Jet mill for silver powder production and silver powder production method thereof

Abstract

The invention discloses a jet mill for silver powder production and a silver powder production method.The jet mill comprises a main body, a feeding mechanism, a discharging mechanism and an air supply dust removal mechanism, and the main body comprises a crushing bin, a first-stage supporting column, a grading bin, an air bag, an air inlet, a flow dividing pipe, a Laval spraying pipe, a discharging opening, a grading motor and a grading turbine; the silver powder crushing device has the beneficial effects that the blanking mechanism is arranged to be matched with the air supply and dust removal mechanism, so that impurities such as dust on the surfaces of silver particles can be cleaned before the silver particles enter the crushing bin, the quality of silver powder can be improved, the rotating cage can rotate by 180 degrees, and the crushing efficiency is improved. The filter screen can be prevented from being blocked by special-shaped silver particles or silver particles with burrs in cooperation with the brush plate, the rotating cage rotates by 180 degrees to switch the first-stage arc-shaped air bin or the second-stage arc-shaped air bin to discharge air, it is guaranteed that airflow in the discharging bin flows towards the outlet direction of the ash discharging hopper in cooperation with the discharging plate, the silver particles slide down against the wind, and the dust removal effect is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of silver powder production, and in particular to an air flow pulverizer for silver powder production and a silver powder production method thereof. Background Art

[0002] Silver powder is a fine particle made of metallic silver, commonly used in conductive coatings, conductive adhesives, cosmetics and other fields. Airflow pulverizer is a device that uses high-speed airflow to crush and grade materials. It has the characteristics of high efficiency, fineness and strong controllability. In the process of silver powder processing, airflow pulverizer plays an important role. Through airflow pulverizer, silver powder particles can be crushed to the required fineness, thereby improving the quality and application performance of silver powder.

[0003] At present, when silver powder is processed by an air flow mill, silver particles are generally poured directly into the hopper of the air flow mill. Since silver particles have a high surface energy, they are easy to absorb particulate matter in the air, including dust and other impurities. These impurities will reduce the quality of the processed silver powder if they are not treated. Therefore, an air flow mill for silver powder production and a silver powder production method thereof are proposed. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] The present invention has been proposed in view of the above-mentioned problems.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a jet mill for silver powder production, comprising: The main body includes a crushing bin, a primary pillar, a grading bin, an air bag, an air inlet, a diverter pipe, a Laval nozzle, a discharge port, a grading motor and a grading turbine. The primary pillar is fixedly connected to four groups at the bottom of the crushing bin. The grading bin is fixedly connected to the top of the crushing bin. The air bag is annular and fixedly sleeved on the outside of the crushing bin. The air inlet is fixedly connected to the side wall of the air bag. Four groups of diverters and Laval nozzles are arranged. The four groups of diverters are equidistantly arranged around the air bag and one end of each of them is fixedly connected to the air bag. The four groups of Laval nozzles are divided into They are fixedly connected with one end of the four groups of shunt pipes away from the air bag, and one end of the four groups of Laval nozzles away from the shunt pipes is fixedly connected with the crushing bin. The discharge port passes through the outer wall of the grading bin and is fixedly connected with the grading bin. The grading motor is fixedly connected to the side of the grading bin facing away from the discharge port and is arranged opposite to the discharge port. The grading motor shaft is rotatably connected with the grading bin and passes through the grading bin. The grading turbine is arranged in the grading bin and rotatably sleeved on the end of the discharge port. The grading turbine is fixedly connected to the grading motor shaft on the side close to the grading motor. The feeding mechanism comprises a feeding pipe, a feeding motor and a feeding screw. The feeding pipe is horizontally arranged and fixedly connected to the side wall of the crushing bin. The feeding motor is fixedly connected to an end of the feeding pipe away from the crushing bin. The feeding motor passes through the feeding pipe and is rotatably connected to the feeding pipe. The feeding screw is rotatably arranged in the feeding pipe. The feeding screw shaft is fixedly connected to the feeding motor shaft. The material dropping mechanism includes a material dropping bin, an ash discharge hopper, a secondary support, a rotating cage, a material dropping plate and a brush plate. The material dropping bin is arranged above the feeding pipe and a feeding port is provided on the top thereof. The ash discharge hopper is fixedly connected to the side wall of the material dropping bin and its air outlet is located close to the top of the material dropping bin. Four groups of secondary supports are fixedly connected to the bottom of the material dropping bin. The rotating cage is rotatably arranged in the material dropping bin and its bottom is bucket-shaped. The bottom of the rotating cage passes through the material dropping bin and is rotatably connected to the material dropping bin. The bottom end of the material dropping bin is rotatably connected to the feeding pipe. The filter screen is fixedly connected to the side of the rotating cage, and eight groups of blanking plates are equidistant and inclined along the vertical direction on the inner side of the rotating cage. The eight groups of blanking plates are fixedly connected to the rotating cage, among which four groups of blanking plates are inclined toward the lower side facing away from the ash discharge hopper, and the other four groups of blanking plates are inclined toward the lower side facing the ash discharge hopper. The four groups of blanking plates inclined toward the lower side of the ash discharge hopper and the four groups of blanking plates inclined toward the lower side facing away from the ash discharge hopper are arranged alternately, and the brush plate is fixedly connected to the inner wall of the blanking bin, and the brush plate has bristles close to the rotating cage on the side thereof with a length capable of touching the filter screen; The air supply and dust removal mechanism comprises a shell, a three-stage column, a core column, a servo drive motor, a synchronous wheel, a primary arc-shaped air bin, a secondary arc-shaped air bin and a blower. The shell is arranged on the side of the blanking bin facing away from the ash discharge hopper and is located above the conveying pipe. The three-stage column is fixedly connected with four groups at the bottom of the shell. The core column is rotatably arranged in the shell and matches the size of the shell. The top and bottom of the core column both have a rotating shaft. The rotating shafts at the top and bottom of the core column both penetrate the shell and are rotatably connected to the shell. The servo drive motor is fixedly connected to the top of the shell. The rotating shaft of the servo drive motor is fixedly connected to the rotating shaft of the core column. Two groups of synchronous wheels are arranged, one group of which is arranged below the shell and fixedly connected to the rotating shaft of the core column, and the other group of synchronous wheels is arranged below the blanking bin and fixedly sleeved on the outside of the rotating cage. The two groups of synchronous wheels are connected by synchronous belt transmission. Four groups of the primary arc-shaped air bin and the secondary arc-shaped air bin are arranged in the blanking bin. The eight groups of blanking plates are respectively connected to the four groups of primary arc-shaped air bins, the four groups of The secondary arc-shaped air bins are opposite to each other, the four groups of the primary arc-shaped air bins and the four groups of the secondary arc-shaped air bins are alternately arranged in the vertical direction, the four groups of the primary arc-shaped air bins and the four groups of the secondary arc-shaped air bins are provided with air supply ports on the side close to the rotating cage, the four groups of the primary arc-shaped air bins and the four groups of the secondary arc-shaped air bins are fixedly connected with air supply pipes on the side close to the shell, the eight groups of the air supply pipes all pass through the blanking bin and are fixedly connected to the blanking bin, the ends of the eight groups of the air supply pipes away from the blanking bin are fixedly connected to the shell, and the outer side of the core column is opened A primary air duct and a secondary air duct are provided, the primary air duct and the secondary air duct are spaced 180° apart, the primary air duct can be communicated with four groups of primary arc-shaped air bins at the same time, the secondary air duct can be communicated with four groups of secondary arc-shaped air bins at the same time, the blower is fixedly connected to the side wall of the shell, the blower outlet is fixedly connected to the shell, the blower can be connected with the primary air duct when the primary air duct and the four groups of primary arc-shaped air bins are connected, and can be connected with the secondary air duct when the secondary air duct and the four groups of secondary arc-shaped air bins are connected; Among them, when the blower, the primary air duct and the four groups of primary arc-shaped air bins are connected, the four groups of primary arc-shaped air bins are respectively facing four groups of drop plates inclined downwardly away from the ash discharge hopper.

