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CN112555509A - Novel heat supply engineering heating pipeline fixed bolster - Google Patents

Novel heat supply engineering heating pipeline fixed bolster Download PDF

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Publication number
CN112555509A
CN112555509A CN202011577316.9A CN202011577316A CN112555509A CN 112555509 A CN112555509 A CN 112555509A CN 202011577316 A CN202011577316 A CN 202011577316A CN 112555509 A CN112555509 A CN 112555509A
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CN
China
Prior art keywords
heat supply
limiting
plate
supporting
rod
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN202011577316.9A
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Chinese (zh)
Inventor
韩志超
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN202011577316.9A priority Critical patent/CN112555509A/en
Publication of CN112555509A publication Critical patent/CN112555509A/en
Withdrawn legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L3/00Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
    • F16L3/08Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets substantially surrounding the pipe, cable or protective tubing
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L3/00Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
    • F16L3/16Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets with special provision allowing movement of the pipe
    • F16L3/20Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets with special provision allowing movement of the pipe allowing movement in transverse direction

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Housings, Intake/Discharge, And Installation Of Fluid Heaters (AREA)

Abstract

The invention discloses a novel heat supply engineering heat supply pipeline fixing support which comprises a fixing base, wherein a supporting rod is fixedly connected to the fixing base, a supporting component is arranged at the top end of the supporting rod, a lifting component is arranged on one side of the supporting rod, and the lifting component is connected with a driving component through a rotating component; the supporting component comprises a supporting plate, the upper end of the supporting plate is an arc surface, a plurality of ball grooves are formed in the end face of the supporting plate at equal intervals along the circumferential direction of the supporting plate, the ball grooves are in the shape of necking round grooves, movable balls are embedded in the ball grooves, and the upper end faces of the movable balls are higher than the top ends of the ball grooves. The support plate can support the heat supply pipeline, and the design of the movable balls arranged on the support plate reduces the frictional resistance between the support plate and the outer side wall of the heat supply pipeline, so that the heat supply pipeline can be conveniently connected in a transverse translation or rotary threaded mode.

