A sampling device for lithium iron phosphate precursor sand slurry

Abstract

A kind of sampling device of lithium iron phosphate precursor sand mill slurry is arranged on the main feed pipeline of sand mill discharge port, including sampling tank, feed branch pipeline, three-way regulating valve, storage tank connecting pipe and purging pipeline;The three-way regulating valve is equipped with A, B and C port;The one end of the feed branch pipeline is connected to the main feed pipeline of sand mill discharge port, and the other end of the feed branch pipeline is connected to the A port of the three-way regulating valve;The one end of the storage tank connecting pipe is connected to the B port of the three-way regulating valve, and the other end of the storage tank connecting pipe is connected to the feed port of storage tank;The sampling tank is connected to the C port of the three-way regulating valve by sampling pipeline;The one end of the purging pipeline is connected to the feed branch pipeline, and the other end of the purging pipeline is communicated with compressed gas source.Quickly collect slurry output from sand mill, effectively avoid that slurry is deposited due to long time standing, so as to guarantee the representativeness of sample.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium-ion battery material production equipment, specifically to an online sampling device for grinding slurry of lithium iron phosphate precursor. Background Technology

[0002] In the production process of lithium iron phosphate precursor materials, the particle size distribution of the slurry in the sand milling process is a core parameter affecting the performance of the final product. Currently, the industry commonly uses a tank shutdown sampling method: after the sand milling slurry enters the tank and settles, samples are obtained through sampling ports on the tank wall or by manually inserting a pipette. This method has three major technical bottlenecks: First, due to gravity, the slurry particles stratify and settle in the tank, with large particles accumulating at the bottom and small particles suspended at the top, resulting in sampling results that cannot reflect the true particle size distribution at the sand mill outlet; second, traditional single-point sampling can only obtain slurry from a local location and cannot represent the overall state of the high-speed flowing slurry in the pipeline, showing significant differences in particle size distribution; third, each sampling requires a 15-25 minute interruption of the production line, causing capacity loss and disrupting the continuity of the sand milling process. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned defects of the prior art and provide an online sampling device for lithium iron phosphate precursor grinding slurry that is compact, accurate, and efficient.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A sampling device for lithium iron phosphate precursor sand mill slurry is installed on the main feed pipe at the discharge port of the sand mill, including a sampling tank, a feed branch pipe, a three-way regulating valve, a storage tank connecting pipe and a purging pipe.

[0006] The three-way regulating valve is provided with port A, port B and port C;

[0007] One end of the feed branch pipe is connected to the main feed pipe at the outlet of the sand mill, and the other end of the feed branch pipe is connected to port A of the three-way regulating valve.

[0008] One end of the storage tank connecting pipe is connected to port B of the three-way regulating valve, and the other end of the storage tank connecting pipe is connected to the inlet of the storage tank.

[0009] The sampling container is connected to port C of the three-way regulating valve via a sampling pipe;

[0010] One end of the purging pipe is connected to the feed branch pipe, and the other end of the purging pipe is connected to the compressed air source.

[0011] Furthermore, a pneumatic ball valve is installed on the feed branch pipe.

[0012] Furthermore, one end of the purging pipe is connected to the feed branch pipe between the pneumatic ball valve and the three-way regulating valve, so that the compressed air source is connected between the pneumatic ball valve and the three-way regulating valve through the purging pipe.

[0013] Furthermore, a pneumatic ball valve is provided on the purging pipe.

[0014] Furthermore, the connection point between the purging pipe and the feed branch pipe is located near the side of the pneumatic ball valve.

[0015] Furthermore, the feed branch pipe is vertically arranged, and the inner diameter of the feed branch pipe is smaller than the inner diameter of the main feed pipe.

[0016] Furthermore, it also includes a PLC controller that can control the operation of pneumatic ball valve one, pneumatic ball valve two, and three-way regulating valve. Pneumatic ball valve one, pneumatic ball valve two, and three-way regulating valve are electrically connected to the output terminal of the PLC controller.

