Detection device for heavy metals in groundwater applicable to water quality detection

Abstract

The present invention provides a detection device for heavy metals in groundwater based on water quality detection, which relates to the technical field of water quality detection and includes: a base, on the top of which four telescopic rods are fixedly arranged; a U-shaped frame is integrally arranged in the middle of the top of the base; a lifting seat, which is fixedly arranged on the top of the four telescopic rods; a main rotating cylinder, the outer side of the top of the main rotating cylinder is rotatably arranged on the front side of the lifting seat through a bearing. According to the main rotating cylinder of the embodiments of the present invention, a digging function of descending and moving during the drilling process is provided. The digging motor drives the lifting lead screw, the front transmission shaft and the rear transmission shaft to rotate through bevel gears. The lifting lead screw cooperates with the U-shaped frame to generate a screw drive. The connecting rod drives the spiral drill rod to rotate and descend at the same time to realize detection. The connecting rod can be continuously spliced and can move downward to adapt to groundwater at different depths to provide a detection effect, solving the problem that the existing detection device is inconvenient to descend and move during the drilling process.

Description

Technical Field

[0001] The present invention relates to the technical field of water quality detection, and particularly to a detection device for heavy metals in groundwater applicable to water quality detection. Background Art

[0002] Groundwater refers to the water stored in the rock voids below the ground surface. Narrowly speaking, it refers to the water in the saturated aquifer below the groundwater table. Groundwater usually exists in two ways: flowing and static. It is necessary to use a drilling device in cooperation with a water pipe for extraction and detection after sampling.

[0003] However, the currently used detection devices are mainly single-hole spliced extraction structures, which are not conducive to descending and moving during the drilling process, realizing through-hole control, and ensuring that normal docking and drilling are not affected during the lifting process. They lack a circulating function for selective extraction according to usage needs, and it is difficult to ensure the balance of underground pressure during the extraction of groundwater. Summary of the Invention

[0004] In view of this, the present invention provides a detection device for heavy metals in groundwater applicable to water quality detection, which has an inner rotating cylinder and a protective sleeve, provides a rotary connection function, can maintain the transportation of groundwater during rotation, and thus realizes the connection during transportation.

[0005] The present invention provides a detection device for heavy metals in groundwater applicable to water quality detection, specifically including: a base, on the top of which four telescopic rods are fixedly arranged; a U-shaped frame is integrally arranged in the middle of the top of the base; a lifting seat, which is fixedly arranged on the top of the four telescopic rods; a main rotating cylinder, the outer side of the top of which is rotatably arranged on the front side of the lifting seat through a bearing; two connecting pipes are fixedly arranged on the top of the main rotating cylinder, and the opening heights of the tops of the connecting pipes are different and are respectively connected to inner rotating cylinders; a protective sleeve, which is rotatably arranged outside the two inner rotating cylinders through three bearings, two annular grooves are opened on the inner side of the protective sleeve, the annular grooves hermetically wrap the inner rotating cylinders, and the connecting pipes are communicated with the annular grooves in the inner rotating cylinders; a centrifuge, which is fixedly arranged on the top of the lifting seat through a bracket; a worm, which is rotatably arranged on the top of the lifting seat through a bracket; a receiving cylinder, the rear side of which is rotatably arranged on the rear side of the top of the base through a bracket, and both ends of the receiving cylinder are eccentric structures.

[0006] Optionally, the lifting seat includes: a lifting screw, a lifting screw is rotatably arranged in the middle of the bottom of the lifting seat, and the lifting screw is threadedly connected to the U-shaped frame; a sliding seat, the bottom end of the lifting screw is rotatably arranged in the sliding seat, and the sliding seat is slidably arranged in the U-shaped frame; a front transmission shaft, a rear transmission shaft is rotatably arranged at the front side of the bottom of the lifting seat; a rear transmission shaft, a rear transmission shaft is rotatably arranged at the rear side of the bottom of the lifting seat; the lifting screw, the front transmission shaft and the rear transmission shaft are connected by bevel gear transmission; an excavation motor, an excavation motor is fixedly arranged at the rear end of the bottom of the lifting seat, and the excavation motor is connected by transmission to the rear transmission shaft; when the excavation motor rotates, the lifting screw, the front transmission shaft and the rear transmission shaft are synchronously rotated and connected.

