411, and a toothed chain 413 meshing with the plurality of first gears 4111 is disposed at the top of the scraping frame 41. An inner toothed ring 131 is fixedly disposed on the circumferential inner wall of the first bracket 13, and the scraping frame 41 is also rotatably connected to a driving rod 414, a second gear 4141 meshing with the inner toothed ring 131 is fixedly disposed at the top of the driving rod 414, and a third gear 4142 meshing with the toothed chain 413 is also fixedly disposed on the driving rod 414. The scrapers 42 on adjacent scraping frames 41 are staggered.

[0028] The material moving rack 43 is mounted on two adjacent scraping racks 41. The material moving rack 43 is fixedly provided with a half barrel shell 431 at a position close to the inner wall of the barrel body 1, and the arc inner wall of the half barrel shell faces the rotation direction of the first rotating rod 2, and the bottom of the half barrel shell 431 can abut against the filter screen plate 12. The material moving rack 43 is rotatably connected with a cross bar, and the cross bar 432 is threaded in the part inside the half barrel shell 431. The cross bar 432 is fixedly provided with a first bevel gear 4321 at the end close to the first rotating rod 2, and the material moving rack 43 is rotatably connected with a transmission rod 433, and the top of the transmission rod 433 is fixedly provided with a fourth gear 4331 meshing with the inner gear ring 131, and the bottom of the transmission rod 433 is fixedly provided with a second bevel gear 4332 meshing with the first bevel gear 4321. The rotation of the first rotating rod 2 causes the thread of the cross bar 432 to move the eggshell powder in the direction close to the first rotating rod 2.

[0029] The eggshell powder will gradually fall to the edge of the filter screen 12. As the first rotating rod 2 rotates, the fourth gear 4331 rotates in mesh with the inner teeth, and then the cross bar 432 rotates through the meshing of the second bevel gear 4332 and the first bevel gear 4321, so that the eggshell powder accumulated on the half barrel shell 431 at the edge of the filter screen 12 moves toward the first rotating rod 2 under the rotation of the thread, and then the eggshell powder at the edge of the filter screen 12 moves stably to the area where it can be caught by the scraper 42.

[0030] As the first rotating rod 2 rotates, the second gear 4141 meshes with the inner gear ring 131, and then drives the tooth chain 413 to rotate through the third gear 4142, and the tooth chain 413 drives the first gear 4111 to rotate, and then the rotating rod 411 rotates. The rotating rod 411 drives the mounting plate 4121 to rotate on the scraping frame 41 through the extension plate 412, and then the scraper 42 rotates on the scraping frame 41, and then the eggshell powder in contact is spread flat as the scraping frame 41 rotates, and the eggshell powder is gradually moved to the partition hole 121 under the relay of multiple scrapers 42. The efficiency of spreading the eggshell powder on the filter screen plate 12 and moving it to the partition hole 121 is improved. The rotation setting of the auxiliary plate 422 enables the auxiliary plate 422 to abut against the retaining groove 4211 when the mounting plate 4121 moves forward to improve the efficiency of eggshell powder transportation; when the mounting plate 4121 moves backward, the auxiliary plate 422 is rotated open by resistance to reduce the push back of the eggshell powder.

[0031] refer to Figure 3 and Figure 5 The acceleration assembly 6 includes a buckle shell 61, an acceleration ring 62 and a main gear 63. The buckle shell 61 is fixed at the bottom end of the first rotating rod 2. An acceleration gear ring 611 is fixed on the circumferential inner wall of the buckle shell 61. The acceleration ring 62 is mounted on the circumferential inner wall of the partition ring plate 5 and is located at the bottom of the buckle shell 61. A plurality of acceleration gears 621 are rotatably connected to the upper surface of the acceleration ring 62, and the acceleration gears 621 are meshed with the acceleration gear ring 611. The main gear 63 is fixed at the top end of the second rotating rod 21, and the main gear 63 is meshed with the acceleration gear 621. The second rotating rod 21 is rotatably mounted in the barrel body 1. Therefore, during the rotation of the first rotating rod 2, the second rotating rod 21 can be rotated at a faster angular velocity than the first rotating rod 2, thereby improving the grinding efficiency of the second grinding 211.

[0032] The scraper 42 is only a technical feature term, and may also refer to a tool such as a brush having the same position and the same function for scraping powder off the filter.

