CN108817153A - A kind of efficient steel pipe bending equipment - Google Patents
A kind of efficient steel pipe bending equipment Download PDFInfo
- Publication number
- CN108817153A CN108817153A CN201810538760.6A CN201810538760A CN108817153A CN 108817153 A CN108817153 A CN 108817153A CN 201810538760 A CN201810538760 A CN 201810538760A CN 108817153 A CN108817153 A CN 108817153A
- Authority
- CN
- China
- Prior art keywords
- fast pulley
- contact roller
- steel pipe
- turntable
- group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/02—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment
- B21D7/024—Bending rods, profiles, or tubes over a stationary forming member; by use of a swinging forming member or abutment by a swinging forming member
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/14—Bending rods, profiles, or tubes combined with measuring of bends or lengths
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention discloses a kind of efficient steel pipe bending equipments, including pedestal, turntable, fast pulley group, contact roller group, pointer, scale plate, support rod and fixing piece；Turntable is arranged on the rack, and rack is set on the base；Rack is equipped with motor；Fast pulley group, contact roller group are arranged on turntable；Fast pulley group includes the first coaxially connected fast pulley, the second fast pulley and third fast pulley, and fast pulley group and turntable are coaxially disposed；Contact roller group includes the first coaxially connected contact roller, the second contact roller and third contact roller；Contact roller group and turntable are rotatablely connected；Fast pulley and contact roller, which cooperate, to be arranged；Support rod is set on the base, and fixing piece is arranged on support rod；Fixing piece is provided with through-hole；Scale plate is set on the base, and is located at the front of fast pulley group；Pointer is provided on first fast pulley.This hair can control the angle of steel pipe bending, and the radius of steel pipe bending part can be controlled according to the radius of fast pulley.
Description
Technical field
The present invention relates to steel pipe processing equipment field more particularly to a kind of efficient steel pipe bending equipments.
Background technique
In machine-building, the manufacture, processing of especially steel pipe are very universal, need to roll over steel pipe in many cases
It is curved.
Work in-process is needed steel pipe bending according to service condition in different radians；For example, when steel pipe is mutual along two sides
When vertical metope carries out bending, the radius bend very little after needing to guarantee steel pipe bending can be such that steel pipe is close to metope；
When steel pipe carries out bending around cylindrical construction, this radius bend of steel pipe is preferably identical as the radius of cylinder, can make steel
Pipe is preferably bonded with cylinder.
Existing bending mechanism needs the experience by operator to carry out the bending process of steel pipe, it is difficult to guarantee steel pipe
This bending radius of the radian, it is more difficult to the bending angle of accurate control steel pipe.
Therefore, steel pipe how to be made to guarantee the accurate of bending angle, and the radian that control bending is formed in bending process
Radius, be to need a problem solving.
Summary of the invention
To solve technical problem present in background technique, the present invention proposes a kind of efficient steel pipe bending equipment, can control
The angle of steel pipe bending processed can control the radius of steel pipe bending part according to the radius of fast pulley.
A kind of efficient steel pipe bending equipment proposed by the present invention, including pedestal, turntable, fast pulley group, contact roller group, refer to
Needle, scale plate, support rod and fixing piece；
Turntable is arranged on the rack, and rack is set on the base；Rack is equipped with the motor of driving turntable rotation；Fast pulley
Group, contact roller group are arranged on turntable；
Fast pulley group includes the first coaxially connected fast pulley, the second fast pulley and third fast pulley；First fast pulley,
The diameter of two fast pulleys and third fast pulley is sequentially increased；Fast pulley group and turntable are coaxially disposed, fast pulley group not rotation, so that
Fast pulley group is driven to rotate synchronously in turntable rotation process；
Contact roller group includes the first coaxially connected contact roller, the second contact roller and third contact roller；First contact roller,
The diameter of two contact rollers and third contact roller is sequentially reduced；Contact roller group and turntable are rotatablely connected, and are driven in turntable rotation process
Contact roller group is moved in a circle using the shaft of turntable as the center of circle；
First fast pulley, the second fast pulley and third fast pulley respectively with the first contact roller, the second contact roller and third pressure
Bearing up pulley cooperates setting, so as to bending steel tube clamping between the first fast pulley, the first contact roller or the second fast pulley, the
Between two contact rollers or between third fast pulley, third contact roller；
Support rod is set on the base, and fixing piece is arranged on support rod；There are three ribbon supply bending steel pipes for fixing piece setting
The through-hole passed through；The through-hole of fixing piece is respectively facing the space between fast pulley, contact roller, so that put with bending steel pipe level
It sets；
Scale plate is set on the base, and is located at the front of fast pulley group；Scale plate is transparent panel, annular on scale plate
Scale value is set, and the center of circle where scale value is overlapped with the center of circle of the first fast pulley；The surface of scale plate is zero graduation value；
Pointer is provided on first fast pulley, pointer is overlapped with the diameter of the first fast pulley.
