CN105170366A - Fluid closed loop flow control system - Google Patents
Fluid closed loop flow control system Download PDFInfo
- Publication number
- CN105170366A CN105170366A CN201510420252.4A CN201510420252A CN105170366A CN 105170366 A CN105170366 A CN 105170366A CN 201510420252 A CN201510420252 A CN 201510420252A CN 105170366 A CN105170366 A CN 105170366A
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- Prior art keywords
- fluid
- flow
- flowmeter
- control system
- closed loop
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
- B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
- B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
- B05B9/047—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump supply being effected by follower in container, e.g. membrane or floating piston, or by deformation of container
Abstract
The invention discloses a fluid closed loop flow control system. The fluid closed loop flow control system comprises a fluid conveying system, a fluid flowmeter, a fluid flow adjusting module, a spraying tool and a control system; the fluid conveying system, the fluid flowmeter, the fluid flow adjusting module and the spraying tool are connected together through a fluid pipe, fluid is conveyed to the fluid flowmeter from the fluid conveying system, passes through an outlet of the fluid flowmeter to be conveyed to the fluid flow adjusting module, and is then conveyed to the spraying tool; a fluid material is conveyed to the inlet end of the fluid flowmeter through the fluid conveying system, a fluid one-way valve is arranged at the inlet end of the fluid flowmeter, the fluid material enters the fluid flowmeter through the fluid one-way valve, and the fluid one-way valve is used for preventing large fluid pulses from influencing the metering accuracy of the fluid flowmeter; and the fluid one-way valve supplies one-way stable fluid flow to the fluid flowmeter, the fluid material is conveyed to the flow adjusting module from the fluid flowmeter, and detected fluid flow data detected by the fluid flowmeter are conveyed to the control system. According to the fluid closed loop flow control system, two modes including the flow closed loop and the pressure closed loop are adopted, the accurate flow control is guaranteed through the flow closed loop, and rapid responses of flow control are provided through the pressure closed loop; in addition, a Coriolis mass flowmeter is adopted, so that the prior defects of abrasion of a metering cylinder and a gear pump, not thorough washing, large device maintenance working amount are avoided, the efficiency of spraying operation is improved, and the overall spraying operation is more perfect.
Description
Technical field
The invention belongs to paint spraying and gluing industry, be specifically related to a kind of fluid closed loop flow control system.
Background technology
In recent years, in paint spraying and gluing industrial production, turn to automatic spraying operation from manual work, automatic spraying operation just relates to the process control of fluid flow, if there is no precise and stable fluid flow control system, just be difficult to guarantee that the external coating of product requires and causes the waste of coating, and the fluid flow that market uses now controls mainly to adopt following two kinds of modes, one adopts long-range coating pressure regulator valve to carry out coating pressure adjustment, thus change the flow velocity of fluid nozzle, reach the control of fluid flow, this mode does not have the checkout gear of flow, fluid pressure and fluid flow neither linear relationships, in production engineering, coating device for suction material or dope viscosity because of time factor change time, flow changes thereupon, it is uneven that flow shakiness will be directed at coating, thus external coating requirement can not be met, the second adopts the equipment such as metering cylinder and gear pump to carry out detect control fluid flow, but in use, metering cylinder and gear pump are power set, metering cylinder is by air pressure or motor pushing, gear pump is driven by motor, and when to occur in wearing and tearing or carrier pipe without paint or have a gas ingredients, flow will be made mistakes, according to the principle of metering cylinder and gear pump, the all necessary compact sealing in inside, this will cause quick abrasion, and maintenance cost is high, scavenging period is long, wastes more cleaning solvent, after the wearing and tearing of metering cylinder, gear pump, conveying and metering all will be caused to be forbidden, cause flow-control to make mistakes.
Therefore there is a lot of defect in existing fluid flow control system, needs to improve.
Summary of the invention
The present invention mainly for the shortcoming of fluid flow control system in the past, carries out fluid metering and structural improvement, to improve the combination property of fluid flow control system.