[0033] The process for preparing fine eggshell powder using the eggshell powder crushing device comprises the following steps: S1. After rinsing the eggshells, dry them at 60-80°C for 2h and crush them with a roller; S2, the eggshell after crushing is put into the grinding equipment for preliminary grinding process, and the eggshell powder after preliminary grinding is filtered, the eggshell powder remaining on the filter screen after filtering is carried out mid-stage grinding, and the eggshell powder through the filter screen is carried out end-stage grinding; S3, grinding the eggshell powder after the middle stage grinding into the final stage; S4, after final grinding, fine eggshell powder is obtained; Among them, the mesh size of the filtration screen in step S2 is 80 meshes, and after final grinding, the eggshell powder can pass through a 300 mesh screen.

[0034] The implementation principle of the embodiment of the present application is: after the eggshell powder is initially ground, the ground eggshell powder is automatically screened and then graded and ground, rather than directly graded and ground step by step. The eggshells that do not meet the filtering requirements are ground in the middle section before the third grinding 221, and the eggshell powder that can pass the filtration is directly ground in the third grinding 221. The probability of the eggshell powder that meets the grinding requirements being ground ineffectively and occupying the eggshell powder passing through the grinding position is reduced, thereby improving the efficiency of eggshell powder grinding.

[0035] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An eggshell powder crushing device, characterized in that: include The barrel (1) has a feeding opening at the top; A motor (11) is mounted on the top of the barrel (1), with the rotating shaft arranged downward; The first rotating rod (2) is fixedly mounted at the bottom end of the rotating shaft of the motor (11) and extends into the top center position of the barrel body (1); The first grinding wheel (3) is fixedly mounted on the circumferential outer wall of the first rotating rod (2), the outer diameter of the circumferential outer wall is expanded from the top to the bottom, and the distance from the position of the inner wall of the barrel body (1) facing the first grinding wheel (3) to the first grinding wheel (3) gradually decreases; The first bracket (13) is fixed on the inner wall of the barrel body (1) and fits with the bottom and the circumferential inner wall of the first grinding wheel (3). The circumferential inner wall is fixed with a stabilizing bracket (132) rotatably connected to the first rotating rod (2) and is directly opposite to the position opening between the first grinding wheel (3) and the inner wall of the barrel body (1). A filter screen plate (12) is installed on the inner wall of the barrel (1) and is located below the first grinding (3). A partition hole (121) is provided in a portion close to the first rotating rod (2); A plurality of scraping racks (41) are fixedly mounted on the first rotating rod (2) and located between the filter screen plate (12) and the first grinding wheel (3). A scraper (42) is mounted below the first rotating rod (2). The first rotating rod (2) rotates to move the eggshell powder around the filter screen plate (12) toward the partition hole (121) through the scraper (42). The second rotating rod (21) is mounted at the bottom end of the first rotating rod (2) and is located below the filter screen plate (12). The second rotating rod (21) is fixed with a second grinding wheel (211). The second grinding wheel (211) is located directly below the partition hole (121). The outer diameter of the second grinding wheel (211) gradually increases from the top to the bottom, and the increase amplitude gradually decreases. A connecting rod (14) is fixedly mounted on the circumferential inner wall of the barrel body (1) and is located below the filter screen plate (12); The partition ring plate (5) is fixedly mounted on the end of the connecting rod (14) to enclose the space below the partition hole (121). The distance between the partition ring plate (5) and the second grinding wheel (211) is continuously reduced, and the minimum distance is smaller than the minimum distance between the first grinding wheel (3) and the barrel (1). A third rotating rod (22) is mounted on the bottom end of the second rotating rod (21); The third grinding wheel (221) is fixedly mounted on the third rotating rod (22) and is located in the area between the partition ring plate (5) and the barrel body (1). The distance between the third grinding wheel (221) and the inner wall of the barrel body (1) gradually decreases, and the minimum distance is smaller than the minimum distance between the second grinding wheel (211) and the partition ring plate (5).

2. The eggshell powder crushing device according to claim 1, characterized in that: A plurality of rotating rods (411) are rotatably connected to the scraper frame (41), the rotating rods (411) are vertically arranged and two of them form a group, an extension plate (412) is fixedly arranged at the bottom end of the rotating rods (411), the extension plates (412) on the same scraper frame (41) are parallel to each other, the bottom ends of the two extension plates (412) in the same group are rotatably connected to the same mounting plate (4121), the scraper plate (42) is obliquely fixed on the mounting plate (4121), a first gear (4111) is fixedly arranged at the top end of the rotating rods (411), and a tooth chain (413) meshing with the plurality of first gears (4111) is arranged at the top of the scraper frame (41); An inner toothed ring (131) is fixedly provided on the circumferential inner wall of the first bracket (13); the scraping frame (41) is also rotatably connected to a driving rod (414); a second gear (4141) meshing with the inner toothed ring (131) is fixedly provided on the top of the driving rod (414); and a third gear (4142) meshing with the toothed chain (413) is also fixedly provided on the driving rod (414).

