CN208328058U - Blast furnace imaging device with rotation function exits protective device - Google Patents
Blast furnace imaging device with rotation function exits protective device Download PDFInfo
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- CN208328058U CN208328058U CN201820741677.4U CN201820741677U CN208328058U CN 208328058 U CN208328058 U CN 208328058U CN 201820741677 U CN201820741677 U CN 201820741677U CN 208328058 U CN208328058 U CN 208328058U
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- imaging device
- blast furnace
- ball valve
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Abstract
A kind of blast furnace imaging device with rotation function exits protective device.It includes shell, cylinder, infrared imaging device, pneumatic ball valve, temperature sensor, front limit sensor, rear limit sensors, air inlet pressure sensor, cooling air pressure sensor, controller and rotating device；The utility model effect: pneumatic ball valve is only arranged in the present apparatus, therefore it can shorten the overall length of whole device, excessive space will not be thus occupied, the situation limited especially suitable for blast furnace peripheral operation space, and the difficulty of maintenance operation can be made to be greatly reduced.Each key position is equipped with detection part, therefore automated procedures are high.Infrared imaging device is circumferentially rotated in the range close to 360 degree using rotating device, therefore the overall picture being able to observe that in entire blast furnace, and every blast furnace need to only install a playscript with stage directions device, so production cost can be greatly lowered, and convenient to carry out.
Description
Technical field
The utility model belongs to the outer technical field of imaging of blast furnace red, more particularly to a kind of blast furnace with rotation function at
As equipment exits protective device.
Background technique
In blast furnace production process, in order to monitor the working condition and the condition of production in furnace in real time, need for blast furnace installation
Industrial Monitored Control System, it is general using the infrared imaging camera lens for being mounted on furnace roof, real-time continuous monitoring is carried out to situation in furnace.
Blast furnace imaging device is crossed preformed hole and is directly installed on blast furnace roof, carries out real-time continuous prison to the condition of production in furnace
Survey, on the monitor of control room can to the motion conditions of oscillating chute, the distribution situation of charge level in furnace, internal furnace charge
Seat material, situations such as the expecting that collapse are observed in real time, this has guidance to the control of conditions of blast furnace, energy saving, raising molten steel quality
Meaning.
Due to being high temperature, environment dusty, high humility in blast furnace, at the same it is there is also about the pressure of 0.2MPa in furnace and very strong
Ascending air, so camera lens is easy to be contaminated.In the case where continuous production, only holding lens cleaning does not tie ash,
It can guarantee that the image clearly of system is stablized, achieve the purpose that inner operating monitors in real time.Therefore for imaging device protection and
There is the protection of abnormal conditions (overtemperature stops the supple of gas or steam, cuts off the water) and the on-line maintenance in blast furnace continuous production process especially weighs
It wants.
High temperature imaging protective device and protection system have following two form at present:
1. plug-in type --- this structure is by imaging device protective jacket by being monitored in ball valve insertion State of Blast Furnace.It is this
Structure does not automatically exit from protective device, and the personnel that need repairing manually repair protective jacket extraction, when exception occurs in system
Or when there is overtemperature alarm, often maintenance personal has little time to extract video camera protective jacket in time to live, therefore in such case
Lower video camera or other monitoring devices and camera lens are easy to be burned out.In addition when needing on-line maintenance, due in State of Blast Furnace
Pressure is positive pressure (about 0.2MPa pressure) during maintenance personal extracts protective jacket and closes ball valve, to overcome the pressure in furnace
Also blast furnace gas to be prevented to be possible to leak outside simultaneously, therefore there is very big security risks.
2. flashboard valve type --- this structure is that Pneumatic gate valve is mounted on to imaging device protective jacket front end, when system occurs
When abnormal conditions or overtemperature alarm, slide valve is automatically closed to protect video camera (or other monitoring devices) not to be damaged.But this
There is certain limitations for kind structure, because entire protective device is installed in outside blast furnace furnace wall, video camera probe is without slotting
Enter into furnace, therefore the visual field is smaller, furnace wall aperture is larger.There is this structure also not automatically exit from protection system again, although
Pneumatic gate valve is mounted with before video camera protective jacket, and when abnormal conditions or overtemperature alarm occurs in system, slide valve can be certainly
It is dynamic to close protection video camera and camera lens, but to be nothing like ball valve sealing effect good for the sealing effect of slide valve, it is online when needing
Security hidden trouble described in the formula of being previously inserted into is equally existed when maintenance.
