Quantitative weighing device for lead powder

Abstract

A lead powder quantitative weighing device comprises a vibrating screen and a lead storage tank. A feeding port in the upper end of the vibrating screen is connected with a lead powder conveying auger used for conveying lead powder, and a detachable iron remover is arranged in the lead powder conveying auger. A discharging valve is arranged in a lead powder discharging opening in the lower end of the vibrating screen; the lead storage tank is located under the lead powder discharging port and hung on the supporting rod through the hanging weighing sensor, a discharging port is formed in the lower end of the lead storage tank, and the discharging port is located over a feeding port of the lead powder paste mixing machine; more than one purging spray head is annularly distributed on the inner wall of the middle lower part in the lead storage tank, one end of each purging spray head is inclined downwards, and the outlet end of each purging spray head is over against the discharge hole. The accuracy of lead powder weighing is improved, and large-particle lead sheaths and other impurities harmful to paste production in the lead powder can be removed in the weighing process.

Description

Technical Field

[0001] This utility model belongs to the technical field of battery processing equipment, and in particular relates to a quantitative weighing device for lead powder. Background Technology

[0002] Existing batteries contain electrode groups, which consist of positive and negative plates and separators. During production, the plates are coated with lead paste. Lead paste is a plastic paste-like mixture made by mixing lead powder, water, sulfuric acid, and additives in a paste mixer, resulting in physical and chemical changes. To ensure the quality of the lead paste, the precise ratio of lead powder, water, sulfuric acid, and additives must be strictly controlled during mixing. Currently, the lead powder weighing method used in paste mixers involves a conveyor belt gradually feeding lead powder into a weighing hopper. Once the specified weight is reached, the conveying stops, ready for paste mixing. However, this method suffers from instability and lack of stability in the amount of lead powder conveyed by the conveyor belt per unit time, leading to inaccurate weighing in the lead powder hopper. Furthermore, because lead powder is a particulate matter, it often remains in the weighing hopper, causing waste and making it difficult to feed it into the paste mixer in the specified standard ratio. This results in inconsistent quality of the lead paste mixed in the mixer, affecting the subsequent production quality of battery plates.

[0003] Furthermore, lead powder often contains large lead particles and iron impurities that cannot be sieved out. These large lead particles in the lead paste can cause jamming during coating, while iron impurities significantly impact the battery's self-discharge performance, causing a rapid drop in voltage when the battery is at rest and severely affecting charge and discharge performance. Therefore, it is essential to remove iron from the lead powder as thoroughly as possible to improve battery performance and quality. Current technologies do not completely remove iron from lead powder, and the centralized recovery process for these iron-containing substances is complex, inefficient, and ineffective. Summary of the Invention

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a quantitative weighing device for lead powder, which improves the accuracy of lead powder weighing and can remove harmful and large particles of lead skin and other impurities from the lead powder during the weighing process.

[0005] A quantitative weighing device for lead powder includes a vibrating screen and a lead storage tank;

[0006] The feed inlet at the upper end of the vibrating screen is connected to a lead powder conveying auger for conveying lead powder, and the lead powder conveying auger is equipped with a removable iron remover; the lead powder outlet at the lower end of the vibrating screen is equipped with a discharge valve.

[0007] The lead storage tank is located directly below the lead powder outlet and is suspended on the support rod by a suspended weighing sensor. The lower end of the lead storage tank is provided with an outlet, which is located directly above the lead powder and paste feeding port.

[0008] The inner wall of the lower part of the lead storage tank is equipped with one or more purging nozzles arranged in a ring. One end of the purging nozzle is tilted downward and its outlet end is directly opposite the discharge port.

[0009] The lead powder conveying auger has a feeding hopper at the lower inlet end and an outlet end at the upper end connected to the inlet end of the vibrating screen via a corrugated hose, which is used to lift and convey lead powder from the ground to the vibrating screen.

