CN112201433A - Automatic magnetizing detection device for alnico steel - Google Patents
Automatic magnetizing detection device for alnico steel Download PDFInfo
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- CN112201433A CN112201433A CN202011280745.XA CN202011280745A CN112201433A CN 112201433 A CN112201433 A CN 112201433A CN 202011280745 A CN202011280745 A CN 202011280745A CN 112201433 A CN112201433 A CN 112201433A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
- H01F13/003—Methods and devices for magnetising permanent magnets
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention discloses an automatic magnetizing detection device for alnico steel, which comprises a workbench, a magnetizing coil, a magnetism measuring coil, two groups of adjusting mechanisms, a conveying mechanism, a separating mechanism and a cleaning mechanism, wherein the magnetizing coil, the magnetism measuring coil, the two groups of adjusting mechanisms, the conveying mechanism, the separating mechanism and the cleaning mechanism are arranged on the workbench; the separating mechanism comprises a bearing beam welded on the top wall of the workbench, and a plurality of groups of lifting assemblies and separating assemblies which are arranged on the bearing beam in parallel, wherein the bearing beam is provided with an adjusting groove penetrating through the top wall of the bearing beam. This automatic detection device that magnetizes of alnico magnet steel sets up multiunit top slider through sliding in the adjustment tank to accepting the roof beam and seting up multiunit constant head tank, make the stopper on the top slider rotate along the cross axle and can block in the constant head tank of suitable position and make top slider location, make the separable set position adjust as required, separation when having adapted to different groups number magnet steel and connecting.
Description
Technical Field
The invention belongs to the technical field of alnico, and particularly relates to an automatic magnetizing detection device for alnico.
Background
The alnico magnetic steel is synthesized by aluminum, nickel and cobalt and is used for manufacturing the super-hardness permanent magnet alloy, has different metal components, different magnetic properties and different purposes, and is mainly used in the fields of various sensors, instruments, electronics, electromechanics, medical treatment, teaching, automobiles, aviation, military technology and the like. Alnico is the oldest type of magnetic steel, called natural magnet, and although it is the oldest type, its adaptability to high temperature makes it still one of the most important magnetic steels so far. Alnico can work normally at a high temperature of 500 ℃ or higher, which is the greatest characteristic of alnico, and in addition, the corrosion resistance is stronger than that of other magnets.
When the alnico is synthesized, it needs to be magnetized and tested, and the magnetizing and testing are respectively carried out in the corresponding coils. The separation mechanism on the existing device for magnetizing and measuring the magnetism of the alnico steel is not adjustable, so that the separation mechanism can not adapt to the separation when different groups of magnetic steels are connected, and the magnetic steels can be damaged due to extrusion (for positioning) and collision in the separation and magnetism measurement processes; the solid sundries attached to the surface of the magnetic steel after magnetism measurement can be removed only by secondary treatment of subsequent workers or machines, and the magnetic steel needs to be transported to other positions for operation, which is troublesome.
Disclosure of Invention
The invention aims to provide an automatic magnetizing detection device for alnico steel, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: an automatic magnetizing detection device for alnico comprises a workbench, a magnetizing coil, a magnetism measuring coil, two groups of adjusting mechanisms, a conveying mechanism, a separating mechanism and a cleaning mechanism, wherein the magnetizing coil, the magnetism measuring coil, the two groups of adjusting mechanisms, the conveying mechanism, the separating mechanism and the cleaning mechanism are arranged on the workbench;
the separating mechanism comprises a bearing beam welded on the top wall of the workbench, and a plurality of groups of lifting assemblies and separating assemblies which are arranged on the bearing beam in parallel, wherein the bearing beam is provided with an adjusting groove penetrating through the top wall of the bearing beam;
the lifting assembly comprises a top sliding block, a second electric push rod, an extension rod and a receiving block, wherein the top sliding block is arranged in the adjusting groove in a sliding mode;
the separation assembly comprises a lower sliding block welded on the side wall of the extension rod, a screw rod penetrating through two sides of the lower sliding block and in threaded connection with the lower sliding block, an upper sliding block penetrated through threads of the screw rod and a separation block, the upper sliding block is fixedly connected with the separation block through a connecting rod, and the top wall of the screw rod is rotatably connected with the top sliding block; and electromagnetic coils are arranged in the separating block and the receiving block.
