CN102717788A - Braking device of heavy-duty mining dump truck - Google Patents
Braking device of heavy-duty mining dump truck Download PDFInfo
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- CN102717788A CN102717788A CN2012101905755A CN201210190575A CN102717788A CN 102717788 A CN102717788 A CN 102717788A CN 2012101905755 A CN2012101905755 A CN 2012101905755A CN 201210190575 A CN201210190575 A CN 201210190575A CN 102717788 A CN102717788 A CN 102717788A
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Abstract
The invention belongs to the field of rigid mining dump trucks, and particularly relates to a braking device of a heavy-duty mining dump truck. The braking device comprises an oil tank, a brake pump, a braking multiple-unit valve, a pedal braking valve and a front brake, an oil suction port of the brake pump is connected with the oil tank, an oil outlet of the brake pump is connected with the braking multiple-unit valve via a filter, the braking multiple-unit valve is respectively connected with a parking braking valve and the pedal braking valve, the pedal braking valve is respectively connected with the front brake and the parking braking valve, and the parking braking valve is respectively connected with a rear brake and a parking brake. Since the braking multiple-unit valve, the parking braking valve and a loading braking valve are arranged to enable the braking device of the heavy-duty mining dump truck to realize functions of driving brake, parking brake, loading brake, emergency brake and automatic brake, safety and reliability of the truck are effectively improved.
Description
Technical field
The invention belongs to the self-discharging vehicle for rigid mining field, be specifically related to a kind of heavy mining truck brake equipment.
Background technology
Heavy mining truck belongs to non-highway dumping car; Be mainly used in the transportation of large surface mine ore; Heavy mining truck mainly is made up of rigid-frame, driving engine, transmission gearbox, back axle assembly, operator's compartment assembly, brake equipment etc.; Wherein brake equipment is the important component part of heavy mining truck, and especially safety and the reliability to dumping car has fundamental influence.
The non-highway dumping car of present little tonnage generally adopts air braking systems; The non-highway dumping car of large-tonnage uses hydraulic brake system; Air braking systems makes pressurized air entering air-actuator make car brakeing through stepping on the brake pedal valve; Because more, pipeline complex connection of air braking systems element and lock torque are little, so be not suitable on the large-tonnage dumping car, using.The hydraulic brake system lock torque is big, compact conformation, on the large-tonnage dumping car, generally use, but heavy mining truck is operated in glory-hole mostly, and the gradient is big, bend is many, therefore the safety and the reliability of brake equipment is had higher requirement.
Summary of the invention
The object of the present invention is to provide a kind of safe and reliable, car brakeing to be quick on the draw, rapidly, and a kind of heavy mining truck brake equipment with the braking of loading and autobrake function.
Technical solution is:
The present invention includes: fuel tank, brake pump, braking multiway valve, pedal brake valve, front brake, the oil suction of brake pump is connected with fuel tank, and oil outlet is connected with the braking multiway valve through filter; Said braking multiway valve is connected with braking during standstill valve, brake pedal valve respectively, and said brake pedal valve is connected with the braking during standstill valve with front brake respectively, and said braking during standstill valve is connected with Parking Brake with rear brake respectively.
Said braking multiway valve is provided with P, PY, ACC1, ACC2, PS1, PS2, PS3, A, B, P1, T mouth; Braking multiway valve inside is provided with solenoid directional control valve, back brake accumulator check valve, preceding brake energy storage device check valve; Back brake accumulator check valve outlet is connected with the import of solenoid directional control valve; The return opening of solenoid directional control valve is connected with the T mouth of braking multiway valve, the outlet of solenoid directional control valve be connected with A, the B mouth of braking multiway valve respectively; The oil inlet of back brake accumulator check valve, preceding brake energy storage device check valve with respectively with the braking multiway valve the P mouth be connected; ACC1, the ACC2 mouth of braking multiway valve are connected with energy storage respectively; PS1, PS2, the PS3 mouth of braking multiway valve is separately installed with braking during standstill pressure switch, back brake accumulator pressure switch, preceding brake accumulator pressure switch, and the braking during standstill pressure switch is output signal when removing braking during standstill; Back brake accumulator pressure switch, preceding brake accumulator pressure switch output signal when energy storage pressure is lower than setting value, it is electric that the interior solenoid directional control valve of braking multiway valve is got, and makes vehicle implement autobrake.
