Process and device for preparing shell powder through high-temperature calcination of fresh oyster shells

Abstract

The invention relates to the technical field of shell powder preparation, discloses a process and a device for preparing shell powder by high-temperature calcination of oyster shells, and solves the problems of long time consumption and low efficiency due to the fact that crushing and grinding are carried out step by step when the shell powder is prepared by high-temperature calcination of the oyster shells in the prior art. The sorted fresh oyster shells are soaked with a dilute acid solution, and after impurities are cleaned, the fresh oyster shells are washed with deionized water for multiple times to ensure that no acid residue exists; drying the oyster shells in a drying oven to reduce the water content and facilitate subsequent calcination; dried oyster shells are placed in a muffle furnace, oxygen is introduced for calcination, rapid cooling is performed by means of a vacuum environment, the internal structure of the oyster shells is changed, the purity is improved, the key point is that the calcined oyster shells are treated by adopting a crushing and grinding integrated device, and compared with traditional step-by-step operation, the process is simplified, the production efficiency can be improved, the cost can be reduced, and high-quality shell powder can be obtained through screening.

Description

Technical Field

[0001] The invention relates to the technical field of shell powder preparation, and in particular to a process and a device for preparing shell powder by high-temperature calcination of oyster shells. Background Art

[0002] Oysters, as a widely cultivated and consumed shellfish, occupy an important position in the aquaculture industry around the world. The traditional way of dealing with oyster shells is mostly to discard or landfill them directly, which will take up a lot of land resources. In addition, the natural degradation rate of oyster shells is very slow. Long-term accumulation is prone to breed bacteria and emit odors, causing pollution to the surrounding soil, water and other environments. Preparing them into shell powder can avoid these environmental problems and realize the resource utilization of waste, which is in line with the current concept of green environmental protection and sustainable development.

[0003] The existing method of preparing shell powder by calcining oyster shells at high temperature is to crush the oyster shells through a jaw crusher and other crushing equipment after the calcined oyster shells are cooled, and then the crushed oyster shell fragments are discharged from the crushing equipment and poured into the inside of a grinder for grinding to prepare shell powder. This method is time-consuming and inefficient. During mechanical transportation, additional conveying devices are required, which increases equipment investment and maintenance costs.

[0004] In view of the above problems, an innovative design was carried out based on the original process and device for preparing shell powder by high-temperature calcination of oyster shells. Summary of the invention

[0005] The purpose of the present invention is to provide a process and device for preparing shell powder by high-temperature calcination of oyster shells. The device is used to work, thereby solving the problem that the existing process of preparing shell powder by high-temperature calcination of oyster shells is carried out in steps of crushing and grinding, which is time-consuming and inefficient.

[0006] To achieve the above object, the present invention provides the following technical solution: a process for preparing shell powder by high-temperature calcination of oyster shells, comprising the following steps:

[0007] S1: Using a dilute acid solution with a concentration of 0.1-0.2% to soak and clean the sorted oyster shells for 1 hour to remove various organic and inorganic impurities attached to the surface of the oyster shells. After acid soaking, use deionized water to rinse several times to ensure that there is no acid residue on the surface of the oyster shells;

[0008] S2: Then, the oyster shells are placed in an oven for drying to facilitate subsequent calcination;

[0009] S3: placing the dried oyster shells into a muffle furnace for calcining to generate a preliminary calcined product;

[0010] S4: The oyster shells are quickly and evenly cooled by evaporating water at low pressure in a vacuum environment, and the temperature is reduced to room temperature within 10 minutes, which can also improve the purity of the product;

[0011] S5: The calcined and cooled oyster shells are then ground into powder using an integrated crushing and grinding device, and then sieved to obtain shell powder.

[0012] Furthermore, in step S2, the oven is set at a temperature of 80-100° C. and a drying time of 3-5 hours to reduce the water content of the oyster shells to below 10%.

[0013] Furthermore, in step S3, when the oyster shells are placed in the muffle furnace for calcination, oxygen with a flow rate of 5-10 L / min is introduced into the furnace.