3. The eggshell powder crushing device according to claim 2, characterized in that: The scrapers (42) on adjacent scraper frames (41) are arranged at staggered positions.

4. The eggshell powder crushing device according to claim 3, characterized in that: A material moving frame (43) is arranged between two adjacent scraping frames (41), and a half barrel shell (431) is fixedly arranged on the material moving frame (43) at a position close to the inner wall of the barrel body (1), the arc surface inner wall of the half barrel shell faces the rotation direction of the first rotating rod (2), and the bottom of the half barrel shell (431) can abut against the filter screen plate (12); The material moving rack (43) is rotatably connected to a cross bar, a portion of the cross bar (432) inside the half barrel shell (431) is provided with threads, a first bevel gear (4321) is fixedly provided at the end of the cross bar (432) close to the first rotating rod (2), the material moving rack (43) is rotatably connected to a transmission rod (433), a fourth gear (4331) meshing with the inner gear ring (131) is fixedly provided at the top end of the transmission rod (433), and a second bevel gear (4332) meshing with the first bevel gear (4321) is fixedly provided at the bottom end of the transmission rod (433); The rotation of the first rotating rod (2) causes the thread of the cross rod (432) to move the eggshell powder in a direction close to the first rotating rod (2).

5. The eggshell powder crushing device according to claim 3, characterized in that: The scraper (42) comprises a main plate (421) and a sub-plate (422); the main plate (421) is fixedly connected to the mounting plate (4121); there are a plurality of sub-plates (422) which are rotatably connected to the main plate (421); a retaining groove (4211) is provided at the bottom of the side wall of the main plate (421) facing the rotation direction of the first rotating rod (2); when the top of the sub-plate (422) abuts against the retaining groove (4211), the sub-plate (422) cannot continue to rotate in the opposite direction to the rotation direction of the first rotating rod (2); at this time, the sub-plate (422) is parallel to the main plate (421); The bottom of the auxiliary plate (422) can abut against the upper surface of the filter screen plate (12).

6. The eggshell powder crushing device according to claim 1, characterized in that: A pressing thread (311) is fixedly arranged on the top of the circumferential outer wall of the first grinding wheel (3). The first grinding wheel (3) is rotated so that the pressing thread (311) can press the contacted object downward.

7. The eggshell powder crushing device according to claim 1, characterized in that: The first grinding wheel (3) comprises a main grinding wheel (31) and an auxiliary grinding wheel (32). The main grinding wheel (31) is located at the top and is fixedly connected to the first rotating rod (2). The auxiliary grinding wheel (32) is rotatably connected to the bottom of the main grinding wheel (31). An outer toothed ring (133) is fixedly provided on the circumferential inner wall of the first bracket (13) below the main grinding wheel (31). A plurality of fifth gears (312) are rotatably connected to the lower surface of the main grinding wheel (31). The fifth gears (312) are meshed with the outer toothed ring (133). A driven toothed ring (321) is fixedly provided on the circumferential inner wall of the auxiliary grinding wheel (32). The driven toothed ring (321) is meshed with the fifth gears (312).

8. The eggshell powder crushing device according to claim 1, characterized in that: A buckle shell (61) is fixedly provided at the bottom end of the first rotating rod (2), an accelerating toothed ring (611) is fixedly provided on the circumferential inner wall of the buckle shell (61), an accelerating ring (62) is mounted on the circumferential inner wall of the partition ring plate (5), an accelerating gear (621) is rotatably connected to the upper surface of the accelerating ring (62), the accelerating gear (621) is meshed with the accelerating toothed ring (611), and a main gear (63) is fixedly provided at the top end of the second rotating rod (21), the main gear (63) is meshed with the accelerating gear (621).

9. A process for preparing fine eggshell powder, using the eggshell powder crushing device according to claim 1, characterized in that: The following steps are involved: S1. After rinsing the eggshells, dry them at 60-80°C for 2h and crush them with a roller; S2, the eggshell after crushing is put into the grinding equipment for preliminary grinding process, and the eggshell powder after preliminary grinding is filtered, the eggshell powder remaining on the filter screen after filtering is carried out mid-stage grinding, and the eggshell powder through the filter screen is carried out end-stage grinding; S3, grinding the eggshell powder after the middle stage grinding into the final stage; S4, after final grinding, fine eggshell powder is obtained; Among them, the mesh size of the filtration screen in step S2 is 80 meshes, and after final grinding, the eggshell powder can pass through a 300 mesh screen.

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