CN110733875A - Automatic feeding mechanism of kinds of multi-pipeline hydraulic valve testing machines - Google Patents
Automatic feeding mechanism of kinds of multi-pipeline hydraulic valve testing machines Download PDFInfo
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- CN110733875A CN110733875A CN201911041014.7A CN201911041014A CN110733875A CN 110733875 A CN110733875 A CN 110733875A CN 201911041014 A CN201911041014 A CN 201911041014A CN 110733875 A CN110733875 A CN 110733875A
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- test
- cylinder
- test cylinder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
- B65G47/74—Feeding, transfer, or discharging devices of particular kinds or types
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
Abstract
The invention relates to an automatic feeding mechanism of a multi-pipeline hydraulic valve testing machine, which comprises a rack, wherein a test carrier matched with a product is arranged on the rack through a mounting guide rod, an upper test device is arranged at the upper part of the test carrier, a lower test device is arranged at the lower part of the test carrier, the upper test device comprises an irregular upper test frame arranged on the rack, an upper interface test cylinder, a branched pipe end interface test cylinder, a branched pipe middle interface test cylinder and a second branched pipe interface test cylinder which form a space included angle with each other are arranged on the upper test frame, and the upper interface test cylinder, the branched pipe end interface test cylinder, the branched pipe middle interface test cylinder and the second branched pipe interface test cylinder are respectively connected with an upper interface test head, a branched pipe end interface test head, a branched pipe middle interface test head and a second branched pipe interface test head which are matched with the product on the test carrier.
Description
Original application No.: 2016110311701
Application date of the original case: 2016 (11 months) and 22 days
The original case applicant: dongguan school of science and technology
The original application name is body testing machine of multi-pipeline hydraulic valves.
Technical Field
The invention relates to the field of hydraulic valve processing equipment, in particular to an automatic feeding mechanism of an multi-pipeline hydraulic valve testing machine.
Background
With the development of the hydraulic field, the application of a hydraulic device is more and more , and a hydraulic valve is used as common hydraulic elements, the demand is very , and the hydraulic valve needs to be subjected to an air tightness test in the production and processing process.
Most of existing hydraulic valve airtightness tests are performed on a single interface on the hydraulic valve through manual work or equipment, the efficiency is low, times of tests can only be performed on interfaces, for the multi-interface hydraulic valve shown in fig. 2, except for an upper interface and a lower interface, the hydraulic valve further comprises two branch pipes, interfaces are arranged in the middle of the branch pipes, and therefore when the equipment is used for testing, most of the hydraulic valve airtightness tests need manual work for material loading and butt joint, so a large amount of manpower working hours are consumed.
Disclosure of Invention
The invention aims to provide an automatic feeding mechanism of an multi-pipeline hydraulic valve testing machine, the design of a feeding device can automatically and continuously feed a test carrier, the feeding steps improve the testing efficiency, and the feeding precision is ensured by matching a screw rod and a motor.
In order to achieve the above purposes, the invention adopts the technical scheme that the automatic feeding mechanism of the multi-pipeline hydraulic valve testing machine comprises a rack 1, a test carrier 7 matched with a product 2 is installed on the rack 1 through an installation guide rod 8, an upper testing device 4 is arranged on the upper portion of the test carrier 7, a lower testing device 5 is arranged on the lower portion of the test carrier 7, the upper testing device 4 comprises an upper testing frame 41 which is arranged on the rack 1 and is in an irregular size, an upper interface testing cylinder 42, a branched pipe end interface testing cylinder 46, an branched pipe middle interface testing cylinder 48 and a second branched pipe interface testing cylinder 44 which form a space included angle with each other are arranged on the upper testing frame 41, and the upper interface testing cylinder 43 matched with an upper interface 12 of the product 2 on the test carrier 7, a branched pipe end interface testing cylinder 47 matched with an end interface 13 of a second branched pipe, a branched pipe middle interface testing head 49 matched with a middle interface 14 of the second branched pipe and a second branched pipe interface testing head 45 matched with the second branched pipe interface 15 are respectively connected with the upper interface testing head 43.
