Oxalic acid silver powder feeding device and silver oxalate solution preparation equipment

Abstract

The utility model relates to the technical field of oxalic acid silver powder feeding, in particular to an oxalic acid silver powder feeding device and silver oxalate solution preparation equipment. The oxalic acid silver powder feeding device comprises a stock bin, the stock bin comprises a flow guide part, the inner diameter of the flow guide part is gradually reduced from top to bottom, the bottom of the flow guide part is provided with a discharging port allowing oxalic acid silver powder to flow outwards at the preset unit time flow, and a first electromagnetic valve is arranged at the discharging port; the spraying device comprises a spraying mechanism and a purified water supply mechanism, the spraying mechanism is located in the flow guide part, and the purified water supply mechanism is located outside the stock bin and communicates with the spraying mechanism; and the control device is in signal connection with the first electromagnetic valve and the purified water supply mechanism so as to control the operation of the two. According to the oxalic acid silver powder feeding device, the oxalic acid silver powder can be automatically fed into the reaction kettle at the preset unit time flow, workers do not need to make contact with the oxalic acid silver powder for a long time, and therefore the body health of the workers is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of silver oxalate powder feeding, in particular to a silver oxalate powder feeding device and silver oxalate solution preparation equipment. Background Art

[0002] Silver oxalate solution is a key chemical raw material in the production of ethylene oxide catalysts. Silver oxalate solution can be prepared by fully dissolving silver oxalate powder in pure water. However, the dissolution process generates significant heat. Therefore, adding a large amount of silver oxalate powder to the pure water in a reactor at once can cause an explosion due to the instantaneous exotherm.

[0003] To prevent explosions, silver oxalate powder is typically added to the reactor manually. Specifically, a worker first wets the silver oxalate powder in its packaging, also moistening the container it holds. The worker then slowly fills the container with a predetermined amount of silver oxalate powder, and then slowly adds the powder from the container to the reactor. This process is repeated until the target amount of silver oxalate powder is reached.

[0004] However, although the manual slow addition method can prevent explosions, silver oxalate powder is toxic and long-term exposure to silver oxalate powder will endanger the health of workers. Utility Model Content

[0005] The utility model aims to overcome the problem in the prior art that long-term manual addition of silver oxalate powder may harm the health of workers.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a silver oxalate powder feeding device on the one hand, which comprises: a silo, the silo comprises a closing part and a flow guide part which are sealed and connected to each other, the flow guide part is located below the closing part, the inner diameter of the flow guide part gradually decreases from top to bottom, the bottom of the flow guide part is provided with a discharge port which allows the silver oxalate powder to flow outward at a preset unit time flow rate, a first solenoid valve is provided at the discharge port, and the closing part is provided with a first feed port connected to the flow guide part; a spraying device, the spraying device comprises a spraying mechanism and a pure water supply mechanism, the spraying mechanism is located in the flow guide part and can spray pure water to the silver oxalate powder in the flow guide part and the peripheral wall of the flow guide part, the pure water supply mechanism is located outside the silo, and the pure water supply mechanism is connected to the spraying mechanism to deliver pure water to the spraying mechanism; and a control device, the control device signal is connected to the first solenoid valve and the pure water supply mechanism so as to be able to control the operation of the two.

[0007] In some embodiments, the spraying mechanism includes a first nozzle connected to the pure water providing mechanism, the first nozzle is fixedly connected to the guide portion, the first nozzle is arranged in a ring shape, and the axis of the first nozzle coincides with the axis of the guide portion, and a plurality of first spray holes are provided at intervals at the bottom of the first nozzle, and the aperture of the first spray hole is smaller than the particle size of the silver oxalate crystal particles of the silver oxalate powder.

[0008] In some embodiments, the axis of the first spray hole is perpendicular to the peripheral wall of the guide portion.

[0009] In some embodiments, the spraying mechanism also includes a second nozzle connected to the pure water providing mechanism, the second nozzle is fixedly connected to the guide portion, and the second nozzle is located above the first nozzle, the top of the second nozzle is set to be hemispherical, and the top of the second nozzle is spaced apart by a plurality of second spray holes and a plurality of third spray holes, and the aperture of the second spray hole and the aperture of the third spray hole are smaller than the particle size of the silver oxalate crystal particles of the silver oxalate powder.

