Nano silver powder preparation device

Abstract

The invention relates to the technical field of metal powder manufacturing devices, in particular to a nano silver powder preparation device which comprises a mounting frame, a three-dimensional moving mechanism, a cutting mechanism, a clamping mechanism, a flushing mechanism, a collecting barrel, a cooling mechanism and a multi-stage settling separation mechanism. The three-dimensional moving mechanism, the clamping mechanism, the flushing mechanism, the cooling mechanism, the collecting barrel and the multi-stage settling separation mechanism are all arranged on the mounting frame, the cutting mechanism is connected with the output end of the three-dimensional moving mechanism, and the collecting barrel is communicated with the multi-stage settling separation mechanism. The cutting mechanism is used for cutting silver ingots to obtain silver powder water, only part of the silver ingots can be cut, the number of the silver ingots needing to be cut can be flexibly controlled, then the silver powder water is separated through the multi-stage settling separation mechanism, nanometer silver powder water is obtained, the overall structure of the device is simple, and the preparation cost of nanometer silver powder can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of metal powder manufacturing devices, and more specifically, to a nano silver powder preparation device. Background Art

[0002] Nano-sintered silver has become an important component of chip welding materials due to its excellent "low-temperature sintering and high-temperature service" characteristics. The preparation of nanosilver and its application in the semiconductor field have become a hot topic of research in recent years. In order to meet the growing demand, researchers are committed to developing various methods to prepare high-quality nanosilver particles. The preparation methods of nanosilver mainly include three categories: physical, chemical and biological. Chemical methods, such as chemical reduction, electrochemical deposition and chemical vapor deposition, can control the particle size and morphology by adjusting the reaction conditions, but often require the use of toxic or corrosive chemical reagents, which may cause harm to the environment and operators. Biological methods use organisms or biomolecules as reducing agents and stabilizers to synthesize nanosilver, such as using plant extracts, microorganisms and enzymes. This method is relatively environmentally friendly, but the efficiency and yield of the preparation process need to be improved, and the control of reaction conditions is relatively complicated.

[0003] At present, in order to reduce environmental pollution, physical methods are used to prepare nanosilver. Physical methods usually utilize technologies such as mechanical grinding, laser evaporation or physical vapor deposition. These technologies can control the particle size and morphology of nanosilver, but have high equipment requirements and high energy consumption, resulting in high costs. Summary of the invention

[0004] The purpose of the present invention is to overcome the disadvantage of high cost of the prior art and provide a nano silver powder preparation device which can reduce the preparation cost of the nano silver powder.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] Provided is a nano silver powder preparation device, comprising a mounting frame, a three-dimensional moving mechanism, a cutting mechanism, a clamping mechanism, a flushing mechanism for flushing the cutting mechanism, a collecting bucket for collecting silver powder, a cooling mechanism for cooling silver powder water in the collecting bucket, and a multi-stage sedimentation separation mechanism, wherein the three-dimensional moving mechanism, the clamping mechanism, the flushing mechanism, the cooling mechanism, the collecting bucket, and the multi-stage sedimentation separation mechanism are all arranged on the mounting frame, the cutting mechanism is connected to the output end of the three-dimensional moving mechanism, and the collecting bucket is communicated with the multi-stage sedimentation separation mechanism.

[0007] The nano silver powder preparation device of the present invention clamps the silver ingot in a clamping mechanism when preparing the nano silver powder, starts a three-dimensional moving mechanism to drive the cutting mechanism to move in a three-dimensional space, starts the cutting mechanism to cut the surface of the silver ingot, and while cutting, a flushing mechanism flushes and cools the cutting mechanism, flushes the cut silver powder into a collecting bucket for collection, and a cooling mechanism cools the silver powder water in the collecting bucket to reduce the agglomeration of the silver powder due to the thermal effect, and is not easy to agglomerate the silver powder in the silver powder water, and can keep the silver powder in the silver powder water in a dispersed state, which is convenient for subsequent separation of the nano silver powder, wherein the nano silver powder is suspended in the water and floats on the water surface, and the silver powder larger than the nano silver powder is deposited at the bottom of the collecting bucket, and the silver powder water in the collecting bucket enters a multi-stage sedimentation separation mechanism for separation, and only nano silver powder water is obtained, and finally the nano silver powder water is centrifuged to obtain the nano silver powder. The device uses a cutting mechanism to cut silver ingots to obtain silver powder water, and can cut only part of the silver ingot, flexibly controlling the amount of silver ingot to be cut, and then separates the silver powder water through a multi-stage sedimentation separation mechanism to obtain nano silver powder water. The overall structure of the device is simple, and the preparation cost of nano silver powder can be reduced.

[0008] Furthermore, the flushing mechanism includes an inert gas foaming machine, a protective cover and a water spray pipe for flushing the cutting mechanism, the inert gas foaming machine is arranged on the mounting frame, the inert gas foaming machine is connected to the water spray pipe, the protective cover is connected to the three-dimensional moving mechanism, and the cutting mechanism is located in the protective cover. The protective cover is provided to prevent the water spray pipe from splashing the silver powder, and the inert gas foaming machine is provided to add inert gas to the flushing water, which can reduce the agglomeration of the silver powder due to the electrostatic effect and prevent the silver powder from being oxidized by oxygen in the air.

[0009] Furthermore, the cooling mechanism includes a heat exchange tank, a spiral tube and a refrigerator, the heat exchange tank and the refrigerator are both arranged on the mounting frame, the spiral tube is arranged in the heat exchange tank, both ends of the spiral tube are connected to the collection bucket, the heat exchange tank has a coolant, and both ends of the refrigerator are connected to the heat exchange tank. By setting up a refrigerator, the coolant is used to perform heat exchange on the silver powder water through the outer wall of the spiral tube, so that the temperature of the silver powder water is reduced, the agglomeration of the silver powder due to the thermal effect is reduced, and the silver powder in the silver powder water is not easy to agglomerate, and the silver powder in the silver powder water can be kept in a dispersed state, which is convenient for the subsequent separation of nano silver powder.