To solve the above-mentioned problems, one kind is disclosed in Chinese patent application the 201410557357.Xth by the applicant
" blast furnace imaging device exits protective device " submitted, Fig. 1 are that the blast furnace imaging device exits protective device structure schematic diagram.Such as
Shown in Fig. 1, the blast furnace imaging device exits shell 1, fire door 2, ball valve 3 and the cylinder 4 that protective device includes connection,
In:
The cylinder 4 includes cylinder body 41, piston 42 and piston rod 43, and the piston rod 43 is hollow structure and left end is opened
Mouthful, the right end of the piston rod 43 is connected to the piston 42, connecting rod 44, the connecting rod 44 is provided in the piston rod 43
One end be connected to the right end of the piston rod 43, the other end for installing infrared imaging device 5, be provided on the cylinder body 41
Cooling gas inlet 411 is provided with stomata 421, position corresponding with the stomata 421 on the piston rod 43 on the piston 42
Setting aperture is connected to the stomata 421 with space in the piston rod 43；
The shell 1, the fire door 2, the ball valve 3 and the cylinder 4 are set gradually from left to right and successively fixation connects
It connects, the left end opening of the shell 1, the piston rod 43 can be reduced to the right side of the ball valve 3, the piston when being fully retracted
Bar 43 protrudes into the working position for the left end for making the infrared imaging device 5 be located at the shell 1 in the shell 1 when fully extended
And the stomata 421 is made to be directed at the cooling gas inlet 411.
But find that the blast furnace imaging device exits protective device and has the following problems: in actual use
1, the device upper furnace door 2 and ball valve 3 are disposed side by side on the outside of furnace wall, when due to fire door 2 and ball valve 3 while being arranged
Volume is larger, so that the overall length of the device be made to increase, thus can occupy excessive space, this is in blast furnace peripheral operation space
It is not applicable in limited situation, and the difficulty of maintenance operation can be made to increase.
2, lack detection device on the air inlet pipeline of cylinder 4 and cooling air pipe, therefore automated procedures are low.
3, infrared imaging device 5 is fixedly mounted on connecting rod 44, therefore can only take blast furnace inner part region
The motion conditions of working condition and the condition of production, especially oscillating chute and the distribution situation of charge level cannot combine, if thinking
The overall picture in entire blast furnace is observed, at least needs installation two blast furnace imaging devices with different imaging angles in opposite to exit anti-
Protection unit, it is clear that production cost can be increased substantially in this way, and can not usually be implemented because required operating space is excessive.
4, middle layer cooling air inlet 21 is arranged on fire door 2, and the middle layer cooling air from cooling air pipe is after fire door 2
Into the inside of piston rod 43, thus fire door 2 and infrared imaging device 5 are cooled down, but the cooling air does not pass through ball valve
3, therefore cannot effectively cool down to ball valve 3.
Summary of the invention
To solve the above-mentioned problems, the purpose of this utility model is to provide a kind of, and the blast furnace imaging with rotation function is set
It is standby to exit protective device.
