CN213232394U - Quenching groove waste heat recovery system of recycling - Google Patents
Quenching groove waste heat recovery system of recycling Download PDFInfo
- Publication number
- CN213232394U CN213232394U CN202020922006.5U CN202020922006U CN213232394U CN 213232394 U CN213232394 U CN 213232394U CN 202020922006 U CN202020922006 U CN 202020922006U CN 213232394 U CN213232394 U CN 213232394U
- Authority
- CN
- China
- Prior art keywords
- waste heat
- machine
- tank
- water tank
- recycling
- 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- Withdrawn - After Issue
Links
Images
Landscapes
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The utility model relates to the technical field of waste heat recovery, in particular to a waste heat recovery and recycle system of a quenching tank, which can collect a large amount of waste heat generated by a heat treatment process in the wheel hub manufacturing process and transmit the collected high-quality heat energy to a wheel hub machining cleaning process and an auxiliary facility for heat supply so as to achieve the purposes of energy recycling, cost reduction and efficiency improvement; the quenching tank waste heat recycling system comprises a quenching tank, a waste heat recycling heat exchanger, a waste heat recycling circulating pump, a machine-added waste heat utilizing heat exchanger, a machine-added waste heat utilizing circulating pump, a quenching tank waste heat storage water tank and a water replenishing pump, wherein the waste heat recycling circulating pump is used for pumping circulating water of the waste heat recycling heat exchanger, a waste heat recycling electromagnetic valve is installed on a waste heat recycling water return pipeline, the machine-added waste heat utilizing circulating pump is used for pumping circulating water of the machine-added waste heat utilizing heat exchanger, and the waste heat utilizing electromagnetic valve is installed on a machine-added waste heat utilizing water return pipeline between the machine-added.
Description
Technical Field
The utility model relates to a waste heat recovery's technical field especially relates to a quenching groove waste heat recovery system of recycling.
Background
In recent years, energy conservation and environmental protection tend to be achieved, and energy conservation, emission reduction and circular economy become inevitable choices for the development of a plurality of enterprises. Under the background, the waste heat recycling technology is gradually developed, the production process and the production characteristics are combined, waste heat generated in the factory production process is recycled through a series of technical means, energy utilization channels are widened, and meanwhile, the energy consumption cost of enterprises can be reduced, so that the competitiveness of the enterprises is improved, and the sustainable development of the enterprises is promoted.
The heat treatment waste heat recovery technology has carried out a large amount of applications in the industry waste heat recovery field, the utility model discloses to automobile wheel hub manufacturing process, design one set of quenching groove waste heat recovery system of recycling based on heat treatment process.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a quenching groove waste heat recovery system of recycling can collect a large amount of waste heat that the heat treatment process produced in the wheel hub manufacturing process to convey wheel hub machining cleaning process and auxiliary facilities heat supply to the high-quality heat energy of collection, in order to reach the purpose that energy was recycled, cost reduction increased.
In order to achieve the above purpose, the utility model is realized by adopting the following technical scheme:
a quenching tank waste heat recovery and recycling system comprises a quenching tank, a waste heat recovery heat exchanger, a waste heat recovery circulating pump, an added waste heat utilization heat exchanger, an added waste heat utilization circulating pump, a quenching tank waste heat storage water tank and a water replenishing pump, wherein the waste heat recovery heat exchanger is arranged in the quenching tank, the waste heat recovery circulating pump pumps circulating water from the quenching tank waste heat storage water tank for the waste heat recovery heat exchanger, a waste heat recovery solenoid valve is arranged on a waste heat recovery water return pipeline between the waste heat recovery heat exchanger and the quenching tank waste heat storage water tank, the added waste heat utilization heat exchanger is arranged in an added cleaning water tank, the added waste heat utilization circulating pump pumps circulating water from the quenching tank waste heat storage water tank for the added waste heat utilization heat exchanger, the waste heat utilization solenoid valve is arranged on an added waste heat utilization water return pipeline between the added waste heat utilization heat exchanger and the, the water replenishing pump is connected with a pipeline of a waste heat storage water tank of the quenching tank.
