CN115980299B - Monitoring device for groundwater pollutants - Google Patents

Abstract

The invention relates to a monitoring device for groundwater pollutants, and relates to the field of water resource monitoring, comprising a drilling cylinder, a power mechanism, a sampling mechanism and a water sample detection module; the side wall of the lower end of the drilling cylinder is provided with a water seepage hole, and a water sample collecting cavity is formed in the inner cavity of the drilling cylinder at the height of the water seepage hole; the power mechanism is in transmission connection with the drill cylinder; the sampling mechanism comprises a sampling bottle, a water taking assembly and a conveying assembly, the sampling bottle is arranged on the ground, the water taking assembly comprises a first piston, a connecting rod, a first one-way valve, a second one-way valve, a third one-way valve and a reciprocating driving piece, the conveying assembly comprises a first pipeline and a second pipeline, the first pipeline is coaxially arranged in the drill cylinder in a penetrating manner, the second pipeline is coaxially arranged in the first pipeline in a penetrating manner, and a conveying channel is arranged between the first pipeline and the second pipeline; the water sample detection module is connected with the sampling bottle. The underground water sampling depth is not limited by the pumping depth of the water pump, and the underground water sample collection of less than 10 meters can be realized, so that the monitoring depth range of underground water pollutants is enlarged.

Description

Monitoring device for groundwater pollutants

technical field

The invention relates to the field of water resource monitoring, in particular to a monitoring device for groundwater pollutants.

Background technique

Water is a basic material related to human survival and social development, a limited and irreplaceable precious resource, and an important guarantee for sustainable economic and social development. Groundwater is widely buried below the surface and has the characteristics of anaerobic, dark and low temperature. Among them, shallow groundwater mainly refers to phreatic or weakly confined water that is buried relatively shallow and has a direct relationship with local atmospheric precipitation or surface water bodies, mainly aquifers within 60 meters below the surface. Due to its shallow buried layer and no deep rock filtration, the water body is easily polluted by sewage discharged from factories and pesticide residues in farmland. Drinking shallow polluted groundwater will seriously affect people's health. Moreover, the permeability and fluidity of groundwater are poor, and the self-purification ability is not good. Once pollution occurs, it is difficult to recover. Therefore, it is of great significance to monitor and control groundwater pollutants to protect groundwater resources from pollution.

At present, the public date is July 05, 2017, and the Chinese invention patent with the publication number CN107328903A proposes a shallow groundwater pollutant monitoring system, which includes a monitoring well, a power mechanism for placing the monitoring well underground, and a sampling and detection system , the monitoring well includes a hollow worm connected with a drill bit, the lower end of the worm is provided with a collection chamber, the sampling detection system includes a water suction pipe, a water pump, a sampling bottle and a water quality detection module; one end of the water suction pipe goes deep into the water sample collection chamber of the monitoring well Among them, the other end is connected to the water pump, and the water sample is drawn from the water sample collection chamber into the sampling bottle through the water pump, and the water quality detection module monitors and analyzes the water sample in the sampling bottle.

For the related technologies mentioned above, the pump is used to extract the sewage water samples. The pumping depth of ordinary pumps is generally within 10 meters. However, due to the different geological environments, the monitoring depth of groundwater in different locations is also different. When the monitoring depth is greater than 10 meters, the above scheme is no longer applicable.

Contents of the invention

In order to make groundwater sampling without being limited by the pumping depth of a water pump, the invention provides a monitoring device for groundwater pollutants.

The monitoring device for groundwater pollutants provided by the present invention adopts the following technical scheme:

