A kind of air flow mill for silver powder production and silver powder production method thereof

Abstract

The invention discloses an air flow mill for silver powder production and a silver powder production method thereof. The air flow mill comprises: a main body, a feeding mechanism, a blanking mechanism and an air supply and dust removal mechanism. The main body comprises a crushing bin, a primary support, 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 support is fixedly connected with four groups at the bottom of the crushing bin, and the grading bin is fixedly connected to the top of the crushing bin. The beneficial effects are: by arranging the blanking mechanism and cooperating with the 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 degrees and cooperate with the brush plate to prevent the filter from being blocked by silver particles with special shapes or burrs. The rotating cage rotates 180 degrees to switch the air outlet of the primary arc air bin or the secondary arc air bin. The blanking plate is cooperated to ensure that the air flow 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.

Description

Technical Field

[0001] The present invention relates to the technical field of silver powder production, in particular to a jet mill 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. The airflow mill is a device that uses high-speed airflow to crush and classify materials. It has the characteristics of high efficiency, fineness and strong controllability. In the silver powder processing process, the airflow mill plays an important role. Through the airflow mill, the silver powder particles can be crushed to the required fineness, thereby improving the quality and application performance of the silver powder.

[0003] At present, when silver powder is processed by a jet mill, silver particles are generally poured directly into the hopper of the jet mill. Since silver particles have a high surface energy, they easily absorb particulate matter in the air, including dust and other impurities. If these impurities are not treated, the quality of the processed silver powder will be reduced. Therefore, a jet 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 the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not 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:

[0007] 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 the bottom of the crushing bin in four groups. 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. There are four groups of diverter pipes and Laval nozzles. The four groups of diverter pipes 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 respectively They are fixedly connected to one end of the four groups of diversion pipes away from the air bag, and one end of the four groups of Laval nozzles away from the diversion pipes is fixedly connected to the crushing bin. The discharge port passes through the outer wall of the grading bin and is fixedly connected to 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 to 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.

[0008] The feeding mechanism includes 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 the 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, and the feeding screw shaft is fixedly connected to the feeding motor shaft.

[0009] The blanking mechanism includes a blanking bin, an ash hopper, a secondary support, a rotating cage, a blanking plate and a brush plate. The blanking bin is arranged above the feeding pipe and a feeding port is provided on the top thereof. The ash hopper is fixedly connected to the side wall of the blanking bin and its air outlet is located near the top of the blanking bin. Four groups of secondary supports are fixedly connected to the bottom of the blanking bin. The rotating cage is rotatably arranged in the blanking bin and its bottom is bucket-shaped. The bottom of the rotating cage passes through the blanking bin and is rotatably connected to the blanking bin. The bottom end of the rotating cage is rotatably connected to the feeding pipe. The inner side of the rotating cage body The filter screen is fixedly connected, and eight groups of blanking plates are equidistant and inclined in the vertical direction on the inner side of the rotating cage. The eight groups of blanking plates are fixedly connected to the rotating cage, of 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 away from the ash discharge hopper. The four groups of blanking plates inclined toward the lower side facing away from the ash discharge hopper are alternately arranged with the four groups of blanking plates inclined toward the lower side facing away from the ash discharge hopper. The brush plate is fixedly connected to the inner wall of the blanking bin, and the side of the brush plate close to the rotating cage has bristles that are long enough to touch the filter screen.

[0010] 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 air bin, a secondary arc air bin and a blower. The shell is arranged on the side of the blanking bin facing away from the ash discharge hopper and above the conveying pipe. The three-stage column is fixedly connected to four groups at the bottom of the shell. The core column is rotatably arranged in the shell and fits the size of the shell. The top and bottom of the core column both have a rotating shaft, and the rotating shafts at the top and bottom of the core column both pass through the shell and are rotatably connected to the shell. The servo drive motor is fixedly connected to the top of the shell, and the servo drive motor shaft is fixedly connected to the core column shaft. The synchronous wheel is provided with two groups, one of which is provided under the shell and fixedly connected to the core column shaft, and the other group of synchronous wheels is provided under 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. The first-stage arc air bin and the second-stage arc air bin are both provided with four groups in the blanking bin, and the eight groups of blanking plates are respectively connected to the four groups of first-stage arc air bins, four groups of The secondary arc-shaped air bins are opposite to each other, and 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 air supply pipes all pass through the blanking bin and are fixedly connected to the blanking bin. The ends of the eight groups of air supply pipes away from the blanking bin are fixedly connected to the shell. 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 degrees apart, the primary air duct can be simultaneously communicated with four groups of primary arc-shaped air bins, the secondary air duct can be simultaneously communicated with four groups of secondary arc-shaped air bins, the blower is fixedly connected to the side wall of the shell, the blower outlet is fixedly communicated with the shell, the blower can be communicated 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 communicated with the secondary air duct when the secondary air duct and the four groups of secondary arc-shaped air bins are connected;

