CN213086134U - Device for improving fault information judgment accuracy of copper electrolysis polar plate - Google Patents
Device for improving fault information judgment accuracy of copper electrolysis polar plate Download PDFInfo
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- CN213086134U CN213086134U CN201822145950.XU CN201822145950U CN213086134U CN 213086134 U CN213086134 U CN 213086134U CN 201822145950 U CN201822145950 U CN 201822145950U CN 213086134 U CN213086134 U CN 213086134U
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 48
- 239000010949 copper Substances 0.000 title claims abstract description 48
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 41
- 238000002955 isolation Methods 0.000 claims abstract description 28
- 239000000835 fiber Substances 0.000 claims abstract description 8
- 210000004027 cell Anatomy 0.000 description 19
- 238000000034 method Methods 0.000 description 13
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- 238000001931 thermography Methods 0.000 description 11
- 238000004458 analytical method Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000012535 impurity Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000007670 refining Methods 0.000 description 6
- 239000003792 electrolyte Substances 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 210000002287 horizontal cell Anatomy 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
A device for improving the accuracy of judging the fault information of a copper electrolysis polar plate comprises an infrared thermal imager and a central processor (9) which are in information connection with each other, a display (10) in information connection with the central processor, and an alarm (11) connected with the central processor and the display; the infrared thermal imager comprises an anti-magnetic interference isolation cover (3) with an air inlet hole formed in the top and an exhaust hole (6) formed in the side face, a fiber film (5) arranged on the air inlet hole, a high-definition camera (1) which is arranged in the anti-magnetic interference isolation cover, is provided with a built-in micro-processor (2) and has a downward lens, a fan (4) and a temperature measurer (7) which are arranged in the anti-magnetic interference isolation cover; the high-definition camera and the built-in micro processor are connected with the central processor through a network cable (8) or wifi; the fan and the temperature detector are both electrically connected with the central processor. The utility model discloses effectively improved electrolytic polar plate fault information's real-time supervision and the degree of accuracy, be convenient for in time handle the trouble, improve copper electrolysis efficiency.
Description
Technical Field
The utility model relates to an infrared thermal imaging monitoring technology field, concretely relates to adopt infrared thermal imaging monitoring to judge device of copper electrolysis polar plate trouble.
Background
The high-impurity copper concentrate is smelted to produce a high-impurity copper anode plate, and the high-impurity copper anode plate needs further electrolytic refining. In the electrolytic refining process, impurities in a copper anode plate are dissolved or not dissolved and directly fall off in electrolyte, anode mud is produced in the electrolytic refining process and is suspended or semi-suspended in the electrolyte by the precipitation of the impurities of the anode plate, particles are inevitably grown on the surface of a cathode by the disturbance of manual operation of an electrolytic bath surface and the lapse of the electrolytic operation time, and the particles on the surface of the cathode directly contact the surface of the anode when growing long enough along with the further growth of the particles on the surface of the cathode, so that a short circuit is formed, the short circuit causes ineffective power consumption of heating or ablation of the anode plate, and sometimes causes the grown cathode copper on the cathode plate to re-dissolve again, thereby reducing the yield of the cathode copper. In addition, under the influence of skill difference of operators, when the electrode plate is arranged in the tank, the electrode plate is broken, namely, disconnected and not electrified, so that the ineffective operation that the anode plate is not dissolved and cathode copper is not grown on the surface of the cathode plate is caused, and the improvement of the yield of electrolytic cathode copper and the improvement of the operation efficiency are very unfavorable.
At present, the short circuit or open circuit fault of the electrolytic cell production through electrode plate in the domestic copper smelting refining industry is monitored and judged through a manual handheld Gauss instrument, the method has high manual labor intensity, uncontrollable or unreliable manual monitoring also exists, the manual handheld Gauss instrument scans on the electrolytic cell surface, the anode mud on the electrode plate falls off due to treading on the electrode plate, the electrolyte is disturbed, the anode mud is suspended, the settlement or sedimentation effect is poor, the phenomenon of long particles on the surface of cathode copper can be caused, the final cathode copper yield and quality are directly influenced, the occurrence of the fault of the electrolytic electrode plate is further aggravated, and the high-efficiency electrolysis of copper and the improvement of the quality and index of the cathode copper product are not facilitated.
