CN210589722U - Automatic material machine of opening of door plant - Google Patents
Automatic material machine of opening of door plant Download PDFInfo
- Publication number
- CN210589722U CN210589722U CN201920982941.8U CN201920982941U CN210589722U CN 210589722 U CN210589722 U CN 210589722U CN 201920982941 U CN201920982941 U CN 201920982941U CN 210589722 U CN210589722 U CN 210589722U
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- platform
- pushing
- seat
- door plate
- conveying
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- 239000000463 material Substances 0.000 title claims description 14
- 230000007246 mechanism Effects 0.000 claims abstract description 84
- 238000005520 cutting process Methods 0.000 claims abstract description 28
- 238000007599 discharging Methods 0.000 claims abstract description 8
- 238000003466 welding Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000002023 wood Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 235000013547 stew Nutrition 0.000 description 1
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Abstract
The utility model relates to a plank production technical field, the utility model discloses a technical scheme does: an automatic door plate cutting machine comprises a feeding platform, wherein the feeding platform comprises a feeding frame and a first lifting mechanism arranged at the lower end of the feeding frame, and a door plate is positioned at the feeding frame and driven to ascend or descend by the first lifting mechanism; the conveying platform comprises a conveying rack and a plurality of fixing rods welded at the upper end of the conveying rack, and a plurality of conveying wheels are uniformly fixed on the surfaces of the fixing rods; the working platform is positioned on the right side of the transportation platform; the pushing and positioning mechanism is used for pushing the door plate from the feeding frame to the working platform through the conveying platform to be positioned; the cutting mechanism is arranged at the lower end of the working platform; and the discharging platform is positioned on the right side of the working platform and is connected with the working platform.
Description
Technical Field
The utility model relates to a plank production technical field especially involves an automatic material machine of opening of door plant.
Background
The door plant need open the material to it in the course of working, and present plank is the manual work mostly when production and carries the plank to opening the material platform fixed length cutting, adopts manual propulsion moreover, but this kind of mode is because plank weight is too big, appears colliding with in the handling easily for production efficiency is very low.
Therefore, there is a need for an improved structure that overcomes the above-mentioned deficiencies.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an automatic material machine of opening of door plant.
The above technical purpose of the utility model is realized with following technical scheme:
an automatic door plate cutting machine comprises a feeding platform, wherein the feeding platform comprises a feeding frame and a first lifting mechanism arranged at the lower end of the feeding frame, and a door plate is positioned at the feeding frame and driven to ascend or descend by the first lifting mechanism;
the conveying platform comprises a conveying rack and a plurality of fixing rods welded at the upper end of the conveying rack, and a plurality of conveying wheels are uniformly fixed on the surfaces of the fixing rods;
the working platform is positioned on the right side of the transportation platform;
the pushing and positioning mechanism is used for pushing the door plate from the feeding frame to the working platform through the conveying platform to be positioned;
the cutting mechanism is arranged at the lower end of the working platform;
and the discharging platform is positioned on the right side of the working platform and is connected with the working platform.
The utility model discloses a further set up to: the feeding frame comprises a feeding frame and a plurality of conveying rollers arranged in the feeding frame, and the first lifting mechanism is a hydraulic lifting platform.
The utility model discloses a further set up to: the transportation rack is formed by combining and welding a plurality of upright posts and crosspieces, and a plurality of fixing rods are arranged in parallel; the left side of the transportation rack is also fixedly provided with a guide mechanism, the guide mechanism is positioned between the feeding rack and the transportation platform, the guide mechanism comprises a plurality of fixed plates fixed at the transportation rack and positioning plates fastened to the front side and the rear side of the fixed plates through bolts, auxiliary wheels are fixed at the positioning plates, and the height of the auxiliary wheels is higher than that of the conveying wheels.
The utility model discloses a further set up to: the working platform comprises a first frame, a first panel arranged on the left side of the upper end of the first frame and a second panel arranged on the right side of the upper end of the first frame, a saw blade channel is arranged between the first panel and the second panel, and a plurality of positioning pin holes are formed in the surface of the second panel.