The object of the present invention is to provide fluid closed loop flow control system, be intended to the defect and the flow measurement control mode that solve existing fluid flow control system.
A kind of fluid closed loop flow control system, comprise fluid delivery system, flow measuring apparatus, fluid flow adjustment module, spray tool and control system composition, fluid delivery system, flow measuring apparatus, Flow-rate adjustment module and spray tool link together by fluid circuit, fluid is delivered to flowmeter from fluid delivery system, be delivered to Flow-rate adjustment module through flowmeter outlet, then be delivered to spray tool.
Fluid foods is delivered to flowmeter arrival end by fluid delivery system, the arrival end of flowmeter installs fluid non-return valve, fluid foods enters flowmeter again through check valve, fluid non-return valve prevents fluid pulsation large, affect the measuring accuracy of flowmeter, fluid non-return valve provides the fluid flow of one way stable to flowmeter, and fluid foods is delivered to Flow-rate adjustment module from flowmeter, and the fluid flow data of detection are transferred to control system by flowmeter.
Above-mentioned check valve inside is made up of a spring and a stainless steel ball, and when forward fluid flows through, fluid promotes ball from ball direction, ball promotes spring, and when fluid pressure is greater than spring force, ball will not pushed open, ball and valve will be unlocked, and forward fluid passes through; During counter fluid, fluid flows to ball from spring direction, and spring withstands ball, ball bearing against valve, and retrograde fluid pressures is larger, and ball is connected tightr with valve, and counter fluid is ended.
Above-mentioned fluid detection flowmeter adopts Coriolis profit mass flowmenter, and Coriolis profit mass flowmenter is the delicate flow detection realizing fluid according to Coriolis (CoriolisForce) principle, Coriolis profit mass flowmenter inside is two stainless steel fluid circuits, in the middle of pipeline, a high-frequency electromagnetic oscillator is installed, and higher frequency sensor is installed at the two ends of fluid hose, when fluid flow through pipe, the frequency that pipeline two ends are detected can produce different phase differences according to the size of flow, Coriolis profit mass flowmenter central processing system exports to closed loop flow control system by calculating corresponding flow to the phase difference detected, closed loop flow control system carrys out control flow check adjustable valve according to the flow of the actual flow correspondence system setting that flowmeter feeds back, thus reach within the scope of actual flow or allowable error equal with default flow.
Above-mentioned Flow-rate adjustment module is made up of fluid pressure pressure regulator valve, electric Proportion valve, fluid pressure transmitter, fluid pressure pressure regulator valve, electric Proportion valve, fluid pressure transmitter are closely integrated on fluid manifold by Flow-rate adjustment module, fluid foods is delivered to Flow-rate adjustment module inlet through flowmeter, through the fluid pressure valve of Flow-rate adjustment module to Flow-rate adjustment module outlet, then be delivered to spray tool through fluid circuit.
The fluid pressure pressure regulator valve of above-mentioned Flow-rate adjustment module is by a set of air diaphragm, a set of coating diaphragm, , a spring, a stainless steel ball composition, electric Proportion valve is together with the air diaphragm integrated installation of fluid pressure pressure regulator valve, system promotes pressure regulator valve air diaphragm by the air pressure controlling electric Proportion valve, coating diaphragm is promoted again by air diaphragm, coating diaphragm promotes stainless steel ball, valve opening, fluid exports through flow direction valve, air pressure is larger, valve opening is larger, on the contrary, when closing electric Proportion valve and exporting, stainless steel ball under spring force, valve-off, thus control fluid flow pressure regulator valve by controlling electric Proportion valve, reach the control of fluid flow.
The fluid pressure transmitter of above-mentioned Flow-rate adjustment module is arranged in the outlet manifold of fluid pressure pressure regulating valve, be used for detecting the fluid pressure between Flow-rate adjustment module to spray tool in fluid circuit, and with analog signal, pressure data is transferred to control system, the fluid pressure signal that control system is fed back according to pressure transmitter and the flow that the flow signal correspondence system that flowmeter feeds back sets carry out control flow check adjustable valve, thus reach dual closed loop flow and control.
