A screening and demagnetization packaging system for carbon nanotubes

Abstract

The present invention discloses a screening, demagnetization and packaging system for carbon nanotubes, which belongs to the technical field of chemical equipment. The system includes a feeding device, a conveying device, a screening and demagnetization device, a weighing and packaging device and an automatic control device; wherein the feeding device is used for feeding, and is connected to the conveying device through a pipeline, and the conveying device is connected to the screening and demagnetization device through a pipeline, and the screening and demagnetization device is used for vibration screening and multi-stage demagnetization, and the carbon nanotubes after impurities are transported to the weighing and packaging device through the conveying pipeline; the automatic control device is used for automatic control of the system. The system of the present invention uses a vibrating screen and a dry electromagnetic iron remover for impurities removal, which effectively reduces the magnetic metal content in the carbon nanotubes, can be produced continuously, and the impurities removal is efficient and stable. In addition, the system of the present invention can also be used to remove the magnetic metal content in other carbon materials to remove harmful magnetic metal particles in battery materials.

Description

Technical Field

[0001] The invention relates to a carbon nanotube screening, demagnetization and packaging system, belonging to the technical field of chemical equipment. Background Art

[0002] In recent years, carbon nanotubes, as excellent conductive agents, have been widely used in industries such as new energy vehicle lithium batteries. This is because carbon nanotubes have excellent thermal conductivity, electrical conductivity, and good mechanical strength. In addition, the one-dimensional structure of carbon nanotubes can enhance the bonding of active materials and improve the performance of pole pieces, so they have great application prospects in new energy batteries.

[0003] Carbon nanotubes produced using catalytic chemical vapor deposition will introduce some metal particles into the product during the production process due to many factors such as the environment, raw materials, and equipment. Magnetic metal particles can easily cause self-discharge and short circuit of the battery, leading to safety hazards during use. Therefore, the carbon nanotubes produced need to be further demagnetized and packaged for safe use later. Summary of the invention

[0004] In order to solve the above-mentioned existing problems, the present invention provides a carbon nanotube screening and demagnetization packaging system, and the technical solution is as follows:

[0005] The present invention provides a screening, demagnetizing and packaging system for carbon nanotubes. The system uses a vibrating screen and a dry electromagnetic iron remover for electromagnetic impurity removal, which can effectively reduce the magnetic metal content in the carbon nanotubes, can be produced continuously, and has efficient and stable impurity removal. In addition, the screening, demagnetizing and packaging system of the present invention can also be used to remove the magnetic metal content in other carbon materials (such as carbon black and graphene) to remove harmful magnetic metal particles in battery materials.

[0006] The carbon nanotube screening, demagnetization and packaging system according to the present invention comprises a feeding device, a conveying device, a screening and demagnetization device, a weighing and packaging device and an automatic control device; wherein the feeding device is used for unpacking, feeding and storing raw materials, and is connected to the conveying device through a material conveying pipeline, and the conveying device is further connected to the screening and demagnetization device through a pipeline, and after vibration screening and demagnetization by multiple stages of screening and demagnetization devices, the decontaminated carbon nanotubes are transported to the weighing and packaging device through the conveying pipeline; the automatic control device is used to automatically control the packaging system.

[0007] According to the technical solution of the present invention, the feeding device includes a manual feeding station and a feeding storage silo. A self-cleaning respirator is provided on the feeding storage silo. The manual feeding station and the feeding storage silo are connected by a pipeline.

[0008] According to the technical solution of the present invention, the conveying device includes a vacuum conveyor and a buffer silo, wherein the vacuum conveyor is connected to the feeding storage silo and the buffer silo through a material conveying pipeline to convey the material in the feeding storage silo to the buffer silo, and the buffer silo is connected to the screening and demagnetization device through a pipeline, and a rotary solenoid valve is arranged on the connecting pipeline to control the rotary solenoid valve to make the material in the buffer silo fall to the screening and demagnetization device at a uniform speed.

[0009] According to the technical solution of the present invention, the screening and demagnetization device includes an ultrasonic vibrating screen and an electromagnetic iron remover, and the ultrasonic vibrating screen and the electromagnetic iron remover are connected by a pipeline; the ultrasonic vibrating screen is used to vibrate and remove metal foreign matter in the carbon material, and is equipped with a slag collection bucket, and the electromagnetic iron remover is used to remove metal foreign matter in the carbon material by electromagnetic adsorption, and is equipped with a small material bin and a high magnetic material receiving bucket.