[0014] Another technical solution proposed by the present invention is an integrated crushing and grinding device for preparing shell powder by high-temperature calcination of oyster shells, comprising an outer shell and a crushing component and a grinding component rotatably connected to the inside of the outer shell, a support frame for fixing to the ground is arranged on the outside of the outer shell, the outer shell is composed of an upper shell, a middle shell and a lower shell, the upper shell, the middle shell and the lower shell are fixedly connected in sequence from top to bottom, a feed frame is arranged at the top end of the upper shell, a discharge pipe is arranged at the bottom end of the lower shell, the crushing component comprises a crushing structure rotatably connected to the inside of the upper shell, the crushing structure is used to extrude and crush the original oyster shell into fragments, an abrasive structure is also rotatably connected to the inside of the middle shell, the abrasive structure is used to crush and grind the crushed oyster shell fragments again into a smaller volume, a bidirectional motor is fixedly connected to the inside of the middle shell, and a reverse drive structure is fixedly connected to the inside of the middle shell.

[0015] Furthermore, the reverse drive structure includes a fixed plate fixedly mounted on the inner wall of the middle shell body, a fixed shell is provided on one side of the fixed plate, a bevel gear 1 is rotatably connected inside the fixed shell, a rotating shaft is also rotatably connected inside the fixed shell, a bevel gear 2 is provided at one end of the rotating shaft, bevel gear 2 is a half gear structure, bevel gear 3 is also rotatably connected inside the fixed shell, bevel gear 3 is also a half gear structure, bevel gear 2 is meshingly connected with bevel gear 1, bevel gear 2 is meshingly connected with bevel gear 3, and bevel gear 1 and bevel gear 3 rotate in opposite directions.

[0016] Furthermore, a driven rod is provided on one side of the bevel gear three, a spring is provided between the driven rod and one end of the bidirectional motor, the driven rod extends to the outer end of the fixed shell, the bevel gear one is connected to one end of the bidirectional motor, one end of the bidirectional motor extends to the interior of the fixed shell, and a fixed sleeve is provided on one side of the bevel gear one, bevel gear two and bevel gear three, and the fixed sleeve is rotatably connected to the bidirectional motor, the rotating shaft and the driven rod.

[0017] Furthermore, the crushing structure includes a turntable arranged at one end of the driven rod, the top of the turntable is rotatably connected to a guide block, the surface of the turntable begins to have an arc groove, four groups of arc grooves are evenly spaced, the insides of the four groups of arc grooves are respectively slidably connected to sliding blocks, the crushing structure also includes a fixed rod arranged at the top of the fixed shell, the top of the fixed rod is provided with a cross plate, the surface of the cross plate is provided with a sliding groove, the inside of the sliding groove is slidably connected to a slide plate, the slide plate is connected and fixed to the sliding block, a breaking plate is provided at one end of the slide plate, the breaking plate is arc-shaped, a convex strip is provided on the outer side of the breaking plate, a convex ring is also provided on the inner wall of the upper shell, and the convex ring and the convex strip are staggered.

[0018] Furthermore, the abrasive structure includes connecting blocks arranged on the inner wall of the middle shell body, and there are four groups of connecting blocks distributed at equal intervals. A circular shell is fixedly installed on one side of the four groups of connecting blocks, and a gear ring is arranged inside the circular shell. A sun gear is arranged at the other end of the bidirectional motor, and a planetary gear is meshed and connected between the sun gear and the gear ring. There are eight groups of planetary gears distributed at equal intervals, and one side of the eight groups of planetary gears is respectively provided with a rotating column, and the surface of each group of rotating columns is provided with four groups of cams, and the diameters of the four groups of cams gradually decrease from top to bottom. A sleeve shell is arranged at the upper end of the circular shell, and the sleeve shell covers the outer end of the bidirectional motor.