In recent years, few enterprises in the domestic copper smelting and refining industry develop a technology for scanning, imaging and measuring temperature of an electrolytic cell polar plate by using an infrared imager, but only monitoring and judging whether a fault polar plate exists in a certain cell can be realized, accurate analysis and judgment on coordinate information of the fault polar plate cannot be realized, manual scanning, checking and confirmation are still needed to be assisted, the fault polar plate is found out, and accurate judgment on the fault polar plate information is difficult. Therefore, it is necessary for the copper smelting and refining industry to research and develop a device capable of accurately analyzing and judging fault information of the electrolytic plate as soon as possible.
Disclosure of Invention
An object of the utility model is to solve the problem that prior art exists, a device based on infrared thermal imaging carries out accurate judgement to copper electrolysis trough polar plate fault information is provided, in order to realize the real time monitoring analysis to copper electrolysis trough negative pole short circuit or open circuit, accurate analysis fault coordinate position, and in time send fault information, in order to master electrolysis trough production situation in real time, and in time the accuracy is handled the trouble, thereby improve negative pole copper electrolysis efficiency, improve indexes such as output and the quality of negative pole copper in the unit interval.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a device for improving the accuracy of judging fault information of a copper electrolysis polar plate comprises an infrared thermal imager, a central processor in information connection with the infrared thermal imager, a display in information connection with the central processor, and an alarm connected with the central processor and the display; the infrared thermal imager comprises an anti-magnetic interference isolation cover, a fiber film, a high-definition camera, a fan and a temperature detector, wherein the top of the anti-magnetic interference isolation cover is provided with an air inlet, the side surface of the anti-magnetic interference isolation cover is provided with an air outlet, the fiber film is arranged on the air inlet of the anti-magnetic interference isolation cover, the high-definition camera is arranged in the anti-magnetic interference isolation cover, is provided with a built-in microprocessor, and has a lens which extends out of the anti-magnetic interference isolation cover downwards, the fan is arranged at; the high-definition camera and the built-in micro processor are connected with the central processor through network cables or wifi information; the fan and the temperature detector are both electrically connected with the central processor.
The utility model discloses an anti-magnetic interference cage is cylindricality cover or oval spherical cover, surrounds being provided with the exhaust hole more than two rings on anti-magnetic interference cage lateral wall.
When the short circuit or the trouble that opens circuit appear in copper electrolysis polar plate, the polar plate surface will appear the thermal field change, and its thermal field (or thermal radiation intensity) exist obvious difference with the non-trouble polar plate thermal field promptly, the utility model discloses the device passes through the high sensitivity of infrared thermal imaging's luminous intensity and surveys scanning system, can come out this thermal field audio-visual reflection. From the thermal image, it is easy to find the highest temperature point or the lowest temperature point in the thermal field, which is the thermal failure point, i.e. the plate in the electrolytic cell where the short circuit or open circuit failure occurs. The utility model discloses carry out accurate temperature measurement with copper electrolysis polar plate in the electrolysis trough according to above-mentioned principle to report the accurate positioning information of the copper electrolysis polar plate of temperature anomaly.
Compared with the prior art, the utility model, there are following advantage at least:
1) the problems of low reliability, poor accuracy and the like of manual detection are solved, the labor intensity of workers is reduced, and disturbance to the electrolyte and influence on the settlement effect of anode mud when the electrolytic bath is scanned by manually holding the Gaussian instrument are effectively avoided;
2) the temperature monitoring precision of the copper electrolysis polar plate can reach +/-0.5 ℃, high-sensitivity information collection of temperature change on the surface of the fault polar plate is realized, information such as the coordinate position of the fault polar plate is accurately judged, manual secondary scanning is not needed to search the fault polar plate, in addition, online networking and reporting of faults can be assisted, a manager or an operator can remotely and deeply master real-time production conditions, the operator can accurately process the fault polar plate conveniently, invalid power consumption is effectively controlled, and the purpose of improving quality and increasing efficiency of cathode copper electrolysis production is realized;
3) the method is particularly suitable for continuous and real-time monitoring of the process condition of the high-impurity anode plate electrolysis process, and is convenient for finding out the copper electrolysis fault electrode plate condition in time, so that accurate fault electrode plate information is provided for field operators and processed in time, and the stability of the production process and the improvement of the cathode copper yield are ensured.
