CN110081037A - Have the accumulator of self-checking function quick stable-pressure device and application method automatically concurrently - Google Patents
Have the accumulator of self-checking function quick stable-pressure device and application method automatically concurrently Download PDFInfo
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- CN110081037A CN110081037A CN201910222224.XA CN201910222224A CN110081037A CN 110081037 A CN110081037 A CN 110081037A CN 201910222224 A CN201910222224 A CN 201910222224A CN 110081037 A CN110081037 A CN 110081037A
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- pressure
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- accumulator
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- pressure device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/027—Installations or systems with accumulators having accumulator charging devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/04—Accumulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/024—Pressure relief valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention belongs to the technical field of the hydraulic fast and stable pressure of underground coal mine explosion-proof vehicle, specifically a kind of accumulator for having self-checking function concurrently quick stable-pressure device and application method automatically.Solve the problems, such as the quick pressure stabilizing of accumulator, including hydraulic oil container, safety valve, working barrel, system pressure table, quick stable-pressure device and accumulator, working barrel one terminates hydraulic oil container, the other end is connected to the P of quick stable-pressure device mouth, safety valve is set between working barrel and hydraulic oil container, the H mouth of quick stable-pressure device connects accumulator and braking or steering system, the A Kou Jie operating mechanism multi-way valve of quick stable-pressure device.The present invention can be with the requirement of the big quick pressure stabilizing of volume accumulator of effective solution.Automatic detection function is also added simultaneously, and investigation when fast and easy stable-pressure device or hydraulic system break down alleviates the labor intensity of worker.
Description
Technical field
It is specifically a kind of to have concurrently certainly the invention belongs to the technical field of the hydraulic fast and stable pressure of underground coal mine explosion-proof vehicle
The accumulator of checking functions quick stable-pressure device and application method automatically.
Background technique
Each main coal mining state, the world all compares approval to many advantages of auxiliary trackless transport mode at present.Accumulator is
Critical elements in auxiliary trackless transport automobile hydraulic system provide pressure oil-source for braking system or emergency turn system, make vehicle
It realizes fast braking and realizes emergency turn hedging under failure, thus the safety of support vehicles.
Since accumulator is pressure vessel, country has been classified as special equipment, and producer must have special equipment manufacturing license
It could process.Larger with the volume of accumulator on heavy vehicle, pressure is high, and volume is generally 4-12L, and pressure energy reaches 15
~19MPa makes accumulator become the container of quite dangerous.Accumulator on underground coal mine heavy vehicle is used to turn to or brake,
Since steering cylinder or brake volume are big, and using frequently, corresponding accumulator volume also increases, it would be highly desirable to solve accumulator
Quick pressure stabilizing, meets user usage requirements.
Summary of the invention
It is automatically fast to provide a kind of accumulator for having self-checking function concurrently in order to solve the problems, such as the quick pressure stabilizing of accumulator by the present invention
Fast stable-pressure device and application method.
The present invention takes following technical scheme: a kind of accumulator having self-checking function concurrently quick stable-pressure device automatically, including
Hydraulic oil container, safety valve, working barrel, system pressure table, quick stable-pressure device and accumulator, the quick stable-pressure device include
Cover board, reset spring, spool, microfilter, valve body, pressure-control valve, zero leakage switch valve, ball valve and check valve, valve body
Cover board is arranged in top, and spool is provided in valve body, and spool is divided into valve intracorporal space the spring cavity of upside and the cavity of resorption of downside,
Cavity of resorption lower end is P mouthfuls, is provided with reset spring in the spring cavity between spool and cover board, is equipped with pressure-control valve on valve body,
Pressure-control valve is connected to the T mouth opened on spring cavity and valve body respectively, and A mouthfuls, A mouthfuls are provided on valve body and spool is intracorporal in valve
Initial position is connected to, and check valve is provided on valve body, is connected on the inside of check valve with cavity of resorption, cavity of resorption oil liquid be arranged can only outward
Ball valve flowing, the oil liquid outside ball valve cannot flow to cavity of resorption, and ball valve outlet is H mouthfuls；Working barrel one terminates hydraulic oil container, another
End is connected to the P of quick stable-pressure device mouth, safety valve is arranged between working barrel and hydraulic oil container, the H mouth of quick stable-pressure device connects
Accumulator and braking or steering system, the A Kou Jie operating mechanism multi-way valve of quick stable-pressure device.
Further, the through-hole I that cavity A is in communication with the outside is provided on valve body, and be provided with that cavity B is in communication with the outside it is logical
Hole II, connects throttle orifice I, through-hole I and through-hole II between through-hole I and through-hole II and extraneous mouth blocks, and is provided in through-hole II
Microfilter.