[0010] In some embodiments, the second spray hole faces the closed portion, and the aperture of the second spray hole gradually decreases from bottom to top; the third spray hole faces the peripheral wall of the flow guide portion, and the position of the third spray hole is lower than that of the second spray hole.

[0011] In some embodiments, the pure water providing mechanism includes a pure water storage tank, which is located outside the silo. The pure water storage tank is connected to the first nozzle and the second nozzle through a delivery pipeline. The delivery pipeline is provided with a second solenoid valve and a delivery pump located outside the silo. The second solenoid valve and the delivery pump are respectively connected to the control device signal.

[0012] In some embodiments, the closing portion includes a cylindrical sealing peripheral plate and a circular sealing top plate, the bottom of the sealing peripheral plate is sealed to the top of the guide portion, the sealing top plate is sealed to the top of the sealing peripheral plate, and the sealing top plate is provided with a first feed port.

[0013] In some embodiments, the silver oxalate powder feeding device further includes an exhaust pipeline, which is installed on the top surface of the sealing top plate and communicates with the interior of the silo. The exhaust pipeline is provided with an air pressure valve and a dust collector.

[0014] In some embodiments, the diameter of the discharge port ranges from 40 mm to 60 mm.

[0015] The utility model also provides a silver oxalate solution preparation device, which includes a reactor and the above-mentioned silver oxalate powder feeding device, a second feed port is provided on the top of the reactor, the silver oxalate powder feeding device is located above the second feed port, and the discharge port of the guide part is connected to the second feed port through a first solenoid valve.

[0016] The above technical solution of the utility model has the following beneficial effects:

[0017] Silver oxalate powder is added to the silo through the first feed port. A control device controls the purified water supply mechanism to deliver purified water to the spray mechanism, which then sprays purified water onto the silver oxalate powder and the surrounding walls of the diversion portion, keeping the silver oxalate powder moist. The control device controls the opening of the first solenoid valve, allowing the silver oxalate powder to move along the diversion portion toward the discharge port. The purified water sprayed from the spray mechanism also drives the silver oxalate powder along the diversion portion toward the discharge port, allowing the silver oxalate powder to smoothly pass through the discharge port and enter the reactor. Furthermore, because the discharge port is configured to allow the silver oxalate powder to flow outward at a preset flow rate per unit time, the silver oxalate powder can be slowly added to the reactor at an appropriate flow rate per unit time, avoiding the exothermic release caused by excessive addition. Therefore, the silver oxalate powder feeding device of the present invention can automatically add silver oxalate powder to the reactor at a preset flow rate per unit time, eliminating the need for workers to be exposed to the silver oxalate powder for extended periods of time, thereby protecting their health. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of a silver oxalate powder feeding device in one embodiment of the present invention;

[0019] Figure 2 It is a schematic diagram of the first nozzle in one embodiment of the present utility model;

[0020] Figure 3 yes Figure 2 Schematic diagram of a cross section taken along line L;

[0021] Figure 4 It is a cross-sectional schematic diagram of the second nozzle in one embodiment of the present utility model;

[0022] Figure 5 It is a schematic diagram of a silver oxalate solution preparation device in one embodiment of the present invention.

[0023] Description of Reference Numerals

[0024] 1. Silo; 11. Closing part; 111. First feed port; 112. Exhaust pipe; 113. Air pressure valve; 114. Dust collector; 12. Flow guide; 121. Discharge port; 122. First solenoid valve; 2. Spraying device; 21. Spraying mechanism; 211. First nozzle; 2111. First spray hole; 212. Second nozzle; 2121. Second spray hole; 2122. Third spray hole; 22. Pure water supply mechanism; 221. Pure water storage tank; 222. Delivery pipeline; 223. Second solenoid valve; 224. Delivery pump; 3. Control device; 4. Reactor. DETAILED DESCRIPTION

[0025] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and not to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.

