Silver powder non-extrusion grinding equipment and high-activity silver powder crushing method
By designing a non-extrusion grinding equipment for silver powder, using scrapers and elastic components to simulate the grinding of a human hand, the low efficiency and safety issues of manual grinding are solved, achieving efficient and safe silver powder production.
Patent Information
- Application Number
- CN202511599801.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-04
- Publication Date
- 2026-01-09
AI Technical Summary
In existing technologies, the grinding of highly active silver powder relies on manual labor, which results in high labor intensity for operators, low production efficiency, serious dust hazards, and inconsistent product parameters.
A non-extrusion grinding device for silver powder was designed. It adopts a grinding method that simulates the palm of a human hand. The drive component moves the scraper on the lower screen. Combined with elastic components and shock absorbers, it realizes automated grinding, avoids excessive pressure, and ensures that the microstructure of silver powder is not damaged.
Automated grinding was achieved, which reduced the labor intensity of operators, reduced dust hazards, improved production efficiency, and ensured the consistency and activity of silver powder products.
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Figure CN121289486A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of high-activity silver powder production, and particularly relates to a silver powder non-extrusion grinding device and a high-activity silver powder crushing method. BACKGROUND
[0002] Silver acetate reduction is a main method for preparing high-activity silver powder. The silver powder precursor prepared by the method is a block sintered silver in macroscopic view, and is a spherical silver with a large number of micropores and mesopores in microscopic structure, and needs to be crushed into silver powder through crushing and other operations.
[0003] The traditional crushing process and equipment on the market are completed under a high-intensity impact. Under this condition, the material will be subjected to a large pressure, and since silver has a strong ductility, the microscopic structure of the fire-reduction silver powder will be changed, and the micropore and mesopore structures will be destroyed, resulting in a decline in the chemical activity and electrical performance of the silver powder.
[0004] Therefore, the crushing can only be performed in a non-extrusion grinding mode. At present, the non-extrusion grinding can only be completed manually. The operator wears canvas gloves, takes the reduced silver powder block, breaks it, puts it into a screen, and rubs the broken silver powder block back and forth with both hands to make the silver powder fall into a powder box through a 60-mesh screen. At present, the crushed silver powder meets the production requirements in terms of the apparent density after screening.
[0005] However, the manual grinding has the following defects: the labor intensity of the operator is large, and the production efficiency is generally low. The operation process produces dust, which is close to the operator and causes occupational hazards to the human body, and the silver powder consumption is large. In addition, since the manual crushing is different in operation mode for different operators, the product parameters will be different. Therefore, a non-extrusion grinding device is needed to complete this process. SUMMARY
[0006] The present application aims to overcome the above technical deficiencies, and provides a silver powder non-extrusion grinding device and a high-activity silver powder crushing method, to solve the technical problem in the prior art that the grinding of high-activity silver powder relies on manual operation.
[0007] To achieve the above technical purposes, the present application adopts the following technical solutions: In a first aspect, the present application provides a silver powder non-extrusion grinding device, comprising: a grinding chamber and a grinding device, The grinding chamber comprises an outer shell and a lower screen, the outer shell has a feeding port and a discharging port, and the lower screen is arranged in the outer shell to divide a grinding cavity above and a discharging cavity below, the feeding port is communicated with the top of the grinding cavity, and the discharging port is communicated with the bottom of the discharging cavity; The grinding device comprises a driving member, elastic members and a scraper, the driving member is connected with the scraper through the elastic members, the scraper is arranged in the grinding cavity and abuts against the upper surface of the lower screen, and the driving member can drive the scraper to move on the upper surface of the lower screen to grind silver powder.
[0008] In some embodiments, the grinding chamber further comprises an upper screen, the upper screen is arranged at the feeding port, and the mesh number of the upper screen is smaller than that of the lower screen.
[0009] In some embodiments, the grinding chamber further comprises a sealing cover, the sealing cover is detachably connected with the feeding port and the discharging port to seal the feeding port and the discharging port.
[0010] In some embodiments, the material of the lower screen and the shell is 304 stainless steel.
