CN203548652U - Disc type controllable brake device for coal mine - Google Patents
Disc type controllable brake device for coal mine Download PDFInfo
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- CN203548652U CN203548652U CN201320599399.0U CN201320599399U CN203548652U CN 203548652 U CN203548652 U CN 203548652U CN 201320599399 U CN201320599399 U CN 201320599399U CN 203548652 U CN203548652 U CN 203548652U
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Abstract
The utility model relates to a disc type controllable brake device for a coal mine. The disc type controllable brake device comprises a hydraulic control system, an electric control system, a brake disc and brake oil cylinders, wherein the hydraulic control system controls the brake oil cylinders, the brake oil cylinders control the brake disc, the hydraulic control system is electrically connected with the electric control system, the electric control system is respectively connected with a pressure sensor, a distance sensor, an electromagnetic ball valve, an electromagnetic reversing valve, a proportioning overflow valve and a UPS (uninterrupted power supply), the hydraulic control system adopts a symmetrical double-loop form for standby, the number of the brake oil cylinders is two pairs or several pairs, and the brake oil cylinders are respectively arranged on a brake oil cylinder seat, the two pairs or several pairs of brake oil cylinders are distributed at the two sides of the brake disc, and the brake disc is arranged on a brake disc base. The disc type controllable brake device for the coal mine mainly has the advantages that an electro-hydraulic proportional control system is adopted, the goal of precisely controlling the brake moment can be reached in the actual brake process, in the normal starting work process of the system, the pressure maintaining of the hydraulic system is realized through a ball valve, the work reliability of the device is improved, the energy is saved, the environment is protected, and the great-brake-force oil cylinders are adopted.
Description
Technical field
The utility model relates to a kind of controllable braking device, particularly relates to a kind of employing electro-hydraulic proportional control system, can in actual braking process, reach the colliery disc type controllable braking device of accurate control braking moment.
Background technique
The disk type braker using on colliery is the braking device that relies on oil pressure in oil cylinder and belleville spring acting in conjunction to make to produce between brake shoe and brake disc friction catch torque, to utilize hydraulic oil compression dish spring to declutch, after release, dish spring produces the Normally closed type braking device that pressure is executed lock, there is the car of determining function, during system dead electricity, still can reliably brake, its working principle is by brake cylinder, brake disc to be applied to braking force to produce friction catch torque, by hydraulic control system, adjust the size of oil pressure in brake cylinder and adjust brake positive pressure, thereby the size of adjusting brake moment.
The disk type braker using on domestic colliery mainly acts on control oil pressure by throttle valve and relief valve simultaneously, thereby controls braking moment.During system works, Hydraulic System Oil pump motor is often opened.The product braking moment of domestic current application is less.
The disk type braker using on external colliery is pressure-retaining system, and during system works, hydraulic system is circuit-breaker oil pump motor according to circumstances, energy saving.But control system is simple.Can not accuracy-control system braking moment change.
Model utility content
For the problems referred to above, main purpose of the present utility model is to provide a kind of employing electro-hydraulic proportional control system, can in actual braking process, reach the colliery disc type controllable braking device of accurate control braking moment.
The utility model solves above-mentioned technical problem by following technical proposals: a kind of colliery disc type controllable braking device, described device comprises hydraulic control system, automatical control system, brake disc, brake cylinder, hydraulic control system is controlled brake cylinder, brake cylinder is controlled brake disc, hydraulic control system is electrically connected to automatical control system, automatical control system difference Bonding pressure sensor and range sensor, Solenoid ball valve, solenoid directional control valve, proportional pressure control valve, Oil pump electrical machinery, ups power.
In specific embodiment of the utility model: described hydraulic control system adopts for standby symmetrical double loop form.
