CN111282999A - Wide and thick plate rolling mill main transmission shaft balancing device with fault monitoring and protecting functions - Google Patents
Wide and thick plate rolling mill main transmission shaft balancing device with fault monitoring and protecting functions Download PDFInfo
- Publication number
- CN111282999A CN111282999A CN202010122468.3A CN202010122468A CN111282999A CN 111282999 A CN111282999 A CN 111282999A CN 202010122468 A CN202010122468 A CN 202010122468A CN 111282999 A CN111282999 A CN 111282999A
- Authority
- CN
- China
- Prior art keywords
- transmission shaft
- main transmission
- hydraulic cylinder
- fault
- driving hydraulic
- 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
- B21B—ROLLING OF METAL
- B21B35/00—Drives for metal-rolling mills, e.g. hydraulic drives
- B21B35/14—Couplings, driving spindles, or spindle carriers specially adapted for, or specially arranged in, metal-rolling mills
- B21B35/148—Spindle carriers or balancers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B33/00—Safety devices not otherwise provided for; Breaker blocks; Devices for freeing jammed rolls for handling cobbles; Overload safety devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a main transmission shaft balancing device of a wide and thick plate rolling mill with fault monitoring and protecting functions, which comprises a position sensor, a driving hydraulic cylinder base, a balancing device bottom plate, a swinging support fixing base, a swinging support and a vertical connecting rod support, wherein the position sensor is arranged on the driving hydraulic cylinder base; when the angle position of the main transmission shaft is fixed, the main transmission shaft does not swing up and down or only swings at a small angle, and when the main transmission shaft rotates, if the obvious change quantity of the position value of the driving hydraulic cylinder sensor appears, the main transmission shaft assembly is indicated to have a fault, so that the real-time fault monitoring of the main transmission shaft assembly is realized, and alarm or shutdown interlocking can be set according to the difference of the detection value change quantity of the position sensor under the condition.
Description
Technical Field
The invention belongs to the technical field of equipment in the steel industry, and particularly relates to a balance device of a main transmission shaft of a wide and thick plate rolling mill with fault monitoring and protecting functions, which is used for realizing real-time online monitoring and alarming of faults of a main transmission shaft assembly and automatic control interlocking protection while realizing self-weight balance of the main transmission shaft of the wide and thick plate rolling mill.
Background
The wide and thick plate rolling mill has large torque required by the roller, the size and the weight of the main transmission shaft are large, and in order to reduce the influence of the dead weight of the main transmission shaft of the rolling mill on the rotation of the roller and the main transmission shaft, the wide and thick plate rolling mill is provided with a main transmission shaft balancing device to balance the dead weight of the main transmission shaft.
However, in the existing various types of main transmission shaft balancing devices, the main transmission shaft balancing device has a single function and only plays a role in balancing the dead weight of the main transmission shaft.
In the actual production process of the main transmission shaft and the components thereof of the wide and thick plate rolling mill, the damage and damage mode is fatigue damage due to the fact that the main transmission shaft and the components thereof bear large alternating torque load and impact load. For the main transmission shaft assembly, the size is limited by the size of the whole rolling mill equipment, for example, the diameter of the cross packet (or the sliding block type coupling) at the roller side of the main transmission shaft assembly cannot exceed the minimum diameter of the rolling mill roller, otherwise, the cross packets (or the sliding block type coupling) at the roller sides of the upper main transmission shaft assembly and the lower main transmission shaft assembly can generate interference collision when rotating, so the fatigue torque of the cross packet (or the sliding block type coupling) assembly and the like is limited by the size. Based on the factors, main transmission shaft assembly damage accidents frequently occur in various wide and thick plate factories. And main drive shaft subassembly trouble in case appear, in case not in time discover, often can lead to the main drive shaft subassembly fracture, in case damage fracture appears, often can lead to main drive shaft spiale balance vertical connecting rod support to damage, spindle nose supporting component damage, another main drive shaft subassembly damage, work roll flat head major equipment accidents such as rupture even. Often with large equipment and production downtime losses.