[0011] In some embodiments, the grinding chamber further comprises a collecting block, the collecting block is fixedly arranged on the lower screen and located outside the movement path of the scraper.
[0012] In some embodiments, the driving member is a motor, the driving shaft of the driving member is coaxially arranged with the grinding cavity, the grinding device further comprises a connecting frame, the driving shaft of the driving member is connected with the connecting frame, and the plurality of elastic members are uniformly distributed around the driving shaft and respectively connected with the connecting frame.
[0013] In some embodiments, the grinding device further comprises a shock absorber, the elastic members are connected with the scraper through the shock absorber, and the shock absorber is used to absorb the vibration of the elastic members.
[0014] In some embodiments, the grinding device further comprises a connecting member, the connecting member is fixedly connected with the shock absorber, the connecting member has a female gear ring, the scraper has a male gear corresponding to the female gear ring, and the included angle between the scraper and the lower screen can be adjusted through the male gear and the female gear ring.
[0015] In a second aspect, the present application further provides a high-activity silver powder crushing method, comprising the following steps: cutting the sintered silver into silver blocks of appropriate size; drying the silver blocks in a vacuum drying box; grinding the dried silver blocks by using the silver powder non-extrusion grinding equipment to obtain silver powder; screening the silver powder to obtain qualified silver powder, and sending the silver powder that does not pass the screening back to the silver powder non-extrusion grinding equipment for regrinding.
[0016] In some embodiments, the method for drying the silver blocks is drying at 0.08 MPa and 80°C for 24 hours.
[0017] Compared with the prior art, the silver powder non-extrusion grinding device provided by the application adopts a design simulating a palm, which can replace the operation personnel's arm and palm to sieve the silver powder, meet the required silver powder bulk density in production, avoid the difference caused by different operation personnel, and ensure the product consistency. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 is a structural schematic view of the silver powder non-extrusion grinding device provided by the embodiment of the application; Figure 2 is a top view of the silver powder non-extrusion grinding device provided by the embodiment of the application; Figure 3 is a flow chart of the high-activity silver powder crushing method provided by the embodiment of the application. DETAILED DESCRIPTION
[0019] In order to make the purpose, technical scheme and advantages of the application more clear, the application is further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and do not limit the application.
[0020] In order to solve the technical problem that the grinding of high-activity silver powder in the prior art depends on manual operation, the application provides a silver powder non-extrusion grinding device and a high-activity silver powder crushing method, which can replace the operation personnel's arm and palm to sieve the silver powder.
[0021] Please refer to Figure 1 and Figure 2 , Figure 1 is a structural schematic view of the silver powder non-extrusion grinding device provided by the embodiment of the application; Figure 2 is a top view of the silver powder non-extrusion grinding device provided by the embodiment of the application.
[0022] The silver powder non-extrusion grinding device comprises a grinding chamber 1 and a grinding device 2.
[0023] The grinding chamber 1 comprises an outer shell 11 and a lower screen 12, the outer shell 11 has a feeding port 111 and a discharging port 112, and the lower screen 12 is arranged in the outer shell 11 to divide a grinding cavity located above and a discharging cavity located below, the feeding port 111 is communicated with the top of the grinding cavity, and the discharging port 112 is communicated with the bottom of the discharging cavity.
[0024] The grinding device 2 comprises a driving member 21, an elastic member 22 and a scraper 23, the driving member 21 is connected with the scraper 23 through the elastic member 22, and the scraper 23 is arranged in the grinding cavity and abuts against the upper surface of the lower screen 12. The driving member 21 can drive the scraper 23 to move on the upper surface of the lower screen 12 to grind the silver powder.
[0025] In the grinding, only need to put the silver block into the grinding cavity through the feeding port 111, the scraper 23 drives the scraper 23 to move on the lower sieve 12 to scrape the silver block into silver powder on the lower sieve 12. The elastic member 22 can avoid excessive pressure extrusion of the silver block, and better simulate the hand grinding of silver powder. The ground silver powder passes through the lower sieve 12 into the discharge cavity, and is discharged through the discharge port 112.
