CN211623600U - Small-size horizontal hydroelectric set state monitoring device based on radio frequency identification technology - Google Patents
Small-size horizontal hydroelectric set state monitoring device based on radio frequency identification technology Download PDFInfo
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- CN211623600U CN211623600U CN201921992937.6U CN201921992937U CN211623600U CN 211623600 U CN211623600 U CN 211623600U CN 201921992937 U CN201921992937 U CN 201921992937U CN 211623600 U CN211623600 U CN 211623600U
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Abstract
The utility model relates to a small-size horizontal hydroelectric set state monitoring device based on radio frequency identification technology, include: the wireless radio frequency identification tag is arranged at the monitoring part of the small horizontal water turbine generator set and is used for acquiring the operation parameters of each monitoring part of the set in real time; the operation parameters comprise vibration, pressure pulsation, rotating speed, swing degree and temperature; the edge calculation unit is used for receiving the operation parameter data and obtaining physical quantity data corresponding to the operation parameters through data processing; and the monitoring terminal is used for receiving the physical quantity data and carrying out state monitoring on the small horizontal water turbine generator set based on the physical quantity data. The utility model discloses a RFID radio frequency identification label, the expansibility is good, effective management, the real-time nature is strong, the installation is simple, non-maintaining, can realize the control to unit running state.
Description
Technical Field
The utility model belongs to the technical field of water conservancy water and electricity, especially, relate to a small-size horizontal hydroelectric set state monitoring device based on radio frequency identification technology.
Background
At present, large and medium hydropower station hydroelectric generating sets are all designed and provided with state online monitoring systems, and the state online monitoring systems are used for measuring and monitoring process quantity parameters, stability parameters and the like in the running process of the hydroelectric generating sets, such as the rotating speed, power, temperature, vibration, swing, pressure pulsation, air clearance and the like of the hydroelectric generating sets, so that the state online monitoring systems become important ways for rapidly acquiring the running state of the hydroelectric generating sets and searching fault reasons.
The traditional on-line monitoring system is generally in a wired transmission mode and comprises a sensor unit, a data acquisition unit and an upper computer unit. However, the online state monitoring device of the hydroelectric generating set is less applied to small hydroelectric generating sets. The small hydroelectric generating set has the advantages that the number of operation maintenance personnel and the technical level of the small hydroelectric generating set are large, the medium-sized generating set is low, the state parameters of equipment in operation can not be obtained in real time, the safe and stable operation of the generating set is not facilitated, and the labor intensity of the operation maintenance personnel is increased. Therefore, a real-time online monitoring scheme for the state of the small hydropower station unit is needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a small-size horizontal hydraulic generator set state monitoring devices based on radio frequency identification technology, through installing Radio Frequency Identification (RFID) label at each position of hydraulic generator set, gather the vibration of unit in real time, pressure pulsation, the rotational speed, the throw, operating parameter such as temperature, transmit data to unit edge computing unit through wireless transmission mode again and carry out data analysis and storage, edge computing unit both can be through the long-range customer end of optical fiber connection, also can connect the mobile receiving unit through the bluetooth, finally realize that long-range data looks over, operation such as management, realize the control to unit running state, when monitoring parameter surpasss the alarm value, send alarm signal in real time.
The utility model provides a small-size horizontal hydroelectric set state monitoring device based on radio frequency identification technology, include:
the wireless radio frequency identification tag is arranged at the monitoring part of the small horizontal water turbine generator set and is used for acquiring the operation parameters of each monitoring part of the set in real time; the operation parameters comprise vibration, pressure pulsation, rotating speed, swing degree and temperature;
the edge calculation unit is used for receiving the operation parameter data and obtaining physical quantity data corresponding to the operation parameters through data processing;
and the monitoring terminal is used for receiving the physical quantity data and carrying out state monitoring on the small horizontal water turbine generator set based on the physical quantity data.
Further, the monitoring terminal is a remote client, and the edge computing unit is connected with the remote client through an optical fiber.
Furthermore, the monitoring terminal is a mobile receiving unit, and the edge calculating unit is connected with the mobile receiving unit through a wireless transmission module.