In a possible technical scheme, the heat recovery device further comprises an auxiliary waste heat utilization heat exchanger and an auxiliary waste heat utilization circulating pump, the auxiliary waste heat utilization heat exchanger is installed in an auxiliary water tank, the auxiliary waste heat utilization circulating pump is used for pumping circulating water in a self-quenching tank waste heat storage water tank of the auxiliary waste heat utilization heat exchanger, and an auxiliary waste heat utilization electromagnetic valve is installed on an auxiliary waste heat utilization water return pipeline between the auxiliary waste heat utilization heat exchanger and the quenching tank waste heat storage water tank.
In a possible technical scheme, still include waste heat recovery and utilize the controller, it is provided with temperature sensor one to quench the inslot, machine adds and is provided with temperature sensor two in the washing water tank, installs level sensor and temperature sensor three in quenching groove waste heat storage water tank, waste heat recovery circulating pump, waste heat recovery solenoid valve, moisturizing pump, machine add waste heat utilization circulating pump, waste heat utilization solenoid valve, supplementary waste heat utilization circulating pump, supplementary waste heat utilization solenoid valve, temperature sensor one, temperature sensor two, level sensor and temperature sensor three with waste heat recovery and utilize controller signal connection.
In one possible technical scheme, the system is realized according to any one of the quenching tank waste heat recycling systems, when the system starts to work, a waste heat recycling controller analyzes a liquid level signal of a quenching tank waste heat storage water tank, if the liquid level of the quenching tank waste heat storage water tank is lowered, a water replenishing pump is controlled to be started to replenish water for the water tank, and the water replenishing pump stops working until the liquid level returns to normal; if the liquid level of the waste heat storage water tank of the quenching tank is normal, the waste heat recovery utilization controller of the quenching tank judges the upper limit temperature of the waste heat storage water tank of the quenching tank, the upper limit temperature is reached, the waste heat storage water tank of the quenching tank cannot store heat, and a waste heat recovery circulating pump and a waste heat recovery electromagnetic valve are closed; the temperature of the waste heat storage water tank of the quenching tank is lower than the lower limit, the waste heat recovery utilization controller of the quenching tank judges the temperature range of the quenching tank, if the temperature is lower than the set temperature, the quenching tank is free from waste heat, and the waste heat recovery circulating pump and the waste heat recovery electromagnetic valve are closed; if the real-time temperature of the quenching tank is higher than the set value, the waste heat recycling controller of the quenching tank starts a waste heat recycling pump, and the waste heat storage water tank of the quenching tank starts to store heat; the waste heat recycling controller of the quenching tank continuously judges the temperature range of the machine and cleaning water tank, if the water temperature of the machine and cleaning water tank is lower than the set temperature of the cleaning process, the controller starts the machine and waste heat recycling circulating pump to heat the machine and cleaning water tank until the temperature is higher than the set temperature of the cleaning process; when the water temperature of the cleaning water tank is higher than the set temperature, the controller closes the machine-added waste heat utilization circulating pump and the waste heat utilization electromagnetic valve, and opens the auxiliary waste heat utilization circulating pump and the auxiliary waste heat utilization electromagnetic valve to supply heat to the auxiliary equipment water tank; meanwhile, the controller monitors the temperature of the machine and cleaning water tank in real time, and when the temperature is lower than the set temperature of the machine and cleaning, the machine and waste heat utilization circulating pump is started again; setting the heating time of the machine washing water tank, and if the temperature of the machine washing water reaches or is higher than the washing set temperature in the set time, controlling the system to start the auxiliary waste heat utilization circulating pump all the time; if the cleaning water tank can not reach the cleaning temperature within the set time, the control system closes the auxiliary waste heat utilization circulating pump, and the auxiliary waste heat utilization circulating pump is specially used for supplying heat to the machining cleaning water tank until the temperature is higher than the set temperature for machining cleaning, stops supplying heat, and supplies heat to auxiliary facilities again.
