CN112705358A - Laboratory is with small batch volume permanent magnetism deironing device - Google Patents
Laboratory is with small batch volume permanent magnetism deironing device Download PDFInfo
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- CN112705358A CN112705358A CN202011580398.2A CN202011580398A CN112705358A CN 112705358 A CN112705358 A CN 112705358A CN 202011580398 A CN202011580398 A CN 202011580398A CN 112705358 A CN112705358 A CN 112705358A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/10—Magnetic separation acting directly on the substance being separated with cylindrical material carriers
- B03C1/12—Magnetic separation acting directly on the substance being separated with cylindrical material carriers with magnets moving during operation; with movable pole pieces
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Abstract
The invention discloses a small-batch permanent magnet deironing device for a laboratory, which comprises a motor and a speed reducer which are sequentially connected, wherein the output end of the speed reducer is provided with two output shafts, a first output shaft is fixed in a first support, and a second output shaft is connected with a first gear; the left end of the rotating shell is fixed on the first support, the right end of the rotating shell is fixed on the second support, and the rotating shell and the second gear are integrated and are connected with the first gear through the second gear; a plurality of sleeves are arranged in the rotary shell, one ends of the sleeves are fixed on a sleeve tray, and the sleeve tray is connected with the first output shaft in a matching manner; the other end of the sleeve is connected with a transition support on the inner side of the second support, one end of the magnetic rod is arranged in the sleeve, and the other end of the magnetic rod is connected with the transition support to form a whole, and the sleeve, the magnetic rod and the transition support are driven by the first output shaft to rotate; the main support is connected with the third support and the fourth support. The device has low price and high iron removal efficiency, and can meet the iron removal requirements of small-batch production and laboratories of lithium ion battery materials.
Description
Technical Field
The invention relates to a small-batch permanent magnet deironing device for a laboratory, which is applied to intermittently and circularly removing magnetic foreign matters of powder materials in small batches.
Background
The lithium ion battery industry is driven by the new energy industry to continuously and rapidly grow; the development of lithium ion batteries must meet higher requirements for ensuring service life and safety. Since the magnetic foreign matter has a very critical influence on the safety performance of the lithium battery, in order to obtain higher safety performance of the lithium battery, higher requirements are inevitably required to the management and control of the magnetic foreign matter in the production process of the lithium battery material, at present, the magnetic foreign matter of the battery material is generally controlled within 50ppb, and the magnetic foreign matter of the cathode material used on Tesla such as NCA is required to be controlled within 1 Oppb. However, in the prior art, the lithium ion battery material is required to pay attention to the whole production flow, pretreatment processes such as raw material, reaction and separation, and post-treatment processes such as drying, screening and packaging to ensure higher magnetic anisotropy control requirements in order to remove magnetic foreign matters.
At present, in the iron removal process of mass production of lithium ion battery materials, a common electromagnetic iron remover and common equipment are expensive, the materials flow from top to bottom in a unidirectional way under the action of gravity and do not have the function of wireless circulating iron removal, and an electromagnet and a pipe wall are in a static state; the common powder pipeline iron remover is the same as the electromagnetic iron remover, except that the magnetic part of the pipeline iron remover is a permanent magnet iron remover, materials flow from top to bottom in a one-way mode under the action of gravity and do not have the function of wireless circulating iron removal, an electromagnet and a pipe wall are in a static state, the materials cannot be in full contact with magnetic rods, and the requirement for iron removal can be met only by increasing the number of the magnetic rods or overlapping a plurality of iron removers or increasing the number of iron removal times; some manufacturers improve the powder pipeline deironing device, and the bar magnet in the pipeline is driven by the motor to enable the bar magnet to rotate, so that the device has the advantages that each bar magnet can be in more sufficient contact with materials, the deironing performance of each bar magnet is exerted, however, the pipe wall is still, and sufficient contact is limited.
