CN114633046B - High-stability environment-friendly soldering paste and preparation method thereof - Google Patents
High-stability environment-friendly soldering paste and preparation method thereof Download PDFInfo
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- CN114633046B CN114633046B CN202210245999.0A CN202210245999A CN114633046B CN 114633046 B CN114633046 B CN 114633046B CN 202210245999 A CN202210245999 A CN 202210245999A CN 114633046 B CN114633046 B CN 114633046B
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- 238000005476 soldering Methods 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000000843 powder Substances 0.000 claims abstract description 122
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 66
- 239000000956 alloy Substances 0.000 claims abstract description 66
- 229910000679 solder Inorganic materials 0.000 claims abstract description 48
- 238000012216 screening Methods 0.000 claims abstract description 40
- 230000004907 flux Effects 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000002245 particle Substances 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 17
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000007599 discharging Methods 0.000 claims abstract description 8
- 238000000227 grinding Methods 0.000 claims description 142
- 239000000463 material Substances 0.000 claims description 116
- 238000003756 stirring Methods 0.000 claims description 43
- 229910001297 Zn alloy Inorganic materials 0.000 claims description 38
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 claims description 18
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 18
- 239000003795 chemical substances by application Substances 0.000 claims description 18
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 16
- 238000012546 transfer Methods 0.000 claims description 15
- 238000007873 sieving Methods 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 10
- 239000013008 thixotropic agent Substances 0.000 claims description 10
- 230000003213 activating effect Effects 0.000 claims description 9
- 239000003963 antioxidant agent Substances 0.000 claims description 9
- 230000003078 antioxidant effect Effects 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000008139 complexing agent Substances 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000002904 solvent Substances 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 8
- 238000011049 filling Methods 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 5
- 230000003116 impacting effect Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 125000006850 spacer group Chemical group 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 2
- 239000006185 dispersion Substances 0.000 claims 2
- 230000007613 environmental effect Effects 0.000 claims 1
- 238000003801 milling Methods 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 description 13
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 12
- 235000017491 Bambusa tulda Nutrition 0.000 description 12
- 241001330002 Bambuseae Species 0.000 description 12
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 12
- 239000011425 bamboo Substances 0.000 description 12
- 206010044565 Tremor Diseases 0.000 description 10
- 238000010009 beating Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004100 electronic packaging Methods 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- FGRBYDKOBBBPOI-UHFFFAOYSA-N 10,10-dioxo-2-[4-(N-phenylanilino)phenyl]thioxanthen-9-one Chemical compound O=C1c2ccccc2S(=O)(=O)c2ccc(cc12)-c1ccc(cc1)N(c1ccccc1)c1ccccc1 FGRBYDKOBBBPOI-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/362—Selection of compositions of fluxes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
Abstract
A high-stability environment-friendly soldering paste and a preparation method thereof belong to the technical field of soldering paste and preparation, and aim to solve the problem that the soldering stability of electronic elements is affected by the soldering paste prepared by mixing the solder powder with overlarge particle size and soldering flux because the particle size of the solder powder is not fully ensured when the solder powder is put in the processing preparation of the existing soldering paste; according to the invention, the first millstone and the second millstone with different diameters are coaxially arranged in the milling and screening cylinder, the first millstone and the second millstone perform differential rotation to mill and screen the alloy powder which is thrown downwards, the second millstone rotates to jack up the bottom of the discharger to perform intermittent shaking and discharging, and the millstone is carefully thrown out to separate and mill and screen, so that the millstone milling and screening and the linkage control of millstone rotation and discharging are realized; the method is beneficial to ensuring the particle size of the tin powder during the preparation of the tin paste, avoiding the trouble of additionally detecting the particle size data of the tin powder during the blanking and mixing of the tin powder, and is convenient and practical.
Description
Technical Field
The invention relates to the technical field of solder paste and preparation, in particular to high-stability environment-friendly solder paste and a preparation method thereof.
Background
The electronic packaging technology represented by the integrated circuit is the core of the electronic information industry, and is a key technology for informatization driving industrialization and accelerating the optimization and upgrading of the traditional industrial structure and a foundation stone for the development of information society. The current electronic packaging technology mainly develops to the directions of high power, high density, miniaturization, high reliability, greenization and the like, and most electronic components realize automatic packaging in the processes of reflow soldering, wave soldering and the like, wherein the reflow soldering mainly realizes packaging in the processes of screen printing soldering paste, component patch, reflow soldering and the like.
Solder paste is also called solder paste, gray paste. Solder paste is a novel solder material which is generated along with SMT, and is a paste mixture formed by mixing soldering powder, soldering flux, other surfactants, thixotropic agents and the like. The solder is mainly used for soldering electronic components such as PCB surface resistance, capacitance, IC and the like in SMT industry. An important function of the solder paste joints is to ensure the final quality of all soldered assembled substrates, which should ensure reliable mechanical interconnection in addition to providing a strong electrical connection. However, when the conventional solder paste is processed to prepare tin powder, the particle size of the tin powder is not fully ensured, and the solder paste prepared by mixing the tin powder with the soldering flux with the overlarge particle size influences the welding stability of electronic elements and influences the quality of the solder paste.
Therefore, we propose a high-stability environment-friendly solder paste and a preparation method thereof.
Disclosure of Invention
The invention aims to provide high-stability environment-friendly soldering paste and a preparation method thereof, and aims to solve the problem that in the prior art, when tin powder is added in the process of processing and preparing the existing soldering paste, the particle size of the tin powder cannot be fully ensured, and the soldering stability of an electronic element is affected by the tin paste prepared by mixing the tin powder with the oversized particle size with soldering flux.
In order to achieve the above purpose, the present invention provides the following technical solutions: the high-stability environment-friendly soldering paste is formed by mixing Sn-Ag-Zn alloy powder serving as solder and soldering flux, wherein the weight percentage of the Sn-Ag-Zn alloy powder is 85% -90%, and the weight percentage of the soldering flux is as follows: 30% -40% of rosin; 2% -5% of a connecting agent; 3% -5% of an activating agent; 6% -10% of thixotropic agent; 0.5% -0.7% of antioxidant; 35% -45% of solvent; 0.3% -0.5% of complexing agent.