Preferably, each group of adjusting mechanisms comprises a rotating shaft connected with the workbench in a rotating mode, a bearing plate welded with the outer wall of the rotating shaft and a first electric push rod arranged in the containing groove, guide shafts are arranged at two ends of the first electric push rod, the first electric push rod is in transmission connection with the bearing plate through a group of guide shafts on the first electric push rod, the first electric push rod is in transmission connection with the workbench through another group of guide shafts on the first electric push rod, and the magnetizing coil and the magnetism measuring coil are arranged on the bearing plates of the two groups of adjusting mechanisms respectively.
Preferably, conveying mechanism is at least including offering the conveyer trough at the workstation roof, the conveyer belt in the conveyer trough and welding the first motor at the mounting groove inside wall that the workstation roof was seted up, still is equipped with in the conveyer trough to be located the inboard both sides of conveyer belt and with conveyer trough inside wall rotation set up driving shaft and driven shaft.
Preferably, the first motor crankshaft penetrates through the workbench and is coaxially connected with one end of the driving shaft, and two groups of side plates are symmetrically welded at the position, above the conveying groove, of the top wall of the workbench.
Preferably, the top wall of the bearing beam is further provided with a plurality of groups of positioning grooves which are arranged at equal intervals in the horizontal direction, each group of positioning grooves is formed in the side, close to the magnetizing coil, of the top sliding block, a limiting block is connected to the side, close to the magnetizing coil, of the top sliding block in a rotating mode through a group of cross shafts, and the limiting block is clamped with the positioning grooves.
Preferably, the cleaning mechanism comprises a conical hopper, a fixed seat and a transmission assembly, wherein the fixed seat is welded to the bottom end of the conical hopper, a feed inlet communicated with the conical hopper is formed in the top wall of the fixed seat, and a discharge outlet penetrating through the bottom wall of the workbench is formed in one side of the bottom wall of the fixed seat.
Preferably, the transmission assembly comprises a second motor welded on the bottom wall of the workbench, a transmission shaft coaxially connected with a crankshaft at the top end of the second motor, and a rotating seat welded on the top end of the transmission shaft, the top wall of the rotating seat is provided with a clamping groove, and the track of the clamping groove rotating along with the rotating seat is a running track.
The invention has the technical effects and advantages that: the automatic magnetizing detection device for the alnico magnet steel is characterized in that a plurality of groups of top sliders are arranged in the adjusting grooves in a sliding manner, and a plurality of groups of positioning grooves are formed in the top wall of the bearing beam, so that the limiting blocks on the top sliders can be clamped in the positioning grooves at proper positions and can position the top sliders by rotating along the transverse shaft, the position of the separating component can be adjusted as required, the separation is adapted to the separation when different groups of magnet steel are connected, when the magnet steel on the receiving blocks needs to be discharged, the magnet steel between the adjacent receiving blocks is connected with the magnet steel on the receiving blocks through magnetic force due to the action of the magnetic force, then the second electric push rod is contracted to drive the magnet steel group to move upwards, the electromagnetic coils on the receiving blocks and the separating blocks are in a working state, the screw rod is driven to rotate along with the upward movement of the receiving blocks, the upper sliders are driven to move downwards, the adjacent magnetic steels can be separated by sequentially powering off the electromagnetic coils, and the magnetic steels are not extruded and collided in the processes of receiving and pushing out the magnetic steels, so that the magnetic steels are prevented from being damaged when being separated; through having set up clearance mechanism, the magnet steel after the separation accomplishes earlier the roll to the toper fill after surveying the magnetism in surveying the magnetic coil, the magnet steel is fought the whereabouts and just in time falls to the fixing base inside from the feed inlet along the toper, and with rotate the cooperation of draw-in groove on the seat, then the second motor starts to drive and rotates the seat and rotate, thereby it rotates around the fixing base center to drive the magnet steel through the draw-in groove, the magnet steel is under the effect of draw-in groove around the center pivoted simultaneously with the rubber pad friction then the rotation of fixing base with the rotation seat lateral wall, realize cleaning to magnet steel both ends face and side through the rotation, the trouble of secondary treatment magnet steel has been removed from, and do not need manual operation.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a vertical cross-sectional view taken along A-A of the upper table portion of FIG. 1 in accordance with the present invention;
FIG. 3 is a schematic structural view of the bearing beam of the present invention;
FIG. 4 is a vertical cross-sectional view of the lift assembly and disengagement assembly of the present invention;
FIG. 5 is a vertical cross-sectional view taken along the line A-A of the holder of FIG. 1 in accordance with the present invention;
fig. 6 is a transverse sectional view of the holder of the present invention.