[0010] Furthermore, the collecting barrel is connected to the inert gas foaming machine; or the cooling mechanism further includes a cooling barrel, which is arranged in the heat exchange tank and is connected to the inert gas foaming machine. By flushing the cutting mechanism with the cooled water in the collecting barrel or the cooling barrel, the cutting part can be cooled to avoid oxidation of the silver powder due to the high temperature generated by cutting.

[0011] Furthermore, the multi-stage sedimentation separation mechanism includes a plurality of sedimentation barrels, a first collecting tank and a second valve. The plurality of sedimentation barrels and the first collecting tank are all arranged on the mounting frame. The plurality of sedimentation barrels are all provided with a liquid inlet and a liquid outlet. The plurality of sedimentation barrels are all provided with a first valve at the liquid outlet. The plurality of sedimentation barrels are all provided with a discharge port at the bottom. The plurality of sedimentation barrels are all provided with a first valve at the discharge port. The liquid outlet of the sedimentation barrel of the previous stage is connected with the liquid inlet of the sedimentation barrel of the next stage. The collecting barrel is connected with the sedimentation barrel of the first stage. The first collecting tank is connected with the sedimentation barrel of the last stage. The first valve is closed, and the silver powder water is sequentially sedimented and separated through the plurality of sedimentation barrels. The nano-level silver powder is always suspended in the water and floats on the water surface. After the multi-stage sedimentation is completed, the first valve of the sedimentation barrel of the last stage is opened to flow the nano silver powder water into the first collecting tank for collection. The structure is simple and the cost is low.

[0012] Furthermore, it also includes a second collecting tank and a third valve, the second collecting tank is arranged on the mounting frame, the discharge port is connected with the second collecting tank, the bottom of the collecting barrel is arranged obliquely, the lowest end of the collecting barrel is provided with a discharge port, and the third valve is arranged on the collecting barrel and is located at the discharge port. By arranging the second collecting tank and the second valve, the silver powder settled in the settling barrel can be collected, and by arranging the third valve, the silver powder settled at the bottom of the collecting barrel can be collected, thereby obtaining silver powders of different diameters to meet different production needs.

[0013] Furthermore, the clamping mechanism includes a vacuum adsorption plate and a vacuum generator, both of which are arranged on the mounting frame, the vacuum adsorption plate has an adsorption cavity, an adsorption hole, and a groove for placing the silver ingot, the vacuum generator is connected to the adsorption cavity, and the adsorption cavity is connected to the groove through the adsorption hole. When clamping the silver ingot, the silver ingot is placed in the groove, the adsorption cavity is evacuated by the vacuum generator, and the adsorption cavity adsorbs the silver ingot in the groove through the adsorption hole, so as to fix and clamp the silver ingot.

[0014] Furthermore, the cutting mechanism includes a rotating motor, a rotating shaft and a slicing knife, wherein the rotating motor is connected to the output end of the three-dimensional moving mechanism, the rotating shaft is connected to the output end of the rotating motor, and the slicing knife is coaxially connected to the rotating shaft on the circumference of the rotating shaft. The rotating motor is started to drive the rotating shaft to rotate, which drives the slicing knife to rotate and cut the silver ingot.

[0015] Furthermore, it also includes a sliding mechanism for moving the clamping mechanism toward the cutting mechanism, the sliding mechanism includes a linear guide, a mobile motor, a lead screw and a slide seat, the linear guide and the mobile motor are both arranged on the mounting frame, the lead screw is rotatably arranged on the mounting frame and connected to the output end of the mobile motor, the slide seat is slidably arranged on the linear guide and is threadedly connected to the lead screw, and the clamping mechanism is arranged on the slide seat. By setting the sliding mechanism, when clamping the silver ingot, the sliding mechanism is activated to keep the clamping mechanism away from the dicing knife, so that the uncut silver ingot can be installed in the clamping mechanism, and the dicing knife can be prevented from causing damage to the human hand during installation.

[0016] Furthermore, it also includes a water shield, the clamping mechanism and the cutting mechanism are both located in the water shield, the water shield includes a movable plate, a blocking plate, a U-shaped waterproof plate and a flexible waterproof tube, the movable plate is arranged on the cutting mechanism, the blocking plate is arranged on the clamping mechanism, the U-shaped waterproof plate and the flexible waterproof tube are both arranged on the collection bucket, one side of the U-shaped waterproof plate is connected to one end of the flexible waterproof tube, the movable plate is connected to the other end of the flexible waterproof tube, and the other side of the U-shaped waterproof plate is in airtight contact with the blocking plate. By setting up the water shield, splashing water stains can be blocked, and the cut silver powder can be collected in the collection bucket. By setting up the flexible waterproof tube, it is convenient for the three-dimensional moving mechanism to drive the dicing knife to move.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. A nano silver powder preparation device of the present invention uses a cutting mechanism to cut silver ingots to obtain silver powder water, can cut only part of the silver ingot, flexibly control the amount of silver ingots to be cut, and then separate the silver powder water through a multi-stage sedimentation separation mechanism to obtain nano silver powder water. The overall structure of the device is simple and can reduce the preparation cost of nano silver powder.

[0019] 2. A nano silver powder preparation device of the present invention is provided with a refrigerator, and uses a coolant to perform heat exchange on the silver powder water through the outer wall of the spiral tube, so that the temperature of the silver powder water is reduced, and the agglomeration of the silver powder due to the thermal effect is reduced, and the silver powder in the silver powder water is not easy to agglomerate. The silver powder in the silver powder water can be kept in a dispersed state, which is convenient for the subsequent separation of the nano silver powder.

[0020] 3. A nano silver powder preparation device of the present invention uses cooled water in a collection barrel or a cooling barrel to flush the cutting mechanism, thereby cooling the cutting part to avoid oxidation of the silver powder due to the high temperature generated by cutting; at the same time, by setting an inert gas foaming machine and adding inert gas to the flushing water, the agglomeration of the silver powder due to the electrostatic effect can be reduced, and the oxygen in the air can be prevented from oxidizing the silver powder.

[0021] 4. A nano silver powder preparation device of the present invention can collect the silver powder settled in the sedimentation barrel by setting a second collecting tank and a second valve, and can collect the silver powder settled at the bottom of the collecting barrel by setting a third valve, thereby obtaining silver powder of different diameters to meet different production needs.