[0026] like Figure 1 As shown, the present invention provides a silver oxalate powder feeding device. The silver oxalate powder feeding device includes a silo 1, a spraying device 2, and a control device 3. The silo 1 includes a sealing portion 11 and a flow guide portion 12, which are sealed and connected to each other. The flow guide portion 12 is located below the sealing portion 11. The inner diameter of the flow guide portion 12 gradually decreases from top to bottom. The bottom of the flow guide portion 12 is provided with a discharge port 121 that allows the silver oxalate powder to flow outward at a preset unit time flow rate. A first solenoid valve 122 is provided at the discharge port 121. The sealing portion 11 is provided with a first feed port 111 that is connected to the flow guide portion 12. The spraying device 2 includes a spraying mechanism 21 and a pure water supply mechanism 22. The spraying mechanism 21 is located in the guide portion 12 and is capable of spraying pure water onto the silver oxalate powder in the guide portion 12 and the surrounding wall of the guide portion 12. The pure water supply mechanism 22 is located outside the silo 1 and is connected to the spraying mechanism 21 to supply pure water to the spraying mechanism 21. The control device 3 is signal-connected to the first solenoid valve 122 and the pure water supply mechanism 22 to control the operation of both.

[0027] Specifically, the interior of the silo 1 has a cavity capable of accommodating silver oxalate powder. The first solenoid valve 122 is located outside the discharge port 121 and is connected to the discharge port 121. The control device 3 can control the opening and closing of the first solenoid valve 122, thereby realizing the opening and closing of the discharge port 121. Of course, the control device 3 can also control the opening degree of the first solenoid valve 122. In addition, the control device 3 can control the opening and closing of the pure water supply mechanism 22. The control device 3 can also adjust the amount of pure water provided by the pure water supply mechanism 22 per unit time, so that the pure water supply mechanism 22 provides pure water to the spray mechanism 21 at a preset flow rate.

[0028] In this embodiment, silver oxalate powder is added to the silo 1 through the first feed port 111. The control device 3 controls the pure water supply mechanism 22 to deliver pure water to the spray mechanism 21. The spray mechanism 21 sprays pure water onto the silver oxalate powder and the surrounding wall of the flow guide 12, thereby keeping the silver oxalate powder moist. The control device 3 controls the first solenoid valve 122 to open, allowing the silver oxalate powder to move along the flow guide 12 toward the discharge port 121. The pure water sprayed from the spray mechanism 21 also drives the silver oxalate powder along the flow guide 12 toward the discharge port 121, allowing the silver oxalate powder to smoothly pass through the discharge port 121 and enter the reactor 4. Moreover, because the discharge port 121 is configured to allow the silver oxalate powder to flow outward at a preset flow rate per unit time, the silver oxalate powder can be slowly added to the reactor 4 at an appropriate flow rate per unit time, avoiding excessive heat release due to excessive addition. Therefore, the silver oxalate powder feeding device of the present invention can automatically add silver oxalate powder to the reactor 4 at a preset unit time flow rate, eliminating the need for workers to be exposed to the silver oxalate powder for a long time, thereby protecting the health of employees.

[0029] In addition, it should be noted that silver oxalate powder is dangerous and may explode when subjected to severe impact or friction. Therefore, the silver oxalate powder and the container containing the silver oxalate powder must be moistened, and the flow of the silver oxalate powder or the addition of the silver oxalate powder must be controlled or added in a relatively gentle and slow manner to reduce friction and impact. Therefore, when manually adding the silver oxalate powder, it is necessary to do so slowly, which results in high labor intensity for the staff and also causes the manual addition time to be too long, thereby reducing production efficiency. The silver oxalate powder feeding device of the present invention can automatically add the silver oxalate powder to the reactor 4 at a preset unit time flow rate, that is, the wet silver oxalate powder can be gradually added to the reactor 4 in a slow manner, thereby effectively preventing the silver oxalate powder from being subjected to severe friction and severe impact, and reducing the labor intensity of the staff, effectively shortening the feeding time, and improving production efficiency.