In specific embodiment of the utility model: in the double loop of described hydraulic control system, wherein first loop comprises coarse oil filter, oil pump, motor, essence oil purifier, one-way valve, accumulator, pressure gauge, Solenoid ball valve, solenoid directional control valve, proportional pressure control valve, the first relief valve, the second relief valve, throttle valve, pressure transducer and two-position three way ball valve, wherein, one end of coarse oil filter and oil pump is connected, and oil pump adopts Electric Machine Control, and the other end of oil pump connects smart oil purifier, and the other end of smart oil purifier connects one-way valve, proportional pressure control valve, the second relief valve and throttle valve be connected with same one end solenoid directional control valve, the other end of solenoid directional control valve is connected on Solenoid ball valve, the other end of Solenoid ball valve is connected with pressure transducer, one end away from smart oil purifier of one-way valve and Solenoid ball valve link together away from one end of solenoid directional control valve, the one end linking together is connected with accumulator, accumulator is also connected with the first relief valve, pipeline between accumulator and the first relief valve connect is divided into two-way, be connected with on the way pressure gauge, another road is connected between Solenoid ball valve and pressure transducer, and the connection in first loop all adopts pipeline to connect,
Structure and annexation full symmetric in the double loop of described hydraulic control system in another loop and first loop, adopt two-position three way ball valve to connect between two loops.
In specific embodiment of the utility model: described brake cylinder comprises that plural number is right, be installed on brake cylinder seat, plural number is distributed in the both sides of brake disc to brake cylinder, and brake disc is arranged on brake disc base.
Positive progressive effect of the present utility model is: the colliery that the utility model provides has the following advantages with disc type controllable braking device: be mainly to adopt electro-hydraulic proportional control system, can in actual braking process, reach the object of accurate control braking moment.Meanwhile, when system normal boot-strap is worked, by ball valve, realize hydraulic system pressurize, improve the functional reliability of device, energy-conserving and environment-protective.Mechanical structure aspect, design adopts the hydraulic jack of large braking force.The utlity model has reliable, multiple functional, energy-conservation, have multiple protection functions, have the features such as reliable power failure brake measure.
Accompanying drawing explanation
Fig. 1 is the general structure schematic diagram of disc type controllable braking device for colliery.
Fig. 2 is the schematic diagram of hydraulic control system.
Fig. 3 is the structural representation of mechanical device.
Embodiment
Below in conjunction with accompanying drawing, provide the utility model preferred embodiment, to describe the technical solution of the utility model in detail.
Fig. 1 is the general structure schematic diagram of disc type controllable braking device for colliery.As shown in Figure 1: this applicable novel hydraulic control system, automatical control system, brake disc, brake cylinder of comprising, hydraulic control system is controlled brake cylinder, brake cylinder is controlled brake disc, hydraulic control system is electrically connected to automatical control system, automatical control system difference Bonding pressure sensor and range sensor, Solenoid ball valve, solenoid directional control valve, proportional pressure control valve, Oil pump electrical machinery, ups power.
Fig. 2 is the schematic diagram of hydraulic control system, and hydraulic control system adopts for standby symmetrical double loop form.In the double loop of hydraulic control system, wherein first loop comprises coarse oil filter 1, oil pump 2, motor 3, essence oil purifier 4, one-way valve 5, accumulator 6, pressure gauge 7, Solenoid ball valve 8, solenoid directional control valve 9, proportional pressure control valve 10, the first relief valve 11, the second relief valve 12, throttle valve 13, pressure transducer 14 and two-position three way ball valve 15, wherein, coarse oil filter 1 is connected with one end of oil pump 2, and oil pump 2 adopts motor 3 to control, and the other end of oil pump 2 connects smart oil purifier 4, and the other end of smart oil purifier 4 connects one-way valve 5, proportional pressure control valve 10, the second relief valve 12 and throttle valve 13 be connected with same one end solenoid directional control valve 9, the other end of solenoid directional control valve 9 is connected on Solenoid ball valve 8, the other end of Solenoid ball valve 8 is connected with pressure transducer 14, one end away from smart oil purifier 4 of one-way valve 5 and Solenoid ball valve 8 link together away from one end of solenoid directional control valve 9, the one end linking together is connected with accumulator 6, accumulator 6 is also connected with the first relief valve 11, pipeline between accumulator 6 and the first relief valve 11 connect is divided into two-way, be connected with on the way pressure gauge 7, another road is connected between Solenoid ball valve 8 and pressure transducer 14, and the connection in first loop all adopts pipeline to connect, structure and annexation full symmetric in the double loop of hydraulic control system in another loop and first loop, adopt two-position three way ball valve 15 to connect between two loops.