Beneficial effect, in the present invention, adopt flow closed loop and pressure closed loop two kinds of modes, flow closed loop ensure that accurate flow-control, pressure closed loop provides the quick loud shadow of flow-control, and the wearing and tearing of metering cylinder and gear pump before adopting Coriolis profit mass flowmenter to overcome, cleaning not thoroughly, shortcoming that corrective maintenance workload is large, improve the efficiency of spraying operation, make whole spraying operation more perfect.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of this fluid closed loop flow control system;
Fig. 2 is the structure chart of this fluid closed loop flow control system;
Fig. 3 is the Flow-rate adjustment function structure chart of this fluid closed loop flow control system;
Fig. 4 is the Flow-rate adjustment module map of this fluid closed loop flow control system;
Fig. 5 is the one-way valve structures figure of this fluid closed loop flow control system;
Fig. 6 is the flowmeter structure figure of this fluid closed loop flow control system;
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
As shown in Figure 1 and Figure 2, fluid closed loop flow control system comprises the composition such as electric control system 1, flow measuring apparatus 2, Flow-rate adjustment module 4, spray tool 5, fluid delivery pipeline 6, fluid delivery pipeline 12, stream carrier pipe 13, fluid non-return valve 15 and fluid delivery system 14;
As shown in Figure 1 and Figure 2, fluid foods is transported to fluid non-return valve 15 by fluid delivery system 14 and flows to flowmeter 2, be delivered to Flow-rate adjustment module 4 through fluid delivery pipeline 12 again, be delivered to spray tool by the fluid foods of Flow-rate adjustment module through fluid delivery pipeline 13;
As shown in Figure 1, fluid foods is through fluid delivery pipeline 6, fluid non-return valve 15 enters flowmeter 2, fluid flow in flowmeter 2 test fluid pipeline, and actual flow data are sent to electric control system 1, fluid foods enters the fluid pressure pressure regulator valve 3 of Flow-rate adjustment module 4 through fluid delivery pipeline 6 from flowmeter outlet, the actual flow data outputting analog signal that electric control system 1 is fed back according to the flow value of default and flowmeter, control the compressed air output pressure of electric Proportion valve 8, the output squeezing air push fluid pressure pressure regulator valve 3 of electric Proportion valve 8, fluid pressure pressure regulator valve 3 valve opening, fluid foods enters fluid delivery pipeline 13 and is delivered to spray tool 5, fluid pressure pressure regulator valve 3 exports installs fluid pressure transmitter 7, fluid foods pressure in fluid delivery pipeline 13 before fluid pressure transmitter 7 test fluid pressure adjusting pressuring valve 3 to spray tool 5, and transfer data to electric control system 1, the actual flow that flowmeter 2 feeds back by electric control system 1 and the fluid pressure that fluid pressure transmitter 7 feeds back and default flow calculate, export corresponding control simulation amount signal and control electric Proportion valve 8, the valve opening of fluid pressure adjusting pressuring valve 3 is controlled again by the compressed air pressure of electric Proportion valve 8, thus control the flow of fluid foods,
As shown in Fig. 1, Fig. 3, Fig. 4, Flow-rate adjustment module 4 is made up of fluid pressure pressure regulator valve 3, electric Proportion valve 8, fluid pressure transmitter 7 and fluid manifold 24, and wherein fluid pressure pressure regulator valve 3 is made up of spring 17, stainless steel ball 18, fluid diaphragm thimble 19, fluid diaphragm 20, air diaphragm 21, compressed air manifold 22 and compressed air inlet 23 again, fluid foods enters Flow-rate adjustment module 4 by the entrance 16 of Flow-rate adjustment module 4, the power effect of spring 17 promotes stainless steel ball 18 by valve closing, when closed loop flow control system turn-on flow rate, electric control system 1 exports control simulation signal to electric Proportion valve 8, electric Proportion valve 8 becomes compressed air pressure according to the intensity-conversion of control signal, air diaphragm 21 is