[0007] As a preferred solution of the air flow mill for silver powder production described in the present invention, the four groups of primary pillars, the four groups of tertiary pillars and the four groups of secondary pillars are all distributed in a rectangular shape.

[0008] As a preferred embodiment of the air flow pulverizer for silver powder production described in the present invention, the feeding mechanism further includes a fixed plate and two groups of support plates, the fixed plate is fixedly connected to four groups of secondary pillars and is arranged below the feed pipe, the two groups of support plates are fixedly connected to the top of the fixed plate, and the tops of the two groups of support plates are fixedly connected to the feed pipe.

[0009] As a preferred solution of the air flow mill for silver powder production described in the present invention, the fixed plate and the two groups of support plates are both made of stainless steel, and the two groups of fixed plates are symmetrically arranged on the top of the support plate.

[0010] As a preferred embodiment of the air flow pulverizer for silver powder production described in the present invention, the bristles of the brush plate are stainless steel bristles.

[0011] As a preferred embodiment of the air flow pulverizer for silver powder production described in the present invention, the blanking mechanism also includes a limit block, a limit groove is provided on the top of the side wall of the rotating cage in the horizontal direction, the curvature of the limit groove is 180°, the limit block is fixedly connected to the inner wall of the blanking bin and inserted into the limit groove, when the blower, the primary air duct and the four groups of primary arc-shaped air bins are connected, the limit block is located at one end of the limit groove, and when the blower, the secondary air duct and the four groups of secondary arc-shaped air bins are connected, the limit block is located at the other end of the limit groove.

[0012] As a preferred embodiment of the air flow mill for silver powder production described in the present invention, both sides of the blanking plate that are misaligned with the air supply port of the first-level arc-shaped air bin or the second-level arc-shaped air bin are bent upward.

[0013] As a preferred solution of the air flow mill for silver powder production described in the present invention, the blanking plate is made of stainless steel and has a smooth surface.

[0014] As a preferred embodiment of the air flow mill for silver powder production described in the present invention, the feed pipe, feed bin, ash discharge hopper and shell are all made of stainless steel, and the surfaces of the feed pipe, feed bin, ash discharge hopper and shell are also coated with anti-corrosion paint.