Description

Novel heat supply engineering heating pipeline fixed bolster
Technical Field
The invention relates to the field of heat supply engineering construction, in particular to a novel heat supply pipeline fixing support for heat supply engineering.
Background
In the northern area of China, the temperature can reach a very low degree in winter, each household needs to be heated, and a heating pipeline needs to be used in the heating process to distribute the heating for each household.
Carry out the in-process that the heating installation distributes at the heat supply pipeline and need use a heat supply pipeline fixed bolster to support the heat supply pipeline, need carry out position adjustment or threaded connection because adjacent heat supply pipeline when installing, and fixed bolster among the prior art can lead to the fact certain hindrance to the position adjustment and the swivelling joint of heat supply pipeline, simultaneously because heat supply pipeline is bulky, carry out the removal of heat supply pipeline through the manpower, swivelling joint then wastes time and energy, the assembly efficiency of heat supply pipeline has seriously been influenced, the construction operation for heat supply engineering brings certain puzzlement.
Disclosure of Invention
The invention aims to solve the problems and provides a novel heat supply engineering heat supply pipeline fixing support which is simple in structure and convenient to use.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a novel heat supply engineering heat supply pipeline fixing support comprises a fixing base, wherein a supporting rod is fixedly connected to the fixing base, a supporting assembly is arranged at the top end of the supporting rod, a lifting assembly is arranged on one side of the supporting rod, and the lifting assembly is connected with a driving assembly through a rotating assembly; the supporting component comprises a supporting plate, the upper end of the supporting plate is an arc surface, a plurality of ball grooves are formed in the end face of the supporting plate at equal intervals along the circumferential direction of the supporting plate, the ball grooves are in the shape of necking round grooves, movable balls are embedded in the ball grooves, and the upper end faces of the movable balls are higher than the top ends of the ball grooves.
Furthermore, the lifting assembly comprises an electric push rod and a lifting rod, a sliding groove is formed in one side of the supporting rod along the height direction of the supporting rod, and a limiting groove is formed in the inner side wall of the sliding groove; one end of the lifting rod is embedded in the sliding groove, and the lifting rod can slide relative to the sliding groove; a limit bulge matched with the limit groove is arranged on the side wall of one end of the lifting rod, which is embedded in the sliding groove; when the lifting rod is connected with the sliding groove in a sliding manner, the limiting protrusion is embedded in the limiting groove and can slide longitudinally relative to the limiting groove; one end of the lifting rod, which is far away from the supporting rod, is connected with the rotating assembly; the bottom end of the electric push rod is fixedly connected to the upper end of the fixed base, and the end head of the electric push rod is fixedly connected with the bottom end of the lifting rod.
Furthermore, the rotating assembly comprises an installation column, and the bottom end of the installation column is rotatably connected with one end, far away from the support rod, of the lifting rod; a first limiting plate and a second limiting plate are fixedly connected to the outer side of the mounting column, the first limiting plate is perpendicular to the second limiting plate, first mounting screw holes are formed in the first limiting plate and the second limiting plate, a third limiting plate is arranged on the upper end face of the lifting rod, a second mounting screw hole is formed in the third limiting plate, and the second mounting screw hole is connected with any one first mounting screw hole through a fixing bolt; the top end of the mounting column is connected with a driving assembly.
Furthermore, the driving assembly comprises a first mounting plate and a second mounting plate, the first mounting plate and the second mounting plate are vertically arranged, and the bottom ends of the first mounting plate and the second mounting plate are fixedly connected with the top end of the mounting column; two rotating rollers arranged side by side are arranged between the first mounting plate and the second mounting plate, and two ends of each rotating roller are respectively rotatably connected with the first mounting plate and the second mounting plate; the first mounting panel outside fixedly connected with power motor, power motor and one of them rotatory running roller transmission are connected, connect through belt transmission between two rotatory running rollers.
Further, rotatory running roller includes fixed axle, fixed cover, and the both ends of fixed axle respectively with first mounting panel, second mounting panel rotatable coupling, fixed cover cup joints outside the fixed axle and fixed cover is connected through flexible subassembly between the axle.
Furthermore, the telescopic assembly comprises a plurality of guide pipes, guide columns and telescopic springs, the guide pipes are arranged along the circumferential direction of the fixed shaft, one ends of the guide pipes are fixedly connected with the outer side surface of the fixed shaft, the other ends of the guide pipes are sleeved on the outer side of one ends of the guide columns, the guide columns can slide relative to the guide pipes, and the other ends of the guide columns are fixedly connected with the inner side surface of the fixed sleeve; the guide tube is internally provided with an expansion spring, one end of the expansion spring is contacted with the outer side surface of the fixed shaft, and the other end of the expansion spring is contacted with the end head of the guide post sleeved in the guide tube.