Further, the radio frequency identification tag includes: the system comprises a rotating speed and swing measuring label, a bearing vibration measuring label, a top cover vibration measuring label, a generator stator frame vibration label, a generator stator vibration and temperature measuring label and a draft tube pressure pulsation and vibration measuring label;
the rotating speed and swing degree measuring label is a non-contact integrated label and is arranged near the rotating part; the generator stator vibration and temperature measurement tag is an integrated tag arranged on a stator shell;
stator temperature measurement labels in generator stator vibration and temperature measurement labels adopt passive labels, and other labels adopt active labels.
Furthermore, the generator stator vibration and temperature measurement tag is fixedly arranged at the position of a generator stator iron core, a speed sensor and a temperature sensor are arranged in the generator stator vibration and temperature measurement tag, and are used for measuring the temperature and vibration value of the stator iron core and monitoring the running state of the stator through the temperature and vibration value;
the generator stator frame vibration tag is fixedly arranged on the upper plane and the vertical plane of the generator stator frame, a speed sensor is arranged in the generator stator frame vibration tag, and is used for measuring the horizontal vibration value and the vertical vibration value of the stator frame and monitoring the running state of the generator through the frame vibration value;
the bearing vibration measurement tag is fixedly arranged on the upper plane and the vertical plane of the bearing frame, a speed sensor is arranged in the bearing vibration measurement tag, and is used for measuring the horizontal vibration value and the vertical vibration value of the bearing frame and monitoring the running state of the part through the bearing vibration value;
the bearing temperature measuring label is fixedly arranged on the upper plane of the bearing frame, is connected with a temperature sensor arranged in the bearing through a cable and is used for measuring the bearing bush temperature value and monitoring the running state of the unit through the bearing temperature value;
the top cover vibration measurement label is fixedly arranged on the top cover rack close to the large shaft, a speed sensor is arranged in the top cover rack and used for measuring the horizontal vibration value and the vertical vibration value of the top cover, and the internal running state of the water turbine is monitored through the top cover vibration value;
the pressure pulsation and vibration measurement tag of the draft tube is fixedly arranged on the outer surface of the draft tube, a speed sensor and a pressure pulsation sensor are arranged in the draft tube, the pressure pulsation sensor is communicated with an opening on the draft tube and is used for measuring the vibration and pressure pulsation values of the draft tube, and the internal operation state of the water turbine is monitored through the pressure pulsation and vibration values of the draft tube;
the rotating speed and swing degree measuring label is fixedly arranged on a support below each guide bearing, is used for non-contact measurement, is internally provided with an eddy current sensor, is fixed on the support, is provided with two measuring points which form a 90-degree angle with each other, is radially arranged, has a distance of 2-3 mm with a large rotating shaft, is used for measuring swing degree values and rotating speed values of different parts of a rotating component, and monitors the axis state of the unit through the swing degree values.
Further, the remote client communicates with the edge computing unit through a TCP/IP Ethernet.
Furthermore, the edge computing unit is a programmable automation controller and comprises an MCU controller, and an RFID reader, a state display module, an IO module, a Bluetooth module, an uplink communication module and a power management module which are connected with the MCU controller.
Furthermore, the edge calculation unit is installed in the plant building and is located in the same space with the generator set.
Further, the mobile receiving unit is a smart phone or a tablet computer.
Further, the wireless transmission module is a bluetooth module or a WIFI module.
By means of the scheme, the small horizontal type hydraulic generator set state monitoring device based on the radio frequency identification technology can accurately measure and analyze the frame vibration, the large shaft throw, the pressure pulsation, the bearing temperature and the working condition parameters of the small horizontal type hydraulic generator set, can perform various conventional stability tests, transitional tests and other related performance tests, is high in accuracy, convenient and fast, can accurately and fast obtain the running state of the hydraulic generator set, provides real-time information for daily running of a power station, and provides direct basis for solving the set characteristics and finding fault reasons.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic view of the RFID tag of the present invention;
fig. 3 is a schematic diagram of data transmission between the edge computing unit and the rfid tag of the present invention.