The iron remover for small-batch production and laboratory production of lithium ion battery materials does not have a better and proper solution at present. The existing solutions are: the deironing function of a small batch in a laboratory is realized through the miniaturization of mass production equipment, and the deironing function has the defect of expensive quotation, and if the deironing needs to be circulated, the deironing requirement is met by increasing the number of magnetic rods or overlapping a plurality of deironing devices or increasing the deironing times; secondly, the iron-removing materials in the laboratory are treated by simple manual stirring with a magnetic bar, and the defects of time and labor waste, poor effect and easy pollution in the manual operation process are overcome.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a small-batch permanent magnet deironing device for a laboratory.
The invention is realized by the following technical scheme.
A small-batch permanent magnet deironing device for a laboratory comprises a motor (1) and a speed reducer (2) which are sequentially connected, wherein the output end of the speed reducer (2) is provided with two output shafts, namely a first output shaft (3) and a second output shaft (4), the output rotating directions of the first output shaft (3) and the second output shaft (4) are opposite, the first output shaft (3) is fixed in a first support (6), and the second output shaft (4) is connected with a first gear (7) through key groove interference fit; the left end of the rotating shell (8) is fixed on the first support (6), the right end of the rotating shell (8) is fixed on the second support (11), the rotating shell (8) and the second gear (12) are integrated, and the rotating shell and the second gear are connected with the first gear (7) through the second gear (12); a plurality of sleeves (13) are arranged in a cavity of the rotary shell (8), one ends of the sleeves are fixed on a sleeve tray (14) through welding or bolts and form a whole with the sleeve tray, and the sleeve tray (14) is in clearance fit connection with the first output shaft (3) through a sleeve spline (15); the other end of the sleeve is connected with a transition support (35) on the inner side of the second support (11) through a first quick-assembling bolt (32), the transition support (35) is connected with the second support (11) through a fourth bearing (20), one end of the magnetic rod (16) is arranged in the sleeve, the other end of the magnetic rod is connected with the transition support (35) on the inner side of the second support (11) through the first quick-assembling bolt (32), the sleeve (13), the magnetic rod (16) and the transition support (35) are integrated, and the sleeve, the magnetic rod (16) and the transition support (35) are driven by the first output shaft (3) to rotate; the main support (17) is connected with the third support (18) and the fourth support (19) through bearings, so that the third support (18) and the fourth support (19) can rotate around the bearings; the first support (6), the second support (11), the third support (18) and the fourth support (19) are fixed through bolts or integrally formed, so that a supporting structure which integrally and fixedly rotates relative to the rotary shell (8) and the sleeve (13) is formed.
Preferably, due to the matching design of gears inside the speed reducer (2), the rotating directions of the first output shaft (3) and the second output shaft (4) are opposite, namely the first output shaft (3) rotates clockwise and the second output shaft (4) rotates anticlockwise, or the first output shaft (3) rotates anticlockwise and the second output shaft (4) rotates clockwise.
Preferably, the second gear (12) is externally tangent and connected with the first gear (7), and the rotation speed ratio of the second gear (12) to the first gear (7) ranges from 1:3 to 1: 16, rotating the shell (8) and the magnetic bar (16) at a rotating speed ratio of 1: 3-1: 16, and the rotation directions are opposite to each other, and do relative movement.
Preferably, the first output shaft (3) is fixed in the first support (6) through a first bearing (5), and the second output shaft (4) is connected with the first gear (7) through a key groove in an interference fit manner; the left end of the rotating shell (8) is fixed on the first support (6) through a second bearing (9), and the right end of the rotating shell (8) is fixed on the second support (11) through a third bearing (10).
Preferably, the second support (11) comprises an outer end and an inner end, the outer end of the second support (11) is connected and supported with the rotating shell (8) through a third bearing (10), and the inner end of the second support (11) is connected with the transition support (35) through a fourth bearing (20).
Preferably, a third support end cover (21) and a fourth support end cover (22) are arranged on the outer sides of the third support (18) and the fourth support (19).