A monitoring device for groundwater pollutants, including: a drill barrel, a power mechanism for placing the drill barrel underground, a sampling mechanism, and a water sample detection module; the side wall of the lower end of the drill barrel is provided with a seepage hole, and the inner cavity of the drill barrel is A water sample collection cavity is formed at the height of the seepage hole; the power mechanism is connected to the drill barrel; the sampling mechanism includes a sampling bottle, a water intake assembly and a delivery assembly, the sampling bottle is set on the ground, and the water intake assembly includes a first piston, a connecting rod, a first A one-way valve, a second one-way valve, a third one-way valve and a reciprocating drive, the conveying assembly includes a first pipeline and a second pipeline, the first pipeline is coaxially installed in the drill tube, and the outer wall of the first tube is connected to the inner wall of the drill tube connection, the lower end of the first pipeline is located above the water sample collection chamber, the second pipeline is coaxially penetrated in the first pipeline, a delivery channel is formed between the first pipeline and the second pipeline, a sealing assembly is arranged at the bottom end of the delivery channel, and the delivery channel The upper end is provided with a sealing cover, and the sealing cover is provided with a water outlet pipe, which is connected to the sampling bottle; the lower end of the second pipe is provided with a first partition, a second partition and a first through hole, and the first partition and the second pipe The lower end surface of the pipe is connected, and the first partition is located above the water seepage hole. The second through hole is opened on the first partition. The axis of the second through hole is parallel to the axis of the first pipeline. The first check valve is set at the In the two through holes, and the opening direction of the first one-way valve is away from the water sample collection chamber; the second partition is arranged above the first partition, the first through hole is located between the first partition and the second partition, and The first through hole is opened on the side wall of the second pipeline, the first through hole connects the first pipeline and the second pipeline, and the second one-way valve is installed in the first through hole; the first piston is coaxially arranged on the second In the pipeline, and the first piston slides between the first partition and the first through hole; the first piston is provided with a third through hole, the axis of the third through hole is parallel to the axis of the first pipeline, and the third unidirectional The valve is arranged in the third through hole, and the opening direction of the third one-way valve is close to the first partition; one end of the connecting rod is connected to the end of the first piston away from the water sample collection chamber, and the other end is transmission connected to the reciprocating driving member, and the reciprocating The driving part is arranged on the bottom surface, and the water sample detection module is connected with the sampling bottle.

By adopting the above-mentioned technical scheme, when it is necessary to monitor groundwater pollutants in a certain place, first run the power mechanism, the power mechanism drives the drill barrel to rotate, drills the drill barrel into the soil, and makes the seepage hole located in the groundwater at the depth to be detected Then run the reciprocating drive, the reciprocating drive drives the connecting rod to move up and down, and then the connecting rod drives the first piston to reciprocate up and down in the second pipeline, when the first piston moves up and down, the first one-way valve, the second one-way The one-way valve and the third one-way valve are opened and closed alternately, so that the water sample in the collection chamber is gradually drawn into the delivery channel, so that the water sample flows out from the water outlet and then enters the collection bottle, and then the water sample detection module detects the sample in the sampling bottle. Water samples were tested for pollutants. Since the groundwater sample is drawn by the first piston reciprocating in the second pipeline, it is not affected by the depth of water sample collection, and groundwater sampling at any depth can be realized; the first piston is always placed in the second pipeline. Below, such a setting can realize real-time sampling of groundwater, so as to facilitate real-time monitoring of groundwater pollutants.

Optionally, the sealing assembly includes a sealing ring, the sealing ring is arranged coaxially in the first pipeline, the inner wall of the sealing ring abuts against the outer wall of the second pipeline, and the outer wall of the sealing ring is fixedly connected with the inner wall of the first pipeline; The second pipeline is movably connected to the first pipeline along the axial direction of the drill tube.

By adopting the above technical solution, when water samples need to be taken, the second pipeline is moved downwards so that the outer wall of the second pipeline abuts against the inner wall of the sealing ring to seal the lower end of the delivery channel, and then the first piston is operated to complete groundwater sampling. After the water sample is drawn, the second pipeline is moved upwards to disengage the outer wall of the second pipeline from the inner wall of the sealing ring, so that the remaining water samples in the delivery channel flow out from the bottom end of the delivery channel. With this setting, the delivery channel can have a switch function. When the water sample is drawn, the bottom end of the delivery channel is closed to ensure the extraction of the water sample. When the water sample is taken, the bottom end of the delivery channel is opened to make the remaining water in the delivery channel open. In this way, it can ensure that when the water sample is taken next time, the water sample flowing out of the delivery channel is the water sample at the collection depth, rather than the original water sample remaining in the delivery channel, which improves the accuracy of water sample collection. This improves the monitoring accuracy of groundwater pollutants.

