CN109968029A - A kind of assembly bench - Google Patents
A kind of assembly bench Download PDFInfo
- Publication number
- CN109968029A CN109968029A CN201910419797.1A CN201910419797A CN109968029A CN 109968029 A CN109968029 A CN 109968029A CN 201910419797 A CN201910419797 A CN 201910419797A CN 109968029 A CN109968029 A CN 109968029A
- Authority
- CN
- China
- Prior art keywords
- supporting plate
- lifting platform
- assembly bench
- workpiece
- driving shaft
- 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.)
- Withdrawn
Links
- 230000005540 biological transmission Effects 0.000 claims description 12
- 230000007423 decrease Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 230000002459 sustained effect Effects 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 230000032258 transport Effects 0.000 description 5
- 230000005611 electricity Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/001—Article feeders for assembling machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P21/00—Machines for assembling a multiplicity of different parts to compose units, with or without preceding or subsequent working of such parts, e.g. with programme control
- B23P21/002—Machines for assembling a multiplicity of different parts to compose units, with or without preceding or subsequent working of such parts, e.g. with programme control the units stationary whilst being composed
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automatic Assembly (AREA)
Abstract
A kind of assembly bench, including bottom plate, supporting plate, several skeletons and lifting platform;The lifting platform and several skeletons are fixed on the bottom plate;The supporting plate is connect with the lifting platform, and the lifting platform controls the supporting plate and rises or falls to adjust height where the supporting plate, and the supporting plate is used for support workpiece;The skeleton passes vertically through the supporting plate, and the skeleton is for fixing workpiece.With lifting, fixation and discharging functions, assembly height when each workpiece assembly of superposition can be made to be maintained on sustained height, it is convenient and quick to assemble.
Description
Technical field
The present invention relates to assembly equipment field, in particular to a kind of assembly bench.
Background technique
Currently, traditional assembly equipment structure is simple, it is chiefly used in single-piece workpiece being assembled and formed the assembly of product
Mode, function are less.Single workpiece is assembled, multiple workpiece are superimposed the assembly method of composition product, Duo Shuochuan again
The assembly equipment of system only has the function of clamping workpiece, is not able to satisfy assembly.
Summary of the invention
In view of this, it is necessary to provide a kind of a kind of assembly bench for being able to solve the above problem.
A kind of assembly bench, including bottom plate, supporting plate, several skeletons and lifting platform;The lifting platform and several skeletons are solid
It is scheduled on the bottom plate;The supporting plate is connect with the lifting platform, and the lifting platform controls the supporting plate and rises or falls to adjust
Height where saving the supporting plate, the supporting plate are used for support workpiece;The skeleton passes vertically through the supporting plate, and the skeleton is used for
Fixed workpiece.
Preferably, the lifting platform is fixed in fixing seat, and the fixing seat is fixed on the lifting platform.
Preferably, the bottom plate is equipped with through-hole, and the lifting platform passes through the through-hole.
Preferably, track base is fixedly installed on the bottom plate, the track base is connect with the supporting plate;The track base
Play the role of supporting plate described in support with the lifting platform and is oriented to for the supporting plate.
Preferably, ribbon feeding device is installed on the supporting plate, is used for transmitting workpiece.
Preferably, the ribbon feeding device includes feeding belt, driven shaft, driving shaft, connecting plate, motor and transmission
Band, the motor are fixed on connecting plate 8, and the connecting plate is fixed on the supporting plate.
Preferably, the driven shaft and the driving shaft are separately mounted to the both ends of the supporting plate, the feeding belt peace
On the supporting plate, the driven shaft and the driving shaft.
Preferably, fast pulley is fixedly installed on the driving shaft and the driven shaft;The fast pulley is hollow cylinder
Body, internal diameter are fitted closely with the driving shaft and the driven shaft, and outer diameter is bonded with the feeding belt;The feeding skin
Band is installed on the fast pulley.
Preferably, for the transmission belt respectively with the shaft of the motor and the active axis connection, the motor passes through institute
It states transmission belt and drives the driving shaft rotation.
The present invention is applied to after completing assembly to single workpiece, then is superimposed the assembly that new workpiece is assembled on the workpiece
Mode.With lifting, fixation and discharging functions, assembly height when each workpiece assembly of superposition can be made to be maintained at same height
On degree, it is convenient and quick to assemble.