Reference numbers in the figures:
1-a small horizontal hydroelectric generating set; 2-an edge calculation unit; 3-a mobile receiving unit; 4-a remote client;
5. a guide bearing of the small horizontal hydroelectric generating set; 6-a draft tube; 7-a rotating wheel; 8-a volute; 9-a top cover; 10-large axis;
11. a combination bearing; 12-a generator; 13-rotation speed and swing measurement label; 14-bearing vibration measurement tag; 15-a cap vibration measurement tag; 16-generator stator frame vibration signature; 17-generator stator vibration and temperature measurement tag; 18-draft tube pressure pulsation and vibration measurement label, 19-bearing temperature measurement label.
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.
Referring to fig. 1, the present embodiment provides a state monitoring device for a small horizontal water turbine generator set based on a radio frequency identification technology, which includes:
the system comprises a wireless Radio Frequency Identification (RFID) tag 1, a wireless communication module and a wireless communication module, wherein the wireless Radio Frequency Identification (RFID) tag 1 is arranged at a monitoring part of a small horizontal water turbine generator set and is used for acquiring the operation parameters of each monitoring part of the set in real time; the operation parameters comprise vibration, pressure pulsation, rotating speed, swing degree and temperature;
the edge calculation unit 2 is used for receiving the operation parameter data and obtaining physical quantity data corresponding to the operation parameters through data processing;
and the monitoring terminal is used for receiving the physical quantity data and carrying out state monitoring on the small horizontal water turbine generator set based on the physical quantity data.
This hydroelectric set state monitoring device, the RFID label is installed on small-size hydroelectric set 1, the unit is in operation, various information (hydroelectric set guide bearing, draft tube, runner, spiral case, top cap, macroaxis, combination bearing's temperature, pressure pulsation, rotational speed, throw, vibration etc. local data) that the RFID label gathered send the edge calculation unit through the mode of radio frequency technology, the edge calculation unit can realize looking over the data at the scene after collecting and analyzing the data, also can look over through monitoring terminal. The method can accurately measure and analyze the frame vibration, the large shaft throw, the pressure pulsation, the bearing temperature and the working condition parameters of the small horizontal type hydroelectric generating set, can perform various conventional stability tests, transitional tests and other related performance tests, has high accuracy, is convenient and quick, can accurately and quickly obtain the running state of the hydroelectric generating set, provides real-time information for the daily running of a power station, and provides a direct basis for solving the set characteristics and finding fault reasons.
This RFID label (sensor) that uses among hydroelectric set state monitoring device has following characteristics:
1) the expansibility is good:
the RFID tag is installed in an off-line mode, network layout is not restricted by distance and power supplies, expansion is facilitated, data transmission can be achieved by connecting cables, frequency is high, and transmission is fast.
2) And (3) effective management:
each RFID tag operates independently, and different unit data is provided with a specific ID number in order to provide effective management. Meanwhile, the data processing terminal can also transmit data through a local area network and a wide area network, and workers can monitor data uploaded by the terminal on the cloud platform in real time.
3) The real-time performance is strong:
the device can be used for online measurement, can monitor the parameter change of equipment in real time, is identified in a non-contact manner, and has extremely high reading speed; the real-time alarm can be realized, and early warning can be performed in advance according to the data change trend, so that the accident expansion is avoided.
4) The installation is simple: the sensor is small in size, is in wireless connection with the collector, and is flexible and convenient to install and wire.
5) Maintenance-free:
the sensor chip is made of quartz semiconductor material, has stable physical and chemical properties and long service life, and reduces the manufacturing cost of the system.
In this embodiment, the monitoring terminal may adopt a remote client 4, and the edge computing unit 2 is connected with the remote client 4 through an optical fiber. The edge computing unit 2 can transmit data to the remote client 4 through the optical fiber, and remote data viewing and analysis are achieved.
In this embodiment, the monitoring terminal may further employ a mobile receiving unit 3, and the edge calculating unit 2 is connected to the mobile receiving unit 3 through a wireless transmission module. The mobile receiving unit 3 may be a smartphone or a tablet computer. The wireless transmission module can adopt a Bluetooth module or a WIFI module. On edge calculation unit 2 passes through wireless bluetooth or WIFI with data transmission to mobile receiving unit 3, install APP on the mobile receiving unit, can realize looking over, downloading and the analysis to data.