Said braking during standstill valve is provided with RB, RB1, RT, P2, RB2, TEST mouth; Braking during standstill valve inside comprises reducing valve, cutoff port, back pressure valve and shuttle valve; The import of reducing valve is connected with P2 mouth on the braking during standstill valve, and the outlet of reducing valve is connected with the import of cutoff port through filter screen; The cutoff port outlet reaches with the back pressure valve import respectively, first import of shuttle valve is connected; The outlet of back pressure valve is connected with RT mouth on the braking during standstill valve; The RB mouth is connected on second import of shuttle valve and the braking during standstill valve; The RB1 mouth is connected on the outlet of shuttle valve and the braking during standstill valve, and the TEST mouth on the braking during standstill valve is connected with the RB1 mouth.
Also be provided with the loading brake activation valve between further pedal brake valve of the present invention and the front brake, front-wheel brake is not braked in the process of charging and discharging, and rear wheel brake, parking brake are implemented braking, and said loading brake activation valve also is provided with " loading braking " switch.
The present invention further brakes between the Px mouth of A mouth and pedal brake valve on the multiway valve and also is provided with directional control valve; Make dumping car pressure oil when emergency braking get into brake pedal valve pilot control opening, promote brake pedal valve delivery pressure front-wheel, trailing wheel are braked simultaneously through the direction control cock.
The PS4 of the further pedal brake valve of the present invention, PS5 mouth are separately installed with back brake-pressure switch and preceding brake-pressure switch, pressure switch output signal when the brake pedal valve is worked.
Brake pump according to the invention is a constant pressure variable displacement pump, and the propulsion source of steady pressure is provided for brake equipment; Fuel tank is the device of storage hydraulic oil; Filter plays a part the hydraulic oil filter cleaning; Comprise a solenoid directional control valve and two check valves in the braking multiway valve; Solenoid directional control valve gets electric back and removes braking during standstill; Dumping car can go; Being provided with of two check valves can prevent front wheel brake hydraulic oil and the mutual interference of trailing wheel brake fluid pressure oil phase, brakes multiway valve simultaneously and also is connected with two energy storages, as the auxiliary power source of dumping car brake equipment; The brake pedal valve is the executive component of car brakeing, can also can control oil control by the guide by manual operation, and the fluid of brake pedal valve output gets into front-wheel brake respectively and rear wheel brake is braked vehicle; Comprise reducing valve, filter screen, cutoff port, back pressure valve, shuttle valve in the braking during standstill valve; Reducing valve will get into the fluid decompression of Parking Brake; Filter screen, cutoff port, back pressure valve make the fluid in the rear wheel brake remain with certain pressure; Next time, glancing impact can reduce braking time, and braking rapidly, reliably.
Description of drawings
Fig. 1 is a brake equipment engine off of the present invention, braking during standstill application state hydraulic schematic diagram;
Fig. 2 is a brake equipment engine running of the present invention, braking during standstill disarm state hydraulic schematic diagram;
Fig. 3 is a brake equipment engine running of the present invention, service brake state hydraulic schematic diagram;
Fig. 4 is a brake equipment engine running of the present invention, the emergency braking condition hydraulic schematic diagram.
Wherein: 1, fuel tank; 2, brake pump; 3, filter; 4, braking multiway valve; 5, braking during standstill valve; 6, brake pedal valve; 7, directional control valve; 8, load brake activation valve; 9, front-wheel brake; 10, rear wheel brake; 11, Parking Brake; 12, energy storage; 13, braking during standstill pressure switch; 14, back brake accumulator pressure switch; 15, preceding brake accumulator pressure switch; 16, back brake-pressure switch; 17, preceding brake-pressure switch, braking multiway valve 4 inside comprise: 18, solenoid directional control valve; 19, back brake accumulator check valve; 20, preceding brake accumulator check valve, braking during standstill valve 5 inside comprise: 21, reducing valve; 22, filter screen, 23, cutoff port; 24, back pressure valve, 25, shuttle valve.