[0011] Among them, when the blower, the first-level air duct and the four groups of first-level arc-shaped air bins are connected, the four groups of first-level arc-shaped air bins are respectively facing four groups of blanking plates inclined downwardly away from the ash discharge hopper.

[0012] 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.

[0013] As a preferred solution of the air flow mill for silver powder production described in the present invention, the feeding mechanism also 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.

[0014] 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 plates.

[0015] As a preferred embodiment of the air flow mill for silver powder production described in the present invention, the bristles of the brush plate are stainless steel bristles.

[0016] As a preferred embodiment of the air flow mill for silver powder production described in the present invention, the blanking mechanism further comprises 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 first-level air duct and the four groups of first-level arc-shaped air bins are connected, the limit block is located at one end of the limit groove, and when the blower, the second-level air duct and the four groups of second-level arc-shaped air bins are connected, the limit block is located at the other end of the limit groove.

[0017] 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-stage arc-shaped air bin or the second-stage arc-shaped air bin are bent upward.

[0018] 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.

[0019] As a preferred embodiment of the air flow mill for silver powder production described in the present invention, the feed pipe, feed bin, ash hopper and shell are all made of stainless steel, and the surfaces of the feed pipe, feed bin, ash hopper and shell are also coated with anti-corrosion paint.

[0020] The present invention further provides a method for producing silver powder, which uses the above-mentioned air flow mill for silver powder production, comprising the following steps:

[0021] S1, in the initial state, the blower, the first-level air duct and the four groups of first-level arc-shaped air silos are connected, and the silver particles are fed into the blanking silo through the feeding port. After entering the blanking silo, the silver particles slide down along the eight groups of blanking plates in sequence and fall into the feeding pipe;

[0022] In step S2, the blower blows air into the four groups of first-level arc-shaped air silos through the first-level air duct. The air flows through the air supply ports of the four groups of first-level arc-shaped air silos and blows to the four corresponding blanking plates. After being guided by the four groups of blanking plates, it flows to the outlet of the dust discharge hopper obliquely above. The silver particles slide against the wind on these four groups of blanking plates. The airflow removes the dust on the surface of the silver particles. When the silver particles fall, they collide with the blanking plates, which also shakes out the dust, which is also carried away by the airflow.

[0023] In step S3, the feeding motor drives the feeding screw to rotate. The silver particles after dust removal enter the feeding pipe and are transported by the feeding screw into the crushing bin. The air flow is input into the air bag through the blower device and the air inlet. The air flow passes through four sets of manifolds and is accelerated and ejected through four sets of Laval nozzles. The silver particles entering the crushing bin collide with each other and are crushed under the action of the air flow. The silver powder moves upward under the action of the air flow. 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.

[0024] S4, after a period of continuous operation, the servo drive motor drives the core column to rotate 180 degrees, 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 two groups of synchronous wheels and the synchronous belt drive the rotating cage to rotate synchronously. The rotating cage rotates 180 degrees, and each group of blanking plates also rotates 180 degrees. When the rotating 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 air flow 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 hopper obliquely above. The silver particles slide against the wind on these four groups of blanking plates, and the air flow carries away the dust on the surface of the silver particles.

[0025] 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.

[0026] The beneficial effects of the present invention are as follows: by arranging a blanking mechanism in conjunction 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 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 cooperates with the blanking plate to ensure that the air flow in the blanking bin flows toward the ash hopper outlet, and makes the silver particles slide downward against the wind, thereby ensuring the dust removal effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0028] Figure 1 The figure is a schematic diagram of the three-dimensional structure of a jet mill for producing silver powder according to the present invention.

[0029] Figure 2The figure is a schematic diagram of the vertical cross-section structure of the discharge bin portion of a jet mill for silver powder production according to the present invention.

[0030] Figure 3 The figure is a schematic diagram of the transverse cross-section structure of the discharge bin portion of a jet mill for silver powder production according to the present invention.

[0031] Figure 4 For the present invention Figure 3 A magnified view of the structure of area A in the middle.