[0010] According to the technical solution of the present invention, the conveying device transports the material in the buffer silo to the ultrasonic vibration screen of the screening and demagnetization device through a pipeline, and controls the rotary solenoid valve arranged on the pipeline to make the material in the buffer silo fall into the ultrasonic vibration screen at a uniform speed for screening.

[0011] According to the technical solution of the present invention, the screening and demagnetization device includes a plurality of electromagnetic iron removers for performing multi-stage demagnetization on the carbon nanotubes.

[0012] According to the technical solution of the present invention, the conveying device includes multiple vacuum conveyors, which are used to convey materials to a multi-stage demagnetization screening and demagnetization device, and to convey the carbon nanotubes after impurities are removed to a weighing and packaging device; and multiple cache silos are provided for temporarily storing materials during the conveying process.

[0013] According to the technical solution of the present invention, in one embodiment, the screening and demagnetization device includes a first electromagnetic iron remover, a second electromagnetic iron remover and a third electromagnetic iron remover, each electromagnetic iron remover is equipped with a small silo for temporarily storing materials after demagnetization; wherein the first electromagnetic iron remover is connected to the ultrasonic vibration screen through a pipeline, and performs primary demagnetization on the materials after the vibration screening, the demagnetized materials are transported into the small silo by the pipeline, and transported to the second buffer silo by the conveying device, and connected to the second electromagnetic iron remover by the pipeline for secondary demagnetization, the materials after the secondary demagnetization are transported by the conveying device and the pipeline into the third electromagnetic iron remover for tertiary demagnetization, and the materials after multi-stage demagnetization are transported by the conveying device to the weighing and packaging device.

[0014] According to the technical solution of the present invention, in one embodiment, a rotary solenoid valve is also provided on the connecting pipeline between the second cache silo and the second electromagnetic iron remover, and the material in the second cache silo falls to the second electromagnetic iron remover at a uniform speed through the control of the rotary solenoid valve.

[0015] In one embodiment, a rotary solenoid valve can also be provided on the connecting pipeline between the second electromagnetic iron remover and the third electromagnetic iron remover, and the material can be made to fall to the third electromagnetic iron remover at a uniform speed by the control of the rotary solenoid valve.

[0016] According to the technical solution of the present invention, in one embodiment, the conveying device includes a first vacuum conveyor, a second vacuum conveyor and a third vacuum conveyor, wherein the first vacuum conveyor is connected to the feeding storage bin of the feeding device through a conveying pipeline, and conveys the material in the feeding storage bin to the first buffer bin, the second vacuum conveyor is connected to the small bin of the first electromagnetic iron remover through a pipeline, and conveys the material after the first stage of demagnetization to the second buffer bin; the third vacuum conveyor is connected to the small bin of the third electromagnetic iron remover through a pipeline, and conveys the material after the third stage of demagnetization to the discharge storage bin of the weighing and packaging device.

[0017] According to the technical solution of the present invention, the automatic control device generates negative pressure through the Roots separator to pass the materials from the feeding device through the multi-stage screening and demagnetization device in sequence for demagnetization operation.

[0018] According to the technical solution of the present invention, the mesh of the vibrating screen is configured according to the particle size of the carbon material, and a mesh of 20 to 40 mesh is generally used. The magnetic field strength is indirectly set by setting the current of the electromagnetic iron remover, and the magnetic field strength is generally set at 15000GS. The high-strength magnetic field is conducive to fully adsorbing the magnetic metal impurities in the carbon material.

[0019] According to the technical solution of the present invention, the weighing and packaging device includes a discharge storage silo, a small package packaging machine, and a belt conveyor line; wherein the small package packaging machine can also be connected to a vacuum heat sealing machine to package the carbon nanotubes collected and stored in the discharge storage silo after screening and demagnetization, and the packaged and reweighed materials are transported to the finished product stacking area via a belt conveyor line.

[0020] According to the technical solution of the present invention, the weighing and packaging device is further provided with a pulse dust collector for dust removal; and a re-checking scale for re-checking the weighing.

[0021] The beneficial effects of the present invention are:

[0022] The carbon nanotube screening and demagnetization packaging system of the present invention is provided with a plurality of buffer silos in the conveying device, which can temporarily store materials during the conveying process; and a rotary solenoid valve is provided on the connecting pipeline between the buffer silo and the electromagnetic iron remover, and the material in the buffer silo is controlled by the rotary solenoid valve to fall at a uniform speed, so that the material can be fully removed of impurities.