[0017] In summary, this utility model has the following beneficial effects:

[0018] 1. Strong sample representativeness: The sample is taken instantaneously from the flowing feed pipe, which effectively avoids the problem of particle sedimentation and stratification caused by the slurry settling, and ensures that the sample can truly reflect the particle size distribution of the slurry at the outlet of the sand mill.

[0019] 2. Automated operation and high precision: The PLC controller precisely controls the valve action and timing (especially the sampling time and purging sequence), which significantly reduces the risk of human error and ensures the accuracy and repeatability of the sampling.

[0020] 3. High sampling efficiency and no impact on production: The entire sampling process can be completed in a very short time without interrupting the production line, which greatly improves production efficiency and ensures process continuity.

[0021] 4. Strong self-cleaning ability: It uses compressed air to automatically purge the pipeline residue, effectively preventing cross-contamination of samples and ensuring the accuracy of test data.

[0022] 5. Compact and reasonable structure: The device has a high degree of integration, making it easy to install on existing production line pipelines, and the construction, commissioning and maintenance costs are low.

[0023] 6. It has a simple structure, occupies a small area, and is suitable for different environments; it is not limited to particle size testing and has a wide range of applications. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is a block diagram of the control principle of this utility model. Detailed Implementation

[0026] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings, in which the dashed lines represent the control circuit of the PCL controller. This embodiment uses the sampling of lithium iron phosphate precursor grinding slurry as an application scenario, but this utility model is not limited to this.

[0027] Example 1

[0028] like Figure 1 As shown, a sampling device for lithium iron phosphate precursor slurry in this embodiment includes a three-way regulating valve 2. Port A 21 of the three-way regulating valve 2 is vertically connected to the feed branch pipe 11. Port B 22 of the three-way regulating valve 2 is connected to the top feed inlet of the storage tank 6 via a storage tank connecting pipe 61. Port C 23 of the three-way regulating valve 2 is connected to a detachable sampling tank 3 via a sampling pipe 31. The three-way regulating valve has only two flow states: port A to port B and port A to port C. A pneumatic ball valve 4 is installed on the branch pipe between port A and the main feed pipe. A purging pipe 51 is connected to the branch pipe section 11 between the pneumatic ball valve 4 and the three-way regulating valve 2. The purging pipe 51 is led out from the compressed air source 5 and connected to the feed branch pipe 11. A pneumatic ball valve 7 is installed on the purging pipe 51 to control its on / off state. By introducing compressed air for purging, residual slurry from the previous sampling in the pipeline can be effectively removed, significantly improving the accuracy of subsequent sampling. Furthermore, the inner diameter of the feed branch pipe 11 is smaller than that of the main feed pipe 1. This design helps to maintain a relatively stable slurry flow rate within the branch pipe, thereby ensuring the consistency of the sampling volume each time.

[0029] Furthermore, the connection point between the purging pipe 51 and the feed branch pipe 11 is located near the pneumatic ball valve 4. This design helps to more thoroughly and efficiently clean residual slurry in the pipe during purging mode.

[0030] Example 2

[0031] like Figure 1-2 Except for the pneumatic ball valve 4, pneumatic ball valve 7, and three-way regulating valve 2, which are connected to the PLC controller 8 via cables, the rest of the structure is the same as in the embodiment, and will not be described in detail here. Controlling the valves on and off via the PLC controller 8 is existing technology.

[0032] In the normal conveying mode, PLC controller 8 controls the opening of pneumatic ball valve 4 and the closing of pneumatic ball valve 7, switching the three-way regulating valve 2 to the A-B passage. At this time, there are two flow paths for the slurry: one is that it flows directly into the storage tank 6 through the feed pipe 1; the other is that the slurry enters the branch pipe 11 from the feed pipe 1, then enters the A-B passage of the three-way regulating valve, and then enters the storage tank through the storage tank connecting pipe 61.