Preferably, fast pulley, contact roller periphery are equipped with the arc groove being recessed inwardly.
Preferably, fast pulley, the arc groove on contact roller are semicircle, and the radius of arc groove with to the outer of bending steel pipe
All radiuses are equal.
Preferably, fast pulley, the thickness of contact roller are identical, and its thickness is greater than the diameter to bending steel pipe；Arc slot position
In fast pulley, the center position of contact roller circumferential surface.
Preferably, the through-hole length of fixing piece is not less than 10 centimetres.
Preferably, multiple groups are arranged in support rod, are both provided with fixing piece on each support rod.
Preferably, pedestal is equipped with the sliding rail slided for support rod, and sliding rail is parallel with the vertical plane where turntable.
In the present invention, it is fixed in the through-hole to one end insertion fixing piece of bending steel pipe, the steel pipe other end passes through solid
Space between fixed wheel, contact roller is in horizontality to bending steel pipe；Contact roller group is treated bending steel pipe and is slowly squeezed
Pressure, so that bending occurs along the periphery of fast pulley group to bending steel pipe, to achieve the purpose that steel pipe bending；Wherein, by pointer,
Scale plate can observe the angle of indicators turn in time, so as to accurately control the angle of steel pipe bending.
In the present invention, fast pulley and contact roller cooperate setting, so as to bending steel tube clamping in the first fast pulley, the
Between one contact roller or between the second fast pulley, the second contact roller or between third fast pulley, third contact roller；Fast pulley, pressure
Bearing up pulley clamps steel pipe and will not shake because of stress deformation so that steel pipe keeps stability in bending process, avoids influencing
Bending effect；
Wherein, steel pipe because the first fast pulley, the second fast pulley and third fast pulley radius difference so that steel pipe bending
Radius it is identical as the radius of the first fast pulley, the second fast pulley and third fast pulley respectively；Selection is different in process
The fast pulley of diameter just can achieve the purpose that the radius for processing different steel pipe bendings, improve work efficiency；Meanwhile it originally setting
It is standby to carry out Bending Processing simultaneously to multiple steel pipes, will disposably meet the needs of different, largely saves the production time.
In the present invention, contact roller group rotation, so that sliding friction is formed between contact roller group and steel pipe, to reduce contact roller
Frictional force between steel pipe guarantees steel pipe folding so that the deformation on other directions will not occur because of friction effects for steel pipe
The round and smooth degree of steel pipe periphery when curved improves the quality of steel pipe bending.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of efficient steel pipe bending equipment proposed by the present invention.
Fig. 2 is partial structure diagram in efficient steel pipe bending equipment proposed by the present invention.
Fig. 3 is the structural schematic diagram of scale plate in efficient steel pipe bending equipment proposed by the present invention.
Specific embodiment
As shown in Figure 1-3, Fig. 1 is the structural schematic diagram of efficient steel pipe bending equipment proposed by the present invention；Fig. 2 is the present invention
Partial structure diagram in the efficient steel pipe bending equipment proposed；Fig. 3 is to carve in efficient steel pipe bending equipment proposed by the present invention
Spend the structural schematic diagram of plate.