[0030] In some embodiments, an outwardly extending discharge pipe is provided at the discharge port 121, and a first solenoid valve 122 is mounted on the discharge pipe. In some embodiments, during the addition of silver oxalate powder, the weight of purified water required for spraying is 1-2 times the weight of the total silver oxalate powder in the silo 1. In some embodiments, the spray mechanism 21 is located at a height of 1 / 5-1 / 4 of the height of the silo 1.

[0031] like Figures 1 to 3As shown, in some embodiments of the present invention, the spray mechanism 21 includes a first spray head 211 that is connected to the pure water supply mechanism 22. The first spray head 211 is fixedly connected to the guide portion 12. The first spray head 211 is arranged in an annular shape, and the axis of the first spray head 211 coincides with the axis of the guide portion 12. A plurality of first spray holes 2111 are spaced apart at the bottom of the first spray head 211. The aperture of the first spray hole 2111 is smaller than the particle size of the silver oxalate crystal particles of the silver oxalate powder to prevent the silver oxalate crystal particles from entering the first spray head 211 and causing blockage.

[0032] Specifically, the first nozzle 211 is configured in a ring shape, so the hollow portion in the middle of the first nozzle 211 becomes a channel for the silver oxalate powder to flow downward, which helps prevent the first nozzle 211 from clogging the guide portion 12. Moreover, the outer periphery of the first nozzle 211 is spaced apart from the peripheral wall of the guide portion 12, so that the silver oxalate powder can flow along the peripheral wall of the guide portion 12 toward the discharge port 121. All first spray holes 2111 are evenly distributed at the bottom of the first nozzle 211. The first spray holes 2111 extend downwardly and toward the peripheral wall of the guide portion 12, so that the first nozzle 211 can spray water evenly on the peripheral wall of the guide portion 12. Those skilled in the art can set the number of first spray holes 2111 and the spacing between adjacent first spray holes 2111 according to production requirements.

[0033] In this embodiment, the first nozzle 211 can evenly spray water onto the peripheral wall of the flow guide portion 12 at a preset unit time flow rate. The sprayed pure water can keep the silver oxalate powder moist, reduce the friction between the silver oxalate powder and the peripheral wall of the flow guide portion 12, and also drive the silver oxalate powder to slowly flow out of the discharge port 121.

[0034] In some embodiments, as Figure 2 As shown, the shape of the first nozzle 211 is similar to that of a tire inner tube. The interior of the first nozzle 211 has an annular cavity, the pure water supply mechanism 22 is connected to the cavity, and the first spray hole 2111 is connected to the cavity. Figure 3 As shown, in the axial direction of the first nozzle 211 , the cross section of the first nozzle 211 is annular.

[0035] In some embodiments of the present invention, the axis of the first spray hole 2111 is perpendicular to the peripheral wall of the flow guide portion 12 .

[0036] Specifically, the first spray holes 2111 extend perpendicularly to the peripheral wall of the flow guide 12, so the purified water sprayed from the first spray holes 2111 can flow in a direction perpendicular to the peripheral wall of the flow guide 12. This arrangement allows the purified water sprayed from the first spray holes 2111 to wet more silver oxalate powder and simultaneously drive more silver oxalate powder to move smoothly toward the discharge port 121.

[0037] In some embodiments, the angle between the peripheral wall of the guide portion 12 and the axis of the guide portion 12 is 40 degrees to 50 degrees, for example, 45 degrees.

[0038] like Figure 1 and Figure 4 As shown, in some embodiments of the present invention, the spraying mechanism 21 also includes a second nozzle 212 connected to the pure water providing mechanism 22, the second nozzle 212 is fixedly connected to the guide portion 12, and the second nozzle 212 is located above the first nozzle 211, the top of the second nozzle 212 is set to be hemispherical, and the top of the second nozzle 212 is spaced apart by a plurality of second spray holes 2121 and a plurality of third spray holes 2122, and the aperture of the second spray hole 2121 and the aperture of the third spray hole 2122 are smaller than the particle size of the silver oxalate crystal particles of the silver oxalate powder.