Further, pressure-control valve is connected to setting in the intracorporal throttle orifice II of valve, and throttle orifice II is opened by zero leakage
Valve is closed to be in communication with the outside.
Further, spool uses pyramidal structure, forms linear sealing with the convex shoulder of valve body.
Further, working barrel exit is provided with system pressure table；Energy storage pressure table is provided on accumulator.
Have the working principle of the accumulator of self-checking function quick stable-pressure device automatically concurrently, after vehicle launch, the S mouth of working barrel
From hydraulic oil container oil suction, high pressure oil is discharged by P1 mouthfuls, while the P1 mouthfuls of P mouths also with the P2 of safety valve mouth and quick stable-pressure device
It is connected, when overloading or breaking down occur in system, safety valve is opened, and P2 mouthfuls communicate with T mouthfuls, and high pressure oil returns to oil through T mouthfuls
Case；
In the normal situation of system, the high pressure oil that working barrel provides reaches the P mouth of quick stable-pressure device through P1 mouthfuls, and high pressure oil is straight
It connects and is applied on spool, under the spring force of reset spring and P mouthfuls of high pressure oil is reached through microfilter and throttle orifice I
The spring cavity of spool, high pressure oil have downward active force to spool, can since the spring cavity area of spool is greater than the area of cavity of resorption
Know that the power of the spring cavity of spool at this time is greater than the power of cavity of resorption, is in close state spool, the P mouth high pressure oil of quick stable-pressure device
It can only be connected through H mouthfuls of check valve and ball valve normally opened arrival, H mouthfuls with the X of accumulator mouth, the high-voltage oil liquid that working barrel provides is to accumulation of energy
Device fluid infusion reaches the pressure of setting；While giving accumulator fluid infusion, and pressure oil is taken to open through zero leakage from its runner
Closing the control mouth that valve is normally opened, throttle orifice II reaches pressure-control valve opens pressure-control valve when pressure reaches setting value,
So that the pressure oil of spring cavity is reached T mouthfuls through pressure-control valve and return hydraulic oil container, the epicoele of spool only remains the work of reset spring at this time
Firmly it is less than the active force of cavity of resorption P mouthfuls of pressure oil, spool will be pushed to move upwards, spool is opened, and pressure oil reaches A through runner
Mouthful, go operating mechanism's multi-way valve or other oil circuits to work；After the pressure of accumulator is supplied to steering or braking system, pressure drop
It is low, be lower than setting value when, pressure-control valve return be automatically closed, make working barrel provide high pressure oil through quick stable-pressure device rapidly to
Accumulator fluid infusion makes it reach the pressure value of setting again.
Compared with prior art, the present invention can be with the requirement of the big quick pressure stabilizing of volume accumulator of effective solution.Together
When also add automatic detection function, investigation when fast and easy stable-pressure device or hydraulic system break down alleviates worker
Labor intensity.Discussion on Auxiliary Trackless Transport in Coal Mine has a extensive future at present, and the demand to downhole anti-explosion vehicle quicklys increase, at present
Domestic demand amount is about every year at 200~300 or so, and 20,000 yuan of the every set price of the present apparatus, the gross output value is up to 400~6,000,000
Member, every 0.6 ten thousand yuan of profit calculating can produce profit 120~1,800,000 yuan, and the development and application of the present apparatus can be raising underground
Safety in vehicle driving reduces the generation of contingency.Strong guarantee will be provided for the safety in production of enterprise.
Detailed description of the invention
Fig. 1 is quick stable-pressure device structural schematic diagram；
Fig. 2 is quick stable-pressure device valve schematic diagram；
Fig. 3 is the former road figure of quick voltage-stabilizing system work；
1- hydraulic oil container in figure, 2- safety valve, 3- working barrel, 4- system pressure table, the quick stable-pressure device of 5-, 6- accumulator, 7-
Energy storage pressure table, 5.1- cover board, 5.2- reset spring, 5.3- throttle orifice I, 5.4- spool, 5.5- microfilter, 5.6- valve
Body, 5.7- pressure-control valve, 5.8- throttle orifice II, 5.9- zero leakage switch valve, 5.10- ball valve, 5.11- check valve.