Compared with the prior art, the beneficial effects of the utility model are that: the waste heat recycling controller controls the waste heat recycling circulating pump to transfer heat collected by the waste heat recycling heat exchanger to the waste heat storage water tank of the quenching tank, the control machine controls the waste heat recycling circulating pump to transfer heat in the waste heat storage water tank of the quenching tank to the mechanical waste heat recycling heat exchanger, and the heating machine adds cleaning water; the waste heat recycling controller controls the auxiliary waste heat recycling circulating pump to transfer heat in the heat storage water tank to the auxiliary waste heat recycling heat exchanger to heat water for auxiliary facilities; monitoring the liquid level of the water tank in real time, and if the liquid level is reduced, starting a water replenishing pump by the waste heat recovery controller to replenish water for the water tank; the quenching tank waste heat recycling system can collect a large amount of waste heat generated by a heat treatment process in the hub manufacturing process, and transmits the collected high-quality heat energy to a hub machining cleaning process and auxiliary facilities for heat supply, so that the purposes of energy recycling, cost reduction and efficiency improvement are achieved.
Drawings
FIG. 1 is a schematic view of a waste heat recycling system of a quenching tank of the present invention;
FIG. 2 is a control flow chart of a waste heat recycling system of the quenching tank;
FIG. 3 is a logic control diagram of a waste heat recycling system of the quenching tank;
reference numerals: 1-quenching tank; 2-a waste heat recovery heat exchanger; 3-a waste heat recovery circulating pump; 4-a waste heat recovery electromagnetic valve; 5-a stop valve; 6-water replenishing pump; 7-a waste heat storage water tank of the quenching tank; 8-mechanically adding a waste heat utilization circulating pump; 9-electromagnetic valve for utilizing waste heat; 10-auxiliary waste heat utilization circulating pump; 11-auxiliary waste heat utilization electromagnetic valve; 12-mechanically adding a waste heat utilization heat exchanger; 13-adding a cleaning water tank; 14-auxiliary waste heat utilization heat exchanger; 15-auxiliary water tank.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
As shown in fig. 1, the utility model discloses a quenching tank waste heat recovery system of recycling, including quenching tank 1, waste heat recovery heat exchanger 2, waste heat recovery circulating pump 3, machine adds waste heat utilization heat exchanger 12, machine adds waste heat utilization circulating pump 8, quenching tank waste heat storage water tank 7 and moisturizing pump 6, waste heat recovery heat exchanger 2 installs in quenching tank 1, waste heat recovery circulating pump 3 is waste heat recovery heat exchanger 2 from quenching tank waste heat storage water tank 7 internal pumping circulating water, waste heat recovery solenoid valve 4 installs on the waste heat recovery wet return between waste heat recovery heat exchanger 2 and quenching tank waste heat storage water tank 7, waste heat recovery heat exchanger 2 collects the waste heat that produces in the wheel hub heat treatment process, waste heat recovery circulating water conveys the heat treatment process high-quality waste heat energy source in quenching tank 1 to quenching tank waste heat storage water tank 7; the machine-added waste heat utilization heat exchanger 12 is installed in a machine-added cleaning water tank 13, a machine-added waste heat utilization circulating pump 8 pumps circulating water for the machine-added waste heat utilization heat exchanger 12 from the quenching tank waste heat storage water tank 7, a waste heat utilization electromagnetic valve 9 is installed on a machine-added waste heat utilization water return pipeline between the machine-added waste heat utilization heat exchanger 12 and the quenching tank waste heat storage water tank 7, and the machine-added waste heat utilization circulating water transfers heat in the quenching tank waste heat storage water tank 7 to the machine-added cleaning water tank 13 to provide cleaning hot water for the hub machining; the water replenishing pump 6 is connected with the quenching tank waste heat storage water tank 7 through a pipeline, and the stop valve 5 controls the water replenishing pump 6 to replenish water for the quenching tank waste heat storage water tank 7.