[0039] Specifically, during the process of the silver oxalate powder flowing toward the discharge port 121, the silver oxalate powder may form a bridge, causing the silver oxalate powder to be blocked in the flow guide 12. The second spray hole 2121 and the third spray hole 2122 of the second nozzle 212 can spray water upward, impacting the bridge of the powder, thereby breaking the bridge and ensuring that the silver oxalate powder flows smoothly toward the discharge port 121. In addition, since the top of the second nozzle 212 is configured as a hemispherical shape, the top surface of the second nozzle 212 is a hemispherical surface, and the silver oxalate powder will move along the top surface of the second nozzle 212 without being blocked by the top surface of the second nozzle 212.

[0040] In some embodiments, the outer diameter of the second nozzle 212 is smaller than the inner diameter of the first nozzle 211 , and the axis of the first nozzle 211 coincides with the axis of the second nozzle 212 .

[0041] In some embodiments, as Figure 4 As shown, the second nozzle 212 includes a hemispherical top wall, cylindrical side walls, and a circular bottom wall. The top wall is sealed to the top of the side walls, and the bottom wall is sealed to the bottom of the side walls. The second nozzle 212 has a cavity therein, and the purified water supply mechanism 22 is connected to the cavity. The second spray hole 2121 and the third spray hole 2122 are also connected to the cavity.

[0042] like Figure 1 As shown, in some embodiments of the present invention, the second spray hole 2121 faces the closed portion 11, and the aperture of the second spray hole 2121 gradually decreases from bottom to top; the third spray hole 2122 faces the peripheral wall of the flow guide portion 12, and the position of the third spray hole 2122 is lower than that of the second spray hole 2121.

[0043] Specifically, the second spray hole 2121 can spray water toward the closed portion 11. Because the aperture of the second spray hole 2121 gradually decreases from bottom to top, the flow rate of the pure water sprayed from the second spray hole 2121 increases. On the one hand, it can impact the powder bridge (the impact force is limited and will not cause an explosion), thereby effectively breaking the arch. On the other hand, it can also flush the silver oxalate powder near the second spray hole 2121, preventing silver oxalate crystal particles from entering the second spray hole 2121. In addition, the third spray hole 2122 is inclined upward and faces the upper portion of the peripheral wall of the flow guide portion 12. On the one hand, the pure water sprayed from the third spray hole 2122 can impact the powder bridge, effectively breaking the arch. On the other hand, the pure water sprayed from the third spray hole 2122 can also wet the peripheral wall of the flow guide portion 12, reducing friction between the silver oxalate powder and the flow guide portion 12.

[0044] like Figure 1 As shown, in some embodiments of the present invention, the pure water providing mechanism 22 includes a pure water storage tank 221, which is located outside the silo 1. The pure water storage tank 221 is connected to the first nozzle 211 and the second nozzle 212 through a delivery pipe 222. The delivery pipe 222 is provided with a second solenoid valve 223 and a delivery pump 224 located outside the silo 1. The second solenoid valve 223 and the delivery pump 224 are respectively connected to the control device 3 by signal.

[0045] Specifically, the pure water storage tank 221 delivers pure water to the first nozzle 211 and the second nozzle 212 through the delivery pipeline 222. The control device 3 can control the operation of the second solenoid valve 223, thereby controlling the flow rate of the delivery pipeline 222. For example, the control device 3 can control the opening and closing of the second solenoid valve 223, and can also control the opening degree of the second solenoid valve 223. The control device 3 can control the operation of the delivery pump 224, thereby controlling the flow rate of the delivery pipeline 222. For example, the control device 3 can control the opening and closing of the delivery pump 224, and can also control the pumping volume per unit time of the delivery pump 224. Controlling the flow rate of the delivery pipeline 222 can control the water spraying volume per unit time of the spraying mechanism 21.

[0046] In some embodiments, a manual stop valve that can be manually opened and closed may be further provided on the delivery pipeline 222 , and the manual stop valve may be used when the second solenoid valve 223 fails.

[0047] like Figure 1 As shown, in some embodiments of the present invention, the closing portion 11 includes a cylindrical sealing peripheral plate and a circular sealing top plate, the bottom of the sealing peripheral plate is sealed to the top of the guide portion 12, the sealing top plate is sealed to the top of the sealing peripheral plate, and the sealing top plate is provided with a first feed port 111.