Detailed description of the invention
Fig. 1 and Fig. 2 is the overall structure diagram of assembly bench;
Wherein, description of symbols:
Label | Title | Label | Title |
1 | Bottom plate | 71 | Feeding belt |
11 | Through-hole | 72 | Driving shaft |
2 | Supporting plate | 73 | Driven shaft |
3 | Skeleton | 74 | Motor |
4 | Lifting platform | 75 | Transmission belt |
5 | Fixing seat | 8 | Connecting plate |
6 | Track base | 9 | Fast pulley |
7 | Ribbon feeding device |
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It should be noted that be referred to as " being fixed on " another component when component, it can directly on another component or
There may also be components placed in the middle.When a component is considered as " connection " another component, it can be directly to separately
One component may be simultaneously present component placed in the middle.When a component is considered as " being set to " another component, it be can be
It is set up directly on another component or may be simultaneously present component placed in the middle.Term as used herein " vertically ", " level
", "left", "right" and similar statement for illustrative purposes only.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more phases
Any and all combinations of the listed item of pass.
As shown in Figures 1 and 2, a kind of assembly bench, including bottom plate 1, supporting plate 2, several skeletons 3 and lifting platform 4;The lifting
Platform 4 and several skeletons 3 are fixed on the bottom plate 1;The supporting plate 2 is connect with the lifting platform 4, and the lifting platform 4 is controlled
It makes the supporting plate 2 to rise or fall to adjust height where the supporting plate 2, the supporting plate 2 is used for support workpiece;The skeleton 3
The supporting plate 2 is passed vertically through, the skeleton 3 is for fixing workpiece.
In the present embodiment, workpiece assembling process carries out on the supporting plate 2, and the supporting plate 2 is used for support workpiece.It is described
Skeleton 3, which is fixed on the bottom plate 1, is then passed through the supporting plate 2, and it is in order not to allow that the skeleton 3 and the supporting plate 2, which are simultaneously not connected to,
The skeleton 3 follows the supporting plate 2 mobile.The skeleton 3 is used to fix workpiece on the supporting plate 2, and there are hole quilts in workpiece
The skeleton 3 passes through.In assembling process, constantly there is workpiece to be added on the supporting plate 2, assembling process is on the supporting plate 2
The workpiece of top layer assembled.Top layer's workpiece when to guarantee that machinery assembles workpiece, in the workpiece body of superposition
It is always held at sustained height, is convenient for Automatic manual transmission, when being superimposed workpiece, the lifting platform 4 drives the supporting plate 2 correspondingly to decline
One Duan Gaodu, so that workpiece body entire lowering, the workpiece of top layer remains at sustained height.During workpiece body decline,
Skeleton 3 can make guiding role for it, and limit its down position, prevent from deviating.When being assembled with a certain number of workpiece on supporting plate 2
Later, the lifting platform 4 drives the supporting plate 2 to rise, and rises to certain altitude and workpiece is made to be detached from skeleton 3, later can be dress
Workpiece body with completion transports.
Further, the lifting platform 4 is fixed in fixing seat 5, and the fixing seat 5 is fixed on the lifting platform 4.
The lifting platform 4 is that the supporting plate 2 provides fluctuating orbit, thus the lifting platform 4 need to have comparable length with
Guarantee that the supporting plate 2 has sufficient fitting limit.While 4 height of the lifting platform is higher, the stability of position is poorer,
Itself it is fixed on the bottom plate 1 that there are tipping risks by the lifting platform 4.The fixing seat 5 need to be added and connect the liter
Platform 4 is dropped, increases the contact area of the lifting platform 4 and the bottom plate 1, stability is provided.It should be noted that increasing described solid
While 5 width of reservation, increase its height, the center of gravity of the lifting platform 4 can be reduced.
Further, the bottom plate 1 is equipped with through-hole 11, and the lifting platform 4 passes through the through-hole 11.
Under the fixed function of the fixing seat 5, itself can not be contacted the lifting platform 4 with the bottom plate 1.The liter
It drops platform 4 and is equipped with motor 74 as the movement of supporting plate 2 described in power source drive, it should be noted that the motor 74 is mounted on the liter
The bottom of platform 4 drops, convenient for driving the guide rail of the lifting platform 4;Since 74 equipment of motor occupies biggish space, if making motor
74 are mounted on the bottom plate 1, then occupy a part of space on the bottom plate 1 so that the supporting plate 2 need hoisting depth with
74 equipment of motor is avoided, the stroke height that this measure will lead to the supporting plate 2 improves, and causes device height to increase overally, assembly is difficult
Degree is got higher.Correspondingly, only through-hole 11 need to be opened up in the position of the corresponding lifting platform 4 of bottom plate 1, makes the 4 part area of lifting platform
Domain drops to 1 lower section of bottom plate, with regard to can solve assembly excessive height problem.