[0015] The present invention also provides a method for producing silver powder, which uses the above-mentioned air flow mill for producing silver powder, and comprises the following steps: S1, in the initial state, the blower, the primary air duct and the four groups of primary arc-shaped air bins are connected, and the silver particles are fed into the bin through the feeding port of the bin. After entering the bin, the silver particles slide down along the eight groups of blanking plates in sequence and fall into the feeding pipe; S2, the blower blows air into the four groups of first-level arc-shaped air bins through the first-level air duct, and the air flows through the air supply ports of the four groups of first-level arc-shaped air bins to the four groups of corresponding blanking plates, and then flows to the outlet of the ash discharge hopper obliquely upward after being guided by the four groups of blanking plates. The silver particles slide against the wind on these four groups of blanking plates, and the air flow removes the dust on the surface of the silver particles. When the silver particles fall, they collide with the blanking plates and the dust is also shaken out, and the dust is taken away by the air flow; S3, the feeding motor drives the feeding screw to rotate, and the silver particles after dust removal enter the feeding pipe and enter the crushing bin under the conveyance of the feeding screw. The airflow is input into the air bag through the blasting device and the air inlet. The airflow passes through four groups of manifolds and then is accelerated and ejected through four groups of Laval nozzles. The silver particles entering the crushing bin collide with each other and are crushed under the action of the airflow. The silver powder moves upward under the action of the airflow. The grading motor drives the grading turbine to rotate. The grading turbine sorts the silver powder. The large-sized silver particles are screened out under the action of centrifugal force and fall back to the bottom of the crushing bin to continue to be crushed. The fine silver powder is output to the next process through the grading turbine and the discharge port; S4, after a period of continuous operation, the servo drive motor drives the core column to rotate 180°, so that the blower, the secondary air duct and the four groups of secondary arc-shaped air bins are connected. When the core column rotates, the cage is driven to rotate synchronously under the transmission of the two groups of synchronous wheels and the synchronous belt. The cage rotates 180°, and each group of blanking plates also rotates 180°. When the cage rotates, the bristles of the brush plate clean the filter screen and brush off the irregular or burred silver particles hanging on the filter screen. The blower continues to supply air. At this time, the airflow passes through the air supply ports of the four groups of secondary arc-shaped air bins and blows to the four groups of corresponding blanking plates. After being guided by the four groups of blanking plates, it flows to the outlet of the ash discharge hopper obliquely above. The silver particles slide against the wind on these four groups of blanking plates, and the airflow takes out the dust on the surface of the silver particles; S5, after continuing the operation for a period of time, the servo drive motor drives the core column to rotate 180 degrees, and this reciprocating process continues to process the silver powder.

[0016] The beneficial effects of the present invention are as follows: by arranging a blanking mechanism in cooperation with an air supply and dust removal mechanism, dust and other impurities on the surface of the silver particles can be cleaned before entering the crushing bin, which is beneficial to improving the quality of the silver powder. The rotating cage can rotate 180°, and the brush plate can prevent the filter from being blocked by irregular-shaped or burred silver particles. The rotating cage rotates 180° to switch the air outlet of the first-level arc air bin or the second-level arc air bin, and the blanking plate is used to ensure that the airflow in the blanking bin flows toward the ash hopper outlet, and the silver particles slide downward against the wind, thereby ensuring the dust removal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them: Figure 1 The figure is a three-dimensional structural schematic diagram of a jet mill for producing silver powder according to the present invention.

[0018] Figure 2 The present invention is a schematic diagram of the vertical section structure of the drop bin portion of a jet mill for silver powder production.

[0019] Figure 3 The present invention is a schematic diagram of the cross-sectional structure of the drop bin portion of a jet mill for producing silver powder.

[0020] Figure 4 For the present invention Figure 3 A magnified view of the structure of area A.

[0021] Figure 5 The present invention is a schematic diagram of a vertical section structure of a portion of an air supply and dust removal mechanism of an air flow pulverizer for silver powder production.

[0022] Figure 6 The present invention is a schematic diagram of the three-dimensional structure of the rotating cage part of the air flow mill for silver powder production.

[0023] Figure 7 The present invention is a schematic diagram of the three-dimensional structure of the core column part of a jet mill for producing silver powder.

[0024] Figure 8 The present invention is a schematic diagram of the air supply and dust removal state of an air flow pulverizer for silver powder production.