As the utility model discloses a quenching groove waste heat recovery system of recycling's a concrete implementation mode still includes supplementary waste heat utilization heat exchanger 14 and supplementary waste heat utilization circulating pump 10, supplementary waste heat utilization heat exchanger 14 is installed in auxiliary water tank 15, and supplementary waste heat utilization circulating pump 10 is supplementary waste heat utilization heat exchanger 14 from the internal pumping circulating water of quenching groove waste heat storage water tank 7, and supplementary waste heat utilization solenoid valve 11 is installed on supplementary waste heat utilization wet return between supplementary waste heat utilization heat exchanger 14 and the quenching groove waste heat storage water tank 7, and supplementary waste heat circulating water conveys the heat in quenching groove waste heat storage water tank 7 to auxiliary facilities water tank 15 in, provides the heat for auxiliary facilities heat supply.
As a specific implementation manner of the quenching tank waste heat recycling system of the utility model, as shown in fig. 2, the quenching tank waste heat recycling system further comprises a waste heat recycling controller, the quenching tank waste heat recycling controller communicates with a factory energy recycling comprehensive platform, the quenching tank heat treatment process waste heat recycling substation serving as the comprehensive control platform, a first temperature sensor is arranged in the quenching tank 1, a second temperature sensor is arranged in the machining cleaning water tank 13, a third liquid level sensor and a third temperature sensor are arranged in the quenching tank waste heat storage water tank 7, the waste heat recycling circulating pump 3, the waste heat recycling electromagnetic valve 4, the water replenishing pump 6, the machining waste heat recycling circulating pump 8, the waste heat recycling electromagnetic valve 9, the auxiliary waste heat recycling circulating pump 10, the auxiliary waste heat recycling electromagnetic valve 11, the first temperature sensor, the second temperature sensor, the liquid level sensor and the third temperature sensor are in signal connection with the waste heat recycling controller, the waste heat recycling controller receives temperature signals of the quenching tank 1 and the mechanical heating cleaning water tank 13 and liquid level and temperature signals of the waste heat storage water tank 7 of the quenching tank, and intelligently controls the waste heat recycling circulating pump 3, the waste heat recycling electromagnetic valve 4, the water replenishing pump 6, the mechanical heating waste heat recycling circulating pump 8, the waste heat utilizing electromagnetic valve 9, the auxiliary waste heat recycling circulating pump 10 and the auxiliary waste heat utilizing electromagnetic valve 11 through analysis and logic judgment, so that the waste heat recycling function of the heat treatment process of the quenching tank is realized.
The utility model discloses a control method that quenches groove waste heat recovery and recycle, its logic control chart is shown in fig. 3, and the system is at the beginning of operation, quenches groove waste heat recovery and utilizes controller analysis to quench the liquid level signal of groove waste heat storage water tank 7, and the liquid level of quenching groove waste heat storage water tank 7 reduces, then controls moisturizing pump 6 and starts, for the water tank moisturizing, until the liquid level resumes normally, moisturizing pump 6 stop work. The liquid level of the quenching tank waste heat storage water tank 7 is normal, the quenching tank waste heat recovery utilization controller judges the upper limit temperature of the quenching tank waste heat storage water tank 7, the upper limit temperature is reached, the quenching tank waste heat storage water tank 7 cannot store heat, and the waste heat recovery circulating pump 3 and the waste heat recovery electromagnetic valve 4 are closed; preferably, the upper limit temperature is set to 80 ℃, the temperature of the quenching tank waste heat storage water tank 7 is lower than the upper limit, the quenching tank waste heat recovery utilization controller judges the temperature range of the quenching tank 1, if the temperature is lower than the set temperature, the quenching tank 1 is free from waste heat, the waste heat recovery circulating pump 3 and the waste heat recovery electromagnetic valve 4 are closed, and preferably, the set temperature is 80 ℃. If the real-time