Furthermore, be provided with spacing through-hole along the axis direction of stand pipe on the stand pipe lateral wall, the outside fixedly connected with gag lever post of guide post, when the stand pipe cup joints in the stand pipe, the gag lever post is worn out and the gag lever post can slide along the length direction of spacing through-hole in the spacing through-hole.
Further, the outer side of the fixing sleeve is provided with a rubber coating or the fixing sleeve is made of rubber.
Compared with the prior art, the invention has the advantages and positive effects that:
according to the invention, the design that the supporting component is arranged on the supporting rod is adopted, so that the supporting plate in the supporting component can support the heat supply pipeline, and meanwhile, the design that the movable balls are arranged on the supporting plate reduces the frictional resistance between the supporting plate and the outer side wall of the heat supply pipeline, so that the heat supply pipeline can be conveniently subjected to operation of transverse translation or rotary threaded connection.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of the present invention for driving a heat supply pipeline to rotate;
FIG. 2 is a schematic diagram of the present invention for driving the heat supply pipeline to move transversely;
FIG. 3 is a top view of the support plate;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
FIG. 5 is a schematic view of the lifting assembly;
FIG. 6 is a schematic structural diagram of a driving assembly;
FIG. 7 is a schematic structural view of a rotary roller;
fig. 8 is an enlarged view of a portion of the structure of fig. 7.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived from the embodiments of the present invention by a person skilled in the art without any creative effort, should be included in the protection scope of the present invention.
As shown in fig. 1 to 8, the embodiment discloses a novel heat supply pipeline fixing bracket for heat supply engineering, which includes a fixing base 1, a supporting rod 2 is fixedly connected to the fixing base 1, a supporting component is arranged at the top end of the supporting rod 2, a lifting component is arranged at one side of the supporting rod 2, and the lifting component is connected with a driving component through a rotating component; the supporting component comprises a supporting plate 3, the upper end of the supporting plate 3 is an arc surface, a plurality of ball grooves 301 are formed in the end face of the supporting plate 3 at equal intervals along the circumferential direction of the supporting plate 3, the ball grooves 301 are necking ball groove-shaped, movable balls 9 are embedded in the ball grooves 3, and the heights of the upper end faces of the movable balls 9 are higher than the top heights of the ball grooves 301.
According to the invention, through the design of arranging the supporting component on the supporting rod, the supporting plate 3 in the supporting component can support the heat supply pipeline 10, and meanwhile, the design of arranging the movable balls 9 on the supporting plate 3 reduces the frictional resistance between the supporting plate 3 and the outer side wall of the heat supply pipeline 10, so that the heat supply pipeline 10 can be conveniently subjected to operation of transverse translation or rotary threaded connection.
The lifting assembly comprises an electric push rod 5 and a lifting rod 4, a sliding groove 201 is formed in one side of the supporting rod 2 along the height direction of the supporting rod 2, and a limiting groove is formed in the inner side wall of the sliding groove 201; one end of the lifting rod 4 is embedded in the sliding groove 201, and the lifting rod 4 can slide relative to the sliding groove 201; a limiting bulge 402 matched with the limiting groove is arranged on the side wall of one end, embedded in the sliding groove 201, of the lifting rod 4; when the lifting rod 4 is connected with the sliding groove 201 in a sliding manner, the limiting protrusion 402 is embedded in the limiting groove, and the limiting protrusion 402 can slide longitudinally relative to the limiting groove; one end of the lifting rod 4, which is far away from the supporting rod 2, is connected with the rotating assembly; the bottom end of the electric push rod 5 is fixedly connected to the upper end of the fixed base 1, and the end of the push rod of the electric push rod 5 is fixedly connected with the bottom end of the lifting rod 4.
When the lifting operation is carried out, only the working state of the electric push rod is required to be controlled, the electric push rod pushes the lifting rod to ascend along the sliding groove when being stretched, and the electric push rod drives the lifting rod to descend along the sliding groove when being contracted.
The rotating assembly comprises an installation column 6, and the bottom end of the installation column 6 is rotatably connected with one end of the lifting rod 4 far away from the support rod 2; a first limiting plate 601 and a second limiting plate 602 are fixedly connected to the outer side of the mounting column 6, the first limiting plate 601 is perpendicular to the second limiting plate 602, first mounting screw holes are formed in the first limiting plate 601 and the second limiting plate 602 respectively, a third limiting plate 401 is arranged on the upper end surface of the lifting rod 4, a second mounting screw hole is formed in the third limiting plate 401, and the second mounting screw hole is connected with any one first mounting screw hole through a fixing bolt; the top end of the mounting column 6 is connected with a driving component.