The invention provides another technical scheme: a preparation method of high-stability environment-friendly soldering paste comprises the following steps:
s1: preparing raw materials for preparing the solder paste according to a proportioning table, quantitatively weighing Sn-Ag-Zn alloy powder, rosin, a connecting agent, an activating agent, a thixotropic agent, an antioxidant, a solvent and a complexing agent, and reserving after weighing;
s2: after the raw materials are extracted, putting rosin, a solvent and a complexing agent into a reaction container, dissolving and uniformly stirring the rosin in an environment of 120-140 ℃, cooling the rosin to 40-70 ℃ after the rosin is dissolved, continuously adding a connecting agent, an activating agent, a thixotropic agent and an antioxidant to uniformly stir, cooling to room temperature after the solution components are completely clarified, and standing for 24 hours to prepare the soldering flux;
s3: taking out the weighed Sn-Ag-Zn alloy powder, placing the Sn-Ag-Zn alloy powder into a solder paste production device, grinding and screening the alloy powder, ensuring that the particle size of the alloy powder meets the compound preparation requirement, and putting the prepared soldering flux into a reaction cylinder at the lower part of the production device;
s4: screening Sn-Ag-Zn alloy powder, uniformly throwing the powder into a reaction cylinder, stirring and mixing the powder and soldering flux while throwing the powder, and uniformly cooling the mixture to room temperature to obtain tin paste;
s5: and (3) filling after the solder paste is prepared, sealing and preserving the solder paste after filling, and storing the solder paste in a low-temperature environment after sealing and packaging.
Further, solder paste apparatus for producing includes the backup pad and sets up in the churn at backup pad top, the backup pad top of churn adjacent department is provided with the elevating seat, be provided with on the lateral wall that the elevating seat is close to top department and grind the screening section of thick bamboo, be provided with the feeder hopper near top department on the outer wall of screening section of thick bamboo one side, the feeder hopper bottom extends to in the screening section of thick bamboo that grinds, its end-to-end connection has the glassware down, it is provided with first mill to grind screening section of thick bamboo bottom plate upper end, the mounting groove has been seted up at first mill top, mounting groove bottom plate upper end middle part department fixedly connected with first gear, first gear swing joint driving medium, the driving medium top links to each other with the first belt pulley activity of second mill bottom, second mill swing joint is installed in the mounting groove, second mill diameter is less than first mill diameter, and second mill top fixedly connected with pivot, the inside first mill of mounting groove below is provided with the chamber that gathers materials, set up the feed inlet on the outer wall of chamber both sides, the feed inlet is pressed close to the end of the guide bevel ring on the screening section of thick bamboo inner wall that grinds, the chamber bottom is provided with communicating pipe, the communicating pipe runs through and extends to the unloading pipe of screening section of thick bamboo bottom.
Further, the driving medium is including placing the second gear in first gear one side mounting groove bottom plate upper end, the second gear meshes with first gear mutually, and second gear top fixedly connected with connecting axle, the activity has cup jointed the spacer sleeve on the outer wall of connecting axle, fixedly connected with L type connecting rod on the outer wall of one side of spacer sleeve, extend to communicating pipe port outside after the terminal first gear and the first mill of running through of L type connecting rod, and through dead lever and unloading pipe inner wall fixed connection, the top fixedly connected with second belt pulley of connecting axle, the second belt pulley cup joints mutually with the first belt pulley of second mill bottom through driving belt, second belt pulley diameter is less than first belt pulley diameter.
Further, the steps of milling and sieving the Sn-Ag-Zn alloy powder are as follows:
s301: sn-Ag-Zn alloy powder is put into a feed hopper, the Sn-Ag-Zn alloy powder slides into a blanking device for uniform blanking, then a rotating shaft is started to drive a second grinding disc to rotate, the second grinding disc drives a second belt pulley to rotate through a first belt pulley and a transmission belt, and the second belt pulley uses a second gear below the second belt pulley to engage with a first gear to drive the first grinding disc to rotate in a differential speed;
s302: the alloy powder falls into a fine gap between the second grinding disc and the inner wall of the grinding and sieving cylinder due to centrifugal force after falling on the top of the second grinding disc, the second grinding disc finely grinds the large-particle-size powder when rotating, the alloy powder with smaller particle size falls into the fine gap between the first grinding disc and the inner wall of the grinding and sieving cylinder, and the first grinding disc rotates and grinds the alloy powder more quickly;
s303: the alloy powder is subjected to rotary milling through a first millstone and then is compounded and compounded to meet the use requirement, and then the alloy powder with qualified particle size falls into a material guiding inclined ring on the inner wall of a milling and screening cylinder and slides down into a feed inlet on the side wall of the first millstone along the inner wall of the material guiding inclined ring;
s304: alloy powder enters the aggregate cavity in the first grinding disc through the feed inlet, then slides down into the communicating pipe along the inclined inner wall of the aggregate cavity, and is guided into the blanking pipe at the bottom of the grinding and screening cylinder through the communicating pipe to be blanked.
Further, the glassware down includes that the activity cup joints the installation cover on the pivot outer wall and the transfer section of thick bamboo of fixed connection on installation cover one side outer wall, transfer section of thick bamboo top is provided with the material receiving pipe, material receiving pipe top and the terminal fixed continuous of feeder hopper bottom, and transfer section of thick bamboo bottom is provided with through flexible connection portion and trembles material oblique cone, trembles material oblique cone terminal orientation second mill border setting, transfer section of thick bamboo is kept away from and trembles and is provided with fixed section of thick bamboo on the outer wall of material oblique cone port one side, fixed barrel bottom port internal activity cup joints L type jib, the terminal fixedly connected with of L type jib trembles the ball, second mill bottom top corresponds and trembles ball department and is annular evenly to be provided with hemispherical groove, fixedly connected with trembles the material on the L type jib montant lateral wall and dials the board, trembles the material and dials the board terminal press close to suspension in trembles the bottom of material oblique cone, and trembles and be provided with buffer spring on the L type jib outer wall between material dials board and the fixed barrel port, buffer spring keeps normal diastole, tremble the ball lock in hemispherical groove.
