CN111347578A - Rubber processing temperature control stirring and kneading machine - Google Patents
Rubber processing temperature control stirring and kneading machine Download PDFInfo
- Publication number
- CN111347578A CN111347578A CN202010369064.4A CN202010369064A CN111347578A CN 111347578 A CN111347578 A CN 111347578A CN 202010369064 A CN202010369064 A CN 202010369064A CN 111347578 A CN111347578 A CN 111347578A
- Authority
- CN
- China
- Prior art keywords
- machine body
- kneading
- bearing seat
- kneading roller
- left end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004898 kneading Methods 0.000 title claims abstract description 44
- 238000010057 rubber processing Methods 0.000 title claims abstract description 8
- 238000003756 stirring Methods 0.000 title abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 33
- 239000000110 cooling liquid Substances 0.000 claims abstract description 22
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims abstract description 15
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 9
- 230000000903 blocking effect Effects 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 14
- 230000001681 protective effect Effects 0.000 claims description 10
- 210000000078 claw Anatomy 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 4
- 229920001971 elastomer Polymers 0.000 abstract description 15
- 238000002156 mixing Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 7
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000003786 synthesis reaction Methods 0.000 abstract 1
- 239000002994 raw material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/06—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices
- B29B7/10—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary
- B29B7/12—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type with movable mixing or kneading devices rotary with single shaft
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/80—Component parts, details or accessories; Auxiliary operations
- B29B7/82—Heating or cooling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention belongs to the field of rubber processing mechanical equipment, and particularly relates to a mechanism for adjusting the temperature generated in the processes of stirring, kneading and mixing rubber. In the mechanism, a base plate is used as a whole bearing body, and a motor transmits power to a speed reducer through a bridge type transmission set, wherein the right end of the bridge type transmission set is connected with an auxiliary motor. The left end is connected with a speed reducer, the torque after speed change is transmitted to the kneading roll shaft through a linker for rotary motion, and a cooling cavity is arranged inside the kneading roll shaft. The main machine body is divided into an upper machine shell and a lower machine shell, the upper machine shell and the lower machine shell are combined into the main machine body through bolts, and a cooling cavity is arranged in the main machine body. The upper end of the upper shell is provided with a feed hopper and a discharge regulator. The lower end of the lower shell is provided with a material blocking pile. The right bearing seat is installed at the right end of the main machine body through an inner hexagon bolt, and the left bearing seat is connected with a discharge disc through an inner hexagon bolt and is pressed at the left end of the main machine body. The cooling liquid guider is arranged at the left end of the left bearing seat through an inner hexagon bolt. The guide plate is arranged at the lower end of the left bearing seat. The material cutter is arranged on the left end face of the discharge disc at the rear part of the kneading roller shaft. The machine can realize the kneading, kneading and mixing synthesis of rubber with various components. The mechanical energy realizes the temperature control regulation of rubber under ultra-high temperature in the stirring, kneading and mixing processes.
Description
Technical Field
The invention relates to a rubber processing temperature control, stirring and kneading machine (comprising dry materials and wet materials), in particular to a mechanism for adjusting the temperature generated in the stirring, kneading and mixing of rubber. The rubber raw material deep processing mechanical equipment can be used for stirring, kneading, mixing, controlling temperature and synthesizing rubber raw materials with different components.
Background
The kneading and mixing process, which is a very critical process in the production process of tires and other rubber products, detects and effectively controls the quality of mixed rubber materials in real time and is directly related to the quality of final products of the tires and other rubber products. The development of high-performance tire and green tire technology is greatly improved by relying on deep processing of rubber source materials; however, the traditional primary processing mixing method is difficult to mix, and in order to meet the requirements of green tires and high-end rubber products, the prior method mostly adopts a series dry stirring machine or a wet stirring secondary drying method, so that the equipment investment is very large, the energy consumption is quite high, the discharge temperature is too high to control, the waste gas cannot be collected and treated, the control on the production process is very complicated, and the requirements are very high. In view of the above, the invention provides a continuous production mechanical device for natural rubber/primary processing/deep processing mixing, which can effectively solve the technical difficulty of producing high-quality rubber raw materials and has the advantages of environmental protection, low investment, low operation cost and the like.