[0026] In some embodiments, the shell 11 is preferably designed in a split type to facilitate the replacement, cleaning and maintenance of various equipment structures in the shell 11. In the present embodiment, the grinding cavity is a cylindrical structure, and the discharge cavity is a conical structure, which are preferably detachably connected to form an upper and lower split structure.
[0027] On the basis of the above-mentioned embodiments, the material of the shell 11 is preferably 304 stainless steel, which is a general-purpose stainless steel, non-toxic, has good corrosion resistance, heat resistance, low temperature strength and mechanical properties, and does not affect the properties of the silver powder. One or more observation windows can also be provided on the shell 11, covered with transparent acrylic plates and sealed with silicone. In order to observe the grinding condition.
[0028] In some embodiments, the material of the lower sieve 12 is also 304 stainless steel, for the same reason as the selection of 304 stainless steel for the shell 11, which will not be repeated here.
[0029] In some embodiments, the grinding chamber 1 further comprises an upper sieve 13, which is arranged at the feeding port 111. The mesh number of the upper sieve 13 is smaller than that of the lower sieve 12, which plays a role in preliminary large particle screening. In the present embodiment, the upper sieve 13 is 2 mesh, and the lower sieve 12 is 60 mesh.
[0030] In some embodiments, the grinding chamber 1 further comprises a sealing cover, which is detachably connected with the feeding port 111 and the discharge port 112, to seal the feeding port 111 and the discharge port 112 during grinding. On the one hand, it avoids impurities entering the silver powder, and on the other hand, it avoids the silver powder from floating out of the grinding chamber 1.
[0031] In some embodiments, the grinding chamber 1 further comprises a collection bump 14, which is fixedly arranged on the lower sieve 12 and located outside the movement path of the scraper 23. The collection bump 14 is used to guide the silver block from the feeding port 111 to the movement path of the scraper 23 for grinding. In the present embodiment, the collection bump 14 is semispherical or semi-ellipsoidal.
[0032] In some embodiments, the driving member 21 is an electric motor, the driving shaft of the driving member 21 is arranged coaxially with the grinding cavity, the grinding device 2 further comprises a connecting frame 24, the driving shaft of the driving member 21 is connected with the connecting frame 24, and a plurality of elastic members 22 are uniformly distributed around the driving shaft and connected with the connecting frame 24 respectively. The driving member 21 drives the plurality of scrapers 23 to rotate in the grinding cavity to grind the silver powder.
[0033] In the present embodiment, the driving member 21 adopts a motor of model YE2-100L2-4, the driving shaft of which has a maximum rotating speed of 1390r / min and a length of 167mm. The motor meets the working requirements of the crushing device, and the short driving shaft makes the grinding device 2 more rigid, has a longer service life, and is more stable in overall uniform rotation, thus reducing noise and vibration and ensuring that the scraper 23 simulates the palm to contact the silver powder more uniformly.
[0034] In some embodiments, the elastic member 22 includes a spring, and the scraper 23 is connected by the spring.
[0035] In some embodiments, the scraper 23 is made of a non-metal material. The reason is that any two different metals have different abilities of atomic nucleus to bind the outermost electrons. When friction occurs, the metal with weak ability of atomic nucleus to bind the outermost electrons is easy to lose electrons, and the metal losing electrons will be positively charged; and the other metal with strong ability of atomic nucleus to bind the outermost electrons will gain electrons and be positively charged. If a metal is selected as the material of the scraper, the above situation will occur, and the electrical properties of the silver powder will change. If a pure silver scraper is selected, the cost is higher.
[0036] Therefore, only a non-metal material can be selected to make the scraper. In order to be consistent with the silver powder rubbed by hand as much as possible in the crushing device, a non-metal material close to the human palm needs to be selected. As shown in the following table, seven common non-metal materials are selected as the alternative materials of the scraper. The density and Shore hardness of the materials are measured. The Shore hardness of the palms of different operators and the Shore hardness of each part of the palm are also measured.