[0010] The lead powder conveying auger has an opening window at the top, and a cover plate is provided at the window. One end of the cover plate is hinged to the lead powder conveying auger, and the other end has a support lug protruding outward. The support lug is provided with a threaded mounting hole at the corresponding position of the upper end of the lead powder conveying auger and is fastened with bolts. The iron remover is detachably mounted on the cover plate.

[0011] The lower end of the lead storage tank is a conical shape with a gradually decreasing inner diameter.

[0012] The discharge port is equipped with a discharge valve.

[0013] The other end of the purging nozzle is connected to the air supply pipe via a pipe connector, and the other end of the air supply pipe is connected to a high-pressure nitrogen source. There is a switch valve on the air supply pipe.

[0014] It also includes a controller that can receive signals from the suspended weighing sensor and then control the operation of the feeding valve and the discharge valve.

[0015] The on / off valve, the feeding valve, and the discharge valve are all solenoid valves.

[0016] The vibrating screen is divided into upper and lower spaces by a 100-mesh sieve. One side of the vibrating screen has a lead particle outlet, which is connected to the upper space of the vibrating screen.

[0017] The advantages of this utility model compared with the prior art are:

[0018] 1. This application adds a vibrating screen between the auger and the lead storage tank. While the lead powder passes through the vibrating screen to screen out large lead particles, the lead powder can continuously enter the lead storage tank for weighing, which is highly stable. At the same time, this utility model adopts suspended weighing, which is more accurate and improves the accuracy of lead powder weighing, reducing the weighing tolerance of the original lead powder weighing chamber from 10% to 3%.

[0019] 2. The weighing process removes harmful lead powder, large lead particles from the paste production, and other impurities. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation Example 1

[0021] like Figure 1As shown, the lead storage tank 9 is suspended on the support rod 7 by a suspended weighing sensor 8. The lower end of the lead storage tank 9 is a tapered structure that gradually decreases in size. At the bottom end, there is a discharge port 11, which is located directly above the paste mixing machine. The inner wall of the lead storage tank 9 has multiple openings, and a purge nozzle 10 is sealed and welded at each opening. One end of the purge nozzle 10 is tilted downward and faces the discharge port. The other end of the purge nozzle 10 is connected to the gas supply pipe via a pipe connector. The other end of the gas supply pipe is connected to a high-pressure nitrogen gas source. There is a switch valve on the gas supply pipe, and a discharge valve is installed at the discharge port 11. A vibrating screen 4 is installed above the lead storage tank 9. The vibrating screen 4 is mounted on a platform, and the support rod 7 is fixed on the platform. The platform is supported by a bracket (this part of the structure is not shown in the diagram, as it is prior art and will not be described in detail in this embodiment). The vibrating screen 4 has a feed inlet at the top and a lead powder outlet at the bottom. The lead powder outlet is located directly above the lead storage tank 9. A discharge valve 6 is installed at the lead powder outlet. The inside of the vibrating screen 4 is divided into upper and lower spaces by a sieve 3 that is inclined to one end. The sieve 3 is 100 mesh. There is a lead particle output port 5 on one side of the vibrating screen 4, which is connected to the upper space of the vibrating screen 4. The vibrating screen 4 can adopt the existing structure. The feed inlet at the upper end of the vibrating screen 4 is connected to the lead powder conveying auger 1 for conveying lead powder. The feed inlet end of the lead powder conveying auger 1 is equipped with a feeding hopper, and the outlet end at the upper end is connected to the feed inlet end of the vibrating screen 4 via a corrugated hose 12 for lifting and conveying lead powder from the ground to the vibrating screen 4. The upper end of the lead powder conveying auger 1 has an opening window, and a cover plate 13 is provided at the window. One end of the cover plate 13 is hinged to the lead powder conveying auger 1, and the other end has a support ear protruding outward. The support ear is provided with a threaded mounting hole at the corresponding position of the upper end of the lead powder conveying auger 1 and is fastened with bolts. A removable iron remover 2 is installed on the cover plate 13. The iron remover 2 is located in the gap between the inner wall of the cover plate 13 and the conveying auger screw. The iron remover 2 is a strong magnet. Example 2

[0022] It also includes a controller that can receive signals from the suspended weighing sensor 8 and then control the operation of the feeding valve 6 and the discharge valve. The switching valve, the feeding valve 6 and the discharge valve are all solenoid valves.

