High-reliability low-sintering-temperature silver-copper co-sintering paste grinding device

Abstract

The application relates to the field of slurry grinding technology, and discloses a high-reliability low-sintering-temperature silver-copper co-sintering slurry grinding device.The device comprises a shell and internal support rollers, four groups of grinding rollers are arranged around the periphery of the support rollers, adjacent reverse rotation is realized through gear transmission structure driving, the rotating speed gradually increases, and the roller gap gradually decreases; an adjusting assembly is arranged at the end of the grinding assembly, the four rollers can be driven to synchronously contract or expand, the preset gap gradient can be accurately maintained during gap adjustment; a feeding assembly with an opening and closing plate is arranged at the gap between the first roller and the second roller, a side arrangement material assembly is arranged at the side of the shell, and a limiting scraper is arranged at the side of the support roller; the device realizes step-by-step fine grinding of the slurry, greatly reduces slurry dripping waste, can complete automatic circulation grinding under the same gap level, improves the efficiency and precision of gap adjustment; inert gas can be introduced into the closed shell, copper phase oxidation is effectively inhibited, the purity and use performance of the electronic-grade silver-copper co-sintering slurry are ensured, and the grinding process requirements are met.

Description

Technical Field

[0001] This invention relates to the field of slurry grinding technology, and in particular to a highly reliable, low-sintering-temperature silver-copper co-fired slurry grinding device. Background Technology

[0002] The grinding of silver-copper co-fired slurry is primarily achieved using a three-roll mill, which is the mainstream equipment in the industry. This equipment allows for independent and precise control of the gaps between the rear and middle rollers, and between the middle and front rollers, through a micron-level precision adjustment mechanism. By leveraging the speed ratio between the rollers to create a suitable shearing and extrusion force, it can adapt to the high solids content and high viscosity rheological characteristics of the silver-copper co-fired slurry. It is the core equipment for achieving fine dispersion and homogenization of the slurry powder. Because the silver-copper co-fired slurry contains silver-coated copper core-shell particles, it is necessary to avoid damage to the silver layer and oxidation of the copper core during grinding. Furthermore, to ensure uniform grinding fineness and the absence of large particle agglomerates, this grinding device is used. The principle of gradient gap adjustment must be followed. The gap between the two sets of rollers is set to a fixed gradient that decreases step by step to form different gap levels. The slurry must be circulated through the rollers for grinding two to three times at the same gap level. After the soft agglomerates are fully dispersed and the fineness of the slurry reaches the corresponding standard of the level, the machine is stopped and the gap is reduced to enter the next level of grinding. Through this graded and cyclic grinding method, the slurry is ground into ultrafine particles while protecting the integrity of the silver-coated copper core-shell structure to the maximum extent, suppressing the oxidation of the copper phase caused by grinding heat, and meeting the stringent requirements of silver-copper co-fired slurry for grinding precision and material properties.

[0003] In existing technologies, when using a three-roll mill to grind silver-copper co-fired slurry, two to three cycles of grinding are required at the same gap level to ensure uniform dispersion and absence of large particle agglomerates. This process relies on manual operation, and adjusting the gap level between the rollers requires separate adjustments to both sets of roller gaps and their ends, making the operation cumbersome. Furthermore, the three-roll mill has an open operating structure, and the slurry is exposed to the environment throughout the entire process from grinding and manual transfer to refeeding, making it difficult to establish an effective closed inert gas protection system. The slurry is in contact with the air over a large area for a long time, and the grinding heat generated during the grinding and shearing process significantly accelerates the oxidation rate of the copper phase in the slurry, affecting and reducing the purity of the electronic-grade silver-copper co-fired slurry. Summary of the Invention

[0004] The technical problem this invention aims to solve is that existing technologies using three-roll mills to grind silver-copper co-fired slurries have several drawbacks. Firstly, manual grinding at the same gap level is required for cyclic grinding. Secondly, adjusting the gap level requires separate operation of two sets of gaps and their ends, making the overall operation cumbersome. Thirdly, the open structure of the equipment exposes the entire process of slurry grinding, transfer, and refeeding, making it difficult to establish an effective closed inert gas protection system. Fourthly, the slurry is prone to copper phase oxidation due to contact with air and grinding heat, affecting the purity and performance of the slurry. Therefore, we propose a highly reliable, low-sintering-temperature silver-copper co-fired slurry grinding device.