In order to achieve the above object, the blast furnace imaging device provided by the utility model with rotation function exits protection dress
Set including shell, cylinder, infrared imaging device, pneumatic ball valve, temperature sensor, front limit sensor, rear limit sensors, into
Air pressure force snesor, cooling air pressure sensor, controller and rotating device；Wherein shell is mounted on the preformed hole of Top of BF
Place；Pneumatic ball valve is fixed on the outer end of shell；Cylinder includes cylinder body, piston and piston rod；The left end of cylinder body is connected to Pneumatic ball
The outer end of valve, be respectively formed on the periphery of left and right ends the entry/exit stomata being connected by air inlet pipeline with gas tank and to go out/into
Stomata, and the cooling gas inlet being connected with cooling air pipe is formed on the inside line periphery of entry/exit stomata；It is living
Plug is mounted on cylinder interior in a manner of it can move along the axial cylinder, and has been radially formed to enter with cooling gas on piston
The corresponding stomata of mouth；Piston rod is hollow structure and left end is open, and right end is connect with piston, and can be in cylinder body, pneumatic ball valve
It is moved freely with enclosure interior or so；Front limit sensor and rear limit sensors are separately mounted to inside of cylinder body or so end；
Air inlet pressure sensor and cooling air pressure sensor are separately mounted on air inlet pipeline and cooling air pipe；It is rotating device, red
Outer imaging device and temperature sensor are arranged at the inside of piston rod, and wherein rotating device includes support rod, driven gear, master
Moving gear, motor, optoelectronic switch and bracket；Wherein support rod is hollow structure, and right end is connected with piston, and internal and living
Stomata beyond the Great Wall is connected；The centre bore of driven gear covers the left hand external in support rod；Optoelectronic switch is mounted on a support rod left side
End, for limiting the rotational angle of infrared imaging device；Driving gear be arranged in the side of driven gear and with driven gear phase
Engagement；Motor is fixed on outside bracket right end and output shaft is inserted in the centre bore of driving gear；The left end installation of bracket is red
Outer imaging device；Controller setting is at the scene in control cabinet, respectively with infrared imaging device, pneumatic ball valve, temperature sensor, preceding
Limit sensors, rear limit sensors, air inlet pressure sensor, cooling air pressure sensor, motor and optoelectronic switch electrical connection.
The right side of the pneumatic ball valve is additionally provided with the middle layer cooling air inlet being connected with cooling air pipe.
It further includes the report being electrically connected with the controller that the blast furnace imaging device with rotation function, which exits protective device,
Alarm device.
The controller is equipped with and is manually entered button, manual exit button, spin button and display.
Blast furnace imaging device provided by the utility model with rotation function, which exits protective device, has following beneficial effect
Fruit:
1, pneumatic ball valve is only arranged in the present apparatus, therefore can shorten the overall length of whole device, will not thus occupy
Excessive space, the situation limited especially suitable for blast furnace peripheral operation space, and the difficulty of maintenance operation can be made significantly
It reduces.
2, each key position is equipped with detection part, therefore automated procedures are high.
3, circumferentially rotate infrared imaging device in the range close to 360 degree using rotating device, therefore can
The overall picture in entire blast furnace is observed, and every blast furnace need to only install a playscript with stage directions device, so can be greatly lowered
Production cost, and it is convenient to carry out.
4, the present apparatus, which is provided simultaneously with, sweeps function, i.e., when limiting after infrared imaging device is withdrawn into, that is, apart from gas
When dynamic ball valve has a specific position, pneumatic ball valve is closed, and in the process, is come from using the Spool rotating on pneumatic ball valve
It is dynamic to clean up the dust stratification in infrared imaging device before camera lens, it eliminates special setting and sweeps equipment.
Detailed description of the invention
Fig. 1 is that a kind of blast furnace imaging device of prior art exits protective device structure schematic diagram.
Fig. 2 is that the blast furnace imaging device provided by the utility model with rotation function exits infrared imaging on protective device
Equipment enters status diagram.
Fig. 3 is that the blast furnace imaging device provided by the utility model with rotation function exits infrared imaging on protective device
Equipment exits status diagram.
Fig. 4 is that the blast furnace imaging device provided by the utility model with rotation function exits rotating device in protective device
Portion structure enlarged drawing.
Fig. 5 is that the blast furnace imaging device provided by the utility model with rotation function exits section components in protective device
Constitute block diagram.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and detailed description.It should be noted that
In the absence of conflict, the feature in embodiments herein and embodiment can be combined with each other.It is identical with prior art
Component uses identical drawing reference numeral.
