CN111167885A - Pressing device of straightening machine - Google Patents
Pressing device of straightening machine Download PDFInfo
- Publication number
- CN111167885A CN111167885A CN201911409427.6A CN201911409427A CN111167885A CN 111167885 A CN111167885 A CN 111167885A CN 201911409427 A CN201911409427 A CN 201911409427A CN 111167885 A CN111167885 A CN 111167885A
- Authority
- CN
- China
- Prior art keywords
- screw
- pressing
- hydraulic cylinder
- balancing
- cross beam
- 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
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/02—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts by rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F1/00—Bending wire other than coiling; Straightening wire
- B21F1/02—Straightening
Abstract
The invention discloses a balancing method of a pressing device of a straightening machine. The balance method is used for eliminating the clearance between a screw-down screw and a screw-down nut in a screw-down screw transmission mechanism, and comprises the following steps: removing the hydraulic cylinder arranged on the cross beam; and a hydraulic cylinder is arranged on the screw-down screw transmission mechanism, and the output end of the hydraulic cylinder is connected with the top of the screw-down screw. According to the balancing method of the straightener pressing device, the balancing mechanism arranged on the cross beam is removed, the structure of the pressing lead screw transmission mechanism is adjusted, the hydraulic cylinder is directly arranged at the top of the pressing lead screw transmission mechanism and is directly connected with the pressing lead screw, the balancing force for balancing weight can be directly set on the pressing lead screw, the accurate setting of the balancing force is ensured, the balancing force is kept constant in the pressing adjustment process, the gap between the pressing nut and the pressing lead screw can be eliminated, the synchronization error between the hydraulic cylinder and the pressing mechanism can be eliminated, the straightening precision is effectively improved, and the structure is simple and compact.
Description
Technical Field
The invention relates to the technical field of straightening machines, in particular to a pressing device of a straightening machine.
Background
FIG. 1 is a schematic structural view of a screw-down device of a straightening machine in the prior art, and FIGS. 2 and 3 are a top view and a left view of FIG. 1, respectively, and as shown in FIGS. 1 to 3, the screw-down device of the prior art straightening machine is mounted on a cross beam and used for driving an upper roller mounted below the cross beam to move up and down to adjust the rolling amount of the upper roller, and the prior screw-down device comprises a screw-down screw transmission mechanism mounted on the cross beam and a driving mechanism for driving a screw-down screw in the screw-down screw transmission mechanism to rotate; the driving mechanism comprises a motor, a coupler and a worm gear reducer, the motor is connected with the worm gear reducer through the coupler, and driven shafts of the worm gear reducer are connected with the pressing screws of the two pressing screw transmission mechanisms symmetrically arranged on two sides of the cross beam through the coupler; therefore, the four screw pressing transmission mechanisms can be driven to rotate by arranging the two driving mechanisms, so that the cross beam is driven to move up and down along the sliding plate on the inner side of the rack to adjust the pressing amount of the upper roller.
At present, in order to avoid the impact of a straightener during straightening and eliminate the gap between a pressing nut and a pressing lead screw so as to improve the adjustment precision of the pressing amount, the existing straightener pressing device further comprises a balance mechanism, wherein the balance mechanism is arranged on a cross beam and is used for eliminating the influence of the weight of the cross beam and components such as an upper roller and the like connected to the lower part of the cross beam; as shown in fig. 1-3, the balancing mechanism includes four hydraulic cylinder supports symmetrically disposed around the cross beam, and hydraulic cylinders mounted on the hydraulic cylinder supports, and output ends of the hydraulic cylinders are connected to the cross beam; in this way, the influence of the weight of the cross beam and the components connected with the lower part of the cross beam is eliminated by utilizing the hydraulic cylinder to provide pretension; however, since the components mounted under the beam are distributed unevenly relative to the center of the beam, for example, the upper roller is also connected with a universal shaft, when the existing balance mechanism is utilized, a synchronization error exists between the balance mechanism and the screw-down transmission mechanism, the accurate setting of the screw-down amount is seriously influenced, the straightening precision is insufficient, and the structural size of the equipment is increased due to the existing balance mechanism.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a pressing device of a straightening machine.