Referring to Fig.1-3, a kind of efficient steel pipe bending equipment proposed by the present invention, including pedestal 9, turntable 1, fast pulley group 4,
Contact roller group 2, pointer 3, scale plate 5, support rod 6 and fixing piece 7；
Turntable 1 is arranged on the rack, and rack is arranged on pedestal 9；Rack is equipped with the motor that driving turntable 1 rotates；Gu
Fixed wheel group 4, contact roller group 2 are respectively provided on the turntable 1；
Fast pulley group 4 includes the first coaxially connected fast pulley 41, the second fast pulley 42 and third fast pulley 43；First is solid
The diameter of fixed wheel 41, the second fast pulley 42 and third fast pulley 43 is sequentially increased；Fast pulley group 4 and turntable 1 are coaxially disposed, fixed
The 4 not rotation of wheel group, so that drive fast pulley group 4 to rotate synchronously in 1 rotation process of turntable；
Contact roller group 2 includes the first coaxially connected contact roller 21, the second contact roller 22 and third contact roller 23；First pressure
The diameter of bearing up pulley 21, the second contact roller 22 and third contact roller 23 is sequentially reduced；Contact roller group 2 and turntable 1 are rotatablely connected, turntable
Contact roller group 2 is driven to move in a circle using the shaft of turntable 1 as the center of circle in 1 rotation process；
First fast pulley 41, the second fast pulley 42 and third fast pulley 43 respectively with the first contact roller 21, the second contact roller
22 and third contact roller 23 cooperate setting so as to bending steel tube clamping in the first fast pulley 41, the first contact roller 21 it
Between or the second fast pulley 42, the second contact roller 22 between or third fast pulley 43, third contact roller 23 between；
Support rod 6 is arranged on pedestal 9, and fixing piece 7 is arranged on support rod 6；There are three ribbon supply bendings for the setting of fixing piece 7
The through-hole 8 that steel pipe passes through；The through-hole 8 of fixing piece 7 is respectively facing the space between fast pulley, contact roller, so that with bending steel pipe
It is horizontal positioned；
Scale plate 5 is arranged on pedestal 9, and is located at the front of fast pulley group 4；Scale plate 5 is transparent panel, scale plate 5
Upper annular setting scale value 51, and the center of circle where scale value 51 is overlapped with the center of circle of the first fast pulley 41；Scale plate 5 just on
Side is zero graduation value；
Pointer 3 is provided on first fast pulley 41, pointer 3 is overlapped with the diameter of the first fast pulley 41.
In the present embodiment course of work, it will be fixed in the through-hole 8 of the insertion of one end to bending steel pipe fixing piece 7, steel
Space of the pipe other end across fast pulley, contact roller is in horizontality to bending steel pipe；Start motor driven turntable 1
Rotation, contact roller group 2 is treated bending steel pipe and is slowly squeezed, so that rolling over to bending steel pipe along the periphery of fast pulley group 4
It is curved, to achieve the purpose that steel pipe bending；Wherein, the angle that the rotation of pointer 3 can be observed in time by pointer 3, scale plate 5, from
And it can accurately control the angle of steel pipe bending.
In the present embodiment, the first fast pulley 41, the second fast pulley 42 and third fast pulley 43 respectively with the first contact roller 21,
Second contact roller 22 and third contact roller 23, which cooperate, to be arranged, so as to bending steel tube clamping in the first fast pulley 41, first
Between contact roller 21 or between the second fast pulley 42, the second contact roller 22 or between third fast pulley 43, third contact roller 23；Gu
Fixed wheel, contact roller clamp steel pipe and will not shake because of stress deformation so that steel pipe keeps stability in bending process,
It avoids influencing bending effect；
Wherein, steel pipe because 43 radius of the first fast pulley 41, the second fast pulley 42 and third fast pulley difference so that steel
The radius of pipe bending is identical as the radius of the first fast pulley 41, the second fast pulley 42 and third fast pulley 43 respectively；Processed
The fast pulley that different-diameter is selected in journey, just can achieve the purpose that the radius for processing different steel pipe bendings, improve work effect
Rate；Meanwhile this equipment can carry out Bending Processing simultaneously to multiple steel pipes, will disposably meet the needs of different, it is a large amount of to save
Production time.
In the present embodiment, in 1 rotation process of turntable, rotation can occur for contact roller group 2, so that contact roller group 2 and steel pipe
Between form sliding friction, to reduce the frictional force between contact roller and steel pipe, so that steel pipe will not be sent out because of friction effects
Deformation on other raw directions, guarantees the round and smooth degree of steel pipe periphery when steel pipe bending, improves the quality of steel pipe bending.
In a specific embodiment, fast pulley, contact roller periphery are equipped with the arc groove being recessed inwardly, so as to bending steel pipe
More stable is clamped between fast pulley, contact roller, reduces the shaking to bending steel pipe, improves steel pipe bending quality.
Further, fast pulley, the arc groove on contact roller are semicircle, and the radius of arc groove with to bending steel pipe
Peripheral radius is equal, so that the periphery of steel pipe is pressed in arc groove completely, further guarantees the clamping for treating bending steel pipe
Effect, and comprehensive extruding is carried out to the steel pipe position that deformation occurs, guarantee that the cross section of the steel pipe in bending process will not
Deformation occurs, the situation for avoiding steel pipe from being crushed, to improve the quality of steel pipe bending.
Further, fast pulley, the thickness of contact roller are identical, and its thickness is greater than the diameter to bending steel pipe；Arc groove
Positioned at fast pulley, the center position of contact roller circumferential surface, during steel pipe bending, fast pulley, contact roller are similarly subjected to very
Big extruding force in order to guarantee the service life of fast pulley, contact roller and prevent fast pulley, contact roller deformation occurs, therefore mentions
High fast pulley, contact roller thickness to increasing its intensity, to guarantee processing quality；Arc groove is located at fast pulley, contact roller week
The center position in face is more conducive to fast pulley, contact roller uniform force, avoids fast pulley, contact roller due to unbalance stress
Caused deformation, to guarantee processing quality.