In the figure: 1. a work table; 2. a magnetizing coil; 3. a magnetic measurement coil; 4. a rotating shaft; 5. a bearing plate; 6. a first electric push rod; 7. a guide shaft; 8. a first motor; 9. a drive shaft; 10. a driven shaft; 11. a bearing beam; 12. an adjustment groove; 13. a top slide block; 14. a second electric push rod; 15. an extension pole; 16. receiving a block; 17. a lower slide block; 18. a screw rod; 19. an upper slide block; 20. separating the blocks; 21. a connecting rod; 22. a side plate; 23. a conical hopper; 24. a fixed seat; 25. a feed inlet; 26. running the track; 27. a card slot; 28. a discharge port; 29. a second motor; 30. a rotating seat, a 31 positioning groove and a 32 limiting block.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides an automatic magnetizing detection device for alnico steel as shown in fig. 1-6, which comprises a workbench, a magnetizing coil, a magnetism measuring coil, two groups of adjusting mechanisms, a conveying mechanism, a separating mechanism and a cleaning mechanism, wherein the magnetizing coil, the magnetism measuring coil, the two groups of adjusting mechanisms, the conveying mechanism, the separating mechanism and the cleaning mechanism are arranged on the workbench;
the separating mechanism comprises a bearing beam 11 welded on the top wall of the workbench 1 and a plurality of groups of lifting assemblies and separating assemblies which are arranged on the bearing beam 11 in parallel, and an adjusting groove 12 penetrating through the top wall of the bearing beam 11 is formed in the bearing beam 11;
the lifting assembly comprises a top sliding block 13 arranged in the adjusting groove 12 in a sliding mode, a second electric push rod 14 arranged on the bottom wall of the top sliding block 13, an extension rod 15 welded at the bottom end of the second electric push rod 14 and a receiving block 16 welded at the bottom end of the extension rod 15, one side of the receiving block 16 is of a square structure, the other side of the receiving block extends to one side close to the magnetizing coil 2, the top of the side is provided with an inclined plane, and the magnetic steel can conveniently move to the receiving block 16;
the separating assembly comprises a lower sliding block 17 welded on the side wall of the extension rod 15, a screw rod 18 penetrating through two sides of the lower sliding block 17 and in threaded connection with the lower sliding block, an upper sliding block 19 penetrated through threads of the screw rod 18 and a separating block 20, the upper sliding block 19 and the separating block 20 are fixedly connected through a connecting rod 21, and the top wall of the screw rod 18 is rotatably connected with the top sliding block 13; the separating block 20 and the receiving block 16 are provided with electromagnetic coils inside.
Concretely, every adjustment mechanism of group all includes and rotates pivot 4 of being connected, accept board 5 and establish the first electric putter 6 at accomodating the inslot with 4 outer wall welded of pivot with workstation 1, and all installs guiding axle 7 at 6 both ends of first electric putter, first electric putter 6 is connected with accepting 5 transmissions of board through a set of guiding axle 7 on it, and first electric putter 6 is connected with 1 transmissions of workstation through another group guiding axle 7 on it, magnetizing coil 2 and magnetic coil 3 are installed respectively on two sets of adjustment mechanism's accepting board 5.