The driving assembly comprises a first mounting plate 11 and a second mounting plate 12, the first mounting plate 11 and the second mounting plate 12 are vertically arranged, and the bottom ends of the first mounting plate 11 and the second mounting plate 12 are fixedly connected with the top end of the mounting column; two rotating rollers 7 arranged side by side are arranged between the first mounting plate 11 and the second mounting plate 12, and two ends of each rotating roller 7 are rotatably connected with the first mounting plate 11 and the second mounting plate 12 respectively; the first mounting panel 11 outside fixedly connected with power motor 13, power motor 13 is connected with one of them rotatory running roller 7 transmission, connect through belt transmission between two rotatory running rollers 7.
When the second mounting screw hole is connected with different first mounting screw holes, the mounting columns are in different states, when two adjacent heat supply pipelines need to be in threaded connection, the driving assembly needs to rotate the heat supply pipelines, the mounting columns are rotated, the axes of rotating rollers in the driving assembly are overlapped with the axes of the heat supply pipelines, at the moment, the mounting columns are in the first states, and the first limiting plate is in bolted connection with the third limiting plate; the two rotating rollers are contacted with the end wall of the bottom end of the heat supply pipeline through the ascending operation of the lifting assembly, and the two rotating rollers are controlled to rotate through the power motor, so that the heat supply pipeline is driven to rotate on the movable ball through friction force, and the threaded connection between the two heat supply pipelines is realized;
when the distance between the two heat supply pipelines is large and one of the heat supply pipelines needs to be transversely moved, the driving assembly needs to transversely move the heat supply pipelines, the mounting column is rotated, the axis of the rotating roller in the driving assembly is perpendicular to the axis of the heat supply pipeline, and the mounting column is in a second state, and the second limiting plate is in bolted connection with the third limiting plate; the two rotating rollers are contacted with the end wall of the bottom end of the heat supply pipeline through the ascending operation of the lifting assembly, and the two rotating rollers are controlled to rotate through the power motor, so that the heat supply pipeline is driven to transversely move on the movable ball through friction force, and the moving and approaching operation between the two heat supply pipelines is realized;
the rotating roller 7 comprises a fixed shaft 701 and a fixed sleeve 702, two ends of the fixed shaft 701 are rotatably connected with the first mounting plate 11 and the second mounting plate 12 respectively, the fixed sleeve 702 is sleeved on the outer side of the fixed shaft 701, and the fixed sleeve 702 is connected with the fixed shaft 701 through a telescopic assembly 8.
The telescopic assembly 8 comprises a plurality of guide pipes 801, guide posts 802 and telescopic springs 803, wherein the guide pipes 801 are arranged along the circumferential direction of the fixing shaft 701, one end of each guide pipe 801 is fixedly connected with the outer side face of the fixing shaft 701, the other end of each guide pipe 801 is sleeved on the outer side of one end of each guide post 802, the guide posts 802 can slide relative to the guide pipes 801, and the other end of each guide post 802 is fixedly connected with the inner side face of the fixing sleeve 702; an extension spring 803 is arranged in the guide pipe 801, one end of the extension spring 803 is in contact with the outer side face of the fixed shaft 701, and the other end of the extension spring 803 is in contact with the end of the guide column 802 sleeved in the guide pipe 801.
The design of the telescopic assembly can enable the fixed sleeve to have a certain elastic telescopic amount relative to the fixed shaft, and when the lifting assembly rises, the two rotary rollers can be ensured to be in contact with the outer side wall of the heat supply pipeline, so that the situation that the lifting assembly cannot move upwards continuously due to the fact that the fixed sleeve of one rotary roller is in contact with the outer side wall of the heat supply pipeline, the other rotary roller cannot be in contact with the heat supply pipeline, the driving effect is influenced is avoided, and the using effect of the invention is further improved.
The outer side wall of the guide pipe 801 is provided with a limiting through hole 805 along the axial direction of the guide pipe 801, the outer side of the guide column 802 is fixedly connected with a limiting rod 804, when the guide column 802 is sleeved in the guide pipe 801, the limiting rod 804 penetrates out of the limiting through hole 805, and the limiting rod 804 can slide along the length direction of the limiting through hole 805. The design of combining the limiting rod with the limiting through hole can avoid the situation that the guide post is separated from the guide pipe, and improves the use effect of the invention.
The harness 702 is made of rubber. The rubber can enhance the friction between the fixing sleeve 702 and the heat supply pipeline 10, thereby conveniently realizing the driving effect on the heat supply pipeline 10.