The utility model discloses a further set up to: the pushing and positioning mechanism comprises two pushing and positioning racks which are symmetrically arranged, a pushing seat which is arranged at the pushing and positioning racks in a sliding mode and a pushing mechanism which is connected with the pushing seat.
The utility model discloses a further set up to: the pushing and positioning machine frame comprises a first supporting column and a second supporting column which are vertically arranged at the upper end of the ground, a first connecting plate arranged at the upper ends of the first supporting column and the second supporting column, a first servo motor fixed at the right side end of the first connecting plate, two first sliding rails fastened at the first connecting plate through bolts, a first sliding block arranged at the first sliding rail in a sliding manner, a first lead screw connected with the first servo motor through a first coupler, and a first moving seat fastened at the first sliding block through bolts and screwed with the first lead screw; first support column is located feeding platform's left side, the second support column is located work platform's right side, first slide rail is the level setting, first removal seat is L shape structure, a side of first removal seat runs through there is first screw hole, first screw hole with first lead screw suits, first servo motor is used for driving the removal that the seat carries out left right direction.
The utility model discloses a further set up to: the pushing seat comprises a first fixing plate, two second sliding rails fastened at the first fixing plate through bolts, a second sliding block arranged at the second sliding rails in a sliding mode, a second servo motor fixed at the rear end of the first fixing plate, and a second lead screw connected with the output shaft end of the second servo motor through a second coupler, the first fixing plate is fixed at the other side edge of the first moving seat, a pushing plate is fastened to the right side face of the second sliding block through bolts and is vertically arranged, a lead screw sliding seat protrudes from the middle of the left side of the pushing plate, the second lead screw is in threaded connection with the lead screw sliding seat and extends to the front side of the lead screw sliding seat, and the second servo motor is used for driving the pushing mechanism to move in the front-back direction.
The utility model discloses a further set up to: the pushing mechanism comprises a Z-axis linear module and a pushing block fixed at the position of a sliding block of the Z-axis linear module, the pushing block is of an L-shaped structure, and the Z-axis linear module is used for driving the pushing block to move in the up-and-down direction.
The utility model discloses a further set up to: the cutting mechanism comprises a second lifting mechanism which is a hydraulic lifting platform, a mechanical sliding table is fixed at the upper end of the second lifting mechanism, an electric saw is fixed at the upper end of the mechanical sliding table, and a saw blade of the electric saw is matched with a saw blade channel;
the second lifting mechanism is arranged in the first machine frame and used for driving the mechanical sliding table to ascend or descend, and the mechanical sliding table is used for driving a saw blade of the electric saw to move in the front-back direction.
The utility model discloses a further set up to: the discharging platform is three belt conveyors arranged at intervals.
To sum up, the utility model discloses following beneficial effect has:
the utility model relates to a novel ingenious drives the plank through hydraulic pressure lift platform and goes up and down, promotes positioning mechanism plank and carries out the propelling movement location, and the cutting mechanism cuts, and the back ejection of compact is accomplished in the cutting, and this has improved production efficiency at to a great extent, has practiced thrift manpower resources.
Drawings
Fig. 1 is a top view of the automatic door plate cutting machine provided by the present invention.
Fig. 2 is a front view of the loading platform.
Fig. 3 is a front view of the transport platform.
Fig. 4 is a left side view of the guide mechanism.
Fig. 5 is a schematic structural view of the push positioning mechanism.
Fig. 6 is a right side view of the push bench.
Fig. 7 is a front view of the pushing mechanism.
Fig. 8 is a side view of the blanking mechanism.