[0037] Properties of non-metal materials
[0038] It is found through measurement that the 704 silicone rubber and black high-density EVA foam have a hardness close to that of the human palm, and the density of the 704 silicone rubber is closest to that of the human palm. Therefore, we make the scraper from the seven materials respectively. It is found through experiments that the six non-metal materials except the wood board can meet the production requirements, and the silver powder has a bulk density of 0.5-1.0g / cm³.
[0039] In some embodiments, the grinding device 2 further includes a shock absorber 25, and the elastic member 22 is connected with the scraper 23 through the shock absorber 25. The shock absorber 25 is a device used to suppress the vibration of the spring when it rebounds after absorbing the shock.
[0040] The elastic member 22 and the shock absorber 25 simulate the human arm and generate a downward pressure on the silver powder during the grinding process. In the process of grinding the silver powder, due to uneven feeding, the thickness of the silver powder on the lower screen 12 is inconsistent, resulting in inconsistent force on the silver powder during operation of the equipment. In order to ensure the stable operation of the grinding device 2 and the uniform force on the silver powder, the elastic member 22 is provided. Although the elastic member 22 can absorb the vibration, the spring itself will also have a reciprocating motion, which will cause great harm to the lower screen 12 and the equipment, so the shock absorber 25 is matched to suppress the jumping of the spring.
[0041] In order to explore the model of the elastic member 22 and the shock absorber 25, three artificial crushing tools were prepared, the artificial crushing tools were placed on the electronic scale, and three operators A, B and C were respectively asked to perform 5kg silver powder crushing work, and the increase of the electronic scale during crushing was recorded. At the same time, a displacement sensor was worn at the bottom of the palm to record the vertical displacement X of the palm, and the test data are as follows.
[0042] Electronic scale data change
[0043] The pressure F of the human arm on the silver powder is Gg (g is 10m / s 2 ), and the pressure of the human arm on the silver powder is 100-190N. It is regarded as a spring, and the elastic coefficient is K=△F / X=90N / 0.01m=9000. Therefore, the elastic member 22 with an elastic coefficient of 9000 and the matching shock absorber 25 are preferred.
[0044] As a feasible embodiment, considering the difficulty of obtaining related equipment, a spring with an elastic coefficient of 10000 and a matching shock absorber 25 are selected. The spring diameter is 5mm, and the spring length is 70mm. The shock absorber hole distance is 125mm, and the support rod diameter is 10mm.
[0045] In some embodiments, the grinding device 2 further comprises a connecting member 26, the connecting member 26 is fixedly connected with the shock absorber 25, the connecting member 26 has a female ring gear, the scraper 23 has a male gear corresponding to the female ring gear, and the female ring gear and the male gear are connected in a matched manner. The angle between the scraper 23 and the lower screen 12 can be adjusted by rotating the male gear.
[0046] It is easy to understand that the silver powder non-extrusion grinding equipment also comprises a fixed structure such as a rack to carry the grinding chamber 1 and the grinding device 2.
[0047] The silver powder non-extrusion grinding equipment has the following advantages: (1) The device meets the production needs, the sieved silver powder meets the requirements, the structure is stable, the operation is smooth, the transmission is direct and efficient, the operation is convenient, the cost is low, the maintenance is convenient, and the production efficiency is greatly improved, which can replace multiple people to crush at the same time.
[0048] (2) The device has good sealing performance, less dust during operation, reduces the occupational hazards to the operators, and effectively reduces the loss of silver powder.
[0049] (3) The device effectively avoids the differences caused by different operators, and ensures the consistency of the products.
[0050] Please refer to Figure 3 , Figure 3 is a flow chart of the high-activity silver powder crushing method provided by the embodiment of the present application.
[0051] The high-activity silver powder crushing method comprises the following steps: cutting the sintered silver into silver blocks of appropriate size; putting the silver blocks into a vacuum drying box for drying; grinding the dried silver blocks by using the above-mentioned silver powder non-extrusion grinding equipment to obtain silver powder; screening the silver powder to obtain qualified silver powder, and sending the silver powder that does not pass the screening back to the above-mentioned silver powder non-extrusion grinding equipment for re-grinding.