[0022] 5. A nano silver powder preparation device of the present invention evacuates the adsorption chamber into a vacuum through a vacuum generator, and the adsorption chamber adsorbs the silver ingot into the groove through the adsorption hole to fix and clamp the silver ingot. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a nano silver powder preparation device;

[0024] Figure 2 It is a structural schematic diagram of a flushing mechanism in a nano silver powder preparation device;

[0025] Figure 3 It is a structural schematic diagram of a multi-stage sedimentation separation mechanism in a nano silver powder preparation device;

[0026] Figure 4 It is a schematic diagram of the structure of a water retaining cover in a nano silver powder preparation device;

[0027] Figure 5 yes Figure 4 A magnified view of the structure at center A;

[0028] Figure 6 It is a schematic diagram of the structure of the three-dimensional moving mechanism in the nano silver powder preparation device;

[0029] Figure 7 It is a structural schematic diagram of a sliding mechanism in a nano silver powder preparation device;

[0030] Figure 8 This is an electron microscope image of the silver powder cut by the dicing knife in Example 3;

[0031] Fig. 9 yes Figure 8 Structure diagram of silver powder at the mid-micron level;

[0032] Fig.10 yes Figure 8 Structure diagram of silver powder at medium and nanometer level;

[0033] Fig.11 This is an electron microscope image of the silver powder cut by a higher mesh number dicing knife in Example 3;

[0034] Fig.12 This is the analysis diagram of silver powder in Experiment 1 of Example 2;

[0035] Fig.13 This is the analysis diagram of silver powder in Experiment 2 of Example 2;

[0036] Fig.14 This is the analysis diagram of silver powder in Experiment 3 in Example 2;

[0037] Fig.15 This is a graph of silver powder content in Experiment 1 of Example 2;

[0038] Fig.16 This is a graph of silver powder content in Experiment 2 of Example 2;

[0039] Fig.17 This is a graph of the silver powder content in Experiment 3 in Example 2.

[0040] In the attached drawings: 1. mounting frame; 2. three-dimensional moving mechanism; 201. X-axis moving mechanism; 202. Y-axis moving mechanism; 203. Z-axis moving mechanism; 204. moving support frame; 205. bearing support seat; 3. cutting mechanism; 301. rotating motor; 302. rotating shaft; 303. dicing knife; 4. clamping mechanism; 401. vacuum adsorption plate; 411. adsorption chamber; 412. adsorption hole; 413. groove; 402. vacuum generator; 403. sealing ring; 5. flushing mechanism; 501. inert gas foaming machine; 502. water spray pipe; 503. protective cover; 531. cutting port; 532. drain port; 504. foaming pipe; 505. foaming water pump; 506. flushing pipe; 507. shunt pipe; 6. cooling mechanism; 601. heat exchange tank; 602. spiral Pipe; 603, refrigerator; 604, heat exchange water pump; 605, cooling pipe; 606, reflux pipe; 607, cooling water pump; 7, collecting barrel; 701, collecting frame; 711, discharge port; 702, collecting box; 703, connecting pipe; 8, multi-stage sedimentation separation mechanism; 801, sedimentation barrel; 811, discharge port; 802, first valve; 803, first collecting tank; 804, second valve; 805, water inlet pipe; 806, water inlet pump; 807, overflow pipe; 808, mounting rod; 9, second collecting tank; 10, third valve; 11, sliding mechanism; 111, linear guide rail; 112, moving motor; 113, lead screw; 114, slide seat; 12, water shield; 121, movable plate; 122, blocking plate; 123, U-shaped waterproof plate; 124, flexible waterproof pipe. DETAILED DESCRIPTION

[0041] The present invention is further described below in conjunction with specific implementation methods. The accompanying drawings are only used for exemplary descriptions and are only schematic diagrams, not actual drawings, and cannot be understood as limiting this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0042] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0043] Embodiment 1

[0044] This embodiment is the first embodiment of a device for preparing nano silver powder. Figure 1 As shown, it includes a mounting frame 1, a three-dimensional moving mechanism 2, a cutting mechanism 3, a clamping mechanism 4, a flushing mechanism 5 for flushing the cutting mechanism 3, a collecting bucket 7 for collecting silver powder, a cooling mechanism 6 for cooling the silver powder water in the collecting bucket 7, and a multi-stage sedimentation separation mechanism 8. The three-dimensional moving mechanism 2, the clamping mechanism 4, the flushing mechanism 5, the cooling mechanism 6, the collecting bucket 7 and the multi-stage sedimentation separation mechanism 8 are all arranged on the mounting frame 1, the cutting mechanism 3 is connected to the output end of the three-dimensional moving mechanism 2, the clamping mechanism 4 and the cutting mechanism 3 are respectively located on the opposite sides of the collecting bucket 7, the clamping mechanism 4 and the cutting mechanism 3 are both located above the collecting bucket 7, and the collecting bucket 7 is connected to the multi-stage sedimentation separation mechanism 8.

[0045] The working principle of the nano silver powder preparation device of this embodiment is as follows:

[0046] When preparing nano silver powder, the silver ingot is clamped in the clamping mechanism 4, the three-dimensional moving mechanism 2 is started to drive the cutting mechanism 3 to move in the three-dimensional space, and the cutting mechanism 3 is started to cut the surface of the silver ingot. While cutting, the flushing mechanism 5 flushes and cools the cutting mechanism 3, and the cut silver powder is flushed into the collecting bucket 7 for collection. The cooling mechanism 6 cools the silver powder water in the collecting bucket 7 to reduce the agglomeration of the silver powder due to the thermal effect, and is not easy to agglomerate the silver powder in the silver powder water. The silver powder in the silver powder water can be kept in a dispersed state, which is convenient for the subsequent separation of nano silver powder. The nano silver powder is suspended in the water and floats on the water surface, and the silver powder larger than the nano silver level is deposited at the bottom of the collecting bucket 7. The silver powder water in the collecting bucket 7 enters the multi-stage sedimentation separation mechanism 8 for separation, and only nano silver powder water is obtained. Finally, the nano silver powder water is centrifuged to obtain nano silver powder. The device uses a cutting mechanism 3 to cut silver ingots to obtain silver powder water, and can only cut part of the silver ingot, flexibly controlling the amount of silver ingots to be cut, and then separates the silver powder water through a multi-stage sedimentation separation mechanism 8 to obtain nano silver powder water. The overall structure of the device is simple, and the preparation cost of nano silver powder can be reduced.