The corresponding part names indicated by the numbers and letters in the drawings:
wherein: 1-a feeding platform; 2-a transportation platform; 3-a working platform; 4-pushing the positioning mechanism; 5-a cutting mechanism; 6-a discharging platform; 7-a guide mechanism; 11-a feeding frame; 12-a first lifting mechanism; 21-a transport frame; 22-a fixation rod; 23-a delivery wheel; 31-a first gantry; 32-a first panel; 33-a second panel; 41-pushing the positioning mechanism; 42-a pushing seat; 43-a pushing mechanism; 411 — first support column; 412-a second support column; 413-first connecting plate; 414-a first servomotor; 415-a first sliding rail; 416-a first lead screw; 417 — a first movable mount; 421-a first fixing plate; 422-a second sliding rail; 423-second servomotor; 424-second lead screw; 425-a pusher plate; 431-Z axis straight line module; 432-a push block; 51-a second lifting mechanism; 52-mechanical slide; 53-electric saw; 71-a fixing plate; 72-positioning plate; 73-auxiliary wheel.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention will be further described with reference to the drawings and the specific embodiments.
Referring to fig. 1, the utility model provides an automatic door plank cutting machine, which comprises a feeding platform 1, wherein the feeding platform 1 comprises a feeding frame 11 and a first lifting mechanism 12 arranged at the lower end of the feeding frame 11, and a door plank is located at the feeding frame 11 and driven to ascend or descend by the first lifting mechanism 12; the transportation platform 2 comprises a transportation rack 21 and a plurality of fixing rods 22 welded at the upper end of the transportation rack 21, wherein a plurality of conveying wheels 23 are uniformly fixed on the surfaces of the fixing rods 22; the working platform 3 is positioned on the right side of the transportation platform 2; the pushing and positioning mechanism 4 is used for pushing the door plate from the feeding frame 11 to the working platform 3 through the transportation platform 2 for positioning; the cutting mechanism 5 is arranged at the lower end of the working platform 3; and the discharging platform 6 is positioned on the right side of the working platform 3 and is connected with the working platform 3.
By adopting the technical scheme: fork truck will pile up the plank and place in material loading platform 1 department and stew, when needs are opened the material, work or material rest 11 rises in the control of first elevating system 12, the plank promotes along with the rising of material loading frame 11, when the plank rises to a take the altitude, promote positioning mechanism 4 with plank propelling movement to transport platform 2 department, then promote positioning mechanism 4 and drive the plank and remove to work platform 3 department, next open material mechanism 5 and carry out work, wait to open the material and accomplish the back, the plank delivers out through ejection of compact platform 6.
Referring to fig. 2, the feeding frame 11 includes a feeding frame and a plurality of conveying rollers disposed in the feeding frame, and the first lifting mechanism 12 is a hydraulic lifting platform; wherein, the feeding frame 11 is a square frame.
By adopting the technical scheme: because the weight of plank is too big, if adopt the manual work to carry, this can make handling efficiency low, adopts hydraulic pressure lift platform can improve pay-off efficiency.
As shown in fig. 3 and 4, the transportation frame 21 is formed by welding a plurality of columns and crosspieces, and a plurality of fixing rods 22 are arranged in parallel; a guide mechanism 7 is further fixed on the left side of the transportation frame 21, the guide mechanism 7 is located between the feeding frame 11 and the transportation platform 2, the guide mechanism 7 includes a plurality of fixing plates 71 fixed on the transportation frame 21 and positioning plates 72 fastened to the front and rear sides of the fixing plates 71 through bolts, auxiliary wheels 73 are fixed on the positioning plates 72, and the heights of the auxiliary wheels 73 are higher than the heights of the conveying wheels 23.
By adopting the technical scheme: the loading platform 1 stops moving when the wood board rises to a certain height, then the positioning mechanism 4 is pushed to work to push the wood board to the transportation platform 2, and the auxiliary wheels 73 arranged by the guide mechanism 7 can avoid the wood board from colliding in the transportation process.
The working platform 3 comprises a first frame 31, a first panel 32 arranged on the left side of the upper end of the first frame 31 and a second panel 33 arranged on the right side of the upper end of the first frame 31, a saw blade channel is arranged between the first panel 32 and the second panel 33, and the surface of the second panel 33 is provided with a plurality of positioning pin holes.