Disclosure of Invention
In order to achieve the purpose, the invention provides the following technical scheme: the motor is connected with the bridge type transmission set through a belt, and the auxiliary motor is connected with the right end of the bridge type transmission set through an electromagnetic clutch. The speed reducer input shaft is connected with the left end of the bridge type transmission set through the connector, the protective cover is installed outside the belt, the speed reducer output shaft is connected with the kneading roller shaft through the connector to generate power transmission to achieve rotary motion, and the protective cover is installed outside the connector. The main body is divided into an upper shell and a lower shell which are fixedly connected into a main body through bolts, and the upper end of the upper shell is provided with a feed hopper and a discharge regulator. The right end of the lower shell is provided with a material blocking pile, the right bearing seat is arranged at the right end of the main machine body through an inner hexagon bolt, and the left bearing seat presses the discharge disc at the left end of the main machine body through the inner hexagon bolt. The cooling liquid guider is installed at the left end of the left bearing seat through an inner hexagon bolt, and the guide plate is installed at the lower end of the left bearing seat. The material cutter is arranged on the left end face of the discharge disc at the rear part of the kneading roller shaft.
The main machine body is formed by fixedly connecting an upper machine shell and a lower machine shell through bolts, a curved guide chute is arranged on the inner cavity surface of the main machine body, a cooling cavity is arranged in the main machine body, and cooling liquid enters the cooling cavity from an inlet and flows to an outlet in a circulating manner.
The kneading roller shaft is formed by combining a main shaft, a material grabbing claw, a kneading roller and a material cutting device in an embedded mode into a whole, a cooling cavity is arranged inside the kneading roller, a trapezoidal groove is formed in the outer circle surface, a hard cylindrical grinding head is formed in the groove, a liquid flow channel is arranged inside the main shaft, a cooling liquid flow guider is fixed to the left end face of a left bearing seat through a bolt, cooling liquid flows into the cooling cavity arranged inside the kneading roller from an inlet on the cooling liquid flow guider through the liquid flow channel arranged inside the main shaft, circularly flows into the liquid flow channel arranged inside the main shaft and reaches an outlet of the cooling liquid.
The invention has the beneficial effects that: has the advantages of convenient connection, convenient part replacement, simple and convenient operation, simple processing and structure and easy assembly. The invention adopts the functional advantages and structural characteristics generated by the innovative concept, and effectively solves the technical difficulty of producing high-quality rubber raw materials.
Description of the drawings:
FIG. 1 is a perspective view of the complete machine of the present invention; FIG. 2 is an end view of the host of the present invention; FIG. 3 is a cross-sectional view of the mainframe of the present invention; in the figure, 1, a base plate seat, 2, a main motor, 3, an auxiliary motor, 4, a protective cover, 5, an electromagnetic clutch, 6, a belt protective cover, 7, a bridge transmission group, 8, a coupler, 9, a speed reducer, 10, a protective cover, 11, 12, a right bearing seat, 13, a kneading roller shaft, 14, a feed hopper, 15, an upper shell, 16, a regulator screw rod, 17, a discharge disc, 18, 19, a regulator lock nut, 20, a protective cover, 21, a left bearing seat, 22, a fluid director outlet, 23, 24, a fluid director inlet, 25, 26, a guide plate, 27, 28, 29, 30, a cooling liquid outlet, 31, a lower shell, 32, a cooling liquid inlet, 33, 34, a main machine body, 35, 36, a belt, 37, a cutting blade, 38, a kneading roller, 39, a cooling cavity, 40, a kneading roller grinding head, 41, a guide groove, 42, a material gripping claw, 43, a kneading roller main shaft, 45 main shaft liquid flows out of the channel, and 46 the cooling cavity in the rubbing roller.