Drawings
Fig. 1 is a schematic view of the apparatus of the present invention;
FIG. 2 is a flow chart of an infrared thermal imaging system for accurately judging fault information of a copper electrolysis polar plate;
FIG. 3 is a schematic top view of an empty electrolytic cell;
FIG. 4 is a schematic top view of an electrolytic cell equipped with copper electrolysis plates;
FIG. 5 is a schematic diagram of the identification and numbering positioning of the digital signals of the copper electrolysis plate.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in figure 1, the device for improving the accuracy of judging the fault information of the copper electrolysis polar plate comprises an infrared thermal imager, a central processor 9 in information connection with the infrared thermal imager, a display 10 in information connection with the central processor, and an alarm 11 connected with the display and the central processor. The infrared thermal imager comprises an anti-magnetic interference isolation cover 3, a fiber membrane 5, a high-definition camera 1, a fan 4 and a temperature detector 7, wherein an air inlet hole is formed in the top of the infrared thermal imager, an exhaust hole 6 is formed in the side face of the infrared thermal imager, the fiber membrane 5 is arranged on the air inlet hole of the anti-magnetic interference isolation cover, the high-definition camera 1 is arranged in the anti-magnetic interference isolation cover, is provided with a built-in micro processor 2, and a lens of the high-definition camera extends out of the anti-magnetic interference isolation cover downwards, and is. The high-definition camera 1 and the built-in micro processor 2 of the infrared thermal imager are connected with the central processor 9 through the network cable 8 or wifi information. The fan 4 and the temperature detector 7 are both electrically connected with the central processor 9. The anti-magnetic interference isolation cover 3 is a cylindrical cover or an elliptical spherical cover, more than two circles of exhaust holes 6 are arranged on the side wall of the anti-magnetic interference isolation cover in an encircling manner, and 9 circles of exhaust holes with the aperture of 0.5mm are arranged in the anti-magnetic interference isolation cover.
The method for accurately judging the fault information of the copper electrolytic cell pole plate by adopting the device of the utility model is shown in figures 2 to 5, and the method is as follows:
1) an infrared thermal imager is arranged above the surface of the electrolytic cell 12, a high-definition camera 1 photographs and images the surface of the electrolytic cell and a copper electrolytic plate thereof, a built-in micro processor 2 converts an infrared thermal imaging signal into a digital signal and transmits the digital signal to a central processor 9. The installation position of the infrared thermal imager is about 12m higher than the horizontal cell surface of the electrolytic cell, the cell surface of the electrolytic cell and the copper electrolytic plate thereof with the vertical center radius within 45m can be subjected to high-definition infrared scanning imaging and identification, and the running track of a special crane for electrolysis can be avoided without mutual influence. The scanning range of the infrared thermal imager can be adjusted within a radius of 200m, a built-in micro-processor 2 supports 1080P high-definition thermal imaging pictures, the code stream is transmitted to a central processor 9 at the speed of 2-4 Mbps, the central processor supports picture storage for more than 30 days, and field picture and video playback is supported. The infrared thermal imager scans and images the copper electrolytic plate on the surface of the electrolytic cell within a scanning range once every 0.5-10 ms (adjustable scanning speed), collects and identifies infrared temperature data of the copper electrolytic plate on the surface of the electrolytic cell through frequent scanning, and the built-in micro processor 2 converts infrared thermal imaging signals into digital signals and transmits the converted digital signals to the central processor 9 through the network 8 or wifi. The anti-magnetic interference isolation cover 3 can filter out irrelevant information such as electromagnetic field interference of the electrolytic cell and the like, and realizes high-definition acquisition of imaging information of the copper electrolysis polar plate by the infrared thermal imager. FIG. 3 is a schematic top view of an empty electrolytic cell 12; FIG. 4 is a schematic plan view of the electrolytic cell with the copper electrolysis electrode plate 13 attached thereto.
2) Referring to fig. 5, the central processor 9 identifies, codes and positions the digital signals of the copper electrolysis polar plate; the polar plate is only required to be manually calibrated with coordinate information when picture information of infrared thermal imaging is firstly converted into a digital signal, such as a 1-series No. 1 groove, a 1-series No. 2 groove, a 1-series No. 3 groove and a 1-series No. 4 groove … …, and further such as a No. 1 anode (anode 1), a No. 1 cathode (cathode 1), a No. 2 anode (anode 2), a No. 2 cathode (cathode 2), a No. 3 anode (anode 3), a No. 3 cathode (cathode 3), a No. 4 anode (anode 4) and a No. 4 cathode (cathode 4) … … which are numbered in the longitudinal direction of the polar plate in each groove. If the manual check finds that the actual fault polar plate coordinate is not consistent with the coordinate displayed on the fault information display, the polar plate coordinate information can be directly and manually modified and corrected in the central processor 9 system.