As shown in fig. 8, the cutting mechanism 5 includes a second lifting mechanism 51, the second lifting mechanism 51 is a hydraulic lifting platform, a mechanical sliding table 52 is fixed at the upper end of the second lifting mechanism, an electric saw 53 is fixed at the upper end of the mechanical sliding table 52, and a saw blade of the electric saw 53 is adapted to a saw blade channel;
the second lifting mechanism 51 is disposed inside the first frame 31, the second lifting mechanism 51 is used for driving the mechanical sliding table 52 to ascend or descend, and the mechanical sliding table 52 is used for driving a saw blade of the electric saw to move in the front-back direction.
By adopting the technical scheme: according to the plank width of cutting the saw as required, the round pin axle is pegged graft in the locating pin hole, thereby location pushing mechanism 4 promotes the plank this moment and makes plank and round pin axle contact and accomplish the location, location pushing mechanism 4 stop work, and then control second elevating system 51 control machinery slip table 52 and rise for the saw bit of electric saw exceeds the height of plank, then electric saw work, thereby machinery slip table 52 drives electric saw work and cuts the plank.
As shown in fig. 5, 6 and 7, the pushing and positioning mechanism 4 includes two symmetrically disposed pushing and positioning frames 41, a pushing seat 42 slidably disposed at the pushing and positioning frames 41, and a pushing mechanism 43 connected to the pushing seat 42;
the pushing and positioning frame 41 includes a first supporting column 411 and a second supporting column 412 vertically disposed on the upper end of the ground, a first connecting plate 413 disposed on the upper ends of the first supporting column 411 and the second supporting column 412, a first servo motor 414 fixed on the right end of the first connecting plate 413, two first sliding rails 415 fastened to the first connecting plate 413 by bolts, a first sliding block slidably disposed on the first sliding rails 415, a first lead screw 416 connected to the first servo motor 414 by a first coupling, and a first moving seat 417 fastened to the first sliding block by bolts and threadedly connected to the first lead screw 416; the first supporting column 411 is located on the left side of the feeding platform 1, the second supporting column 412 is located on the right side of the working platform 3, the first sliding rail 415 is horizontally arranged, the first moving seat 417 is an L-shaped structure, a first threaded hole penetrates through one side edge of the first moving seat 417, the first threaded hole is adapted to the first lead screw 417, and the first servo motor 414 is used for driving the pushing seat 42 to move in the left-right direction;
the pushing seat 42 includes a first fixing plate 421, two second sliding rails 422 fastened to the first fixing plate 421 by bolts, a second slider slidably disposed at the second sliding rails 422, a second servo motor 423 fixed to a rear end of the first fixing plate 421, and a second lead screw 424 connected to an output shaft of the second servo motor 423 through a second coupling, the first fixing plate 421 is fixed to the other side of the first moving seat 417, a pushing plate 425 is fastened to a right side surface of the second slider by bolts, the pushing plate 425 is vertically disposed, a lead screw sliding seat protrudes from a left middle portion of the pushing plate 425, the second lead screw 424 is screwed to the lead screw sliding seat and extends to a front side of the lead screw sliding seat, and the second servo motor 423 is used for driving the pushing mechanism 43 to move in a front-back direction;
the pushing mechanism 43 comprises a Z-axis linear module 431 and a pushing block 432 fixed at a sliding block of the Z-axis linear module 431, the pushing block 432 is of an L-shaped structure, and the Z-axis linear module 431 is used for driving the pushing block 432 to move in the up-and-down direction.
By adopting the technical scheme: the pushing and positioning frame 41 is used for driving the pushing seat 42 to move in the left-right direction, that is, in the Y-axis direction, the first moving seat 417 is an L-shaped structure, the first moving seat includes a first moving plate and a second moving plate vertically welded to the front side of the first moving plate, the first moving plate has a first threaded hole, the first moving plate is in threaded connection with the first lead screw 417, the first moving plate is connected with the two first sliders, the pushing seat 42 is fixed to the right side surface of the second moving plate, that is, the first fixing plate 421 is fixed to the right side surface of the second moving plate, the pushing seat 42 is used for driving the pushing mechanism 43 to move in the front-back direction, that is, in the X-axis direction, and the Z-axis linear module 431 drives the pushing block 432 to move up and down, that is, in the Z-axis direction, so as to achieve.