temperature of the quenching tank 1 is higher than the set value, the quenching tank waste heat recycling controller starts the waste heat recycling pump 3, and the quenching tank waste heat storage water tank 7 starts to store heat. The waste heat recycling controller of the quenching tank continuously judges the temperature range of the machine and cleaning water tank 13, if the water temperature of the machine and cleaning water tank 13 is lower than the set temperature of the cleaning process, the controller starts the machine and waste heat recycling circulating pump 8 to heat the cleaning water tank 13 until the temperature is higher than the set temperature of the cleaning process, and preferably, the set temperature of the cleaning process is 60 ℃. When the water temperature of the cleaning water tank 13 is higher than the set temperature, the controller closes the machine-added waste heat utilization circulating pump 8 and the waste heat utilization electromagnetic valve 9, and opens the auxiliary waste heat utilization circulating pump 10 and the auxiliary waste heat utilization electromagnetic valve 11 to supply heat to the auxiliary equipment water tank 15. Meanwhile, the controller monitors the temperature of the machine-adding cleaning water tank 13 in real time, and when the temperature is lower than the set temperature of the machine-adding cleaning again, the machine-adding waste heat utilization circulating pump 8 is started again. Setting the heating time of the machine washing water tank 13, and if the temperature of the machine washing water reaches or is higher than the washing set temperature in the set time, the control system always starts the auxiliary waste heat utilization circulating pump 10; if the cleaning water tank can not reach the cleaning temperature within the set time, the control system turns off the auxiliary waste heat utilization circulating pump 10, and specially supplies heat to the machining cleaning water tank 13 until the temperature is higher than the machining cleaning set temperature, stops supplying heat, and supplies heat to the auxiliary facilities again, wherein the heating set time of the cleaning water tank 13 is preferably 20 min.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (3)
1. A quenching tank waste heat recovery and recycling system is characterized by comprising a quenching tank (1), a waste heat recovery heat exchanger (2), a waste heat recovery circulating pump (3), a machine-added waste heat utilization heat exchanger (12), a machine-added waste heat utilization circulating pump (8), a quenching tank waste heat storage water tank (7) and a water supplementing pump (6), wherein the waste heat recovery heat exchanger (2) is arranged in the quenching tank (1), the waste heat recovery circulating pump (3) pumps circulating water from the quenching tank waste heat storage water tank (7) for the waste heat recovery heat exchanger (2), a waste heat recovery electromagnetic valve (4) is arranged on a waste heat recovery heat storage water return pipeline between the waste heat recovery heat exchanger (2) and the quenching tank waste heat storage water tank (7), the machine-added waste heat utilization heat exchanger (12) is arranged in a machine-added cleaning water tank (13), the machine-added waste heat utilization circulating pump (8) pumps circulating water from the quenching tank waste heat storage water tank (7) for the machine-added waste, the waste heat utilization electromagnetic valve (9) is arranged on a machine-heating waste heat utilization water return pipeline between the machine-heating waste heat utilization heat exchanger (12) and the quenching tank waste heat storage water tank (7), and the water supplementing pump (6) is connected with the quenching tank waste heat storage water tank (7) through a pipeline.
2. The quenching tank waste heat recycling system of claim 1, further comprising an auxiliary waste heat utilization heat exchanger (14) and an auxiliary waste heat utilization circulation pump (10), wherein the auxiliary waste heat utilization heat exchanger (14) is installed in an auxiliary water tank (15), the auxiliary waste heat utilization circulation pump (10) pumps circulating water from the quenching tank waste heat storage water tank (7) for the auxiliary waste heat utilization heat exchanger (14), and the auxiliary waste heat utilization electromagnetic valve (11) is installed on an auxiliary waste heat utilization water return line between the auxiliary waste heat utilization heat exchanger (14) and the quenching tank waste heat storage water tank (7).