To this end, the invention discloses a balancing method of a straightener screw-down device, which is used for eliminating the gap between a screw-down screw and a screw-down nut in a screw-down screw transmission mechanism of the straightener screw-down device, and comprises the following steps:
removing the hydraulic cylinder arranged on the cross beam;
and a hydraulic cylinder is arranged on the screw-down screw transmission mechanism, and the output end of the hydraulic cylinder is connected with the top of the screw-down screw.
Preferably, in the balancing method of the straightener pressing device described above, the balancing method further comprises: a bracket is arranged on the top of the screw drive mechanism, and the hydraulic cylinder is arranged on the bracket.
Preferably, in the balancing method of the straightener pressing device, the hydraulic cylinder and the pressing screw are connected in a pin shaft connection mode.
Preferably, in the balancing method of the straightener pressing device, the hydraulic cylinder provides pretension for the pressing screw in an overbalanced mode.
Preferably, in the balancing method of the straightener pressing device, the hydraulic cylinder provides pretension for the pressing screw in an overbalance mode with an overbalance coefficient of 1.2-1.4.
Preferably, in the above balancing method of the straightener pressing means, the overbalance coefficient is 1.3.
The technical scheme of the invention has the following main advantages:
according to the balancing method of the straightener pressing device, the balancing mechanism arranged on the cross beam is removed, the structure of the pressing screw rod transmission mechanism is adjusted, the hydraulic cylinder is directly arranged at the top of the pressing screw rod transmission mechanism and is directly connected with the pressing screw rod, the balancing force for balancing weight can be directly set on the pressing screw rod, the accurate setting of the balancing force is ensured, the balancing force is kept constant in the pressing adjustment process, the gap between the pressing nut and the pressing screw rod can be eliminated, the synchronization error between the hydraulic cylinder and the pressing mechanism can be eliminated, the straightening precision is effectively improved, and the structure is simple and compact.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the attached figures:
FIG. 1 is a schematic view showing the construction of a pressing device of a leveler in the prior art;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a left side view of FIG. 1;
FIG. 4 is a schematic structural view of a straightener pressing device corresponding to a method for balancing a straightener pressing device according to an embodiment of the invention;
FIG. 5 is a top view of FIG. 4;
FIG. 6 is a left side view of FIG. 4;
fig. 7 is an enlarged view of a portion I of fig. 4.
Description of reference numerals:
1-pressing down a screw rod transmission mechanism, 11-pressing down a screw rod, 2-driving mechanism, 3-hydraulic cylinder, 4-cross beam and 5-balance mechanism.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1-3, the existing straightener pressing device is installed on a cross beam 4 and used for driving an upper roller installed below the cross beam 4 to move up and down so as to adjust the pressing amount of the upper roller, and the existing pressing device comprises a pressing lead screw transmission mechanism 1 installed on the cross beam 4 and a driving mechanism 2 used for driving a pressing lead screw 11 in the pressing lead screw transmission mechanism 1 to rotate; the four screw-down transmission mechanisms 1 are respectively and symmetrically arranged around the cross beam 4, the driving mechanism 2 comprises a motor, a coupler and a worm gear reducer, the motor is connected with the worm gear reducer through the coupler, and driven shafts of the worm gear reducer are respectively connected with the screw-down screws 11 of the two screw-down transmission mechanisms 1 which are symmetrically arranged on two sides of the cross beam 4 through the couplers; so, can realize four rotations of pushing down lead screw 11 that push down lead screw drive 1 through setting up two actuating mechanism 2 to drive crossbeam 4 and reciprocate in order to adjust the decrement of upper roll along the inboard slide of frame.