[0005] To achieve the above objectives, this application adopts the following technical solution: a high-reliability, low-sintering-temperature silver-copper co-fired slurry grinding device, comprising: a shell, a support roller fixedly connected inside the shell, a grinding assembly arranged around the support roller, the grinding assembly comprising four sets of grinding rollers surrounding the support roller, the four sets of grinding rollers being arranged clockwise from the topmost one as roller one, roller two, roller three, and roller four, a gear transmission structure installed at one end of each grinding roller, the gear transmission structure being used to drive roller one, roller two, roller three, and roller four to rotate, and the rotation directions between adjacent sets of grinding rollers being opposite, the speed ratio between roller two, roller three, roller four, and roller one being 1:2:4:8, and the gaps between roller one and roller two, roller two and roller three, roller three and roller four, and roller four and roller one decreasing sequentially;

[0006] An adjustment component is installed at the end of the grinding assembly. The adjustment component is used to drive the four sets of grinding rollers to expand outward or contract inward synchronously, thereby synchronously adjusting the gap between each set of grinding rollers.

[0007] A feeding assembly is provided at the gap between the first roller and the second roller. The feeding assembly includes a hopper, and a discharge port is provided at the bottom of the hopper. An opening and closing plate is provided at the top of the discharge port, and the opening and closing plate is rotatably connected to the hopper.

[0008] Preferably, a limiting scraper is fixedly connected to the side of the support roller, and the top of the limiting scraper contacts the surface of a roller to scrape off the slurry adhering to the surface of the roller.

[0009] Preferably, a fixing plate is provided at the bottom of the discharge port, and the fixing plate is fixedly connected to the hopper. Folding plates are fixedly connected to both ends of the fixing plate and the opening and closing plate.

[0010] Preferably, a pressure sensor is installed inside the opening and closing plate. When the opening and closing plate rotates upward to its maximum angle, the discharge port is in an open state, and the bottom end of the opening and closing plate is in contact with the surface of a roller to block the material on the surface of the roller. When the opening and closing plate rotates downward, the bottom end of the opening and closing plate is in contact with the bottom end of the fixed plate, and the discharge port is closed.

[0011] Preferably, the adjusting component includes a connecting rod rotatably connected inside the support roller. Each end of the connecting rod is provided with a set of umbrella-shaped drive gears, and the umbrella-shaped drive gears are fixedly connected to the connecting rod. The outer wall of the umbrella-shaped drive gears is meshed with four sets of umbrella-shaped transmission gears, and the umbrella-shaped transmission gears correspond one-to-one with the grinding roller.

[0012] Preferably, a rotating rod is fixedly connected to the end of the bevel gear, and a first limiting block is rotatably connected to the outside of the rotating rod. The first limiting block is fixedly connected to the housing and is used to support the rotating rod.

[0013] Preferably, a lead screw is fixedly connected to the end of the rotating rod away from the bevel gear. A ball nut is installed on the outside of the lead screw. A push rod is fixedly connected to the outside of the ball nut. A second limiting block is slidably connected to the outside of the push rod. The second limiting block is fixedly connected to the housing and is used to restrict the push rod to slide only along its axial direction and not rotate.

[0014] Preferably, a bearing is fixedly connected to the end of the push rod, the bearing is sleeved on the end of the grinding roller, and the grinding roller and the bearing are rotatably connected.