The specific embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is described in detail:
Referring to figs. 1 through shown in Figure 4; Fuel tank of the present invention 1, brake pump 2, filter 3, braking multiway valve 4, braking during standstill valve 5, brake pedal valve 6, directional control valve 7, load brake activation valve 8, front-wheel brake 9, rear wheel brake 10, Parking Brake 11, energy storage 12, braking during standstill pressure switch 13, back brake accumulator pressure switch 14, preceding brake accumulator pressure switch 15, back brake-pressure switch 16, preceding brake-pressure switch 17; The oil suction of brake pump 2 is connected with fuel tank 1, and oil outlet is connected with braking multiway valve 4 through filter 2; Said braking multiway valve 4 is connected with braking during standstill valve 5, brake pedal valve 6 respectively, and said brake pedal valve 6 is connected with braking during standstill valve 5 with front brake 9 respectively, and said braking during standstill valve 5 is connected with Parking Brake 11 with rear brake 10 respectively.
Braking multiway valve 4 is provided with P, PY, ACC1, ACC2, PS1, PS2, PS3, A, B, P1, T mouth; Braking multiway valve 4 inside are provided with solenoid directional control valve 18, back brake accumulator check valve 19, preceding brake energy storage device check valve 20; Back brake accumulator check valve 19 outlets are connected with the import of solenoid directional control valve 18; The return opening of solenoid directional control valve 18 is connected with the T mouth of braking multiway valve 4, the outlet of solenoid directional control valve 18 be connected with the A, the B that brake multiway valve 4 respectively; The oil inlet of back brake accumulator check valve 19, preceding brake energy storage device check valve 20 be connected with the P mouth of braking multiway valve 4 respectively.
The B mouth of braking multiway valve 4 is connected with the P2 mouth of braking during standstill valve 5; PY, the P1 mouth of braking multiway valve 4 are connected with Py, the Pz mouth of brake pedal valve 6 respectively; The B1 mouth of brake pedal valve 6 is through loading brake activation valve 8 and front brake 9, and the B2 mouth of brake pedal valve 6 is connected with the RB mouth of braking during standstill valve 5.
In order to improve the peaceful performance of vehicle, between the Px mouth of the A mouth of braking multiway valve 4 and pedal brake valve 6, also be provided with directional control valve 7; The B mouth of braking multiway valve 4 connects the P2 mouth of braking during standstill valve; The T mouth connects fuel tank 1; ACC1, the ACC2 mouth of braking multiway valve 4 are connected with energy storage 12 respectively, and PS1, PS2, the PS3 mouth of braking multiway valve 4 is separately installed with braking during standstill pressure switch 13, back brake accumulator pressure switch 14, preceding brake accumulator pressure switch 15.
When dumping car will go, unclamp in the operator's compartment " urgent/Parking " brake switch make solenoid directional control valve 18 electric, pressure oil gets into Parking Brake 11 removes braking during standstill, dumping car can go.The effect of back brake accumulator check valve 19 and preceding brake accumulator check valve 20 is to prevent front wheel brake hydraulic oil and the mutual interference of trailing wheel brake fluid pressure oil phase.
Braking during standstill valve 5 of the present invention is provided with RB, RB1, RT, P2, RB2, TEST mouth; Braking during standstill valve inside comprises reducing valve 21, cutoff port 23, back pressure valve 24 and shuttle valve 25; The import of reducing valve 21 is connected with P2 mouth on the braking during standstill valve 5; The effect of reducing valve 21 is that the setting value that reduces pressure of the high pressure oil with system is applied to Parking Brake 11, and the outlet of reducing valve 21 is connected through the import of filter screen 22 with cutoff port 23; Cutoff port 23 outlets reach with back pressure valve 24 imports respectively, first import of shuttle valve 25 is connected; The outlet of back pressure valve 24 is connected with RT mouth on the braking during standstill valve 5; The RB mouth is connected on second import of shuttle valve 25 and the braking during standstill valve 5, and the RB1 mouth is connected on the outlet of shuttle valve 25 and the braking during standstill valve 5, and the TEST mouth on the braking during standstill valve 5 is connected with the RB1 mouth; The effect of filter screen 22 is that the fluid cleaning is prevented that cutoff port 23 from stopping up; Cutoff port 23, back pressure valve 24, shuttle valve 25 make the fluid in the rear wheel brake remain with certain pressure, and next glancing impact can reduce braking time, make braking reliable rapidly.