Specifically, conveying mechanism is at least including offering the conveyer belt in the conveyer trough, the conveyer trough of 1 roof of workstation and welding the first motor 8 at the mounting groove inside wall that the 1 roof of workstation was offered, still is equipped with in the conveyer trough to be located the inboard both sides of conveyer belt and with conveyer trough inside wall rotate the driving shaft 9 and the driven shaft 10 that set up.
Specifically, the crankshaft of the first motor 8 penetrates through the workbench 1 and is coaxially connected with one end of the driving shaft 9, two groups of side plates 22 are symmetrically welded to the position, located above the conveying groove, of the top wall of the workbench 1, and the two groups of side plates 22 are arranged to ensure that the magnetic steel group just corresponds to the receiving block 16 when moving to the separating mechanism along with the conveying mechanism.
Specifically, the top wall of the bearing beam 11 is further provided with a plurality of groups of positioning grooves 31 which are arranged at equal intervals in the horizontal direction, each group of positioning grooves is formed in the side, close to the magnetizing coil 2, of the top sliding block 13, a limiting block 32 is connected to the side, close to the magnetizing coil 2, of the top sliding block in a rotating mode through a group of cross shafts, and the limiting block 32 is clamped with the positioning grooves 31.
Specifically, the cleaning mechanism comprises a conical hopper 23, a fixed seat 24 welded with the bottom end of the conical hopper 23 and a transmission assembly, wherein a feed inlet 25 communicated with the conical hopper 23 is formed in the top wall of the fixed seat 24, and a discharge outlet 28 penetrating through the bottom wall of the workbench 1 is formed in one side of the bottom wall of the fixed seat 24.
Specifically, the transmission assembly includes the second motor 29 of welding at the 1 diapire of workstation, with a transmission shaft and the rotation seat 30 of welding on this transmission shaft top of the spindle coaxial coupling on second motor 29 top, it has draw-in groove 27 to rotate the top wall of seat 30, and draw-in groove 27 is orbit 26 along with rotating the pivoted orbit of seat 30, and the rubber pad has all been fixed to bond with rotating the seat 30 lateral wall in the fixing base 24 inside wall.
The using method comprises the following steps: when the automatic magnetizing detection device for the alnico magnetic steel is used, firstly, an adjusting mechanism below a magnetizing coil 2 is driven to work, a first electric push rod 6 is extended to drive a bearing plate 5 to overturn to a proper angle along a rotating shaft 4, the magnetizing coil 2 is driven to overturn and incline, a plurality of groups of weak magnetic steel are connected into a whole and sent into the magnetizing coil 2, the arrangement mode of the plurality of groups of magnetic steel is limited to the arrangement of attraction of the end parts of a cylindrical magnetizing coil 2, the plurality of groups of magnetic steel are symmetrically distributed at the bottom of the inner wall of the magnetizing coil, the magnetizing of the magnetic steel is realized after the plurality of groups of magnetic steel pass through the magnetizing coil 2, and the magnetic steel output from the magnetizing coil 2 has strong magnetism;
the magnetic steel is output from the magnetizing coil 2 and then falls on a conveying belt of the conveying mechanism, a first motor 8 is driven to work to drive a driving shaft 9 to rotate, a driven shaft 10 and the conveying belt move towards one side close to the magnetism measuring coil 3, a plurality of groups of magnetic steel are horizontally arranged and correspond to the multi-group separating assemblies respectively, a plurality of groups of top sliding blocks 13 respectively slide to proper positions in an adjusting groove 12 (the top sliding blocks are adjusted according to the size of the magnetic steel, each group of receiving blocks 16 can receive the magnetic steel), a transverse shaft on each group of top sliding blocks 13 is overturned, a limiting block 32 is driven to overturn, and the limiting block 32 is clamped in the corresponding positioning groove 31 (more groups of positioning grooves 31 can be arranged according to needs);