Step , frame 1 on still be provided with test carrier 7 complex loading attachment 3, loading attachment 3 including setting up the material loading seat 21 in frame 1, material loading seat 21 on be provided with material loading activity lead screw 22 and the material loading activity motor of mutually supporting, material loading activity lead screw 22 on be provided with material loading movable seat 23, material loading movable seat 23 on be provided with product 2 cooperation and with the material loading carrier 26 of test carrier 7 butt joint.
Step , material loading carrier 26 including setting up the carrier seat 27 on material loading sliding seat 23, carrier seat 27 on be provided with product 2 main part complex holder 28 and bottom grip block 29, holder 28 on be provided with product 2 complex chucking post 30, chucking post 30 be connected with chucking swivel mount 31, chucking swivel mount 31 and the cooperation of the chucking handle 32 that sets up on the holder 28.
Step , the carrier seat 27 is evenly provided with at least two groups of material clamping seats 28 and bottom clamping blocks 29, the material loading movable seat 23 is provided with a material loading clamping position matching block 24, and the material loading clamping position matching block 24 is matched with a material loading clamping position handle 25 arranged on the frame 1.
, the lower testing device 5 comprises a lower interface testing lifting cylinder 51 sleeved on the installation guide rod 8, the upper part of the lower interface testing lifting cylinder 51 is connected with a lower interface testing lifting seat 52, a lower interface testing head 53 penetrating through the testing carrier 7 is arranged on the lower interface testing lifting seat 52, and the lower interface testing head 53 is in sleeved fit with the lower part of the product 2.
, the lower interface testing lifting seat 52 is provided with a rotating device 54 which enables the lower interface testing head 53 to rotate, the rotating device 54 comprises a rotating seat 65 arranged on the lower interface testing lifting seat 52, the rotating seat 65 is provided with a rotating rack 66 engaged with a gear sleeved on the lower interface testing head 53, and the rotating seat 65 is provided with a rack pulling cylinder 67 matched with the rotating rack 66.
, the lower part of the lower interface test head 53 is sleeved with a lower limit block 55, the lower limit block 55 is arranged on a lower limit seat 57 sleeved on the installation guide rod 8, and a lower limit plate 56 is provided with a limit hole matched with the top at the bottom of the lower limit block 55.
, the top of lower interface test lifting seat 52 is cooperated with an upper limiting device, the upper limiting device comprises an upper limiting lifting cylinder 59 arranged on the frame 1, the upper limiting lifting cylinder 59 is connected with an upper limiting lifting rod 60 passing through the lower limiting plate 56, the upper limiting lifting rod 60 is provided with an upper surface matched upper limiting plate 61 with the lower interface test lifting seat 52, and the lower interface test head 53 passes through the upper limiting plate 61.
, a lower limiting clamping cylinder 58 is arranged on the lower limiting seat 57, and a lower limiting clamping block matched with the lower limiting plate 56 is connected to the lower limiting clamping cylinder 58.
, the upper limiting plate 61 is connected with the upper limiting return device 6, the upper limiting return device 6 comprises an upper limiting return pull rope 62 connected with the upper part of the upper limiting plate 61, the upper limiting return pull rope 62 is matched with a pull rope reversing seat 63 arranged on the rack 1, and the tail end of the upper limiting return pull rope 62 is connected with an upper limiting return heavy block 64.
The invention has the beneficial effects that:
1. the test carrier matched with the lower portion of the hydraulic valve is arranged, the upper portion of the test carrier is provided with the upper portion test device, the lower portion of the test carrier is provided with the lower portion test device, the upper portion test device can conduct -time test on -time multiple upper portion interfaces and all branch pipe interfaces, test efficiency is greatly improved, and test time cost is reduced.