The invention will be further described with reference to the following detailed description of the preferred embodiments with reference to the accompanying drawings:
as shown in fig. 1, 2 and 3, a rubber processing kneading mixing temperature control mechanical device has a specific structure; the motor (2) is connected with the bridge type transmission group (7) through a belt (36), and the auxiliary motor (3) is connected with the right end of the bridge type transmission group (7) through an electromagnetic clutch (5). An input shaft of the speed reducer (9) is connected with the left end of the bridge type transmission set (6) through the coupler (8), the protective cover (6) is installed outside the belt (36), an output shaft of the speed reducer (9) is connected through the linker (10) and the kneading roller shaft (13) to generate power transmission to realize rotary motion, and the protective cover (11) is installed outside the linker (10). The main machine body (34) is divided into an upper machine shell (15) and a lower machine shell (31) which are connected through a bolt (29) to form the main machine body (34) which is fixed on the bottom plate (1) through a bolt (28), and the upper end of the upper machine shell (15) is provided with the feed hopper (14) and the discharging regulator (17). The right end of the lower shell (31) is provided with a material blocking pile (33), the right bearing seat (13) is arranged at the right end of the main machine body (34) through an inner hexagon bolt (35), and the left bearing seat (21) presses the discharge disc (18) at the left end of the main machine body (34) through an inner hexagon bolt (27). The cooling liquid guider (22) is arranged at the left end of the bearing seat (21) through an inner hexagon bolt (25), and the guide plate (26) is arranged at the lower end of the left bearing seat (21). The material cutter (36) is arranged on the left end surface of the left discharge disc (18) of the kneading roller shaft (13). The main machine body (34) is fixedly connected with the upper machine shell (15) and the lower machine shell (31) through bolts (29) to form the main machine body (34), a curved guide chute (41) is arranged on the inner cavity surface of the main machine body, a cooling cavity (39) is arranged in the main machine body (34), and cooling liquid enters the cooling cavity (39) from an inlet (32) and circularly flows to an outlet (30). The kneading roller shaft (13) is combined into a whole by a main shaft (43), a material grabbing claw (42), a kneading roller (38) and a material cutting device (36) in an embedding way, a cooling cavity (46) is arranged inside the kneading roller (38), a trapezoidal groove is formed on the outer circle surface of the kneading roller (38), a hard cylindrical grinding head (40) is formed in the groove, a liquid flow channel (44) and a liquid flow channel (45) are arranged inside the main shaft (43), a cooling liquid flow guider (22) is fixed on the left end surface of a left bearing seat (21) through bolts (25), and cooling liquid flows into the cooling cavity (46) arranged inside the kneading roller (38) from an inlet (24) on the cooling liquid flow guider (22) through the liquid flow channel (45) arranged inside the main shaft (43) and circularly flows into the liquid flow channel (44) arranged inside the main shaft (43) to reach.
The principle of the invention is as follows: when the main motor (2) operates, the kneading roller shaft (13) rotates, raw materials enter from the feed hopper (14), the material grabbing claw (42) rotating along with the kneading roller shaft (13) grabs materials to pass through the pile pitch of the material blocking pile (33), the block lump raw materials are torn, pulled and stirred, and the raw materials enter a kneading roller (38) section through the assistance of a material guide groove (41) arranged in the inner cavity of the main machine body (34) to be rolled, extruded, kneaded and mixed in multiple dimensions.
When a high-temperature effect harmful to rubber characteristics occurs in the processing process, the cooling temperature control device is arranged, a cooling cavity (39) is arranged in a main machine body (34), a cooling cavity (46) is arranged in a kneading roller shaft (13), cooling liquid enters the cooling cavity (39) from an inlet (32) of the main machine body (34) after flow regulation, circularly flows to an outlet (30) and is connected to an inlet (24) on a cooling liquid guider (22), flows into the cooling cavity (46) arranged in the kneading roller (38) through a liquid flow channel (45) arranged in a main shaft (43) and circularly flows into a liquid flow channel (44) arranged in the main shaft (43) to reach an outlet (23) of the cooling liquid guider (22), and elimination and regulation of the high-temperature effect harmful to the rubber characteristics are realized.
After the materials are processed to meet the requirements, the materials are discharged out of the machine body from a material guide groove (41) arranged in the main machine body (34) through a material discharge hole on the material discharge disc (18), and the materials are separated by tangential rotation of the blade surface of a material cutting sheet (37) embedded on a material cutter (47) coaxial with the kneading roller (13) and the end surface of the material discharge disc (18).