Preferably, the third support end cover (21) and the fourth support end cover (22) are fixed by being connected with the main support (17) through bolt holes on the end covers through bolts; an annular slide way (23) is arranged on the main support (17), the third support end cover (21) and the fourth support end cover (22) are located in the annular slide way (23), inclination angle marks are arranged on the periphery of the annular slide way, and the inclination angles of the motor speed reducer, the rotary cylinder and the sleeve as a whole can be read through pointers on the third support end cover (21) and the fourth support end cover (22).
Preferably, 4 universal wheels for supporting and moving the whole device are arranged below the main support (17).
The invention has the beneficial technical effects that:
according to the small-batch permanent magnet deironing device for the laboratory, the rotation directions of the magnetic part (magnetic rod) and the cylinder part (rotary cylinder) are opposite, and the magnetic part (magnetic rod) and the cylinder part (rotary cylinder) move oppositely, so that materials are fully stirred and fully contacted, and a closed space can remove iron in a unit amount of materials in a reciprocating mode. The device has low price and high iron removal efficiency, and can meet the iron removal requirements of small-batch production and laboratories of lithium ion battery materials.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a side view of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2 in accordance with the present invention;
FIG. 4 is a cross-sectional view taken along line B-B of FIG. 1 in accordance with the present invention;
FIG. 5 shows a stand-by/standby state at an angle of-90 degrees according to the present invention;
FIG. 6 is a view showing a use/operation state of the present invention with an inclination angle of 0 degree;
fig. 7 shows the present invention in a shutdown discharge state with an inclination angle of 90 degrees.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The utility model provides a small batch volume permanent magnetism deironing device is used in laboratory, including the motor 1 that connects gradually, speed reducer 2, 2 outputs of speed reducer have two output shafts, first output shaft 3 and second output shaft 4 promptly, and first output shaft 3 and second output shaft 4 output direction of rotation are each other in the opposite direction, first output shaft 3 is fixed in first support 6 through first bearing 5, the 3 outputs of first output shaft pass through the spline and are connected with 14 clearance fit of tray, second output shaft 4 passes through keyway interference fit and is connected with first gear 7.
A shoveling plate 24 is arranged on the inner wall of the rotating shell 8, the left end of the rotating shell 8 is fixed on the first support 6 through a second bearing 9, the right end of the rotating shell 8 is fixed on a second support 11 through a third bearing 10, the rotating shell 8 and the second gear 12 are integrated and connected with the first gear 7 through the second gear 12; the second gear 12 is externally tangent and connected with the first gear 7, and the rotating speed ratio range of the second gear 12 to the first gear 7 is 1: 3-1: 16, rotating the shell 8 and the magnetic bar 16 at a rotating speed ratio of 1: 3-1: 16, the rotation directions are opposite to each other, and the rotating shell 8 is driven by the second output shaft 4 to rotate; a plurality of sleeves 13 are arranged in the cavity of the rotary shell 8, one ends of the sleeves are fixed on a sleeve tray 14 through welding or bolts and form a whole with the sleeve tray 14, and the sleeve tray 14 is in clearance fit connection with the first output shaft 3 through a sleeve spline 15; the other end of the sleeve is connected with a transition support 35 on the inner side of the second support 11 through a first quick-assembling bolt 32, the transition support 35 is connected with the second support 11 through a fourth bearing 20, one end of the magnetic rod 16 is arranged in the sleeve, and the other end of the magnetic rod is connected with the transition support 35 on the inner side of the second support 11 through the first quick-assembling bolt 32 to form the sleeve 13, the magnetic rod 16 and the transition support 35 into a whole.
The second support 11 comprises an outer end and an inner end, the outer end of the second support 11 is connected with the rotating shell 8 through a third bearing 10, and the inner end of the second support 11 is connected with a transition support 35 through a fourth bearing 20. The sleeve and the magnetic rod are integrated, the left end of the sleeve and the magnetic rod are fixed by the first bearing 5, the right end of the sleeve and the magnetic rod are fixed by the fourth bearing 20, and after the first quick-assembling bolt 32 is disassembled, the sleeve and the magnetic rod can be taken out from the rotating shell 8 together at the right side by holding the sleeve handle 29; then the magnetic rod handle 30 is held, so that the magnetic rod can be taken out from the sleeve from the right side; the transition support 35, which forms the inner ends of the sleeve 13, the magnetic bar 16 and the second support 11, is integrated and rotated by the first output shaft 3, and the left end of the whole is fixedly supported by the first bearing 5 and the right end is fixedly supported by the fourth bearing 20.