promoted by compressed air manifold 22, air diaphragm 21 propelling fluid diaphragm 20, fluid diaphragm thimble 19 on fluid diaphragm 20 promotes to stainless steel ball 18 direction, when the motive force of fluid diaphragm thimble 19 is greater than spring 17 active force, stainless steel ball 18 moves to spring 17 direction, valve open, fluid foods flows to outlet 25 by valve and fluid discrimination block 24, the control simulation signal that electric control system 1 exports is larger, the control compressed air pressure of electric Proportion valve 8 is larger, the aperture of Fluid valve is also larger, flow also becomes large thereupon, thus reach the control overflow of fluid flow, the actual pressure data of fluid to the fluid pressure in the fluid circuit 13 sprayed between tool 5, and are transferred to electric control system 1 by the fluid pressure transmitter 7 test fluid pressure adjusting pressuring valve 3 that Flow-rate adjustment module 4 inside is installed,
As shown in Fig. 2, Fig. 5, fluid non-return valve 15 is installed on the arrival end of flowmeter 2, and fluid non-return valve 15 mainly prevents reverse fluid flow in fluid circuit, causes the fluid of flowmeter 2 inside to fluctuate, flow detection inaccuracy; The fluid foods entrance 26 of fluid non-return valve 15, fluid foods outlet 29, forward fluid foods is delivered to check valve internal valves through one-way valve inlet 26, when the pressure of fluid foods is greater than spring 27 pressure of check valve, fluid foods is through the stainless steel ball 28 of the pressure promotion check valve of self, and fluid foods is through flow direction valve outlet 29; When otherwise fluid foods oppositely flows into check valve inside from the outlet 29 of check valve, check valve is by the valve of the power effect of spring 27 by stainless steel ball 28 dieback check valve, add the power effect of counter fluid material again, the pressure of counter fluid material is larger, stainless steel ball 28 and valve top obtain tighter, thus preventing the adverse current of fluid foods, the measuring accuracy avoiding fluid flow is made mistakes;
As shown in Fig. 2, Fig. 6, this fluid closed loop flow control system adopts Coriolis profit mass flowmenter test fluid flow, flowmeter 2 inside is made up of two stainless steel fluid hoses 34, high-frequency electromagnetic vibrator 32 and frequency detecting sensor 31,33, fluid foods enters flowmeter from flowmeter entrance 30, is delivered to flowmeter outlet 35 through two stainless steel fluid hoses 34; Coriolis profit mass flowmenter is the vibration that high frequency is occurred by high-frequency electromagnetic vibrator 32, the frequency at stainless steel fluid hose two ends is detected by the frequency detecting sensor 31,33 at flowmeter two ends, when there being material flow out-of-date, the detection frequency of frequency detecting sensor 31,33 can produce phase difference, the time of phase difference is then determined according to the size of flow, thus the calculated flow rate meter phase difference time calculates the flow of fluid foods, and be transferred to electric control system 1;
Embodiment 2
As Fig. 1, shown in Fig. 2, when this fluid closed loop flow control system enters spray coating operations, fluid foods is delivered to flowmeter 2 through fluid delivery system 1, Flow-rate adjustment module 4 is delivered to again through flowmeter 2, fluid foods after regulating is transported to spray tool 5 and enters spraying operation, the flow of flowmeter 2 test fluid material constantly, and the data on flows that reality detects is transferred to electric control system 1, fluid pressure transmitter 7 detects the fluid pressure between Flow-rate adjustment module 4 to spray tool 5, and the fluid pressure data that reality detects is transferred to electric control system 1, electric control system 1 is according to flow detection data and pressure detection data, and carry out ratio calculating with the flow value of default, export control simulation amount signal and control electric Proportion valve, and then control fluid pressure adjusting pressuring valve 3, control fluid flow equal with default flow or within allowed band, thus meet the accurate control overflow of spraying flow.