[0052] In some embodiments, the silver blocks are usually cut into small blocks of about 3 cm in size when cutting. And it is preferred to use ceramic knives for cutting, which has a larger ceramic hardness, can reduce the damage of the blade and bring impurities into the silver blocks.
[0053] In some embodiments, the method for drying the silver blocks is to dry for 24 hours under the condition of 0.08 MPa and 80℃. The water in the silver blocks can be removed, and at the same time, the silver material can maintain a high hardness due to the low temperature, which is helpful for subsequent grinding.
[0054] Since the silver powder non-extrusion grinding equipment is used for grinding, the microstructure of the silver powder can be protected, the loose bulk density of the silver powder (0.5-0.1 g / cm 3 ) can be reduced, and the activity of the silver powder can be retained as much as possible.
[0055] The specific embodiments of the present application described above do not constitute a limitation on the protection scope of the present application. Any various other corresponding changes and modifications made according to the technical concept of the present application shall be included in the protection scope of the claims of the present application.
Claims
1. A non-extrusion grinding device for silver powder, characterized in that, include: A grinding chamber includes a housing and a lower screen. The housing has a feed inlet and a discharge outlet. The lower screen is disposed inside the housing to separate an upper grinding chamber and a lower discharge chamber. The feed inlet communicates with the top of the grinding chamber, and the discharge outlet communicates with the bottom of the discharge chamber. A grinding device includes a driving component, an elastic component, and a scraper. The driving component is connected to the scraper via the elastic component. The scraper is disposed in the grinding chamber and abuts against the upper surface of the lower screen. The driving component can drive the scraper to move on the upper surface of the lower screen to grind silver powder.
2. The silver powder non-extrusion grinding equipment according to claim 1, characterized in that, The grinding chamber also includes an upper screen, which is located at the feed inlet and has a smaller mesh size than the lower screen.
3. The silver powder non-extrusion grinding equipment according to claim 1, characterized in that, The grinding chamber also includes a sealing cover, which is detachably connected to the inlet and outlet to seal the inlet and outlet.
4. The silver powder non-extrusion grinding equipment according to claim 1, characterized in that, The lower screen and the outer shell are made of 304 stainless steel.
5. The silver powder non-extrusion grinding equipment according to claim 1, characterized in that, The grinding chamber also includes a collection block, which is fixedly installed on the lower screen and located outside the movement path of the scraper.
6. The silver powder non-extrusion grinding equipment according to claim 1, characterized in that, The driving component is a motor, and the driving shaft of the driving component is arranged coaxially with the grinding chamber. The grinding device also includes a connecting frame, and the driving shaft of the driving component is connected to the connecting frame. A plurality of elastic elements are evenly distributed around the driving shaft and are respectively connected to the connecting frame.
7. The silver powder non-extrusion grinding equipment according to claim 1, characterized in that, The grinding device also includes a shock absorber, and the elastic element is connected to the scraper through the shock absorber. The shock absorber is used to absorb the vibration of the elastic element.
8. The silver powder non-extrusion grinding equipment according to claim 7, characterized in that, The grinding device also includes a connector, which is fixedly connected to the shock absorber. The connector has a female gear ring, and the scraper has a male gear corresponding to the female gear ring. The angle between the scraper and the lower screen can be adjusted by the male gear and the female gear ring.
9. A method for pulverizing highly active silver powder, characterized in that, Includes the following steps: Cut the sintered silver into silver blocks of appropriate size; The silver ingot was placed in a vacuum drying oven to dry; Silver powder is obtained by grinding a dried silver block using the non-extrusion grinding equipment described in any one of claims 1-8. The silver powder is sieved to obtain qualified silver powder, and the silver powder that does not pass the sieve is sent back to the non-extrusion grinding equipment for further grinding.
10. The method for pulverizing highly active silver powder according to claim 9, characterized in that, The method for drying the silver ingot is to dry it for 24 hours at 0.08 MPa and 80°C.