When fixing piece 7 through-hole 8 too in short-term, steel pipe can generate very big pressure to the active force of fixing piece 7, meeting when serious
Leading to fixing piece 7, deformation occurs, and then influences the bending quality of steel pipe；In a specific embodiment, the through-hole 8 of fixing piece 7 is long
Degree is not less than 10 centimetres, and fixing piece 7 has direct firm effect, the longer firm effect to steel pipe of fixing piece 7 to steel pipe
It is good, thus to improve the bending quality of steel pipe.
Further, multiple groups are arranged in support rod 6, are both provided with fixing piece 7 on each support rod 6, multiple fixing pieces are common
Steel pipe is supported, so that steel pipe uniform force, it is good that steel pipe consolidates effect.
Further, pedestal 9 is equipped with the sliding rail slided for support rod 6, and sliding rail is parallel with the vertical plane where turntable 1；
User, so that steel pipe reaches best bending effect, can be improved by adjusting the distance between support rod 6, fast pulley group 4
Steel pipe bending quality.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (7)
1. a kind of efficient steel pipe bending equipment, which is characterized in that including pedestal (9), turntable (1), fast pulley group (4), contact roller
Group (2), pointer (3), scale plate (5), support rod (6) and fixing piece (7)；
Turntable (1) is arranged on the rack, and rack is arranged on pedestal (9)；Rack is equipped with the motor of driving turntable (1) rotation；
Fast pulley group (4), contact roller group (2) are arranged on turntable (1)；
Fast pulley group (4) includes coaxially connected the first fast pulley (41), the second fast pulley (42) and third fast pulley (43)；The
The diameter of one fast pulley (41), the second fast pulley (42) and third fast pulley (43) is sequentially increased；Fast pulley group (4) and turntable
(1) it is coaxially disposed, fast pulley group (4) not rotation, so that drive fast pulley group (4) to rotate synchronously in turntable (1) rotation process；
Contact roller group (2) includes coaxially connected the first contact roller (21), the second contact roller (22) and third contact roller (23)；The
The diameter of one contact roller (21), the second contact roller (22) and third contact roller (23) is sequentially reduced；Contact roller group (2) and turntable
(1) it is rotatablely connected, drives contact roller group (2) to move in a circle using the shaft of turntable (1) as the center of circle in turntable (1) rotation process；
First fast pulley (41), the second fast pulley (42) and third fast pulley (43) are pressed with the first contact roller (21), second respectively
Bearing up pulley (22) and third contact roller (23), which cooperate, to be arranged, so as to bending steel tube clamping in the first fast pulley (41), first
Between contact roller (21) or between the second fast pulley (42), the second contact roller (22) or third fast pulley (43), third contact roller
(23) between；
Support rod (6) is arranged on pedestal (9), and fixing piece (7) is arranged on support rod (6)；There are three supply for fixing piece (7) setting
The through-hole (8) passed through with bending steel pipe；The through-hole (8) of fixing piece (7) is respectively facing the space between fast pulley, contact roller, with
It is horizontal positioned to band bending steel pipe；
Scale plate (5) is arranged on pedestal (9), and is located at the front of fast pulley group (4)；Scale plate (5) is transparent panel, scale
Annular setting scale value (51) on plate (5), and the center of circle where scale value (51) is overlapped with the center of circle of the first fast pulley (41)；It carves
The surface for spending plate (5) is zero graduation value；
It is provided on first fast pulley (41) pointer (3), pointer (3) is overlapped with the diameter of the first fast pulley (41).
2. efficient steel pipe bending equipment according to claim 1, which is characterized in that fast pulley, contact roller periphery be equipped with to
The arc groove of sunken inside.
3. efficient steel pipe bending equipment according to claim 1, which is characterized in that the arc groove on fast pulley, contact roller
For semicircle, and the radius of arc groove is equal with the peripheral radius to bending steel pipe.
4. efficient steel pipe bending equipment according to claim 1, which is characterized in that fast pulley, the thickness of contact roller are identical,
And its thickness is greater than the diameter to bending steel pipe；Arc groove is located at the center position of fast pulley, contact roller circumferential surface.
5. efficient steel pipe bending equipment according to claim 1, which is characterized in that through-hole (8) length of fixing piece (7) is not
Less than 10 centimetres.