[0015] Preferably, a discharge assembly is installed on the side of the housing. The discharge assembly includes a discharge plate, and the top of the discharge plate is slidably connected to the housing. The housing has a discharge port at the position corresponding to the discharge plate. A sealing cover is installed inside the discharge port, and the sealing cover is rotatably connected to the housing.

[0016] Preferably, a slider is fixedly connected to the back of the discharge plate, a groove is slidably connected to the outside of the slider, and a spring is fixedly connected to the bottom of the slider, with the spring disposed inside the groove.

[0017] The technical effects and advantages of this invention are as follows:

[0018] This invention arranges four sets of grinding rollers in a ring inside the housing, employing a gradient design with adjacent counter-rotating rollers, progressively increasing rotational speed, and progressively decreasing gap between rollers. This enables progressively fine grinding of the slurry. Leveraging the spatial advantages of the ring layout, the lower areas of the upper three grinding roller sets are naturally supported by adjacent rollers, with only the bottommost roller set potentially dripping. This significantly reduces the chance of slurry wastage, lowers raw material loss, reduces slurry residue and cleaning difficulty within the equipment, and avoids the risk of cross-contamination. The ring arrangement of each grinding roller set, combined with the openable / closable feeding structure of the opening and closing plate, allows the slurry to automatically return to its initial grinding position after one round of four grinding cycles. This eliminates the need for manual collection and transfer, enabling two to three automatic cyclic grinding cycles at the same gap level. It also eliminates the cumbersome process and labor intensity of traditional manual operation and avoids grinding effect deviations caused by uneven manual material return.

[0019] The device is equipped with an adjustment component that drives the four grinding rollers to retract synchronously by simply rotating the connecting rod. This achieves an overall reduction in the gap between the rollers while precisely maintaining the preset gap gradient for each group. There is no need to adjust the gap of each group or the two ends of the roller body separately, which greatly improves the gap adjustment efficiency, effectively avoids the gap deviation caused by manual adjustment, and ensures the grinding accuracy and stability of the gradient grinding. The entire device is located inside a sealed shell, which can directly introduce inert gas into the shell. It is easy to build an effective inert gas protection system, which can effectively isolate air, inhibit the oxidation reaction of the copper phase during the grinding process, and reduce the introduction of environmental dust and other impurities, thus ensuring the purity and performance of the electronic-grade silver-copper co-fired slurry. Attached Figure Description

[0020] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0021] Figure 1 This is a schematic diagram of the overall internal structure of the present invention;

[0022] Figure 2 This is a three-dimensional structural diagram of the entire invention;

[0023] Figure 3 This is a three-dimensional structural diagram of the grinding component of the present invention;

[0024] Figure 4 This is a cross-sectional structural diagram of the grinding assembly and feeding assembly of the present invention in the feeding state.

[0025] Figure 5 This is a cross-sectional structural diagram of the slurry circulation state of the grinding component and the feeding component of the present invention;

[0026] Figure 6 This is a cross-sectional structural diagram of the feeding assembly part of the present invention;

[0027] Figure 7 This is a schematic cross-sectional view of the overall structure of the present invention;

[0028] Figure 8 This is a schematic diagram of the overall structure of the adjustment component of the present invention;

[0029] Figure 9 This is a cross-sectional structural diagram of the push rod portion of the present invention;

[0030] Figure 10 This is a cross-sectional structural diagram of the material discharge component of the present invention.