[0007] Optionally, the main rotating drum also includes: a connecting rod, the top outer side of the connecting rod is a hexagonal structure, two groups of fan-shaped through holes are opened inside the connecting rod, and fan-shaped tubes are fixedly arranged in the fan-shaped through holes, and the top of the fan-shaped tube is aligned with the bottom end of the hexagonal structure; the upper and lower ends of the connecting rod can be matched and spliced; the two groups of connecting rods can be fixedly connected by screws; the bottom end of the connecting rod has the same structure as the bottom end of the main rotating drum.

[0008] Optionally, the main rotating drum also includes: an auger rod, the upper outer part of the auger rod is integrally provided with a lower edge and an upper edge from bottom to top; an air hole, an air hole is opened in the upper and middle section of the outer part of the auger rod between the lower edge and the upper edge, and filter cotton is arranged in the air hole; the top end of the auger rod has the same structure as the top end of the connecting rod; and a closing sleeve, the closing sleeve is slidably arranged on the outer part of the auger rod between the lower edge and the upper edge, and the height of the closing sleeve is greater than the air hole.

[0009] Optionally, the main rotating drum further comprises: an inner ratchet gear, and the inner ratchet gear is fixedly arranged on the upper part of the outer part of the main rotating drum; and a bevel gear is arranged at the front end of the front transmission shaft to mesh with the inner ratchet gear.

[0010] Optionally, the protective sleeve includes: an output tube, which is connected to the upper rear side of the protective sleeve; an input tube, which is connected to the lower rear side of the protective sleeve; the output tube is connected to the top of the centrifuge; a rotating sleeve, the rear side of the input tube is turned upward and connected to the rotating sleeve, the rear end of the accommodating cylinder is rotatably arranged in the rotating sleeve with two sets of airtight bearings, and a through hole is opened at the outer side of the accommodating cylinder at a position inside the rotating sleeve.

[0011] Optionally, the centrifuge includes: a centrifugal motor, which is connected to the middle of the front end of the centrifuge; a ball valve A, which is connected to the middle of the rear end of the centrifuge, and an alignment sleeve is connected to the rear end of the ball valve A.

[0012] Optionally, the receiving cylinder includes: a worm gear fixedly arranged outside the front end of the receiving cylinder, the worm gear is in transmission connection with a worm; a tee joint, the rear end of the receiving cylinder passes through a rotating sleeve and is connected with a tee joint, and two groups of ball valves B are connected to both ends of the tee joint; a straight pipe is arranged to turn upward outside one group of ball valves B, and a sampling bottle is fixedly arranged above the other group of ball valves B by means of threaded connection.

[0013] Advantageous effects

[0014] According to the main rotating cylinder of the embodiments of the present invention, a digging function of descending and moving during the drilling process is provided. The digging motor drives the lifting lead screw, the front transmission shaft and the rear transmission shaft to rotate through bevel gears. The lifting lead screw cooperates with the U-shaped frame to generate screw transmission, driving the lifting seat to descend, and further driving the electric main rotating cylinder to descend. The connecting rod drives the spiral drill rod to rotate and descend simultaneously to achieve detection. The connecting rod can be continuously spliced and can move downward to adapt to groundwater at different depths to provide detection effects.

[0015] In addition, the setting of the receiving cylinder provides a circulating function that requires selective extraction. The centrifugal force provides a conveying function, the output pipe provides an output function, the air in the receiving cylinder is pumped out, passes through the protective sleeve and enters the sector pipe and the connecting rod and is conveyed downward, and is discharged from the outside of the air holes. At the same time, the input pipe provides a pumping function to pump out the groundwater, and the groundwater finally enters the receiving cylinder. During this process, the underground pressure balance can be maintained, and when the receiving cylinder is full, it will automatically circulate without causing any impact.