The main transmission shaft assembly is mostly in fatigue damage (the average annual stress cycle number is about 70 ten thousand), the bearing characteristic parameters such as torque and the like in fault are normal, and the fault precursors and the equal amount of the torque and the current in the fault condition do not change under the fault condition and the normal condition of the main transmission shaft, so that the equal amount of the conventional torque and the current cannot be used as the real-time online monitoring characteristic amount of the fault of the main transmission shaft assembly.
If the effective main transmission shaft fault characteristic quantity can be found by combining with the main transmission shaft balancing device and the effective real-time online monitoring and protecting device for the main transmission shaft component fault of the wide and thick plate rolling mill is arranged according to the effective main transmission shaft fault characteristic quantity, when the main transmission shaft component of the wide and thick plate begins to have a fault, the real-time online monitoring alarm and the shutdown protection are very necessary.
The balance device of the main transmission shaft of the wide and thick plate rolling mill at home and abroad is not designed with the function at present, and the balance device and the technology of the main transmission shaft with the function are not used in actual production.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a main transmission shaft balancing device of a wide and thick plate rolling mill with fault monitoring and protecting functions, so that the balancing device not only plays a role in balancing the weight of the main transmission shaft, but also can realize real-time online monitoring, alarming and shutdown protection under the condition that the main transmission shaft assembly of the wide and thick plate is in fault, find out major equipment fault hidden danger in time and carry out automatic shutdown protection, and avoid major equipment loss caused by major equipment fault of the main transmission shaft assembly of the wide and thick plate rolling mill.
In order to solve the technical problems, the invention adopts the following technical scheme:
a main transmission shaft balancing device of a wide and thick plate rolling mill with fault monitoring and protecting functions comprises a position sensor, a driving hydraulic cylinder base, a balancing device bottom plate, a swing support fixing base, a swing support and a vertical connecting rod support; the driving hydraulic cylinder base is arranged on the balancing device bottom plate, the driving hydraulic cylinder is arranged on the driving hydraulic cylinder base, the driving end of the driving hydraulic cylinder is connected with the swing support fixing base, the swing support fixing base is connected with the swing support, the swing support is connected with the vertical connecting rod support, the vertical connecting rod support is used for being connected with a main transmission shaft, and the position sensor is arranged in the cylinder body of the driving hydraulic cylinder;
when the angle position of the main transmission shaft is fixed, the main transmission shaft does not swing up and down or only swings at a small angle, and when the main transmission shaft rotates, if the obvious change quantity of the position value of the driving hydraulic cylinder sensor appears, the main transmission shaft assembly is indicated to have a fault, so that the real-time fault monitoring of the main transmission shaft assembly is realized, and alarm or shutdown interlocking can be set according to the difference of the detection value change quantity of the position sensor under the condition.
Furthermore, the real-time acquisition and comparison of the change value of the oscillating quantity of the main transmission shaft caused by the fault of the main transmission shaft assembly is realized through the acquisition, calculation and automatic analysis of the data of the position sensor of the real-time monitoring quantity, the fault alarm is carried out when the change value exceeds an alarm value, and the shutdown interlocking protection is carried out when the change value exceeds a shutdown interlocking value, so that the real-time online monitoring alarm and the shutdown protection are realized.
Compared with the prior art, the invention has the beneficial technical effects that:
the balancing device can realize the function of balancing the dead weight of the main transmission shaft and can also realize the functions of real-time online monitoring and protection of the faults of the main transmission shaft assembly. The real-time online monitoring and protecting functions of the main transmission shaft assembly faults are very important for the wide and thick plate production line, and major equipment accidents can be avoided.