This fluid closed loop flow control system adopts flow and pressure dual to detect, fluid detection flowmeter 2 provides accurate actual fluid flow data, fluid pressure transmitter 7 provides fluid pressure data constantly, and duplex feedback data ensure accurate control and the fast-response control of fluid flow;
Embodiment 3
As Fig. 1, shown in Fig. 2, this fluid closed loop flow control system is by electric control system 1, flowmeter 2, Flow-rate adjustment module 4, spray tool 5 and fluid delivery pipeline composition, its Flow-rate adjustment module comprises fluid pressure pressure regulator valve 3, electric Proportion valve 8, parts such as fluid pressure transmitter 7 grade form, use scene, electric control system 1, flowmeter 2, Flow-rate adjustment module 4 and spray tool are installed separately, electric control system 1 is arranged in the annex safety zone of equipment use, flowmeter 2 is arranged on the correct position that equipment use place is not shaken, Flow-rate adjustment module 4 is arranged on the close spray tool position of automatic spraying equipment, middle by cable or fluid delivery pipeline connection.
Claims (6)
1. a fluid closed loop flow control system, its feature comprises:
A kind of fluid closed loop flow control system have employed electric control system, fluid delivery system, fluid non-return valve, flowmeter, Flow-rate adjustment module, spray tool, and connecting together by fluid delivery pipeline, its Flow-rate adjustment module comprises fluid pressure pressure regulator valve, electric Proportion valve, fluid pressure transmitter;
Fluid foods is delivered to spray tool through fluid delivery system, fluid non-return valve, flowmeter, Flow-rate adjustment module;
Control system gathers the double data of fluid flow and fluid pressure, and frame of reference setting data on flows, export corresponding control simulation signal and control electric Proportion valve, and then control fluid pressure adjusting pressuring valve, thus control fluid flow, make that actual fluid flow is equal with default flow or within the error stream weight range allowed, flow-control scope is 20-3800 milliliter per minute.
2. a fluid closed loop flow control system, it is characterized in that adopting integrated Flow-rate adjustment module and diaphragm-type pressure regulating valve, pressure regulator valve adopts fluid diaphragm to add air diaphragm duplex film sheet and controls, air diaphragm and fluid diaphragm adopt 4:1 to design, make flow-control more accurate, electric Proportion valve, together with pressure regulator valve air diaphragm integrated installation, accelerates the response speed of flow-control.
3. a fluid closed loop flow control system, it is characterized in that adopting integrated Flow-rate adjustment module, by fluid pressure regulator valve, electric Proportion valve, fluid pressure transmitter and without dead angle fluid manifold install integrate, shorten connecting line, reduce scavenging period, Flow-rate adjustment module volume is little, easy to maintenance, the position of spraying equipment near spray tool can be installed on, accelerate the response speed of flow-control.
4. a fluid closed loop flow control system, is characterized in that adopting Coriolis profit mass flowmenter, and Coriolis profit mass flowmenter is the delicate flow detection realizing fluid according to Coriolis (CoriolisForce) principle, Coriolis profit mass flowmenter inside is two stainless steel fluid circuits, in the middle of pipeline, a high-frequency electromagnetic oscillator is installed, and higher frequency sensor is installed at the two ends of fluid hose, when fluid flow through pipe, the frequency that pipeline two ends are detected can produce different phase differences according to the size of flow, Coriolis profit mass flow statistical processing system is by calculating corresponding flow to the phase difference detected, according to principle and the internal structure of Coriolis profit mass flowmenter, flowmeter is to the temperature of charge detected, viscosity and material particles composition are not strict with, wide to the scope of application of material, flow detection is accurate, clean without the need to dismounting, by fluid circuit solvent clean.
5. a fluid closed loop flow control system, it is characterized in that adopting fluid non-return valve, design and installation, in the arrival end of flowmeter, prevents material adverse current, cause flowmeter internal flow unstable, and then fluid flow measures the phenomenons such as mistake.