Optionally, the sampling mechanism also includes a drainage assembly for emptying the water sample in the delivery channel. The drainage assembly includes an air compressor, an air inlet pipe and a gas on-off valve. One end of the air inlet pipe is connected to the air compressor, and the other end is connected to the gas on-off valve. The gas on-off valve is arranged on the sealing cover, and the air inlet pipe communicates with the conveying channel through the gas on-off valve.

By adopting the above technical scheme, when the water sample is extracted and the bottom end of the conveying channel is opened, the gas on-off valve is opened, the air compressor is operated, and the compressed air enters the upper end of the conveying channel through the intake pipe, at this time, the remaining water samples in the conveying channel will be Flow out from the lower end of the conveying channel. When the remaining water sample in the conveying channel is emptied, move the second pipeline downward to close the lower end of the conveying channel. At this time, stop the operation of the air compressor and close the gas on-off valve. In this way, when the water pressure in the water sample collection chamber is greater than the standard atmospheric pressure, the remaining water samples in the delivery channel will not be automatically discharged. At this time, the pressure gas in the delivery channel can ensure that the remaining water samples in the delivery channel The water samples are discharged cleanly, which improves the accuracy of the water samples flowing out of the delivery channel when the water samples are taken out next time, thereby improving the monitoring accuracy of groundwater pollutants.

Optionally, the sealing assembly further includes a second piston, the second piston is located under the sealing ring, the second piston is coaxially arranged in the drill barrel, the outer wall of the second piston abuts against the outer wall of the drill barrel, and one end of the second piston It is flexibly connected to the lower end of the second pipeline, and the height of the second piston is greater than the height of the water seepage hole opened on the drill tube.

By adopting the above technical solution, when the drill tube is placed underground under the action of the power mechanism, the outer wall of the second piston abuts against the side wall of the drill tube, and the second piston separates the seepage hole from the water sample collection chamber. This operation can prevent water samples from other heights from infiltrating into the water sample collection chamber during the process of placing the drill pipe underground, which improves the accuracy of water sample collection and thus improves the monitoring accuracy of groundwater pollutants. When the drill barrel reaches the specified depth and water samples need to be collected, move the second pipe downwards so that the second pipe pushes the second piston down the inner wall of the drill barrel, and when the seepage hole is completely separated from the piston, the second pipe goes up Move back to the initial position. At this time, the position of the second piston in the drill barrel does not change. The connection between the second piston and the second pipeline is loose. Extraction of water samples. When the water sample is taken out and the remaining water sample in the delivery channel needs to be discharged, the second pipeline is run upwards. At this time, the position of the second piston does not move, and the tension between the second piston and the second pipeline becomes tight, and the seal is sealed. The ring is disengaged from the second pipe, so that the remaining water samples in the delivery channel are discharged; when the remaining water samples in the delivery channel are discharged, continue to move up the second pipe, and at this time the second pipe drives the second piston to move up. When the holes are all in contact with the outer wall of the second piston, run the second pipeline downward, and stop moving the second pipeline when the second pipeline returns to the initial position; at this time, the power mechanism can be operated to drive the drill barrel to continue to move down to reach another Continue to collect water samples at a specified depth to realize the collection of groundwater samples at different depths. With such arrangement, by moving the second pipeline up and down, the second piston can be located in different positions in the drill barrel, and at the same time meet the different requirements for the second piston when drawing water samples, discharging water samples and working in the drill barrel.

Optionally, the sealing assembly further includes a conical sleeve, the maximum diameter of which is equal to the outer diameter of the second pipe, and the end of the conical sleeve with a larger diameter is coaxially connected to the lower end surface of the second pipe.

By adopting the above-mentioned technical scheme, when the bottom end of the conveying channel needs to be opened, the second pipe is moved upwards, which drives the conical sleeve to move upward. At this time, the conical sleeve is penetrated in the sealing ring, and a gap is formed between the conical sleeve and the sealing ring. The remaining water sample in the channel flows out from the gap; when the bottom of the conveying channel needs to be closed, run the second pipeline downward, and the second pipeline drives the cone sleeve to move down relative to the seal, and the cone sleeve passes through the seal and enters the seal Downward, when the inner wall of the sealing member abuts against the outer wall of the second pipeline, the second pipeline stops moving downward, and then the piston is operated to extract water samples. With such arrangement, when the second pipe enters and exits from the sealing ring, the tapered sleeve can play a guiding role, reducing damage to the sealing ring during the up and down movement of the second pipe, thereby increasing the service life of the sealing ring; in addition, Because when the cone sleeve is inserted into the sealing ring, there will be a gap, and the remaining water sample in the delivery channel can flow out from the gap. This setting can reduce the distance that the second pipeline moves upward when the delivery channel needs to be opened, thereby reducing the upward movement of the second pipeline. time energy consumption.