The balance device takes the swing amount (central position variation) of the main transmission shaft body as the characteristic quantity capable of reflecting the abnormal state of equipment when the main transmission assembly of the wide and thick plate rolling mill breaks down, and carries out real-time online monitoring on the faults of the main transmission shaft assembly. The real-time online monitoring and protecting functions of the main transmission shaft assembly faults are ingeniously combined with the balancing function. The real-time monitoring quantity is acquired, calculated and used by an automatic analysis program, so that the change value of the main transmission shaft oscillating quantity caused by the main transmission shaft assembly fault is acquired and compared in real time, if the change value exceeds an alarm value, fault alarm is carried out, and if the change value exceeds a shutdown interlocking value, shutdown interlocking protection is carried out. Therefore, real-time on-line monitoring alarm and shutdown protection of the electrical device are realized.
The invention is suitable for various types of main transmission shafts of rolling mills, such as a cross-shaped bag type main transmission shaft, a sliding block type main transmission shaft and the like.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a layout diagram of a main transmission shaft balancing device of a wide and thick plate rolling mill with fault monitoring and protection functions
FIG. 2 is a front view of a main transmission shaft balancing device of a wide and thick plate rolling mill with fault monitoring and protection functions
FIG. 3 is a side view of a main transmission shaft balancing device of a wide and thick plate rolling mill with fault monitoring and protection functions
FIG. 4 is a top view of a main transmission shaft balancing device of a wide and thick plate rolling mill with fault monitoring and protection functions
FIG. 5 is a block diagram of the electrical system components and process control for real-time online monitoring and protection of the faults of the mating main drive shaft assembly of the present invention;
description of reference numerals: 1-lower main drive shaft balancing device, 101-first position sensor, 102-first driving hydraulic cylinder, 103-first driving hydraulic cylinder base, 104-balancing device bottom plate, 105-first swing support fixing base, 106-first swing support, 107-first vertical connecting rod support, 2-upper main drive shaft balancing device, 201-second position sensor, 202-second driving hydraulic cylinder, 203-second driving hydraulic cylinder base, 204-second swing support fixing base, 205-second swing support, 206-second vertical connecting rod support, 3-lower main drive shaft, 4-upper main drive shaft.
Detailed Description
As shown in fig. 1 to 4, in this embodiment, when the wide and thick plate rolling mill main transmission shaft balancing device with fault monitoring and protection functions is used, two sets of devices are required to be used in cooperation, including a lower main transmission shaft balancing device 1 and an upper main transmission shaft balancing device 2: the lower main transmission shaft balancing device 1 comprises a first position sensor 101, a first driving hydraulic cylinder 102, a first driving hydraulic cylinder base 103, a first balancing device bottom plate 104, a first swing support fixing base 105, a first swing support 106 and a first vertical connecting rod support 107, wherein the first vertical connecting rod support 107 is used for connecting the lower main transmission shaft 3, and the first position sensor 101 is arranged in a cylinder body of the first driving hydraulic cylinder; the upper main transmission shaft balancing device comprises a second position sensor 201, a second driving hydraulic cylinder 202, a second driving hydraulic cylinder base 203, a second swing support fixing base 204, a second swing support 205 and a second vertical connecting rod support 206, wherein the second vertical connecting rod support 206 is used for connecting the upper main transmission shaft 4, and the second position sensor 201 is arranged in a cylinder body of the second driving hydraulic cylinder 202.
And the driving hydraulic cylinders of the upper and lower main transmission shaft balancing devices are both in a middle trunnion supporting type.
The device balance the function realization process of the dead weight of the main transmission shaft is as follows: the balance device drives the cylinder head of the hydraulic cylinder to be hinged with a fork head of a swing support of the balance device, a fixed rotating shaft of the swing support is fixed by a fixed base of the swing support, the swing support can swing at a certain angle around the fixed rotating shaft of the swing support, the swing support supports the vertical connecting rod support, the vertical connecting rod support supports a bearing seat of a main transmission shaft slewing bearing installed on a main transmission shaft body, a main transmission shaft of a rolling mill is in the production process, in order to realize the adjustment of a roll gap, the vertical swinging is needed, the driving hydraulic cylinder always applies a fixed balance force to the balance device through a hydraulic control system, the balance device always supports the bearing seat of the main transmission shaft, and therefore the self-weight function of.