3) The standard temperature parameters under the non-fault condition of the copper electrolysis polar plate are manually collected and embedded into the central processor, the standard temperature parameters comprise standard temperature parameters under two modules of covering groove covering cloth and uncovering groove covering cloth, and the standard temperature parameters of the two modules are embedded into the central processor 9 for identification, so that the central processor can automatically identify the two modules under the digital signals. The method for acquiring the standard temperature parameters is to manually set a copper electrolysis pole plate under a non-fault condition in advance, acquire temperature data of the copper electrolysis pole plate within 30-60 min of the electrifying time under the condition of normal electrifying electrolysis, wherein the temperature data acquisition point is required to acquire the area range of the area with the distance between the conductive contact of the electrolysis pole plate and the area range of the area with the width of 24mm, 50-300 pieces of temperature data are required to be monitored, the average temperature value is calculated, and the average temperature value of +/-3 ℃ is determined as the standard temperature parameter of the copper electrolysis pole plate and is given to a central processor 9;
4) the central processor 9 carries out secondary identification on the digital signal of the copper electrolysis polar plate, converts the digital signal into a digital temperature signal, and carries out intelligent analysis and comparison on the digital temperature signal and the standard temperature parameter again to judge fault information. If the average temperature value of the polar plate digital temperature signal is within +/-3 ℃, the polar plate digital temperature signal is normal temperature, and no statistical report is made; for values above the average temperature +3 deg.C, a short circuit fault is reported, and for values below the average temperature-3 deg.C, an open circuit fault is reported. When fault information exists, the central processor 9 transmits the fault information to the alarm 11, the alarm adopts an audible and visual alarm and can give out buzzing sound and flashing light for alarm, and when the fault is completely eliminated, the alarm does not give out any warning signal.
For example, under the condition of not covering a tank cover cloth module, the actual standard polar plate temperature parameters under the module are manually collected, the temperatures of 45 collected standard polar plates are monitored, the average temperature is calculated to be 60 ℃, the calculated average temperature value of 60 +/-3 ℃ is taken as a polar plate reference standard temperature, namely 57-63 ℃, the temperature of 57-63 ℃ is given to a central processor to carry out intelligent analysis and comparison on digital temperature signals, a polar plate higher than 63 ℃ is judged to be a short-circuit polar plate, a polar plate lower than 57 ℃ is judged to be a broken polar plate, and the polar plate is taken as a normal temperature at 57-63 ℃, and short circuit or broken circuit is not reported in a fault alarm system.
For another example, in the case of a covering slot cloth module, the actual standard polar plate temperature parameters under the module are manually acquired, 50 acquired standard polar plate temperatures are monitored, the average temperature is calculated to be 57 ℃, the calculated average temperature value of 57 ℃ +/-3 ℃ is taken as the polar plate reference standard temperature, namely 54-60 ℃, the temperature of 54-60 ℃ is given to a central processor to carry out intelligent analysis and comparison on digital temperature signals, polar plates higher than 60 ℃ are judged to be 'short-circuited' polar plates, polar plates lower than 54 ℃ are judged to be 'open circuit' polar plates, and polar plates lower than 54-60 ℃ are normal temperatures, and short circuit or open circuit is not reported in a fault alarm system.
Further, similar reason, under same copper electrolysis production technology control condition, still there are seasonal temperature variation and regional ambient temperature difference, also can be according to actual conditions, the short circuit trouble or the specific regional temperature condition of trouble polar plate that opens circuit of local different time quantum of manual monitoring come the standard and judge the temperature, with this help the utility model discloses the accurate analysis of device judges the trouble polar plate condition, and the temperature is judged to the real-time correction standard. The standard temperature parameter of trouble copper electrolysis polar plate does not limit to the utility model discloses appointed temperature reference value can select reasonable short circuit trouble or open circuit trouble judgement temperature reference value according to actual conditions.
The fault information is classified and gathered in a fault reporting system, reports are automatically generated for the copper electrolytic pole plate information with open circuit or short circuit, and the fault information is fed back to managers or operators in real time through a network every hour, so that the managers can control the production condition of the electrolytic cell in real time, and the operators can timely and accurately process the faults. The real-time display digital picture signal, coordinate and other information of the fault polar plate is displayed on the fault information display in real time, so that the field operators can observe and use the fault polar plate conveniently. The fault pole plate information is collected and reported, and the related fault information comprises: the coordinate position of the fault polar plate, the temperature of the fault polar plate, the fault occurrence time and the fault elimination time. The fault information is displayed on the display 10 in a tabular form in real time, see table 1. Through the detailed method provided by the utility model, the infrared thermal imaging system can be realized exceeding the judgement of 96% accuracy to copper electrolysis polar plate fault information.
