CN112496108A - Quick bent pipe generator - Google Patents

Quick bent pipe generator Download PDF

Info

Publication number
CN112496108A
CN112496108A CN202011171079.6A CN202011171079A CN112496108A CN 112496108 A CN112496108 A CN 112496108A CN 202011171079 A CN202011171079 A CN 202011171079A CN 112496108 A CN112496108 A CN 112496108A
Authority
CN
China
Prior art keywords
wheel
forming
positioning
forming wheel
bent
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Withdrawn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
CN202011171079.6A
Other languages
Chinese (zh)
Inventor
卓本育
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.)
Luoyuan Country Zhongfang Town People's Government
Original Assignee
Luoyuan Country Zhongfang Town People's Government
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Luoyuan Country Zhongfang Town People's Government filed Critical Luoyuan Country Zhongfang Town People's Government
Priority to CN202011171079.6A priority Critical patent/CN112496108A/en
Publication of CN112496108A publication Critical patent/CN112496108A/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00Bending rods, profiles, or tubes
    • B21D7/06Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/003Positioning devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/006Feeding elongated articles, such as tubes, bars, or profiles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02Advancing work in relation to the stroke of the die or tool
    • B21D43/04Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/08Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work by rollers

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

The invention discloses a quick bent pipe generator which comprises a base, wherein four groups of working wheels with installation shafts vertical to the arrangement direction are linearly arranged on the base through four groups of supports, the four groups of working wheels sequentially comprise a first positioning wheel, a first forming wheel, a second forming wheel and a second positioning wheel along the arrangement direction, two ends of the installation shaft of the second forming wheel are also hinged with a U-shaped rotating arm, a bending wheel parallel to the second forming wheel is installed on the U-shaped rotating arm, annular arc grooves are formed in the peripheral walls of the first positioning wheel, the first forming wheel, the second positioning wheel and the bending wheel, and when the generator works, a steel pipe to be bent horizontally penetrates through the lower part of the first positioning wheel, the upper part of the first forming wheel, the upper part of the second forming wheel and the gap between the upper part of the second forming wheel and the bending wheel and the lower part of the second positioning wheel. The invention has simple structure and convenient operation, and in the process of downward pressing and forming, the steel pipe is not easy to be flattened and damaged due to larger force, the forming rate of the bent pipe is high, and the quality of the formed bent pipe is good.