[0025] Description of the drawings: 100, main body; 101, crushing bin; 102, primary support; 103, grading bin; 104, air bag; 105, air inlet; 106, diverter pipe; 107, Laval nozzle; 108, discharge port; 109, grading motor; 110, grading turbine; 200, feeding mechanism; 201, feeding pipe; 202, feeding motor; 203, feeding screw; 204, fixing plate; 205, support plate; 300, dropping mechanism; 301, dropping Silo; 302, ash hopper; 303, secondary support; 304, rotating cage; 304a, limiting groove; 305, drop plate; 306, brush plate; 307, limiting block; 400, air supply and dust removal mechanism; 401, shell; 402, third-level column; 403, core column; 403a, primary air duct; 403b, secondary air duct; 404, servo drive motor; 405, synchronous wheel; 406, primary arc air silo; 407, secondary arc air silo; 408, blower. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0027] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0029] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included. Example 1

[0030] A jet mill for producing silver powder, comprising: The main body 100 includes a crushing bin 101, a primary support 102, a grading bin 103, an air bag 104, an air inlet 105, a shunt pipe 106, a Laval nozzle 107, a discharge port 108, a grading motor 109 and a grading turbine 110. The primary support 102 is fixedly connected to the bottom of the crushing bin 101 in four groups. The grading bin 103 is fixedly connected to the top of the crushing bin 101. The air bag 104 is annular and fixedly sleeved on the outside of the crushing bin 101. The air inlet 105 is fixedly connected to the side wall of the air bag 104. Four groups of shunt pipes 106 and Laval nozzles 107 are provided. The four groups of shunt pipes 106 are equidistantly arranged around the air bag 104 and one end of each of them is fixedly connected to the air bag 104. The four groups of Laval nozzles 109 are fixedly connected to the air bag 104. The pipe 107 is fixedly connected to one end of the four groups of shunt pipes 106 away from the air bag 104, and one end of the four groups of Laval nozzles 107 away from the shunt pipe 106 is fixedly connected to the crushing bin 101. The discharge port 108 passes through the outer wall of the grading bin 103 and is fixedly connected to the grading bin 103. The grading motor 109 is fixedly connected to the side of the grading bin 103 facing away from the discharge port 108 and is arranged opposite to the discharge port 108. The rotating shaft of the grading motor 109 is rotatably connected to the grading bin 103 and passes through the grading bin 103. The grading turbine 110 is arranged in the grading bin 103 and is rotatably sleeved on the end of the discharge port 108. The side of the grading turbine 110 close to the grading motor 109 is fixedly connected to the rotating shaft of the grading motor 109. The feeding mechanism 200 includes a feeding pipe 201, a feeding motor 202 and a feeding screw 203. The feeding pipe 201 is horizontally arranged and fixedly connected to the side wall of the crushing bin 101. The feeding motor 202 is fixedly connected to one end of the feeding pipe 201 away from the crushing bin 101. The feeding motor 202 penetrates the feeding pipe 201 and is rotatably connected to the feeding pipe 201. The feeding screw 203 is rotatably arranged in the feeding pipe 201, and the rotating shaft of the feeding screw 203 is fixedly connected to the rotating shaft of the feeding motor 202. The material dropping mechanism 300 includes a material dropping bin 301, an ash discharge hopper 302, a secondary support 303, a rotating cage 304, a material dropping plate 305 and a brush plate 306. The material dropping bin 301 is arranged above the feeding pipe 201 and has a feeding port on its top. The ash discharge hopper 302 is fixedly connected to the side wall of the material dropping bin 301 and its air outlet is located near the top of the material dropping bin 301. Four groups of secondary support 303 are fixedly connected to the bottom of the material dropping bin 301. The rotating cage 304 is rotatably arranged in the material dropping bin 301 and has a bucket-shaped bottom. The bottom of the rotating cage 304 passes through the material dropping bin 301 and is rotatably connected to the material dropping bin 301. The bottom end of the material dropping bin 301 is rotatably connected to the feeding pipe 201. The inner side of the rotating cage 304 is fixedly connected to the filter screen, and eight groups of blanking plates 305 are equidistantly and obliquely arranged on the inner side of the rotating cage 304 along the vertical direction. The eight groups of blanking plates 305 are all fixedly connected to the rotating cage 304, among which four groups of blanking plates 305 are inclined downwardly in the direction away from the ash discharge hopper 302, and the other four groups of blanking plates 305 are inclined downwardly in the direction of the ash discharge hopper 302. The four groups of blanking plates 305 inclined downwardly in the direction of the ash discharge hopper 302 and the four groups of blanking plates 305 inclined downwardly in the direction away from the ash discharge hopper 302 are alternately arranged, and the brush plate 306 is fixedly connected to the inner wall of the blanking bin 301, and the side of the brush plate 306 close to the rotating cage 304 has bristles long enough to touch the filter screen; The air supply and dust removal mechanism 400 includes a shell 401, a three-stage column 402, a core column 403, a servo drive motor 404, a synchronous wheel 405, a first-stage arc-shaped air bin 406, a second-stage arc-shaped air bin 407 and a blower 408. The shell 401 is arranged on the side of the drop bin 301 facing away from the ash discharge hopper 302 and is located above the feed pipe 201. The three-stage column 402 is fixedly connected to four groups at the bottom of the shell 401. The core column 403 is rotatably arranged in the shell 401 and is in accordance with the size of the shell 401. The top and bottom of the core column 403 are provided with a rotating shaft. The rotating shafts at the top and bottom of the core column 403 penetrate the shell 401 and are connected to the shell. 401 is rotatably connected, a servo drive motor 404 is fixedly connected to the top of the shell 401, a rotating shaft of the servo drive motor 404 is fixedly connected to the rotating shaft of the core column 403, two groups of synchronous wheels 405 are provided, one group of synchronous wheels 405 is provided below the shell 401 and is fixedly connected to the rotating shaft of the core column 403, another group of synchronous wheels 405 is provided below the blanking bin 301 and is fixedly sleeved on the outside of the rotating cage 304, the two groups of synchronous wheels 405 are connected through synchronous belt transmission, four groups of primary arc-shaped air bins 406 and secondary arc-shaped air bins 407 are provided in the blanking bin 301, and eight groups of blanking plates 305 are respectively connected to the four groups of primary arc-shaped air bins 40 6. Four groups of secondary arc-shaped air bins 407 are opposite to each other, four groups of primary arc-shaped air bins 406 and four groups of secondary arc-shaped air bins 407 are arranged alternately in the vertical direction, and air supply ports are provided on the side of the four groups of primary arc-shaped air bins 406 and four groups of secondary arc-shaped air bins 407 close to the rotating cage 304, and air supply pipes are fixedly connected to the side of the four groups of primary arc-shaped air bins 406 and four groups of secondary arc-shaped air bins 407 close to the shell 401, and eight groups of air supply pipes all penetrate the blanking bin 301 and are fixedly connected to the blanking bin 301, and the ends of the eight groups of air supply pipes away from the blanking bin 301 are fixedly connected to the shell 401, and a primary air duct 403a is provided on the outside of the core column 403 and a secondary air duct 403b, the interval between the primary air duct 403a and the secondary air duct 403b is 180°, the primary air duct 403a can be communicated with four groups of primary arc-shaped air bins 406 at the same time, the secondary air duct 403b can be communicated with four groups of secondary arc-shaped air bins 407 at the same time, the blower 408 is fixedly connected to the side wall of the shell 401, the air outlet of the blower 408 is fixedly communicated with the shell 401, the blower 408 can be communicated with the primary air duct 403a when the primary air duct 403a and the four groups of primary arc-shaped air bins 406 are connected, and can be communicated with the secondary air duct 403b when the secondary air duct 403b and the four groups of secondary arc-shaped air bins 407 are connected; Among them, when the blower 408, the first-level air duct 403a are connected with the four groups of first-level arc-shaped air bins 406, the four groups of first-level arc-shaped air bins 406 are respectively facing the four groups of blanking plates 305 inclined downwardly away from the ash hopper 302, and the bristles of the brush plate 306 are stainless steel bristles. The stainless steel bristles are corrosion-resistant and have high toughness, which can ensure that the silver particles on the filter net are removed.