The RB mouth of braking during standstill valve 5 is connected with the B2 mouth of brake pedal valve 6, and the RT mouth is connected with hydraulic reservoir 1, and RB1, RB2 mouth are connected with rear wheel brake 10, Parking Brake 11 respectively, and the TEST mouth is used to detect the pressure of back braking fluid.
Also be provided with between pedal brake valve 6 and the front brake 9 and load brake activation valve 8; The PS4 of said pedal brake valve 6, PS5 mouth are separately installed with back brake-pressure switch 16 and preceding brake-pressure switch 17.
The B1 mouth of brake pedal valve 6 connects the LP mouth that loads brake activation valve 8; The LA mouth of Px mouth closure control cock 7; Directional control valve 7 is by the transmission gearbox pressure control, when dumping car turns round, from the valve core movement of the pressure oil pushing direction control cock 7 of transmission gearbox LA mouth and LP mouth is communicated with; After dumping car was flame-out, the spring of directional control valve 7 will promote valve core movement was communicated with LA mouth LT.
Describe working process of the present invention below in detail:
(1) engine off, braking during standstill is used, and sees Fig. 1; This moment engine stoping operation; Cut off the dumping car Vehicle Power, at this moment have only energy storage 12 to have certain pressure oil liquid, solenoid directional control valve 18 makes Parking Brake 11 internal pressure oil be discharged into hydraulic reservoir; The spring force of Parking Brake 11 is with rear lock, and dumping car is in the braking during standstill application state.
(2) engine running, braking during standstill is removed, and sees Fig. 2, engine drive brake pump 2 runnings this moment, energy storage 12 is full of pressure oil, and this moment, directional control valve 7 commutated under the effect of transmission gearbox engine oil pressure, and the LP mouth of directional control valve 7 and LA mouth are communicated with; Chaufeur unclamps " urgent/Parking " stop button; Solenoid directional control valve 18 gets the switching-over of electric back; Pressure oil gets into the P2 mouth of braking during standstill valve 5 through solenoid directional control valve 18 back from the B mouth output of braking multiway valve 4, goes into Parking Brake 11 through reducing valve 21 decompressions are laggard again, and Parking Brake 11 unclamped trailing wheel after hydraulic coupling overcame spring force; Vehicle can go, and dumping car is in the braking during standstill disarm state.
(3) engine running, service brake is implemented, and sees Fig. 3; Step on the pedal of brake pedal valve 6, through B1, the output of B2 mouth of brake pedal valve 6, the fluid of B1 mouth gets into front-wheel brake 9 through loading brake activation valve 8 to pressure oil respectively; The fluid of B2 mouth gets into the RB mouth of braking during standstill valve 5; Get into rear wheel brake 10 through shuttle valve 25 backs again, because the effect of filter screen 22, cutoff port 23, back pressure valve 24, shuttle valve 25 makes rear wheel brake 10 remain with certain low pressure fluid, can reduce braking time simultaneously; Make braking reliable rapidly, so front-wheel brake 9, rear wheel brake 10 play brake action simultaneously when the driving braking mode.
(4) engine running, emergency braking is seen Fig. 4; During engine running, press " urgent/Parking " stop button, solenoid directional control valve 18 dead electricity; Pressure oil is through the A mouth output of solenoid directional control valve 18 backs by braking multiway valve 4; Pressure oil gets into the pilot control opening Px of brake pedal valve 6 again through directional control valve 7, promote 6 work of brake pedal valve, and promptly pressure oil gets into front-wheel brake 9 through brake pedal valve 6 and makes its braking with rear wheel brake 10; Fluid hold-off pressure in the while Parking Brake 11, Parking Brake 11 locking trailing wheels are so the front-wheel brake 9 of dumping car, rear wheel brake 10, parking brake 11 play brake action simultaneously when emergency braking condition.
