CN108862087A - A kind of hydraulic elevator - Google Patents
A kind of hydraulic elevator Download PDFInfo
- Publication number
- CN108862087A CN108862087A CN201811104088.6A CN201811104088A CN108862087A CN 108862087 A CN108862087 A CN 108862087A CN 201811104088 A CN201811104088 A CN 201811104088A CN 108862087 A CN108862087 A CN 108862087A
- Authority
- CN
- China
- Prior art keywords
- gear
- connecting rod
- mounting plate
- type
- hydraulic
- 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
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
- B66F3/08—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated
- B66F3/12—Devices, e.g. jacks, adapted for uninterrupted lifting of loads screw operated comprising toggle levers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F2700/00—Lifting apparatus
- B66F2700/03—Lifting jacks with pinion and rack
Abstract
The invention discloses a kind of hydraulic elevators, belong to field of hydraulic equipment, it is therefore intended that solve the problems, such as that existing equipment operation stability is not high.It includes bottom plate, bottom plate one end is equipped with hydraulic motor, the output shaft of hydraulic motor is connected with worm screw, bottom plate side is equipped with mounting plate, mounting plate two sides are hinged with gear, Z-type driver plate is equipped in mounting plate intermediate channel, concave tooth is equipped in the middle part of Z-type driver plate, concave tooth is engaged with worm screw, Z-type transmission board ends are respectively equipped with rack gear, rack and pinion engages respectively, connecting rod is connected separately on gear, the connecting rod other end has also been respectively articulated with a connecting rod, it is additionally provided with T-type mounting plate, T-type installation board ends are hinged with gear, gear is separately connected with connecting rod, Z-type mounting plate is equipped in T-type mounting plate intermediate channel, Z-type installation board ends are respectively equipped with rack gear, rack and pinion engages respectively, T-type mounting plate top is equipped with platform.The present invention is suitable for hydraulic elevator.
Description
Technical field
The invention belongs to field of hydraulic equipment, and in particular to a kind of hydraulic elevator.
Background technique
Hydraulic elevator is mainly to pass through the pressure actuation of hydraulic oil thus the function of realizing lifting, its scissor machinery knot
Structure makes elevator raising have higher stability, roomy job platform and higher bearing capacity, makes high altitude operation range more
Greatly and it is suitble to more people operation simultaneously.It keeps high altitude operation more efficient, and safety more ensures.
A kind of liftable that hydraulic elevator is made of walking mechanism, hydraulic mechanism, electric control mechanism, supporting mechanism
Machinery equipment.Hydraulic oil is formed certain pressure by vane pump, through oil filter, flame-proof type solenoid directional control valve, throttle valve, hydraulic control
Check valve, balanced valve enter fluid cylinder lower end, make the piston upwards of fluid cylinder, lifting heavy, the oil return of fluid cylinder upper end is through flame-proof type
Solenoid directional control valve returns to fuel tank, and rated pressure is adjusted by overflow valve, observes pressure gauge reading value by pressure gauge.
Currently, hydraulic elevator is almost unrestricted with its stroke, load capacity is strong, is answered extensively in many industries
With.However, existing section hydraulic elevator has that operation stability is not high, it be easy to cause security risk.
Summary of the invention
It is an object of the invention to：A kind of hydraulic elevator is provided, solves the problems, such as that existing equipment operation stability is not high.
The technical solution adopted by the present invention is as follows：
A kind of hydraulic elevator, including bottom plate, one end of the bottom plate are provided with hydraulic motor, the hydraulic motor it is defeated
Shaft is connected with worm screw, and the bottom plate side is additionally provided with mounting plate one, and the two sides of the mounting plate one are hinged with gear one, tooth
Two are taken turns, is also provided with slot in the middle part of the mounting plate one, Z-type driver plate, setting in the middle part of the Z-type driver plate are provided in the slot
There is concave tooth, the concave tooth is engaged with worm screw, and the both ends of the Z-type driver plate are respectively arranged with rack gear one, rack gear two, the rack gear
One engages with one top of gear, and rack gear two is engaged with two lower part of gear, be connected with connecting rod one on gear one, connecting rod one it is another
End is hinged with connecting rod two, and connecting rod three is connected on gear two, and the other end of connecting rod three is hinged with connecting rod four, is additionally provided with T-type peace
Loading board, the both ends of the T-type mounting plate are hinged with gear three, gear four, and the gear three is connect with connecting rod two, the gear four
It is connect with connecting rod four, slot is offered in the middle part of the T-type mounting plate, Z-type mounting plate, the Z-type installation are provided in the slot
The both ends of plate are respectively arranged with rack gear three, rack gear four, and the rack gear three is engaged with three top of gear, rack gear four and four lower part of gear
Engagement, T-type mounting plate top is provided with platform.