[0016] In addition, the settings of the ball valve A and the ball valve B provide multiple control functions. When sampling is required, rotate the worm to drive the worm gear to rotate half a turn, turn over the receiving cylinder, close the ball valve A, open the ball valve B connected to the sampling bottle, and the groundwater in the receiving cylinder enters the sampling bottle. Close the ball valve B and then the sampling bottle can be taken out for testing; reverse the above steps, and open the ball valve A to automatically backfill the groundwater. Description of the drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0018] The drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0019] In the drawings:

[0020] Figure 1 A three-dimensional structural schematic diagram according to an embodiment of the present invention is shown;

[0021] Figure 2 An axonometric structural schematic diagram according to an embodiment of the present invention is shown;

[0022] Figure 3Shows a schematic side elevation structure diagram according to an embodiment of the present invention;

[0023] Figure 4 Shows a schematic side view structure diagram according to an embodiment of the present invention;

[0024] Figure 5 Shows a schematic drainage state structure diagram according to an embodiment of the present invention;

[0025] Figure 6 Shows a schematic partial disassembly structure diagram according to an embodiment of the present invention;

[0026] Figure 7 Shows a schematic enlarged partial structure diagram of A according to an embodiment of the present invention;

[0027] Figure 8 Shows a schematic enlarged partial structure diagram of B according to an embodiment of the present invention.

[0028] List of reference numerals

[0029] 1, base; 101, telescopic rod; 102, U-shaped frame; 2, lifting seat; 201, lifting lead screw; 202, sliding seat; 203, front transmission shaft; 204, rear transmission shaft; 205, excavation motor; 3, main rotating cylinder; 301, connecting rod; 302, fan-shaped through hole; 303, fan-shaped pipe; 304, screw drill rod; 305, lower edge; 306, upper edge; 307, air hole; 308, closed sleeve; 309, connecting pipe; 310, inner rotating cylinder; 311, inner ratchet gear; 4, protective sleeve; 401, output pipe; 402, input pipe; 403, rotating sleeve; 5, centrifuge; 501, centrifugal motor; 502, ball valve A; 503, alignment sleeve; 6, worm; 7, receiving cylinder; 701, worm gear; 702, tee; 703, ball valve B; 704, sampling bottle. Detailed implementation manners

[0030] In order to make the objectives, solutions, and advantages of the technical solutions of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the specific embodiments of the present invention. Unless otherwise specified, the terms used herein have the ordinary meanings in the art. The same reference numerals in the drawings represent the same components.

[0031] Embodiment: Please refer to Figures 1 to 8 :

[0032] The present invention provides a detection device for heavy metals in groundwater based on water quality detection, including: a base 1, on the top of which four telescopic rods 101 are fixedly arranged; in the middle of the top of the base 1, a U-shaped frame 102 is integrally arranged; a lifting seat 2, which is fixedly arranged on the top of the four telescopic rods 101; a main rotating cylinder 3, the outer side of the top of which is rotatably arranged on the front side of the lifting seat 2 in cooperation with a bearing; on the top of the main rotating cylinder 3, two connecting pipes 309 are fixedly arranged, and the opening heights of the tops of the connecting pipes 309 are different, and are respectively connected with inner rotating cylinders 310; a protective sleeve 4, which is rotatably arranged outside the two inner rotating cylinders 310 in cooperation with three bearings, two annular grooves are arranged on the inner side of the protective sleeve 4, the annular grooves hermetically wrap the inner rotating cylinders 310, and the connecting pipes 309 are communicated with the annular grooves in the inner rotating cylinders 310; a centrifuge 5, which is fixedly arranged on the top of the lifting seat 2 in cooperation with a bracket; a worm 6, which is rotatably arranged on the top of the lifting seat 2 in cooperation with a bracket; a receiving cylinder 7, the rear side of which is rotatably arranged on the rear side of the top of the base 1 in cooperation with a bracket, and both ends of the receiving cylinder 7 are eccentric structures.

[0033] In addition, according to an embodiment of the present invention, refer to Figure 3 , the lifting seat 2 includes: a lifting lead screw 201, which is rotatably arranged in the middle of the bottom of the lifting seat 2, and the lifting lead screw 201 is threadedly connected with the U-shaped frame 102; a sliding seat 202, the bottom end of the lifting lead screw 201 is rotatably arranged in the sliding seat 202, and the sliding seat 202 is slidably arranged in the U-shaped frame 102; a front transmission shaft 203, which is rotatably arranged on the front side of the bottom of the lifting seat 2; a rear transmission shaft 204, which is rotatably arranged on the rear side of the bottom of the lifting seat 2; the lifting lead screw 201, the front transmission shaft 203 and the rear transmission shaft 204 are connected by bevel gears in transmission; an excavation motor 205, which is fixedly arranged at the rear end of the bottom of the lifting seat 2, and the excavation motor 205 is in transmission connection with the rear transmission shaft 204; when the excavation motor 205 rotates, the lifting lead screw 201, the front transmission shaft 203 and the rear transmission shaft 204 are synchronously rotationally connected.