At present, in order to avoid the impact of a straightener during straightening and eliminate the gap between a pressing nut and a pressing lead screw 11 so as to improve the adjustment precision of the pressing amount, the existing straightener pressing device further comprises a balance mechanism 5, wherein the balance mechanism 5 is arranged on a cross beam 4 and is used for eliminating the influence of the weight of the cross beam 4 and components such as an upper roll and the like connected to the lower part of the cross beam; as shown in fig. 1-3, the balancing mechanism 5 includes four hydraulic cylinder supports symmetrically disposed on the periphery of the cross beam 4, and hydraulic cylinders mounted on the hydraulic cylinder supports, and output ends of the hydraulic cylinders are connected to the cross beam 4; in this way, the influence of the weight of the cross beam 4 and the components connected to the lower part thereof is eliminated by providing pretension with the hydraulic cylinder; however, since the components mounted below the cross beam 4 are unevenly distributed with respect to the center of the cross beam 4, for example, a universal joint is further connected to the upper roll, when the conventional balance mechanism 5 is used, a synchronization error occurs between the balance mechanism 5 and the screw down transmission mechanism 1, which seriously affects the accurate setting of the screw down amount, resulting in insufficient straightening accuracy, and the conventional balance mechanism 5 also results in an increase in the structural size of the apparatus.
As shown in fig. 4, in order to solve the above problems of the prior art with the balance mechanism 5, the embodiment of the present invention provides a balance method of a screw down device of a leveler, which can balance the weight of a beam 4 and a member connected to a lower portion thereof to eliminate a gap between a screw down shaft 11 and a screw down nut in a screw down transmission mechanism 1 of the screw down device of the leveler, the balance method comprising:
dismantling the hydraulic cylinder arranged on the cross beam 4;
the hydraulic cylinder 3 is arranged on the screw-down transmission mechanism 1, and the output end of the hydraulic cylinder 3 is connected with the top of the screw-down 11.
Preferably, in an embodiment of the present invention, the balancing method further includes: a bracket is mounted on the top of the screw down transmission 1, and the hydraulic cylinder 3 is mounted on the bracket.
Preferably, in an embodiment of the present invention, the balancing method further includes: the hydraulic cylinder 3 and the screw-down screw 11 are connected by a pin shaft connection mode.
Preferably, in an embodiment of the present invention, the balancing method further includes: the hydraulic cylinder 3 provides pretension for the screw-down 11 in an overbalanced manner. Specifically, the overbalance mode represents: the pretension force provided by the hydraulic cylinder 3 is larger than the total weight of the cross beam 4 and the upper roll and other components connected with the lower part of the cross beam; for example, the total weight of the beam 4 and the upper roll connected to the lower part thereof is set to be a, and when the overbalance mode is adopted, the pretension force needs to be greater than a, for example, the weight is set to be 1.3A, and 1.3 represents the overbalance coefficient of the overbalance mode;
preferably, in the embodiment of the invention, the hydraulic cylinder 3 provides pretension for the screw-down screw rod 11 in an overbalance mode with an overbalance coefficient of 1.2-1.4; further preferably, the overbalance factor is 1.3.
The principle of the balancing method of the straightener pressing device provided by the embodiment of the invention is explained by specific examples;
as shown in the attached figures 5-7, based on the balancing method of the straightener pressing device provided by the above, the embodiment of the invention provides the straightener pressing device, which comprises the following components: the device comprises a cross beam 4, a screw-down transmission mechanism 1 and a driving mechanism 2, wherein the screw-down transmission mechanism 1 is arranged on the cross beam 4, the driving mechanism 2 is used for driving the screw-down transmission mechanism 1, the screw-down transmission mechanism 1 comprises screw-down screws 11 arranged on the cross beam 4 and screw-down nuts connected with the screw-down screws 11, the screw-down transmission mechanisms 1 are four, the four screw-down transmission mechanisms 1 are respectively and symmetrically arranged around the cross beam 4, the driving mechanism 2 comprises a motor, a coupler and a worm gear reducer, the motor is connected with the worm gear reducer through the coupler, driven shafts of the worm gear reducer are respectively connected with the screw-down screws 11 of the two screw-down transmission mechanisms 1 which are symmetrically arranged at two sides of the cross beam 4 through the coupler, the driving mechanisms 2; the screw-down device further comprises a hydraulic cylinder 3, the hydraulic cylinder 3 is installed on the screw-down transmission mechanism 1, and the output end of the hydraulic cylinder 3 is connected with the top of the screw-down rod 11.