The device has the following implementation processes of the functions of real-time online fault monitoring and protection of the main transmission shaft assembly: when the roll gap of the rolling mill is changed, the main transmission shaft body drives the frame of the main transmission shaft balancing device to move up and down, the up-and-down movement of the balancing frame finally drives the cylinder rod of the driving hydraulic cylinder to stretch into and extend out of the cylinder barrel of the driving hydraulic cylinder, the position sensor in the cylinder barrel of the driving hydraulic cylinder can detect the position variation of the main transmission shaft body in real time, when the roll gap is not changed, when the main transmission shaft assembly rotates normally under the condition of no fault, the central position of the main transmission shaft does not change, namely, the main transmission shaft does not swing. When the roll gap is not changed, the angle position of the main transmission shaft is fixed and does not swing up and down, when the main transmission shaft rotates, if the obvious variation of the position value of the driving hydraulic cylinder sensor appears, the main transmission shaft assembly is indicated to have a fault, thereby realizing the real-time monitoring of the fault of the main transmission shaft assembly, and alarming or shutdown interlocking can be set according to the difference of the detection value variation under the condition of the position sensor. The position change value reflected by the position sensor can be changed due to the changes of the positions of an EGC (mechanical pressing device) and an HGC (hydraulic roll gap adjusting cylinder device) in the rolling process, when a special program is compiled and the position of the EGC is not changed, the balance device drives the position change of a hydraulic cylinder rod when the position of the HGC is slightly changed, namely the change value of the main transmission shaft oscillating quantity caused by the main transmission shaft assembly fault is really reflected, if the change value exceeds an alarm value, a fault alarm is carried out, and if the change value exceeds a shutdown interlocking value, the shutdown interlocking protection is carried out.
As shown in FIG. 5, the real-time monitoring amount acquisition, calculation and automatic analysis program is used in the specific process that when the rolling mill runs, a sensor in a driving hydraulic cylinder always detects the position value of a cylinder rod of the hydraulic cylinder in real time, when the rolling mill bites steel and is loaded into a rolling mode, and a loading signal occurs for 50 milliseconds, an electrical system PLC (programmable logic controller) -programmable logic controller records that the current position value detected by the position sensor is P0, then the real-time position value P detected by the position sensor is not recorded in real time, the absolute value △ P of the difference value between P and P0 is calculated in real time, △ P and the set alarm values A1 and △ P and the interlock stop value A2 are compared in real time, when △ P is greater than A1, a main transmission shaft operating picture triggers a yellow alarm for the fault of the main transmission shaft, when △ P is greater than A2, the PLC sends a stop command to a control CPU (central processing unit), and the PLC acquires, monitors, and protects the change of the fault of the main transmission shaft in real-time, and carries out the on-line protection when the fault protection of the PLC.
The on-line monitoring device and the balancing device manufactured according to the approach principle of the invention are applied to a production line of a steel-coated wide and thick plate, not only are the self-weight functions of the balancing main transmission shaft good, but also the functions are verified through multiple on-site actual use (for example, a cross-shaped assembly end cover jacking fault of the main transmission shaft of a roughing mill at 8, 18 and 13 days in 2019 and a cross-shaped package cross shaft of the main transmission shaft of the roughing mill at 9, 13 and 9 are alarm information given by the on-line monitoring device manufactured according to the approach principle of the invention, the main transmission assembly is found to be in fault by timely shutdown inspection, and major equipment accidents are avoided in time by fault finding).