In this embodiment, the rfid tag includes: a rotating speed and swing measuring label 13, a bearing vibration measuring label 14, a top cover vibration measuring label 15, a generator stator frame vibration label 16, a generator stator vibration and temperature measuring label 17, a draft tube pressure pulsation and vibration measuring label 18 and a bearing temperature measuring label 19;
the rotating speed and swing measuring label 13 is a non-contact integrated label and is arranged near the rotating part; the generator stator vibration and temperature measurement label 17 is an integrated label arranged on a stator shell, and the bearing temperature measurement label 19 is a split label arranged on the upper part of a bearing and connected with an internal temperature sensor;
the RFID tag can measure single physical quantities such as unit vibration, swing, rotating speed, pressure pulsation, temperature and the like or two or more physical quantities according to different measurement requirements. The system mainly realizes the functions of collecting, temporarily storing and wirelessly transmitting field data (switching value, analog quantity, alarm information, event record and ID value). The RFID label has strong environmental adaptability, IP65 protection grade, working environment temperature range of-40- +85, strong anti-interference capability, low power consumption, small volume and convenient installation, and can be provided with a built-in wide-temperature battery (working for more than two years continuously).
In the embodiment, the Radio Frequency Identification (RFID) tag includes a passive tag and an active tag, the temperature of the stator is generally collected in a passive wireless manner, and other physical quantities can be collected in an active wireless manner. The passive tag can be used for measuring the temperature of a stator of the generator, the temperature of a coil bar, the temperature of a bearing and the like; the active label is internally provided with a battery and can be used for measuring bearing vibration, unit swing, pressure pulsation and bearing temperature, the label comprises a speed sensor, an eddy current sensor, a pressure pulsation sensor, a temperature sensor and the like for measurement, wireless transmission to an edge calculation unit can be realized for acquisition amount through an RFID technology, and the edge calculation unit can process acquisition information and then transmit the acquisition information to a remote client through a wire or transmit the acquisition information to a mobile data acquisition end through a wireless way.
Referring to fig. 2, a generator stator vibration and temperature measurement tag 17 is fixedly installed at a position of a generator stator core, a speed sensor and a temperature sensor are arranged in the generator stator vibration and temperature measurement tag, and are used for measuring the temperature and vibration value of the stator core and monitoring the running state of the stator through the temperature and vibration value;
the generator stator frame vibration tag 16 is fixedly arranged on the upper plane and the vertical plane of the generator stator frame, a speed sensor is arranged in the generator stator frame vibration tag, and is used for measuring the horizontal vibration and the vertical vibration values of the stator frame and monitoring the running state of the generator through the frame vibration values;
the bearing vibration measurement tag 14 is fixedly arranged on the upper plane and the vertical plane of the bearing frame, is internally provided with a speed sensor and is used for measuring the horizontal vibration and the vertical vibration values of the bearing frame and monitoring the running state of the part through the vibration value of the bearing;
the bearing temperature measuring label 19 is fixedly arranged on the upper plane of the bearing frame, is connected with a temperature sensor arranged in the bearing through a cable and is used for measuring the bearing bush temperature (oil temperature) value and monitoring the running state of the unit through the bearing temperature value;
the top cover vibration measurement label 15 is fixedly arranged on the frame of the top cover 9 and close to the large shaft 10, a speed sensor is arranged in the top cover vibration measurement label for measuring the horizontal vibration and vertical vibration values of the top cover, and the internal running state of the water turbine is monitored through the top cover vibration values;
the draft tube pressure pulsation and vibration measurement tag 18 is fixedly arranged on the outer surface of the draft tube 6, a speed sensor and a pressure pulsation sensor are arranged in the draft tube, the pressure pulsation sensor is communicated with an opening on the draft tube and is used for measuring the vibration and pressure pulsation values of the draft tube, and the internal operation state of the water turbine is monitored through the pressure pulsation and vibration values of the draft tube;
the rotating speed and swing measuring tag 13 is fixedly arranged on a support below each small horizontal type hydroelectric generating set guide bearing 5, is used for non-contact measurement, is internally provided with an eddy current sensor, is fixed on the support, is provided with two measuring points which form an angle of 90 degrees with each other, is radially arranged, has a distance of 2-3 mm with a rotating large shaft, is used for measuring swing values and rotating speed values of different parts of a rotating component, and monitors the axial state of the generating set through the swing values.