When the straightener pressing device provided by the embodiment of the invention is used, the pretension force of the hydraulic cylinder 3 on the screw drive mechanism 1 is determined according to the weight of the cross beam 4 and the upper roll and other components connected with the lower part of the cross beam so as to eliminate the influence of the weight of the cross beam 4 and the upper roll and other components connected with the lower part of the cross beam; and then a motor is started, the motor drives a screw pressing down screw rod 11 connected with a worm gear reducer to rotate through a coupler and the worm gear reducer, the screw pressing down screw rod 11 moves up and down while rotating, and therefore the cross beam 4 is driven to move up and down along a sliding plate on the inner side of the rack so as to adjust the pressing amount of the upper roller.
Preferably, in the embodiment of the present invention, in order to facilitate the detachment and installation of the hydraulic cylinder 3 and improve the structural stability of the screw-down device, the screw-down device further includes a hydraulic cylinder bracket, which is mounted on the top of the screw-down drive mechanism 1 and is used for supporting the hydraulic cylinder 3.
Preferably, the hydraulic cylinder 3 is connected to the screw-down 11 by means of a pin connection.
Specifically, as shown in fig. 7, in the embodiment of the present invention, the screw-down device further includes a pin, a connecting shaft is fixed at the output end of the hydraulic cylinder 3, the connecting shaft is provided with an open slot, a first connecting pin hole adapted to the pin is formed in a side end surface of both sides of the open slot of the connecting shaft, and a second connecting pin hole adapted to the pin is formed in a side end surface of the top of the screw-down screw 11. So set up, when carrying out pneumatic cylinder 3 and the dismouting of pushing down lead screw 11, make the round pin axle wear out/pass first connecting pin hole and second connecting pin hole and can realize pneumatic cylinder 3 and the dismouting of pushing down lead screw 11, convenient operation is quick.
Preferably, in the embodiment of the present invention, the pin shaft is provided with a limiting groove, the limiting groove is detachably provided with a limiting stopper, and when the pin shaft is connected with the connecting shaft and the screw 11 is pressed down, the limiting stopper is located on the outer side of the connecting shaft. So set up, utilize limit baffle's limiting displacement, can improve the stability of round pin hub connection mode, guarantee this screw-down device's structural stability.
Further, in order to ensure that the influence of the weight of the cross beam 4 and the upper roll connected to the lower portion thereof can be completely eliminated, in the embodiment of the present invention, the hydraulic cylinder 3 provides the pretension force to the screw 11 in an over-balanced manner.
It can be seen that the balancing method of the straightener pressing device provided by the embodiment of the invention can directly set the balancing force for balancing the weight on the pressing screw 11 by removing the balancing mechanism arranged on the cross beam 4 and adjusting the structure of the pressing screw transmission mechanism 1, directly arranging the hydraulic cylinder 3 at the top of the pressing screw transmission mechanism 1 and directly connecting the hydraulic cylinder 3 with the pressing screw 11, thereby ensuring the accurate setting of the balancing force and the maintenance of the balancing force in the pressing adjustment process, not only eliminating the gap between the pressing nut and the pressing screw 11, but also eliminating the synchronization error between the hydraulic cylinder 3 and the pressing mechanism, effectively improving the straightening precision, and having simple and compact structure.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some of the technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A balancing method of a screw down device of a straightening machine is characterized in that the balancing method is used for eliminating the gap between a screw down screw and a screw down nut in a screw down screw transmission mechanism of the screw down device of the straightening machine, and the balancing method comprises the following steps:
removing the hydraulic cylinder arranged on the cross beam;
and a hydraulic cylinder is arranged on the screw-down screw transmission mechanism, and the output end of the hydraulic cylinder is connected with the top of the screw-down screw.
2. The method of balancing a straightener press down of claim 1 further comprising: a bracket is arranged on the top of the screw drive mechanism, and the hydraulic cylinder is arranged on the bracket.
3. The method for balancing a straightener pressing device according to claim 2, wherein the hydraulic cylinder and the pressing screw are connected by a pin connection.
4. The method for balancing a straightener screw down device according to claim 3 wherein the hydraulic cylinder provides pretension to the screw down screw in an overbalanced manner.
5. The balancing method of the straightener pressing device of claim 4, wherein the hydraulic cylinder provides pretension to the pressing screw in an overbalance mode with an overbalance coefficient of 1.2-1.4.