Specific embodiment
A kind of hydraulic fast and stable pressure apparatus of underground coal mine explosion-proof vehicle, including it is sequentially connected fuel tank, working barrel, fast
Fast stable-pressure device, safety valve and accumulator, working barrel 3 one terminate hydraulic oil container 1, the P mouth of the other end and quick stable-pressure device 5
Connection, between working barrel 3 and hydraulic oil container 1 be arranged safety valve 2, H mouth of quick stable-pressure device 5 connect accumulator 6 and brake or
Steering system, the A Kou Jie operating mechanism multi-way valve of quick stable-pressure device 5.Quick stable-pressure device also with operating mechanism's multi-way valve with
And fuel tank connection, accumulator outlet connect the pressure gauge on instrument board.As shown in Figure 1.
When vehicle launch, working barrel is from fuel tank oil suction, and the hydraulic oil pumped out is judged automatically through quick stable-pressure device, in accumulation of energy
It boosts in the case where device insufficient pressure to its fluid infusion, when pressure reaches rated value, quick stable-pressure device is automatically and operating mechanism
The connection such as multi-way valve, to the offer oil sources of other operating mechanisms on vehicle.When system occurs abnormal, the high pressure oil warp of offer is pumped
Safety valve lets out oil return box, to protect each valve in system and various operating mechanisms.
Fig. 2 show quick stable-pressure device valve schematic diagram, and the quick stable-pressure device 5 includes cover board 5.1, reset spring
5.2, spool 5.4, microfilter 5.5, valve body 5.6, pressure-control valve 5.7, zero leakage switch valve 5.9, ball valve 5.10 and list
To valve 5.11, cover board 5.1 is arranged in 5.6 top of valve body, is provided with spool 5.4 in valve body 5.6, spool 5.4 is the sky in valve body 5.6
Between be divided into the spring cavity of upside and the cavity of resorption of downside, cavity of resorption lower end is P mouthfuls, is set in the spring cavity between spool 5.4 and cover board 5.1
Be equipped with reset spring 5.2, pressure-control valve 5.7 be installed on valve body 5.6, pressure-control valve 5.7 respectively with spring cavity and valve
The T mouth opened on body 5.6 is connected to, and is provided with A mouthfuls on valve body 5.6, A mouthfuls are connected to initial position of the spool 5.4 in valve body 5.6, valve
Check valve 5.11 is provided on body 5.6,5.11 inside of check valve is connected to cavity of resorption, is provided with ball valve on the outside of check valve 5.11
5.10, the outlet of ball valve 5.10 is H mouthfuls.
It is provided with the through-hole I that cavity A is in communication with the outside on valve body 5.6, and is provided with the through-hole II that cavity B is in communication with the outside,
Throttle orifice I5.3, through-hole I and through-hole II are connected between through-hole I and through-hole II and extraneous mouth blocks, and are provided in through-hole II micro-
Type filter 5.5.Pressure-control valve 5.7 is connected to the throttle orifice II5.8 being arranged in valve body 5.6, and throttle orifice II5.8 passes through zero
Leakage switch valve 5.9 is in communication with the outside.
According to underground coal mine explosion-proof vehicle actual condition, brakes or turned to frequently in the process of moving, lead to accumulator pressure
Power constantly changes, and existing product is not able to satisfy the requirement of fast and stable pressure since flow is small.Quick stable-pressure device passes through increasing
The latus rectum of big valve core 5.4 is realized to energy storage pressure fast and stable, and actual operation requirements are met.Spool 5.4 uses pyramidal structure,
Linear sealing is formed with the convex shoulder of valve body 5.6, it is ensured that the reliability of sealing.
After vehicle launch, high pressure oil is discharged by P1 mouthfuls from 1 oil suction of hydraulic oil container for the S mouth of working barrel 3, while P1 mouthfuls are gone back
It is connected with the P mouth of the P2 of safety valve 2 mouth and quick stable-pressure device 5.When overloading or breaking down occur in system, safety valve 2
It opens, P2 mouthfuls communicate with T mouthfuls, and high pressure oil returns to fuel tank through T mouthfuls, protect each valve in system and various operating mechanisms.
In the normal situation of system, the high pressure oil that working barrel 3 provides reaches the P mouth of quick stable-pressure device 5 through P1 mouthfuls, high
Pressure oil is applied directly on spool 5.4, but under the spring force of reset spring 5.2 and P mouthfuls of high pressure oil is through microfilter
5.5 and throttle orifice I5.3 reaches the spring cavity of spool 5.4, and high pressure oil has downward active force to spool 5.4.Due to spool 5.4
Epicoele (spring cavity) area be greater than the area of cavity of resorption, by the power of the epicoele of spool 5.4 is greater than cavity of resorption at this time known to formula F=PS
Power, be in close state spool 5.4.The P mouth high pressure oil of quick stable-pressure device 5 can only be through check valve 5.11 and ball valve 5.10
H mouthfuls of normally opened arrival, H mouthfuls are connected with the X of accumulator 6 mouth, and the high-voltage oil liquid that working barrel 3 provides is reached to 6 fluid infusion of accumulator
The pressure of setting.