2. The design of loading attachment can advance step improvement test's efficiency to the automatic continuous material loading of test carrier, and feeds through lead screw and motor cooperation, has ensured the precision of material loading.
3. The feeding carrier is simple in structure, convenient to operate and capable of being clamped and loosened through the handle.
4. The cooperation design of material loading screens cooperation piece and material loading screens handle can ensure that package material loading sliding seat can not take place the migration when placing the product to the material loading carrier, advances steps and ensures the precision of follow-up material loading.
5. The lower part testing device is simple in structure and convenient to operate, the lower part of the product can be sleeved and clamped through the lower part interface testing head, the structure of the testing carrier is simplified, and the testing efficiency of the product is further improved by steps.
6. The design of rotating device can make the lower part test head rotate, and then can finely tune the product, makes a great deal of interface on upper portion can with the accurate butt joint of test head on upper portion, improves the precision of test, and rotating device's simple structure, design benefit can not interfere to going up and down.
7. The maximum descending amplitude of the lower testing head can be limited by the matching design of the lower limiting block and the lower limiting plate, so that the condition that the descending amplitude is too large can be prevented, and the ascending and descending energy can be saved.
8. The design of the upper limiting device can limit the maximum ascending amplitude of the lower testing head, so that the situation that the upper limiting device collides with the testing carrier due to the overlarge ascending amplitude can be prevented, and the upper limiting device is simple in structure and convenient to operate.
9. The design of the lower limiting clamping cylinder and the lower limiting clamping block can enable the lower limiting plate to be clamped, so that the lower limiting plate can be prevented from being influenced by the upper limiting device, and meanwhile, a limiting effect can be achieved on the ascending of the upper limiting device.
10. The upper limiting and restoring device can keep the upper limiting plate in a stress balance state constantly through the heavy block and the pull rope, and the lifting stability can be improved.
Drawings
FIG. 1 is a schematic perspective view of an automatic feeding mechanism of an multi-pipeline hydraulic valve testing machine;
FIG. 2 is a schematic perspective view of a multi-line hydraulic valve;
FIG. 3 is a schematic perspective view of the feeding device;
FIG. 4 is a perspective view of the loading carrier;
FIG. 5 is a schematic perspective view of a loading device and a lower joint testing device;
FIG. 6 is a perspective view of the upper test apparatus;
FIG. 7 is a perspective view of the lower splice testing device;
FIG. 8 is a perspective view of the lower joint testing device with the test carrier removed;
fig. 9 is a perspective view of the lower joint testing device with the upper limit return device removed.
The text labels shown in the figure are 1, a rack, 2, a product, 3, a feeding device, 4, an upper testing device, 5, a lower testing device, 6, an upper limit recovery device, 7, a testing carrier, 8, a mounting guide rod, 11, a main body, 12, an upper interface, 13, a -th sub-tube end interface, 14, a -th sub-tube middle interface, 15, a second sub-tube interface, 21, a feeding seat, 22, a feeding movable screw rod, 23, a feeding movable seat, 24, a feeding clamping matching block, 25, a feeding clamping handle, 26, a feeding carrier, 27, a carrier seat, 28, a clamping seat, 29, a bottom clamping block, 30, a clamping column, 31, a clamping swivel seat, 32, a clamping handle, 41, an upper testing frame, 42, an upper interface testing cylinder, 43, an upper interface testing head, 44, a second sub-tube interface testing cylinder, 45, a second sub-tube interface testing head, 46, a fourth sub-tube interface testing cylinder, a 32, a lower testing cylinder, a lower testing rack, 54, an upper interface testing cylinder, an upper interface testing head, a lower limiting block, a pulling lifting cylinder, a lower limiting block, a pulling cylinder, a lower limiting block, a lower rack, a pulling block, a pulling cylinder.
Detailed Description
The following detailed description of the present invention is given for the purpose of better understanding technical solutions of the present invention by those skilled in the art, and the present description is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.