Further, the bottom plate is arranged with pedestal, and the pedestal includes ontology, and the ontology is arranged with four liquid
Support column is pressed, the hydraulic pressure support column can stretch along the vertical direction, and four pillars, every pillar bottom are additionally provided under the ontology
End is provided with driving mechanism, and the output shaft of driving mechanism is connected with universal wheel, is additionally provided with retaining mechanism on universal wheel.
Further, the hydraulic pressure support column maximum length is greater than the sum of strut lengths and universal wheel diameter length.
Further, the hydraulic pressure support column bottom is provided with cushion.
In conclusion by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1, in the present invention, one end of bottom plate is provided with hydraulic motor, and the output shaft of the hydraulic motor is connected with worm screw, institute
It states bottom plate side and is additionally provided with mounting plate one, the two sides of the mounting plate one are hinged with gear one, gear two, the mounting plate one
Middle part is also provided with slot, is provided with Z-type driver plate in the slot, is provided with concave tooth in the middle part of the Z-type driver plate, the concave tooth with
Worm screw engagement, the both ends of the Z-type driver plate are respectively arranged with rack gear one, rack gear two, and the rack gear one is nibbled with one top of gear
It closing, rack gear two is engaged with two lower part of gear, connecting rod one is connected on gear one, the other end of connecting rod one is hinged with connecting rod two, tooth
It is connected with connecting rod three on wheel two, the other end of connecting rod three is hinged with connecting rod four, is additionally provided with T-type mounting plate, the T-type mounting plate
Both ends be hinged with gear three, gear four, the gear three is connect with connecting rod two, and the gear four is connect with connecting rod four, the T
Slot is offered in the middle part of type mounting plate, Z-type mounting plate is provided in the slot, and the both ends of the Z-type mounting plate are respectively arranged with
Rack gear three, rack gear four, the rack gear three are engaged with three top of gear, and rack gear four is engaged with four lower part of gear, the T-type mounting plate
Top is provided with platform.By the setting, hydraulic motor drives worm screw to rotate forward, and worm screw engages with the concave tooth in the middle part of Z-type driver plate
Transmission, so that Z-type driver plate be driven to move right, the rack gear one, rack gear two on Z-type driver plate move right simultaneously, band movable tooth
Wheel one, gear two rotate, and gear one drives the rotation of connecting rod one, gear two that connecting rod three is driven to rotate, connecting rod one, connecting rod three band respectively
Dynamic connecting rod two, connecting rod four rotate, then the gear three by connecting on connecting rod two, and the gear four and Z-type connected on connecting rod four is installed
Rack gear three, the cooperation transmission of rack gear four on plate, realize that the platform on T-type mounting plate rises.When needing platform to decline, hydraulic horse
It can be realized up to reversion.Worm screw is driven to keep entire lifting process more stable by hydraulic motor, while worm screw and concave tooth cooperation pass
It is dynamic, there is certain self-locking performance, improve the stability of operation.
2, the present invention in, bottom plate is arranged with pedestal, and the pedestal includes ontology, the ontology be arranged with four it is hydraulic
Support column, the hydraulic pressure support column can stretch along the vertical direction, and four pillars, every pillar bottom end are additionally provided under the ontology
It is provided with driving mechanism, the output shaft of driving mechanism is connected with universal wheel, is additionally provided with retaining mechanism on universal wheel.It is set by this
It sets, when needing movable hydraulic elevator, packs up hydraulic pressure support column, universal wheel can drive hydraulic elevator to move freely, when
When needing fixed hydraulic elevator, hydraulic pressure support column is put down, hydraulic elevator can effectively be supported, improve hydraulic liter
The stability of drop machine operation.
3, in the present invention, hydraulic pressure support column maximum length is greater than the sum of strut lengths and universal wheel diameter length.By this
Setting can make universal wheel liftoff hanging when needing hydraulic pressure support column to be supported, prevent universal wheel because stress it is excessive by
Damage.