Optionally, the first piston is hingedly connected to the connecting rod.

By adopting the above technical solution, because the first piston runs at the bottom of the second pipeline, the length of the connecting rod is relatively long, so that during the operation of the first piston, the two rods will have a large bending deformation, and the first piston will be subjected to a large bending deformation. Lateral pressure will easily cause the first piston to get stuck when it is running, increasing the wear of the first piston, which will affect the operating accuracy and life of the first piston; the hinged connection between the first piston and the connecting rod can reduce the number of connections. When the rod is bent and deformed, the lateral pressure on the first piston will further reduce the stagnation phenomenon that occurs when the first piston is running, reduce the wear of the first piston, and improve the running accuracy and life of the first piston.

Optionally, the sampling mechanism also includes a lifting assembly that lifts the second pipeline. The lifting assembly includes a mounting bracket, a driving motor, a connecting plate, a driving screw and a nut; the mounting bracket is connected to the upper end of the first pipeline, and the driving motor is connected to the mounting bracket. on the bracket, and the drive motor is located above the second pipeline, one end of the connecting plate is connected to the screw nut, and the other end is connected to the second pipeline, the screw nut is threadedly connected to the drive screw, and one end of the drive screw is the same as the output shaft of the drive motor. The shaft is connected, and the other end is rotatably connected to the mounting bracket.

By adopting the above-mentioned technical scheme, when it is necessary to extract groundwater samples for testing, the drive motor is operated, and the drive motor drives the transmission screw to rotate, and the rotation of the drive screw drives the screw nut to move down, and the screw nut drives the connecting plate to move down, and the connecting plate drives the second When the pipeline moves down, the second pipeline pushes the second piston to move down. When the second piston is completely disengaged from the seepage hole, the driving motor is reversely rotated. The driving motor drives the driving screw to rotate in reverse, and the driving screw drives the screw nut to move upward. The screw nut drives the connecting plate to move, and the connecting plate drives the second pipeline to move upward. When the second pipeline moves up to the initial position, the driving motor stops running; at this time, the first piston is operated to collect water samples. When the water sample is taken out and the remaining water sample in the delivery channel needs to be discharged, continue to reversely rotate the drive motor, and then the second pipe continues to move upward. When the sealing ring is disengaged from the second pipe, the drive motor will run , so that the second pipeline stops moving up and down, and the water sample in the delivery channel is discharged at this time; when the water sample in the delivery channel is emptied, continue to reversely rotate the drive motor, so that the second pipeline moves upward, and the second pipeline drives The second piston moves up along the drill barrel, and when the water seepage holes are in contact with the outer wall of the second piston, the drive motor is driven in the forward direction, so that the second pipe moves downward and returns to the initial position; at this time, the power mechanism can drive the drill barrel Continue to move down to reach another designated depth to continue collecting water samples to realize the collection of groundwater samples at different depths. With such arrangement, the up and down movement of the second pipe and the second piston can be realized by driving the motor, the operation is simple and convenient, and manpower is saved.

Optionally, the lift assembly further includes a displacement sensor, the displacement sensor is arranged on the mounting bracket, the monitoring direction of the displacement sensor is facing the connection plate, and the displacement sensor is connected to the drive motor with electrical signals.

By adopting the above technical solution, when the second pipeline moves up and down, the electric signal of the displacement sensor can be used to control the driving motor to run forward and reverse, so as to realize the automatic in-position detection during the up and down movement of the second pipeline. The precision of the displacement when the two pistons move up and down improves the sealing of the conveying channel when water samples are drawn, and also improves the timeliness of discharging water samples from the conveying channel.

Optionally, the sampling mechanism further includes a connection assembly, the connection assembly includes a plurality of connection flanges, the plurality of connection flanges are arranged at intervals along the axial direction of the first pipeline, the inner wall of the connection flange is fixedly connected to the outer wall of the first pipeline, and the connection The outer wall of the flange abuts against the inner wall of the drill barrel.