[0019] Furthermore, a grinding block assembly is rotatably connected inside the lower shell body, and the grinding block assembly includes a connecting plate arranged at the other end of the bidirectional motor, and a grinding table is arranged at the end of the connecting plate away from the bidirectional motor, and the grinding table is in the shape of a round table with a small top and a large bottom. A grinding plate is arranged at the bottom end of the grinding table, and the grinding plate is annular. A fine grinding structure is also rotatably connected inside the lower shell body, and the fine grinding structure includes a grinding disc arranged at the other end of the bidirectional motor, and the grinding disc is made of a round table and a round plate. Grinding strips are arranged on the surface of the grinding disc, and steel balls are rollingly connected to the upper end of the screen, and a number of steel balls are distributed.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention proposes a process and device for preparing shell powder by calcining oyster shells at high temperature. The existing process of preparing shell powder by calcining oyster shells at high temperature is carried out in separate steps of crushing and grinding, which is time-consuming and inefficient. The present invention uses a dilute acid solution to soak and clean the sorted oyster shells to remove various organic and inorganic impurities, and rinses them with deionized water for multiple times after acid immersion to ensure that there is no acid residue. The oyster shells are then placed in an oven for drying to reduce their water content to a certain level, creating conditions for subsequent calcination. The dried oyster shells are then placed in a muffle furnace for calcination, while an appropriate amount of oxygen is introduced, and the shells are quickly cooled to room temperature in a vacuum environment, so that the internal structure of the oyster shells is changed, the organic matter is fully burned and decomposed, and the purity of the product is improved. In particular, compared with the traditional method of crushing and grinding in separate steps, the present technical solution uses an integrated crushing and grinding device to process the calcined and cooled oyster shells, so as to simplify the processing flow and reduce the equipment footprint, thereby improving production efficiency and reducing production costs. At the same time, the powder particle size can be better controlled, the product quality stability can be improved, and finally high-quality shell powder can be obtained through screening.

[0022] In the crushing process, the guide block inside the upper shell accurately guides the oyster shell to the breaking plate, and the bidirectional motor drives the bevel gear set to drive the turntable, arc groove, sliding block and other components to work together, so that the breaking plate works together, and the half gear cooperates with the spring to realize its reciprocating motion, so that the crushing effect is uniform and sufficient with low cost; in the crushing and grinding process, the bidirectional motor drives the sun gear to drive the planetary gear set, and the revolution and rotation are combined, and the fragments are finely processed with cams of different diameters. The frustum-shaped middle shell helps the material fall, and the grinding table, grinding plate, grinding disc and grinding strips are ground multiple times to make the powder particle size finer and more uniform; the screen screens out qualified shell powder in time to ensure quality consistency and production efficiency, and the steel balls between the screen and the grinding strips roll to make the friction uniform, reduce accumulation and blockage, and further improve the grinding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the overall three-dimensional cross-sectional structure of the present invention;

[0025] Figure 3 It is a three-dimensional structural schematic diagram of the bidirectional motor, the reverse driving structure and the crushing structure of the present invention;

[0026] Figure 4 It is a schematic diagram of the three-dimensional structure of the crushing structure and the guide block of the present invention;

[0027] Figure 5 It is a schematic diagram of the three-dimensional unfolded structure of the abrasive structure of the present invention;

[0028] Figure 6 It is a schematic diagram of the three-dimensional structure of the grinding block assembly of the present invention;

[0029] Figure 7 It is a schematic diagram of the front cross-section structure of the fine grinding structure of the present invention;

[0030] Figure 8 It is a schematic diagram of the three-dimensional unfolded structure of the fine grinding structure of the present invention.

[0031] In the figure: 1, shell; 101, upper shell; 102, middle shell; 103, lower shell; 2, support frame; 3, guide block; 4, feed frame; 5, discharge pipe; 6, bidirectional motor; 7, reverse drive structure; 71, fixed plate; 72, fixed shell; 73, bevel gear 1; 74, bevel gear 2; 75, bevel gear 3; 76, fixed sleeve; 77, fixed rod; 78, rotating shaft; 79, spring; 710, driven rod; 8, crushing structure; 82, turntable; 83, arc groove; 84 , sliding block; 85, sliding plate; 86, cross plate; 87, sliding groove; 88, breaking plate; 89, convex strip; 810, convex ring; 9, abrasive structure; 91, connecting block; 92, round shell; 93, gear ring; 94, planetary gear; 95, sun gear; 96, rotating column; 97, cam; 98, sleeve; 11, screen; 12, fine grinding structure; 121, grinding disc; 122, grinding strip; 13, steel ball; 14, grinding block assembly; 141, connecting plate; 142, grinding table; 143, grinding plate. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings.