The main support 17 is connected with the third support 18 and the fourth support 19 through a fifth bearing 25 and a sixth bearing 26, so that the third support 18 and the fourth support 19 can rotate around the bearings; the first support 6, the second support 11, the third support 18 and the fourth support 19 are fixed by bolts or integrally formed to form a support structure which integrally fixes the rotary housing 8 and the sleeve 13.
The outer sides of the third support 18 and the fourth support 19 are provided with a third support end cover 21 and a fourth support end cover 22, and the third support end cover 21 and the fourth support end cover 22 are fixed by being connected with the main support 17 through bolt holes on the end covers; an annular slide way 23 is arranged on the main support 17, the third support end cover 21 and the fourth support end cover 22 are located in the annular slide way 23, inclination angle marks are arranged on the periphery of the annular slide way, and the inclination angle of the motor speed reducer, the rotary cylinder and the sleeve as a whole can be read through pointers on the third support end cover 21 and the fourth support end cover 22.
4 universal wheels for supporting and moving the whole device are arranged below the main support 17.
Description of the use procedure:
equipment halt or waiting state: in a standby state, because no material exists, the gravity center is deviated to the end of the motor speed reducer, meanwhile, the third supporting end cover 21 and the fourth supporting end cover 22 are in a loose state through the second quick-assembling bolts 34 on the end covers, the machine body rotates around the fifth bearing 25 and the sixth bearing 26, the end of the motor speed reducer naturally sags under the action of gravity, and the inclination pointer 33 points to minus 90 degrees.
Feeding by equipment: when the equipment is stopped or in a waiting state, the first quick-assembling bolts 32 on the sleeve end cover 27 and the magnetic rod end cover 28 are loosened, and the sleeve handle is held to take the sleeve and the magnetic rod together from the rotary shell at the upper side; after being taken out, the magnetic rod is vertically placed upwards, and then the magnetic rod handle is held to take the magnetic rod out of the sleeve from the upper side; simultaneously cleaning the inner part of the shell, the inner side and the outer side of the sleeve and the end covers thereof, the magnetic bar and the end covers thereof; after cleaning, pouring a proper amount of materials into the shell, then holding a magnetic rod handle to enable the magnetic rod to be sleeved into the sleeve from the upper side downwards, holding the sleeve handle to enable the sleeve and the magnetic rod to be sleeved into the rotary shell from the upper side downwards, then fastening the sleeve end cover and the fast-assembling bolt on the magnetic rod end cover, connecting the sleeve magnetic rod and the shell into a whole, and sealing the shell; this time the feed is complete.
Equipment use or operating conditions: after the feeding is finished, adjusting equipment to be in a use or running state, closing the protective cover, then starting a power supply of the motor, and adjusting the frequency of the motor according to process requirements so as to adjust the rotating speed of the sleeve magnetic rod and adjust the rotating speed of the rotating shell; meanwhile, the startup time is controlled according to the process requirements, and theoretically, the rotating speed is high, the time is long, and the iron removal effect is better.
In a use or operation state, due to the existence of materials, the gravity center of the machine body is balanced, and meanwhile, the third supporting end cover 21 and the fourth supporting end cover 22 are adjusted to pass through the positions of the second quick-assembling bolts 34 on the end covers, so that the machine body rotates around the fifth bearing 25 and the sixth bearing 26, the inclination angle of the machine body is horizontal, the inclination angle pointer 33 points to 0 degree, and meanwhile, the third supporting end cover 21 and the fourth supporting end cover 22 are fastened to pass through the bolts on the end covers so as to keep the machine body horizontal; meanwhile, when the equipment runs, the outer sides of the third support 18 and the fourth support 19 are provided with protective covers for covering the exposed rotating shell and the rotating third bearing 10 and the rotating fourth bearing 20, so that the safety protection effect is achieved.