By adopting the above technical solution, the connecting flange is provided on the outer wall of the first pipeline, which reduces the contact area between the outer wall of the first pipeline and the inner wall of the drill tube, thereby reducing the probability of the first pipeline getting stuck when it is inserted into the drill tube. The flange is arranged axially along the first pipeline, which also enhances the bending and torsional strength of the drill tube, and reduces the probability of damage to the drill tube when it is placed underground.

Optionally, the sampling mechanism also includes a limit assembly, the limit assembly includes a first limit block and a second limit block, the first limit block is arranged on the end face of the sealing cover, and the second limit block is arranged on the second pipe Above, the first limit block can abut against the second limit block.

By adopting the above technical solution, when an accident occurs during the downward movement of the second pipeline, the first limit block will abut against the second limit block, preventing the second pipeline from continuing to fall, reducing the malfunction of the second piston, and further Reduce the probability of non-specified depth water samples entering the conveying channel, thereby improving the accuracy of water sample detection.

In summary, the present invention includes at least one of the following beneficial technical effects:

By setting up the sampling mechanism, when it is necessary to extract groundwater, you only need to run the water intake component and transfer the collected water sample to the sampling bottle through the delivery component to complete the collection of groundwater water samples, because no pump is used to collect water samples The depth can exceed 10 meters, which increases the depth of groundwater collection and further expands the depth range of groundwater pollutant monitoring.

By setting up the sealing assembly, when the second pipeline moves up and down, the sealing assembly can meet the different requirements for the sealing assembly during the process of drawing water samples, discharging water samples and moving down the drill barrel, so that when the water sample is drawn, the delivery channel can be sealed , When the water sample is discharged, the conveying channel is opened in time, and when the drill barrel moves down, the seepage hole is closed in time to improve the accuracy of water sample collection.

By setting the lifting component, the second pipeline can move up and down automatically, the operation is simple and convenient, reducing the labor intensity of people, and at the same time improving the displacement accuracy and moving efficiency of the second pipeline running up and down, thereby improving the efficiency of groundwater sampling .

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of a monitoring device for groundwater pollutants;

Fig. 2 is the sectional view of A-A among Fig. 1;

Fig. 3 is an enlarged view at the B place of Fig. 1;

FIG. 4 is an enlarged view at point C of FIG. 2 .

Explanation of reference numerals: 100, drill barrel; 101, seepage hole; 102, water sample collection chamber; 103, drill bit; 210, delivery assembly; 211, first pipeline; 212, second pipeline; 2121, first through hole; 213, sealing cover; 2131, first threaded hole; 2132, second threaded hole; 214, water flow cut-off valve; 215, water outlet pipe; 216, first partition; 2161, second through hole; 217, second partition Plate; 2171, the fourth through hole; 218, delivery channel; 220, water intake assembly; 221, the first piston; 2211, the third through hole; 222, the first one-way valve; 223, the second one-way valve; 224, Connecting frame; 2241, the first installation hole; 225, connecting rod; 2251, the second installation hole; 226, the third check valve; 227, pin shaft; 228, lock nut; 230, drainage assembly; 231, gas vent Break valve; 232, intake pipe; 240, sealing assembly; 241, sealing ring; 242, second piston; 243, tapered sleeve; 2431, flow hole; 244, flexible rope; 250, lifting assembly; , motor mounting hole; 2512, bearing mounting hole; 252, connecting plate; 253, screw nut; 254, transmission screw; 255, coupling; 256, drive motor; 257, displacement sensor; 258, slewing bearing; 260, Connecting component; 261, connecting flange; 270, limiting component; 271, first limiting block; 272, second limiting block; 300, reciprocating drive member; 310, liquid level sensor.

Detailed ways

The present invention will be further described in detail below in conjunction with FIGS. 1-4 .

The embodiment of the present invention discloses a monitoring device for groundwater pollutants. Referring to FIG. 1, the monitoring device for groundwater pollutants includes: a drill pipe 100, a power mechanism (not shown in the figure) for placing the drill pipe 100 underground, and a sampling mechanism and a water sample detection module (not shown in the figure); the sampling mechanism includes a water intake assembly 220, a transport assembly 210 and a sampling bottle.