[0032] Figure 5 The figure is a schematic diagram of a vertical cross-section of the air supply and dust removal mechanism of a jet mill for silver powder production according to the present invention.

[0033] Figure 6 The figure is a schematic diagram of the three-dimensional structure of the rotating cage part of a jet mill for silver powder production according to the present invention.

[0034] Figure 7 This is a schematic diagram of the three-dimensional structure of the core column part of a jet mill for silver powder production according to the present invention.

[0035] Figure 8 This is a schematic diagram of the air supply and dust removal state of a jet mill for silver powder production according to the present invention.

[0036] Description of the drawings: 100, main body; 101, crushing chamber; 102, primary support; 103, grading chamber; 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 Material silo; 302, ash hopper; 303, secondary support; 304, rotating cage; 304a, limiting groove; 305, blanking plate; 306, brush plate; 307, limiting block; 400, air supply and dust removal mechanism; 401, shell; 402, tertiary 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

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. 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.

[0039] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0040] Furthermore, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing the embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included. Example 1

[0041] A jet mill for producing silver powder, comprising:

[0042] 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 diverter 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. There are four groups of diverter pipes 106 and Laval nozzles 107. The four groups of diverter 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 The pipes 107 are respectively fixedly connected to one end of the four groups of diverter pipes 106 away from the air bag 104, and the ends of the four groups of Laval nozzles 107 away from the diverter pipes 106 are all 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 rotatably sleeved on the end of the discharge port 108. The grading turbine 110 is fixedly connected to the rotating shaft of the grading motor 109 close to the grading motor 109.

[0043] The feeding mechanism 200 includes a feeding pipe 201, a feeding motor 202, and a feeding screw 203. The feeding pipe 201 is arranged horizontally and fixedly connected to the side wall of the crushing bin 101. The feeding motor 202 is fixedly connected to the 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.

[0044] The blanking mechanism 300 includes a blanking bin 301, an ash discharge hopper 302, a secondary support 303, a rotating cage 304, a blanking plate 305 and a brush plate 306. The blanking bin 301 is arranged above the feeding pipe 201 and a feeding port is opened on the top thereof. The ash discharge hopper 302 is fixedly connected to the side wall of the blanking bin 301 and its air outlet is located near the top of the blanking bin 301. Four groups of secondary supports 303 are fixedly connected to the bottom of the blanking bin 301. The rotating cage 304 is rotatably arranged in the blanking bin 301 and its bottom is bucket-shaped. The bottom of the rotating cage 304 passes through the blanking bin 301 and is rotatably connected to the blanking bin 301. The bottom end of the rotating cage 304 is rotatably connected to the feeding pipe 201. The inner side of the cage 304 is fixedly connected to the filter screen, and eight groups of blanking plates 305 are equidistant and inclined along the vertical direction on the inner side of the rotating cage 304. 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 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. The side of the brush plate 306 close to the rotating cage 304 has bristles long enough to touch the filter screen;

[0045] 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 hopper 302 and is located above the feed pipe 201. The three-stage column 402 is fixedly connected to the bottom of the shell 401 in four groups. The core column 403 is rotatably arranged in the shell 401 and fits 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 both pass through the shell 401 and are connected to the shell. 401 is rotated and connected, the servo drive motor 404 is fixedly connected to the top of the shell 401, the servo drive motor 404 shaft is fixedly connected to the core column 403 shaft, and two groups of synchronous wheels 405 are provided, one of which is provided below the shell 401 and fixedly connected to the core column 403 shaft, and the other group of synchronous wheels 405 is provided below the blanking bin 301 and fixedly sleeved on the outside of the rotating cage 304. The two groups of synchronous wheels 405 are connected by synchronous belt transmission. There are four groups of primary arc air bins 406 and secondary arc air bins 407 in the blanking bin 301, and the eight groups of blanking plates 305 are respectively connected to the four groups of primary arc air bins 40 6. Four groups of secondary curved air bins 407 are opposite each other, four groups of primary curved air bins 406 and four groups of secondary curved air bins 407 are arranged alternately in the vertical direction, and the four groups of primary curved air bins 406 and four groups of secondary curved air bins 407 are provided with air supply ports on the side close to the rotating cage 304. The four groups of primary curved air bins 406 and four groups of secondary curved air bins 407 are fixedly connected to the side close to the shell 401 with air supply pipes. The eight groups of air supply pipes all pass through the blanking bin 301 and are fixedly connected to the blanking bin 301. The ends of the eight groups of air supply pipes away from the blanking bin 301 are fixedly connected to the shell 401. The outer side of the core column 403 is provided with a primary air duct 403a. and the 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 the four groups of primary arc-shaped air storages 406 at the same time, and the secondary air duct 403b can be communicated with the four groups of secondary arc-shaped air storages 407 at the same time, the blower 408 is fixedly connected to the side wall of the shell 401, and the air outlet of the blower 408 is fixedly communicated with the shell 401, and 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 storages 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 storages 407 are connected;