Description

Quick bent pipe generator
Technical Field
The invention relates to the field of machining, in particular to a quick bent pipe generator.
Background
In the construction of water heating pipe engineering, when two pipes are crossed, an arc pipe fitting for connection, i.e. a bent pipe connector (holding bender), is often used to make one pipe cross the other pipe. The existing steel pipe elbow (holding bender) is mostly made by adopting a vertically arranged cylinder and bending and detaching a straight steel pipe along the vertically arranged cylinder.
Disclosure of Invention
The invention aims to provide a bent pipe rapid generator.
The technical scheme for realizing the purpose of the invention is as follows: a quick bent pipe generator comprises a base, wherein four groups of working wheels with installation shafts vertical to the arrangement direction are linearly arranged on the base through four groups of supports, the four groups of working wheels are sequentially provided with a first positioning wheel, a first forming wheel, a second forming wheel and a second positioning wheel along the arrangement direction, the first positioning wheel and the installation support for installing the first positioning wheel are detachably installed, the diameters of the first positioning wheel and the second positioning wheel are consistent, the installation heights of the first forming wheel and the second forming wheel are the same, the installation height of the first forming wheel is lower than that of the first positioning wheel, two ends of the installation shaft of the second forming wheel are also hinged with a U-shaped rotating arm, a bending wheel parallel to the second forming wheel is installed on the U-shaped rotating arm, and circular arc grooves are formed in the peripheral walls of the first positioning wheel, the first forming wheel, the second positioning wheel and the bending wheel, the vertical spacing of the annular arc groove on the first forming wheel and the annular arc groove on the first positioning wheel, the spacing of the annular arc groove on the second forming wheel and the annular arc groove on the bending wheel are not smaller than the diameter of the steel pipe to be bent, the horizontal spacing of the first forming wheel and the second forming wheel is smaller than the diameter of the bending wheel, and during operation, the steel pipe to be bent is horizontally penetrated through the lower part of the first positioning wheel, the upper part of the first forming wheel, the upper part of the second forming wheel and the gap of the bending wheel and the lower part of the second positioning wheel.
Furthermore, a sliding groove is formed in the base, the lower end of the mounting bracket provided with the first forming wheel is inserted into the sliding groove in the base, a screw horizontally penetrates through the two groups of mounting brackets respectively provided with the first forming wheel of the second forming wheel, a first locking nut and a second locking nut are sleeved on the screw, and the first locking nut and the second locking nut are respectively positioned on two sides of the mounting bracket provided with the first forming wheel and are axially contacted and locked with the mounting bracket. Under this setting, the installing support of installing first forming wheel can remove for the spout on the base to realize the adjustment of first forming wheel and second forming wheel interval, with the preparation of the return bend of adaptation different degree of depth, different arc length, when adjusting the position of first forming wheel, only need cooperate first lock nut and second lock nut's regulation can.
Further, a handle is arranged at the free end of the U-shaped rotating arm. The arrangement of the handle facilitates the operation of pressing the bent pipe by the bending wheel.
Further, the bottom of base is installed and is removed the wheel. The moving wheel is arranged, so that the forming device can move conveniently.
The quick bent pipe generator has a simple structure and is convenient to operate, after a steel pipe to be bent horizontally penetrates through the lower part of the first positioning wheel, the upper part of the first forming wheel, the gap between the upper part of the second forming wheel and the bending wheel and the lower part of the second positioning wheel, the steel pipe only needs to be pressed and formed by the bending wheel, in the pressing and forming process, the steel pipe is subjected to larger force, but annular arc grooves are arranged on the peripheral walls of the wheels, particularly the first forming wheel, the second forming wheel and the bending wheel, when in processing, the steel pipe is positioned in the annular arc grooves of the wheels, the annular arc grooves limit the steel pipe, the contact surface and the acting surface of the annular arc grooves and the steel pipe are large, the steel pipe is not easy to be damaged due to the larger force, the bending pipe forming rate is high, and the wheels comprise the first positioning wheel, the first forming wheel, the second positioning wheel and the bending wheel, in the processing process, the friction force between the steel pipe and the steel pipe is small, the surface of the steel pipe cannot be scratched, and the quality of the formed bent pipe is good.
Drawings
Fig. 1 is a schematic perspective view of an unmolded bent pipe when the bent pipe rapid generator of the present invention is in operation;
FIG. 2 is a schematic diagram of the front view structure of the elbow pipe before the elbow pipe is formed when the quick elbow pipe generator of the present invention operates
FIG. 3 is a schematic side view of the first forming wheel and the first positioning wheel of the fast bent pipe generator according to the present invention;