3. The system of claim 2, further comprising a heat recovery and reuse controller, wherein a first temperature sensor is disposed in the quenching tank (1), a second temperature sensor is disposed in the machine-added cleaning water tank (13), a third liquid level sensor and a third temperature sensor are disposed in the heat storage water tank (7), and the heat recovery circulating pump (3), the heat recovery solenoid valve (4), the water replenishing pump (6), the machine-added heat utilization circulating pump (8), the heat utilization solenoid valve (9), the auxiliary heat utilization circulating pump (10), the auxiliary heat utilization solenoid valve (11), the first temperature sensor, the second temperature sensor, the liquid level sensor and the third temperature sensor are in signal connection with the heat recovery and reuse controller.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202020922006.5U CN213232394U (en) | 2020-05-27 | 2020-05-27 | Quenching groove waste heat recovery system of recycling |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202020922006.5U CN213232394U (en) | 2020-05-27 | 2020-05-27 | Quenching groove waste heat recovery system of recycling |
Publications (1)
Publication Number | Publication Date |
---|---|
CN213232394U true CN213232394U (en) | 2021-05-18 |
Family
ID=75867837
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202020922006.5U Withdrawn - After Issue CN213232394U (en) | 2020-05-27 | 2020-05-27 | Quenching groove waste heat recovery system of recycling |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN213232394U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111485079A (en) * | 2020-05-27 | 2020-08-04 | 秦皇岛信能能源设备有限公司 | Quenching tank waste heat recycling system and control method |
-
2020
- 2020-05-27 CN CN202020922006.5U patent/CN213232394U/en not_active Withdrawn - After Issue
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111485079A (en) * | 2020-05-27 | 2020-08-04 | 秦皇岛信能能源设备有限公司 | Quenching tank waste heat recycling system and control method |
CN111485079B (en) * | 2020-05-27 | 2023-09-08 | 秦皇岛信能能源设备有限公司 | Quenching tank waste heat recycling system and control method |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN111485079B (en) | Quenching tank waste heat recycling system and control method | |
CN203998973U (en) | Polycrystalline silicon reducing furnace heat energy utilization system | |
CN213232394U (en) | Quenching groove waste heat recovery system of recycling | |
CN105674373A (en) | High area and low area combined water mixing heat supply system | |
CN202598678U (en) | Intelligent adaptive control system for heat exchanger unit | |
CN102221237A (en) | Hot water supply device and method, and manufacturing and hot water supply control method thereof | |
CN104279788A (en) | Process system capable of utilizing waste heat and complementary energy of cooling water of blast furnace | |
CN201561493U (en) | Solar energy heat pump composite hot water system for bathroom | |
CN206131469U (en) | Utilize renewable energy circulation to prepare life hot -water heating system | |
CN211500973U (en) | Waste heat recycling system of screw air compressor | |
CN217482498U (en) | Heating system applied to wind power lubricating system | |
CN207179768U (en) | The heating of plate type solar low temperature, domestic hot-water's energy conserving system | |
CN213062183U (en) | Circulating glass daylighting top spray cooling device and system driven by solar energy | |
CN207655754U (en) | Automobile stamping heat recovery system | |
CN111189221A (en) | Hot water heating system and control method thereof | |
CN107726422B (en) | Pore groundwater circulation heating system of solar energy auxiliary water source heat pump | |
CN207540122U (en) | A kind of residual heat of air compressor recycles supplying hot water circulating water saving system | |
CN203771510U (en) | Heating water supplementation system of power plant | |
CN211781962U (en) | Hot water heating system | |
CN206755330U (en) | Combustion gas distributed busbar protection recirculated water utilization system | |
CN106196627B (en) | Split type hot water supply system for campus | |
JP2008121936A (en) | Cogeneration system | |
CN205505148U (en) | Water heating system is mixed to high district, low district pair | |
CN220852662U (en) | Cold and hot water circulation system for emulsification workshop | |
CN104848353A (en) | Solar domestic hot water heating circulation supply system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
GR01 | Patent grant | ||
GR01 | Patent grant | ||
AV01 | Patent right actively abandoned | ||
AV01 | Patent right actively abandoned | ||
AV01 | Patent right actively abandoned |
Granted publication date: 20210518 Effective date of abandoning: 20230908 |
|
AV01 | Patent right actively abandoned |
Granted publication date: 20210518 Effective date of abandoning: 20230908 |