[0046] Among them, when the blower 408, the first-level air duct 403a are connected to 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 tilted downwardly away from the ash hopper 302. 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.

[0047] In addition, 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 to ensure support stability.

[0048] 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 the 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.

[0049] 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, the first-level air duct 403a and the four groups of first-level 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 second-level air duct 403b and the four groups of second-level arc-shaped air bins 407 are connected, 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.

[0050] 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 between 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. Stainless steel is corrosion-resistant. 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

[0051] A method for producing silver powder, using the airflow mill for silver powder production in Example 1, comprising the following steps:

[0052] S1, in the initial state, the blower 408, the primary air duct 403a and the four sets of primary arc-shaped air bins 406 are connected, and the silver particles are fed into the blanking bin 301 through the feed port of the blanking bin 301. After entering the blanking bin 301, the silver particles slide down along the eight sets of blanking plates 305 in sequence and fall into the feeding pipe 201;

[0053] In step S2, the blower 408 blows air into the four groups of primary curved air bins 406 through the primary air duct 403a. The air flows through the air supply ports of the four groups of primary curved air bins 406 and blows toward the four corresponding blanking plates 305. After being guided by the four groups of blanking plates 305, the air flows toward the outlet of the dust discharge hopper 302 obliquely above. The silver particles slide against the wind on these four groups of blanking plates 305. The air flow removes dust from the surface of the silver particles. When the silver particles fall, they collide with the blanking plates 305, which also shakes out dust, which is then carried away by the air flow.

[0054] 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 are transported by the feeding screw 203 into the crushing bin 101. The air flow is input into the air bag 104 through the air blowing device and the air inlet 105. The air flow passes through the four groups of manifolds 106 and 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 air flow. The silver powder moves upward under the action of the air flow. 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;

[0055] S4, after a period of continuous operation, the servo drive motor 404 drives the core column 403 to rotate 180 degrees, so that the blower 408, the secondary air duct 403b and the four groups of secondary arc-shaped air bins 407 are connected. When the core column 403 rotates, the two groups of synchronous wheels 405 and the synchronous belt drive the rotating cage 304 to rotate synchronously. The rotating cage 304 rotates 180 degrees, and each group of blanking plates 305 also rotates 180 degrees. When the rotating 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 air flow passes through the air supply port of the four groups of secondary arc-shaped air bins 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 hopper 302 obliquely above. The silver particles slide against the wind on these four groups of blanking plates 305, and the air flow carries away the dust on the surface of the silver particles.