FIG. 4 is a schematic side view of a second forming wheel and a press bending wheel of the present invention;
fig. 5 is a schematic perspective view of the bent pipe formed by the bent pipe rapid generator according to the present invention.
Detailed Description
The following describes in detail a specific embodiment of the fast bent-tube generator according to the present invention with reference to the accompanying drawings:
as shown in fig. 1 to 5, the device comprises a base 10, four sets of operating wheels with installation shafts perpendicular to an arrangement direction are linearly arranged on the base 10 through four sets of brackets 1, the four sets of operating wheels sequentially comprise a first positioning wheel 21, a first forming wheel 22, a second forming wheel 23 and a second positioning wheel 24 along the arrangement direction, wherein the first positioning wheel 21 and the installation bracket 1 for installing the first positioning wheel 21 are detachably installed, the diameters of the first positioning wheel 21 and the second positioning wheel 24 are consistent and the installation heights are the same, the diameters of the first forming wheel 22 and the second forming wheel 23 are consistent and the installation heights are the same, the installation height of the first forming wheel 22 is lower than the installation height of the first positioning wheel 21, two ends of the installation shaft of the second forming wheel 23 are also hinged with a U-shaped rotating arm 231, a bending wheel 25 parallel to the second forming wheel 23 is installed on the U-shaped rotating arm 231, the first positioning wheel 21, the second positioning wheel 24 and the second positioning wheel 23 are installed on, The peripheral walls of the first forming wheel 22, the second forming wheel 23, the second positioning wheel 24 and the press bending wheel 25 are respectively provided with an annular arc groove 20, the vertical distance D1 between the annular arc groove 20 on the first forming wheel 22 and the annular arc groove 20 on the first positioning wheel 21, and the distance D2 between the annular arc groove 20 on the second forming wheel 23 and the annular arc groove 20 on the press bending wheel 25 are not smaller than the diameter of the steel pipe 100 to be bent, the horizontal distance D3 between the first forming wheel 22 and the second forming wheel 23 is smaller than the diameter R of the press bending wheel 25, and when the steel pipe 100 to be bent horizontally penetrates through the lower part of the first positioning wheel 21, the upper part of the first forming wheel 22, the gap between the upper part of the second forming wheel 23 and the press bending wheel 25, and the lower part of the second positioning wheel 24.
In the quick bent pipe generator, the first positioning wheel 21 and the second positioning wheel 24 are used for positioning and fixing two ends of a steel pipe 100 to be bent; the first forming wheel 22 and the second forming wheel 23 are used for enabling the steel pipe 100 to be bent pressed by the bending wheel 25 to be bent and deformed along the bending wheel 25; the vertical distance D1 between the annular arc groove 20 on the first forming wheel 22 and the annular arc groove 20 on the first positioning wheel 21, and the distance D2 between the annular arc groove 20 on the second forming wheel 23 and the annular arc groove 20 on the press bending wheel 25 are not less than the diameter of the steel pipe 100 to be bent, so that the steel pipe 100 to be bent can be horizontally penetrated through the lower part of the first positioning wheel 21, the upper part of the first forming wheel 22, the gap between the upper part of the second forming wheel 23 and the press bending wheel 25, and the lower part of the second positioning wheel 24; the horizontal distance D3 between the first forming wheel 22 and the second forming wheel 23 is smaller than the diameter R of the bending wheel 25, and the horizontal distance D3 has the function of ensuring that the first forming wheel 22 and the second forming wheel 23 can generate acting force with the steel pipe 100 to be bent pressed by the bending wheel 25, and the steel pipe 100 to be bent can generate deformation; the first positioning wheel 21 and the mounting bracket 1 for mounting the first positioning wheel 21 are detachably mounted, and the function of the first positioning wheel is that after the bent pipe is formed, the bent pipe can be taken out from the forming device by detaching the first positioning wheel 21.
When the quick bent pipe generator works, the bending wheel 25 is erected above the second forming wheel 23, so that a steel pipe 100 to be bent horizontally passes through the lower part of the first positioning wheel 21, the upper part of the first forming wheel 22, the gap between the upper part of the second forming wheel 23 and the bending wheel 25 and the lower part of the second positioning wheel 24 and is positioned in the annular arc groove 20 of each wheel, then the U-shaped rotating arm 231 is rotated, so that the bending wheel 25 rotates towards the first forming wheel 22 to be pressed downwards, and the annular arc groove 20 on the peripheral wall of the bending wheel 25 of the steel pipe 100 to be bent is bent to form a bent pipe; after the bent pipe is formed, when the bent pipe is taken down from the forming device, the first positioning wheel 21 is detached from the space between the two side plates 11 of the mounting bracket 1, the bending wheel 25 is erected above the second forming wheel 23, then the steel pipe is lifted upwards close to the first positioning wheel 21, and the steel pipe is pulled out from the forming device to one side close to the first positioning wheel 21.