[0034] A process for preparing shell powder by high-temperature calcination of oyster shells, comprising the following steps: S1: soaking and cleaning the sorted oyster shells in a dilute acid solution with a concentration of 0.1-0.2%, the soaking time is set to 1 hour, and various organic and inorganic impurities attached to the surface of the oyster shells are washed away. After acid immersion, deionized water is used for multiple rinses to ensure that there is no acid residue on the surface of the oyster shells; S2: then putting the oyster shells into an oven for drying, the oven temperature is set to 80-100°C, the drying time is 3-5 hours, so that the water content of the oyster shells is reduced to less than 10%, and when the oyster shells are put into a muffle furnace for calcination, a The flow rate of oxygen is 5-10L / min, and the calcination temperature is set at 800-1000℃. This temperature range can fully burn and decompose the organic matter in the oyster shells, and last for 4-6 hours, so that the internal structure of the oyster shells changes to facilitate subsequent calcination; S3: The dried oyster shells are placed in a muffle furnace for calcination to generate preliminary calcination products; S4: The oyster shells are quickly and evenly cooled by low-pressure evaporation of water in a vacuum environment to absorb heat, and the temperature is reduced to room temperature within 10 minutes, which can also improve the purity of the product; S5: The calcined and cooled oyster shells are then ground into powder through an integrated crushing and grinding device, and then screened to obtain shell powder.

[0035] The present invention will be further described below in conjunction with the embodiments.

[0036] See also Figure 1-8 Another technical solution proposed by the present invention is a crushing and grinding integrated device for preparing shell powder by high-temperature calcination of oyster shells, comprising an outer shell 1 and a crushing component and a grinding component rotatably connected to the inside of the outer shell 1, a support frame 2 for fixing to the ground is arranged on the outside of the outer shell 1, the outer shell 1 is composed of an upper shell 101, a middle shell 102 and a lower shell 103, the upper shell 101, the middle shell 102 and the lower shell 103 are fixedly connected from top to bottom in sequence, a feed frame 4 is arranged at the top of the upper shell 101, a discharge pipe 5 is arranged at the bottom of the lower shell 103, the crushing component comprises a crushing structure 8 rotatably connected to the inside of the upper shell 101, the crushing structure 8 is used to squeeze and crush the original oyster shell into fragments, an abrasive structure 9 is also rotatably connected to the inside of the middle shell 102, the abrasive structure 9 is used to crush and grind the crushed oyster shell fragments into a smaller volume again, a bidirectional motor 6 is fixedly connected to the inside of the middle shell 102, and a reverse drive structure 7 is fixedly connected to the inside of the middle shell 102.

[0037] The reverse drive structure 7 includes a fixed plate 71 fixedly mounted on the inner wall of the middle housing 102, a fixed shell 72 is provided on one side of the fixed plate 71, a bevel gear 1 73 is rotatably connected inside the fixed shell 72, a rotating shaft 78 is also rotatably connected inside the fixed shell 72, a bevel gear 2 74 is provided at one end of the rotating shaft 78, the bevel gear 2 74 is a half gear structure, the bevel gear 3 75 is also rotatably connected inside the fixed shell 72, the bevel gear 3 75 is also a half gear structure, the bevel gear 2 74 is meshedly connected with the bevel gear 1 73, and the bevel gear 2 74 is meshedly connected with the bevel gear 3 75 , bevel gear 1 73 and bevel gear 3 75 rotate in opposite directions, a driven rod 710 is provided on one side of bevel gear 3 75, a clockwork 79 is provided between the driven rod 710 and one end of the bidirectional motor 6, the driven rod 710 extends to the outer end of the fixed shell 72, bevel gear 1 73 is connected to one end of the bidirectional motor 6, one end of the bidirectional motor 6 extends to the inside of the fixed shell 72, and a fixed sleeve frame 76 is provided on one side of bevel gear 1 73, bevel gear 2 74 and bevel gear 3 75, and the fixed sleeve frame 76 is rotatably connected with the bidirectional motor 6, the rotating shaft 78 and the driven rod 710 for convenient driving.