[0031] Legend: 1. Housing; 2. Grinding assembly; 3. Adjustment assembly; 4. Feeding assembly; 5. Discharging assembly; 6. Support roller; 7. Limiting scraper; 201. First roller; 202. Second roller; 203. Third roller; 204. Fourth roller; 205. Gear transmission structure; 301. Connecting rod; 302. Umbrella-shaped drive gear; 303. Umbrella-shaped transmission gear; 304. Rotating rod; 305. Lead screw; 306. Ball nut; 307. Push rod; 308. Bearing; 309. First limiting block; 310. Second limiting block; 401. Hopper; 402. Fixing plate; 403. Opening and closing plate; 404. Folding plate; 501. Discharging plate; 502. Sealing cover plate; 503. Slider; 504. Slide groove; 505. Spring. Detailed Implementation

[0032] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0033] Please see Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides a technical solution: a high-reliability, low-sintering-temperature silver-copper co-fired slurry grinding device, comprising: a housing 1, a support roller 6 fixedly connected inside the housing 1, and a grinding assembly 2 arranged around the support roller 6. The grinding assembly 2 includes four sets of grinding rollers surrounding the support roller 6. Each set of grinding rollers has a connector at its end, allowing circulating cooling water to be introduced into it for cooling the grinding rollers and the slurry above them. The four sets of grinding rollers are arranged clockwise from the topmost roller as roller 1 201, roller 202, roller 3 203, roller 4 204, roller 5 205, roller 6 206, roller 7 207, roller 8 208, roller 9 209, roller 1 201, roller 1 202, roller 1 203, roller 1 204, roller 1 205, roller 1 206, roller 1 207, roller 1 208, roller 1 ... Roller 203 and four rollers 204 are equipped with a gear transmission structure 205 at one end of the grinding roller. The gear transmission structure 205 is used to drive roller 201, roller 202, roller 203 and roller 204 to rotate. The rotation directions of adjacent sets of grinding rollers are opposite. The speed ratio between roller 202, roller 203, roller 204 and roller 201 is 1:2:4:8. The gaps between roller 201 and roller 202, roller 202 and roller 203, roller 203 and roller 204, and roller 204 and roller 201 decrease sequentially.

[0034] Please see Figure 4 , Figure 5 and Figure 6As shown, a feeding assembly 4 is provided at the gap between the first roller 201 and the second roller 202. The feeding assembly 4 includes a hopper 401, with a discharge port at the bottom end of the hopper 401. A hinged plate 403 is provided at the top of the discharge port, and the hinged plate 403 is rotatably connected to the hopper 401. A limiting scraper 7 is fixedly connected to the side of the support roller 6. The top end of the limiting scraper 7 contacts the surface of the first roller 201 and is used to scrape off the slurry adhering to the surface of the first roller 201. A fixing plate 402 is provided at the bottom of the discharge port, and the fixing plate 402 is fixedly connected to the hopper 401. Folding plates 404 are fixedly connected to both ends of the fixing plate 402 and the hinged plate 403. A pressure sensor is installed inside the hinged plate 403. 3. When rotated upward to the maximum angle, the discharge port is in an open state, and the bottom end of the opening and closing plate 403 is in contact with the surface of the first roller 201 to block the material on the surface of the first roller 201. At this time, the slurry inside the hopper 401 can be discharged to the grinding roller through the discharge port for grinding. After the slurry that has undergone one round of grinding accumulates to a certain amount between the first roller 201 and the opening and closing plate 403, the feeding of new slurry needs to be stopped, and the second round of grinding of the slurry after the first round of grinding begins. The opening and closing plate 403 is rotated downward, and the bottom end of the opening and closing plate 403 contacts the bottom end of the fixed plate 402, and the discharge port is closed. The slurry that was originally blocked by the opening and closing plate 403 can then re-enter between the first roller 201 and the second roller 202 for the second round of grinding.

[0035] The support roller 6 is surrounded by four sets of grinding rollers. Through a gradient design that gradually increases the rotation speed and gradually decreases the gap between the rollers, it realizes the progressive fine grinding of silver-copper co-fired slurry. It is adapted to the process requirements of slurry from coarse dispersion to fine grinding. While steadily improving the grinding fineness and fully dispersing powder agglomerates, it can effectively control the shear strength and protect the silver-coated copper core-shell structure from damage to the greatest extent. At the same time, relying on the slurry self-circulation path formed by the ring structure, the slurry after grinding between the four sets of rollers can automatically return to roller 201 without any manual collection and transfer. This makes it easy to achieve the requirement of two to three cycles of grinding of silver-copper co-fired slurry at the same gap level. It also eliminates the cumbersome process and labor intensity brought about by traditional manual operation, and avoids the grinding effect deviation caused by uneven manual return of material, thus improving the uniformity and consistency of grinding of the same batch of slurry.