As shown in Fig. 2-Fig. 5, the blast furnace imaging device provided by the utility model with rotation function exits protective device
Including shell 1, cylinder 4, infrared imaging device 5, pneumatic ball valve 6, temperature sensor 7, front limit sensor 8, rear limit sensing
Device 9, air inlet pressure sensor 10, cooling air pressure sensor 11, controller 12 and rotating device；Wherein shell 1 is mounted on height
At the preformed hole in furnace roof portion；Pneumatic ball valve 6 is fixed on the outer end of shell 1；Cylinder 4 includes cylinder body 41, piston 42 and piston rod 43；
The left end of cylinder body 41 is connected to the outer end of pneumatic ball valve 6, is respectively formed on the periphery of left and right ends through air inlet pipeline and storage
The connected entry/exit stomata of gas tank and out/air inlet, and formation and cooling on the inside line periphery of entry/exit stomata
The connected cooling gas inlet 411 of air pipe；Piston 42 is mounted in cylinder body 41 in a manner of it can move axially along cylinder body 41
Portion, and stomata 421 corresponding with cooling gas inlet 411 has been radially formed on piston 42；Piston rod 43 is hollow knot
Structure and left end are open, and right end is connect with piston 42, and can control and move freely inside cylinder body 41, pneumatic ball valve 6 and shell 1；
Front limit sensor 8 and rear limit sensors 9 are separately mounted to inside of cylinder body 41 or so end；Air inlet pressure sensor 10 and cold
But air pressure force snesor 11 is separately mounted on air inlet pipeline and cooling air pipe；Rotating device, infrared imaging device 5 and temperature
Sensor 7 is arranged at the inside of piston rod 43, wherein rotating device include support rod 13, driven gear 14, driving gear 15,
Motor 16, optoelectronic switch 17 and bracket 18；Wherein support rod 13 is hollow structure, and right end is connected with piston 42, and internal
It is connected with the stomata 421 on piston 42；The centre bore of driven gear 14 covers the left hand external in support rod 13；Optoelectronic switch 17
It is mounted on 13 left end of support rod, for limiting the rotational angle of infrared imaging device 5；Driving gear 15 is arranged in driven gear 14
Side and be meshed with driven gear 14；Motor 16 is fixed on outside 18 right end of bracket and output shaft is inserted in driving gear 15
Centre bore in；The left end of bracket 18 is installed by infrared imaging device 5；The setting of controller 12 is at the scene in control cabinet, respectively with it is red
Outer imaging device 5, pneumatic ball valve 6, temperature sensor 7, front limit sensor 8, rear limit sensors 9, air inlet pressure sensor
10, cooling air pressure sensor 11, motor 16 and optoelectronic switch 17 are electrically connected.
The right side of the pneumatic ball valve 6 is additionally provided with the middle layer cooling air inlet 61 being connected with cooling air pipe.
It further includes being electrically connected with controller 12 that the blast furnace imaging device with rotation function, which exits protective device,
Warning device.
The controller 12 is equipped with and is manually entered button, manual exit button, spin button and display.
The blast furnace imaging device provided by the utility model with rotation function is now exited protective device working principle to explain
It states as follows:
1, it is manually entered process: being pressed by operator be manually entered button on movement controller 12 first, in controller 12
Control under, first with temperature sensor 7 detect piston rod 43 inside temperature, utilize air inlet pressure sensor 10 and cool down
Air pressure force snesor 11 detects the supply gas pressure in air inlet pipeline and cooling air pipe respectively, such as without exception, controls Pneumatic ball
Valve 6 is opened, and information transmitter thereon can send an opening signal to controller 12 after pneumatic ball valve 6 fully opens, and is thereby confirmed that
Pneumatic ball valve 6 is completely open；Then it controls cooling air pipe and stops gas supply；The exhaust outlet on gas tank is opened later, at this moment
Compressed air in gas tank will be entered in the right side of cylinder body 41 by out/air inlet of 41 right end of air inlet pipeline and cylinder body
Thus portion pushes piston 42, piston rod 43, rotating device and infrared imaging device 5 to the left, proceeds to infrared imaging device 5
When the inner end of shell 1, front limit sensor 8 will issue signal to controller 12, controller 12 receive control after the signal into