[0038] The crushing structure 8 includes a turntable 82 arranged at one end of the driven rod 710, and the top of the turntable 82 is rotatably connected to the guide block 3. An arc groove 83 is formed on the surface of the turntable 82, and four groups of arc grooves 83 are provided at equal intervals. The insides of the four groups of arc grooves 83 are respectively slidably connected with sliding blocks 84. The crushing structure 8 also includes a fixed rod 77 arranged at the top of the fixed shell 72, and a cross plate 86 is provided at the top of the fixed rod 77. A slide groove 87 is provided on the surface of the cross plate 86, and a slide plate 85 is slidably connected inside the slide groove 87. The slide plate 85 is connected and fixed to the sliding block 84. A breaking plate 88 is provided at one end of the slide plate 85. The breaking plate 88 is arc-shaped, and a convex strip 89 is provided on the outer side of the breaking plate 88. A convex ring 810 is also provided on the inner wall of the upper shell 101. The convex ring 810 and the convex strip 89 are staggered, which is convenient for crushing the oyster shells for subsequent grinding.

[0039] The abrasive structure 9 includes a connecting block 91 arranged on the inner wall of the middle shell 102, and there are four groups of connecting blocks 91 distributed at equal intervals. A circular shell 92 is fixedly installed on one side of the four groups of connecting blocks 91, and a ring gear 93 is arranged inside the circular shell 92. A sun gear 95 is arranged at the other end of the bidirectional motor 6, and a planetary gear 94 is meshed and connected between the sun gear 95 and the ring gear 93. There are eight groups of planetary gears 94 distributed at equal intervals, and a rotating column 96 is respectively arranged on one side of the eight groups of planetary gears 94. Four groups of cams 97 are arranged on the surface of each group of rotating columns 96. The diameters of the four groups of cams 97 gradually decrease from top to bottom. A sleeve shell 98 is arranged on the upper end of the circular shell 92, and the sleeve shell 98 covers the outer end of the bidirectional motor 6, which can gradually crush and grind the fragments according to different diameters, so that the crushing and grinding effects are better and finer powder is obtained.

[0040] The lower shell 103 is internally rotatably connected with a grinding block assembly 14, which includes a connecting plate 141 arranged at the other end of the bidirectional motor 6, and a grinding table 142 is arranged at the end of the connecting plate 141 away from the bidirectional motor 6. The grinding table 142 is in the shape of a truncated cone with a small top and a large bottom. A grinding plate 143 is arranged at the bottom of the grinding table 142, and the grinding plate 143 is annular. The lower shell 103 is also rotatably connected with a fine grinding structure 12 inside, and the fine grinding structure 12 includes a grinding disc 121 arranged at the other end of the bidirectional motor 6, and the grinding disc 121 is made of a truncated cone and a circular plate. A grinding bar 122 is arranged on the surface of the grinding disc 121, and the upper end of the screen 11 is rollingly connected with steel balls 13, and a plurality of steel balls 13 are distributed, which can make the friction between the grinding bar 122 and the material more uniform and reduce the accumulation and blockage of the material.

[0041] Specifically, a dilute acid solution with a concentration of 0.1-0.2% is selected to soak and clean the sorted oyster shells, and the soaking time is set to 1 hour to wash away various organic and inorganic impurities attached to the surface of the oyster shells. After acid immersion, deionized water is used for multiple rinses to ensure that there is no acid residue on the surface of the oyster shells; then the oyster shells are placed in an oven for drying, and the oven is set at a temperature of 80-100°C and the drying time is 3-5 hours, so that the water content of the oyster shells is reduced to less than 10%, which is convenient for subsequent calcination; the dried oyster shells are placed in a muffle furnace for calcination, and the oyster shells are placed in a muffle furnace for calcination. When the shells are placed in a muffle furnace for calcination, oxygen with a flow rate of 5-10 L / min is introduced into the furnace to generate preliminary calcined products. The calcination temperature is set at 800-1000° C. This temperature range can fully burn and decompose organic matter in the oyster shells, and last for 4-6 hours, so that the internal structure of the oyster shells changes. The oyster shells are quickly and evenly cooled by low-pressure evaporation and heat absorption of water in a vacuum environment, and the temperature is reduced to room temperature within 10 minutes, which can also improve the purity of the product. The calcined and cooled oyster shells are then ground into powder through an integrated crushing and grinding device, and then screened to obtain shell powder.