[0023] The carbon nanotube screening, demagnetization and packaging system of the present invention uses an ultrasonic vibrating screen and multiple dry electromagnetic iron removers to perform multi-stage electromagnetic impurity removal, which can effectively reduce the magnetic metal content of carbon nanotubes and other carbon materials (for example, carbon black, graphene), and adopts a continuous conveying device to transport materials, so that production is continuous and impurity removal is efficient and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention;

[0026] Among them, 1. Control cabinet; 2. Manual feeding station; 3. Feeding storage silo; 4. Self-cleaning respirator; 5. First vacuum conveyor; 6. First buffer silo; 7. Rotary solenoid valve; 8. Ultrasonic vibrating screen; 9. Slag collection bucket; 10. First electromagnetic iron remover; 11. High magnetic material receiving bucket; 12. Small silo; 13. Second vacuum conveyor; 14. Second buffer silo; 15. Second electromagnetic iron remover; 16. Third electromagnetic iron remover; 17. Third vacuum conveyor; 18. Pulse dust collector; 19. Discharging storage silo; 20. Small package packaging machine; 21. Re-inspection scale; 22. Vacuum heat sealing machine; 23. Belt conveyor line. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] Embodiment 1:

[0029] This embodiment provides a carbon nanotube screening and demagnetization packaging system, see Figure 1 The system includes a feeding device, a conveying device, a screening and demagnetizing device, a weighing and packaging device and an automatic control device; wherein the feeding device is used for unpacking, feeding and storing raw materials, and is connected to the conveying device through a material conveying pipeline, and the conveying device is further connected to the screening and demagnetizing device through a pipeline. After vibrating and screening by multi-stage screening and demagnetizing devices, the impurity-free carbon nanotubes are transported to the weighing and packaging device through the conveying pipeline; the automatic control device is used to automatically control the packaging system.

[0030] According to the technical solution of this embodiment, the feeding device specifically includes: a manual feeding station 2 and a feeding storage silo 3, the manual feeding station 2 and the feeding storage silo 3 are connected by a pipeline; a self-cleaning respirator 4 is also provided on the feeding storage silo 3.

[0031] According to the technical solution of this embodiment, the conveying device includes a vacuum conveyor and a cache silo, wherein the vacuum conveyor is connected to the feeding storage silo and the cache silo through a material conveying pipeline to transport the material in the feeding storage silo to the cache silo, and the cache silo is connected to the screening and demagnetization device through a pipeline, and a rotary solenoid valve is arranged on the connecting pipeline to control the rotary solenoid valve to make the material in the cache silo fall to the screening and demagnetization device at a uniform speed.

[0032] According to the technical solution of this embodiment, the screening and demagnetization device includes an ultrasonic vibrating screen 8 and a plurality of electromagnetic iron removers, and the ultrasonic vibrating screen 8 and the plurality of electromagnetic iron removers are connected in sequence through pipelines; the ultrasonic vibrating screen 8 is used for vibrating screening to remove metallic foreign matter from carbon materials, and the plurality of electromagnetic iron removers are used for multi-stage demagnetization, and are equipped with a small material bin and a high-magnetic material receiving barrel.

[0033] According to the technical solution of this embodiment, the screening and demagnetization device includes an ultrasonic vibrating screen 8, which is used to vibrate and remove metal foreign matter in the carbon material, and is equipped with a slag collection bucket 9. The electromagnetic iron remover is used to remove metal foreign matter in the carbon material by electromagnetic adsorption. In one embodiment, it specifically includes a first electromagnetic iron remover 10, a second electromagnetic iron remover 15, and a third electromagnetic iron remover 16; Figure 1 As shown, each electromagnetic iron remover is equipped with a small material bin and a high magnetic material receiving barrel, for example, the high magnetic material receiving barrel 11 and the small material bin 12 of the first electromagnetic iron remover 10; the small material bin is used to temporarily store materials after demagnetization by the electromagnetic iron remover.

[0034] According to the technical solution of this embodiment, the conveying device includes multiple vacuum conveyors, which are used to convey materials to multi-stage screening and demagnetization devices, and convey the carbon nanotubes after impurities are removed to a weighing and packaging device; and multiple buffer material silos are provided for temporarily storing materials during the conveying process.

[0035] In one embodiment, the conveying device includes a first vacuum conveyor 5, a second vacuum conveyor 13 and a third vacuum conveyor 17, wherein the first vacuum conveyor 5 is connected to the feeding storage bin 3 of the feeding device through a conveying pipeline, and conveys the material in the feeding storage bin 3 to the first buffer bin 6, the second vacuum conveyor 13 is connected to the small bin 12 of the first electromagnetic iron remover through a pipeline, and conveys the material after the first stage of demagnetization to the second buffer bin 14; the third vacuum conveyor 17 is connected to the small bin of the third electromagnetic iron remover through a pipeline, and conveys the material after the third stage of demagnetization to the discharge storage bin 19 of the weighing and packaging device.