The drill barrel 100 is connected to the power mechanism in transmission, the delivery assembly 210 and the water intake assembly 220 are sequentially arranged in the drill barrel 100 from outside to inside, the sampling bottle is connected to the output end of the delivery assembly 210, and the water sample detection module is connected to the sampling bottle. When it is necessary to monitor groundwater pollutants at a specified depth, first run the power mechanism to drive the drill tube 100 into the specified depth underground, then run the water intake assembly 220 to extract groundwater samples, and the water samples are drawn into the sampling bottle through the delivery channel 218 for water sample detection The module detects and analyzes the water samples in the sampling bottle, and obtains the status of groundwater pollutants at a specified depth, thereby realizing the monitoring of groundwater pollutants.

Referring to Fig. 1, a drill bit 103 is provided at the bottom of the drill barrel 100, and a water seepage hole 101 is provided on the side wall of the lower end of the drill barrel 100. The sample collection cavity 102; the upper end of the drill bit 103 is connected with the power mechanism in transmission.

The conveying assembly 210 includes a first pipeline 211 and a second pipeline 212. The first pipeline 211 is coaxially threaded in the drill barrel 100. The upper end surface of the first pipeline 211 is higher than the upper end surface of the drill cylinder 100. The first pipeline 211 The lower end is located above the water seepage hole 101 of the drill pipe 100;

The sampling mechanism also includes a connection assembly 260, the connection assembly 260 includes a plurality of connection flanges 261, the connection flanges 261 are arranged on the first pipe 211 at equal intervals along the axial direction of the first pipe 211, and the inner walls of the connection flanges 261 Welded on the outer wall of the first pipe 211, while the outer wall of the connecting flange 261 abuts against the inner wall of the drill tube 100;

The sampling mechanism also includes a sealing assembly 240. The sealing assembly 240 includes a sealing ring 241. The outer wall of the sealing ring 241 is detachably fixed and bonded to the inner wall of the bottom end of the first pipeline 211 by hot-melt welding, and the sealing ring 241 is close to the seepage hole 101. One end of the seal ring 241 is flush with the bottom surface of the first pipe 211, and the inner diameter of the sealing ring 241 is equal to the outer diameter of the second pipe 212. The second pipe 212 is coaxially installed in the first pipe 211, and the The upper end surface is higher than the upper end surface of the first pipe 211 , and the lower end of the second pipe 212 is movably disposed in the sealing ring 241 .

A conveying channel 218 is formed between the first pipeline 211 and the second pipeline 212. A sealing cover 213 is arranged at the upper end of the conveying channel 218. The sealing cover 213 is sealed and connected to the upper end surface of the first pipeline 211 by bolts. There is a first threaded hole 2131, and the water flow shut-off valve 214 is threadedly connected in the first threaded hole 2131. One end of the water outlet pipe 215 is connected with the water flow shut-off valve 214, and the other end is connected with the sampling bottle.

Referring to FIG. 1 , the water intake assembly 220 includes a first piston 221 , a connecting rod 225 , a connecting frame 224 , a pin shaft 227 , a locking nut 228 and a reciprocating driving member 300 . The outer diameter of the first piston 221 is equal to the inner diameter of the second pipeline 212. The first piston 221 is slidably connected to the second pipeline 212. One end of the first piston 221 is welded to one end of the connecting frame 224, and the other end of the connecting frame 224 is provided with a first installation. hole 2241, and the axis of the first mounting hole 2241 is perpendicular to the axis of the first piston 221; the connecting rod 225 is coaxially penetrated in the second pipe 212, and the lower end of the connecting rod 225 is provided with a second mounting hole 2251, the second mounting hole 2251 is coaxial with the first mounting hole 2241, and the pin shaft passes through the second mounting hole 2251 and the first mounting hole 2241 in turn, and one end of the pin shaft 227 is provided with threads, and the lock nut 228 is screwed on the pin shaft 227, and the pin shaft 227 can rotate in the first mounting hole 2241 and the second mounting hole 2251 . The reciprocating drive 300 can be a hydraulic cylinder, an electric push cylinder or a linear motor, as long as it can drive the connecting rod 225 to move relative to the second pipeline 212; in the present invention, the reciprocating drive 300 is an electric push cylinder, The cylinder body of the electric push cylinder is fixedly connected on the connecting plate 252, and the upper end of the connecting rod 225 is fixedly connected on the push rod of the electric push cylinder.