[0047] Embodiment 2

[0048] This embodiment proposes a nano silver powder preparation device. Based on the first embodiment, in this embodiment, Figure 2 As shown, the collecting barrel 7 includes a collecting frame 701, a collecting box 702 and a connecting pipe 703. The collecting frame 701 and the collecting box 702 are both arranged on the mounting frame 1. The top of the collecting frame 701 is open to collect the silver powder after cutting. The cutting mechanism 3 and the clamping mechanism 4 are both located above the collecting frame 701. One end of the connecting pipe 703 is connected to the bottom of the collecting frame 701, and the other end is connected to the middle of the collecting box 702. The collecting box 702 is connected to the multi-stage sedimentation separation mechanism 8.

[0049] like Figure 2 As shown, the flushing mechanism 5 includes an inert gas foaming machine 501, a protective cover 503, a foaming pipe 504, a foaming water pump 505, a flushing pipe 506, a shunt pipe 507 and a water spray pipe 502 for flushing the cutting mechanism 3. The inert gas foaming machine 501 is arranged on the mounting frame 1, the input end of the inert gas foaming machine 501 is connected to the foaming pipe 504, the foaming water pump 505 is installed and connected to the foaming pipe 504, the two ends of the flushing pipe 506 are respectively connected to the output end of the inert gas foaming machine 501 and the shunt pipe 507, and the water spray pipe 502 is arranged on the shunt pipe 507 and is connected to the shunt pipe 507. By setting the inert gas foaming machine 501 and adding inert gas to the flushing water, the agglomeration of silver powder due to the electrostatic effect can be reduced, and the oxygen in the air can be prevented from oxidizing the silver powder.

[0050] The cooling mechanism 6 includes a heat exchange tank 601, a spiral tube 602, a refrigerator 603, a heat exchange water pump 604, a cooling tube 605, a return tube 606 and a cooling water pump 607. The heat exchange tank 601 and the refrigerator 603 are both arranged on the mounting frame 1. The spiral tube 602 is arranged in the heat exchange tank 601. Both ends of the spiral tube 602 are connected to the collection box 702. The heat exchange water pump 604 is installed and connected to the spiral tube 602. In this embodiment, the heat exchange water pump 604 is preferably arranged at the bottom end of the spiral tube 602. The heat exchange tank 601 There is cooling liquid inside, both ends of the refrigerator 603 are connected to the heat exchange tank 601, and both ends of the cooling pipe 605 and the return pipe 606 are connected to the heat exchange tank 601 and the refrigerator 603 respectively. In this embodiment, the cooling pipe 605 is preferably located above the return pipe 606, that is, the cooling pipe 605 is connected to the top of the heat exchange tank 601, and the return pipe 606 is connected to the bottom of the heat exchange tank 601, which can better cool the silver powder water in the spiral tube 602, and the cooling water pump 607 is installed and connected to the return pipe 606. By setting the refrigerator 603, the cooling liquid is used to heat exchange the silver powder water through the outer wall of the spiral tube 602, so that the temperature of the silver powder water is reduced, the agglomeration of the silver powder due to the thermal effect is reduced, and the silver powder in the silver powder water is not easy to agglomerate, and the silver powder in the silver powder water can be kept in a dispersed state, which is convenient for the subsequent separation of nano silver powder.

[0051] The collection box 702 is connected to the inert gas foaming machine 501; or, the cooling mechanism 6 further includes a cooling barrel, which is arranged in the heat exchange tank 601 and is connected to the inert gas foaming machine 501. By flushing the cutting mechanism with the cooled water in the collection barrel 7 or the cooling barrel, the cutting part can be cooled to avoid oxidation of the silver powder due to the high temperature generated by cutting.

[0052] After the silver powder water is collected in the collection frame 701, the silver powder water in the collection frame 701 flows to the collection box 702 through the connecting pipe 703, and the silver powder water in the collection box 702 is extracted by the heat exchange water pump 604. The silver powder water enters through the bottom end of the spiral tube 602 and then flows out from the top. At the same time, the refrigeration water pump 607 extracts the coolant in the heat exchange tank 601 through the reflux pipe 606, and the coolant enters the refrigerator 603. The refrigerator 603 cools the coolant. The cooled coolant flows into the heat exchange tank 601 from the cooling pipe 605. The coolant in the heat exchange tank 601 exchanges heat with the silver powder water through the tube wall of the spiral tube 602. By setting the collection frame 701 and the collection box 702, the silver powder water in the collection box 702 is cooled, and the cooling effect is better. The foaming water pump 505 draws out the cold water in the collection box 702 or the cooling barrel through the foaming tube 504. When the foaming water pump 505 is connected to the collection box 702, it is preferably connected to the top of the collection box 702, so that the water in the foaming tube 504 contains as few silver particles as possible, and the silver particles are also smaller to prevent the foaming water pump 505 from being blocked. The cold water enters the inert gas foaming machine 501, and the inert gas foaming machine 501 injects inert gas into the cold water. In this embodiment, the inert gas is preferably carbon dioxide, and the inert gas foaming machine 501 used is a carbon dioxide foaming machine. Carbon dioxide has better water solubility and can The carbon dioxide in the silver ingot can be dissolved in water to form acid radicals. The cold water containing carbon dioxide flows to the shunt pipe 507 through the flushing pipe 506. The cold water in the shunt pipe 507 is sprayed to the cutting mechanism 3 through the water spraying pipe 502, so as to cool the cutting mechanism 3 and the cutting part of the silver ingot by the cutting mechanism 3. At the same time, the carbon dioxide in the cold water can reduce the agglomeration of the powder due to the electrostatic effect. The cold water that has flushed the cutting mechanism 3 and the silver ingot flows into the collecting frame 701 for collection, because the addition of cold water and carbon dioxide can greatly reduce the agglomeration of silver powder due to the electrostatic effect, and also prevent the oxidation of the silver powder caused by the high temperature generated by the cutting and the oxygen in the air.

