CN113027523B - Mining drainage equipment with intelligent detection system - Google Patents
Mining drainage equipment with intelligent detection system Download PDFInfo
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- CN113027523B CN113027523B CN202110426056.3A CN202110426056A CN113027523B CN 113027523 B CN113027523 B CN 113027523B CN 202110426056 A CN202110426056 A CN 202110426056A CN 113027523 B CN113027523 B CN 113027523B
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- 238000001514 detection method Methods 0.000 title claims abstract description 75
- 238000005065 mining Methods 0.000 title claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 106
- 230000007246 mechanism Effects 0.000 claims abstract description 54
- 238000005086 pumping Methods 0.000 claims abstract description 32
- 238000012545 processing Methods 0.000 claims description 20
- 238000004891 communication Methods 0.000 claims description 11
- 230000003028 elevating effect Effects 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 description 13
- 239000002699 waste material Substances 0.000 description 6
- 238000012806 monitoring device Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
The invention discloses a mine drainage device with an intelligent detection system, which comprises a movable base, wherein an advancing mechanism is arranged on the movable base, a lifting mechanism is arranged on the advancing mechanism, an outwards extending detection supporting rod is arranged on the lifting mechanism, a detection shaft is downwards arranged on the detection supporting rod, a detection ring is sleeved outside the detection shaft, a telescopic mechanism is downwards arranged at the lower end of the detection shaft, one side of a water depth detection plate is connected with a water pumping device fixing plate, a plurality of water pumping mechanisms are uniformly distributed on the water pumping device fixing plate along the axis direction of the detection shaft.
Description
Technical Field
The invention relates to mining drainage pump equipment, in particular to mining drainage equipment with an intelligent detection system.
Background
The mining drainage pump is used as a modern engineering machine and is widely applied to railway tunnels, highway tunnels, mine excavation, water conservancy and underground engineering. The intelligent multi-stage mine drainage pump has very important significance in preventing mine water burst and guaranteeing mine drainage safety, so that a mine drainage system is safer, and the drainage efficiency is greatly improved. With the continuous improvement of requirements of safe construction and efficient construction, drainage pump technology at home and abroad is continuously iteratively upgraded. In underground construction, the mining drainage pump plays an increasingly large role, and for practical engineering, the existing drainage pump cannot predict the water level of a drainage ditch or is inaccurate in prediction, so that certain defects exist in preventing water burst accidents under a mine; in addition, the existing part of drainage pumps cannot conduct classified drainage, and the corresponding number of water pumps cannot be reasonably opened according to the water level of the drainage ditch, so that resource waste is caused, the economic benefit of a mine is damaged, and the energy waste does not accord with the environment-friendly concept of green construction and sustainable development; the device is complex and inconvenient to install due to the fact that the part of the multi-stage drainage pump is not skilled in installation or use of the drainage pump by workers, and potential safety hazards are caused.
Accordingly, there is a need for further improvements in existing mining drain pump apparatus.
Disclosure of Invention
The invention aims to provide the mining drainage equipment with the intelligent detection system, which can quickly erect drainage pump equipment, is more intelligent, can quickly detect the current water level, and can start a corresponding water pump at the horizontal height, so that the resources are saved, and the mine construction cost is reduced.
In order to achieve the above purpose, the present invention adopts the following scheme:
the utility model provides a possess mining drainage equipment of intelligent detection system, includes the removal base, be provided with the mechanism that advances on the removal base, be provided with elevating system on the mechanism that advances, be provided with the outside detection bracing piece that extends on the elevating system, be provided with the detection axle down on the detection bracing piece, the detection axle overcoat is equipped with the detection ring, the detection axle lower extreme is provided with telescopic machanism down, telescopic machanism below output is provided with the depth of water pick-up plate, be provided with on the depth of water pick-up plate towards the distance detection device that the detection ring direction set up, depth of water pick-up plate one side is connected with the pumping device fixed plate, follow on the pumping device fixed plate the axis direction equipartition of detection axle has a plurality of pumping mechanisms, a plurality of respectively is connected with classification switch on the pumping mechanism, be provided with data processing controller on the removal base, distance detection device communication connect in data processing controller communication respectively connect in a plurality of classification switch.
Further, the movable base comprises a movable bottom plate, and a plurality of movable wheels are arranged on the movable bottom plate.