[0031] In addition, the four groups of primary pillars 102, the four groups of third-level pillars 402 and the four groups of secondary pillars 303 are all distributed in a rectangular shape to ensure support stability.

[0032] In addition, the feeding mechanism 200 also includes a fixed plate 204 and two groups of support plates 205. The fixed plate 204 is fixedly connected to four groups of secondary pillars 303 and is arranged below the feed pipe 201. The two groups of support plates 205 are fixedly connected to the top of the fixed plate 204. The tops of the two groups of support plates 205 are fixedly connected to the feed pipe 201. The fixed plate 204 and the two groups of support plates 205 are used to ensure the stability of the feed pipe 201 and improve the structural strength of the device.

[0033] Specifically, the blanking mechanism 300 also includes a limit block 307. A limit groove 304a is provided on the top of the side wall of the rotating cage 304 in the horizontal direction. The curvature of the limit groove 304a is 180°. The limit block 307 is fixedly connected to the inner wall of the blanking bin 301 and inserted into the limit groove 304a. When the blower 408 and the first-level air duct 403a are connected with the four groups of first-level arc-shaped air bins 406, the limit block 307 is located at one end of the limit groove 304a. When the blower 408 and the second-level air duct 403b are connected with the four groups of second-level arc-shaped air bins 407, the limit block 307 is located at the other end of the limit groove 304a. The limit block 307 cooperates with the limit groove 304a to limit the device to avoid misalignment of the blanking plate 305 with the first-level arc-shaped air bin 406 or the second-level arc-shaped air bin 407.

[0034] It should be noted that the two sides of the blanking plate 305 that are misaligned with the air supply port of the first-level arc-shaped air bin 406 or the second-level arc-shaped air bin 407 are bent upward to prevent the silver particles from sliding to both sides. The surface of the blanking plate 305 is smooth, which can reduce the friction with the silver particles and ensure that the silver particles slide downward smoothly. The blanking plate 305 is made of stainless steel, and the feed pipe 201, the feed bin 301, the ash hopper 302 and the shell 401 are all made of stainless steel. The stainless steel material is corrosion-resistant, and the surfaces of the feed pipe 201, the feed bin 301, the ash hopper 302 and the shell 401 are also coated with anti-corrosion paint, which is used to further improve the anti-corrosion performance. Example 2