4, in the present invention, the hydraulic pressure support column bottom is provided with cushion.By the setting, hydraulic pressure support column is being put down
When being supported, Uneven road is encountered, bumper and absorbing shock can be carried out to hydraulic pressure support column, improve the stability of operation.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the structural schematic diagram of pedestal of the present invention；
It is marked in figure：1- bottom plate, 2- hydraulic motor, 3- worm screw, 4- mounting plate one, 5- gear one, 6- gear two, 7-Z type
Driver plate, 8- concave tooth, 9- rack gear one, 10- rack gear two, 11- connecting rod one, 12- connecting rod two, 13- connecting rod three, 14- connecting rod four, 15-T
Type mounting plate, 16- gear three, 17- gear four, 18-Z type mounting plate, 19- rack gear three, 20- rack gear four, 21- platform, 22- sheet
Body, 23- hydraulic pressure support column, 24- pillar, 25- universal wheel.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
A kind of hydraulic elevator, including bottom plate 1, one end of the bottom plate 1 are provided with hydraulic motor 2, the hydraulic motor 2
Output shaft be connected with worm screw 3,1 side of bottom plate is additionally provided with mounting plate 1, and the two sides of the mounting plate 1 are hinged with
Gear 1, gear 26, one 4 middle part of mounting plate are also provided with slot, Z-type driver plate 7, the Z-type are provided in the slot
Concave tooth 8 is provided in the middle part of driver plate 7, the concave tooth 8 is engaged with worm screw 3, and the both ends of the Z-type driver plate 7 are respectively set with teeth
Item 1, rack gear 2 10, the rack gear 1 are engaged with one 5 top of gear, and rack gear 2 10 is engaged with 26 lower part of gear, gear 1
On be connected with connecting rod 1, the other end of connecting rod 1 is hinged with connecting rod 2 12, connecting rod 3 13, connecting rod is connected on gear 26
3 13 other end is hinged with connecting rod 4 14, is additionally provided with T-type mounting plate 15, and the both ends of the T-type mounting plate 15 are hingedly with teeth
3 16, gear 4 17 is taken turns, the gear 3 16 is connect with connecting rod 2 12, and the gear 4 17 is connect with connecting rod 4 14, the T-type
The middle part of mounting plate 15 offers slot, and Z-type mounting plate 18 is provided in the slot, and the both ends of the Z-type mounting plate 18 are set respectively
It is equipped with rack gear 3 19, rack gear 4 20, the rack gear 3 19 is engaged with 3 16 top of gear, and rack gear 4 20 is nibbled with 4 17 lower part of gear
It closes, 15 top of T-type mounting plate is provided with platform 21.The bottom plate 1 is arranged with pedestal, and the pedestal includes ontology 22,
The ontology 22 is arranged with four hydraulic pressure support columns 23, and the hydraulic pressure support column 23 can stretch along the vertical direction, the ontology
Four pillars 24 are additionally provided under 22, every 24 bottom end of pillar is provided with driving mechanism, and the output shaft of driving mechanism is connected with ten thousand
To wheel 25, retaining mechanism is additionally provided on universal wheel 25.23 maximum length of hydraulic pressure support column is greater than 24 length of pillar and ten thousand
To the sum of 25 diameter lengths of wheel.23 bottom of hydraulic pressure support column is provided with cushion.
In use, hydraulic motor 2 drives worm screw 3 to rotate forward to the present invention, the concave tooth at 7 middle part of worm screw 3 and Z-type driver plate
8 engaged transmissions, so that Z-type driver plate 7 be driven to move right, the rack gear 1, rack gear 2 10 on Z-type driver plate 7 move right simultaneously
Dynamic, band moving gear 1, gear 26 rotate, and gear 1 drives the rotation of connecting rod 1, gear 26 that connecting rod 3 13 is driven to rotate, even
Bar 1, connecting rod 3 13 drive connecting rod 2 12, connecting rod 4 14 to rotate respectively, then the gear three by connecting on connecting rod 2 12, even
The rack gear 3 19 on gear 4 17 and Z-type mounting plate 18, the rack gear 4 20 connected on bar 4 14, which cooperates, to be driven, and realizes T-type installation
Platform 21 on plate 15 rises.When needing platform 21 to decline, the reversion of hydraulic motor 2 be can be realized.It is driven by hydraulic motor 2
Worm screw 3 keeps entire lifting process more stable, while worm screw 3 and the cooperation of concave tooth 8 are driven, and are had certain self-locking performance, are improved operation
Stability.Bottom plate 1 is arranged with pedestal, and the pedestal includes ontology 22, and the ontology 22 is arranged with four hydraulic pressure supports
Column 23, the hydraulic pressure support column 23 can stretch along the vertical direction, and four pillars 24, every pillar are additionally provided under the ontology 22
24 bottom ends are provided with driving mechanism, and the output shaft of driving mechanism is connected with universal wheel 25, locking machine is additionally provided on universal wheel 25
Structure.By the setting, when needing movable hydraulic elevator, hydraulic pressure support column 23 is packed up, universal wheel 25 can be with hydrodynamic pressure liter
Drop machine moves freely, and when needing fixed hydraulic elevator, puts down hydraulic pressure support column 23, can carry out to hydraulic elevator effective
Support improves the stability of hydraulic elevator operation.23 maximum length of hydraulic pressure support column is greater than 24 length of pillar and universal wheel
The sum of 25 diameter lengths.By the setting, when needing hydraulic pressure support column 23 to be supported, universal wheel 25 can be made liftoff outstanding
Sky prevents universal wheel 25 from suffering damage because stress is excessive.23 bottom of hydraulic pressure support column is provided with cushion.It is set by this
It sets, when putting down hydraulic pressure support column 23 and being supported, encounters Uneven road, bumper and absorbing shock can be carried out to hydraulic pressure support column 23,
Improve the stability of operation.