6. The method of balancing a straightener press down of claim 5 wherein the overbalance factor is 1.3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911409427.6A CN111167885A (en) | 2019-12-31 | 2019-12-31 | Pressing device of straightening machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911409427.6A CN111167885A (en) | 2019-12-31 | 2019-12-31 | Pressing device of straightening machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111167885A true CN111167885A (en) | 2020-05-19 |
Family
ID=70649116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911409427.6A Pending CN111167885A (en) | 2019-12-31 | 2019-12-31 | Pressing device of straightening machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111167885A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202087634U (en) * | 2011-05-31 | 2011-12-28 | 太原重工股份有限公司 | Medium plate prestraightening machine |
| CN203209439U (en) * | 2013-03-26 | 2013-09-25 | 浙江波威钢构有限公司 | Measuring device for abrasion gap of mill press screw pair |
| CN105013874A (en) * | 2015-07-30 | 2015-11-04 | 中国重型机械研究院股份公司 | Novel straightening machine pressing pre-tightening device |
| CN105750337A (en) * | 2016-04-25 | 2016-07-13 | 山东钢铁股份有限公司 | Adjusting method for BD rolling mill pressing system |
| CN206824428U (en) * | 2017-03-01 | 2018-01-02 | 中冶华天工程技术有限公司 | Section straightener is depressed and bascule |
-
2019
- 2019-12-31 CN CN201911409427.6A patent/CN111167885A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202087634U (en) * | 2011-05-31 | 2011-12-28 | 太原重工股份有限公司 | Medium plate prestraightening machine |
| CN203209439U (en) * | 2013-03-26 | 2013-09-25 | 浙江波威钢构有限公司 | Measuring device for abrasion gap of mill press screw pair |
| CN105013874A (en) * | 2015-07-30 | 2015-11-04 | 中国重型机械研究院股份公司 | Novel straightening machine pressing pre-tightening device |
| CN105750337A (en) * | 2016-04-25 | 2016-07-13 | 山东钢铁股份有限公司 | Adjusting method for BD rolling mill pressing system |
| CN206824428U (en) * | 2017-03-01 | 2018-01-02 | 中冶华天工程技术有限公司 | Section straightener is depressed and bascule |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5361618A (en) | Method and apparatus for adjusting bending rolls | |
| CN210589028U (en) | Engine dismounting rack | |
| CN111167885A (en) | Pressing device of straightening machine | |
| US5301583A (en) | Rotary cutting apparatus | |
| CN211660788U (en) | Pressing device of straightening machine | |
| CN117206325A (en) | Non-ferrous metal calendering equipment of skew prevention | |
| CN101912905A (en) | A kind of plate coiling machine for long semicircular workpieces | |
| CN215970573U (en) | Servo control glue gluing device | |
| CN107377813A (en) | A kind of furling plate round machine for being capable of automatic discharging | |
| CN207641834U (en) | A kind of Novel revolving screen | |
| CN116511298A (en) | Bending device for manufacturing color steel structure | |
| CN212525510U (en) | Novel H-shaped steel straightening machine | |
| CN112518660B (en) | Dismounting device for rolling pin of nut pair of subway vehicle door | |
| EP4056280A1 (en) | A drive train assembly for a roll crusher | |
| CN212494622U (en) | Upper-mounted worm gear pressing structure leveler | |
| CN212083268U (en) | Packing carton check out test set | |
| CN208374904U (en) | A kind of equipment for grinding based on Crankshaft Machining | |
| CN211518582U (en) | Limiting device for compression roller | |
| CN117644175B (en) | Multifunctional forging operation equipment | |
| CN217226972U (en) | Axial adjustment mechanism of printing plate roller | |
| CN105499333B (en) | A kind of bender with D axle guiders | |
| CN111001677A (en) | Corner shape correction machining mechanism based on H-shaped steel machining | |
| CN215143366U (en) | Continuous casting and rolling speed measuring device | |
| CN110814091A (en) | Leveling machine for producing double-shaft tracking photovoltaic support | |
| CN220658799U (en) | High-precision metal part leveling device |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200519 |