[0034] In addition, according to an embodiment of the present invention, refer to Figure 6 , the main rotating cylinder 3 further includes: a connecting rod 301, the outer side of the top of the connecting rod 301 is hexagonal, two fan-shaped through holes 302 are arranged inside the connecting rod 301, a fan-shaped pipe 303 is fixedly arranged in the fan-shaped through holes 302, and the top end of the fan-shaped pipe 303 is aligned with the bottom end of the hexagonal structure; the upper and lower ends of the connecting rod 301 can be spliced together; two connecting rods 301 can be fixedly connected by screws; the bottom end of the connecting rod 301 has the same structure as the bottom end of the main rotating cylinder 3 and can be spliced up and down.

[0035] In addition, according to an embodiment of the present invention, refer to Figure 6, the main rotating drum 3 further includes: a spiral drill rod 304, with a lower edge 305 and an upper edge 306 integrally arranged from bottom to top on the outer part above the spiral drill rod 304; air holes 307, in the middle and upper part of the part of the outer part of the spiral drill rod 304 between the lower edge 305 and the upper edge 306, air holes 307 are provided, and filter cotton is arranged in the air holes 307; the top end of the spiral drill rod 304 has the same structure as the top end of the connecting rod 301; a closed sleeve 308, the closed sleeve 308 is slidably arranged on the part of the outer part of the spiral drill rod 304 between the lower edge 305 and the upper edge 306, the height of the closed sleeve 308 is greater than that of the air holes 307, the bottom edge of the closed sleeve 308 is a flange structure and can automatically lift when hindered by the ground during descent. After the spiral drill rod 304 is inserted into the groundwater, the closed sleeve 308 naturally descends to expose the air holes 307.

[0036] In addition, according to an embodiment of the present invention, referring to Figure 7 , the main rotating drum 3 further includes: an internal ratchet gear 311, the internal ratchet gear 311 is fixedly arranged above the outer part of the main rotating drum 3; the front end of the front transmission shaft 203 is provided with a bevel gear meshing with the internal ratchet gear 311 to provide a one-way transmission effect.

[0037] In addition, according to an embodiment of the present invention, referring to Figure 6 , the protective sleeve 4 includes: an output pipe 401, the output pipe 401 is connected and arranged above the rear side of the protective sleeve 4; an input pipe 402, the input pipe 402 is connected and arranged below the rear side of the protective sleeve 4; the output pipe 401 is connected to the top of the centrifuge 5; a rotating sleeve 403, the rear side of the input pipe 402 turns upward and is connected and arranged with a rotating sleeve 403, and the rear end of the accommodating cylinder 7 is rotatably arranged in the rotating sleeve 403 with two groups of airtight bearings, and through holes are provided at the position of the outer side of the accommodating cylinder 7 within the rotating sleeve 403.

[0038] In addition, according to an embodiment of the present invention, referring to Figure 4 and Figure 8 , the centrifuge 5 includes: a centrifugal motor 501, the centrifugal motor 501 is connected and arranged in the middle of the front end of the centrifuge 5; a ball valve A502, the ball valve A502 is connected and arranged in the middle of the rear end of the centrifuge 5, and a centering sleeve 503 is connected to the rear end of the ball valve A502.

[0039] In addition, according to an embodiment of the present invention, referring to Figures 4 - 5, the receiving cylinder 7 includes: a worm gear 701 fixedly arranged on the outer part of the front end of the receiving cylinder 7, and the worm gear 701 is in transmission connection with the worm 6; a tee 702, the rear end of the receiving cylinder 7 passes through the rotating sleeve 403 and is connected with a tee 702, and two groups of ball valves B703 are connected to both ends of the tee 702; a straight pipe is arranged to turn upward outside one group of ball valves B703, and a sampling bottle 704 is fixedly arranged above the other group of ball valves B703 in a threaded connection. The sampling bottle 704 can be removed and replaced for sampling. When sampling is required, rotate the worm 6 to drive the worm gear 701 to rotate half a turn, turn over the receiving cylinder 7, close the ball valve A502, open the ball valve B703 connected to the sampling bottle 704, the groundwater in the receiving cylinder 7 enters the sampling bottle 704, and close the ball valve B703 to take out the sampling bottle 704 for testing; operate the above steps in reverse, and open the ball valve A502 to automatically backfill the groundwater.