[0053] In this embodiment, three groups of experiments are conducted on the flushing mechanism 5 .

[0054] Experiment 1: When the silver powder water in the collection box 702 is cooled and carbon dioxide is injected into the water sprayed toward the dicing knife 303, the silver powder water in the collection box 702 is sprayed toward the dicing knife 303. The cooled silver powder water can timely cool down the dicing knife 303 and the cut part of the silver ingot, and the cooling water injected with carbon dioxide further reduces the probability of silver powder being oxidized. Carbon dioxide, as an inert gas, can solve the agglomeration of silver powder caused by electrostatic effect on the one hand, and isolate oxygen in the air on the other hand, making it difficult for silver powder to come into contact with oxygen. Fig.12 and Fig.15 As shown, there is no oxygen content, and a purer silver powder is obtained.

[0055] Experiment 2: When the silver powder water in the collection box 702 is not cooled and carbon dioxide is not injected into the water sprayed toward the dicing blade 303, the silver powder water in the collection box 702 is directly sprayed toward the dicing blade. Because the silver powder is oxidized by contact with oxygen in the air under high temperature, Fig.13 and Fig.16 As shown, it can be seen that it contains a higher level of oxygen.

[0056] Experiment 3: The silver powder water in the collection box 702 is cooled, but carbon dioxide is not injected into the water sprayed toward the dicing knife 303. The silver powder water in the collection box 702 is sprayed toward the dicing knife 303. The cooled silver powder water can cool down the dicing knife 303 and the cut part of the silver ingot in time, so that the probability of silver powder being oxidized is significantly reduced. Fig.14 and Fig.17 As shown, Fig.17 The oxygen content in Fig.16 Significantly reduced.

[0057] The protective cover 503 is connected to the three-dimensional moving mechanism 2, and the cutting mechanism 3 is located inside the protective cover 503. The protective cover 503 is provided to prevent the water spray pipe 502 from splashing silver powder. Figure 5 As shown, the protective cover 503 is provided with a cutting opening 531 for the blade of the cutting mechanism 3 to extend out, the bottom of the protective cover 503 is provided with a drain port 532 for water to flow down, and the diverter pipe 507 is provided on the protective cover 503. When the cutting mechanism 3 cuts the silver ingot, the water flow and the silver powder are thrown out together. By providing the protective cover 503, the inner wall of the protective cover 503 blocks the silver powder and the water flow, so that the silver powder and water flow from the inner wall of the protective cover 503 to the bottom of the protective cover 503, and the silver powder and water flow from the drain port 532 to the collection frame 701.

[0058] like Figure 3As shown, the multi-stage sedimentation separation mechanism 8 includes a plurality of sedimentation barrels 801, a first valve 802, a first collection tank 803, a second valve 804, a water inlet pipe 805, a water inlet pump 806, an overflow pipe 807 and a mounting rod 808. The plurality of sedimentation barrels 801 are sequentially installed and connected to the mounting rod 808 from top to bottom. The plurality of sedimentation barrels 801 perform multi-stage sedimentation on the silver powder water. The first collection tank 803 is arranged on the mounting frame 1. The plurality of sedimentation barrels 801 are sequentially connected to the collection box 70. 2 is connected with the first-stage sedimentation barrel 801 through the water inlet pipe 805, the water inlet pump 806 is installed and connected to the water inlet pipe 805, the middle part of the first collection tank 803 is connected with the last-stage sedimentation barrel 801 through the overflow pipe 807, the first valve 802 is arranged at the liquid outlet of the sedimentation barrel 801, that is, the first valve 802 is installed and connected to the overflow pipe 807, the bottom of the sedimentation barrel 801 is provided with a discharge port 811, and the second valve 804 is arranged on the sedimentation barrel 801 and is located at the discharge port 811. The first valve 802 is closed, and the silver powder water is sequentially sedimented and separated through multiple sedimentation barrels 801, and the nano-level silver powder is always suspended in the water and floats on the water surface. After the multi-stage sedimentation is completed, the first valve 802 of the last-stage sedimentation barrel 801 is opened to flow the nano silver powder water into the first collection tank 803 for collection, which has a simple structure and low cost.

[0059] It also includes a second collecting tank 9 and a third valve 10. The second collecting tank 9 is arranged on the mounting frame 1. The discharge port 811 is connected to the second collecting tank 9. The bottom of the collecting frame 701 is inclined. The lowest end of the collecting frame 701 is provided with a discharge port 711. The third valve 10 is arranged on the collecting frame 701 and is located at the discharge port 711. By arranging the second collecting tank 9 and the second valve 804, the silver powder settled in the settling barrel 801 can be collected. By arranging the third valve 10, the silver powder settled at the bottom of the collecting frame 701 can be collected, thereby obtaining silver powders of different diameters to meet different production needs.