[0036] In addition, the self-circulating closed-loop grinding structure abandons the open operation mode of the traditional three-roll mill. The whole structure is located inside the shell 1, and inert gas is directly introduced into the shell 1. It is easy to build a closed inert gas protection system, which can effectively isolate air, inhibit the oxidation reaction of copper phase during grinding, and reduce the introduction of environmental dust and other impurities, ensuring the purity and performance of electronic-grade silver-copper co-fired slurry.

[0037] In existing three-roll mills used for grinding silver-copper co-fired slurries, the three grinding rollers are arranged horizontally and parallel. Each roller has half of its surface exposed at the bottom during operation. As the slurry rotates to the lower position, gravity causes it to easily detach from the roller surface and drip onto the bottom plate. These three dripping points not only significantly increase the waste of high-value silver-copper co-fired slurry but also result in slurry residue on the bottom plate in multiple locations. Subsequent cleaning is cumbersome and prone to cross-contamination, further affecting the purity of the electronic-grade slurry. This technical solution, however, uses a four-roll mill arrangement, leveraging the spatial advantages of the ring structure to ensure that the lower areas of the upper three grinding rollers all have adjacent grinding rollers. This creates a natural and effective receiving mechanism. Even if a small amount of slurry adheres to and falls off from the lower part of the upper roller, it will fall directly onto the surface of the lower grinding roller and be reintroduced into the grinding channel to continue grinding. It will not drip meaninglessly onto the housing 1 and cause waste. Only the bottom three rollers 203 have the possibility of dripping downwards. This greatly reduces the three dripping risk points of the original three-roll mill to one, significantly reducing the overall probability of slurry dripping and waste. It effectively reduces the raw material loss of silver-copper co-fired slurry and also greatly reduces the slurry residue area inside the equipment housing 1, reducing the difficulty of cleaning the equipment and the risk of cross-contamination. This better meets the stringent requirements of electronic-grade silver-copper co-fired slurry grinding for raw material utilization and production process cleanliness.

[0038] Please see Figure 7 , Figure 8 and Figure 9 As shown, an adjustment component 3 is installed at the end of the grinding assembly 2. The adjustment component 3 is used to drive the four sets of grinding rollers to expand outward or contract inward synchronously, thereby synchronously adjusting the gap between each set of grinding rollers. The adjustment component 3 includes a connecting rod 301 rotatably connected inside the support roller 6. A set of umbrella-shaped drive gears 302 are respectively provided at both ends of the connecting rod 301, and the umbrella-shaped drive gears 302 are fixedly connected to the connecting rod 301. Four sets of umbrella-shaped transmission gears 303 are meshed on the outer wall of the umbrella-shaped drive gears 302, and the umbrella-shaped transmission gears 303 correspond one-to-one with the grinding rollers. A rotating rod 304 is fixedly connected to the end of the umbrella-shaped transmission gear 303, and a first limiting block 309 is rotatably connected to the outside of the rotating rod 304. 09 is fixedly connected to the housing 1, and the first limiting block 309 is used to support the rotating rod 304. The end of the rotating rod 304 away from the bevel transmission gear 303 is fixedly connected to the lead screw 305. The lead screw 305 is mounted on the outside of the ball nut 306. The ball nut 306 is fixedly connected to the outside of the push rod 307. The push rod 307 is slidably connected to the outside of the second limiting block 310. The second limiting block 310 is fixedly connected to the housing 1, and the second limiting block 310 is used to restrict the push rod 307 to slide only along its axial direction and not rotate. The end of the push rod 307 is fixedly connected to the bearing 308. The bearing 308 is sleeved on the end of the grinding roller, and the grinding roller is rotatably connected to the bearing 308.