As shown in fig. 1-9, the automatic feeding mechanism of multi-pipeline hydraulic valve testing machines comprises a frame 1, a test carrier 7 matched with a product 2 is mounted on the frame 1 through a mounting guide rod 8, an upper testing device 4 is arranged on the upper portion of the test carrier 7, a lower testing device 5 is arranged on the lower portion of the test carrier 7, the upper testing device 4 comprises an off-specification upper testing frame 41 arranged on the frame 1, an upper interface testing cylinder 42, a branched pipe end interface testing cylinder 46, a branched pipe middle interface testing cylinder 48 and a second branched pipe interface testing cylinder 44 which form a spatial included angle with each other are arranged on the upper testing frame 41, and are respectively connected with an upper interface testing head 43 matched with an upper interface 12 of the product 2 on the test carrier 7, a branched pipe end interface testing head 47 matched with a branched pipe end interface 13, a branched pipe middle interface testing head 49 matched with a branched pipe middle interface 14 and a second branched pipe interface testing head 45 matched with a 3515.
Preferably, frame 1 on still be provided with test carrier 7 complex loading attachment 3, loading attachment 3 including setting up the material loading seat 21 in frame 1, material loading seat 21 on be provided with material loading movable screw rod 22 and the material loading activity motor of mutually supporting, material loading movable screw rod 22 on be provided with material loading movable seat 23, material loading movable seat 23 on be provided with product 2 cooperation and with the material loading carrier 26 of test carrier 7 butt joint.
Preferably, material loading carrier 26 including setting up the carrier seat 27 on material loading sliding seat 23, carrier seat 27 on be provided with product 2 main part complex holder 28 and bottom grip block 29, holder 28 on be provided with product 2 complex chucking post 30, chucking post 30 be connected with chucking swivel mount 31, chucking swivel mount 31 and the cooperation of the chucking handle 32 that sets up on the holder 28.
Preferably, the carrier seat 27 is uniformly provided with at least two groups of material clamping seats 28 and bottom clamping blocks 29, the material loading movable seat 23 is provided with a material loading clamping position matching block 24, and the material loading clamping position matching block 24 is matched with a material loading clamping position handle 25 arranged on the frame 1.
Preferably, the lower testing device 5 includes a lower interface testing lifting cylinder 51 sleeved on the installation guide rod 8, the upper part of the lower interface testing lifting cylinder 51 is connected with a lower interface testing lifting seat 52, a lower interface testing head 53 passing through the testing carrier 7 is arranged on the lower interface testing lifting seat 52, and the lower interface testing head 53 is in sleeved fit with the lower part of the product 2.
Preferably, the lower interface testing lifting seat 52 is provided with a rotating device 54 for rotating the lower interface testing head 53, the rotating device 54 comprises a rotating seat 65 arranged on the lower interface testing lifting seat 52, the rotating seat 65 is provided with a rotating rack 66 engaged with a gear sleeved on the lower interface testing head 53, and the rotating seat 65 is provided with a rack pulling cylinder 67 matched with the rotating rack 66.
Preferably, the lower part of the lower interface test head 53 is sleeved with a lower limit block 55, the lower limit block 55 is arranged on a lower limit seat 57 sleeved on the installation guide rod 8, and a lower limit plate 56 is provided with a limit hole matched with a top at the bottom of the lower limit block 55.
Preferably, the top cooperation of lower part interface test lift seat 52 have an upper portion stop device, upper portion stop device including setting up the spacing lift cylinder 59 in upper portion in frame 1, the spacing lift cylinder 59 top in upper portion be connected with the spacing lifter 60 in upper portion that passes lower part limiting plate 56, the spacing lifter 60 in upper portion be provided with the upper surface cooperation upper portion limiting plate 61 of lower part interface test lift seat 52, and lower part interface test head 53 passes upper portion limiting plate 61.