the plurality of groups of second electric push rods 14 are driven to extend and drive the receiving blocks 16 to be close to the conveying belt, the magnetic steel group running on the conveying belt can run simultaneously under the action of the side plates 22 and respectively move to the plurality of groups of receiving blocks 16 from the inclined surfaces of the plurality of groups of receiving blocks 16, when the magnetic steel group moves to the receiving blocks 16, the magnetic steel between the adjacent receiving blocks 16 is connected with the magnetic steel positioned on the receiving blocks 16 through magnetic force due to the action of the magnetic force, then the plurality of groups of second electric push rods 14 contract simultaneously to drive the magnetic steel group to move upwards, at the moment, the electromagnetic coils on the receiving blocks 16 and the separating blocks 20 are in a working state, and along with the upward movement of the receiving blocks 16, the lead screw 18 is driven to rotate, the upper slide block 19 is driven to move downwards, namely, the separating block 20 is driven to move downwards, so that the magnetic steel between the adjacent receiving blocks 16 is, the next process of the separated magnetic steel can be independently carried out;
the separated first group of magnetic steel (any one of the magnetic steel groups) is pushed to a conveying belt, the first group of magnetic steel is conveyed into a magnetic measurement coil 3 to be measured in a matching manner with the operation of the conveying belt, and then the third, fifth, second and fourth groups of magnetic steel are pushed out and measured;
when the separated magnetic steel finishes magnetic measurement in a magnetic measurement coil and then rolls down to the conical hopper 23, the magnetic steel is in a vertical state in the process of falling along the conical hopper 23, the magnetic steel just falls into the fixed seat 24 from the feed port 25 and is matched with the clamping groove 27 on the rotating seat 30, then the second motor 29 is started to drive the rotating seat 30 to rotate, so that the magnetic steel is driven to rotate around the center of the fixed seat 24 through the clamping groove 27, the rubber pads arranged on the fixed seat 24 and the rotating seat 30 ensure that the magnetic steel rotates around the center under the action of the clamping groove 27 and rubs with the rubber pads and then rotates, the two end faces and the side faces of the magnetic steel are wiped through rotation, when the clamping groove 27 drives the magnetic steel to move to the position of the discharge port 28, the magnetic steel falls from the discharge port 28, and then the clamping groove 27 continues to rotate to the.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (7)
1. The utility model provides an automatic detection device that magnetizes of alnico magnet steel, includes magnetizing coil (2), survey magnetism coil (3), two sets of adjustment mechanism, conveying mechanism, separating mechanism and clearance mechanism on workstation (1), its characterized in that: the two groups of adjusting mechanisms are respectively positioned in the two groups of accommodating grooves formed in the two sides of the top wall of the workbench (1), and the separating mechanism is positioned above the conveying mechanism;
the separating mechanism comprises a bearing beam (11) welded on the top wall of the workbench (1) and a plurality of groups of lifting assemblies and separating assemblies which are arranged on the bearing beam (11) in parallel, and an adjusting groove (12) penetrating through the top wall of the bearing beam (11) is formed in the bearing beam (11);
the lifting assembly comprises a top sliding block (13) arranged in the adjusting groove (12) in a sliding mode, a second electric push rod (14) installed on the bottom wall of the top sliding block (13), an extension rod (15) welded at the bottom end of the second electric push rod (14) and a receiving block (16) welded at the bottom end of the extension rod (15);
the separating assembly comprises a lower sliding block (17) welded on the side wall of the extension rod (15), a screw rod (18) penetrating through two sides of the lower sliding block (17) and connected with the screw rod in a threaded manner, an upper sliding block (19) penetrated by the screw rod (18) in a threaded manner and a separating block (20), the upper sliding block (19) and the separating block (20) are fixedly connected through a connecting rod (21), the top wall of the screw rod (18) is rotatably connected with a top sliding block (13), and electromagnetic coils are arranged inside the separating block (20) and a receiving block (16).