(5) engine running loads braking, sees Fig. 4; When charging or discharging, press " loading " stop button, solenoid directional control valve 18 dead electricity are loaded brake activation valve 8 and are got; The Px mouth that pressure oil gets into brake pedal valve 6 promotes 6 work of brake pedal valve, and the B1 mouth delivery pressure of brake pedal valve 6 is loaded brake activation valve 8 and cuts off, and the pressure oil of B2 mouth output gets into rear wheel brake 10; Pressure oil in the Parking Brake 11 discharges through solenoid directional control valve 18; Be Parking Brake 11 locking trailing wheels, so front-wheel brake 9 unclamps when loading braking mode, rear wheel brake 10 plays brake action simultaneously with 11 pairs of Parking Brakes.
(6) engine running; Autobrake; When vehicle in when operation, when dropping to first setting value owing to the pressure in the reason energy storages such as the system failure 12, back brake accumulator pressure switch 14 or preceding brake accumulator pressure switch 15 will be sent a signal and make that to hang down the brake-pressure alarm lamp in the operator's compartment bright; The warning driver is flame-out stops; If vehicle not have flame-out and energy storage 12 interior pressure when dropping to second setting value, back brake accumulator pressure switch 14 or preceding brake accumulator pressure switch 15 will be sent a signal once more and make solenoid directional control valve 18 dead electricity, let vehicle forced parking.
Claims (7)
1. heavy mining truck brake equipment; Said device comprises: fuel tank (1), brake pump (2), braking multiway valve (4), pedal brake valve (6), front brake (9); It is characterized in that: the oil suction of brake pump (2) is connected with fuel tank (1), and oil outlet is connected with braking multiway valve (4) through filter (2); Said braking multiway valve (4) is connected with braking during standstill valve (5), brake pedal valve (6) respectively; Said brake pedal valve (6) is connected with braking during standstill valve (5) with front brake (9) respectively, and said braking during standstill valve (5) is connected with Parking Brake (11) with rear brake (10) respectively.
2. heavy mining truck brake equipment according to claim 1; It is characterized in that: said braking multiway valve (4) is provided with P, PY, ACC1, ACC2, PS1, PS2, PS3, A, B, P1, T mouth; Braking multiway valve (4) inside is provided with solenoid directional control valve (18), back brake accumulator check valve (19), preceding brake energy storage device check valve (20); Back brake accumulator check valve (19) outlet is connected with the import of solenoid directional control valve (18); The return opening of solenoid directional control valve (18) is connected with the T mouth of braking multiway valve (4), the outlet of solenoid directional control valve (18) be connected with A, the B mouth of braking multiway valve (4) respectively; The oil inlet of back brake accumulator check valve (19), preceding brake energy storage device check valve (20) with respectively with the braking multiway valve (4) the P mouth be connected.
3. heavy mining truck brake equipment according to claim 1; It is characterized in that: said braking during standstill valve (5) is provided with RB, RB1, RT, P2, RB2, TEST mouth; Braking during standstill valve inside comprises reducing valve (21), cutoff port (23), back pressure valve (24) and shuttle valve (25); The import of reducing valve (21) is connected with P2 mouth on the braking during standstill valve (5), and the outlet of reducing valve (21) is connected through the import of filter screen (22) with cutoff port (23); Cutoff port (23) outlet difference (5) reaches with back pressure valve (24) import, first import of shuttle valve (25) is connected; The outlet of back pressure valve (24) is connected with RT mouth on the braking during standstill valve (); Second import of shuttle valve (25) is gone up the RB mouth with braking during standstill valve (5) and is connected; The outlet of shuttle valve (25) is gone up the RB1 mouth with braking during standstill valve (5) and is connected, and the TEST mouth on the braking during standstill valve (5) is connected with the RB1 mouth.
4. heavy mining truck brake equipment according to claim 1 is characterized in that: also be provided with between said pedal brake valve (6) and the front brake 9 and load brake activation valve (8).
5. heavy mining truck brake equipment according to claim 1 and 2 is characterized in that: also be provided with directional control valve (7) between the Px mouth of PY mouth on the said braking multiway valve (4) and pedal brake valve (6).
6. heavy mining truck brake equipment according to claim 5; It is characterized in that: ACC1, the ACC2 mouth of braking multiway valve (4) are connected with energy storage (12) respectively, and PS1, PS2, the PS3 mouth of braking multiway valve (4) is separately installed with braking during standstill pressure switch (13), back brake accumulator pressure switch (14), preceding brake accumulator pressure switch (15).