Further, the blanking step of the blanking device is as follows:
s3011: sn-Ag-Zn alloy powder enters the transfer cylinder through the feed hopper and the material receiving pipe, a hemispherical groove at the top of the second millstone intermittently buckles shaking balls at the tail end of the L-shaped suspender when the second millstone rotates, and the shaking balls drive the buffer spring to vibrate through the hemispherical groove to enable the shaking stirring plate to move up and down along with the L-shaped suspender;
s3012: when the shaking stirring plate moves upwards, the tail end of the shaking stirring plate upwards dials and lifts the shaking inclined cone cylinder, so that the port at the bottom of the shaking inclined cone cylinder is separated from the top surface of the second grinding disc, and alloy powder in the middle rotating cylinder slides to the top of the rotating second grinding disc through the shaking inclined cone cylinder when the second grinding disc rotates;
s3013: and when the shaking plate is arranged below the shaking plate, the tail end of the shaking plate stops stirring and lifting the shaking inclined cone cylinder, the port at the bottom of the shaking inclined cone cylinder is attached to the top surface of the second grinding disc to stop discharging, the shaking ball is buckled intermittently along with the rotation of the second grinding disc, and the shaking inclined cone cylinder is buckled intermittently along with the hemispherical groove, and the top of the second grinding disc is uniformly discharged.
Further, be provided with sealed cover plate on the lateral wall of unloading pipe bottom port department, sealed cover plate and churn assorted, and be provided with the branch material platform on unloading pipe port department inner wall, divide the material platform to be round platform type structure under the upper column, evenly coaxial interval is provided with in the branch material platform and draws the material passageway, the even swing joint in branch material platform bottom of the adjacent department of outside material passageway is drawn, divide material platform middle part department to run through and is provided with the movable rod, movable rod top fixedly connected with cone head, evenly be provided with the movable connecting rod on movable rod bottom department lateral wall, the movable connecting rod end links to each other with hitting the activity of flitch lateral wall, and the winding is provided with elastomeric element on the movable rod outer wall of movable connecting rod top.
Further, the connecting rod is evenly arranged at the bottom of the sealing cover plate, the dispersing and leaking net is fixedly connected to the bottom of the connecting rod and is suspended at the bottom of the material distributing table, and when the elastic component keeps a normal diastole state, the material striking plate is attached to the bottom port of the outermost material guiding channel.
Further, the operation flow of throwing Sn-Ag-Zn alloy powder by the material distributing table is as follows:
s401: the Sn-Ag-Zn alloy powder is intensively fed through a blanking pipe, the alloy powder is dispersed after impacting the conical head, the alloy powder enters different guiding channels of the inner ring and the outer ring of the material distributing table, is fed to a dispersing and leaking net from the guiding channels of different ring layers, and then evenly leaks down to enter the stirring barrel;
s402: the conical head drives the movable rod to drive the elastic component to vibrate after being impacted, the elastic component drives the movable rod to move up and down after vibrating, and the movable connecting rod is utilized to control the intermittent up and down deflection of the material striking plate;
s403, when the material striking plate intermittently deflects up and down, alloy powder corresponding to the material guiding channel slides down, the alloy powder is thrown out when the material striking plate deflects upwards, and the alloy powder falls on the dispersing and leaking net to be evenly leaked.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the high-stability environment-friendly soldering paste and the preparation method thereof, a grinding and screening cylinder is arranged on the side wall of a lifting seat close to the top, a feed hopper is arranged on the outer wall of one side of the grinding and screening cylinder close to the top, the bottom of the feed hopper extends into the grinding and screening cylinder, the tail end of the feed hopper is connected with a blanking device, the upper end of a bottom plate of the grinding and screening cylinder is provided with a first grinding disc, the top of the first grinding disc is provided with a mounting groove, the middle part of the upper end of the bottom plate of the mounting groove is fixedly connected with a first gear, the top of the first gear is movably connected with a transmission part, the second grinding disc is movably clamped and mounted in the mounting groove, the top of the second grinding disc is fixedly connected with a rotating shaft, an aggregate cavity is arranged in the first grinding disc below the mounting groove, the outer wall of two sides of the aggregate cavity is provided with a feed inlet, the feed inlet is close to the tail end of a guide inclined ring on the inner wall of the grinding and screening cylinder, the bottom of the aggregate cavity is provided with a communicating pipe, the communicating pipe extends into the inner cavity of the blanking tube at the bottom of the grinding and screening cylinder, sn-Ag-Zn alloy powder is thrown into the feed hopper, the Sn-Ag-Zn alloy powder is fixedly connected into the blanking device for blanking device, the uniform speed, the second grinding pulley is driven to rotate, the second grinding pulley is driven by the rotating belt, and the second grinding pulley is meshed with the second belt, and the second belt pulley is driven to rotate, and the second belt pulley and the second belt drives the second grinding pulley to rotate, and the second belt pulley rotates; the alloy powder falls into a fine gap between the second grinding disc and the inner wall of the grinding and sieving cylinder due to centrifugal force after falling on the top of the second grinding disc, the second grinding disc finely grinds the large-particle-size powder when rotating, the alloy powder with smaller particle size falls into the fine gap between the first grinding disc and the inner wall of the grinding and sieving cylinder, and the first grinding disc rotates and grinds the alloy powder more quickly; the alloy powder is subjected to rotary milling through a first millstone and then is compounded and compounded to meet the use requirement, and then the alloy powder with qualified particle size falls into a material guiding inclined ring on the inner wall of a milling and screening cylinder and slides down into a feed inlet on the side wall of the first millstone along the inner wall of the material guiding inclined ring; alloy powder enters into the inside chamber that gathers materials of first mill through the feed inlet, later along the chamber sloping inner wall landing that gathers materials in communicating pipe, guide the unloading in the unloading pipe that gets into the screening section of thick bamboo bottom of milling through communicating pipe, utilize the differential rotation of first mill and second mill to effectively grind the alloy powder, rotatory drive glassware carries out synchronous even unloading simultaneously, realizes the coordinated control of mill rotation and unloading, convenient practicality.