Further, the advancing mechanism comprises a longitudinal electric sliding rail arranged on the movable base, and a sliding supporting plate is movably arranged on the electric sliding rail.
Further, the lifting mechanism comprises a plurality of guide rods vertically arranged on the upper surface of the sliding support plate, a moving part movably arranged above the sliding support plate, a plurality of guide holes matched with the guide rods are formed in the moving part, a connecting top plate is arranged at the upper end of each guide rod, a driving screw rod is vertically arranged on the sliding support plate, a screw hole is formed in the moving part, and the driving screw rod penetrates through the screw hole and is in threaded connection with the screw hole.
Further, the water pumping mechanism comprises a water inlet arranged on the fixing plate of the water pumping device, a water pump arranged on the movable base, and a water pipe communicated between the inlet end of the water pump and the water inlet.
Further, the water pump is provided with a water outlet end, the movable base is provided with an output water main, and the water outlet ends are respectively communicated with the output water main.
Further, the step switch is an electromagnetic valve, the distance detection device is a laser measuring instrument, and the data processing controller is editable and controllable.
Further, a flow calculation module is arranged on the output total water pipe, and the flow calculation module is in communication connection with the display terminal.
Further, the mobile base is provided with a monitoring device, and the monitoring device is in communication connection with the display terminal.
Further, a GPS positioning device for positioning the current equipment position is arranged on the mobile base; the mobile base is provided with a signal transmitting device, and the data processing controller is connected with the signal transmitting device in a communication mode.
In summary, compared with the prior art, the invention has the following beneficial effects:
the invention solves the defects existing in the existing mine drainage system, has the advantages of being capable of rapidly erecting drainage equipment, saving working time and labor force, simultaneously, being capable of intelligently and hierarchically pumping water according to water level in the mine drainage system, greatly saving resources, reducing unnecessary electric energy waste, having simple structure, being convenient to install, being easier to use, being rapidly adapted to be erected according to the depth of a ditch, and reducing the danger existing in manual erection.
Drawings
FIG. 1 is one of the perspective views of the present invention;
FIG. 2 is a second perspective view of the present invention;
FIG. 3 is one of the erection schematics of the present invention;
FIG. 4 is a second diagram of the present invention;
FIG. 5 is a top view of the present invention;
fig. 6 is a front view of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to FIGS. 1-6, the present invention provides
The mining drainage equipment with the intelligent detection system comprises a movable base 1, wherein an advancing mechanism 2 is arranged on the movable base 1, a lifting mechanism 3 is arranged on the advancing mechanism 2, a detection supporting rod 4 which extends outwards is arranged on the lifting mechanism 3, a detection shaft 5 is arranged on the detection supporting rod 4 downwards, a detection ring 6 is sleeved outside the detection shaft 5, a telescopic mechanism 7 is arranged at the lower end of the detection shaft 5 downwards, a water depth detection plate 8 is arranged at the output end below the telescopic mechanism 7, a distance detection device 9 which is arranged towards the direction of the detection ring 6 is arranged on the water depth detection plate 8, a water pumping device fixing plate 10 is connected to one side of the water depth detection plate 8, a plurality of water pumping mechanisms 11 are uniformly distributed on the water pumping device fixing plate 10 along the axial direction of the detection shaft 5, a plurality of classification switches 12 are respectively connected to the water pumping mechanisms 11, a data processing controller 13 is arranged on the movable base 1, and the distance detection device 9 is in communication connection with the data processing controller 13;
erecting and moving:
when in erection, the lifting mechanism 3 is driven to move forwards by controlling the advancing mechanism 2, so that the lifting mechanism 3 moves to the upper part of the ditch, at the moment, the lifting mechanism 3 is started, and the lifting mechanism 3 drives the distance detection device 9 to descend to the bottom of the ditch, so that the early erection is completed;
when the equipment moves, the lifting mechanism 3 drives the distance detection device 9 to ascend and reset, and meanwhile, the advancing mechanism 2 drives the lifting mechanism 3 to move backwards and reset, so that the storage work is completed, and the movable base 1 can be controlled to change the position.