[0040] The specific usage method and function of this embodiment: In the present invention, when in use, place the base 1 at the opening, start the excavation motor 205, drive the lifting lead screw 201, the front drive shaft 203 and the rear drive shaft 204 to rotate through the bevel gears. The lifting lead screw 201 cooperates with the U-shaped frame 102 to generate a threaded drive, driving the lifting seat 2 to descend, and further driving the electric main rotating cylinder 3 to descend. At the same time, the main rotating cylinder 3 drives the connecting rod 301 to rotate, and the connecting rod 301 drives the spiral drill rod 304 to rotate and descend at the same time; after a group of connecting rods 301 descend, untie the lower end of the connecting rod 301, then reverse the excavation motor 205, install an additional connecting rod 301, and move the spiral drill rod 304 downward; the bottom edge of the closing sleeve 308 is a flange structure. During this process, when descending and being blocked by the ground, it can automatically lift up to close and protect the air hole 307. Then, after the spiral drill rod 304 is inserted into the groundwater, the closing sleeve 308 naturally descends to expose the air hole 307;

[0041] The ball valve A502 remains open, and the ball valve B703 remains closed;

[0042] Start the centrifugal motor 501 to drive the centrifuge 5 to operate, provide a conveying function through centrifugal force, the output pipe 401 provides an output function, extract the air in the receiving cylinder 7, pass through the protective sleeve 4 and be conveyed downward into the sector pipe 303 and the connecting rod 301, and discharge from the outside of the air hole 307. At the same time, the input pipe 402 provides a pumping function to pump out the groundwater, and the groundwater finally enters the receiving cylinder 7; the underground pressure balance can be maintained during this process, and it will automatically circulate when the receiving cylinder 7 is full without causing any impact;

[0043] When sampling is required, rotate the worm gear 6 to drive the worm wheel 701 to rotate half a turn, turn the receiving cylinder 7 over, close the ball valve A502, open the ball valve B703 connecting the sampling bottle 704, the groundwater in the receiving cylinder 7 enters the sampling bottle 704, and close the ball valve B703 to take out the sampling bottle 704 for testing; operate the above steps in reverse, and open the ball valve A502 to automatically backfill the groundwater.

[0044] Finally, it should be noted that when describing the positions of various components and their mating relationships, etc., usually one / a pair of components are taken as examples. However, those skilled in the art should understand that such positions, mating relationships, etc. are equally applicable to other components / other pairs of components.

[0045] The above description is only an exemplary embodiment of the present invention and is not intended to limit the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