Fig. 3 is the structural representation of mechanical device.In the utility model, brake cylinder 400 comprises two pairs, is installed on brake cylinder seat 100, and two pairs of brake cylinders 400 are distributed in the both sides of brake disc 200, and brake disc 200 is arranged on brake disc base 300.
The in-built multi-disc belleville spring of brake cylinder, provides braking required positive pressure.For fear of producing additional axial force, brake cylinder is arranged in brake disc bilateral symmetry.When brake disc is applied to this positive pressure, on brake disc surface, produce friction brake force and then produce braking moment.By electro-hydraulic proportional valve in hydraulic control system, adjust the size of oil pressure in brake cylinder and can adjust positive pressure, thus the size of adjusting brake moment.
The 16Mn that brake disc employing has good combination property is material, uses for reference the design theory of centrifugal blower in structural design, offers curve vent air pipe in brake disc.When brake disc rotates, air-flow longitudinal flow is crossed ventilation flue surface, thereby produces forced convection heat radiation, is conducive to the heat radiation of brake disc.Known according to research, than solid brake disc, adopt air duct structure can effectively improve the heat dispersion of brake disc.
Brake block has adopted without asbestos environment protection type brake shoe, and this type of brake shoe has now been widely used on coal mining elevator.This friction coefficient of brake shoe is high, and mechanical strength is good, and heat fade effect wears away lowly, and life cycle is long; Brake shoe material is not containing high hardness rubbing agent and steel wool, in service without high frequency noise, do not produce spark, not easy damaged Pan Zha; In material, do not contain asbestos, environmental protection.This type of brake shoe is the desirable parts that are applied in the disc type controllable braking device in the operating mode of colliery.
The effect of hydraulic control system is exactly the size according to needed braking moment, carrys out the operating oil pressure of adjustable brake oil cylinder by electro-hydraulic proportional valve wherein, makes it to obtain a suitable oil pressure.Native system has adopted electro-hydraulic proportional pressure control, can realize stepless voltage regulation, make to boost, step-down process steadily and rapidly, improved the performance of system.Fig. 3 is hydraulic control system schematic diagram.
At brake shoe, open, in Belt Conveyors normal course of operation, the now Oil pump electrical machinery of this hydraulic system shutdown, Solenoid ball valve energising, system enters packing state.Along with reasons such as leakages, to a certain extent, in automatical control system, PLC control system will be opened Oil pump electrical machinery to the pressure decreased of system, to system, suppress.When system pressure is elevated to after setting value, control system will be closed Oil pump electrical machinery.So, in native system, Oil pump electrical machinery need not be started shooting at work always, has not only saved electric energy, and has greatly improved the reliability of system.
In system, adopted the accumulator with larger volume, it is the oil pressure of maintenance medium pressing system fully.In system, in packing state, when Oil pump electrical machinery is shut down, it can make up the reduction of the system oil pressure causing due to reasons such as leakages.In system, during in braking state, now Oil pump electrical machinery is not started shooting, and accumulator is as the braking work of emergency power source input coefficient, and its larger volume has been guaranteed the reliable braking of system.
Hydraulic control system takes double loop form to guarantee security of operation, not only can be standby but also be convenient to safeguard.
Automatical control system is used for controlling hydraulic system, utilizes explosion-proof tank to realize downhole anti-explosion function, is suitable for the operating mode under coal mine.Its principle is that PLC accepts the signal that start, braking instruction and each protective gear (sensor) feed back, and controls hydraulic system complete desired action according to the program of prior input.Simultaneously this braking device can also with conveyor host communication, thereby can realize long-range monitoring.