Embodiment 1
A kind of hydraulic elevator, including bottom plate, one end of the bottom plate are provided with hydraulic motor, the hydraulic motor it is defeated
Shaft is connected with worm screw, and the bottom plate side is additionally provided with mounting plate one, and the two sides of the mounting plate one are hinged with gear one, tooth
Two are taken turns, is also provided with slot in the middle part of the mounting plate one, Z-type driver plate, setting in the middle part of the Z-type driver plate are provided in the slot
There is concave tooth, the concave tooth is engaged with worm screw, and the both ends of the Z-type driver plate are respectively arranged with rack gear one, rack gear two, the rack gear
One engages with one top of gear, and rack gear two is engaged with two lower part of gear, be connected with connecting rod one on gear one, connecting rod one it is another
End is hinged with connecting rod two, and connecting rod three is connected on gear two, and the other end of connecting rod three is hinged with connecting rod four, is additionally provided with T-type peace
Loading board, the both ends of the T-type mounting plate are hinged with gear three, gear four, and the gear three is connect with connecting rod two, the gear four
It is connect with connecting rod four, slot is offered in the middle part of the T-type mounting plate, Z-type mounting plate, the Z-type installation are provided in the slot
The both ends of plate are respectively arranged with rack gear three, rack gear four, and the rack gear three is engaged with three top of gear, rack gear four and four lower part of gear
Engagement, T-type mounting plate top is provided with platform.By the setting, hydraulic motor drives worm screw to rotate forward, and worm screw and Z-type pass
Concave tooth engaged transmission in the middle part of movable plate, so that Z-type driver plate be driven to move right, the rack gear one, rack gear two on Z-type driver plate are same
When move right, band moving gear one, gear two rotate, gear one drive connecting rod one rotation, gear two drive connecting rod three rotate, even
Bar one, connecting rod three drive connecting rod two, connecting rod four to rotate respectively, then the gear three by connecting on connecting rod two, connect on connecting rod four
Gear four and Z-type mounting plate on rack gear three, rack gear four cooperation be driven, realize T-type mounting plate on platform rise.Work as needs
When platform declines, hydraulic motor reversion be can be realized.Worm screw is driven to keep entire lifting process more stable by hydraulic motor, simultaneously
Worm screw and concave tooth cooperation are driven, and are had certain self-locking performance, are improved the stability of operation.
Embodiment 2
On the basis of embodiment 1, the bottom plate is arranged with pedestal, and the pedestal includes ontology, and the ontology is divided into
Four hydraulic pressure support columns are equipped with, the hydraulic pressure support column can stretch along the vertical direction, four pillars are additionally provided under the ontology,
Every pillar bottom end is provided with driving mechanism, and the output shaft of driving mechanism is connected with universal wheel, locking is additionally provided on universal wheel
Mechanism.By the setting, when needing movable hydraulic elevator, hydraulic pressure support column is packed up, universal wheel can drive hydraulic lifting
Machine moves freely, and when needing fixed hydraulic elevator, puts down hydraulic pressure support column, can effectively be propped up hydraulic elevator
Support improves the stability of hydraulic elevator operation.
Embodiment 3
On the basis of the above embodiments, the hydraulic pressure support column maximum length is greater than strut lengths and universal wheel diameter is long
The sum of degree.By the setting, when needing hydraulic pressure support column to be supported, universal wheel can be made liftoff hanging, prevent universal wheel
It suffers damage because stress is excessive.