[0036] According to the technical solution of this embodiment, the conveying device transports the material in the first buffer bin 6 to the ultrasonic vibration screen 8 of the screening and demagnetization device through a pipeline, and controls the rotary solenoid valve 7 arranged on the pipeline to make the material in the buffer bin fall into the ultrasonic vibration screen 8 at a uniform speed for screening.

[0037] In the screening and demagnetization device, the first electromagnetic iron remover 10 is connected to the ultrasonic vibration screen 8 through a pipeline, and performs primary demagnetization on the material after vibration screening. The demagnetized material is transported into the small silo 12 by the pipeline, and transported to the second buffer silo 14 by the conveying device, and connected to the second electromagnetic iron remover 15 by the pipeline for secondary demagnetization. The material after secondary demagnetization is transported by the conveying device and the pipeline to the third electromagnetic iron remover 16 for tertiary demagnetization.

[0038] In one embodiment, a rotary solenoid valve is also provided on the connecting pipeline between the second buffer bin 14 and the second electromagnetic iron remover 15 , and the material in the second buffer bin 14 falls to the second electromagnetic iron remover 15 at a uniform speed through the control of the rotary solenoid valve.

[0039] In one embodiment, a rotary solenoid valve can also be provided on the connecting pipeline between the second electromagnetic iron remover and the third electromagnetic iron remover, and the material can be made to fall to the third electromagnetic iron remover at a uniform speed by the control of the rotary solenoid valve.

[0040] The screening and demagnetizing device realizes multi-stage demagnetization through the first to third electromagnetic iron removers mentioned above.

[0041] In one embodiment, the system is controlled by an automatic control device, namely Figure 1 The control cabinet 1 and the Roots distributor shown generate negative pressure to pass the materials from the feeding device through the multi-stage screening and demagnetization devices in sequence for continuous demagnetization operation.

[0042] In one embodiment, the mesh of the vibrating screen is configured according to the particle size of the carbon material, and a mesh of 20 to 40 mesh is generally used. The magnetic field strength is indirectly set by setting the current of the electromagnetic iron remover, and the magnetic field strength is generally set at 15000GS. A high-strength magnetic field is conducive to fully adsorbing magnetic metal impurities in the carbon material.

[0043] According to the technical solution of this embodiment, in one implementation, the mesh of the vibrating screen is configured according to the particle size of the carbon material, and a mesh of 20 to 40 mesh is generally used. The magnetic field strength is indirectly set by setting the current of the electromagnetic iron remover, and the magnetic field strength is generally set at 15000GS. The high-strength magnetic field is conducive to fully adsorbing the magnetic metal impurities in the carbon material.

[0044] According to the technical solution of this embodiment, the weighing and packaging device includes a discharge storage silo 19, a small package packaging machine 20, and a belt conveyor line 23, which are used to collect and store the carbon materials after screening and demagnetization, and then package, weigh, and reweigh and transport them to the finished product stacking area; wherein the small package packaging machine 20 can be connected to a vacuum heat sealing machine 22, which is used to package the carbon nanotubes collected and stored in the discharge storage silo 19 after screening and demagnetization, and the re-inspection scale 21 is used for re-inspection and weighing, and the packaging is reweighed and then transported to the finished product stacking area via the belt conveyor line 23.

[0045] According to the technical solution of this embodiment, the weighing and packaging device is also provided with a pulse dust collector 18 for dust removal; in one embodiment, the pulse dust collector can also be used to remove dust from the discharge storage silo 19.