Detection principle:
the distance detection device 9 moves to the bottom of the lifting mechanism 3, the detection ring 6 has buoyancy, the density is smaller than that of water, the detection ring 6 floats on the water surface, the distance detection device 9 emits signals towards the lower surface of the detection ring 6, the distance between the current detection ring and the detection ring 6 is detected, the detected information is sent to the data processing controller 13, the data processing controller 13 converts the detected information into corresponding parameters according to the proportion, each water pumping mechanism 11 has different parameter ranges, when the converted parameters exceed the parameter ranges of the corresponding water pumping mechanisms 11 at the corresponding positions, the corresponding water pumping mechanism 11 is provided with a grading switch 12 which is opened, and the corresponding water pumping mechanism 11 is subjected to water pumping work after the grading switch 12 is opened; the higher the water level, the greater the number of pump mechanisms 11 that are opened from bottom to top.
The method can also comprise the following steps:
the first step: the drainage pump is arranged in the mine drainage ditch, and whether the equipment operates normally or not is checked, whether the distance detection device 9 measures accurately or not, whether the data processing controller 13 fails or not, whether the intelligent classification switch is normally opened or closed or not, and whether the water pump operates normally or not is checked.
And a second step of: after checking, the industrial power supply is turned on to start operation, and the distance detection device 9 measures the water level of the drainage ditch, and the data processing controller 13 starts to calculate the water level h.
And a third step of: when the water level H calculated by the data processing controller 13 reaches one fourth of the height H of the drainage ditch, namely h=1/4H, the classification switch 12 corresponding to the water level is opened, so that the water pumping mechanism 11 corresponding to the water level starts to work, and when the water level H is lower than 1/4H, the classification switch 12 is closed.
Fourth step: when the water level H calculated by the data processing controller 13 reaches half of the height H of the drainage ditch, namely h=1/2H, the classification switch 12 corresponding to the water level is opened, so that the water pumping mechanism 11 corresponding to the water level starts to work, and when the water level H is lower than 1/2H, the classification switch 12 is closed, and at the moment, the water pumping mechanism 11 still works.
Fifth step: when the water level H calculated by the data processing controller 13 reaches three fourths of the height H of the drainage ditch, namely h=3/4H, the classification switch 12 corresponding to the water level is opened, so that the water pumping mechanism 11 corresponding to the water level starts to work;
sixth step: when the water level H calculated by the data processing controller 13 reaches three fourths of the height H of the drainage ditch, namely h=3/4H, the intelligent pre-warning device 120 sounds, the GPS positioning device determines the drainage pump position, and the 5G mine intelligent signal system feeds back the real-time water level H to the control room in an alarm mode and sends the drainage pump position.
Sixth step: the control room can remotely control the working operation of the drainage pump through the 5G mine intelligent signal system.
The mobile base 1 of the present invention comprises a mobile base plate 101, and a plurality of mobile wheels 102 are disposed on the mobile base plate 101.
The advancing mechanism 2 of the present invention comprises a longitudinal electric sliding rail 201 disposed on the moving base 1, and a sliding support plate 202 is movably disposed on the electric sliding rail 201.
The lifting mechanism 3 comprises a plurality of guide rods 301 vertically arranged on the upper surface of the sliding support plate 202, a moving part 302 movably arranged above the sliding support plate 202, a plurality of guide holes matched with the guide rods 301 are formed in the moving part 302, a connecting top plate 303 is arranged at the upper ends of the guide rods 301, a driving screw rod 304 is vertically arranged on the sliding support plate 202, a screw hole 305 is formed in the moving part 302, and the driving screw rod 304 penetrates through the screw hole 305 and is in threaded connection with the screw hole 305.
The water pumping mechanism 11 comprises a water inlet 111 arranged on the water pumping device fixing plate 10, a water pump 112 arranged on the movable base 1, and a water pipe 113 communicated between the inlet end of the water pump 112 and the water inlet 111.
In the present invention, the water pump 112 is provided with a water outlet 200, the mobile base 1 is provided with an output water main 100, and a plurality of water outlets 200 are respectively connected with the output water main 100.
The step switch 12 is an electromagnetic valve, the distance detection device 9 is a laser measuring instrument, and the data processing controller 13 is editable and controllable.
The output total water pipe 100 is provided with a flow calculation module 300, and the flow calculation module 300 is in communication connection with a display terminal;
the display terminal is used for displaying the numerical value of the total water flow of the output total water pipe 100 calculated by the flow calculation module 300.
The mobile base 1 is provided with a monitoring device 400, and the monitoring device 400 is in communication connection with a display terminal;
the monitoring device 400 facilitates detection of the current status of the mine.