The quick bent pipe generator is simple in structure and convenient and fast to operate, after a steel pipe 100 to be bent horizontally penetrates through the lower portion of the first positioning wheel 21, the upper portion of the first forming wheel 22, the gap between the upper portion of the second forming wheel 23 and the bending wheel 25 and the lower portion of the second positioning wheel 24, only the bending wheel 25 is required to be pressed and formed, in the pressing and forming process, although the steel pipe is subjected to large force, because the wheels, particularly the first forming wheel 22, the second forming wheel 23 and the bending wheel 25, are provided with the annular arc grooves 20 on the peripheral walls, when in processing, the steel pipe 100 is positioned in the annular arc grooves 20 of the wheels, the annular arc grooves 20 limit the steel pipe 100, the deviation of the steel pipe 100 in the processing process is avoided, the contact surface and the acting force surface of the annular arc grooves 20 and the steel pipe 100 are large, the steel pipe 100 is not prone to being flattened and damaged due to the large force, the bending forming rate is high, and each wheel comprises the first positioning wheel 21, the second positioning wheel 21, The first forming wheel 22, the second forming wheel 23, the second positioning wheel 24 and the bending wheel 25 can rotate, the friction force between the first forming wheel and the steel pipe 100 is small in the machining process, the surface of the steel pipe cannot be scratched, and the quality of the formed bent pipe is good.
According to the quick bent pipe generator, preferably, the base 10 is provided with the sliding groove 101, the lower end of the mounting bracket 1 provided with the first forming wheel 22 is inserted into the sliding groove 101 on the base 10, the screw 3 horizontally penetrates through the two groups of mounting brackets 1 respectively provided with the first forming wheel 22 of the second forming wheel 23 in sequence, the screw 3 is sleeved with the first locking nut 31 and the second locking nut 32, and the first locking nut 31 and the second locking nut 32 are respectively positioned on two sides of the mounting bracket 1 provided with the first forming wheel 22 and are axially contacted and locked with the mounting bracket 1. Under this setting, the installing support 1 of installing first forming wheel 22 can remove for spout 101 on the base 10 to realize the adjustment of first forming wheel 22 and the adjustment of second forming wheel 23 interval, in order to adapt to the preparation of the return bend of different degree of depth, different arc length, when adjusting the position of first forming wheel 22, only need cooperate first lock nut 31 and the regulation of second lock nut 32 can.
In the quick bent pipe generator of the present invention, preferably, the free end of the U-shaped rotating arm 231 is provided with a handle 232. The handle 232 is arranged to facilitate the operation of pressing the elbow by the bending wheel 25.
The present invention relates to a fast bent pipe generator, and preferably, the bottom of the base 10 is installed with a moving wheel 102. The moving wheel 102 is provided to facilitate the movement of the molding apparatus.
According to the quick bent pipe generator, the vertical distance D1 between the annular arc groove 20 on the first forming wheel 22 and the annular arc groove 20 on the first positioning wheel 21 and the distance D2 between the annular arc groove 20 on the second forming wheel 23 and the annular arc groove 20 on the press bending wheel 25 are generally consistent with the diameter of a steel pipe 100 to be bent, and when the distances are consistent, the horizontal steel pipe with two ends not bent can be guaranteed to keep higher levelness. Here, it should be noted that the vertical distance D1 between the circular arc groove 20 on the first forming wheel 22 and the circular arc groove 20 on the first positioning wheel 21, the distance D2 between the circular arc groove 20 on the second forming wheel 23 and the circular arc groove 20 on the bending wheel 25 are generally consistent with the diameter of the steel pipe 100 to be bent, and it is not required that the vertical distance D1 between the circular arc groove 20 on the first forming wheel 22 and the circular arc groove 20 on the first positioning wheel 21, the distance D2 between the circular arc groove 20 on the second forming wheel 23 and the circular arc groove 20 on the bending wheel 25 are completely equal in size to the diameter of the steel pipe 100 to be bent, which generally means that the vertical distance D1 between the circular arc groove 20 on the first forming wheel 22 and the circular arc groove 20 on the first positioning wheel 21, the distance D2 between the circular arc groove 20 on the second forming wheel 23 and the circular arc groove 20 on the bending wheel 25 are not different in size from the diameter of the steel pipe 100 to be bent, the vertical distance D1 between the circular arc groove 20 on the first forming wheel 22 and the circular arc groove 20 on the first positioning wheel 21, and the distance D2 between the circular arc groove 20 on the second forming wheel 23 and the circular arc groove 20 on the bending wheel 25 are usually slightly larger than the diameter of the steel pipe 100 to be bent.
According to the quick bent pipe generator, the first positioning wheel 21 and the mounting bracket 1 for mounting the first positioning wheel 21 are detachably mounted, and particularly, the mounting shaft of the first positioning wheel 21 can be locked by bolts after penetrating through two side plates of the mounting bracket 1. Under this structure, when dismantling, only need to unscrew the bolt, take off first positioning wheel 21 can.
For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all should be considered as belonging to the protection scope of the invention.