In production application, the controlled braking of Belt Conveyors realizes by controlling the braking moment of braking device.Therefore, the yardstick of weighing Belt Conveyors braking system functional reliability is exactly braking moment, and the size of braking moment has very large relation with friction coefficient of brake shoe, because the braking moment of native system is to produce by the friction between brake shoe and brake disc, therefore brake shoe is worn the increase that will cause brake clearance, and the fatigue due to belleville spring also can cause the increase of brake clearance equally.Under same oil pressure, may cause like this minimizing of positive pressure, this will cause the minimizing of braking moment.Therefore, native system has adopted range sensor to monitor in real time the gap between brake block abrasion amount and brake shoe and brake disc, and is furnished with auto alarm system, notify attendant brake shoe is changed or the gap between brake shoe and brake disc is regulated, guaranteed the reliable and stable of Braking system.
Because Disk brake apparatus is mainly used in downward belt conveyor, the particularity of coal production there is the possibility of power failure.Downward belt conveyor in working, if run into power failure, due to system material inertia and the inertia of self very large, more need safety brake.Native system has adopted dual measure to guarantee the braking of safety under power failure operating mode: first, in automatical control system, adopted ups power, guarantee under power down mode, still can power to each solenoid valve in control system, by controlling electromagnetic proportional valve, guarantee the normal reduction of oil pressure, the braking moment of control system, has guaranteed the braking deceleration of system; Second, if in the situation that ups power lost efficacy, all solenoid valve is in off-position, cannot carry out work, system still can, by urgent oil hydraulic circuit, under the synergy of relief valve and throttle valve and accumulator, guarantee the subsides lock oil pressure of brake shoe and control the release time, also can realize two stage braking, guarantee the safety of system.
Working principle of the present utility model is as follows: according to this disc type controllable braking device of applying working condition, have following several working procedure.
1, the process that declutches
Hydraulic control system is received and is declutched after instruction, oil pump 2 work, solenoid directional control valve 9 energisings.Proportional pressure control valve 10 electric currents increase gradually, and oil pressure rises, accumulator 6 topping ups, and brake braking force square reduces, Belt Conveyors slow start under load drives.At system pressure, reach after maximum Solenoid ball valve 8 energisings, system lock.In Belt Conveyors course of normal operation, system pressurize, owing to leaking when oil pressure is reduced to the minimum pressure of setting, PLC sends signal, and Oil pump electrical machinery start is suppressed, and system pressure raises; When oil pressure is elevated to the maximum pressure of PLC setting, PLC sends signal, and Oil pump electrical machinery is shut down.The first relief valve 11 initialization system maximum pressures, play safety valve effect.
2, orderly shutdown
Hydraulic control system is accepted after orderly shutdown instruction, Solenoid ball valve 8 power-off.Because solenoid directional control valve 9 is in electriferous state, 10 releases of fluid passing ratio relief valve.The electric current of proportional pressure control valve reduces to regulate oil pressure and braking moment by the requirement of automatical control system, makes conveyor parking retardation remain on 0.1～0.3m/s
2.After conveyor is out of service, Oil pump electrical machinery 3, solenoid directional control valve 9 and proportional pressure control valve 10 power-off, system quits work.
3, service braking
In conveyor running, if cause for a certain reason hypervelocity, the tachogenerator of Belt Conveyors reaches automatical control system by signal, and automatical control system sends control signal, make Solenoid ball valve 8 power-off, fluid is by proportional pressure control valve release, and proportional pressure control valve current reduction, applies braking force, when machine to be conveyed reaches stable operation speed, Solenoid ball valve 8 energisings, brake off, system pressurize.
4, System Sudden power-off I
When the unexpected power-off of conveyer system, motor 3 power-off, but control system provides power supply by UPS, and Solenoid ball valve 8, solenoid directional control valve 9 and proportional pressure control valve 10 are still subject to PLC electric control system controls.Now, Solenoid ball valve 8 power-off, fluid, by proportional pressure control valve 10 releases, applies braking force, makes the steady retarding braking of conveyor.
5, System Sudden power-off II
When the unexpected power-off of conveyer system, in the situation that ups power lost efficacy, Oil pump electrical machinery 3, Solenoid ball valve 8, solenoid directional control valve 9 and proportional pressure control valve 10 power-off, system makes oil pressure be down to setting through the second relief valve 12 effects, break is labelled to brake disc by idle stroke rapidly, and under the synergy of accumulator and throttle valve 13, oil liquid pressure reduces gradually, braking moment increases, and conveyor slowly stops.