Further, track base 6 is fixedly installed on the bottom plate 1, the track base 6 is connect with the supporting plate 2;It is described
Track base 6 and the lifting platform 4 play the role of supporting plate 2 described in support and are oriented to for the supporting plate 2.
In order to balance the assembly bench two sides in lifting process, 2 side of supporting plate is connected with the lifting platform 4, separately
Side is connected with the track base 6;It should be noted that the lifting platform 4 plays the mobile work of track base 6 described in active drive
With the track base 6 plays slaved operation, is driven by the supporting plate 2.The setting of the track base 6 is also the mitigation lifting platform
The burden of supporting plate 2 described in 4 supports.
Further, ribbon feeding device 7 is installed on the supporting plate 2, is used for transmitting workpiece.
The assembly bench also undertakes the effect of transmitting workpiece, when multiple workpiece are superimposed upon on the supporting plate 2 and complete to assemble
When, it is not required to that additional transporting equipment is arranged, the ribbon feeding device 7 being equipped with by the supporting plate 2 opens workpiece body transport, under waiting
Once ressemble.The transport step promotes the supporting plate 2 in the lifting platform 4, and the supporting plate 2 is detached from after the skeleton 3.
Further, the ribbon feeding device 7 includes feeding belt 71, driven shaft 73, driving shaft 72, connecting plate 8, electricity
Machine 74 and transmission belt 75, the motor 74 are fixed on connecting plate 8, and the connecting plate 8 is fixed on the supporting plate 2.
The ribbon feeding device 7 selects the motor 74 as power source, makes by way of the connecting plate 8 described in the adjunction
The motor 74 is set to the outside of the supporting plate 2, and is lower than the supporting plate 2, avoids hindering assembling process.The ribbon feeding dress
It sets 7 and transports workpiece in a manner of belt-conveying, workpiece is placed on the feeding belt 71, when the supporting plate 2 is detached from the bone
After frame 3, the motor 74 drives the driving shaft 72 to rotate, and the feeding belt 71 follows rotation, and workpiece thereon starts
Transport.
Further, the driven shaft 73 and the driving shaft 72 are separately mounted to the both ends of the supporting plate 2, the feeding
Belt 71 is mounted on the supporting plate 2, the driven shaft 73 and the driving shaft 72.
The feeding belt 71 need to cover the supporting plate 2 one weeks, to avoid the feeding belt 71 the two of the supporting plate 2
The part poor contact at end and interfere to rotate, specially in two sections of setting shafts of the supporting plate 2, the driving shaft 72 is actively driven
The feeding belt 71 rotates.
Further, fast pulley 9 is fixedly installed on the driving shaft 72 and the driven shaft 73;The fast pulley 9 is
Hollow cylinder, internal diameter are fitted closely with the driving shaft 72 and the driven shaft 73, outer diameter and the feeding belt 71
Fitting;The feeding belt 71 is installed on the fast pulley 9.
The feeding belt 71 does not contact directly with the driving shaft 72 and the driven shaft 73, and is mounted on the fixation
On wheel 9.If the feeding belt 71 is mounted in shaft, there can be the volume hidden danger of 71 positional shift of feeding belt.It is described
The width of feeding belt 71 described in two lateral adaptation of fast pulley 9 is equipped with retaining wall, and the feeding belt 71 is hindered to deviate.And it can basis
The thickness of the supporting plate 2 selects the fast pulley 9 of corresponding diameter to be installed, and this measure is to keep the feeding belt 71
Upper and lower surfaces do not locate region all in the same horizontal line, are just able to rotate more smooth.
Further, the transmission belt 75 is connect with the shaft of the motor 74 and the driving shaft 72 respectively, the electricity
Machine 74 drives the driving shaft 72 to rotate by the transmission belt 75.
Power source of the motor 74 as the ribbon feeding device 7 drives the active in a manner of belt transmission
Axis 72 rotates.The frame mode is simple, easy to assembly.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in scope of patent protection of the invention.