The mobile base 1 is provided with a GPS positioning device for positioning the current equipment position; the mobile base 1 is provided with a signal transmitting device, and the data processing controller 13 is connected with the signal transmitting device in a communication way;
each of the driving motor, the elevating mechanism 3, the telescopic mechanism 7, and the water pump 112 is provided with an electrostatic device 199 for eliminating sound.
The mining drainage pump is used as a modern engineering machine and is widely applied to railway tunnels, highway tunnels, mine excavation, water conservancy and underground engineering. The intelligent multi-stage mine drainage pump has very important significance in preventing mine water burst and guaranteeing mine drainage safety, so that a mine drainage system is safer, and the drainage efficiency is greatly improved. With the continuous improvement of requirements of safe construction and efficient construction, drainage pump technology at home and abroad is continuously iteratively upgraded. In underground construction, mining drainage pumps play an increasing role.
For practical engineering, the existing drainage pump cannot predict the water level of a drainage ditch or is inaccurate in prediction, and certain defects exist in preventing water burst accidents under a mine; in addition, the existing part of drainage pumps cannot conduct classified drainage, and the corresponding number of water pumps cannot be reasonably opened according to the water level of the drainage ditch, so that resource waste is caused, the economic benefit of a mine is damaged, and the energy waste does not accord with the environment-friendly concept of green construction and sustainable development; the multistage drain pump of part, the device is more complicated, the installation is inconvenient, leads to the workman to the drain pump installation or use unskilled, cause the potential safety hazard, and can't carry out remote control, intelligent early warning, when leading to the emergence of water burst accident, can't discover the accident source in the first time, leads to missing best remedy opportunity.
The construction requirement is fully considered, the measuring instrument is utilized, the accurate measurement of the water level is realized, the intelligent classified pumping and intelligent early warning are realized, the energy waste is saved, the efficiency and the safety of a drainage system are improved, and the mine water burst accident is reduced through the data processor and the intelligent classification switch.
Meanwhile, the construction method has the characteristics of intelligent, unmanned and environment-friendly construction, meets the national sustainable development requirement, has important practical significance for unmanned, intelligent and environment-friendly construction of mine engineering and tunnel engineering, and has great development prospect at home and abroad
While there has been shown and described what is at present considered to be the fundamental principles and the main features of the invention and the advantages thereof, it will be understood by those skilled in the art that the present invention is not limited to the foregoing embodiments, but is described in the foregoing description merely illustrates the principles of the invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention as hereinafter claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. Mining drainage equipment that possesses intelligent detection system, including removing base (1), its characterized in that: the mobile base (1) is provided with an advancing mechanism (2), the advancing mechanism (2) is provided with a lifting mechanism (3), the lifting mechanism (3) is provided with an outwards extending detection support rod (4), the detection support rod (4) is provided with a detection shaft (5) downwards, a detection ring (6) is sleeved outside the detection shaft (5), the lower end of the detection shaft (5) is provided with a telescopic mechanism (7) downwards, the lower output end of the telescopic mechanism (7) is provided with a water depth detection plate (8), the water depth detection plate (8) is provided with a distance detection device (9) arranged towards the detection ring (6), one side of the water depth detection plate (8) is connected with a pumping device fixing plate (10), a plurality of pumping mechanisms (11) are uniformly distributed on the pumping device fixing plate (10) in the axis direction of the detection shaft (5), a plurality of pumping mechanisms (11) are respectively connected with a classification switch (12), the mobile base (1) is provided with a data processing controller (13), and the data processing controller (13) is connected with the data processing controller (13).
2. The mining drainage device with an intelligent detection system according to claim 1, wherein: the movable base (1) comprises a movable bottom plate (101), and a plurality of movable wheels (102) are arranged on the movable bottom plate (101).
3. The mining drainage device with an intelligent detection system according to claim 1, wherein: the advancing mechanism (2) comprises a longitudinal electric sliding rail (201) arranged on the movable base (1), and a sliding supporting plate (202) is movably arranged on the electric sliding rail (201).
4. A mining drainage device with an intelligent detection system according to claim 3, wherein: elevating system (3) are in including vertical setting a plurality of guide bars (301) of slip backup pad (202) upper surface, the activity sets up remove portion (302) of slip backup pad (202) top, be provided with a plurality of on remove portion (302) with guide bar (301) matched with guiding hole, a plurality of guide bar (301) upper end is provided with connection roof (303), be provided with drive lead screw (304) on slip backup pad (202) vertically, be provided with screw (305) on remove portion (302), drive lead screw (304) pass screw (305) and with screw (305) threaded connection.