[0060] In this embodiment, there are four sedimentation barrels 801, namely, a first-level sedimentation barrel, a second-level sedimentation barrel, a third-level sedimentation barrel and a fourth-level sedimentation barrel. The first valve 802 uses an electromagnetic valve. The first-level sedimentation barrel, the second-level sedimentation barrel, the third-level sedimentation barrel and the fourth-level sedimentation barrel are evenly installed on the circumference of the mounting plate and connected to the circumference of the mounting rod 808. The top surface of the second-level sedimentation barrel is lower than the bottom surface of the first-level sedimentation barrel, the top surface of the third-level sedimentation barrel is lower than the bottom surface of the second-level sedimentation barrel, and the top surface of the fourth-level sedimentation barrel is lower than the bottom surface of the third-level sedimentation barrel, so as to facilitate the silver powder water in the upper-level sedimentation barrel to flow into the next-level sedimentation barrel. When the silver powder water in the collection barrel needs to be separated, all the first valves 802 cut off all the overflow pipes 807, and the water inlet pump 806 pumps the silver powder water in the collection box 702 into the primary settling barrel. After the silver powder water in the primary settling barrel settles for a period of time, some large particles of silver powder settle to the bottom of the primary settling barrel, and the solenoid valve between the primary settling barrel and the secondary settling barrel is opened to allow the silver powder water in the primary settling barrel to flow to the secondary settling barrel; when the silver powder water level in the primary settling barrel drops to the overflow pipe, the solenoid valve between the primary settling barrel and the secondary settling barrel is closed, and the water inlet pump 806 pumps the silver powder water in the collection barrel into the primary settling barrel through the water inlet pipe 805. After the silver powder water in the secondary settling barrel settles for a period of time, some large particles of silver powder settle to the bottom of the secondary settling barrel, and the solenoid valve between the secondary settling barrel and the tertiary settling barrel is opened to allow the silver powder water in the secondary settling barrel to flow to the tertiary settling barrel; when the silver powder water level in the secondary settling barrel drops to the secondary overflow pipe, the solenoid valve is closed, and the solenoid valve between the primary settling barrel and the secondary settling barrel is opened to allow the silver powder water in the primary settling barrel to enter the secondary settling barrel. After the silver powder water in the tertiary settling barrel settles for a period of time, some large particles of silver powder settle to the bottom of the tertiary settling barrel, and the solenoid valve between the third and fourth settling barrels is opened to allow the silver powder water in the third settling barrel to flow to the fourth settling barrel; when the silver powder water level in the tertiary settling barrel drops to the overflow pipe, the solenoid valve between the third and fourth settling barrels is closed, and the solenoid valve between the second and third settling barrels is opened to allow the silver powder water in the secondary settling barrel to enter the tertiary settling barrel. After the silver powder water in the fourth-level sedimentation barrel settles for a period of time, some large-particle silver powder settles to the bottom of the fourth-level sedimentation barrel. The solenoid valve between the fourth-level sedimentation barrel and the first collection tank 803 is opened to discharge the target product, nano silver powder water; when the silver powder water level in the fourth-level sedimentation barrel drops to the overflow pipe, the solenoid valve between the fourth-level sedimentation barrel and the first collection tank 803 is closed, and then the solenoid valve between the third-level sedimentation barrel and the fourth-level sedimentation barrel is opened to allow the silver powder water in the third-level sedimentation barrel to enter the third-level sedimentation barrel. The multi-stage sedimentation barrel performs multi-stage sedimentation on the silver powder water, so that silver powder water with a high content of nano silver powder is finally obtained, and finally nano silver powder is obtained by centrifugation. After the preparation is completed, the second valve 804 and the third valve 10 are opened, and the silver powder water in the four sedimentation barrels enters the four second collection tanks 9 for collection.The circumference of the drain pipe is connected to the bottom of the collection frame 701, one end of the drain pipe is closed, the bottom of the collection frame 701 gradually tilts toward the drain pipe from top to bottom, and the third valve 10 is installed and connected to the other end of the drain pipe. After the cut silver powder enters the collection frame 701, part of it settles to the bottom of the collection frame 701 due to the larger particle size, and the silver powder at the bottom of the collection frame 701 flows to the drain pipe in the water. When it is necessary to collect the silver powder settled in the collection frame 701, open the third valve 10, so that the water flow drives the silver powder to flow out, and then the collected silver powder is centrifuged. By setting the drain pipe and the third valve 10, the silver powder settled at the bottom of the collection frame 701 can be collected. Silver powders of five particle sizes can be used for the production of different products.

[0061] Embodiment 3

[0062] This embodiment proposes a nano silver powder preparation device, based on the first or second embodiment, in this embodiment, as Figure 6 As shown, the three-dimensional moving mechanism 2 includes a moving support frame 204, an X-axis moving mechanism 201, a Y-axis moving mechanism 202 and a Z-axis moving mechanism 203. The moving support frame 204 is arranged on the mounting frame 1, the X-axis moving mechanism 201 is arranged on the moving support frame 204, the Y-axis moving mechanism 202 is connected to the output end of the X-axis moving mechanism 201, the Z-axis moving mechanism 203 is connected to the output end of the Y-axis moving mechanism 202, and the cutting mechanism 3 is connected to the output end of the Z-axis moving mechanism 203. The X-axis moving mechanism 201 is relative to the left and right direction of the silver ingot, including an X-axis linear motor and an X-axis moving plate connected to the output end of the X-axis linear motor. The Y-axis moving mechanism 202 is relative to the front and back direction of the silver ingot, that is, the thickness direction, including a Y-axis linear motor arranged on the X-axis moving plate and a Y-axis moving plate connected to the output end of the Y-axis linear motor. The Z-axis moving mechanism 203 is relative to the up and down direction of the silver ingot, that is, the height direction, including a Z-axis linear motor arranged on the Y-axis moving plate and a Z-axis moving plate connected to the output end of the Z-axis linear motor. The Z-axis moving plate is parallel to the vacuum adsorption plate 401. The rotating motor 301 is arranged on the top surface of the Z-axis moving plate. A bearing support seat 205 is arranged on the side of the Z-axis moving plate. The rotating shaft 302 is rotatably arranged on the bearing support seat 205. The rotating motor 301 drives the rotating shaft 302 to rotate through a synchronous pulley. The above-mentioned linear motor is a common linear motor on the market. The specific structure is that the motor drives the ball screw to rotate, driving the linear slide threadedly connected to the ball screw to move linearly along a linear guide parallel to the ball screw.

[0063] like Figure 2As shown, the cutting mechanism 3 includes a rotating motor 301, a rotating shaft 302 and a dicing knife 303. The rotating motor 301 is connected to the output end of the three-dimensional moving mechanism 2, and the rotating shaft 302 is connected to the output end of the rotating motor 301. The dicing knife 303 is coaxially connected to the rotating shaft 302 on the circumference of the rotating shaft 302. The blade of the dicing knife 303 is electroplated with diamonds, and the mesh number of the diamond needs to be greater than 600 meshes. The rotation speed of the dicing knife 303 reaches more than 10,000 revolutions per minute, and the blade width is 2μm. In this embodiment, the circumference of the shunt pipe 507 is connected to a plurality of water spray pipes 502, and a plurality of dicing knives 303 are evenly distributed along the axis direction of the rotating shaft 302, and the nozzle of each water spray pipe 502 faces a dicing knife 303. The rotating motor 301 is started to drive the rotating shaft 302 to rotate, which drives the dicing knife 303 to rotate and cut the silver ingot.