2. According to the high-stability environment-friendly soldering paste and the preparation method thereof, the installation sleeve is movably sleeved on the outer wall of the rotating shaft, the middle rotary drum is arranged on the outer wall of one side of the installation sleeve, the material receiving pipe is arranged at the top of the middle rotary drum, the top end of the material receiving pipe is fixedly connected with the tail end of the bottom part of the feeding hopper, the bottom part of the middle rotary drum is provided with the shaking oblique cone through the flexible connecting part, the tail end of the shaking oblique cone is arranged towards the edge of the second grinding disc, the outer wall of one side of the middle rotary drum, which is far away from the port of the shaking oblique cone, is provided with the fixed drum, the tail end of the L-shaped hanging rod is movably sleeved in the port of the bottom part of the fixed drum, the tail end of the L-shaped hanging rod is fixedly connected with the shaking ball, the hemispherical groove is uniformly arranged at the position of the top part of the second grinding disc, which corresponds to the shaking ball is annularly, the side wall of the vertical rod of the L-shaped hanging rod is fixedly connected with the shaking stirring plate, the tail end of the shaking plate is closely suspended at the bottom part of the shaking oblique cone, the shaking plate is fixedly connected with the outer wall of the L-shaped hanging rod between the shaking plate and the port of the fixed drum, the shaking plate is provided with the buffer spring, sn-Ag-Zn alloy powder enters the middle rotary drum through the feeding hopper and the material receiving pipe, when the material is rotated into the middle drum, the hemispherical material is; when the shaking stirring plate moves upwards, the tail end of the shaking stirring plate upwards dials and lifts the shaking inclined cone cylinder, so that the port at the bottom of the shaking inclined cone cylinder is separated from the top surface of the second grinding disc, and alloy powder in the middle rotating cylinder slides to the top of the rotating second grinding disc through the shaking inclined cone cylinder when the second grinding disc rotates; the end of the shaking stirring plate stops stirring and lifting the shaking inclined cone cylinder, the bottom end port of the shaking inclined cone cylinder is attached to the top surface of the second grinding disc to stop discharging, the shaking inclined cone cylinder is buckled intermittently along with the hemispherical groove of which the top is annularly arranged when the second grinding disc rotates, the top of the second grinding disc is uniformly discharged, the alloy powder is uniformly ground by the grinding disc, and excessive blocking of the grinding disc is prevented.
3. According to the high-stability environment-friendly soldering tin paste and the preparation method thereof, the side wall at the bottom end opening of the blanking pipe is provided with the sealing cover plate, the inner wall at the bottom end opening of the blanking pipe is provided with the material distribution table, the material distribution table is internally provided with the material guide channels at uniform coaxial intervals, the bottom of the material distribution table adjacent to the material distribution channel at the outermost side is uniformly and movably connected with the material striking plate, the middle part of the material distribution table is provided with the movable rod in a penetrating way, the top of the movable rod is fixedly connected with the conical head, the side wall at the bottom of the movable rod is uniformly provided with the movable connecting rod, the tail end of the movable connecting rod is movably connected with the side wall of the material striking plate, the outer wall of the movable rod above the movable connecting rod is wound with an elastic part, the bottom of the sealing cover plate is uniformly provided with the connecting rod, the bottom of the connecting rod is fixedly connected with the dispersing screen, the dispersing screen is suspended at the bottom of the material distribution table, the sealing cover plate covers the stirring cylinder end opening, sn-Ag-Zn alloy powder is intensively thrown through the blanking pipe, the alloy powder is dispersed after impacting the conical head, the alloy powder enters different material guide channels in the material distribution table, and is thrown into the different circle guide channels of the material distribution channels at different circle layers, and uniformly and leaks into the stirring cylinder; the conical head drives the movable rod to drive the elastic component to vibrate after being impacted, the elastic component drives the movable rod to move up and down after vibrating, and the movable connecting rod is utilized to control the intermittent up and down deflection of the material striking plate; when the material beating plate intermittently deflects up and down, alloy powder in the corresponding material guiding channel slides down, the material beating plate is thrown out when deflecting upwards, the alloy powder falls on the dispersing screen to be evenly leaked down after being thrown, under the relatively sealed environment, the material guiding channels with different inner and outer rings of the material distributing table are utilized to guide the material beating plate to beat and throw, the material beating plate is used for blanking while grinding, the alloy powder falling down is evenly dispersed to different parts of the stirring cylinder, the problem that the mixing efficiency is influenced by the forming of wrapping blocks by the concentrated throwing of the alloy powder is prevented, and the rapid and uniform mixing of the alloy powder and the soldering flux is promoted.
Drawings
FIG. 1 is a weight ratio chart of solder paste components according to the invention;
FIG. 2 is a flow chart of the solder paste preparation process of the present invention;
FIG. 3 is a schematic diagram of the whole structure of the solder paste production device of the present invention;
FIG. 4 is a cross-sectional view of a milling and screening drum of the present invention;
FIG. 5 is a schematic view of the mounting structure of the blanking device of the present invention;
FIG. 6 is a schematic view of the mounting structure of the first and second abrasive discs of the present invention;
FIG. 7 is a cross-sectional view of a first abrasive disc of the present invention;
FIG. 8 is a schematic view of the inverted structure of the second abrasive disc of the present invention;
FIG. 9 is a schematic diagram of a driving member according to the present invention;
FIG. 10 is a schematic view of the structure of the blanking device of the present invention;
fig. 11 is a schematic view of a mounting structure of a material distributing table according to the present invention.
In the figure: 1. a support plate; 2. a stirring cylinder; 3. a lifting seat; 4. grinding and screening cylinders; 5. a feed hopper; 6. a blanking device; 61. a mounting sleeve; 62. a middle drum; 63. a material receiving pipe; 64. shaking the inclined cone barrel; 65. a fixed cylinder; 66. an L-shaped suspender; 67. shaking the balls; 68. shaking the material shifting plate; 69. a buffer spring; 7. a first abrasive disc; 8. a mounting groove; 9. a first gear; 10. a transmission member; 101. a second gear; 102. a connecting shaft; 103. a positioning sleeve; 104. an L-shaped connecting rod; 105. a second pulley; 106. a drive belt; 11. a second abrasive disc; 12. a first pulley; 13. a rotating shaft; 14. a collection chamber; 15. a feed inlet; 16. a material guiding inclined ring; 17. a communicating pipe; 18. discharging pipes; 19. a hemispherical groove; 20. a sealing cover plate; 21. a material distributing table; 22. a material guiding channel; 23. a striking plate; 24. a movable rod; 25. a conical head; 26. a movable connecting rod; 27. an elastic member; 28. a connecting rod; 29. and dispersing the leaking net.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to solve the problem that the solder paste prepared by mixing the solder powder with the oversized particle size and the soldering flux affects the soldering stability of electronic elements when the conventional solder paste is processed to prepare the tin powder, please refer to fig. 1-9, the following preferred technical scheme is provided:
the high-stability environment-friendly soldering paste is formed by mixing Sn-Ag-Zn alloy powder serving as solder and soldering flux, wherein the weight percentage of the Sn-Ag-Zn alloy powder is 85% -90%, and the weight percentage of the soldering flux is as follows: 30% -40% of rosin; 2% -5% of a connecting agent; 3% -5% of an activating agent; 6% -10% of thixotropic agent; 0.5% -0.7% of antioxidant; 35% -45% of solvent; 0.3% -0.5% of complexing agent.