5. The mining drainage device with an intelligent detection system according to claim 1, wherein: the water pumping mechanism (11) comprises a water inlet (111) arranged on the water pumping device fixing plate (10), a water pump (112) arranged on the movable base (1), and a water pipe (113) communicated between the inlet end of the water pump (112) and the water inlet (111).
6. The mining drainage device with an intelligent detection system according to claim 5, wherein: the water pump (112) is provided with a water outlet end (200), the movable base (1) is provided with an output water main (100), and a plurality of water outlet ends (200) are respectively communicated with the output water main (100).
7. The mining drainage device with an intelligent detection system according to claim 1, wherein: the grading switch (12) is an electromagnetic valve, the distance detection device (9) is a laser measuring instrument, and the data processing controller (13) is editable and controllable.
8. The mining drainage device with an intelligent detection system according to claim 6, wherein: the output water main (100) is provided with a flow calculation module (300), and the flow calculation module (300) is in communication connection with a display terminal.
9. The mine drainage apparatus with intelligent detection system according to ≡7ζ, wherein: the mobile base (1) is provided with monitoring equipment (400), and the monitoring equipment (400) is in communication connection with the display terminal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110426056.3A CN113027523B (en) | 2021-04-20 | 2021-04-20 | Mining drainage equipment with intelligent detection system |
| CN202310514619.3A CN116575981A (en) | 2021-04-20 | 2021-04-20 | Drainage method based on mining drainage equipment with intelligent detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110426056.3A CN113027523B (en) | 2021-04-20 | 2021-04-20 | Mining drainage equipment with intelligent detection system |
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| CN202310514619.3A Division CN116575981A (en) | 2021-04-20 | 2021-04-20 | Drainage method based on mining drainage equipment with intelligent detection system |
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| CN113027523A CN113027523A (en) | 2021-06-25 |
| CN113027523B true CN113027523B (en) | 2023-05-16 |
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| CN202110426056.3A Active CN113027523B (en) | 2021-04-20 | 2021-04-20 | Mining drainage equipment with intelligent detection system |
| CN202310514619.3A Pending CN116575981A (en) | 2021-04-20 | 2021-04-20 | Drainage method based on mining drainage equipment with intelligent detection system |
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| CN202310514619.3A Pending CN116575981A (en) | 2021-04-20 | 2021-04-20 | Drainage method based on mining drainage equipment with intelligent detection system |
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Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201851157U (en) * | 2010-10-19 | 2011-06-01 | 锦州重型水泵有限公司 | Pneumatic automatic drainage device for coal mine |
| CN103046957A (en) * | 2011-10-14 | 2013-04-17 | 孟国营 | Rapidly installed automatic detection control and organization command system for mine rescue and drainage |
| CN204283495U (en) * | 2014-11-20 | 2015-04-22 | 国家电网公司 | The closed draining control cabinet in cable tunnel |
| CN204386649U (en) * | 2015-01-12 | 2015-06-10 | 温州乐控节能科技有限公司 | A kind of Mine Drainage System |
| CN104612980B (en) * | 2015-01-28 | 2017-01-18 | 深圳市钜泰泵业有限公司 | Automatic water level control water pump |
| CN204663577U (en) * | 2015-06-11 | 2015-09-23 | 滁州市西控电子有限公司 | The energy-conservation drainage control system of a kind of New Mine |
| CN110359956B (en) * | 2019-07-08 | 2024-02-20 | 洛阳中重自动化工程有限责任公司 | Sectional control method of mine drainage system based on peak-valley electricity price |
| CN110966046B (en) * | 2019-12-19 | 2022-02-11 | 淮南市阶梯电子科技有限公司 | Ground remote monitoring system of mine drainage device |
| CN212368054U (en) * | 2020-05-20 | 2021-01-19 | 广州极飞科技有限公司 | Water level management equipment and farmland irrigation drainage system |
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2021
- 2021-04-20 CN CN202110426056.3A patent/CN113027523B/en active Active
- 2021-04-20 CN CN202310514619.3A patent/CN116575981A/en active Pending
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| CN116575981A (en) | 2023-08-11 |
| CN113027523A (en) | 2021-06-25 |
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