Claims (9)
1. a kind of assembly bench, which is characterized in that including bottom plate, supporting plate, several skeletons and lifting platform;The lifting platform and several institutes
Skeleton is stated to be fixed on the bottom plate;The supporting plate is connect with the lifting platform, the lifting platform control the supporting plate rise or
To adjust height where the supporting plate, the supporting plate is used for support workpiece for decline;The skeleton passes vertically through the supporting plate, described
Skeleton is for fixing workpiece.
2. a kind of assembly bench according to claim 1, which is characterized in that the lifting platform is fixed in fixing seat, described
Fixing seat is fixed on the lifting platform.
3. a kind of assembly bench according to claim 2, which is characterized in that the bottom plate is equipped with through-hole, the lifting platform
Pass through the through-hole.
4. a kind of assembly bench according to claim 1, which is characterized in that be fixedly installed with track base, institute on the bottom plate
Track base is stated to connect with the supporting plate;The track base plays supporting plate described in support with the lifting platform and leads for the supporting plate
To effect.
5. a kind of assembly bench according to claim 1, which is characterized in that ribbon feeding device is installed on the supporting plate,
For transmitting workpiece.
6. a kind of assembly bench according to claim 5, which is characterized in that the ribbon feeding device include feeding belt,
Driven shaft, driving shaft, connecting plate, motor and transmission belt, the motor are fixed on connecting plate 8, and the connecting plate is fixed on institute
It states on supporting plate.
7. a kind of assembly bench according to claim 6, which is characterized in that the driven shaft and the driving shaft are installed respectively
At the both ends of the supporting plate, the feeding belt is mounted on the supporting plate, the driven shaft and the driving shaft.
8. a kind of assembly bench according to claim 7, which is characterized in that fixed peace on the driving shaft and the driven shaft
Equipped with fast pulley;The fast pulley is hollow cylinder, and internal diameter is fitted closely with the driving shaft and the driven shaft, outside
Diameter is bonded with the feeding belt;The feeding belt is installed on the fast pulley.
9. a kind of assembly bench according to claim 8, which is characterized in that the transmission belt shaft with the motor respectively
With the active axis connection, the motor drives the driving shaft rotation by the transmission belt.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201910419797.1A CN109968029A (en) | 2019-05-20 | 2019-05-20 | A kind of assembly bench |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201910419797.1A CN109968029A (en) | 2019-05-20 | 2019-05-20 | A kind of assembly bench |
Publications (1)
Publication Number | Publication Date |
---|---|
CN109968029A true CN109968029A (en) | 2019-07-05 |
Family
ID=67073855
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201910419797.1A Withdrawn CN109968029A (en) | 2019-05-20 | 2019-05-20 | A kind of assembly bench |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN109968029A (en) |
Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05337767A (en) * | 1992-05-29 | 1993-12-21 | Howa Mach Ltd | Work fixing device of machine tool |
JP2003251544A (en) * | 2002-02-28 | 2003-09-09 | Daihatsu Motor Co Ltd | Workpiece positioning device |
CN102528533A (en) * | 2012-01-17 | 2012-07-04 | 柳州高华机械有限公司 | Electromagnetic feeding device |
CN104003099A (en) * | 2014-06-03 | 2014-08-27 | 苏州博众精工科技有限公司 | Assembly line device |
CN104209743A (en) * | 2014-09-24 | 2014-12-17 | 苏州石丸英合精密机械有限公司 | Workpiece feeder of full-automatic screw locking machine |
CN104259842A (en) * | 2014-09-24 | 2015-01-07 | 苏州石丸英合精密机械有限公司 | Full-automatic screw locking machine |
CN205074761U (en) * | 2015-09-11 | 2016-03-09 | 鸿准精密模具(昆山)有限公司 | Automatic assembly machine |
CN105910293A (en) * | 2016-06-21 | 2016-08-31 | 苏州市吴中区木渎华利模具加工店 | Temperature sensor assembling mechanism of water heater water valve part assembling machine |