Preferably, the lower limiting seat 57 is provided with a lower limiting clamping cylinder 58, and the lower limiting clamping cylinder 58 is connected with a lower limiting clamping block matched with the lower limiting plate 56.
Preferably, the upper limiting plate 61 is connected with an upper limiting and returning device 6, the upper limiting and returning device 6 comprises an upper limiting and returning pull rope 62 connected with the upper portion of the upper limiting plate 61, the upper limiting and returning pull rope 62 is matched with a pull rope reversing seat 63 arranged on the rack 1, and the tail end of the upper limiting and returning pull rope 62 is connected with an upper limiting and returning weight 64.
When the hydraulic valve is used specifically, a feeding clamping position matching block 24 is clamped through a feeding clamping position handle 25, a product 2 is placed on a material clamping seat 28, the lower portion of the product is matched with a bottom clamping block 29, a clamping column 30 is driven by a clamping handle 32 to clamp the product, the feeding clamping position handle 25 is separated from the feeding clamping position matching block 24, a feeding movable screw rod 22 is driven by a feeding movable motor to rotate, a feeding movable seat 23 is driven to feed, the lower portion of an th product 2 is inserted into a lower interface testing head 53, a feeding carrier 26 is loosened, the position of an upper limiting plate 61 is adjusted through an upper limiting cylinder 59, a lower interface testing lifting cylinder 51 drives the lower interface testing head 53 to ascend, a rack pulling cylinder 67 drives a rotating rack 66 to move, the lower interface testing head 53 is driven by a gear to rotate, the position of the product 2 is adjusted, each testing head is driven by each testing cylinder of an upper testing device 4 to be respectively in butt joint matching with an interface on the product 2, and then the testing efficiency of a multi-interface hydraulic valve is improved.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises the series of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The principle and embodiments of the present invention have been described herein by way of specific examples, which are provided only to help understand the method and the core idea of the present invention, and the above is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes can be made without departing from the principle of the present invention, and the above technical features can also be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments.
Claims (5)
- The automatic feeding mechanism of the multi-pipeline hydraulic valve testing machine comprises a rack (1), and is characterized in that a test carrier (7) matched with a product (2) is installed on the rack (1) through an installation guide rod (8), a lower test device (5) is arranged at the part of the test carrier (7), a feeding device (3) matched with the test carrier (7) is further arranged on the rack (1), the feeding device (3) comprises a feeding seat (21) arranged on the rack (1), a feeding movable screw rod (22) and a feeding movable motor which are mutually matched are arranged on the feeding seat (21), a feeding movable seat (23) is arranged on the feeding movable screw rod (22), a feeding carrier (26) which is matched with the product (2) and butted with the test carrier (7) is arranged on the feeding seat (21), the feeding carrier (26) comprises a feeding carrier seat (27) arranged on the feeding seat (23), a feeding rack (27) is arranged on the feeding movable seat (23) and a feeding carrier (52) matched with the test carrier (7) in a rotating manner, a lower test cylinder (52) is arranged on the lower test carrier (28), a lower test carrier (23) which is arranged on the lower test seat, a test carrier (23) and a test cylinder (23) which is arranged on the lower test seat, a test cylinder (23) and a test cylinder (52) which is arranged on the lower test cylinder (23), the lower test cylinder (23) and a test cylinder (52) which is arranged on the lower test cylinder (7), the lower test cylinder (52) and is arranged on the lower test cylinder (23), the lower test cylinder (52), the lower test cylinder (23), the lower test cylinder (52) and the lower test cylinder (23), the test cylinder (52) is arranged on the test cylinder (23), the lower test cylinder (23), the test cylinder (52) is arranged on the lower interface, the lower test cylinder (23), the test cylinder (52) and the test cylinder (52) is arranged on the test cylinder (52) and the test cylinder (52), the test cylinder (23), the lower interface, the test cylinder (52) is arranged on the test cylinder (52) and the test cylinder (52), the test cylinder (52) and the test cylinder (52) is arranged on the test cylinder (52) and the test cylinder (23), the test cylinder (52) and the test cylinder (52) are arranged on the test cylinder (23).