While the invention has been described in terms of its preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (3)
1. A rubber processing machine, which is characterized in that; comprises a bottom plate seat (1), a motor (2) is connected with a bridge type transmission group (7) through a belt (36), an auxiliary motor (3) is connected with the right end of the bridge type transmission group (7) through an electromagnetic clutch (5), an input shaft of a speed reducer (9) is connected with the left end of the bridge type transmission group (7) through a coupler (8), a protective cover (6) is installed outside the belt (36), an output shaft of the speed reducer (9) is connected with a kneading roller shaft (13) through a linker (10) to generate power transmission to realize rotary motion, the outside of the linker (10) is provided with the protective cover (11), a host machine body (34) is divided into an upper machine shell (15) and a lower machine shell (31) which are connected into the host machine body (34) through bolts (29), a feed hopper (14) is installed at the upper end of the upper machine shell (15), a material blocking pile (33) is installed at the right end of the lower machine shell (31) of a discharge regulator (17), a right bearing seat (, the left bearing seat (21) presses the discharge disc (18) at the left end of the main machine body (34) through an inner hexagon bolt (27), the cooling liquid guider (22) is installed at the left end of the left bearing seat (21) through an inner hexagon bolt (25), the material guide plate (26) is installed at the lower end of the left bearing seat (21), and the material cutter (36) is installed at the left end surface of the discharge disc (18) at the left part of the kneading roller shaft (13).
2. A rubber processing machine as claimed in claim 1, wherein; the main machine body (34) is formed by connecting an upper machine shell (15) and a lower machine shell (31) through bolts (29) to form the main machine body (34), a curved guide chute (41) is arranged on the inner cavity surface of the main machine body, a cooling cavity (39) is arranged in the main machine body (34), and cooling liquid enters the cooling cavity (39) from an inlet (32) and circularly flows to an outlet (30).
3. A rubber processing machine as claimed in claim 1, wherein; the kneading roller shaft (13) is combined into a whole by a main shaft (43), a material grabbing claw (42), a kneading roller (38) and a material cutting device (36) in an embedding way, a cooling cavity (46) is arranged inside the kneading roller (38), a trapezoidal groove is formed on the outer circle surface of the kneading roller (38), a hard cylindrical grinding head (40) is formed in the groove, a liquid flow channel (44) and a liquid flow channel (45) are arranged inside the main shaft (43), a cooling liquid flow guider (22) is fixed on the left end surface of a left bearing seat (21) through bolts (25), and cooling liquid flows into the cooling cavity (46) arranged inside the kneading roller (38) from an inlet (24) on the cooling liquid flow guider (22) through the liquid flow channel (45) arranged inside the main shaft (43) and circularly flows into the liquid flow channel (44) arranged inside the main shaft (43) to reach.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010369064.4A CN111347578A (en) | 2020-05-04 | 2020-05-04 | Rubber processing temperature control stirring and kneading machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010369064.4A CN111347578A (en) | 2020-05-04 | 2020-05-04 | Rubber processing temperature control stirring and kneading machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111347578A true CN111347578A (en) | 2020-06-30 |
Family
ID=71189921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010369064.4A Pending CN111347578A (en) | 2020-05-04 | 2020-05-04 | Rubber processing temperature control stirring and kneading machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111347578A (en) |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1264852A (en) * | 1969-04-15 | 1972-02-23 | ||