Air pipe stops gas supply；The cooling gas inlet 411 on cylinder body 41 is mutually aligned with the stomata 421 on piston 42 just at this time,
Then cooling air is passed sequentially through by cooling air pipe by the cooling gas inlet 411 on cylinder body 41, the stomata 421 on piston 42
It is supplied to the inside of support rod 13, then flows into the inside of piston rod 43, thus infrared imaging device 5 and rotating device are carried out
It is cooling；Middle layer cooling air is passed through by middle layer cooling air inlet 61 by cooling air pipe simultaneously, using the cooling air to Pneumatic ball
Valve 6 is cooled down, and to prevent pneumatic ball valve 6 from damaging because of high temperature, then cooling air is flowed between shell 1 and piston rod 43
Thus gap cools down the component of piston rod 43 and its inside.Infrared imaging is finally utilized under the control of the controller 12
Equipment 5 is taken pictures, and then sends video image to controller 12, it is indoor that controller 12 sends control to by cable again
Display is simultaneously shown that such staff can observe in real time working condition and production feelings in blast furnace by the display
Condition；If want to observe the overall picture in entire blast furnace, by the spin button on movement controller 12, start under the control of the controller 12
Thus motor 16 drives driving gear 15 to rotate, since driven gear 14 is fixed, so driving gear 15 will drive
Motor 16, bracket 18 and infrared imaging device 5 rotate in a circumferential direction together, thus using infrared imaging device 5 from difference
Working condition and the condition of production in angle shot blast furnace, when motor 16 touches optoelectronic switch 17, optoelectronic switch 17 will be sent out
The number of delivering letters gives controller 12, controls motor 16 by controller 12 and stops operating, to prevent component because of bracket 18 and thereon from rotating
Angle causes the connecting wire between electric component to wind when being more than 360 degree the problem of.
2, process is exited manually: when operator needs to repair the component in the present apparatus, pressing control first
Manual exit button on device 12 is detected in air inlet pipeline using air inlet pressure sensor 10 under the control of the controller 12
Supply gas pressure, while whether detect pneumatic ball valve 6 in the open state, when confirming that pneumatic ball valve 6 is in the open state, control
Cooling air pipe stops gas supply；The exhaust outlet on gas tank is opened later, and at this moment the compressed air in gas tank will pass through air inlet
The entry/exit stomata of 41 left end of pipeline and cylinder body enters inside the left side of cylinder body 41, thus pushes piston 42, piston rod to the right
43, rotating device and infrared imaging device 5, in the process, i.e., when being limited after infrared imaging device is withdrawn into, that is, away from
When having a specific position from pneumatic ball valve 6, pneumatic ball valve 6 is closed, automatically will in the way of the rotation of 6 upper valve core of pneumatic ball valve
Dust stratification in infrared imaging device 5 before camera lens cleans up；The inside of cylinder body 41 is all returned to infrared imaging device 5
Afterwards, rear limit sensors 9 will issue signal to controller 12, and control air inlet pipeline stops supplying after controller 12 receives the signal
Gas；Information transmitter after the closing of pneumatic ball valve 6 thereon can send a shutdown signal to controller 12, thereby confirm that pneumatic ball valve 6
It has completely closed；At this moment operator with regard to openable cylinder body 41 right end and repair and operate.
3, process is exited in alarm: in present apparatus use process, under the control of the controller 12, utilizing temperature sensor 7
Temperature inside real-time detection piston rod 43, using air inlet pressure sensor 10 and cooling air pressure sensor 11 detect respectively into
Supply gas pressure in air pipe and cooling air pipe, once the temperature inside discovery piston rod 43 is more than the temperature alarming of setting
When supply gas pressure in threshold value or air inlet pipeline or cooling air pipe is lower than the pressure alarm threshold value of setting, according to above-mentioned hand
It is dynamic to exit process and automatically exit from the present apparatus, it is unique unlike without pressing manual exit button.Simultaneously using warning device into
Row alarm, to remind staff to carry out inspection and maintenance in time.