[0048] Specifically, the flow guide part 12 is in the shape of a tapered cylinder, and the diameter of the flow guide part 12 gradually decreases from top to bottom. The sealing peripheral plate of the sealing part 11 is in the shape of a cylinder, the inner diameter of the sealing peripheral plate is the same as the maximum inner diameter of the flow guide part 12, and the axis of the flow guide part 12 coincides with the axis of the sealing peripheral plate. The bottom of the sealing peripheral plate is sealingly connected to the top of the flow guide part 12. The sealing top plate is sealingly connected to the top of the sealing peripheral plate, and a cover plate can be installed on the sealing top plate. The cover plate is rotatably installed on the sealing top plate, and the cover plate can rotate between a sealing position capable of sealing the first feeding port 111 and an opening position capable of opening the first feeding port 111. The first feeding port 111 is in communication with the inside of the silo 1, and of course the first feeding port 111 is also in communication with the inside of the flow guide part 12. The staff can add silver oxalate powder to the inside of the silo 1 through the first feeding port 111.

[0049] It should be noted that the staff slowly adds silver oxalate powder to the silo 1 through a special feeding device to prevent the silver oxalate powder from producing violent impact and violent friction. However, the flow of the special feeding device is large, and it cannot be used to add silver oxalate powder to the reaction kettle 4, otherwise an explosion will occur due to the large amount of addition.

[0050] As shown in Figure 1 some embodiments of the present application, the silver oxalate powder feeding device further comprises an exhaust pipeline 112, which is installed on the top surface of the sealing top plate and is in communication with the inside of the silo 1. The exhaust pipeline 112 is provided with a gas pressure valve 113 and a dust collector 114.

[0051] Specifically, the gas pressure valve 113 can balance the internal pressure of the silo 1 with the external pressure, which helps the silver oxalate powder to flow smoothly to the discharge port 121. Moreover, the dust collector 114 can block dust to prevent the silver oxalate dust from flowing out to the outside through the exhaust pipeline 112 and the gas pressure valve 113. The gas pressure valve 113 and the dust collector 114 are both common instruments in the field, and the structure and principle of the present application will not be described again.

[0052] In some embodiments of the present application, the diameter of the discharge port 121 ranges from 40mm to 60mm.

[0053] Specifically, the diameter of the discharge port 121 is set within the above range, so that the silver oxalate powder can flow out of the discharge port 121 at a preset unit time flow rate, preventing the addition speed of the silver oxalate powder from being too fast or too slow. Preferably, the diameter of the discharge port 121 is 50mm.

[0054] As shown in Figure 5As shown, the utility model also provides a silver oxalate solution preparation device, which includes a reactor 4 and the above-mentioned silver oxalate powder feeding device, a second feed port is provided on the top of the reactor 4, the silver oxalate powder feeding device is located above the second feed port, and the discharge port 121 of the guide part 12 is connected to the second feed port through a first solenoid valve 122.

[0055] Specifically, the silver oxalate solution preparation apparatus employs the aforementioned silver oxalate powder feeding device, thereby also achieving the aforementioned technical effects. Therefore, the silver oxalate powder feeding device can feed the silver oxalate powder into the reactor 4 at a preset flow rate per unit time, thereby preventing explosions in the reactor 4 caused by excessive addition.

[0056] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above are only preferred implementation methods of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principles of the present invention, they can make several improvements, modifications or changes, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the present invention to other occasions without improvement, should be regarded as the scope of protection of the present invention.