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (2)
1. A main transmission shaft balancing device of a wide and thick plate rolling mill with fault monitoring and protection functions is characterized by comprising a position sensor, a driving hydraulic cylinder base, a balancing device bottom plate, a swing support fixing base, a swing support and a vertical connecting rod support; the driving hydraulic cylinder base is arranged on the balancing device bottom plate, the driving hydraulic cylinder is arranged on the driving hydraulic cylinder base, the driving end of the driving hydraulic cylinder is connected with the swing support fixing base, the swing support fixing base is connected with the swing support, the swing support is connected with the vertical connecting rod support, the vertical connecting rod support is used for being connected with a main transmission shaft, and the position sensor is arranged in the cylinder body of the driving hydraulic cylinder;
when the angle position of the main transmission shaft is fixed, the main transmission shaft does not swing up and down or only swings at a small angle, and when the main transmission shaft rotates, if the obvious change quantity of the position value of the driving hydraulic cylinder sensor appears, the main transmission shaft assembly is indicated to have a fault, so that the real-time fault monitoring of the main transmission shaft assembly is realized, and alarm or shutdown interlocking can be set according to the difference of the detection value change quantity of the position sensor under the condition.
2. The wide and thick plate rolling mill main transmission shaft balancing device with the fault monitoring and protecting function according to claim 1, characterized in that real-time acquisition and comparison of the change value of the main transmission shaft oscillating quantity caused by the main transmission shaft assembly fault is realized by acquisition, calculation and automatic analysis of the data of the position sensor through real-time monitoring quantity, fault alarm is performed when the change value exceeds an alarm value, and shutdown interlocking protection is performed when the change value exceeds a shutdown interlocking value, so that real-time online monitoring alarm and shutdown protection are realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010122468.3A CN111282999A (en) | 2020-02-27 | 2020-02-27 | Wide and thick plate rolling mill main transmission shaft balancing device with fault monitoring and protecting functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010122468.3A CN111282999A (en) | 2020-02-27 | 2020-02-27 | Wide and thick plate rolling mill main transmission shaft balancing device with fault monitoring and protecting functions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111282999A true CN111282999A (en) | 2020-06-16 |
Family
ID=71030856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010122468.3A Pending CN111282999A (en) | 2020-02-27 | 2020-02-27 | Wide and thick plate rolling mill main transmission shaft balancing device with fault monitoring and protecting functions |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111282999A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112355059A (en) * | 2020-12-17 | 2021-02-12 | 福建三钢闽光股份有限公司 | Fault detection method for heavy and medium plate mill stand roller |
| CN113399474A (en) * | 2021-05-26 | 2021-09-17 | 舞阳钢铁有限责任公司 | Method for quickly pre-judging faults of main connecting shaft of rolling mill roller |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1015942A (en) * | 1962-09-04 | 1966-01-05 | Schloemann Ag | Improvements in and relating to rolling mill stands |
| DE10163373C1 (en) * | 2001-12-22 | 2003-02-27 | Masch Und Werkzeugbau Gmbh | Changing the working rollers in a roll stand comprises arranging an upper supporting roller in a dismantling position below the maximum lifting position to drive the working roller set together with the lower supporting roller |
| CN101733288A (en) * | 2008-11-04 | 2010-06-16 | 上海重型机器厂有限公司 | Device for balancing upper and lower main transmission shafts of heavy and medium plate mill |
| CN101797587A (en) * | 2010-04-06 | 2010-08-11 | 王建国 | Hydraulic pressure balance device of twenty-roller steel plate cold rolling mill transmission roller and control method |