[0042] The calcined and cooled oyster shells are poured into the feeding frame 4 at the upper end of the upper shell 101. Since the upper shell 101 is provided with a guide block 3, the poured oyster shells pass through the guide block 3 and fall between the breaking plate 88 and the upper shell 101. At the same time, the bidirectional motor 6 is driven, and the bidirectional motor 6 drives the bevel gear 1 73 at one end to mesh with the bevel gear 2 74 and rotate, and the bevel gear 2 74 is meshed with the bevel gear 3 75 and rotates, and the bevel gear 3 75 drives the driven rod 7 10 rotates, the driven rod 710 drives the rotating disk 82 to rotate, and the rotating disk 82 drives the four groups of arc grooves 83 opened on the surface to rotate, so that the four groups of arc grooves 83 slide from one end close to the center of the rotating disk 82 to the other end, and the sliding block 84 drives the slide plate 85 at the bottom to slide toward the outer end inside the slide groove 87, and the slide plate 85 drives the breaking plate 88 at one end to approach the inner wall of the upper shell 101, and the outer side of the breaking plate 88 is provided with convex strips 89 at equal intervals, and the convex strips 89 are aligned with the upper shell 101. The convex ring 810 on the inner wall of 01 is staggered, and further the four groups of breaking plates 88 move outward at the same time to squeeze and crush the oyster shells, so that the four groups of breaking plates 88 can move outward at the same time to squeeze and crush the oyster shells, and the crushing effect is more uniform and sufficient, and the crushing efficiency is improved. Since the bevel gear 1 73 and the bevel gear 2 74 are semi-gear structures, a spring 79 is arranged between one end of the bidirectional motor 6 and the driven rod 710, so that the bevel gear 3 75 is returned to its position through the spring 79 when it is not meshed and driven, so as to wait to be driven again, and the reciprocating operation makes the breaking plate 88 and the convex strip 89 reciprocate to impact and crush the oyster shells, and the convex strip 89 and the convex ring 810 improve the crushing efficiency. The beneficial effect of the cooperation between the semi-gear structure and the spring 79 is that the reciprocating motion of the breaking plate 88 can be realized, and the crushing effect is further enhanced. The power of the motor can be effectively transmitted, and the coordinated operation of each component is realized, so that the operation of the equipment is more stable and efficient, and the complexity and cost of the equipment are reduced;

[0043] At the same time, the bidirectional motor 6 drives the sun gear 95 at the other end to rotate, and the sun gear 95 is meshed with the eight sets of planetary gears 94 on the outside, and the eight sets of planetary gears 94 are meshed with the ring gear 93, and the ring gear 93 is fixed inside the round shell 92. The round shell 92 is fixedly connected to the inner wall of the middle shell 102 through the four sets of connecting blocks 91 on the outside, so that the eight sets of planetary gears 94 rotate while revolving around the sun gear 95, and the eight sets of planetary gears 94 respectively drive the rotating column 96 on one side to rotate. The surface of each set of rotating columns 96 is distributed with cams 97 with diameters from large to small from top to bottom. The cam 97 crushes and grinds the oyster shell fragments crushed by the breaking plate 88 again, and can gradually crush and grind the fragments according to different diameters, so that the crushing and grinding effect is better and finer powder is obtained. Since the middle shell 102 is a truncated cone, with a large top and a small bottom, it is conducive to the natural falling of powder and fragments under the action of gravity, so that the material can smoothly enter the next processing link, and the powder and fragments crushed and ground by the cam 97 fall into the grinding table The grinding plate 142 and the grinding plate 143 are between the inner wall of the lower shell 103, and the grinding table 142 and the grinding plate 143 at the other end are driven by the bidirectional motor 6 to grind the powder, and the bidirectional motor 6 will also drive the grinding disc 121 to rotate to grind the powder again. The grinding strips 122 are arranged on the outer side of the grinding disc 121, and the powder is ground multiple times, which further improves the grinding effect and makes the particle size of the shell powder finer and more uniform. A screen 11 is arranged at the bottom end of the lower shell 103 to screen the ground shell powder. The screen 11 can timely screen out the shell powder that meets the particle size requirements, ensure the quality and particle size consistency of the product, and improve the production efficiency. The screen 11 and the grinding bar 122 are rollingly connected with steel balls 13. A plurality of steel balls 13 are provided. The steel balls 13 roll between the screen 11 and the grinding bar 122, which can make the friction between the grinding bar 122 and the material more uniform, reduce the accumulation and blockage of the material, thereby improving the grinding efficiency of the grinding disc 121 on the powder, and making the particle size of the shell powder finer and more uniform.