[0056] 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 perform silver powder processing.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. 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) includes 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 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), the diverter pipe (106) and the Laval nozzle (107) are each provided with four groups, the four groups of diverter pipes (106) are equidistantly arranged around the air bag (104) and one end of each of the four groups of Laval nozzles is fixedly connected to the air bag (104), and the four groups of Laval nozzles (107) are fixedly connected to the air bag (104). The Laval nozzles (107) are 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). 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 fixedly communicated with the side wall of the 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 blanking mechanism (300) comprises a blanking bin (301), an ash discharge hopper (302), a secondary support (303), a rotating cage (304), a blanking plate (305) and a brush plate (306). The blanking 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 blanking bin (301) and its air outlet is located near the top of the blanking bin (301). Four groups of secondary supports (303) are fixedly connected to the bottom of the blanking bin (301). The rotating cage (304) is rotatably arranged in the blanking bin (301) and has a bucket-shaped bottom. The bottom of the rotating cage (304) passes through the blanking bin (301) and is rotatably connected to the blanking bin (301). The bottom end of the rotating cage (304) 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 equidistant and inclined along the vertical direction on the inner side of the rotating cage (304). The eight groups of blanking plates (305) are all fixedly connected to the rotating cage (304), wherein 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 alternately arranged. 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 the side close to the rotating cage (304); An air supply and dust removal mechanism (400) comprises a housing (401), three-stage columns (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), wherein the housing (401) is arranged on a side of the drop bin (301) facing away from the ash discharge hopper (302) and is located above the feed pipe (201), four groups of three-stage columns (402) are fixedly connected to the bottom of the housing (401), the core column (403) is rotatably arranged in the housing (401) and matches the size of the housing (401), the top and bottom of the core column (403) both have a rotating shaft, and the rotating shafts at the top and bottom of the core column (403) are fixed to the bottom of the housing (401). 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 servo drive motor (404) shaft is fixedly connected to the core column (403) shaft, and the synchronous wheels (405) are provided in two groups, one of which is provided below the shell (401) and is fixedly connected to the core column (403) shaft, and the other 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 a synchronous belt transmission. The first-level arc-shaped air bin (406) and the second-level arc-shaped air bin (407) are both provided in four groups 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 the 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 side close to the shell (401) with air supply pipes. The eight groups of air supply pipes all pass through the blanking bin (301) and are fixedly connected to the blanking bin (301). The ends of the eight groups of air supply pipes away from the blanking bin (301) are connected to the shell (40 1) Fixedly connected, a primary air duct (403a) and a secondary air duct (403b) are provided on the outside 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 simultaneously connected to four groups of primary arc-shaped air bins (406), the secondary air duct (403b) can be simultaneously connected to four groups of secondary arc-shaped air bins (407), 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 blanking plates (305) that are tilted downwardly in a direction away from the ash 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. The air flow 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), wherein the fixed plate (204) is fixedly connected to four groups of secondary pillars (303) and is arranged below the feeding pipe (201), and 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, and the two groups of fixing plates (204) are symmetrically arranged on 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 includes a limiting block (307), a limiting groove (304a) is provided on the top of the side wall of the rotating cage (304) in the horizontal direction, and the arc of the limiting groove (304a) is 180 degrees. The limiting block (307) is fixedly connected to the inner wall of the blanking bin (301) and inserted into the limiting groove (304a). When the blower (408), the first-level air duct (403a) and the four groups of first-level arc-shaped air bins (406) are connected, the limiting block (307) is located at one end of the limiting groove (304a), and when the blower (408), the second-level air duct (403b) and the four groups of second-level arc-shaped air bins (407) are connected, the limiting block (307) is located at the other end of the limiting 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 upward.

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 feeding pipe (201), the feeding bin (301), the ash discharge hopper (302) and the shell (401) are all made of stainless steel, and the surfaces of the feeding pipe (201), the feeding 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 silver powder production 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 first-level air duct (403a) and the four groups of first-level arc-shaped air bins (406) are connected, and the silver particles are fed into the blanking bin (301) through the feeding port of the blanking bin (301). After entering the blanking bin (301), the silver particles slide down along the eight groups of blanking plates (305) in sequence and fall into the feeding pipe (201); S2, the blower (408) blows air into the four groups of first-level arc-shaped air bins (406) through the first-level air duct (403a), and the air flow is blown to the four groups of corresponding blanking plates (305) through the air supply ports of the four groups of first-level arc-shaped air bins (406). After being guided by the four groups of blanking plates (305), the air flow flows to the outlet of the dust discharge hopper (302) at the upper side. 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), which also shakes out the dust, and the dust is carried 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 transportation of the feeding screw (203). The air flow is input into the air bag (104) through the air blowing device and the air inlet (105). The air flow passes through the four groups of manifolds (106) and 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 air flow. The silver powder moves upward under the action of the air flow. 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 degrees, so that the blower (408), the secondary air duct (403b) and the four sets of secondary arc-shaped air chambers (407) are connected. When the core column (403) rotates, the rotating cage (304) is driven by the two sets of synchronous wheels (405) and the synchronous belt to rotate synchronously. The rotating cage (304) rotates 180 degrees, and each set of blanking plates (305) also rotates 180 degrees. The rotating cage (304) rotates When the filter is in motion, the bristles of the brush plate (306) clean the filter screen and brush off the silver particles with irregular shapes or burrs hanging on the filter screen. The blower (408) continuously supplies air. At this time, the air flow passes through the air supply ports of the four sets of secondary arc-shaped air bins (407) and blows toward the four sets of corresponding blanking plates (305). After being guided by the four sets of blanking plates (305), it flows toward the outlet of the dust discharge hopper (302) at an angle upward. The silver particles slide against the wind on the four sets of blanking plates (305), and the air flow 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 this reciprocating process continues to perform silver powder processing.

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