Claims (4)
1. a kind of blast furnace imaging device with rotation function exits protective device, it is characterised in that: the device includes shell
Body (1), cylinder (4), infrared imaging device (5), pneumatic ball valve (6), temperature sensor (7), front limit sensor (8), rear limit
Level sensor (9), air inlet pressure sensor (10), cooling air pressure sensor (11), controller (12) and rotating device；Wherein
Shell (1) is mounted at the preformed hole of Top of BF；Pneumatic ball valve (6) is fixed on the outer end of shell (1)；Cylinder (4) includes cylinder
Body (41), piston (42) and piston rod (43)；The left end of cylinder body (41) is connected to the outer end of pneumatic ball valve (6), left and right ends circle
It is respectively formed with the entry/exit stomata being connected by air inlet pipeline with gas tank on circumferential surface and goes out/air inlet, and close to entry/exit
The cooling gas inlet (411) being connected with cooling air pipe is formed on the inside line periphery of stomata；Piston (42) is with can
It is internal that cylinder body (41) is mounted on along the mode of cylinder body (41) axial movement, and has been radially formed on piston (42) and cooling air
The corresponding stomata (421) of body entrance (411)；Piston rod (43) is hollow structure and left end is open, and right end and piston (42) are even
It connects, and can be moved freely left and right inside cylinder body (41), pneumatic ball valve (6) and shell (1)；Front limit sensor (8) and rear limit
Level sensor (9) is separately mounted to inside of cylinder body (41) or so end；Air inlet pressure sensor (10) and cooling air pressure sensing
Device (11) is separately mounted on air inlet pipeline and cooling air pipe；Rotating device, infrared imaging device (5) and temperature sensor
(7) it is arranged at the inside of piston rod (43), wherein rotating device includes support rod (13), driven gear (14), driving gear
(15), motor (16), optoelectronic switch (17) and bracket (18)；Wherein support rod (13) is hollow structure, right end and piston (42)
It is connected, and inside is connected with the stomata (421) on piston (42)；The centre bore of driven gear (14) is covered in support rod
(13) left hand external；Optoelectronic switch (17) is mounted on support rod (13) left end, for limiting the rotation of infrared imaging device (5)
Angle；Driving gear (15) is arranged the side in driven gear (14) and is meshed with driven gear (14)；Motor (16) is fixed
Outside bracket (18) right end and output shaft is inserted in the centre bore of driving gear (15)；The left end installation of bracket (18) is infrared
Imaging device (5)；Controller (12) setting is at the scene in control cabinet, respectively with infrared imaging device (5), pneumatic ball valve (6), temperature
Spend sensor (7), front limit sensor (8), rear limit sensors (9), air inlet pressure sensor (10), cooling air pressure sensing
Device (11), motor (16) and optoelectronic switch (17) electrical connection.
2. the blast furnace imaging device according to claim 1 with rotation function exits protective device, it is characterised in that: institute
The right side for the pneumatic ball valve (6) stated is additionally provided with the middle layer cooling air inlet (61) being connected with cooling air pipe.
3. the blast furnace imaging device according to claim 1 with rotation function exits protective device, it is characterised in that: institute
It further includes the warning device being electrically connected with controller (12) that the blast furnace imaging device with rotation function stated, which exits protective device,.
4. the blast furnace imaging device according to claim 1 with rotation function exits protective device, it is characterised in that: institute
The controller (12) stated is equipped with and is manually entered button, manual exit button, spin button and display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820741677.4U CN208328058U (en) | 2018-05-18 | 2018-05-18 | Blast furnace imaging device with rotation function exits protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820741677.4U CN208328058U (en) | 2018-05-18 | 2018-05-18 | Blast furnace imaging device with rotation function exits protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208328058U true CN208328058U (en) | 2019-01-04 |
Family
ID=64774255
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820741677.4U Withdrawn - After Issue CN208328058U (en) | 2018-05-18 | 2018-05-18 | Blast furnace imaging device with rotation function exits protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208328058U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108642223A (en) * | 2018-05-18 | 2018-10-12 | 天津市三特电子有限公司 | Blast furnace imaging device with rotation function exits protective device |
-
2018
- 2018-05-18 CN CN201820741677.4U patent/CN208328058U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108642223A (en) * | 2018-05-18 | 2018-10-12 | 天津市三特电子有限公司 | Blast furnace imaging device with rotation function exits protective device |
| CN108642223B (en) * | 2018-05-18 | 2023-09-26 | 天津市三特电子有限公司 | Blast furnace imaging equipment withdrawal protection device with rotation function |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20190104 Effective date of abandoning: 20230926 |