[0046] The carbon nanotube screening, demagnetization and packaging system of the present invention uses a vibrating screen and a dry electromagnetic iron remover for multi-stage electromagnetic impurity removal, which can effectively reduce the magnetic metal content of carbon nanotubes and other carbon materials (such as carbon black and graphene), and has continuous production and efficient and stable impurity removal.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A carbon nanotube screening and demagnetization packaging system, characterized in that: The packaging system comprises: a feeding device, a conveying device, a screening and demagnetizing device, a weighing and packaging device and an automatic control device; wherein the feeding and conveying device is used for unpacking, feeding and storing carbon nanotube raw materials, and is connected to the conveying device through a material conveying pipeline, and the conveying device is connected to the screening and demagnetizing device through a pipeline, and after vibrating screening and demagnetization by the screening and demagnetizing device, the impurity-free materials are conveyed to the weighing and packaging device through the conveying pipeline; the automatic control device is used to automatically control the packaging system; The feeding device comprises a manual feeding station and a feeding storage bin, and the manual feeding station and the feeding storage bin are connected by a pipeline; The conveying device includes a vacuum conveyor and a buffer silo. The vacuum conveyor is connected to the feeding storage silo and the buffer silo through a material conveying pipeline to convey the material in the feeding storage silo to the buffer silo. The buffer silo is connected to a screening and demagnetizing device through a pipeline to convey the material in the buffer silo to the screening and demagnetizing device. The screening and demagnetization device includes an ultrasonic vibrating screen and an electromagnetic iron remover. The ultrasonic vibrating screen and the electromagnetic iron remover are connected by a pipeline, and the material in the buffer bin is controlled by a rotary solenoid valve arranged on the pipeline to make the material fall into the ultrasonic vibrating screen at a uniform speed; the ultrasonic vibrating screen is used to vibrate and remove metal foreign matter in the carbon nanotubes, and is equipped with a slag collection bucket, and the electromagnetic iron remover is used to remove metal foreign matter in the carbon material by electromagnetic adsorption, and is equipped with a small bin and a high magnetic material receiving bucket.

2. The system according to claim 1, characterized in that The screening and demagnetizing device includes a plurality of electromagnetic iron removers, which are used for performing multi-stage demagnetization on carbon nanotubes.

3. The system according to claim 1, characterized in that The conveying device includes multiple vacuum conveyors for conveying materials to a multi-stage demagnetization screening and demagnetization device, and conveying the demagnetized materials to a weighing and packaging device; and the conveying device is also provided with multiple buffer silos for temporarily storing materials during the conveying process.

4. The system according to claim 2, characterized in that The screening and demagnetization device includes a first electromagnetic iron remover, a second electromagnetic iron remover and a third electromagnetic iron remover, each of which is equipped with a small silo for temporarily storing materials after demagnetization; wherein, the first electromagnetic iron remover is connected to the ultrasonic vibration screen through a pipeline, and performs primary demagnetization on the materials after the vibration screening, and the demagnetized materials are transported into the small silo by the pipeline, and transported to the second buffer silo by the conveying device, and connected to the second electromagnetic iron remover by the pipeline for secondary demagnetization, and the materials after secondary demagnetization are transported by the conveying device and the pipeline into the third electromagnetic iron remover for tertiary demagnetization, and the materials after multi-stage demagnetization are transported to the weighing and packaging device by the conveying device.

5. The system according to claim 4, characterized in that A rotary solenoid valve is provided on the connecting pipeline between the second buffer silo and the second electromagnetic iron remover, and the material in the second buffer silo falls to the second electromagnetic iron remover at a uniform speed through the control of the rotary solenoid valve; Furthermore, a rotary solenoid valve can also be provided on the connecting pipeline between the second electromagnetic iron remover and the third electromagnetic iron remover, and the material can be made to fall to the third electromagnetic iron remover at a uniform speed by controlling the rotary solenoid valve.

6. The system according to claim 1, characterized in that The conveying device includes a first vacuum conveyor, a second vacuum conveyor and a third vacuum conveyor; wherein, the first vacuum conveyor is connected to the feeding storage bin of the feeding device through a conveying pipeline, and conveys the material in the feeding storage bin to the first buffer bin, the second vacuum conveyor is connected to the small bin of the first electromagnetic iron remover through a pipeline, and conveys the material after the first level of demagnetization to the second buffer bin; the third vacuum conveyor is connected to the small bin of the third electromagnetic iron remover through a pipeline, and conveys the material after the third level of demagnetization to the discharge storage bin of the weighing and packaging device.

7. The system according to claim 1, characterized in that The weighing and packaging device includes a discharge storage silo, a small package packaging machine, and a belt conveyor line; wherein the small package packaging machine can also be connected to a vacuum heat sealing machine to package the carbon nanotubes collected and stored in the discharge storage silo after screening and demagnetization, and the packaged and reweighed materials are transported to the finished product stacking area through the belt conveyor line.

8. The system according to claim 1, characterized in that The automatic control device generates negative pressure through the Roots separator to sequentially pass the materials from the feeding device through the multi-stage demagnetization screening and demagnetization device for continuous demagnetization operation.

9. The system according to claim 1, characterized in that The mesh of the ultrasonic vibration screen is configured according to the particle size of the carbon material; and the magnetic field strength is indirectly set by setting the current of the electromagnetic iron remover.

Images