TABLE 1 faulty Pole plate information report
When the device and the method of the utility model are used for monitoring the fault information of the copper electrolysis polar plate, the fan 4 in the starting device can enable the anti-magnetic interference isolation cover 3 to internally form a micro positive pressure of 5-30 Pa. The fan 4 exhausts air from the top, the exhausted air can enter the anti-magnetic interference isolation cover after penetrating the fiber membrane 5 with the aperture of 2.5um, and the exhaust hole 6 exhausts air outwards; the temperature detector 7 monitors the temperature of the microenvironment inside the anti-magnetic interference isolation cover. The temperature of the microenvironment in the anti-magnetic interference isolation cover is required to be controlled to be 25-35 ℃, the alarm is given out when the temperature is higher than or lower than the temperature range, alarm information is fed back through the alarm 11, the accurate temperature of the microenvironment in the anti-magnetic interference isolation cover is displayed on the display screen 10, temperature faults are processed through manual troubleshooting and are lower than the temperature range required, the infrared thermal imager needs to be started manually to operate and is higher than the temperature range required, the fiber membrane 5 can be replaced preferentially, the operation of the infrared thermal imager is suspended for 10-30 min, then the infrared thermal imager can be started manually to operate, or a small fan can be held manually to blow the whole infrared thermal imager for 30-60 min, and the whole temperature of the infrared thermal imager is reduced to be lower than 35 ℃ and then the operation is restarted.
Further, when the fault monitoring result of the copper electrolysis pole plate is judged incorrectly, a standard infrared temperature measuring gun or other standard temperature measuring tools can be used for auxiliary judgment and comparison, temperature actual measurement is manually carried out on a monitoring area with the distance between a conductive contact of the field pole plate and 200-250 mm, 50-300 or more temperature data (the upper limit data volume is not limited, but the lower limit is required to be more than or equal to 30 standard temperature measuring data) need to be actually measured, the calculated average value +/-3 ℃ is taken as the pole plate reference standard temperature, the reference marking temperature is compared with the infrared thermography imaging cathode copper temperature, and if the temperature difference exceeds +/-3 ℃, the fault judgment standard temperature needs to be calibrated again.
Claims (2)
1. A device for improving the accuracy of judging the fault information of a copper electrolysis polar plate is characterized by comprising an infrared thermal imager, a central processor (9) in information connection with the infrared thermal imager, a display (10) in information connection with the central processor, and an alarm (11) connected with the central processor and the display; the infrared thermal imager comprises an anti-magnetic interference isolation cover (3) with an air inlet hole formed in the top and an exhaust hole (6) formed in the side face, a fiber film (5) arranged on the air inlet hole of the anti-magnetic interference isolation cover, a high-definition camera (1) which is arranged in the anti-magnetic interference isolation cover and is provided with a built-in micro processor (2) and a lens extending out of the anti-magnetic interference isolation cover downwards, a fan (4) arranged at the upper part in the anti-magnetic interference isolation cover and a temperature detector (7) arranged in the anti-magnetic interference isolation cover; the high-definition camera (1) and the built-in micro processor (2) are connected with the central processor (9) through a network cable (8) or wifi information; the fan (4) and the temperature detector (7) are electrically connected with the central processor (9).
2. The device for improving the accuracy of judging the fault information of the copper electrolysis polar plate according to claim 1, wherein the anti-magnetic interference shielding case (3) is a cylindrical case or an elliptical spherical case, and more than two circles of vent holes are arranged on the side wall of the anti-magnetic interference shielding case in a surrounding manner.
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| CN201822145950.XU CN213086134U (en) | 2018-12-20 | 2018-12-20 | Device for improving fault information judgment accuracy of copper electrolysis polar plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109402667A (en) * | 2018-12-20 | 2019-03-01 | 昆明理工大学 | A kind of device and method improving cupric electrolysis pole plate fault message accuracy of judgement degree |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109402667A (en) * | 2018-12-20 | 2019-03-01 | 昆明理工大学 | A kind of device and method improving cupric electrolysis pole plate fault message accuracy of judgement degree |
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