Claims

1. A silver oxalate powder feeding device, characterized in that: include: A silo (1), the silo (1) comprising a sealing portion (11) and a flow guide portion (12) that are in sealed communication with each other, the flow guide portion (12) being located below the sealing portion (11), the inner diameter of the flow guide portion (12) gradually decreasing from top to bottom, a discharge port (121) allowing silver oxalate powder to flow outward at a preset unit time flow rate being provided at the bottom of the flow guide portion (12), a first solenoid valve (122) being provided at the discharge port (121), and a first feed port (111) being in communication with the flow guide portion (12); A spraying device (2), the spraying device (2) comprising a spraying mechanism (21) and a pure water supply mechanism (22), the spraying mechanism (21) being located in the flow guide portion (12) and capable of spraying pure water onto the silver oxalate powder in the flow guide portion (12) and the peripheral wall of the flow guide portion (12), the pure water supply mechanism (22) being located outside the silo (1), the pure water supply mechanism (22) being in communication with the spraying mechanism (21) to deliver pure water to the spraying mechanism (21); as well as A control device (3) is connected to the first solenoid valve (122) and the pure water supply mechanism (22) via signals so as to be able to control the operation of the two.

2. The silver oxalate powder feeding device according to claim 1, characterized in that: The spray mechanism (21) comprises a first spray head (211) connected to the pure water supply mechanism (22), the first spray head (211) being fixedly connected to the flow guide (12), the first spray head (211) being arranged in a ring shape, and the axis of the first spray head (211) coincides with the axis of the flow guide (12), a plurality of first spray holes (2111) being arranged at intervals at the bottom of the first spray head (211), the aperture of the first spray hole (2111) being smaller than the particle size of the silver oxalate crystal particles of the silver oxalate powder.

3. The silver oxalate powder feeding device according to claim 2, characterized in that: The axis of the first spray hole (2111) is perpendicular to the peripheral wall of the guide portion (12).

4. The silver oxalate powder feeding device according to claim 2, characterized in that: The spray mechanism (21) further comprises a second spray head (212) in communication with the pure water supply mechanism (22); the second spray head (212) is fixedly connected to the flow guide portion (12), and the second spray head (212) is located above the first spray head (211); the top of the second spray head (212) is configured to be hemispherical; a plurality of second spray holes (2121) and a plurality of third spray holes (2122) are spaced apart on the top of the second spray head (212); the apertures of the second spray holes (2121) and the apertures of the third spray holes (2122) are smaller than the particle size of the silver oxalate crystal particles of the silver oxalate powder.

5. The silver oxalate powder feeding device according to claim 4, characterized in that: The second spray hole (2121) faces the closed portion (11), and the aperture of the second spray hole (2121) gradually decreases from bottom to top; the third spray hole (2122) faces the peripheral wall of the guide portion (12), and the position of the third spray hole (2122) is lower than that of the second spray hole (2121).

6. The silver oxalate powder feeding device according to claim 4, characterized in that: The pure water supply mechanism (22) comprises a pure water storage tank (221), the pure water storage tank (221) is located outside the silo (1), the pure water storage tank (221) is connected to the first nozzle (211) and the second nozzle (212) via a delivery pipeline (222), the delivery pipeline (222) is provided with a second solenoid valve (223) and a delivery pump (224) located outside the silo (1), the second solenoid valve (223) and the delivery pump (224) are respectively connected to the control device (3) for signal transmission.

7. The silver oxalate powder feeding device according to claim 1, characterized in that: The sealing portion (11) includes a cylindrical sealing peripheral plate and a circular sealing top plate, the bottom of the sealing peripheral plate is sealedly connected to the top of the guide portion (12), the sealing top plate is sealedly connected to the top of the sealing peripheral plate, and the sealing top plate is provided with the first feed port (111).

8. The silver oxalate powder feeding device according to claim 7, characterized in that: The silver oxalate powder feeding device further comprises an exhaust pipe (112), the exhaust pipe (112) being installed on the top surface of the sealing top plate and communicating with the interior of the silo (1), and the exhaust pipe (112) being provided with an air pressure valve (113) and a dust collector (114).

9. The silver oxalate powder feeding device according to claim 1, characterized in that: The diameter of the discharge port (121) ranges from 40 mm to 60 mm.

10. A silver oxalate solution preparation device, characterized in that: The invention comprises a reaction kettle (4) and a silver oxalate powder feeding device according to any one of claims 1 to 9, wherein a second feeding port is provided on the top of the reaction kettle (4), the silver oxalate powder feeding device is located above the second feeding port, and the discharge port (121) of the guide portion (12) is connected to the second feeding port through the first solenoid valve (122).

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