[0064] When the silver ingot needs to be cut, the Y-axis linear motor drives the Y-axis moving plate to approach the silver ingot, so that the slicing knife 303 contacts the silver ingot, and the slicing knife 303 cuts the silver ingot; the Z-axis linear motor drives the Z-axis moving plate to rise and fall along the surface of the silver ingot, and the slicing knife 303 cuts the silver ingot from top to bottom or from bottom to top; the X-axis linear motor drives the X-axis moving plate to move, and the X-axis moving plate drives the slicing knife 303 to move horizontally, so that the slicing knife 303 is aligned with the uncut part of the silver ingot, and the Y-axis linear motor and the Z-axis linear motor drive the slicing knife 303 to cut the silver ingot again.

[0065] After cutting the silver ingot using a diamond dicing knife 303 with a mesh size of 600, Figures 8 to 10 As shown in the figure, the cut silver powder contains both micron-level and nano-level silver powder. Fig.11 When a dicing knife with a higher diamond mesh is used, the proportion of nano silver powder cut off will be higher.

[0066] like Figure 4 and Figure 5As shown, the clamping mechanism 4 includes a vacuum adsorption plate 401, a vacuum generator 402 and a sealing ring 403. The vacuum adsorption plate 401 and the vacuum generator 402 are both arranged on the mounting frame 1. The vacuum adsorption plate 401 has an adsorption cavity 411, an adsorption hole 412 and a groove 413 for placing the silver ingot. The groove 413 is located on the side of the vacuum adsorption plate 401 facing the slicing knife 303. The vacuum generator 402 is connected with the adsorption cavity 411, and the adsorption cavity 411 is connected with the groove 413 through the adsorption hole 412. The sealing ring 403 is arranged on the vacuum adsorption plate 401 and is located in the groove 413. The adsorption hole 412 is located on the inner side of the sealing ring 403. When clamping the silver ingot, the silver ingot is placed in the groove 413, and the adsorption chamber 411 is evacuated by the vacuum generator 402. The adsorption chamber 411 adsorbs the silver ingot in the groove 413 through the adsorption hole 412 and presses it against the sealing ring 403. When cutting the silver ingot, the force applied is toward the groove 413, which further presses the sealing ring 403 and fixes the silver ingot tighter.

[0067] like Figure 5 As shown, in this embodiment, the vacuum adsorption plate 401 is tilted, and the vacuum adsorption plate 401 gradually tilts downward from the groove 413 to the adsorption chamber 411, so that the notch direction of the groove 413 is tilted upward. When the silver ingot is placed in the groove 413, the silver ingot automatically slides to the bottom of the groove 413 under the action of its own gravity, and the silver ingot is pressed against the sealing ring 403 by its own weight, without applying external force to press the silver ingot. The top of the mobile support frame 204 is tilted, so that the Z-axis moving mechanism 203 is parallel to the vacuum adsorption plate 401, and the Z-axis linear motor can always drive the Z-axis moving plate to move along the height direction of the vacuum adsorption plate 401, that is, along the height direction of the silver ingot. It should be noted that for those skilled in the art, the verticality at this place can be adjusted to 89°, 91°, etc., which should be within the protection scope of the present invention as long as the Z-axis moving plate can move along the height direction of the silver ingot.

[0068] like Figure 1 As shown, it also includes a sliding mechanism 11 for moving the clamping mechanism 4 toward the cutting mechanism 3, as shown in FIG. Figure 7As shown, the sliding mechanism 11 includes a linear guide 111, a moving motor 112, a lead screw 113 and a slide 114. The linear guide 111 and the moving motor 112 are both arranged on the mounting frame 1. The lead screw 113 is rotatably arranged on the mounting frame 1 and connected to the output end of the moving motor 112. The slide 114 is slidably arranged on the linear guide 111 and is threadedly connected to the lead screw 113. The clamping mechanism 4 is arranged on the slide 114. By setting the sliding mechanism 11, the sliding mechanism 11 is started when clamping the silver ingot, that is, the moving motor 112 is started to drive the lead screw 113 to rotate, drive the slide 114 to move on the linear guide 111, drive the clamping mechanism 4 to move, and keep the clamping mechanism 4 away from the dicing knife 303, so as to facilitate the installation of the uncut silver ingot in the clamping mechanism 4 and avoid the dicing knife 303 from causing damage to the human hand during installation.

[0069] like Figure 7 As shown, it also includes a water shield 12, and the clamping mechanism 4 and the cutting mechanism 3 are both located in the water shield 12. Figure 4 As shown, the water shield 12 includes a movable plate 121, a sealing plate 122, a U-shaped waterproof plate 123 and a flexible waterproof tube 124. The movable plate 121 is arranged on the cutting mechanism 3, and the movable plate 121 is installed and connected to the peripheral side of the Z-axis movable plate. The flushing pipe 506 passes through the movable plate 121 and is fixedly connected to the movable plate 121. The sealing plate 122 is arranged on the clamping mechanism 4. The sliding seat 114, the sealing plate 122 and the vacuum adsorption plate 401 are connected in sequence. The U-shaped waterproof plate 123 and the flexible waterproof tube 124 are both arranged on the collecting frame 701, and both ends of the U-shaped waterproof plate 123 are connected to the collecting frame 701, one side of the U-shaped waterproof plate 123 is connected to one end of the flexible waterproof tube 124, the movable plate 121 is connected to the other end of the flexible waterproof tube 124, and the other side of the U-shaped waterproof plate 123 is sealed against the sealing plate 122. When the vacuum adsorption plate 401 moves away from the collection frame 701, the slide 114 drives the blocking plate 122 to move away from the collection frame 701; when the vacuum adsorption plate 401 returns to the collection frame 701, the slide 114 drives the blocking plate 122 to fit the side of the U-shaped waterproof plate 123; when the Z-axis moving plate moves, the Z-axis moving plate drives the movable plate 121 to move, and the movable plate 121 can move through the flexible waterproof tube 124. By setting the water shield 12, splashing water stains can be blocked, so that the cut silver powder can be collected in the collection frame 701.