| CN102784802A (en) * | 2011-05-20 | 2012-11-21 | 宝山钢铁股份有限公司 | Device and method for monitoring state of cross cardan shaft of CVC rolling mill |
| CN105478489A (en) * | 2015-12-31 | 2016-04-13 | 中钢集团西安重机有限公司 | Connecting shaft self-balancing bracket device with floating adjusting function and adjusting method |
-
2020
- 2020-02-27 CN CN202010122468.3A patent/CN111282999A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1015942A (en) * | 1962-09-04 | 1966-01-05 | Schloemann Ag | Improvements in and relating to rolling mill stands |
| DE10163373C1 (en) * | 2001-12-22 | 2003-02-27 | Masch Und Werkzeugbau Gmbh | Changing the working rollers in a roll stand comprises arranging an upper supporting roller in a dismantling position below the maximum lifting position to drive the working roller set together with the lower supporting roller |
| CN101733288A (en) * | 2008-11-04 | 2010-06-16 | 上海重型机器厂有限公司 | Device for balancing upper and lower main transmission shafts of heavy and medium plate mill |
| CN101797587A (en) * | 2010-04-06 | 2010-08-11 | 王建国 | Hydraulic pressure balance device of twenty-roller steel plate cold rolling mill transmission roller and control method |
| CN102784802A (en) * | 2011-05-20 | 2012-11-21 | 宝山钢铁股份有限公司 | Device and method for monitoring state of cross cardan shaft of CVC rolling mill |
| CN105478489A (en) * | 2015-12-31 | 2016-04-13 | 中钢集团西安重机有限公司 | Connecting shaft self-balancing bracket device with floating adjusting function and adjusting method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112355059A (en) * | 2020-12-17 | 2021-02-12 | 福建三钢闽光股份有限公司 | Fault detection method for heavy and medium plate mill stand roller |
| CN113399474A (en) * | 2021-05-26 | 2021-09-17 | 舞阳钢铁有限责任公司 | Method for quickly pre-judging faults of main connecting shaft of rolling mill roller |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111282999A (en) | Wide and thick plate rolling mill main transmission shaft balancing device with fault monitoring and protecting functions | |
| CA2344289C (en) | Method and device for monitoring a bearing structure | |
| CN104787670B (en) | Horizontal steel coil clamp | |
| CN111318574A (en) | Real-time online fault monitoring and protecting device for main transmission shaft assembly of wide and thick plate rolling mill | |
| CN103743332B (en) | A kind of large-sized grinder main bearing oil film thickness monitoring device | |
| CN218387324U (en) | Motor redundancy control system used between process oil of rolling production line | |
| CN102784802B (en) | Device and method for monitoring state of cross cardan shaft of CVC rolling mill | |
| CN220104468U (en) | Rolling mill spindle device fault state on-line monitoring device and rolling mill spindle device | |
| CN107790507A (en) | Method for judging axial force of rolling working roll | |
| CN108994090A (en) | A kind of diagnostic method of down-pressing system of rolling mill failure | |
| CN108687320B (en) | Tightening and controlling device for roll gap measuring arm of clamp type online roll gap instrument | |
| CN106898509A (en) | A kind of mechanical switching device | |
| CN116251860A (en) | Bending machine running state detection system and reliability evaluation method | |
| Loginov et al. | Development of digital pressure observer in hydraulic cylinders for vertical balancing of rolling stand spindles | |
| CN209164567U (en) | A kind of weighing belt special reduction gear | |
| CN106706347A (en) | Interference force detection method and interference force detection device for torsion bar assembly | |
| CN114798766B (en) | Fault processing method for rolling mill signal | |
| CN208253192U (en) | rotary joint safety monitoring system | |
| CN202936460U (en) | Water-cooling roller monitoring system | |
| CN212007798U (en) | Vibration monitoring device for rolling mill roller bearing | |
| CN101007319A (en) | Roll system hanging balance device of multi-roller rolling mill | |
| CN113399474B (en) | Main connecting shaft fault quick pre-judging method for rolling mill roller | |
| CN108687318B (en) | Protection device of roll gap measuring mechanism of jaw type online roll gap instrument | |
| CN109665282A (en) | A kind of belt conveyor roller for having intelligence, real-time detection function | |
| CN220092533U (en) | Tension abnormality control system of rolling mill control 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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200616 |