Claims

1. A detection device for heavy metals in groundwater applicable to water quality detection, characterized in that, Including: Base (1), on the top of which four telescopic rods (101) are fixedly arranged; in the middle of the top of the base (1), a U-shaped frame (102) is integrally arranged; a lifting seat (2) is fixedly arranged on the top of the four telescopic rods (101); the outer side of the top of the main rotating cylinder (3) is rotatably arranged on the front side of the lifting seat (2) by means of a bearing; two connecting pipes (309) are fixedly arranged on the top of the main rotating cylinder (3), and the opening heights of the tops of the connecting pipes (309) are different and are respectively connected with inner rotating cylinders (310); a protective sleeve (4) is rotatably arranged on the outside of the two inner rotating cylinders (310) by means of three bearings, two annular grooves are arranged on the inner side of the protective sleeve (4), the annular grooves hermetically wrap the inner rotating cylinders (310), and the connecting pipes (309) are communicated with the annular grooves in the inner rotating cylinders (310); a centrifuge (5) is fixedly arranged on the top of the lifting seat (2) by means of a bracket; the rear side of the accommodating cylinder (7) is rotatably arranged on the rear side of the top of the base (1) by means of a bracket, and the two ends of the accommodating cylinder (7) are eccentric structures; a lifting lead screw (201) is rotatably arranged in the middle of the bottom of the lifting seat (2), and the lifting lead screw (201) is in threaded connection with the U-shaped frame (102); the bottom end of the lifting lead screw (201) is rotatably arranged in a sliding seat (202), and the sliding seat (202) is slidably arranged in the U-shaped frame (102); a front transmission shaft (203) is rotatably arranged on the front side of the bottom of the lifting seat (2); a rear transmission shaft (204) is rotatably arranged on the rear side of the bottom of the lifting seat (2); the lifting lead screw (201), the front transmission shaft (203) and the rear transmission shaft (204) are connected by bevel gear transmission; a digging motor (205) is fixedly arranged at the rear end of the bottom of the lifting seat (2), and the digging motor (205) is in transmission connection with the rear transmission shaft (204); the outer side of the top of the connecting rod (301) is hexagonal in structure, two sector-shaped through holes (302) are arranged inside the connecting rod (301), a sector-shaped pipe (303) is fixedly arranged in the sector-shaped through holes (302), and the top end of the sector-shaped pipe (303) is aligned with the bottom end of the hexagonal structure; the upper and lower ends of the connecting rod (301) are spliced in a matching manner; the two connecting rods (301) are fixedly connected by screws; the bottom end of the connecting rod (301) has the same structure as the bottom end of the main rotating cylinder (3); the lower edge (305) and the upper edge (306) are integrally arranged on the outside of the upper part of the spiral drill rod (304) from bottom to top; air holes (307) are arranged in the middle and upper part of the part of the outside of the spiral drill rod (304) between the lower edge (305) and the upper edge (306), and filter cotton is arranged in the air holes (307); the top end of the spiral drill rod (304) has the same structure as the top end of the connecting rod (301); a closed sleeve (308) is slidably arranged on the part of the outside of the spiral drill rod (304) between the lower edge (305) and the upper edge (306), and the height of the closed sleeve (308) is greater than that of the air holes (307); an internal ratchet gear (311) is fixedly arranged on the upper part of the outside of the main rotating cylinder (3); a bevel gear is arranged at the front end of the front transmission shaft (203) and meshes with the internal ratchet gear (311);An output pipe (401) is connected and arranged above the rear side of the protective sleeve (4); an input pipe (402) is connected and arranged below the rear side of the protective sleeve (4); the output pipe (401) is connected to the top of the centrifuge (5); a rotating sleeve (403), the rear side of the input pipe (402) turns upward and is connected and arranged with a rotating sleeve (403), the rear end of the accommodating cylinder (7) is rotatably arranged in the rotating sleeve (403) by cooperating with two airtight bearings, and through holes are formed at the position of the outer side of the accommodating cylinder (7) inside the rotating sleeve (403); the centrifuge (5) pumps out the air in the accommodating cylinder (7), passes through the protective sleeve (4) and enters the sector pipe (303) and the connecting rod (301) for downward delivery, and is discharged from the air holes (307), and the input pipe (402) provides a pumping function to pump out the groundwater and enter the accommodating cylinder (7).; 2. The detection device for heavy metals in groundwater based on water quality detection according to claim 1, wherein A centrifugal motor (501) is connected and arranged in the middle of the front end of the centrifuge (5); a ball valve A (502) is connected and arranged in the middle of the rear end of the centrifuge (5), and a centering sleeve (503) is connected and arranged at the rear end of the ball valve A (502).

3. The detection device for heavy metals in groundwater based on water quality detection according to claim 1, wherein It also includes a worm (6), and the worm (6) is rotatably arranged on the top of the lifting seat (2) in cooperation with a bracket; a worm gear (701) is fixedly arranged on the outside of the front end of the receiving cylinder (7), and the worm gear (701) is in transmission connection with the worm (6); the rear end of the receiving cylinder (7) passes through the rotating sleeve (403) and is connected and arranged with a tee (702), and two groups of ball valves B (703) are connected and arranged at both ends of the tee (702); a straight pipe is arranged to turn upward outside one group of ball valves B (703), and a sampling bottle (704) is fixedly arranged in a threaded connection above the other group of ball valves B (703).

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