[0035] A method for producing silver powder, using the airflow pulverizer for silver powder production in Example 1, comprising the following steps: S1, in the initial state, the blower 408, the primary air duct 403a and the four groups of primary arc-shaped air bins 406 are connected, and the silver particles are input into the material bin 301 through the feeding port of the material bin 301. After entering the material bin 301, the silver particles slide down along the eight groups of material blanking plates 305 in sequence and then fall into the feeding pipe 201; S2, the blower 408 blows air into the four groups of primary arc-shaped air bins 406 through the primary air duct 403a, and the air flows through the air supply ports of the four groups of primary arc-shaped air bins 406 to the four groups of corresponding blanking plates 305, and then flows to the outlet of the ash discharge hopper 302 obliquely upward after being guided by the four groups of blanking plates 305. The silver particles slide against the wind on the four groups of blanking plates 305, and the air flow removes the dust on the surface of the silver particles. When the silver particles fall, they collide with the blanking plates 305, and the dust is also shaken out, and the dust is taken away by the air flow; S3, the feeding motor 202 drives the feeding screw 203 to rotate, and the silver particles after dust removal enter the feeding pipe 201 and enter the crushing bin 101 under the conveyance of the feeding screw 203. The airflow is input into the air bag 104 through the blasting device and the air inlet 105. The airflow passes through the four groups of manifolds 106 and then is accelerated and ejected through the four groups of Laval nozzles 107. The silver particles entering the crushing bin 101 collide with each other and are crushed under the action of the airflow. The silver powder moves upward under the action of the airflow. The grading motor 109 drives the grading turbine 110 to rotate. The grading turbine 110 sorts the silver powder. The large-sized silver particles are screened out under the action of centrifugal force and fall back to the bottom of the crushing bin 101 to continue to be crushed. The fine silver powder is output to the next process through the grading turbine 110 and the discharge port 108. S4, after a period of continuous operation, the servo drive motor 404 drives the core column 403 to rotate 180°, so that the blower 408, the secondary air duct 403b are connected with the four groups of secondary arc-shaped air warehouses 407. When the core column 403 rotates, the two groups of synchronous wheels 405 and the synchronous belt drive the cage 304 to rotate synchronously. The cage 304 rotates 180°, and each group of blanking plates 305 also rotates 180°. When the cage 304 rotates, the bristles of the brush plate 306 clean the filter screen and brush off the silver particles with special shapes or burrs hanging on the filter screen. The blower 408 continues to supply air. At this time, the airflow passes through the air supply ports of the four groups of secondary arc-shaped air warehouses 407 and blows to the four groups of corresponding blanking plates 305. After being guided by the four groups of blanking plates 305, it flows to the outlet of the ash discharge hopper 302 obliquely above. The silver particles slide against the wind on these four groups of blanking plates 305, and the airflow takes out the dust on the surface of the silver particles. S5, after continuing the operation for a period of time, the servo drive motor 404 drives the core column 403 to rotate 180 degrees, and this reciprocating process continues to process the silver powder.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A jet mill for silver powder production, characterized in that: include: The main body (100) comprises a crushing bin (101), a primary support (102), a grading bin (103), an air bag (104), an air inlet (105), a diverter pipe (106), a Laval nozzle (107), a discharge port (108), a grading motor (109) and a grading turbine (110), wherein four groups of the primary support (102) are fixedly connected to the bottom of the crushing bin (101), the grading bin (103) is fixedly connected to the top of the crushing bin (101), the air bag (104) is annular and is fixedly sleeved on the outside of the crushing bin (101), the air inlet (105) is fixedly connected to the side wall of the air bag (104), four groups of the diverter pipe (106) and the Laval nozzle (107) are each provided, the four groups of the diverter pipe (106) are equidistantly arranged around the air bag (104) and one end of each of the four groups of the Laval nozzle (107) is fixedly connected to the air bag (104), and the four groups of the Laval nozzle (107) are fixedly connected to the air bag (104). The Laval nozzles (107) are respectively fixedly connected to one end of the four groups of flow distribution pipes (106) away from the air bag (104); one end of the four groups of Laval nozzles (107) away from the flow distribution pipes (106) are all fixedly connected to the crushing bin (101); the discharge port (108) penetrates the outer wall of the grading bin (103) and is fixedly connected to the grading bin (103); the grading motor (109) is fixedly connected to the side of the grading bin (103) facing away from the discharge port (108) and is arranged opposite to the discharge port (108); the rotating shaft of the grading motor (109) is rotatably connected to the grading bin (103) and penetrates the grading bin (103); the grading turbine (110) is arranged in the grading bin (103) and is rotatably sleeved on the end of the discharge port (108); the side of the grading turbine (110) close to the grading motor (109) is fixedly connected to the rotating shaft of the grading motor (109); A feeding mechanism (200) comprising a feeding pipe (201), a feeding motor (202) and a feeding screw (203); the feeding pipe (201) is arranged horizontally and is fixedly connected to a side wall of a crushing bin (101); the feeding motor (202) is fixedly connected to an end of the feeding pipe (201) away from the crushing bin (101); the feeding motor (202) passes through the feeding pipe (201) and is rotatably connected to the feeding pipe (201); the feeding screw (203) is rotatably arranged in the feeding pipe (201); and the rotating shaft of the feeding screw (203) is fixedly connected to the rotating shaft of the feeding motor (202); The material dropping mechanism (300) comprises a material dropping bin (301), an ash discharge hopper (302), secondary pillars (303), a rotating cage (304), a material dropping plate (305) and a brush plate (306); the material dropping bin (301) is arranged above the feeding pipe (201) and has a feeding port at its top; the ash discharge hopper (302) is fixedly connected to the side wall of the material dropping bin (301) and has an air outlet located close to the top of the material dropping bin (301); four groups of secondary pillars (303) are fixedly connected to the bottom of the material dropping bin (301); the rotating cage (304) is rotatably arranged in the material dropping bin (301) and has a bucket-shaped bottom; the bottom of the rotating cage (304) passes through the material dropping bin (301) and is rotatably connected to the material dropping bin (301); the bottom end of the material dropping bin (301) is rotatably connected to the feeding pipe (201); The inner side of the rotating cage (304) is fixedly connected to the filter screen, and eight groups of blanking plates (305) are equidistantly and obliquely arranged on the inner side of the rotating cage (304) along the vertical direction. The eight groups of blanking plates (305) are all fixedly connected to the rotating cage (304), of which four groups of blanking plates (305) are inclined downward in the direction opposite to the ash discharge hopper (302), and the other four groups of blanking plates (305) are inclined downward in the direction opposite to the ash discharge hopper (302). The four groups of blanking plates (305) inclined downward in the direction opposite to the ash discharge hopper (302) and the four groups of blanking plates (305) inclined downward in the direction opposite to the ash discharge hopper (302) are arranged alternately, and the brush plate (306) is fixedly connected to the inner wall of the blanking bin (301), and the brush plate (306) has bristles of a length capable of touching the filter screen on a side close to the rotating cage (304); The air supply and dust removal mechanism (400) comprises a shell (401), three-stage columns (402), a core column (403), a servo drive motor (404), a synchronous wheel (405), a primary arc-shaped air bin (406), a secondary arc-shaped air bin (407) and a blower (408); the shell (401) is arranged on a side of a material drop bin (301) facing away from an ash discharge hopper (302) and is located above a material delivery pipe (201); four groups of three-stage columns (402) are fixedly connected to the bottom of the shell (401); the core column (403) is rotatably arranged in the shell (401) and matches the size of the shell (401); the top and bottom of the core column (403) both have a rotating shaft; the rotating shafts at the top and bottom of the core column (403) are connected to the housing (401) and the housing (401) is ... Both penetrate the shell (401) and are rotatably connected to the shell (401); the servo drive motor (404) is fixedly connected to the top of the shell (401); the rotating shaft of the servo drive motor (404) is fixedly connected to the rotating shaft of the core column (403); two groups of synchronous wheels (405) are provided, one group of which is provided below the shell (401) and is fixedly connected to the rotating shaft of the core column (403); the other group of synchronous wheels (405) is provided below the blanking bin (301) and is fixedly sleeved on the outside of the rotating cage (304); the two groups of synchronous wheels (405) are connected by synchronous belt transmission; four groups of the first-level arc-shaped air bin (406) and the second-level arc-shaped air bin (407) are provided in the blanking bin (301); The eight groups of blanking plates (305) are respectively opposite to the four groups of primary arc-shaped air bins (406) and the four groups of secondary arc-shaped air bins (407), and the four groups of primary arc-shaped air bins (406) and the four groups of secondary arc-shaped air bins (407) are alternately arranged in the vertical direction. The four groups of primary arc-shaped air bins (406) and the four groups of secondary arc-shaped air bins (407) are provided with air supply ports on one side close to the rotating cage (304). The four groups of primary arc-shaped air bins (406) and the four groups of secondary arc-shaped air bins (407) are fixedly connected to the shell (401) with air supply pipes. The eight groups of air supply pipes all penetrate the blanking bin (301) and are fixedly connected to the blanking bin (301). One end of the eight groups of air supply pipes away from the blanking bin (301) is connected to the shell (401). 1) fixedly connected, a primary air duct (403a) and a secondary air duct (403b) are provided on the outer side of the core column (403), the primary air duct (403a) and the secondary air duct (403b) are spaced 180 degrees apart, the primary air duct (403a) can be connected to four groups of primary arc-shaped air bins (406) at the same time, the secondary air duct (403b) can be connected to four groups of secondary arc-shaped air bins (407) at the same time, the blower (408) is fixedly connected to the side wall of the shell (401), the air outlet of the blower (408) is fixedly connected to the shell (401), and the blower (408) can be connected to the primary air duct (403a) when the primary air duct (403a) and the four groups of primary arc-shaped air bins (406) are connected,When the secondary air duct (403b) and the four sets of secondary arc-shaped air chambers (407) are connected, they are connected to the secondary air duct (403b); When the blower (408), the primary air duct (403a) and the four groups of primary arc-shaped air bins (406) are connected, the four groups of primary arc-shaped air bins (406) are respectively facing four groups of drop plates (305) that are tilted downwardly in a direction away from the ash discharge hopper (302).