[0039] The grinding rollers are not arranged in a uniform ring array outside the support roller 6. The larger the gap between the two grinding rollers, the larger the angle formed by the line connecting their center points to the center point of the support roller 6. When grinding is completed at the same gap level, and it is necessary to reduce the gap between the grinding rollers, simply rotate the connecting rod 301. Through the transmission of the umbrella-shaped drive gear 302 and umbrella-shaped transmission gear 303, as well as the movement conversion of the rotating rod 304, lead screw 305, ball nut 306, and push rod 307, the grinding rollers can be driven to move towards the support roller 6 simultaneously. Since the angles formed by the lines connecting the grinding rollers to the center line of the support roller 6 are different, they are used to construct different sizes of gaps between the rollers. Therefore, when the grinding rollers move inward synchronously along the line connecting their center points to the center of the support roller 6, and the amount of inward movement is the same, the gaps between the rollers still maintain their original size differences.

[0040] Existing three-roll mills for grinding silver-copper co-fired slurries require separate adjustments to the gaps between the three sets of grinding rollers, which are arranged in parallel. This necessitates separate adjustments to the gaps from the back to the middle and from the middle to the front, and each set requires independent fine-tuning at both ends of the roller. The overall adjustment process is cumbersome and time-consuming. Manual operation is prone to uneven gaps at both ends of the roller and deviations from the preset gap gradient between sets, affecting not only the uniformity of grinding but also potentially causing excessive shearing damage to the silver-clad copper core-shell structure or insufficient grinding due to gap errors. In contrast, this technical solution arranges four sets of grinding rollers in a circular pattern and includes an adjustment component 3. Simply rotating the connecting rod 301 drives all four sets of grinding rollers to move synchronously inward. The overall gap between the rollers has been reduced, and this adjustment method can accurately maintain the preset gap size difference between each group of rollers. There is no need to adjust the gap of each group and the two ends of the roller body separately, which greatly simplifies the operation process of gap adjustment and improves the gap adjustment efficiency. At the same time, it effectively avoids the gap deviation caused by manual step-by-step adjustment, ensures the uniformity of the axial gap of each roller body and the stability of the gap gradient between groups, and can accurately control the shear strength of different grinding stages. It is suitable for the gradient grinding requirements of silver-copper co-fired slurry from coarse dispersion to fine grinding, and can protect the silver-coated copper core-shell structure to the maximum extent, ensuring uniform slurry grinding fineness and consistent performance. It is more in line with the process requirements of rapid and precise gap adjustment in large-scale production.

[0041] Please see Figure 7 and Figure 10As shown, a discharge assembly 5 is installed on the side of the housing 1. The discharge assembly 5 is used to discharge the ground slurry outward. The discharge assembly 5 includes a discharge plate 501, and the top of the discharge plate 501 is slidably connected to the housing 1. The housing 1 has a discharge port at the position corresponding to the discharge plate 501. A sealing cover plate 502 is installed inside the discharge port, and the sealing cover plate 502 is rotatably connected to the housing 1. A slider 503 is fixedly connected to the back of the discharge plate 501. A slide groove 504 is slidably connected to the outside of the slider 503. A spring 505 is fixedly connected to the bottom of the slider 503, and the spring 505 is disposed inside the slide groove 504.