[0044] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process for preparing shell powder by high temperature calcination of oyster shells, comprising the following steps: S1: Using a dilute acid solution with a concentration of 0.1-0.2% to soak and clean the sorted oyster shells for 1 hour to remove various organic and inorganic impurities attached to the surface of the oyster shells. After acid soaking, use deionized water to rinse several times to ensure that there is no acid residue on the surface of the oyster shells; S2: Then, the oyster shells are placed in an oven for drying to facilitate subsequent calcination; S3: placing the dried oyster shells into a muffle furnace for calcining to generate a preliminary calcined product; S4: The oyster shells are quickly and evenly cooled by evaporating water at low pressure in a vacuum environment, and the temperature is reduced to room temperature within 10 minutes, which can also improve the purity of the product; S5: The calcined and cooled oyster shells are then ground into powder using an integrated crushing and grinding device, and then sieved to obtain shell powder.

2. The process for preparing shell powder by high temperature calcination of oyster shells according to claim 1, characterized in that: In step S2, the oven is set at a temperature of 80-100° C. and a drying time of 3-5 hours to reduce the water content of the oyster shells to below 10%.

3. The process for preparing shell powder by high temperature calcination of oyster shells according to claim 1, characterized in that: In step S3, when the oyster shells are placed in the muffle furnace for calcination, oxygen with a flow rate of 5-10 L / min is introduced into the furnace.

4. The integrated crushing and grinding device for preparing shell powder by high-temperature calcination of oyster shells according to claim 1 is characterized in that: In step S3, the calcination temperature is set at 800-1000°C. This temperature range can fully burn and decompose the organic matter in the oyster shells and last for 4-6 hours, causing changes in the internal structure of the oyster shells.

5. The integrated crushing and grinding device for preparing shell powder by high-temperature calcination of oyster shells according to claim 1 is characterized in that: The integrated crushing and grinding device mentioned in step S5 comprises a housing (1) and a crushing assembly and a grinding assembly rotatably connected to the inside of the housing (1); a support frame (2) for fixing to the ground is arranged on the outside of the housing (1); the housing (1) is composed of an upper housing (101), a middle housing (102) and a lower housing (103); the upper housing (101), the middle housing (102) and the lower housing (103) are fixedly connected in sequence from top to bottom; a feed frame (4) is arranged at the top of the upper housing (101); and the lower housing (103) is provided with a feed frame (4). ) is provided with a discharge pipe (5) at the bottom end, the crushing assembly includes a crushing structure (8) rotatably connected to the interior of the upper shell (101), the crushing structure (8) is used to squeeze and crush the original oyster shell into fragments, the interior of the middle shell (102) is also rotatably connected to an abrasive structure (9), the abrasive structure (9) is used to crush and grind the crushed oyster shell fragments into a smaller volume again, the interior of the middle shell (102) is fixedly connected to a bidirectional motor (6), and the interior of the middle shell (102) is fixedly connected to a reverse drive structure (7).

6. The integrated crushing and grinding device for preparing shell powder by high-temperature calcination of oyster shells according to claim 5 is characterized in that: The reverse drive structure (7) comprises a fixed plate (71) fixedly mounted on the inner wall of the middle housing (102); a fixed shell (72) is arranged on one side of the fixed plate (71); a bevel gear 1 (73) is rotatably connected inside the fixed shell (72); a rotating shaft (78) is also rotatably connected inside the fixed shell (72); a bevel gear 2 (74) is arranged at one end of the rotating shaft (78); the bevel gear 2 (74) is a half gear structure; a bevel gear 3 (75) is also rotatably connected inside the fixed shell (72); the bevel gear 3 (75) is also a half gear structure; the bevel gear 2 (74) is meshingly connected with the bevel gear 1 (73); the bevel gear 2 (74) is meshingly connected with the bevel gear 3 (75); the bevel gear 1 (73) and the bevel gear 3 (75) rotate in opposite directions.