2. The air flow mill for silver powder production according to claim 1, characterized in that: The four groups of first-level pillars (102), the four groups of third-level pillars (402), and the four groups of second-level pillars (303) are all distributed in a rectangular shape.

3. A jet mill for silver powder production according to claim 1 or 2, characterized in that: The feeding mechanism (200) further comprises a fixed plate (204) and two groups of support plates (205); the fixed plate (204) is fixedly connected to four groups of secondary pillars (303) and is arranged below the feeding pipe (201); the two groups of support plates (205) are fixedly connected to the top of the fixed plate (204); and the tops of the two groups of support plates (205) are fixedly connected to the feeding pipe (201).

4. The air flow mill for silver powder production according to claim 3, characterized in that: The fixing plate (204) and the two groups of support plates (205) are both made of stainless steel material, and the two groups of fixing plates (204) are symmetrically arranged at the top of the support plates (205).

5. The air flow mill for silver powder production according to claim 1, characterized in that: The bristles of the brush plate (306) are stainless steel bristles.

6. The air flow mill for silver powder production according to claim 1, characterized in that: The blanking mechanism (300) further comprises a limit block (307); a limit groove (304a) is provided at the top of the side wall of the rotating cage (304) in the horizontal direction; the limit groove (304a) has an arc of 180°; the limit block (307) is fixedly connected to the inner wall of the blanking bin (301) and inserted into the limit groove (304a); when the blower (408), the primary air duct (403a) and the four groups of primary arc-shaped air bins (406) are connected, the limit block (307) is located at one end of the limit groove (304a); when the blower (408), the secondary air duct (403b) and the four groups of secondary arc-shaped air bins (407) are connected, the limit block (307) is located at the other end of the limit groove (304a).

7. The air flow mill for silver powder production according to claim 1, characterized in that: Both sides of the blanking plate (305) that are misaligned with the air supply port of the first-stage arc-shaped air bin (406) or the second-stage arc-shaped air bin (407) are bent upwards.

8. The air flow mill for silver powder production according to claim 7, characterized in that: The blanking plate (305) is made of stainless steel, and the surface of the blanking plate (305) is smooth.

9. The air flow mill for silver powder production according to claim 1, characterized in that: The material conveying pipe (201), the material dropping bin (301), the ash discharge hopper (302) and the shell (401) are all made of stainless steel material, and the surfaces of the material conveying pipe (201), the material dropping bin (301), the ash discharge hopper (302) and the shell (401) are also coated with anti-corrosion paint.

10. A method for producing silver powder, using the air flow mill for producing silver powder according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, in the initial state, the blower (408), the primary air duct (403a) and the four groups of primary arc-shaped air bins (406) are connected to input the silver particles into the material bin (301) through the feeding port of the material bin (301). After entering the material bin (301), the silver particles slide down along the eight groups of material bin plates (305) in sequence and then fall into the feeding pipe (201); S2, the blower (408) blows air into the four groups of primary arc-shaped air bins (406) through the primary air duct (403a), and the air flow is blown toward the four groups of corresponding blanking plates (305) through the air supply ports of the four groups of primary arc-shaped air bins (406), and then flows toward the outlet of the dust discharge hopper (302) obliquely upward after being guided by the four groups of blanking plates (305). The silver particles slide against the wind on the four groups of blanking plates (305), and the air flow removes the dust on the surface of the silver particles. When the silver particles fall, they collide with the blanking plates (305), and the dust is also shaken out, and the dust is taken away by the air flow; S3, the feeding motor (202) drives the feeding screw (203) to rotate, and the silver particles after dust removal enter the feeding pipe (201) and enter the crushing bin (101) under the conveyance of the feeding screw (203). The airflow is input into the air bag (104) through the air blowing device and the air inlet (105). The airflow passes through four groups of manifolds (106) and then is accelerated and ejected through four groups of Laval nozzles (107). The silver particles entering the crushing bin (101) collide with each other and are crushed under the action of the airflow. The silver powder moves upward under the action of the airflow. The classification motor (109) drives the classification turbine (110) to rotate. The classification turbine (110) classifies the silver powder. Large-sized silver particles are screened out under the action of centrifugal force and fall back to the bottom of the crushing bin (101) to continue to be crushed. The fine silver powder is output to the next process through the classification turbine (110) and the discharge port (108); S4, after the operation continues for a period of time, the servo drive motor (404) drives the core column (403) to rotate 180°, so that the blower (408), the secondary air duct (403b) and the four groups of secondary arc-shaped air chambers (407) are connected. When the core column (403) rotates, the rotating cage (304) is driven by the two groups of synchronous wheels (405) and the synchronous belt to rotate synchronously. The rotating cage (304) rotates 180°, and each group of blanking plates (305) also rotates 180°. The rotating cage (304) rotates When the brush plate (306) is in motion, the bristles of the brush plate (306) clean the filter screen and brush off the irregularly shaped or burred silver particles hanging on the filter screen. The blower (408) continues to supply air. At this time, the airflow passes through the air supply ports of the four groups of secondary arc-shaped air bins (407) and blows toward the four groups of corresponding blanking plates (305). After being guided by the four groups of blanking plates (305), the airflow flows toward the outlet of the dust discharge hopper (302) at an angle upward. The silver particles slide against the wind on the four groups of blanking plates (305), and the airflow removes the dust on the surface of the silver particles. S5, after continuing the operation for a period of time, the servo drive motor (404) drives the core column (403) to rotate 180 degrees, and the process is repeated to continue the silver powder processing.

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