[0070] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A nano silver powder preparation device, characterized in that: The invention comprises a mounting frame (1), a three-dimensional moving mechanism (2), a cutting mechanism (3), a clamping mechanism (4), a flushing mechanism (5) for flushing the cutting mechanism (3), a collecting bucket (7) for collecting silver powder, a cooling mechanism (6) for cooling the silver powder water in the collecting bucket (7), and a multi-stage sedimentation separation mechanism (8); the three-dimensional moving mechanism (2), the clamping mechanism (4), the flushing mechanism (5), the cooling mechanism (6), the collecting bucket (7), and the multi-stage sedimentation separation mechanism (8) are all arranged on the mounting frame (1); the cutting mechanism (3) is connected to the output end of the three-dimensional moving mechanism (2); and the collecting bucket (7) is connected to the multi-stage sedimentation separation mechanism (8).

2. The nano silver powder preparation device according to claim 1, characterized in that: The flushing mechanism (5) comprises an inert gas foaming machine (501), a protective cover (503) and a water spray pipe (502) for flushing the cutting mechanism (3); the inert gas foaming machine (501) is arranged on the mounting frame (1); the inert gas foaming machine (501) and the water spray pipe (502) are connected; the protective cover (503) is connected to the three-dimensional moving mechanism (2); and the cutting mechanism (3) is located inside the protective cover (503).

3. The nano silver powder preparation device according to claim 2, characterized in that: The cooling mechanism (6) comprises a heat exchange tank (601), a spiral tube (602) and a refrigerator (603); the heat exchange tank (601) and the refrigerator (603) are both arranged on the mounting frame (1); the spiral tube (602) is arranged in the heat exchange tank (601); both ends of the spiral tube (602) are connected to the collecting bucket (7); the heat exchange tank (601) contains cooling liquid; and both ends of the refrigerator (603) are connected to the heat exchange tank (601).

4. The nano silver powder preparation device according to claim 3, characterized in that: The collecting barrel (7) is in communication with the inert gas foaming machine (501); Alternatively, the cooling mechanism (6) further comprises a cooling barrel, wherein the cooling barrel is disposed in the heat exchange tank (601), and the cooling barrel is connected to the inert gas foaming machine (501).

5. The nano silver powder preparation device according to claim 1, characterized in that: The multi-stage sedimentation separation mechanism (8) comprises a plurality of sedimentation barrels (801), a first collecting tank (803) and a second valve (804); the plurality of sedimentation barrels (801) and the first collecting tank (803) are all arranged on the mounting frame (1); the plurality of sedimentation barrels (801) are all provided with a liquid inlet and a liquid outlet; the liquid outlets of the plurality of sedimentation barrels (801) are all provided with a first valve (802); the bottoms of the plurality of sedimentation barrels (801) are all provided with a discharge port (811); the discharge port (811) of the plurality of sedimentation barrels (801) is all provided with a first valve (802); the liquid outlet of the sedimentation barrel (801) of the previous stage is connected to the liquid inlet of the sedimentation barrel (801) of the next stage; the collecting tank (7) is connected to the sedimentation barrel (801) of the first stage; and the first collecting tank (803) is connected to the sedimentation barrel (801) of the last stage.

6. The nano silver powder preparation device according to claim 5, characterized in that: It also comprises a second collecting tank (9) and a third valve (10), wherein the second collecting tank (9) is arranged on the mounting frame (1), the discharge port (811) is connected to the second collecting tank (9), the bottom of the collecting barrel (7) is arranged obliquely, the lowest end of the collecting barrel (7) is provided with a discharge port (711), and the third valve (10) is arranged on the collecting barrel (7) and is located at the discharge port (711).

7. The nano silver powder preparation device according to any one of claims 1 to 6, characterized in that: The clamping mechanism (4) comprises a vacuum adsorption plate (401) and a vacuum generator (402); the vacuum adsorption plate (401) and the vacuum generator (402) are both arranged on the mounting frame (1); the vacuum adsorption plate (401) has an adsorption cavity (411), adsorption holes (412) and a groove (413) for placing silver ingots; the vacuum generator (402) is connected to the adsorption cavity (411); and the adsorption cavity (411) is connected to the groove (413) through the adsorption holes (412).

8. The nano silver powder preparation device according to any one of claims 1 to 6, characterized in that: The cutting mechanism (3) comprises a rotating motor (301), a rotating shaft (302) and a slicing knife (303); the rotating motor (301) is connected to the output end of the three-dimensional moving mechanism (2); the rotating shaft (302) is connected to the output end of the rotating motor (301); and the slicing knife (303) is coaxially connected to the rotating shaft (302) on the circumference of the rotating shaft (302).

9. The nano silver powder preparation device according to any one of claims 1 to 6, characterized in that: The invention also comprises a sliding mechanism (11) for moving the clamping mechanism (4) toward the cutting mechanism (3); the sliding mechanism (11) comprises a linear guide rail (111), a movable motor (112), a lead screw (113) and a slide seat (114); the linear guide rail (111) and the movable motor (112) are both arranged on the mounting frame (1); the lead screw (113) is rotatably arranged on the mounting frame (1) and is connected to the output end of the movable motor (112); the slide seat (114) is slidably arranged on the linear guide rail (111) and is threadedly connected to the lead screw (113); and the clamping mechanism (4) is arranged on the slide seat (114).

10. The nano silver powder preparation device according to any one of claims 1 to 6, characterized in that: The invention also comprises a water shield (12), wherein the clamping mechanism (4) and the cutting mechanism (3) are both located in the water shield (12), and the water shield (12) comprises a movable plate (121), a sealing plate (122), a U-shaped waterproof plate (123) and a flexible waterproof tube (124), wherein the movable plate (121) is arranged on the cutting mechanism (3), the sealing plate (122) is arranged on the clamping mechanism (4), the U-shaped waterproof plate (123) and the flexible waterproof tube (124) are both arranged on the collecting barrel (7), one side of the U-shaped waterproof plate (123) is connected to one end of the flexible waterproof tube (124), the movable plate (121) is connected to the other end of the flexible waterproof tube (124), and the other side of the U-shaped waterproof plate (123) is in sealed contact with the sealing plate (122).

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