Preferably, the discharging platform 6 is three belt conveyors arranged at intervals.
The utility model discloses a theory of operation: the forklift puts the stacked wood boards on the feeding platform 1, the feeding platform 1 works to lift the wood boards to a height higher than that of the transportation platform 2, then the positioning pushing mechanism 4 pushes the wood boards to the right side, in the process of pushing the wood board, the wood board is firstly contacted with the auxiliary wheel 73 of the guide mechanism 7, thereby avoiding the wood board from colliding in the transportation process, then the positioning pushing mechanism 4 moves the wood board to the working platform 3 through the conveying wheels 23, the arrangement of the plurality of conveying wheels 23 reduces the friction force to a great extent, is beneficial to the pushing of the wood board, manually inserts pin shafts at the second panel 33 according to the width of the cut material, then the positioning pushing mechanism 4 pushes the wood board to enable the wood board to be in contact with the pin shaft so as to be positioned, the positioning pushing mechanism 4 is kept still, the cutting mechanism 5 cuts the wood board, the pin shaft is taken down after the cutting is finished, and the positioning pushing mechanism 4 pushes the wood board out.
The utility model discloses hydraulic lifting platform, Z axle straight line module, electric saw that adopt are prior art, and the relevant technical staff in this field can choose for use according to the actual demand.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The automatic door plate cutting machine is characterized by comprising a feeding platform (1), wherein the feeding platform (1) comprises a feeding frame (11) and a first lifting mechanism (12) arranged at the lower end of the feeding frame (11), and a door plate is positioned at the feeding frame (11) and driven to ascend or descend by the first lifting mechanism (12);
the conveying platform (2) comprises a conveying rack (21) and a plurality of fixing rods (22) welded at the upper end of the conveying rack (21), and a plurality of conveying wheels (23) are uniformly fixed on the surfaces of the fixing rods (22);
the working platform (3) is positioned at the right side of the transportation platform (2);
the pushing and positioning mechanism (4) is used for pushing the door plate from the feeding frame (11) to the working platform (3) through the transportation platform (2) for positioning;
the cutting mechanism (5) is arranged at the lower end of the working platform (3);
and the discharging platform (6) is positioned on the right side of the working platform (3) and is connected with the working platform (3).
2. The automatic door plate cutting machine according to claim 1, characterized in that: the feeding frame (11) comprises a feeding frame and a plurality of conveying rollers arranged in the feeding frame, and the first lifting mechanism (12) is a hydraulic lifting platform.
3. The automatic door plate cutting machine according to claim 1, characterized in that: the transportation rack (21) is formed by combining and welding a plurality of upright posts and crosspieces, and a plurality of fixing rods (22) are arranged in parallel; a guide mechanism (7) is further fixed on the left side of the conveying rack (21), the guide mechanism (7) is located between the feeding rack (11) and the conveying platform (2), the guide mechanism (7) comprises a plurality of fixing plates (71) fixed on the conveying rack (21) and positioning plates (72) fastened to the front side and the rear side of the fixing plates (71) through bolts, auxiliary wheels (73) are fixed on the positioning plates (72), and the auxiliary wheels (73) are higher than the conveying wheels (23).
4. The automatic door plate cutting machine according to claim 1, characterized in that: work platform (3) include first frame (31), set up in first panel (32) on first frame (31) upper end left side and set up in second panel (33) on first frame (31) upper end right side, first panel (32) with the saw bit passageway has between second panel (33), the surface of second panel (33) has a plurality of location pinhole.