Claims (4)

1. A fast generator for bent pipes is characterized in that: the device comprises a base, wherein four groups of working wheels with installation shafts vertical to the arrangement direction are linearly arranged on the base through four groups of supports, the four groups of working wheels are sequentially provided with a first positioning wheel, a first forming wheel, a second forming wheel and a second positioning wheel along the arrangement direction, the first positioning wheel and the installation support for installing the first positioning wheel are detachably installed, the diameters of the first positioning wheel and the second positioning wheel are consistent and the installation heights of the first forming wheel and the second forming wheel are the same, the installation height of the first forming wheel is lower than the installation height of the first positioning wheel, two ends of the installation shaft of the second forming wheel are also hinged with a U-shaped rotating arm, a bending wheel parallel to the second forming wheel is installed on the U-shaped rotating arm, and the peripheral walls of the first positioning wheel, the first forming wheel, the second positioning wheel and the bending wheel are provided with an annular arc groove, the vertical spacing of the annular arc groove on the first forming wheel and the annular arc groove on the first positioning wheel, the spacing of the annular arc groove on the second forming wheel and the annular arc groove on the bending wheel are not smaller than the diameter of the steel pipe to be bent, the horizontal spacing of the first forming wheel and the second forming wheel is smaller than the diameter of the bending wheel, and during operation, the steel pipe to be bent is horizontally penetrated through the lower part of the first positioning wheel, the upper part of the first forming wheel, the upper part of the second forming wheel and the gap of the bending wheel and the lower part of the second positioning wheel.
2. The bent-tube fast generator of claim 1, wherein: the base is provided with a sliding groove, the lower end of the mounting bracket provided with the first forming wheel is inserted into the sliding groove on the base, a screw horizontally penetrates through the two groups of mounting brackets respectively provided with the first forming wheels of the second forming wheel, the screw is sleeved with a first locking nut and a second locking nut, and the first locking nut and the second locking nut are respectively positioned on two sides of the mounting bracket provided with the first forming wheel and are axially contacted and locked with the mounting bracket.
3. The bent-tube fast generator of claim 1, wherein: the free end of the U-shaped rotating arm is provided with a handle.
4. The bent-tube fast generator of claim 1, wherein: the bottom of the base is provided with a movable wheel.
CN202011171079.6A 2020-10-28 2020-10-28 Quick bent pipe generator Withdrawn CN112496108A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011171079.6A CN112496108A (en) 2020-10-28 2020-10-28 Quick bent pipe generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011171079.6A CN112496108A (en) 2020-10-28 2020-10-28 Quick bent pipe generator

Publications (1)

Publication Number Publication Date
CN112496108A true CN112496108A (en) 2021-03-16

Family

ID=74954232

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011171079.6A Withdrawn CN112496108A (en) 2020-10-28 2020-10-28 Quick bent pipe generator

Country Status (1)

Country Link
CN (1) CN112496108A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113500636A (en) * 2021-07-15 2021-10-15 安徽森源环境技术有限公司 Automatic production line for outer frame forming

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113500636A (en) * 2021-07-15 2021-10-15 安徽森源环境技术有限公司 Automatic production line for outer frame forming

Similar Documents

Publication Publication Date Title
KR20150140470A (en) Processing device and processing process for TV lower stand frame
CN102179416B (en) Wire-pressing roller for straight advancing type wire drawing machine
CN112496108A (en) Quick bent pipe generator
CN116765179B (en) Large pipe bending and forming equipment
KR20120005302U (en) Steel tube fabrication apparatus
CN105344851A (en) Pipe expanding device of automatic pipe expanding machine
CN213968454U (en) Steel pipe bending forming device
CN116393549A (en) Round steel straightening equipment and use method
CN111185862A (en) Pipe and rod part clamping mechanism for vertical high-frequency induction coil heating device
CN211938826U (en) Bending device
CN214290182U (en) Bending device
CN209935606U (en) Steel pipe bending machine with guide structure
CN112091018B (en) Biomass boiler power generation economizer elbow machining equipment and machining process
CN220371962U (en) Manual bending mechanism
CN215717227U (en) Formwork device
CN218049738U (en) Deviation preventing device for bending machine plate
CN214605865U (en) High pressure fuel pipe bending device
CN209816223U (en) Quick resetting device for installation and adjustment of radiant tube of continuous annealing furnace
CN220782534U (en) Hot dip galvanized steel sheet cutting device
CN215750904U (en) Horizontal press
CN215355498U (en) Bending device of bending machine
CN217393372U (en) Column type rotating cantilever beam bracket
CN218518576U (en) Device for mounting air pipe bolt
CN219724217U (en) Adjustable sewer corrugated pipe fixed bent pipe forming equipment
CN214719631U (en) Pipe bending die equipment

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WW01 Invention patent application withdrawn after publication
WW01 Invention patent application withdrawn after publication

Application publication date: 20210316