6. efficient steel pipe bending equipment according to claim 1, which is characterized in that multiple groups, Mei Gezhi is arranged in support rod (6)
Fixing piece (7) are both provided on strut (6).
7. efficient steel pipe bending equipment according to claim 1, which is characterized in that pedestal (9) is equipped with for support rod (6)
The sliding rail of sliding, sliding rail are parallel with the vertical plane where turntable (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810538760.6A CN108817153A (en) | 2018-05-30 | 2018-05-30 | A kind of efficient steel pipe bending equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810538760.6A CN108817153A (en) | 2018-05-30 | 2018-05-30 | A kind of efficient steel pipe bending equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108817153A true CN108817153A (en) | 2018-11-16 |
Family
ID=64146390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810538760.6A Pending CN108817153A (en) | 2018-05-30 | 2018-05-30 | A kind of efficient steel pipe bending equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108817153A (en) |
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|---|---|---|---|---|
| JPS5321069A (en) * | 1976-08-11 | 1978-02-27 | Masamitsu Takao | Machine for bending pipes used in piping works |
| DE2711340A1 (en) * | 1977-03-16 | 1978-09-21 | Ludwig Lang | Bending tool for tubes or bars - has block movable around stack of different dia. forming grooves to obtain various bend radii |
| US4249407A (en) * | 1979-04-02 | 1981-02-10 | Fogleman Boyd C | Apparatus for bending steel tubes |
| JPS5731414A (en) * | 1980-07-31 | 1982-02-19 | Hitachi Ltd | Method and apparatus for bending pipe |
| GB2275219A (en) * | 1993-02-20 | 1994-08-24 | Btr Plc | Bending apparatus |
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| DE102009024406A1 (en) * | 2009-06-09 | 2010-12-16 | Wafios Ag | Rotary bending tool has eccentric clamp for bending elongate workpieces, such as pipes, wires, or profile strands, where bending head comprises mandrel rotatable about rotation axis and assigned clamping jaw movable relative to it |
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| CN203076386U (en) * | 2013-01-22 | 2013-07-24 | 圣佑精密钢管（天津）有限公司 | Automatic steel tube bending machine |
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| CN203842974U (en) * | 2014-05-09 | 2014-09-24 | 苏州富士特金属薄板制品有限公司 | Pipe bending machine |
| CN203991825U (en) * | 2014-07-07 | 2014-12-10 | 李晓泉 | The curved high accuracy bending apparatus of steel pipe |
| CN204108049U (en) * | 2014-08-07 | 2015-01-21 | 郑州万达管件制造有限公司 | Fluid pressure type cold bend pipe device |
| CN205270472U (en) * | 2015-12-31 | 2016-06-01 | 天津市深呼吸自行车业有限公司 | Automatic bicycle multistation bending machine of material loading |
| CN206966380U (en) * | 2017-05-22 | 2018-02-06 | 东莞市唯美陶瓷工业园有限公司 | A kind of automatic pipebender |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5321069A (en) * | 1976-08-11 | 1978-02-27 | Masamitsu Takao | Machine for bending pipes used in piping works |
| DE2711340A1 (en) * | 1977-03-16 | 1978-09-21 | Ludwig Lang | Bending tool for tubes or bars - has block movable around stack of different dia. forming grooves to obtain various bend radii |
| US4249407A (en) * | 1979-04-02 | 1981-02-10 | Fogleman Boyd C | Apparatus for bending steel tubes |
| JPS5731414A (en) * | 1980-07-31 | 1982-02-19 | Hitachi Ltd | Method and apparatus for bending pipe |
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| JPH11226654A (en) * | 1998-02-19 | 1999-08-24 | Rex Ind Co Ltd | Pipe bender |
| EP1543891A1 (en) * | 2003-12-18 | 2005-06-22 | Herber Industri AB | Locking device |
| DE102009024406A1 (en) * | 2009-06-09 | 2010-12-16 | Wafios Ag | Rotary bending tool has eccentric clamp for bending elongate workpieces, such as pipes, wires, or profile strands, where bending head comprises mandrel rotatable about rotation axis and assigned clamping jaw movable relative to it |
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| EP2756892A1 (en) * | 2013-01-21 | 2014-07-23 | WAFIOS Aktiengesellschaft | Bending device for bar-shaped workpieces |
| CN203076386U (en) * | 2013-01-22 | 2013-07-24 | 圣佑精密钢管（天津）有限公司 | Automatic steel tube bending machine |
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| CN204108049U (en) * | 2014-08-07 | 2015-01-21 | 郑州万达管件制造有限公司 | Fluid pressure type cold bend pipe device |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181116 |