[0023] In operation, lead powder enters the vibrating screen 4 via the iron remover 2 in the lead powder conveying auger 1. The screening screen in the vibrating screen 4 screens the lead powder. Qualified lead powder flows downward through the discharge valve 6 at the lead powder outlet and enters the lead storage tank 9. Lead powder with a larger particle size that is not qualified leaves the system through the lead particle output port 5 and returns to the lead powder mill for further grinding. The suspended weighing sensor 8 detects the weight of the lead storage tank 9. When the weight is sufficient, a signal is sent to the controller to close the discharge valve 6 and open the discharge valve. The lead powder enters the next grinding and paste-making process through the discharge port 11. When the lead powder discharge is about to end, the controller controls the switch valve on the air supply pipe to open, and nitrogen enters the purging nozzle 10 to start purging, ensuring that the lead powder completely leaves the lead storage tank. At the same time, the nitrogen in the lead storage system can also prevent the lead powder from spontaneously combusting.

Claims

1. A quantitative weighing device for lead powder, characterized in that: Includes a vibrating screen (4) and a lead storage tank (9); The feed inlet at the upper end of the vibrating screen (4) is connected to the lead powder conveying auger (1) for conveying lead powder, and the lead powder conveying auger (1) is equipped with a removable iron remover (2); the lead powder outlet at the lower end of the vibrating screen (4) is equipped with a discharge valve (6). The lead storage tank (9) is located directly below the lead powder outlet and is suspended on the support rod (7) by a suspended weighing sensor (8). The lead storage tank (9) has an outlet (11) at its lower end, which is located directly above the lead powder and paste machine feed port. The lead storage tank (9) has one or more purge nozzles (10) arranged in a ring on the inner wall of the lower middle part. One end of the purge nozzle (10) is tilted downward and its outlet end is directly opposite the discharge port (11).

2. The lead powder quantitative weighing device according to claim 1, characterized in that: The lead powder conveying auger (1) has a feeding hopper at the lower inlet end and an outlet end at the upper end connected to the inlet end of the vibrating screen (4) via a corrugated hose (12) to lift and convey lead powder from the ground to the vibrating screen (4).

3. A lead powder quantitative weighing device according to claim 1 or 2, characterized in that: The lead powder conveying auger (1) has an opening window at the top, and a cover plate (13) is provided at the window. One end of the cover plate (13) is hinged to the lead powder conveying auger (1), and the other end has a support ear protruding outward. The support ear is provided with a threaded mounting hole at the corresponding position of the upper end of the lead powder conveying auger (1) and is fastened with bolts. The iron remover (2) is detachably mounted on the cover plate (13).

4. The lead powder quantitative weighing device according to claim 1, characterized in that: The lower end of the lead storage tank (9) is a conical shape with a gradually decreasing inner diameter.

5. The lead powder quantitative weighing device according to claim 1, characterized in that: A discharge valve is installed at the discharge port (11).

6. The lead powder quantitative weighing device according to claim 1, characterized in that: The other end of the purge nozzle (10) is connected to the gas supply pipe via a pipe connector, and the other end of the gas supply pipe is connected to a high-pressure nitrogen gas source. There is a switch valve on the gas supply pipe.

7. A lead powder quantitative weighing device according to claim 6, characterized in that: It also includes a controller that can receive signals from the suspended weighing sensor (8) and then control the operation of the feeding valve (6) and the discharge valve.

8. A lead powder quantitative weighing device according to claim 7, characterized in that: The switching valve, the feeding valve (6), and the discharge valve are all solenoid valves.

9. A quantitative weighing device for lead powder according to claim 1, characterized in that: The vibrating screen (4) is divided into upper and lower spaces by a screening mesh (3) with a mesh size of 100. The vibrating screen (4) has a lead particle outlet (5) on one side, which is connected to the upper space of the vibrating screen (4).

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