Claims (8)

1. The utility model provides a novel heat supply engineering heating pipeline fixed bolster, includes unable adjustment base, the last fixedly connected with bracing piece of unable adjustment base, its characterized in that: the top end of the supporting rod is provided with a supporting component, one side of the supporting rod is provided with a lifting component, and the lifting component is connected with the driving component through a rotating component; the supporting component comprises a supporting plate, the upper end of the supporting plate is an arc surface, a plurality of ball grooves are formed in the end face of the supporting plate at equal intervals along the circumferential direction of the supporting plate, the ball grooves are in the shape of necking round grooves, movable balls are embedded in the ball grooves, and the upper end faces of the movable balls are higher than the top ends of the ball grooves.
2. A novel heat supply engineering heat supply pipeline fixing bracket as claimed in claim 1, characterized in that: the lifting assembly comprises an electric push rod and a lifting rod, a sliding groove is formed in one side of the supporting rod along the height direction of the supporting rod, and a limiting groove is formed in the inner side wall of the sliding groove; one end of the lifting rod is embedded in the sliding groove, and the lifting rod can slide relative to the sliding groove; a limit bulge matched with the limit groove is arranged on the side wall of one end of the lifting rod, which is embedded in the sliding groove; when the lifting rod is connected with the sliding groove in a sliding manner, the limiting protrusion is embedded in the limiting groove and can slide longitudinally relative to the limiting groove; one end of the lifting rod, which is far away from the supporting rod, is connected with the rotating assembly; the bottom end of the electric push rod is fixedly connected to the upper end of the fixed base, and the end head of the electric push rod is fixedly connected with the bottom end of the lifting rod.
3. A novel heat supply engineering heat supply pipeline fixing bracket as claimed in claim 2, characterized in that: the rotating assembly comprises an installation column, and the bottom end of the installation column is rotatably connected with one end of the lifting rod, which is far away from the supporting rod; a first limiting plate and a second limiting plate are fixedly connected to the outer side of the mounting column, the first limiting plate is perpendicular to the second limiting plate, first mounting screw holes are formed in the first limiting plate and the second limiting plate, a third limiting plate is arranged on the upper end face of the lifting rod, a second mounting screw hole is formed in the third limiting plate, and the second mounting screw hole is connected with any one first mounting screw hole through a fixing bolt; the top end of the mounting column is connected with a driving assembly.
4. A novel heat supply engineering heat supply pipeline fixing bracket as claimed in claim 3, characterized in that: the driving assembly comprises a first mounting plate and a second mounting plate, the first mounting plate and the second mounting plate are vertically arranged, and the bottom ends of the first mounting plate and the second mounting plate are fixedly connected with the top end of the mounting column; two rotating rollers arranged side by side are arranged between the first mounting plate and the second mounting plate, and two ends of each rotating roller are respectively rotatably connected with the first mounting plate and the second mounting plate; the first mounting panel outside fixedly connected with power motor, power motor and one of them rotatory running roller transmission are connected, connect through belt transmission between two rotatory running rollers.
5. The new heat supply engineering heat supply pipeline fixing bracket of claim 4, characterized in that: the rotary roller comprises a fixed shaft and a fixed sleeve, the two ends of the fixed shaft are respectively rotatably connected with the first mounting plate and the second mounting plate, and the fixed sleeve is sleeved outside the fixed shaft and is connected with the fixed shaft through a telescopic assembly.
6. The new heat supply engineering heat supply pipeline fixing bracket of claim 5, characterized in that: the telescopic assembly comprises a plurality of guide pipes, guide columns and telescopic springs, the guide pipes are arranged along the circumferential direction of the fixed shaft, one ends of the guide pipes are fixedly connected with the outer side surface of the fixed shaft, the other ends of the guide pipes are sleeved on the outer side of one ends of the guide columns, the guide columns can slide relative to the guide pipes, and the other ends of the guide columns are fixedly connected with the inner side surface of the fixed sleeve; the guide tube is internally provided with an expansion spring, one end of the expansion spring is contacted with the outer side surface of the fixed shaft, and the other end of the expansion spring is contacted with the end head of the guide post sleeved in the guide tube.
7. The construction cost on-site surveying and mapping apparatus of claim 6, wherein: the guide tube is characterized in that a limiting through hole is formed in the outer side wall of the guide tube along the axis direction of the guide tube, a limiting rod is fixedly connected to the outer side of the guide column, and when the guide column is sleeved in the guide tube, the limiting rod penetrates out of the limiting through hole and can slide along the length direction of the limiting through hole.
8. The construction cost on-site surveying and mapping apparatus of claim 7, wherein: the outer side of the fixing sleeve is provided with a rubber coating or the fixing sleeve is made of rubber.
CN202011577316.9A 2020-12-28 2020-12-28 Novel heat supply engineering heating pipeline fixed bolster Withdrawn CN112555509A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011577316.9A CN112555509A (en) 2020-12-28 2020-12-28 Novel heat supply engineering heating pipeline fixed bolster

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011577316.9A CN112555509A (en) 2020-12-28 2020-12-28 Novel heat supply engineering heating pipeline fixed bolster

Publications (1)

Publication Number Publication Date
CN112555509A true CN112555509A (en) 2021-03-26

Family

ID=75033768

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011577316.9A Withdrawn CN112555509A (en) 2020-12-28 2020-12-28 Novel heat supply engineering heating pipeline fixed bolster

Country Status (1)

Country Link
CN (1) CN112555509A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113123787A (en) * 2021-05-25 2021-07-16 天地科技股份有限公司 Rapid roadway tunneling system
CN113216953A (en) * 2021-05-25 2021-08-06 天地科技股份有限公司 Rapid tunneling method for transportation roadway

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113123787A (en) * 2021-05-25 2021-07-16 天地科技股份有限公司 Rapid roadway tunneling system
CN113216953A (en) * 2021-05-25 2021-08-06 天地科技股份有限公司 Rapid tunneling method for transportation roadway
CN113216953B (en) * 2021-05-25 2023-11-17 天地科技股份有限公司 Quick tunneling method for transportation tunnel
CN113123787B (en) * 2021-05-25 2023-11-21 天地科技股份有限公司 Roadway rapid tunneling system

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Application publication date: 20210326