In this embodiment, the remote client 4 performs communication transmission with the edge computing unit 2 through a TCP/IP ethernet network, and monitors, manages, and analyzes the vibration, the swing, the pressure pulsation, the rotation speed, and the related operating condition parameters of the hydroelectric generating set.
Referring to fig. 3, various RFID tags are installed inside the small horizontal water turbine generator set 1, and the edge computing unit 2 is a Programmable Automation Controller (PAC) and includes an MCU controller, and an RFID reader, a status display module, an IO module, a bluetooth module, an uplink communication module, and a power management module connected to the MCU controller, so as to collect, arrange, and transmit data. The edge calculation unit 2 firstly receives the data wirelessly transmitted by the RFID tag, then processes the data, counts and analyzes the running state, the running time, the abnormity and the fault alarm, and completes the state monitoring function of the water-turbine generator set.
In this embodiment, the edge calculation unit 2 is installed in the plant building and is located in the same space as the generator set.
The above description is only a preferred embodiment of the present invention, and is not intended to limit 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 (10)
1. The utility model provides a small-size horizontal hydroelectric set state monitoring device based on radio frequency identification technique which characterized in that includes:
the wireless radio frequency identification tag is arranged at the monitoring part of the small horizontal water turbine generator set and is used for acquiring the operation parameters of each monitoring part of the set in real time; the operation parameters comprise vibration, pressure pulsation, rotating speed, swing degree and temperature;
the edge calculation unit is used for receiving the operation parameter data and obtaining physical quantity data corresponding to the operation parameters through data processing;
and the monitoring terminal is used for receiving the physical quantity data and carrying out state monitoring on the small horizontal water turbine generator set based on the physical quantity data.
2. The small horizontal water turbine generator set state monitoring device based on the radio frequency identification technology as claimed in claim 1, wherein the monitoring terminal is a remote client, and the edge calculation unit is connected with the remote client through an optical fiber.
3. The device for monitoring the state of the small horizontal water turbine generator set based on the radio frequency identification technology according to claim 1, wherein the monitoring terminal is a mobile receiving unit, and the edge calculating unit is connected with the mobile receiving unit through a wireless transmission module.
4. The small horizontal water turbine generator set state monitoring device based on the radio frequency identification technology as claimed in claim 1, wherein the radio frequency identification tag comprises: the system comprises a rotating speed and swing measuring label, a bearing vibration measuring label, a top cover vibration measuring label, a generator stator frame vibration label, a generator stator vibration and temperature measuring label, a draft tube pressure pulsation and vibration measuring label and a bearing temperature measuring label;
the rotating speed and swing degree measuring label is a non-contact integrated label and is arranged near the rotating part; the generator stator vibration and temperature measurement tag is an integrated tag arranged on a stator shell;
stator temperature measurement labels in generator stator vibration and temperature measurement labels adopt passive labels, and other labels adopt active labels.