The equipment is stopped and unloaded: under the state of shutting down and unloading, because there is the material, the organism focus is balanced, adjusts third support end cover 21, fourth support end cover 22 simultaneously and passes through the second fast-assembling bolt 34 position on the end cover for the organism is rotatory around fifth bearing 25, sixth bearing 26, and motor reducer port is vertical upwards, and inclination pointer 33 points to 90, fastens third support end cover 21, fourth support end cover 22 simultaneously and passes through second fast-assembling bolt 34 on the end cover, in order to keep organism motor reducer port vertical upwards.
When the equipment stops, unloads and cleans, the frequency of the motor is adjusted to 0, the power supply of the motor is cut off after the rotating shell 8 is static, and then the protective cover is opened; adjusting equipment to stop the machine or wait for the material, loosening the quick-assembling bolts on the sleeve end cover 27 and the magnetic rod end cover 28, holding the sleeve handle to take the sleeve 13 and the magnetic rod 16 out of the rotary shell together at the upper side, adsorbing magnetic foreign matters on the outer wall of the sleeve due to the action of the magnetic rod, and vertically placing the sleeve upwards after taking out; at the moment, the port of the shell is opened, the bag for collecting the product is sleeved on the port of the shell, the equipment is adjusted to be in a shutdown unloading state, the finished product material falls into the bag for collecting the product under the action of gravity, and the bag is taken down after the sample is collected and is hermetically placed for a subsequent step; after the product is collected, the waste is treated, the magnetic rod can be taken out from the sleeve from the upper side by holding the magnetic rod handle, at the moment, the magnetic rod 16 is pulled out from the sleeve 13, the sleeve has no magnetic field, and the magnetic foreign matters adsorbed on the outer side of the sleeve lose acting force and then fall into the sleeve tray 14 to clean the magnetic foreign matters in time; simultaneously cleaning the inner part of the shell, the inner side and the outer side of the sleeve and the end covers thereof, the magnetic bar and the end covers thereof; after cleaning, the magnetic rod can be sleeved into the sleeve from the upper side downwards by holding the magnetic rod handle, the sleeve and the magnetic rod can be sleeved into the rotary shell 8 from the upper side downwards by holding the sleeve handle, then the sleeve end cover and the quick-assembling bolt on the magnetic rod end cover are fastened, the sleeve magnetic rod and the shell are connected into a whole, and the shell is sealed; and finishing unloading and cleaning.
If the product is qualified, the next batch of material treatment can be carried out; if not, the iron can be fed again for removing.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention. It should be noted that other equivalent modifications can be made by those skilled in the art in light of the teachings of the present invention, and all such modifications can be made as are within the scope of the present invention.
Claims (10)
1. The small-batch permanent magnet deironing device for the laboratory is characterized by comprising a motor (1) and a speed reducer (2) which are sequentially connected, wherein the output end of the speed reducer (2) is provided with a first output shaft (3) and a second output shaft (4), the first output shaft (3) is fixed in a first support (6), and the second output shaft (4) is connected with a first gear (7) through a key groove in an interference fit manner; the left end of the rotating shell (8) is fixed on the first support (6), the right end of the rotating shell is fixed on the second support (11), and the rotating shell (8) is connected with the first gear (7) through the second gear (12); a plurality of sleeves (13) are arranged in a cavity of the rotary shell (8), one ends of the sleeves are fixed on a sleeve tray (14), and the sleeve tray (14) is in clearance fit connection with the first output shaft (3) through a sleeve spline (15); the other end of the sleeve is connected with a transition support (35) on the inner side of the second support (11), the transition support (35) is connected with the second support (11), one end of the magnetic rod (16) is arranged in the sleeve, and the other end of the magnetic rod is connected with the transition support (35) on the inner side of the second support (11); the main support (17) is connected with the third support (18) and the fourth support (19) through bearings, so that the third support (18) and the fourth support (19) can rotate around the bearings.