[0033] When sampling is required, PLC controller 8 controls pneumatic ball valve 4 to open and pneumatic ball valve 7 to close, switching the three-way regulating valve 2 to the A-C channel (the conduction time can be set to 1 second). The slurry enters the sampling tank 3 through the A-C channel, and automatically switches back to the A-B channel after 1 second. The slurry sample is obtained by removing the sampling tank 3.

[0034] After sampling, the pipeline is purged with compressed gas to remove slurry residue and prevent cross-contamination for subsequent sampling. Before starting the purging mode, ensure that sampling tank 3 has been removed. The purging process is as follows: First, close pneumatic ball valve 4 and open pneumatic ball valve 7. Compressed gas enters branch pipeline 11, passes through the A-B passage of three-way regulating valve 2 and the storage tank connection pipe 61, and blows the residual slurry in the pipeline to storage tank 6. Second, switch three-way regulating valve 2 to the A-C passage. Compressed gas then passes through the A-C passage to sampling pipeline 31 to remove residue from the sampling pipeline. Third, close pneumatic ball valve 7 to block gas entry. After 5 seconds, switch three-way regulating valve 2 to the A-B passage. After purging, return to the normal conveying mode to allow the slurry to flow in branch pipeline 11.

Claims

1. A sampling device for lithium iron phosphate precursor milling slurry, installed on the main feed pipe (1) at the outlet of the mill, characterized in that: It includes a sampling tank (3), a feed branch pipe (11), a three-way regulating valve (2), a storage tank connecting pipe (61), and a purging pipe (51); The three-way regulating valve (2) is provided with port A (21), port B (22) and port C (23); One end of the feed branch pipe (11) is connected to the main feed pipe (1) at the outlet of the sand mill, and the other end of the feed branch pipe (11) is connected to port A (21) of the three-way regulating valve (2). One end of the storage tank connecting pipe (61) is connected to port B (22) of the three-way regulating valve (2), and the other end of the storage tank connecting pipe (61) is connected to the inlet of the storage tank (6). The sampling container (3) is connected to port C (23) of the three-way regulating valve (2) via a sampling pipe (31); One end of the purging pipe (51) is connected to the feed branch pipe (11), and the other end of the purging pipe (51) is connected to the compressed air source (5).

2. The sampling device for lithium iron phosphate precursor grinding slurry according to claim 1, characterized in that: A pneumatic ball valve (4) is installed on the feed branch pipe (11).

3. A sampling device for lithium iron phosphate precursor grinding slurry according to claim 1 or 2, characterized in that: One end of the purging pipe is connected to the feed branch pipe (11) between the pneumatic ball valve (4) and the three-way regulating valve (2), so that the compressed air source (5) is connected between the pneumatic ball valve (4) and the three-way regulating valve (2) through the purging pipe (51).

4. The sampling device for lithium iron phosphate precursor grinding slurry according to claim 3, characterized in that: The purging pipe (51) is equipped with a pneumatic ball valve (7).

5. The sampling device for lithium iron phosphate precursor grinding slurry according to claim 3, characterized in that: The connection point between the purging pipe (51) and the feed branch pipe (11) is near the side of the pneumatic ball valve (4).

6. The sampling device for lithium iron phosphate precursor grinding slurry according to claim 3, characterized in that: The feed branch pipe (11) is vertically arranged, and the inner diameter of the feed branch pipe (11) is smaller than the inner diameter of the main feed pipe (1).

7. A sampling device for lithium iron phosphate precursor grinding slurry according to any one of claims 1-2 and 4-6, characterized in that: It also includes a PLC controller (8) that can control the operation of pneumatic ball valve 1 (4), pneumatic ball valve 2 (7) and three-way regulating valve (2), and the pneumatic ball valve 1 (4), pneumatic ball valve 2 (7) and three-way regulating valve (2) are electrically connected to the output terminal of the PLC controller (8).

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