A preparation method of high-stability environment-friendly soldering paste comprises the following steps:
s1: preparing raw materials for preparing the solder paste according to a proportioning table, quantitatively weighing Sn-Ag-Zn alloy powder, rosin, a connecting agent, an activating agent, a thixotropic agent, an antioxidant, a solvent and a complexing agent, and reserving after weighing;
s2: after the raw materials are extracted, putting rosin, a solvent and a complexing agent into a reaction container, dissolving and uniformly stirring the rosin in an environment of 120-140 ℃, cooling the rosin to 40-70 ℃ after the rosin is dissolved, continuously adding a connecting agent, an activating agent, a thixotropic agent and an antioxidant to uniformly stir, cooling to room temperature after the solution components are completely clarified, and standing for 24 hours to prepare the soldering flux;
s3: taking out the weighed Sn-Ag-Zn alloy powder, placing the Sn-Ag-Zn alloy powder into a solder paste production device, grinding and screening the alloy powder, ensuring that the particle size of the alloy powder meets the compound preparation requirement, and putting the prepared soldering flux into a reaction cylinder at the lower part of the production device;
s4: screening Sn-Ag-Zn alloy powder, uniformly throwing the powder into a reaction cylinder, stirring and mixing the powder and soldering flux while throwing the powder, and uniformly cooling the mixture to room temperature to obtain tin paste;
s5: and (3) filling after the solder paste is prepared, sealing and preserving the solder paste after filling, and storing the solder paste in a low-temperature environment after sealing and packaging.
The solder paste production device comprises a supporting plate 1 and a stirring cylinder 2 arranged at the top of the supporting plate 1, wherein the top of the supporting plate 1 adjacent to the stirring cylinder 2 is provided with a lifting seat 3, a grinding and screening cylinder 4 is arranged on the side wall of the lifting seat 3 close to the top, a feed hopper 5 is arranged on the outer wall of one side of the grinding and screening cylinder 4 and close to the top, the bottom of the feed hopper 5 extends into the grinding and screening cylinder 4, the end of the feed hopper is connected with a blanking device 6, the upper end of the bottom plate of the grinding and screening cylinder 4 is provided with a first grinding disc 7, the top of the first grinding disc 7 is provided with a mounting groove 8, the middle part of the upper end of the bottom plate of the mounting groove 8 is fixedly connected with a first gear 9, the first gear 9 is movably connected with a transmission member 10, the top of the transmission member 10 is movably connected with a first belt pulley 12 at the bottom of a second grinding disc 11, the movable clamping is arranged in the mounting groove 8, the diameter of the second grinding disc 11 is smaller than that of the first grinding disc 7, the top of the second grinding disc 11 is fixedly connected with a rotating shaft 13, the inner part of the first grinding disc 7 below the mounting groove 8 is internally provided with an aggregate cavity 14, the outer wall of the first grinding disc 14 is provided with a feed inlet 15, the two side walls of the aggregate cavity 15 are provided with feed inlets 16, the feed-through holes 16 are close to the feed-down control bevel ring 16 on the outer walls of the aggregate cavity 14, the feed inlet 15 are arranged close to the inner walls of the grinding and the feed channel 4, the feed channel 16 is provided with an automatic control feed tube 18, and the feed channel 18 runs through the feed channel 18 and the feed channel is arranged at the bottom of the feed channel 18.
The driving medium 10 is including placing the second gear 101 in first gear 9 one side mounting groove 8 bottom plate upper end, second gear 101 meshes with first gear 9 mutually, and second gear 101 top fixedly connected with connecting axle 102, the activity has cup jointed locating sleeve 103 on the outer wall of connecting axle 102, fixedly connected with L type connecting rod 104 on the outer wall of one side of locating sleeve 103, extend to communicating pipe 17 port outside after the terminal end of L type connecting rod 104 runs through first gear 9 and first mill 7, and through dead lever and unloading pipe 18 inner wall fixed connection, the top fixedly connected with second belt pulley 105 of connecting axle 102, second belt pulley 105 cup joints with first belt pulley 12 of second mill 11 bottom through driving belt 106 mutually, second belt pulley 105 diameter is less than first belt pulley 12 diameter.
Specifically, sn-Ag-Zn alloy powder is put into a feed hopper 5, the Sn-Ag-Zn alloy powder slides into a blanking device 6 for uniform blanking, then a rotating shaft 13 is started to drive a second grinding disc 11 to rotate, the second grinding disc 11 drives a second belt pulley 105 to rotate through a first belt pulley 12 and a transmission belt 106, and the second belt pulley 105 drives a first grinding disc 7 to rotate in a differential speed by using a second gear 101 below the second belt pulley to engage a first gear 9; after the alloy powder falls on the top of the second grinding disc 11, the alloy powder slides into a fine gap between the second grinding disc 11 and the inner wall of the grinding and sieving cylinder 4 due to centrifugal force, when the second grinding disc 11 rotates, the large-particle-size powder is finely ground, the alloy powder with smaller particle size falls into the fine gap between the first grinding disc 7 and the inner wall of the grinding and sieving cylinder 4, and the first grinding disc 7 rotates and rolls the alloy powder more quickly; the alloy powder is subjected to rotary grinding through the first grinding disc 7 and then is compounded and compounded to meet the use requirement, then the alloy powder with qualified particle size falls into a material guiding inclined ring 16 on the inner wall of the grinding and screening cylinder 4, and slides down into a feed inlet 15 on the side wall of the first grinding disc 7 along the inner wall of the material guiding inclined ring 16; alloy powder enters the aggregate cavity 14 inside the first grinding disc 7 through the feed inlet 15, then slides into the communicating pipe 17 along the inclined inner wall of the aggregate cavity 14, is guided into the blanking pipe 18 at the bottom of the grinding and screening cylinder 4 through the communicating pipe 17 to be blanked, and effectively grinds the alloy powder by utilizing differential rotation of the first grinding disc 7 and the second grinding disc 11, and simultaneously, the blanking device 6 is driven to synchronously and uniformly blanked by rotation, so that linkage control of grinding disc rotation and blanking is realized, and the device is convenient and practical.