6, system emergency braking
When receiving, conveyor stops in emergency after instruction, control procedure is consistent with orderly shutdown process, than orderly shutdown state, proportional pressure control valve 10 stress-relief process are rapider, to reach the object under the requirement that meets safety regulations in coal mine, conveyor being stopped as early as possible.
System has taked double loop to guarantee the safe and reliable of work, and Dang Yi road hydraulic system breaks down, and can be switched on another loop, road by two-position three way ball valve 15, guarantees the normal work of whole system.
More than show and described basic principle of the present utility model and major character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present utility model; do not departing under the prerequisite of the utility model spirit and scope; the utility model also has various changes and modifications; these changes and improvements all fall within the scope of claimed the utility model, and the claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (4)
1. a colliery disc type controllable braking device, it is characterized in that: described device comprises hydraulic control system, automatical control system, brake disc, brake cylinder, hydraulic control system is controlled brake cylinder, brake cylinder is controlled brake disc, hydraulic control system is electrically connected to automatical control system, automatical control system difference Bonding pressure sensor and range sensor, Solenoid ball valve, solenoid directional control valve, proportional pressure control valve, ups power.
2. colliery according to claim 1 disc type controllable braking device, is characterized in that: described hydraulic control system adopts for standby symmetrical double loop form.
3. colliery according to claim 2 disc type controllable braking device, is characterized in that: in the double loop of described hydraulic control system, wherein first loop comprises coarse oil filter, oil pump, motor, essence oil purifier, one-way valve, accumulator, pressure gauge, Solenoid ball valve, solenoid directional control valve, proportional pressure control valve, the first relief valve, the second relief valve, throttle valve, pressure transducer and two-position three way ball valve, wherein, one end of coarse oil filter and oil pump is connected, and oil pump adopts Electric Machine Control, and the other end of oil pump connects smart oil purifier, and the other end of smart oil purifier connects one-way valve, proportional pressure control valve, the second relief valve and throttle valve be connected with same one end solenoid directional control valve, the other end of solenoid directional control valve is connected on Solenoid ball valve, the other end of Solenoid ball valve is connected with pressure transducer, one end away from smart oil purifier of one-way valve and Solenoid ball valve link together away from one end of solenoid directional control valve, the one end linking together is connected with accumulator, accumulator is also connected with the first relief valve, pipeline between accumulator and the first relief valve connect is divided into two-way, be connected with on the way pressure gauge, another road is connected between Solenoid ball valve and pressure transducer, and the connection in first loop all adopts pipeline to connect,
Structure and annexation full symmetric in the double loop of described hydraulic control system in another loop and first loop, adopt two-position three way ball valve to connect between two loops.
4. colliery according to claim 1 disc type controllable braking device, is characterized in that: described brake cylinder comprises that plural number is right, and be installed on brake cylinder seat, plural number is distributed in the both sides of brake disc to brake cylinder, and brake disc is arranged on brake disc base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320599399.0U CN203548652U (en) | 2013-09-26 | 2013-09-26 | Disc type controllable brake device for coal mine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320599399.0U CN203548652U (en) | 2013-09-26 | 2013-09-26 | Disc type controllable brake device for coal mine |