[0042] Working principle: The silver-copper co-fired slurry to be ground is stored inside the hopper 401. Then, the gear transmission structure 205 is activated, driving each set of grinding rollers to rotate. The small motor at the top of the opening and closing plate 403 and the rotating shaft can drive the opening and closing plate 403 to rotate upward, so that the discharge port is in the open state. At the same time, the bottom end of the opening and closing plate 403 contacts the roller surface of the first roller 201. At this time, the slurry inside the hopper 401 is fed into the gap between the first roller 201 and the second roller 202 through the discharge port. Since the first roller 201 and the second roller 202 rotate in opposite directions... Furthermore, due to the speed difference, the slurry located between roller 1 201 and roller 202 undergoes initial grinding under the shearing force, the squeezing action between the two rollers, and the kneading and tearing action of the slurry caused by the speed difference. Because roller 1 201 rotates faster, its shearing and traction force on the slurry in the gap is stronger. After the initial grinding, most of the slurry tends to move with roller 1 201. However, when it moves to the limiting scraper 7, it is blocked by the limiting scraper 7, and the slurry is trapped between the limiting scraper 7 and roller 202. Subsequently, under the rotation of roller 1 201, it is carried by roller 202 towards... The slurry undergoes a second grinding process in the gap between the second roller 202 and the third roller 203. Because the rotational speed of the third roller 203 is greater than that of the second roller 202, the slurry after the second grinding is carried by the third roller 203 to the gap between the third roller 203 and the fourth roller 204, where it undergoes a third grinding process. After the third grinding, the slurry then enters the gap between the fourth roller 204 and the first roller 201 for a fourth grinding process. The gap between each set of rollers gradually narrows, gradually increasing the grinding effect on the slurry. After one round of grinding, the slurry moves with the first roller 201 to the first roller 201. Between the opening and closing plate 403, the material will not enter the space between the first roller 201 and the second roller 202 temporarily due to the obstruction of the opening and closing plate 403. When the slurry above the opening and closing plate 403 gradually increases and the pressure it receives gradually increases to a certain threshold, the top motor drives the opening and closing plate 403 to rotate downward, so that the bottom end of the opening and closing plate 403 contacts the bottom end of the fixed plate 402. At this time, the discharge port is closed and the new slurry stops being fed. Then, after one cycle, the slurry can enter the space between the first roller 201 and the second roller 202 with the first roller 201 and enter the second grinding cycle.

[0043] After two to three rounds, the slurry can be discharged outward through the discharge assembly 5. During the cyclic grinding process, the discharge plate 501 is pulled outward, and its top is flush with the inner wall of the housing 1. The slider 503 is provided with a positioning bolt on its side to support and position the discharge plate 501. At this time, the sealing cover 502 is in the closed state. When the grinding is finished and the material needs to be discharged outward, the sealing cover 502 is rotated to open and the positioning bolt on the side of the slider 503 is pulled out. Under the elastic force of the spring 505, the slider 503 is pushed upward, so that the top of the discharge plate 501 contacts the roller surface of the three rollers 203, and then the slurry can be scraped outward.

[0044] After two to three rounds of cyclic grinding at the same gap level, it is necessary to further reduce the gaps of each group. The gaps between each group of rollers and the gaps at both ends of the grinding rollers can be adjusted synchronously by adjusting component 3. The specific operation method is as follows: rotate the handle at the end of the connecting rod 301, the connecting rod 301 drives the umbrella-shaped drive gears 302 at both ends of it to rotate, the umbrella-shaped drive gears 302 drive the four sets of umbrella-shaped transmission gears 303 that mesh with it to rotate, and then drive the rotating rod 304 to rotate. The push rod 307 cannot rotate with it due to the action of its external first limit block 309. The lead screw 305 and the ball nut 306 can convert the rotational motion into linear motion. Through the push rod 307 and the bearing 308, each group of grinding rollers is driven to move towards the middle position synchronously, thereby synchronously reducing the gaps between each group of rollers.