7. The integrated crushing and grinding device for preparing shell powder by high-temperature calcination of oyster shells according to claim 6 is characterized in that: A driven rod (710) is arranged on one side of the bevel gear three (75), a spring (79) is arranged between the driven rod (710) and one end of the bidirectional motor (6), the driven rod (710) extends to the outer end of the fixed shell (72), the bevel gear one (73) is connected to one end of the bidirectional motor (6), one end of the bidirectional motor (6) extends to the inside of the fixed shell (72), and a fixed sleeve (76) is arranged on one side of the bevel gear one (73), the bevel gear two (74) and the bevel gear three (75), and the fixed sleeve (76) is rotatably connected to the bidirectional motor (6), the rotating shaft (78) and the driven rod (710).

8. The integrated crushing and grinding device for preparing shell powder by high-temperature calcination of oyster shells according to claim 5 is characterized in that: The crushing structure (8) comprises a rotating disk (82) arranged at one end of the driven rod (710), the top of the rotating disk (82) is rotatably connected to a guide block (3), the surface of the rotating disk (82) begins to have an arc-shaped groove (83), four groups of arc-shaped grooves (83) are arranged at equal intervals, and the insides of the four groups of arc-shaped grooves (83) are respectively slidably connected to sliding blocks (84), the crushing structure (8) also comprises a fixed rod (77) arranged at the top of the fixed shell (72), and the top of the fixed rod (77) is provided with ten The cross plate (86) is provided with a slide groove (87) on its surface, a slide plate (85) is slidably connected inside the slide groove (87), the slide plate (85) is fixedly connected to the sliding block (84), a breaking plate (88) is provided at one end of the slide plate (85), the breaking plate (88) is arc-shaped, and a convex strip (89) is provided on the outer side of the breaking plate (88), and a convex ring (810) is also provided on the inner wall of the upper shell (101), and the convex ring (810) and the convex strip (89) are staggered.

9. The integrated crushing and grinding device for preparing shell powder by high-temperature calcination of oyster shells according to claim 5, characterized in that: The abrasive structure (9) comprises a connecting block (91) arranged on the inner wall of the middle shell (102), and the connecting blocks (91) are arranged in four groups at equal intervals. A round shell (92) is fixedly mounted on one side of the four groups of connecting blocks (91), and a gear ring (93) is arranged inside the round shell (92). A sun gear (95) is arranged at the other end of the bidirectional motor (6), and a planetary gear (94) is meshedly connected between the sun gear (95) and the gear ring (93). There are eight groups of planetary gears (94) arranged in eight groups at equal intervals. A rotating column (96) is arranged on one side of the eight groups of planetary gears (94), and four groups of cams (97) are arranged on the surface of each group of rotating columns (96). The diameters of the four groups of cams (97) decrease gradually from top to bottom. A sleeve shell (98) is arranged at the upper end of the round shell (92), and the sleeve shell (98) covers the outer end of the bidirectional motor (6).

10. The integrated crushing and grinding device for preparing shell powder by high-temperature calcination of oyster shells according to claim 5, characterized in that: The lower shell (103) is rotatably connected to a grinding block assembly (14) inside. The grinding block assembly (14) includes a connecting plate (141) arranged at the other end of the bidirectional motor (6). A grinding table (142) is arranged at the end of the connecting plate (141) away from the bidirectional motor (6). The grinding table (142) is in the shape of a round table with a small top and a large bottom. A grinding plate (143) is arranged at the bottom end of the grinding table (142). The grinding plate (143) is in the shape of a ring. The lower shell (103) is also rotatably connected to a fine grinding structure (12). The fine grinding structure (12) includes a grinding disc (121) arranged at the other end of the bidirectional motor (6). The grinding disc (121) is made by splicing a round table and a round plate. A grinding strip (122) is arranged on the surface of the grinding disc (121). The upper end of the screen (11) is rollingly connected to steel balls (13). A plurality of steel balls (13) are distributed.

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