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| CN203548652U true CN203548652U (en) | 2014-04-16 |
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| CN201320599399.0U Expired - Fee Related CN203548652U (en) | 2013-09-26 | 2013-09-26 | Disc type controllable brake device for coal mine |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105156523A (en) * | 2015-10-07 | 2015-12-16 | 山西汾西矿业（集团）有限责任公司 | Disc brake hydraulic control device of main inclined shaft belt type conveyor and control method for disc brake hydraulic control device |
| CN105822694A (en) * | 2015-01-04 | 2016-08-03 | 洛阳中重自动化工程有限责任公司 | Multifunctional braking device for mill |
| CN106763314A (en) * | 2017-01-05 | 2017-05-31 | 中国神华能源股份有限公司 | Brake apparatus and brake fluid system |
| CN108488277A (en) * | 2018-05-29 | 2018-09-04 | 凯盛重工有限公司 | A kind of hydraulic system of mining brake shuttle tram |
| CN108760190A (en) * | 2018-08-08 | 2018-11-06 | 中车洛阳机车有限公司 | A kind of solenoid valve air-tight test closed system |
| CN108953433A (en) * | 2018-11-01 | 2018-12-07 | 江苏新瑞重工科技有限公司 | Cradle-type turntable brake gear Anti-fall hydraulic pressure maintaining unit and its working method |
| CN109751273A (en) * | 2019-01-09 | 2019-05-14 | 中煤科工集团重庆研究院有限公司 | Brake simulation test method and device for mine ventilator |
| CN110081037A (en) * | 2019-03-22 | 2019-08-02 | 中国煤炭科工集团太原研究院有限公司 | Have the accumulator of self-checking function quick stable-pressure device and application method automatically concurrently |
| CN111252701A (en) * | 2020-03-05 | 2020-06-09 | 安徽宇锋仓储设备有限公司 | Electronic brake system for forklift |
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2013
- 2013-09-26 CN CN201320599399.0U patent/CN203548652U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105822694A (en) * | 2015-01-04 | 2016-08-03 | 洛阳中重自动化工程有限责任公司 | Multifunctional braking device for mill |
| CN105156523A (en) * | 2015-10-07 | 2015-12-16 | 山西汾西矿业（集团）有限责任公司 | Disc brake hydraulic control device of main inclined shaft belt type conveyor and control method for disc brake hydraulic control device |
| CN106763314A (en) * | 2017-01-05 | 2017-05-31 | 中国神华能源股份有限公司 | Brake apparatus and brake fluid system |
| CN108488277A (en) * | 2018-05-29 | 2018-09-04 | 凯盛重工有限公司 | A kind of hydraulic system of mining brake shuttle tram |
| CN108488277B (en) * | 2018-05-29 | 2024-03-26 | 凯盛重工有限公司 | Hydraulic system of mining braking shuttle car |
| CN108760190A (en) * | 2018-08-08 | 2018-11-06 | 中车洛阳机车有限公司 | A kind of solenoid valve air-tight test closed system |
| CN108953433A (en) * | 2018-11-01 | 2018-12-07 | 江苏新瑞重工科技有限公司 | Cradle-type turntable brake gear Anti-fall hydraulic pressure maintaining unit and its working method |
| CN108953433B (en) * | 2018-11-01 | 2019-02-05 | 江苏新瑞重工科技有限公司 | Cradle-type turntable brake gear Anti-fall hydraulic pressure maintaining unit and its working method |
| CN109751273A (en) * | 2019-01-09 | 2019-05-14 | 中煤科工集团重庆研究院有限公司 | Brake simulation test method and device for mine ventilator |
| CN109751273B (en) * | 2019-01-09 | 2020-08-04 | 中煤科工集团重庆研究院有限公司 | Brake simulation test method and device for mine ventilator |
| CN110081037A (en) * | 2019-03-22 | 2019-08-02 | 中国煤炭科工集团太原研究院有限公司 | Have the accumulator of self-checking function quick stable-pressure device and application method automatically concurrently |
| CN111252701A (en) * | 2020-03-05 | 2020-06-09 | 安徽宇锋仓储设备有限公司 | Electronic brake system for forklift |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHINA COAL TECHNOLOGY ENGINEERING GROUP SHANGHAI C Free format text: FORMER NAME: SHANGHAI ANYUN TRANSPORT EQUIPMENT CO., LTD. |
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| CP03 | Change of name, title or address |
Address after: 200433 Yangpu District, Wu Dong Road, room 198, No. 808, room Patentee after: Shanghai Co., Ltd of Zhong Meike work group Patentee after: CHINA COAL TECHNOLOGY & ENGINEERING GROUP SHANGHAI RESEARCH INSTITUTE Address before: 201401 Shanghai city Fengxian District Wu Tang Lu No. 369 Building 2 Room 501 Patentee before: SHANGHAI ANYUN TRANSPORT EQUIPMENT CO., LTD. Patentee before: CHINA COAL TECHNOLOGY & ENGINEERING GROUP SHANGHAI RESEARCH INSTITUTE |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140416 Termination date: 20160926 |