| JP2004230591A (en) * | 2003-01-28 | 2004-08-19 | Yokohama Rubber Co Ltd:The | Cooling device of pin type kneading continuous extruder |
| CN201708637U (en) * | 2010-04-02 | 2011-01-12 | 马成习 | Driving device of oil pumping unit |
| CN102022678A (en) * | 2010-11-18 | 2011-04-20 | 朱大龙 | LED road lamp capable of dissipating heat by coolant liquid in sleeve of lamp pole pipe |
| CN202669483U (en) * | 2012-06-05 | 2013-01-16 | 范兆军 | Dual-motor differential rear axle |
| CN203076517U (en) * | 2012-12-21 | 2013-07-24 | 苏州工业园区久禾工业炉有限公司 | Driving and transmitting device |
| WO2013115371A1 (en) * | 2012-02-03 | 2013-08-08 | 三菱重工マシナリーテクノロジー株式会社 | Kneading rotor and kneader |
| CN204431544U (en) * | 2014-12-31 | 2015-07-01 | 马弗橡塑（镇江）有限公司 | A kind of cooling device produced for elastomeric compound |
| CN205523762U (en) * | 2016-04-14 | 2016-08-31 | 吉林大学 | Bi -motor electric automobile power assembly |
| CN205552925U (en) * | 2016-04-07 | 2016-09-07 | 海南精翊机电设备有限公司 | Novel stir machine futilely |
| CN205552948U (en) * | 2016-04-07 | 2016-09-07 | 海南精翊机电设备有限公司 | Novel soft machine of single roller extrusion |
| KR101680003B1 (en) * | 2016-01-26 | 2016-11-25 | (주)한도기공 | Automatic mixing roll for rubber mixing with symmetrical combination structure of extruding die and extruding screw |
| US20170304841A1 (en) * | 2014-10-24 | 2017-10-26 | Korea Institute Of Industrial Technology | Hydrate production apparatus and water treatment apparatus using same |
| CN209580155U (en) * | 2018-12-09 | 2019-11-05 | 西双版纳绿恒橡胶机械设备有限公司 | A kind of natural rubber preliminary working is wet to stir to squeeze and washes all-in-one machine |
| CN209812851U (en) * | 2019-03-29 | 2019-12-20 | 南京金腾橡塑有限公司 | Rubber refining roller |
| CN110774473A (en) * | 2019-11-29 | 2020-02-11 | 山东东盛橡胶科技股份有限公司 | Plasticized rubber powder forced mixer |
-
2020
- 2020-05-04 CN CN202010369064.4A patent/CN111347578A/en active Pending
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1264852A (en) * | 1969-04-15 | 1972-02-23 | ||
| JP2004230591A (en) * | 2003-01-28 | 2004-08-19 | Yokohama Rubber Co Ltd:The | Cooling device of pin type kneading continuous extruder |
| CN201708637U (en) * | 2010-04-02 | 2011-01-12 | 马成习 | Driving device of oil pumping unit |
| CN102022678A (en) * | 2010-11-18 | 2011-04-20 | 朱大龙 | LED road lamp capable of dissipating heat by coolant liquid in sleeve of lamp pole pipe |
| WO2013115371A1 (en) * | 2012-02-03 | 2013-08-08 | 三菱重工マシナリーテクノロジー株式会社 | Kneading rotor and kneader |
| JP2013159012A (en) * | 2012-02-03 | 2013-08-19 | Mitsubishi Heavy Industries Machinery Technology Corp | Kneading rotor and kneader |
| CN202669483U (en) * | 2012-06-05 | 2013-01-16 | 范兆军 | Dual-motor differential rear axle |
| CN203076517U (en) * | 2012-12-21 | 2013-07-24 | 苏州工业园区久禾工业炉有限公司 | Driving and transmitting device |
| US20170304841A1 (en) * | 2014-10-24 | 2017-10-26 | Korea Institute Of Industrial Technology | Hydrate production apparatus and water treatment apparatus using same |
| CN204431544U (en) * | 2014-12-31 | 2015-07-01 | 马弗橡塑（镇江）有限公司 | A kind of cooling device produced for elastomeric compound |
| KR101680003B1 (en) * | 2016-01-26 | 2016-11-25 | (주)한도기공 | Automatic mixing roll for rubber mixing with symmetrical combination structure of extruding die and extruding screw |
| CN205552925U (en) * | 2016-04-07 | 2016-09-07 | 海南精翊机电设备有限公司 | Novel stir machine futilely |
| CN205552948U (en) * | 2016-04-07 | 2016-09-07 | 海南精翊机电设备有限公司 | Novel soft machine of single roller extrusion |
| CN205523762U (en) * | 2016-04-14 | 2016-08-31 | 吉林大学 | Bi -motor electric automobile power assembly |
| CN209580155U (en) * | 2018-12-09 | 2019-11-05 | 西双版纳绿恒橡胶机械设备有限公司 | A kind of natural rubber preliminary working is wet to stir to squeeze and washes all-in-one machine |
| CN209812851U (en) * | 2019-03-29 | 2019-12-20 | 南京金腾橡塑有限公司 | Rubber refining roller |
| CN110774473A (en) * | 2019-11-29 | 2020-02-11 | 山东东盛橡胶科技股份有限公司 | Plasticized rubber powder forced mixer |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication | ||
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Application publication date: 20200630 |