5. The automatic door plate cutting machine according to claim 1, characterized in that: the pushing and positioning mechanism (4) comprises two pushing and positioning frames (41) which are symmetrically arranged, a pushing seat (42) which is arranged at the pushing and positioning frame (41) in a sliding mode and a pushing mechanism (43) which is connected with the pushing seat (42).
6. The automatic door plate cutting machine according to claim 5, wherein: the pushing and positioning frame (41) comprises a first supporting column (411) and a second supporting column (412) which are vertically arranged at the upper end of the ground, a first connecting plate (413) arranged at the upper ends of the first supporting column (411) and the second supporting column (412), a first servo motor (414) fixed at the right side end of the first connecting plate (413), two first sliding rails (415) fastened at the first connecting plate (413) through bolts, a first sliding block arranged at the first sliding rails (415) in a sliding mode, a first lead screw (416) connected with the first servo motor (414) through a first coupler, and a first moving seat (417) fastened at the first sliding block through bolts and connected with the first lead screw (416) in a threaded mode; first support column (411) are located the left side of material loading platform (1), second support column (412) are located work platform (3)'s right side, first slide rail (415) are the level setting, first removal seat (417) are L shape structure, a side of first removal seat (417) runs through there is first screw hole, first screw hole with first lead screw (416) suit, first servo motor (414) are used for driving and push away seat (42) and carry out the removal of left right direction.
7. The automatic door plate cutting machine according to claim 5, wherein: the pushing seat (42) comprises a first fixing plate (421), two second sliding rails (422) fastened on the first fixing plate (421) through bolts, a second sliding block arranged on the second sliding rails (422) in a sliding manner, a second servo motor (423) fixed on the rear side end of the first fixing plate (421), and a second lead screw (424) connected with the output shaft end of the second servo motor (423) through a second coupler, the first fixing plate (421) is fixed on the other side edge of the first movable seat (417), a pushing plate (425) is fastened on the right side surface of the second sliding block through a bolt, the pushing plate (425) is vertically arranged, a screw slide seat is projected from the middle part of the left side of the push plate (425), the second screw (424) is screwed with the screw slide seat in a thread way and extends to the front side of the screw slide seat, the second servo motor (423) is used for driving the pushing mechanism (43) to move in the front-back direction.
8. The automatic door plate cutting machine according to claim 5, wherein: the pushing mechanism (43) comprises a Z-axis linear module (431) and a pushing block (432) fixed at the sliding block of the Z-axis linear module (431), the pushing block (432) is of an L-shaped structure, and the Z-axis linear module (431) is used for driving the pushing block (432) to move in the up-and-down direction.
9. The automatic door plate cutting machine according to claim 1 or 4, characterized in that: the cutting mechanism (5) comprises a second lifting mechanism (51), the second lifting mechanism (51) is a hydraulic lifting platform, a mechanical sliding table (52) is fixed at the upper end of the second lifting mechanism, an electric saw (53) is fixed at the upper end of the mechanical sliding table (52), and a saw blade of the electric saw (53) is matched with a saw blade channel;
the second lifting mechanism (51) is arranged inside the first rack (31), the second lifting mechanism (51) is used for driving the mechanical sliding table (52) to ascend or descend, and the mechanical sliding table (52) is used for driving a saw blade of the electric saw to move in the front-back direction.
10. The automatic door plate cutting machine according to claim 1, characterized in that: the discharging platform (6) is three belt conveyors arranged at intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920982941.8U CN210589722U (en) | 2019-06-27 | 2019-06-27 | Automatic material machine of opening of door plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920982941.8U CN210589722U (en) | 2019-06-27 | 2019-06-27 | Automatic material machine of opening of door plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210589722U true CN210589722U (en) | 2020-05-22 |
Family
ID=70717319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920982941.8U Expired - Fee Related CN210589722U (en) | 2019-06-27 | 2019-06-27 | Automatic material machine of opening of door plant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210589722U (en) |
-
2019
- 2019-06-27 CN CN201920982941.8U patent/CN210589722U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200522 |