6. a fluid closed loop flow control system, is characterized in that adopting explosion-proof flowmeter and Flow-rate adjustment module, meets and use in inflammable and explosive environment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510420252.4A CN105170366A (en) | 2015-07-17 | 2015-07-17 | Fluid closed loop flow control system |
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| CN201510420252.4A CN105170366A (en) | 2015-07-17 | 2015-07-17 | Fluid closed loop flow control system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106042216A (en) * | 2016-07-15 | 2016-10-26 | 湖北三江航天红阳机电有限公司 | Glue solution spray mechanism |
| CN107251821A (en) * | 2017-07-11 | 2017-10-17 | 贵港市鼎金电子产品有限公司 | A kind of agricultural film film covering device sprinkled water |
| CN107329501A (en) * | 2017-08-16 | 2017-11-07 | 深圳市泰达机器人有限公司 | One kind spraying flow closed-loop control system |
| CN108160361A (en) * | 2018-03-26 | 2018-06-15 | 中国工程物理研究院化工材料研究所 | For the automatic spray apparatus and control system and method for foaming structure part |
| CN108718495A (en) * | 2018-07-03 | 2018-10-30 | 郑州立佳热喷涂机械有限公司 | The thermal spraying fuel spraying control system and control method of closed-loop automation control |
| CN109667973A (en) * | 2019-01-16 | 2019-04-23 | 苏州仁甬得物联科技有限公司 | A kind of high-precision flow valve control system |
| CN110531794A (en) * | 2019-08-30 | 2019-12-03 | 北京北方华创微电子装备有限公司 | Fluid pressure control device and method, cleaning solution supplying mechanism |
| CN110586017A (en) * | 2019-11-01 | 2019-12-20 | 常州市正元干燥工程有限公司 | Purifier |
| CN110989699A (en) * | 2019-12-25 | 2020-04-10 | 东莞市启晨自动化设备有限公司 | Low-shearing force precise flow control system |
| CN113486609A (en) * | 2021-07-05 | 2021-10-08 | 河南城建学院 | Fluid material conveying device and method based on hydrodynamics Bernoulli principle |
-
2015
- 2015-07-17 CN CN201510420252.4A patent/CN105170366A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106042216A (en) * | 2016-07-15 | 2016-10-26 | 湖北三江航天红阳机电有限公司 | Glue solution spray mechanism |
| CN107251821A (en) * | 2017-07-11 | 2017-10-17 | 贵港市鼎金电子产品有限公司 | A kind of agricultural film film covering device sprinkled water |
| CN107329501A (en) * | 2017-08-16 | 2017-11-07 | 深圳市泰达机器人有限公司 | One kind spraying flow closed-loop control system |
| CN108160361A (en) * | 2018-03-26 | 2018-06-15 | 中国工程物理研究院化工材料研究所 | For the automatic spray apparatus and control system and method for foaming structure part |
| CN108718495A (en) * | 2018-07-03 | 2018-10-30 | 郑州立佳热喷涂机械有限公司 | The thermal spraying fuel spraying control system and control method of closed-loop automation control |
| CN109667973A (en) * | 2019-01-16 | 2019-04-23 | 苏州仁甬得物联科技有限公司 | A kind of high-precision flow valve control system |
| CN110531794A (en) * | 2019-08-30 | 2019-12-03 | 北京北方华创微电子装备有限公司 | Fluid pressure control device and method, cleaning solution supplying mechanism |
| CN110586017A (en) * | 2019-11-01 | 2019-12-20 | 常州市正元干燥工程有限公司 | Purifier |
| CN110989699A (en) * | 2019-12-25 | 2020-04-10 | 东莞市启晨自动化设备有限公司 | Low-shearing force precise flow control system |
| CN113486609A (en) * | 2021-07-05 | 2021-10-08 | 河南城建学院 | Fluid material conveying device and method based on hydrodynamics Bernoulli principle |
| CN113486609B (en) * | 2021-07-05 | 2022-04-19 | 河南城建学院 | Fluid material conveying device and method based on hydrodynamics Bernoulli principle |
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Application publication date: 20151223 |