CN106584064A (en) * | 2016-12-30 | 2017-04-26 | 湖南先步信息股份有限公司 | Tray locating mechanism for intelligent assembly platform |
CN106584103A (en) * | 2016-12-30 | 2017-04-26 | 湖南先步信息股份有限公司 | Cyclic full-automatic assembly line |
CN107617870A (en) * | 2016-07-14 | 2018-01-23 | 富鼎电子科技(嘉善)有限公司 | Automatic assembling device |
CN207205789U (en) * | 2017-08-23 | 2018-04-10 | 安徽鼎封橡胶减震技术有限公司 | A kind of front damper connection component bolt automatic assembly equipment |
CN208438736U (en) * | 2018-06-21 | 2019-01-29 | 湖南上势智能科技有限公司 | Cantilevered 3D printing elevating mechanism |
CN209811696U (en) * | 2019-05-20 | 2019-12-20 | 佛山市智维佳科技有限公司 | Assembly table |
-
2019
- 2019-05-20 CN CN201910419797.1A patent/CN109968029A/en not_active Withdrawn
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05337767A (en) * | 1992-05-29 | 1993-12-21 | Howa Mach Ltd | Work fixing device of machine tool |
JP2003251544A (en) * | 2002-02-28 | 2003-09-09 | Daihatsu Motor Co Ltd | Workpiece positioning device |
CN102528533A (en) * | 2012-01-17 | 2012-07-04 | 柳州高华机械有限公司 | Electromagnetic feeding device |
CN104003099A (en) * | 2014-06-03 | 2014-08-27 | 苏州博众精工科技有限公司 | Assembly line device |
CN104209743A (en) * | 2014-09-24 | 2014-12-17 | 苏州石丸英合精密机械有限公司 | Workpiece feeder of full-automatic screw locking machine |
CN104259842A (en) * | 2014-09-24 | 2015-01-07 | 苏州石丸英合精密机械有限公司 | Full-automatic screw locking machine |
CN205074761U (en) * | 2015-09-11 | 2016-03-09 | 鸿准精密模具(昆山)有限公司 | Automatic assembly machine |
CN105910293A (en) * | 2016-06-21 | 2016-08-31 | 苏州市吴中区木渎华利模具加工店 | Temperature sensor assembling mechanism of water heater water valve part assembling machine |
CN107617870A (en) * | 2016-07-14 | 2018-01-23 | 富鼎电子科技(嘉善)有限公司 | Automatic assembling device |
CN106584064A (en) * | 2016-12-30 | 2017-04-26 | 湖南先步信息股份有限公司 | Tray locating mechanism for intelligent assembly platform |
CN106584103A (en) * | 2016-12-30 | 2017-04-26 | 湖南先步信息股份有限公司 | Cyclic full-automatic assembly line |
CN207205789U (en) * | 2017-08-23 | 2018-04-10 | 安徽鼎封橡胶减震技术有限公司 | A kind of front damper connection component bolt automatic assembly equipment |
CN208438736U (en) * | 2018-06-21 | 2019-01-29 | 湖南上势智能科技有限公司 | Cantilevered 3D printing elevating mechanism |
CN209811696U (en) * | 2019-05-20 | 2019-12-20 | 佛山市智维佳科技有限公司 | Assembly table |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN105750164B (en) | automatic gluing machine | |
CN109775212A (en) | A kind of test production line | |
CN109968029A (en) | A kind of assembly bench | |
CN103991788B (en) | A kind of gantry crane climbing mechanism | |
TW200833593A (en) | Lift system | |
CN206662922U (en) | A kind of metal plate wire drawing machine | |
CN1689951B (en) | Elevator | |
CN100376760C (en) | Circulating automatic up-down scaffold | |
CN210214478U (en) | Lifting machine | |
CN209811696U (en) | Assembly table | |
CN201433030Y (en) | Elevator without machine room | |
CN206142765U (en) | Room interplantation thing is grown and is used hanging flower basket elevating gear | |
CN109091834A (en) | A kind of Middle School Students lift badminton grid frame | |
KR200319005Y1 (en) | hand cart for carrying semiconduct wafer | |
CN208514396U (en) | A kind of truss assembling fixture | |
CN207104631U (en) | Lifting deflecting conveyer for glass grinder | |
CN207726455U (en) | The feeding device of banding machine | |
CN202388442U (en) | Auxiliary frame assembling platform | |
CN205614903U (en) | Unloading mechanism of full -automatic clip machine | |
CN206196587U (en) | Cage lifting device is used in houseplant growth | |
CN213621913U (en) | Transplanter and production line system | |
CN205949232U (en) | Beat and glue conveyer | |
CN214627515U (en) | Upper layer operation and lower layer baking type return line | |
CN210895646U (en) | A silence track for machine is sold to flower | |
CN207973199U (en) | A kind of automatic heap vertebra feed mechanism |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
WW01 | Invention patent application withdrawn after publication | ||
WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190705 |