2. The device of claim 1, wherein the device comprises: every group adjustment mechanism all includes and rotates pivot (4) of being connected with workstation (1), accepts board (5) and establishes first electric putter (6) at accomodating the inslot with pivot (4) outer wall welded, and all installs guiding axle (7) at first electric putter (6) both ends, first electric putter (6) are connected with accepting board (5) transmission through a set of guiding axle (7) on it, and first electric putter (6) are connected with workstation (1) transmission through another set of guiding axle (7) on it, fill magnetism coil (2) and survey magnetism coil (3) and install respectively on two sets of adjustment mechanism's accepting board (5).
3. The device of claim 1, wherein the device comprises: conveying mechanism is at least including offering conveyer trough, the conveyer belt in the conveyer trough at workstation (1) roof and welding first motor (8) at the mounting groove inside wall that workstation (1) roof was seted up, still is equipped with in the conveyer trough and is located the inboard both sides of conveyer belt and rotates driving shaft (9) and driven shaft (10) that set up with the conveyer trough inside wall.
4. The device of claim 3, wherein the device comprises: a crankshaft of the first motor (8) penetrates through the workbench (1) and is coaxially connected with one end of the driving shaft (9), and two groups of side plates (22) are symmetrically welded at the position, above the conveying groove, of the top wall of the workbench (1).
5. The device of claim 1, wherein the device comprises: the bearing beam (11) top wall is also provided with a plurality of groups of positioning grooves (31) which are arranged at equal intervals in the horizontal direction, each group of positioning grooves is formed in the side, close to the magnetizing coil (2), of the top sliding block (13) and is connected with a limiting block (32) in a rotating mode through a group of cross shafts, and the limiting block (32) is clamped with the positioning grooves (31).
6. The device of claim 1, wherein the device comprises: the cleaning mechanism comprises a conical hopper (23), a fixed seat (24) and a transmission assembly, wherein the fixed seat (24) is welded to the bottom end of the conical hopper (23), a feeding hole (25) communicated with the conical hopper (23) is formed in the top wall of the fixed seat (24), and a discharging hole (28) penetrating through the bottom wall of the workbench (1) is formed in one side of the bottom wall of the fixed seat (24).
7. The device of claim 6, wherein the device comprises: the transmission assembly comprises a second motor (29) welded on the bottom wall of the workbench (1), a transmission shaft coaxially connected with a crankshaft on the top end of the second motor (29) and a rotating seat (30) welded on the top end of the transmission shaft, a clamping groove (27) is formed in the top wall of the rotating seat (30), and the track of the clamping groove (27) rotating along with the rotating seat (30) is a running track (26).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011280745.XA CN112201433B (en) | 2020-11-16 | 2020-11-16 | Automatic magnetizing detection device for alnico steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011280745.XA CN112201433B (en) | 2020-11-16 | 2020-11-16 | Automatic magnetizing detection device for alnico steel |
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| CN112201433A true CN112201433A (en) | 2021-01-08 |
| CN112201433B CN112201433B (en) | 2022-09-30 |
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| CN202011280745.XA Active CN112201433B (en) | 2020-11-16 | 2020-11-16 | Automatic magnetizing detection device for alnico steel |
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| CN208033083U (en) * | 2018-02-02 | 2018-11-02 | 福建中研机电科技有限公司 | A kind of permanent magnetic steel is automatically separated detection device |
| CN211505771U (en) * | 2019-12-20 | 2020-09-15 | 杭州美磁科技有限公司 | Detection mechanism of automatic magnetic steel magnetizer |
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| US6556412B1 (en) * | 1998-11-12 | 2003-04-29 | Lg Electronics Inc. | Degaussing apparatus and method for rotatable video display apparatus |
| US20050243461A1 (en) * | 2004-04-28 | 2005-11-03 | Hitachi Global Storage Technologies Netherlands B.V. | Data erasure apparatus, data erasure method and method for writing servo patterns on recording disk |
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| CN112201433B (en) | 2022-09-30 |
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