[0045] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A high reliability low sintering temperature silver copper co-fired paste grinding device, characterized in that, The device includes a housing, inside which a support roller is fixedly connected. A grinding assembly is arranged around the support roller. The grinding assembly includes four sets of grinding rollers surrounding the support roller. The four sets of grinding rollers are arranged clockwise from the topmost one as roller one, roller two, roller three, and roller four. A gear transmission structure is installed at one end of each grinding roller. The gear transmission structure is used to drive roller one, roller two, roller three, and roller four to rotate. The rotation directions of adjacent sets of grinding rollers are opposite. The speed ratio between roller two, roller three, roller four, and roller one is 1:2:4:8, and the gaps between roller one and roller two, roller two and roller three, roller three and roller four, and roller four and roller one decrease sequentially. An adjustment component is installed at the end of the grinding assembly. The adjustment component is used to drive the four sets of grinding rollers to expand outward or contract inward synchronously, thereby synchronously adjusting the gap between each set of grinding rollers. A feeding assembly is provided at the gap between the first roller and the second roller. The feeding assembly includes a hopper, the bottom of which is provided with a discharge port. The top of the discharge port is provided with an opening and closing plate, and the opening and closing plate is rotatably connected to the hopper. The adjustment assembly includes a connecting rod rotatably connected inside the support roller. Each end of the connecting rod is provided with a set of umbrella-shaped drive gears, and the umbrella-shaped drive gears are fixedly connected to the connecting rod. The outer wall of the umbrella-shaped drive gears is meshed with four sets of umbrella-shaped transmission gears, and the umbrella-shaped transmission gears correspond one-to-one with the grinding roller. The end of the bevel gear is fixedly connected to a rotating rod, and a first limiting block is rotatably connected to the outside of the rotating rod. The first limiting block is fixedly connected to the housing and is used to support the rotating rod. The end of the rotating rod away from the bevel gear is fixedly connected to a lead screw. A ball nut is installed on the outside of the lead screw. A push rod is fixedly connected to the outside of the ball nut. A second limiting block is slidably connected to the outside of the push rod. The second limiting block is fixedly connected to the housing and is used to restrict the push rod to slide only along its axial direction and not rotate.

2. The high reliability low sintering temperature silver copper co-fired paste grinding device according to claim 1, wherein: A limiting scraper is fixedly connected to the side of the support roller. The top of the limiting scraper is in contact with the surface of the roller and is used to scrape off the slurry adhering to the surface of the roller.

3. The high reliability low sintering temperature silver copper co-fired paste grinding device of claim 1, wherein: A fixing plate is provided at the bottom of the discharge port, and the fixing plate is fixedly connected to the hopper. Folding plates are fixedly connected to both ends of the fixing plate and the opening and closing plate.

4. The high-reliability, low-sintering-temperature silver-copper co-fired slurry grinding device according to claim 1, characterized in that: A pressure sensor is installed inside the opening and closing plate. When the opening and closing plate rotates upward to its maximum angle, the discharge port is in an open state, and the bottom end of the opening and closing plate is in contact with the surface of a roller to block the material on the surface of the roller. When the opening and closing plate rotates downward, the bottom end of the opening and closing plate is in contact with the bottom end of the fixed plate, and the discharge port is closed.

5. The high-reliability, low-sintering-temperature silver-copper co-fired slurry grinding device according to claim 1, characterized in that: The end of the push rod is fixedly connected to a bearing, which is sleeved on the end of the grinding roller, and the grinding roller and the bearing are rotatably connected.

6. The high-reliability, low-sintering-temperature silver-copper co-fired slurry grinding device according to claim 1, characterized in that: A discharge assembly is installed on the side of the housing. The discharge assembly includes a discharge plate, and the top of the discharge plate is slidably connected to the housing. A discharge port is opened on the housing at the position corresponding to the discharge plate. A sealing cover is installed inside the discharge port, and the sealing cover is rotatably connected to the housing.

7. The high reliability low sintering temperature silver copper co-fired paste grinding device of claim 6, wherein: A slider is fixedly connected to the back of the discharge plate, a slide groove is slidably connected to the outside of the slider, and a spring is fixedly connected to the bottom of the slider, with the spring located inside the slide groove.

Images