While giving 6 fluid infusion of accumulator, and take from its runner that pressure oil is normally opened through zero leakage switch valve 5.9, throttling
Hole II5.8 reaches the control mouth of pressure-control valve 5.7, when pressure reaches setting value, opens pressure-control valve 5.7, makes bullet
The pressure oil of spring chamber reaches T mouthfuls through pressure-control valve 5.7 and returns hydraulic oil container 1, and the epicoele of spool 5.4 only remains reset spring at this time
5.2 active force is less than the active force of cavity of resorption P mouthfuls of pressure oil, and spool 5.4 will be pushed to move upwards, and spool is opened, pressure oil warp
Runner reaches A mouthfuls, and operating mechanism's multi-way valve or other oil circuits is gone to work.After the pressure of accumulator 6 is supplied to steering or braking,
Pressure reduction, when being lower than setting value, pressure-control valve 5.7, which returns, to be automatically closed, and the high pressure oil for providing working barrel 3 is through quick pressure stabilizing
Device makes it reach the pressure value of setting again to 6 fluid infusion of accumulator rapidly.
For service life and the reliability for improving quick stable-pressure device, throttle orifice I5.3, throttle orifice are increased in device design
II5.8 reduces impact when valve core movement, improves the service life of component.Since the oil liquid of throttle orifice I5.3 often flows back liquid
Pressure oil case, in the case where oil cleanliness difference, throttle orifice I5.3 is easily blocked, and causes quick stable-pressure device normal
Work.To avoid such case, microfilter 5.5 is increased on the runner of throttle orifice I5.3, is reduced because of throttle orifice
Failure caused by I5.3 is blocked.
The self-checking function of quick stable-pressure device: if the pressure of accumulator 6 cannot reach setting value, even pressure is zero, is led to
This pressure value can be observed at any time by crossing energy storage pressure table 7.It needs to close ball valve 5.10, if energy storage pressure table at this time
7 displays can reach setting value, illustrate accumulator 6, go in the oil circuit of braking system or steering system have leakage, need to check oil
Road, quick stable-pressure device are working properly.After ball valve 5.10 is closed, pressure cannot still reach setting value, need to open zero leakage
It closes valve 5.9 to close, if pressure reaches setting value at this time, illustrates the damage of pressure-control valve 5.7 or holding, need replacing this
Valve.It during malfunction elimination, does not need to dismount the pipeline on quick stable-pressure device, avoid because worker is with press operation, and occur
Dangerous possibility.
The working range of quick stable-pressure device is wider, by adjusting the setting pressure of pressure-control valve 5.7, to determine quickly
The operating pressure of stable-pressure device.
Claims (6)
1. a kind of accumulator for having self-checking function concurrently quick stable-pressure device automatically, it is characterised in that: including hydraulic oil container (1), peace
Full valve (2), working barrel (3), system pressure table (4), quick stable-pressure device (5) and accumulator (6), the quick stable-pressure device
It (5) include cover board (5.1), reset spring (5.2), spool (5.4), microfilter (5.5), valve body (5.6), pressure-control valve
(5.7), cover board (5.1) are arranged in zero leakage switch valve (5.9), ball valve (5.10) and check valve (5.11), valve body (5.6) top,
It is provided with spool (5.4) in valve body (5.6), spool (5.4) is divided into the space in valve body (5.6) spring cavity and the downside of upside
Cavity of resorption, cavity of resorption lower end is P mouthfuls, is provided with reset spring (5.2), valve in the spring cavity between spool (5.4) and cover board (5.1)
Be equipped on body (5.6) pressure-control valve (5.7), pressure-control valve (5.7) respectively with open on spring cavity and valve body (5.6)
T mouthfuls are connected to, and are provided with A mouthfuls on valve body (5.6), A mouthfuls are connected to initial position of the spool (5.4) in valve body (5.6), valve body
(5.6) it is provided on check valve (5.11), is connected on the inside of check valve (5.11) with cavity of resorption, be provided with ball on the outside of check valve (5.11)
Valve (5.10), ball valve (5.10) outlet are H mouthfuls；Working barrel (3) one terminates hydraulic oil container (1), the other end and quick stable-pressure device
(5) P mouth connection, is arranged safety valve (2) between working barrel (3) and hydraulic oil container (1), the H mouth of quick stable-pressure device (5) connects storage
Energy device (6) and braking or steering system, the A Kou Jie operating mechanism multi-way valve of quick stable-pressure device (5).