7. heavy mining truck brake equipment according to claim 1 is characterized in that: the PS4 of said pedal brake valve (6), PS5 mouth are separately installed with back brake-pressure switch (16) and preceding brake-pressure switch (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101905755A CN102717788A (en) | 2012-06-01 | 2012-06-01 | Braking device of heavy-duty mining dump truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101905755A CN102717788A (en) | 2012-06-01 | 2012-06-01 | Braking device of heavy-duty mining dump truck |
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| CN102717788A true CN102717788A (en) | 2012-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012101905755A Pending CN102717788A (en) | 2012-06-01 | 2012-06-01 | Braking device of heavy-duty mining dump truck |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103407442A (en) * | 2013-07-23 | 2013-11-27 | 内蒙古北方重型汽车股份有限公司 | Emergency brake control device for electric transmission mining dump truck |
| CN104527628A (en) * | 2014-12-30 | 2015-04-22 | 郑州宇通重工有限公司 | Micro-motion function and hydraulic brake control system of wheeled dozer |
| CN110566521A (en) * | 2019-08-23 | 2019-12-13 | 安徽合力股份有限公司 | automatic explosion-proof fork truck hydraulic system of control |
| CN113650596A (en) * | 2021-09-16 | 2021-11-16 | 广西柳工机械股份有限公司 | Service braking system, control method and electric loader |
| CN113677577A (en) * | 2019-09-24 | 2021-11-19 | 日立建机株式会社 | Self-discharging vehicle |
| CN113682289A (en) * | 2021-09-28 | 2021-11-23 | 国能神东煤炭集团有限责任公司 | Support vehicle braking system and support vehicle |
| CN113928413A (en) * | 2021-11-29 | 2022-01-14 | 广州电力机车有限公司 | 60T pure electric mine watering lorry hydraulic system |
| CN115626149A (en) * | 2022-12-20 | 2023-01-20 | 北京少仕科技有限公司 | Hydraulic braking system for vehicle and control method |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103407442A (en) * | 2013-07-23 | 2013-11-27 | 内蒙古北方重型汽车股份有限公司 | Emergency brake control device for electric transmission mining dump truck |
| CN104527628A (en) * | 2014-12-30 | 2015-04-22 | 郑州宇通重工有限公司 | Micro-motion function and hydraulic brake control system of wheeled dozer |
| CN104527628B (en) * | 2014-12-30 | 2017-03-22 | 郑州宇通重工有限公司 | Micro-motion function and hydraulic brake control system of wheeled dozer |
| CN110566521A (en) * | 2019-08-23 | 2019-12-13 | 安徽合力股份有限公司 | automatic explosion-proof fork truck hydraulic system of control |
| CN110566521B (en) * | 2019-08-23 | 2024-05-10 | 安徽合力股份有限公司 | Automatic explosion-proof fork truck hydraulic system of control |
| CN113677577B (en) * | 2019-09-24 | 2023-07-25 | 日立建机株式会社 | Dump truck |
| CN113677577A (en) * | 2019-09-24 | 2021-11-19 | 日立建机株式会社 | Self-discharging vehicle |
| CN113650596A (en) * | 2021-09-16 | 2021-11-16 | 广西柳工机械股份有限公司 | Service braking system, control method and electric loader |
| CN113682289A (en) * | 2021-09-28 | 2021-11-23 | 国能神东煤炭集团有限责任公司 | Support vehicle braking system and support vehicle |
| CN113682289B (en) * | 2021-09-28 | 2022-05-20 | 国能神东煤炭集团有限责任公司 | Support vehicle braking system and support vehicle |
| CN113928413B (en) * | 2021-11-29 | 2023-06-09 | 广州电力机车有限公司 | 60T pure electric mine watering lorry hydraulic system |
| CN113928413A (en) * | 2021-11-29 | 2022-01-14 | 广州电力机车有限公司 | 60T pure electric mine watering lorry hydraulic system |
| CN115626149A (en) * | 2022-12-20 | 2023-01-20 | 北京少仕科技有限公司 | Hydraulic braking system for vehicle and control method |
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Application publication date: 20121010 |