In order to realize uniform blanking of alloy powder so that grinding and screening are carried out on the grinding disc, as shown in fig. 5-6 and 10, the following preferable technical scheme is provided:
the blanking device 6 comprises a mounting sleeve 61 movably sleeved on the outer wall of the rotating shaft 13 and a transfer cylinder 62 fixedly connected to the outer wall of one side of the mounting sleeve 61, a receiving pipe 63 is arranged at the top of the transfer cylinder 62, the top end of the receiving pipe 63 is fixedly connected with the tail end of the bottom of the feeding hopper 5, a shaking inclined cone cylinder 64 is arranged at the bottom of the transfer cylinder 62 through a flexible connection part, the tail end of the shaking inclined cone cylinder 64 faces the edge of the second grinding disc 11, a fixed cylinder 65 is arranged on the outer wall of one side, far away from the port of the shaking inclined cone cylinder 64, of the middle cylinder 62, an L-shaped suspender 66 is movably sleeved in the port of the bottom of the fixed cylinder 65, shaking balls 67 are fixedly connected to the bottom of the L-shaped suspender 66, hemispherical grooves 19 are uniformly formed in the positions of the bottom of the L-shaped suspender 66 corresponding to the shaking balls 67, shaking plates 68 are fixedly connected to the side walls of the vertical rods of the L-shaped suspender 66, the tail ends of the shaking plates 68 are pressed close to the bottoms of the shaking inclined cone cylinder 64, buffer springs 69 are arranged on the outer wall of the L-shaped vertical rods 66 between the shaking plates 68 and the ports of the fixed cylinder 65, and the buffer springs 69 are buckled in the hemispherical grooves 19 when the buffer springs 69 keep normal states.
Specifically, sn-Ag-Zn alloy powder enters the transfer cylinder 62 through the feed hopper 5 and the material receiving pipe 63, and when the second grinding disc 11 rotates, the hemispherical groove 19 at the top of the second grinding disc is intermittently buckled with the shaking ball 67 at the tail end of the L-shaped suspender 66, and the shaking ball 67 drives the buffer spring 69 to vibrate through the hemispherical groove 19, so that the shaking stirring plate 68 moves up and down along with the L-shaped suspender 66; when the shaking plate 68 moves upwards, the tail end of the shaking plate is upwards stirred to lift the shaking inclined cone cylinder 64, so that the bottom port of the shaking inclined cone cylinder 64 is separated from the top surface of the second grinding disc 11, and alloy powder in the transfer cylinder 62 slides down to the top of the rotating second grinding disc 11 through the shaking inclined cone cylinder 64 when the second grinding disc 11 rotates; the tail end of the shaking stirring plate 68 stops stirring and lifting the shaking inclined cone cylinder 64 when the shaking stirring plate 68 is arranged below, the bottom end port of the shaking inclined cone cylinder 64 is attached to the top surface of the second grinding disc 11 to stop discharging, the shaking inclined cone cylinder 64 is stirred and shaken by the hemispherical groove 19 which is arranged annularly along with the rotation of the top of the second grinding disc 11, the top of the second grinding disc 11 is uniformly discharged, the alloy powder is uniformly ground by the grinding disc, and excessive clamping of the grinding disc is prevented.
In order to achieve effective and uniform mixing of the alloy powder and the flux, as shown in fig. 3 and 11, the following preferred technical solutions are provided:
the side wall of the port of the bottom of the blanking pipe 18 is provided with a sealing cover plate 20, the sealing cover plate 20 is matched with the stirring barrel 2, the inner wall of the port of the blanking pipe 18 is provided with a material distribution table 21, the material distribution table 21 is of an upper column and lower round table type structure, material guiding channels 22 are uniformly and coaxially arranged in the material distribution table 21 at intervals, the bottom of the material distribution table 21 adjacent to the outermost material guiding channels 22 is uniformly and movably connected with a material striking plate 23, the middle part of the material distribution table 21 is penetrated and provided with a movable rod 24, the top of the movable rod 24 is fixedly connected with a conical head 25, the side wall of the bottom of the movable rod 24 is uniformly provided with a movable connecting rod 26, the tail end of the movable connecting rod 26 is movably connected with the side wall of the material striking plate 23, and an elastic part 27 is wound on the outer wall of the movable rod 24 above the movable connecting rod 26.
The bottom of the sealing cover plate 20 is uniformly provided with a connecting rod 28, the bottom of the connecting rod 28 is fixedly connected with a dispersing and leaking net 29, the dispersing and leaking net 29 is suspended at the bottom of the material distributing table 21, and when the elastic component 27 keeps a normal diastole state, the material striking plate 23 is attached to the bottom port of the outermost material guiding channel 22.