2. The small-batch permanent magnet iron removal device for the laboratory according to claim 1, wherein the magnet bar (16) is connected with a transition support (35) inside the second support (11) through a first quick-assembly bolt (32).
3. The small-batch permanent magnet iron removal device for the laboratory according to claim 1, wherein the first support (6), the second support (11), the third support (18) and the fourth support (19) are fixed by bolts or integrally formed, and relatively rotating housings (8) and sleeves (13) are fixed support structures.
4. The small-batch permanent magnet deironing device for the laboratory according to claim 1, characterized in that the first output shaft (3) and the second output shaft (4) are opposite in rotation direction.
5. The small-batch permanent magnet deironing device for the laboratory according to claim 1, characterized in that the second gear (12) is externally tangent to the first gear (7), and the rotation speed ratio of the second gear (12) to the first gear (7) is 1: 3-1: 16, rotating the shell (8) and the magnetic bar (16) at a rotating speed ratio of 1: 3-1: 16, and the rotation directions are opposite to each other.
6. The small-batch permanent magnet deironing device for the laboratory according to claim 1, characterized in that the first output shaft (3) is fixed in the first support (6) through a first bearing (5), and the second output shaft (4) is connected with the first gear (7) through a key groove interference fit; the left end of the rotating shell (8) is fixed on the first support (6) through a second bearing (9), and the right end of the rotating shell (8) is fixed on the second support (11) through a third bearing (10).
7. The small-batch permanent magnet iron removal device for the laboratory according to claim 1, wherein the second support (11) comprises an outer end and an inner end, the outer end of the second support (11) is connected and supported with the rotary housing (8) through a third bearing (10), the inner end of the second support (11) is connected with a transition support (35) through a fourth bearing (20), and the sleeve is connected with the transition support (35) on the inner side of the second support (11) through a first quick-assembling bolt (32).
8. The small-batch permanent magnet iron removal device for the laboratory according to claim 1, wherein the third support end cover (21) and the fourth support end cover (22) are arranged outside the third support (18) and the fourth support (19).
9. The small-batch permanent magnet iron removal device for the laboratory according to claim 5, wherein the third support end cover (21) and the fourth support end cover (22) are fixed by connecting the bolt holes on the end covers with bolts of the main support (17); an annular slide way (23) is arranged on the main support (17), the third support end cover (21) and the fourth support end cover (22) are located in the annular slide way (23), inclination angle marks are arranged on the periphery of the annular slide way, and the inclination angles of the motor speed reducer, the rotary cylinder and the sleeve as a whole can be read through pointers on the third support end cover (21) and the fourth support end cover (22).
10. The small-batch permanent-magnet iron removal device for the laboratory according to claim 1, characterized in that 4 universal wheels (31) for supporting and moving the whole device are arranged under the main support (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011580398.2A CN112705358A (en) | 2020-12-28 | 2020-12-28 | Laboratory is with small batch volume permanent magnetism deironing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011580398.2A CN112705358A (en) | 2020-12-28 | 2020-12-28 | Laboratory is with small batch volume permanent magnetism deironing device |
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| Publication Number | Publication Date |
|---|---|
| CN112705358A true CN112705358A (en) | 2021-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011580398.2A Pending CN112705358A (en) | 2020-12-28 | 2020-12-28 | Laboratory is with small batch volume permanent magnetism deironing device |
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| CN (1) | CN112705358A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115432747A (en) * | 2022-09-30 | 2022-12-06 | 格林爱科(荆门)新能源材料有限公司 | Method and equipment for reducing magnetic foreign matters of ternary precursor |
-
2020
- 2020-12-28 CN CN202011580398.2A patent/CN112705358A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115432747A (en) * | 2022-09-30 | 2022-12-06 | 格林爱科(荆门)新能源材料有限公司 | Method and equipment for reducing magnetic foreign matters of ternary precursor |
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