Automatic powder filling system

Abstract

The utility model discloses a kind of powder automatic filling system, including buffer storehouse, bowl filling machine and crucible, the bowl filling machine is connected with negative pressure fan, filter device is installed in the pipeline between the two, the material level in the crucible is detected by material level detection device, the material level detection device is with negative pressure fan lock control.The utility model is filled under negative pressure, improves material sintering density, improves 10% of the amount of filling of crucible under the condition that not more than crucible volume, and then reduce the energy consumption of lithium iron phosphate positive electrode material preparation process, and the negative pressure air extraction device and the material level in crucible interlock, the integrated control of negative pressure in system is realized by the amount of filling of crucible, and system is high in degree of automation.

Description

Technical Field

[0001] This utility model relates to a filling system, and more particularly to an automatic powder filling system. Background Technology

[0002] Kiln sintering is a crucial step in the preparation of lithium iron phosphate cathode materials. In this process, the material to be sintered is loaded into the crucible of the track kiln by a loading machine and sintered under nitrogen protection. The kiln sintering process consumes a significant amount of electricity, accounting for half of the total electricity consumption in the lithium iron phosphate cathode material preparation process.

[0003] In existing technologies, the filling capacity of a single crucible is 7-8 kg. Increasing the crucible filling capacity can effectively reduce the power consumption of the kiln sintering process. However, due to the limited internal volume of the crucible, material exceeding the crucible's capacity will leak out, causing serious damage to the track kiln. Utility Model Content

[0004] Purpose of the utility model: This utility model provides an automatic powder filling system that effectively increases the filling amount of crucible without changing the filling volume of the crucible.

[0005] Technical solution: The automatic powder filling system of this utility model includes a buffer bin, a filling machine and a crucible. The filling machine is connected to a negative pressure fan, and a filter device is installed in the pipeline between the two. The material level in the crucible is detected by a material level detection device, and the material level detection device is interlocked with the negative pressure fan.

[0006] A filter bag is installed between the negative pressure fan and the filling machine to collect the material that is pumped away.

[0007] The filter bag is connected to a backflushing device, which is connected to an adjustable pressure air source and can perform backflushing periodically to prevent material from sticking to the filter bag.

[0008] The filter bag is connected to the buffer chamber, and the material collected in the filter bag can be discharged into the buffer chamber for recycling, thus avoiding waste.

[0009] The filter bag is located above the buffer chamber, and a first self-controlled valve is installed on the pipeline between the two. The valve can be opened and closed by a timer, so that the material in the filter bag is automatically discharged into the buffer chamber by gravity.

[0010] The negative pressure fan is a variable frequency fan, and the frequency of the fan during operation is interlocked and controlled by the material level detection device.

[0011] The negative pressure extraction device is connected to the filling machine using a flexible pipe to reduce the impact of the negative pressure extraction device on the filling machine's weighing system.

[0012] The buffer compartment is located above the potting machine, and a second self-controlled valve is installed on the pipeline between the two.

[0013] Beneficial effects: Compared with the prior art, the present invention has the following advantages: (1) The crucible is filled under negative pressure, which increases the sintering density of the material. The crucible filling amount is increased by 10% without exceeding the crucible volume, thereby reducing the energy consumption of the lithium iron phosphate cathode material preparation process; (2) The negative pressure pumping device is interlocked with the material level in the crucible. The negative pressure in the system is integrated and controlled by the crucible filling amount, and the system has a high degree of automation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0015] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0016] See Figure 1 The automatic powder filling system of this utility model includes a buffer bin 1, a filling machine 2, and a crucible 3. The filling machine 2 is connected in sequence to a filter device 5, a filter bag 7, and a negative pressure fan 4 via pipelines. The buffer bin 1 is located above the filling machine 2, and the filter bag 7 is located above the buffer bin 1, wherein the filter bag 7 is connected to a back-blowing device 8. The material level in the crucible 3 is detected by a material level detection device 6, which is interlocked with the negative pressure fan 4. The buffer bin 1 is equipped with a first weighing module 11 and an exhaust device 14, and the filling machine 2 is equipped with a feeding motor 12 and a second weighing module 13.

[0017] The negative pressure fan 4 is started. At this time, the first automatic control valve 9 is closed and the second automatic control valve 10 is open, and the system is under negative pressure. The material to be sintered enters the buffer chamber 1 through the normal feed pipe, is weighed by the first weighing module 11, and then falls into the crucible 2. At this time, the feeding motor 12 is started, and the material is further weighed by the second weighing module 13 and falls into the crucible 3 to be filled, where it is compacted under the action of negative pressure. The filtration device 5 can be a filter screen or filter to minimize the removal of the material to be sintered under negative pressure, and the filter bag 7 is used to collect the removed material. During the feeding process, the air in the buffer chamber 1 is discharged through the exhaust device 14.

[0018] The material level detection device 6 uses a non-contact level sensor, installed above the crucible 3 after it has been filled and is ready to be transported to the next process. When the material level is higher than the preset value, the speed of the negative pressure fan 4 is increased to increase the negative pressure in the system, thus reducing the material level in the crucible 3 to be filled. When the material level is lower than the preset value, the speed of the negative pressure fan 4 is decreased to reduce the negative pressure in the system, thus increasing the material level in the crucible 3 to be filled. After the filled crucible 3 passes the material level detection, it is sent to the track kiln for the subsequent sintering process.

[0019] During the filling process, the slag discharge time can be set by setting a timer connected to the first automatic control valve 9. When the set time is reached, the first automatic control valve 9 opens, and the material accumulated in the filter bag 7 falls into the buffer chamber 1 to participate in subsequent filling. The backflushing device 8 can be activated to blow off the material accumulated on the wall of the filter bag 7, causing it to fall into the buffer chamber 1. After the backflushing is completed, the backflushing device 8 and the first automatic control valve 9 are closed.

Claims

1. An automatic powder filling system, comprising a buffer bin (1), a filling machine (2), and a crucible (3), characterized in that, The filling machine (2) is connected to a negative pressure fan (4), and a filter device (5) is installed in the pipeline between the two. The material level in the crucible (3) is detected by a material level detection device (6), and the material level detection device (6) is interlocked with the negative pressure fan (4).

2. The automatic powder filling system according to claim 1, characterized in that, A filter bag (7) is installed between the negative pressure fan (4) and the potting machine (2).

3. The automatic powder filling system according to claim 2, characterized in that, The filter bag (7) is connected to a backflushing device (8).

4. The automatic powder filling system according to claim 2, characterized in that, The filter bag (7) is connected to the buffer compartment (1).

5. The automatic powder filling system according to claim 4, characterized in that, The filter bag (7) is located above the buffer chamber (1), and a first self-controlled valve (9) is installed on the pipeline between them.

6. The automatic powder filling system according to claim 1, characterized in that, The negative pressure fan (4) is a variable frequency fan.

7. The automatic powder filling system according to claim 1, characterized in that, The negative pressure fan (4) and the potting machine (2) are connected by a flexible pipe.

8. The automatic powder filling system according to claim 1, characterized in that, The buffer compartment (1) is located above the potting machine (2), and a second self-controlled valve (10) is installed on the pipeline between the two.

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