Specifically, the sealing cover plate 20 covers the port of the stirring cylinder 2, sn-Ag-Zn alloy powder is intensively put in through the blanking pipe 18, the alloy powder is dispersed after impacting the conical head 25, the alloy powder enters different material guiding channels 22 of the inner ring and the outer ring of the material distributing table 21, is thrown to a dispersing and leaking net 29 from the material guiding channels 22 of different ring layers, and then evenly leaks down to enter the stirring cylinder 2; the conical head 25 is impacted to drive the movable rod 24 to drive the elastic component 27 to vibrate, the elastic component 27 drives the movable rod 24 to move up and down after vibrating, and the movable connecting rod 26 is utilized to control the intermittent up and down deflection of the striking plate 23; when the material beating plate 23 intermittently deflects up and down, alloy powder in the corresponding material guiding channel 22 slides down, the material beating plate 23 is thrown out when deflected upwards, the alloy powder falls on the dispersing and leaking net 29 after being thrown out and evenly leaks down, under the relatively sealed environment, the material beating plate is guided by the material guiding channels 22 with different inner and outer rings of the material distributing table 21 and the material beating plate 23 deflects, the material beating and throwing are carried out while grinding, the alloy powder falling down is evenly dispersed to different positions of the stirring cylinder 2, the problem that the mixing efficiency is influenced by the forming of a package block by the concentrated throwing of the alloy powder is prevented, and the rapid and even mixing of the alloy powder and the soldering flux is promoted.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The preparation method of the high-stability environment-friendly soldering paste comprises the step of mixing Sn-Ag-Zn alloy powder serving as solder with soldering flux, wherein the weight percentage of the Sn-Ag-Zn alloy powder is 85% -90%, and the weight percentage of the soldering flux is as follows: 30% -40% of rosin; 2% -5% of a connecting agent; 3% -5% of an activating agent; 6% -10% of thixotropic agent; 0.5% -0.7% of antioxidant; 35% -45% of solvent; complexing agent 0.3% -0.5%, its characterized in that: the method comprises the following steps:
s1: preparing raw materials for preparing the solder paste according to a proportioning table, quantitatively weighing Sn-Ag-Zn alloy powder, rosin, a connecting agent, an activating agent, a thixotropic agent, an antioxidant, a solvent and a complexing agent, and reserving after weighing;
s2: after the raw materials are extracted, putting rosin, a solvent and a complexing agent into a reaction container, dissolving and uniformly stirring the rosin in an environment of 120-140 ℃, cooling the rosin to 40-70 ℃ after the rosin is dissolved, continuously adding a connecting agent, an activating agent, a thixotropic agent and an antioxidant to uniformly stir, cooling to room temperature after the solution components are completely clarified, and standing for 24 hours to prepare the soldering flux;
s3: taking out the weighed Sn-Ag-Zn alloy powder, placing the Sn-Ag-Zn alloy powder into a solder paste production device, grinding and screening the alloy powder, ensuring that the particle size of the alloy powder meets the compound preparation requirement, and putting the prepared soldering flux into a reaction cylinder at the lower part of the production device;
s4: screening Sn-Ag-Zn alloy powder, uniformly throwing the powder into a reaction cylinder, stirring and mixing the powder and soldering flux while throwing the powder, and uniformly cooling the mixture to room temperature to obtain tin paste;
s5: filling after the solder paste is prepared, sealing and preserving the solder paste after filling, and storing the solder paste in a low-temperature environment after sealing and packaging;
the solder paste production device comprises a supporting plate (1) and a stirring cylinder (2) arranged at the top of the supporting plate (1), a lifting seat (3) is arranged at the top of the supporting plate (1) adjacent to the stirring cylinder (2), a grinding and screening cylinder (4) is arranged on the side wall of the lifting seat (3) close to the top, a feed hopper (5) is arranged on the outer wall of one side of the grinding and screening cylinder (4) close to the top, the bottom of the feed hopper (5) extends into the grinding and screening cylinder (4), a feeder (6) is connected to the tail end of the feed hopper, a first grinding disc (7) is arranged at the upper end of a bottom plate of the grinding and screening cylinder (4), a mounting groove (8) is formed in the top of the first grinding disc (7), a first gear (9) is fixedly connected to the middle part of the upper end of the bottom plate of the mounting groove (8), a first gear (9) is movably connected with a transmission piece (10), the top of the transmission piece (10) is movably connected with a first belt pulley (12) at the bottom of a second grinding disc (11), the second grinding disc (11) is movably clamped in the mounting groove (8), the diameter of the second grinding disc (11) is smaller than the diameter of the first grinding disc (7), the second grinding disc (11) is fixedly connected with the top of the first grinding disc (11), aggregate (14) is fixedly connected with the upper side of the first grinding disc (14), a feed cavity (14) is formed in the inner cavity (14) and is formed in the inner cavity (14), the feeding port (15) is close to the tail end of a material guiding inclined ring (16) on the inner wall of the grinding and screening cylinder (4), a communicating pipe (17) is arranged at the bottom of the material collecting cavity (14), and the communicating pipe (17) penetrates through the inner cavity of a discharging pipe (18) extending to the bottom of the grinding and screening cylinder (4);
the transmission piece (10) is including placing in second gear (101) of first gear (9) one side mounting groove (8) bottom plate upper end, second gear (101) meshes with first gear (9), and second gear (101) top fixedly connected with connecting axle (102), the activity has cup jointed spacer sleeve (103) on the outer wall of connecting axle (102), fixedly connected with L type connecting rod (104) on one side outer wall of spacer sleeve (103), extend to communicating pipe (17) port outside after L type connecting rod (104) terminal runs through first gear (9) and first mill (7), and through dead lever and unloading pipe (18) inner wall fixed connection, the top fixedly connected with second belt pulley (105) of connecting axle (102), second belt pulley (105) cup joint with first belt pulley (12) of second mill (11) bottom through driving belt (106), second belt pulley (105) diameter is less than first belt pulley (12) diameter.
2. The method for preparing the high-stability environment-friendly solder paste as claimed in claim 1, wherein the method comprises the following steps: the steps of grinding and sieving the Sn-Ag-Zn alloy powder are as follows:
s301: sn-Ag-Zn alloy powder is put into a feed hopper (5), the Sn-Ag-Zn alloy powder slides into a blanking device (6) for uniform speed blanking, then a rotating shaft (13) is started to drive a second grinding disc (11) to rotate, the second grinding disc (11) drives a second belt pulley (105) to rotate through a first belt pulley (12) and a transmission belt (106), and the second belt pulley (105) drives a first grinding disc (7) to rotate in a differential speed mode by using a second gear (101) below the second belt pulley to engage with a first gear (9);
s302: the alloy powder falls into a fine gap between the second grinding disc (11) and the inner wall of the grinding and sieving cylinder (4) due to centrifugal force after falling, the second grinding disc (11) carries out fine grinding on large-particle-size powder when rotating, the alloy powder with smaller particle size falls into the fine gap between the first grinding disc (7) and the inner wall of the grinding and sieving cylinder (4), and the first grinding disc (7) carries out faster rotating grinding on the alloy powder;
s303: the alloy powder is subjected to rotary grinding through a first grinding disc (7) and then is compounded and compounded with the use requirement, then the alloy powder with qualified particle size falls into a material guiding inclined ring (16) on the inner wall of a grinding and screening cylinder (4), and slides downwards into a feed inlet (15) on the side wall of the first grinding disc (7) along the inner wall of the material guiding inclined ring (16);
s304: alloy powder enters an aggregate cavity (14) in the first grinding disc (7) through a feed inlet (15), then slides into a communicating pipe (17) along the inclined inner wall of the aggregate cavity (14), and is guided into a blanking pipe (18) at the bottom of the grinding and sieving cylinder (4) through the communicating pipe (17) for blanking.