Embodiment 4
On the basis of the above embodiments, the hydraulic pressure support column bottom is provided with cushion.By the setting, putting down
When hydraulic pressure support column is supported, Uneven road is encountered, bumper and absorbing shock can be carried out to hydraulic pressure support column, improve the stabilization of operation
Property.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (4)
1. a kind of hydraulic elevator, which is characterized in that including bottom plate (1), one end of the bottom plate (1) is provided with hydraulic motor
(2), the output shaft of the hydraulic motor (2) is connected with worm screw (3), and bottom plate (1) side is additionally provided with mounting plate one (4),
The two sides of the mounting plate one (4) are hinged with gear one (5), gear two (6), are also provided with slot in the middle part of the mounting plate one (4),
It is provided with Z-type driver plate (7), is provided with concave tooth (8) in the middle part of the Z-type driver plate (7), the concave tooth (8) and snail in the slot
Bar (3) engagement, the both ends of the Z-type driver plate (7) are respectively arranged with rack gear one (9), rack gear two (10), the rack gear one (9)
It is engaged with gear one (5) top, rack gear two (10) is engaged with gear two (6) lower part, and connecting rod one is connected on gear one (5)
(11), the other end of connecting rod one (11) is hinged with connecting rod two (12), and connecting rod three (13), connecting rod three are connected on gear two (6)
(13) the other end is hinged with connecting rod four (14), is additionally provided with T-type mounting plate (15), the both ends hinge of the T-type mounting plate (15)
It is connected to gear three (16), gear four (17), the gear three (16) connect with connecting rod two (12), the gear four (17) and connecting rod
Four (14) connect, and offer slot in the middle part of the T-type mounting plate (15), Z-type mounting plate (18), the Z are provided in the slot
The both ends of type mounting plate (18) are respectively arranged with rack gear three (19), rack gear four (20), the rack gear three (19) and gear three (16)
Top engagement, rack gear four (20) are engaged with gear four (17) lower part, and T-type mounting plate (15) top is provided with platform (21).
2. a kind of hydraulic elevator described in accordance with the claim 1, which is characterized in that the bottom plate (1) is arranged with pedestal, institute
Stating pedestal includes ontology (22), and the ontology (22) is arranged with four hydraulic pressure support columns (23), the hydraulic pressure support column (23)
It can stretch along the vertical direction, four pillars (24) are additionally provided under the ontology (22), every pillar (24) bottom end is provided with drive
Motivation structure, the output shaft of driving mechanism are connected with universal wheel (25), and universal wheel (is additionally provided with retaining mechanism on 250.
3. a kind of hydraulic elevator according to claim 2, which is characterized in that hydraulic pressure support column (23) maximum length
Greater than the sum of pillar (24) length and universal wheel (25) diameter length.
4. according to a kind of hydraulic elevator described in claim 2 or 3, which is characterized in that hydraulic pressure support column (23) bottom
It is provided with cushion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811104088.6A CN108862087A (en) | 2018-09-20 | 2018-09-20 | A kind of hydraulic elevator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811104088.6A CN108862087A (en) | 2018-09-20 | 2018-09-20 | A kind of hydraulic elevator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108862087A true CN108862087A (en) | 2018-11-23 |
Family
ID=64324404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811104088.6A Pending CN108862087A (en) | 2018-09-20 | 2018-09-20 | A kind of hydraulic elevator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108862087A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112374413A (en) * | 2020-11-16 | 2021-02-19 | 盐城工业职业技术学院 | Lifting device for automobile maintenance vehicle body |
| CN113116369A (en) * | 2021-04-23 | 2021-07-16 | 宋玮玮 | Bedside X-ray machine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104340917A (en) * | 2014-10-23 | 2015-02-11 | 昆山铄铝机电设备有限公司 | Portable electric jack |
| CN207551815U (en) * | 2017-11-29 | 2018-06-29 | 犍为三环纸业有限责任公司 | A kind of corrugated board stacking lifting gear |
-
2018
- 2018-09-20 CN CN201811104088.6A patent/CN108862087A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104340917A (en) * | 2014-10-23 | 2015-02-11 | 昆山铄铝机电设备有限公司 | Portable electric jack |
| CN207551815U (en) * | 2017-11-29 | 2018-06-29 | 犍为三环纸业有限责任公司 | A kind of corrugated board stacking lifting gear |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112374413A (en) * | 2020-11-16 | 2021-02-19 | 盐城工业职业技术学院 | Lifting device for automobile maintenance vehicle body |
| CN112374413B (en) * | 2020-11-16 | 2022-03-18 | 盐城工业职业技术学院 | Lifting device for automobile maintenance vehicle body |
| CN113116369A (en) * | 2021-04-23 | 2021-07-16 | 宋玮玮 | Bedside X-ray machine |
| CN113116369B (en) * | 2021-04-23 | 2024-02-20 | 宋玮玮 | Bedside X-ray machine |
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Application publication date: 20181123 |