5. The device for monitoring the state of the small horizontal water turbine generator set based on the radio frequency identification technology according to claim 4, wherein the generator stator vibration and temperature measurement tag is fixedly arranged at the position of a generator stator iron core, a speed sensor and a temperature sensor are arranged in the device for measuring the temperature and the vibration value of the stator iron core, and the running state of the stator is monitored through the temperature and the vibration value;
the generator stator frame vibration tag is fixedly arranged on the upper plane and the vertical plane of the generator stator frame, a speed sensor is arranged in the generator stator frame vibration tag, and is used for measuring the horizontal vibration value and the vertical vibration value of the stator frame and monitoring the running state of the generator through the frame vibration value;
the bearing vibration measurement tag is fixedly arranged on the upper plane and the vertical plane of the bearing frame, a speed sensor is arranged in the bearing vibration measurement tag, and is used for measuring the horizontal vibration value and the vertical vibration value of the bearing frame and monitoring the running state of the part through the bearing vibration value;
the bearing temperature measuring label is fixedly arranged on the upper plane of the bearing frame, is connected with a temperature sensor arranged in the bearing through a cable and is used for measuring the bearing bush temperature value and monitoring the running state of the unit through the bearing temperature value;
the top cover vibration measurement label is fixedly arranged on the top cover rack close to the large shaft, a speed sensor is arranged in the top cover rack and used for measuring the horizontal vibration value and the vertical vibration value of the top cover, and the internal running state of the water turbine is monitored through the top cover vibration value;
the pressure pulsation and vibration measurement tag of the draft tube is fixedly arranged on the outer surface of the draft tube, a speed sensor and a pressure pulsation sensor are arranged in the draft tube, the pressure pulsation sensor is communicated with an opening on the draft tube and is used for measuring the vibration and pressure pulsation values of the draft tube, and the internal operation state of the water turbine is monitored through the pressure pulsation and vibration values of the draft tube;
the rotating speed and swing degree measuring label is fixedly arranged on a support below each guide bearing, is used for non-contact measurement, is internally provided with an eddy current sensor, is fixed on the support, is provided with two measuring points which form a 90-degree angle with each other, is radially arranged, has a distance of 2-3 mm with a large rotating shaft, is used for measuring swing degree values and rotating speed values of different parts of a rotating component, and monitors the axis state of the unit through the swing degree values.
6. The small horizontal water turbine generator set state monitoring device based on the radio frequency identification technology as claimed in claim 2, wherein the remote client is in communication transmission with the edge computing unit through a TCP/IP Ethernet.
7. The device for monitoring the state of the small horizontal water turbine generator set based on the radio frequency identification technology according to claim 1, wherein the edge computing unit is a programmable automation controller and comprises an MCU (microprogrammed control unit) controller, and an RFID (radio frequency identification) reader, a state display module, an IO (input/output) module, a Bluetooth module, an uplink communication module and a power management module which are connected with the MCU controller.
8. The device for monitoring the state of the small horizontal water turbine generator set based on the radio frequency identification technology as claimed in claim 7, wherein the edge calculation unit is installed in a plant building and is located in the same space with the generator set.
9. The device for monitoring the state of the small horizontal water turbine generator set based on the radio frequency identification technology according to claim 3, wherein the mobile receiving unit is a smart phone or a tablet computer.
10. The small horizontal water turbine generator set state monitoring device based on the radio frequency identification technology as claimed in claim 3, wherein the wireless transmission module is a Bluetooth module or a WIFI module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921992937.6U CN211623600U (en) | 2019-11-18 | 2019-11-18 | Small-size horizontal hydroelectric set state monitoring device based on radio frequency identification technology |
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| CN201921992937.6U CN211623600U (en) | 2019-11-18 | 2019-11-18 | Small-size horizontal hydroelectric set state monitoring device based on radio frequency identification technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111005831A (en) * | 2019-11-18 | 2020-04-14 | 大唐水电科学技术研究院有限公司 | Small-size horizontal hydroelectric set state monitoring device based on radio frequency identification technology |
| CN113295412A (en) * | 2021-05-26 | 2021-08-24 | 华能澜沧江水电股份有限公司 | Method for detecting reason of unbalanced stress of guide bearing of vertical water turbine generator set |
-
2019
- 2019-11-18 CN CN201921992937.6U patent/CN211623600U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111005831A (en) * | 2019-11-18 | 2020-04-14 | 大唐水电科学技术研究院有限公司 | Small-size horizontal hydroelectric set state monitoring device based on radio frequency identification technology |
| CN113295412A (en) * | 2021-05-26 | 2021-08-24 | 华能澜沧江水电股份有限公司 | Method for detecting reason of unbalanced stress of guide bearing of vertical water turbine generator set |
| CN113295412B (en) * | 2021-05-26 | 2022-10-11 | 华能澜沧江水电股份有限公司 | Method for detecting cause of unbalanced stress of guide bearing of vertical water turbine generator set |
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