3. The method for preparing the high-stability environment-friendly solder paste as claimed in claim 2, wherein the method comprises the following steps: the blanking device (6) comprises a mounting sleeve (61) movably sleeved on the outer wall of the rotating shaft (13) and a transfer cylinder (62) fixedly connected on the outer wall of one side of the mounting sleeve (61), a material receiving pipe (63) is arranged at the top of the transfer cylinder (62), the top of the material receiving pipe (63) is fixedly connected with the tail end of the bottom of the feeding hopper (5), a shaking inclined cone (64) is arranged at the bottom of the transfer cylinder (62) through a flexible connecting part, the tail end of the shaking inclined cone (64) faces the edge of the second grinding disc (11), a fixed cylinder (65) is arranged on the outer wall of one side of the middle rotating cylinder (62) far away from the shaking inclined cone (64), an L-shaped hanging rod (66) is movably sleeved in the port at the bottom of the fixed cylinder (65), shaking balls (67) are fixedly connected at the tail end of the L-shaped hanging rod (66), hemispherical grooves (19) are uniformly arranged at the corresponding positions of the bottom of the second grinding disc (11), shaking stirring plates (68) are fixedly connected on the side walls of the L-shaped hanging rod (66), the tail ends of the shaking plates (68) are close to the bottoms of the shaking inclined cone (64) and the elastic shaking plates (69) are kept in a normal state when the hanging rods (69) are arranged on the outer wall of the hanging rods (69), the shaking ball (67) is buckled in the hemispherical groove (19).
4. A method for preparing a high stability environmental protection solder paste according to claim 3, wherein: the blanking step of the blanking device (6) is as follows:
s3011: sn-Ag-Zn alloy powder enters the transfer cylinder (62) through the feed hopper (5) and the material receiving pipe (63), a hemispherical groove (19) at the top of the second millstone (11) is intermittently buckled with a shaking ball (67) at the tail end of the L-shaped suspender (66) when the second millstone rotates, and the shaking ball (67) drives the buffer spring (69) to vibrate through the hemispherical groove (19) to enable the shaking stirring plate (68) to move up and down along with the L-shaped suspender (66);
s3012: when the shaking stirring plate (68) moves upwards, the tail end of the shaking stirring plate upwards lifts the shaking inclined cone (64) so that the bottom port of the shaking inclined cone (64) is separated from the top surface of the second grinding disc (11), and alloy powder in the transfer cylinder (62) slides to the top of the rotating second grinding disc (11) through the shaking inclined cone (64) when the second grinding disc (11) rotates;
s3013: and when the shaking stirring plate (68) is arranged below, the tail end of the shaking stirring plate stops stirring and lifting the shaking inclined cone (64), the bottom port of the shaking inclined cone (64) is attached to the top surface of the second grinding disc (11) to stop discharging, and as the second grinding disc (11) rotates, the hemispherical groove (19) which is annularly arranged at the top is intermittently buckled with the shaking balls (67) to shake the shaking inclined cone (64), and the top of the second grinding disc (11) is uniformly discharged.
5. The method for preparing the high-stability environment-friendly solder paste as claimed in claim 1, wherein the method comprises the following steps: be provided with sealed cover plate (20) on the lateral wall of unloading pipe (18) bottom port department, sealed cover plate (20) and churn (2) assorted, and be provided with branch material platform (21) on unloading pipe (18) port department inner wall, branch material platform (21) are the round platform type structure under the upper column, evenly coaxial interval is provided with in branch material platform (21) and draws material passageway (22), evenly swing joint in branch material platform (21) bottom of the adjacent department of outside draw material passageway (22) has hits flitch (23), it runs through in branch material platform (21) middle part department and is provided with movable rod (24), movable rod (24) top fixedly connected with conical head (25), evenly be provided with movable connecting rod (26) on movable rod (24) bottom department lateral wall, movable connecting rod (26) end links to each other with hits flitch (23) lateral wall activity, and the winding is provided with elastomeric element (27) on movable rod (24) outer wall above movable connecting rod (26).
6. The method for preparing the high-stability environment-friendly solder paste as claimed in claim 5, wherein the method comprises the following steps: the bottom of the sealing cover plate (20) is uniformly provided with a connecting rod (28), the bottom of the connecting rod (28) is fixedly connected with a dispersion leakage net (29), the dispersion leakage net (29) is suspended at the bottom of the material distributing table (21), and when the elastic component (27) keeps a normal diastole state, the material striking plate (23) is attached to the bottom port of the outermost material guiding channel (22).
7. The method for preparing the high-stability environment-friendly solder paste as claimed in claim 6, wherein the method comprises the following steps: the operation flow of throwing Sn-Ag-Zn alloy powder by the material distributing table (21) is as follows:
s401: the Sn-Ag-Zn alloy powder is intensively put in through a blanking pipe (18), the alloy powder is dispersed after impacting a conical head (25), the alloy powder enters different material guiding channels (22) of the inner ring and the outer ring of a material distributing table (21), is thrown to a dispersing leakage net (29) from the material guiding channels (22) of different ring layers, and then uniformly leaks down to enter a stirring cylinder (2);
s402: the conical head (25) drives the movable rod (24) to drive the elastic component (27) to vibrate after being impacted, the elastic component (27) drives the movable rod (24) to move up and down after vibrating, and the movable connecting rod (26) is utilized to control the material striking plate (23) to intermittently deflect up and down;
s403, when the material striking plate (23) intermittently deflects up and down, alloy powder corresponding to the material guiding channel (22) slides down, the alloy powder is thrown out when the material striking plate (23) deflects upwards, and the alloy powder falls on the dispersing and leaking net (29) after being thrown out and evenly leaks.
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