- 2. The automatic feeding mechanism of kinds of multi-pipeline hydraulic valve testing machines of claim 1, wherein the lower part of the lower interface test head (53) is sleeved with a lower limiting block (55), the lower limiting block (55) is arranged on a lower limiting seat (57) sleeved on the installation guide rod (8), and a limiting hole matched with the top of the bottom of the lower limiting block (55) is formed in the lower limiting plate (56).
- 3. The automatic feeding mechanism of kinds of multi-pipeline hydraulic valve testing machines according to claim 2, wherein, the upper part of the lower interface test lifting seat (52) is fitted with an upper limiting device, the upper limiting device comprises an upper limiting lifting cylinder (59) arranged on the frame (1), an upper limiting lifting rod (60) passing through the lower limiting plate (56) is connected above the upper limiting lifting cylinder (59), an upper limiting plate (61) fitted with the upper surface of the lower interface test lifting seat (52) is arranged above the upper limiting lifting rod (60), and the lower interface test head (53) passes through the upper limiting plate (61).
- 4. The automatic feeding mechanism of kinds of multi-pipeline hydraulic valve testing machines according to claim 3, wherein the lower limiting seat (57) is provided with a lower limiting clamping cylinder (58), and the lower limiting clamping cylinder (58) is connected with a lower limiting clamping block which is matched with the lower limiting plate (56).
- 5. The automatic feeding mechanism of the kinds of multi-pipeline hydraulic valve testing machines of claim 3, wherein the upper limiting plate (61) is connected with an upper limiting and returning device (6), the upper limiting and returning device (6) comprises an upper limiting and returning pull rope (62) connected with the upper portion of the upper limiting plate (61), the upper limiting and returning pull rope (62) is matched with a pull rope reversing seat (63) arranged on the machine frame (1), and the tail end of the upper limiting and returning pull rope (62) is connected with an upper limiting and returning weight (64).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911041014.7A CN110733875A (en) | 2016-11-22 | 2016-11-22 | Automatic feeding mechanism of kinds of multi-pipeline hydraulic valve testing machines |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911041014.7A CN110733875A (en) | 2016-11-22 | 2016-11-22 | Automatic feeding mechanism of kinds of multi-pipeline hydraulic valve testing machines |
| CN201611031170.1A CN106568551B (en) | 2016-11-22 | 2016-11-22 | Integrated test machine of multi-pipeline hydraulic valve |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611031170.1A Division CN106568551B (en) | 2016-11-22 | 2016-11-22 | Integrated test machine of multi-pipeline hydraulic valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110733875A true CN110733875A (en) | 2020-01-31 |
Family
ID=58542883
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611031170.1A Expired - Fee Related CN106568551B (en) | 2016-11-22 | 2016-11-22 | Integrated test machine of multi-pipeline hydraulic valve |
| CN201911041014.7A Pending CN110733875A (en) | 2016-11-22 | 2016-11-22 | Automatic feeding mechanism of kinds of multi-pipeline hydraulic valve testing machines |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611031170.1A Expired - Fee Related CN106568551B (en) | 2016-11-22 | 2016-11-22 | Integrated test machine of multi-pipeline hydraulic valve |
Country Status (1)
| Country | Link |
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| CN (2) | CN106568551B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109141755B (en) * | 2018-09-05 | 2024-01-23 | 宁波博大机械有限公司 | Comprehensive measuring device |
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- 2016-11-22 CN CN201611031170.1A patent/CN106568551B/en not_active Expired - Fee Related
- 2016-11-22 CN CN201911041014.7A patent/CN110733875A/en active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106568551A (en) | 2017-04-19 |
| CN106568551B (en) | 2019-12-17 |
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Application publication date: 20200131 |