2. the accumulator according to claim 1 for having self-checking function concurrently quick stable-pressure device automatically, it is characterised in that: described
Valve body (5.6) on be provided with the through-hole I that cavity A is in communication with the outside, and be provided with the through-hole II that cavity B is in communication with the outside, through-hole I
Throttle orifice I(5.3 is connected between through-hole II), through-hole I and through-hole II and extraneous mouth are blocked, and are provided with miniature mistake in through-hole II
Filter (5.5).
3. the accumulator according to claim 2 for having self-checking function concurrently quick stable-pressure device automatically, it is characterised in that: described
Pressure-control valve (5.7) with throttle orifice II(5.8 in valve body (5.6) is set) be connected to, throttle orifice II(5.8) pass through zero and let out
Leakage switch valve (5.9) is in communication with the outside.
4. the accumulator according to claim 3 for having self-checking function concurrently quick stable-pressure device automatically, it is characterised in that: described
Spool (5.4) use pyramidal structure, form linear sealing with the convex shoulder of valve body (5.6).
5. the accumulator according to claim 4 for having self-checking function concurrently quick stable-pressure device automatically, it is characterised in that: described
Working barrel (3) exit be provided with system pressure table (4)；Energy storage pressure table (7) are provided on accumulator (6).
6. a kind of application method of accumulator for having self-checking function concurrently as claimed in claim 5 quick stable-pressure device automatically,
Be characterized in that: after vehicle launch, the S mouth of working barrel (3) high pressure oil is discharged by P1 mouthfuls, while P1 from hydraulic oil container (1) oil suction
Mouth is also connected with the P mouth of the P2 mouth of safety valve (2) and quick stable-pressure device (5)；
When overloading or breaking down occur in system, safety valve (2) is opened, and P2 mouthfuls communicate with T mouthfuls, and high pressure oil returns to oil through T mouthfuls
Case；
In the normal situation of system, the high pressure oil that working barrel (3) provides reaches the P mouth of quick stable-pressure device (5) through P1 mouthfuls, high
Pressure oil is applied directly on spool (5.4), and under the spring force of reset spring (2) and P mouthfuls of high pressure oil is through microfilter
(5) and throttle orifice I(3) reach spool (5.4) spring cavity, high pressure oil has downward active force to spool (3), due to spool
(5.4) spring cavity area is greater than the area of cavity of resorption, it is known that the power of the spring cavity of spool (5.4) is greater than the power of cavity of resorption at this time, makes
Spool (5.4) is in close state, and the P mouth high pressure oil of quick stable-pressure device (5) can only be through check valve (5.11) and ball valve
(5.10) H mouthfuls of normally opened arrival, H mouthfuls are connected with the X mouth of accumulator (6), and the high-voltage oil liquid that working barrel (3) provides gives accumulator (6)
Fluid infusion reaches the pressure of setting；While giving accumulator (6) fluid infusion, and pressure oil is taken to open through zero leakage from its runner
Close valve (5.9) normally opened, throttle orifice II(5.8) reach pressure-control valve (5.7) control mouth make when pressure reaches setting value
Pressure-control valve (5.7) is opened, and so that the pressure oil of spring cavity is reached T mouthfuls through pressure-control valve (5.7) and is gone back to hydraulic oil container (1), this
When spool (5.4) epicoele only remain reset spring (5.2) active force be less than cavity of resorption P mouthfuls of pressure oil active force, valve will be pushed
Core (5.4) moves upwards, and spool is opened, and pressure oil reaches A mouthfuls through runner, and operating mechanism's multi-way valve or other oil circuits is gone to work；
After the pressure of accumulator (6) is supplied to steering or braking system, pressure reduction, when being lower than setting value, pressure-control valve (5.7)
It returns and is automatically closed, the high pressure oil for providing working barrel (3) reaches it again to accumulator (6) fluid infusion rapidly through quick stable-pressure device
To the pressure value of setting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910222224.XA CN110081037B (en) | 2019-03-22 | 2019-03-22 | Automatic and rapid voltage stabilizing device with self-checking function for energy accumulator and using method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910222224.XA CN110081037B (en) | 2019-03-22 | 2019-03-22 | Automatic and rapid voltage stabilizing device with self-checking function for energy accumulator and using method |
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| CN110081037A true CN110081037A (en) | 2019-08-02 |
| CN110081037B CN110081037B (en) | 2020-06-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110433733A (en) * | 2019-08-28 | 2019-11-12 | 郑州中南杰特超硬材料有限公司 | A kind of automatic protective system for nano-polycrystalline diamond synthesis |
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| CN110081037B (en) | 2020-06-05 |
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