Referring to Fig. 1, the second pipeline 212 includes a first partition 216 and a second partition 217, and the sealing assembly 240 also includes a conical sleeve 243; the first partition 216 and the second partition 217 are coaxially installed in the second pipeline 212, one end of the first partition 216 abuts against the lower end surface of the second pipe 212, and the other end abuts against the end with a larger diameter of the conical sleeve 243, and the axis of the conical sleeve 243 is coaxial with the axis of the first partition 216 , the conical sleeve 243 and the first partition 216 are both connected to the lower end of the second pipe 212 by bolts.

One end with a smaller diameter of the conical sleeve 243 is provided with a flow hole 2431, and the center of the end face of the first partition 216 is vertically provided with a second through hole 2161, and the flow hole 2431 communicates with the second through hole 2161; the second partition 217 is located at Directly above the first partition 216, the second partition 217 is provided with a fourth through hole 2171, the connecting rod 225 is passed through the fourth through hole 2171, and the second partition 217 is welded to the inner wall of the second pipe 212 , a first through hole 2121 is opened on the side wall of the second pipe 212, the first through hole 2121 is located between the first partition 216 and the second partition 217, and the first through hole 2121 makes the first pipe 211 and the second The pipeline 212 is connected; the first piston 221 slides between the first partition plate 216 and the second partition plate 217, and the center position of the first piston 221 is vertically provided with a third through hole 2211, the third through hole 2211 and the second through hole The hole 2161 is coaxial;

The water intake assembly 220 includes a first one-way valve 222, a second one-way valve 223, and a third one-way valve 226; the first one-way valve 222 is installed in the second through hole 2161, and the first one-way valve 222 The opening direction of the second one-way valve 223 is away from the water sample collection chamber 102; the second one-way valve 223 is penetrated in the first through hole 2121, and the opening direction of the second one-way valve 223 is close to the first pipeline 211;

And when the second one-way valve 223 is opened, water can flow from the first pipeline 211 to the second pipeline 212; the third one-way valve 226 is penetrated in the third through hole 2211, and the opening direction of the third one-way valve 226 is close to the second one-way valve. Partition 217.

When it is necessary to detect groundwater pollutants at a specified depth, the outer wall of the second pipeline 212 abuts against the inner wall of the sealing ring 241; then run the power mechanism, and the power mechanism will put the drill pipe 100 into the specified depth; then run the reciprocating drive member 300 to reciprocate The driving part 300 drives the first piston 221 to move up and down in the second pipeline 212. When the reciprocating driving part 300 drives the first piston 221 to move upward, the pressure between the first partition 216 and the first piston 221 is lower than the pressure of groundwater. The first one-way valve 222 is opened, and groundwater flows between the first partition 216 and the first piston 221; then the reciprocating drive 300 drives the first piston 221 to move downward, and the gap between the first partition 216 and the first piston 221 The pressure of the underground water is greater than the pressure between the first piston 221 and the second partition 217, at this time the third one-way valve 226 is opened, and the ground water flows to the top of the first piston 221; then the reciprocating driving member 300 drives the first piston 221 Run upwards again, the pressure between the first dividing plate 216 and the first piston 221 is less than the pressure of the groundwater, the first one-way valve 222 is opened, at this time the first one-way valve 222 is opened, and the groundwater flows to the first dividing plate 216 and The pressure between the first piston 221 and between the first piston 221 and the second partition 217 is greater than the pressure between the delivery channel 218, the second check valve 223 is opened, and the groundwater above the first piston 221 flows to the delivery channel. In the channel 218, it circulates back and forth until the groundwater flows into the sampling bottle through the water flow shut-off valve 214 and the outlet pipe 215; the extraction of groundwater samples is completed.

1, the sealing assembly 240 also includes a second piston 242 and a plurality of flexible ropes 244, the flexible ropes 244 are evenly arranged along the circumference of the second piston 242, one end of the flexible rope 244 is threaded on the conical sleeve 243, and the other end is threaded On the upper end surface of the second piston 242, the second piston 242 is located below the second pipe 212, and the outer diameter of the second piston 242 is equal to the inner diameter of the drill cylinder 100, and the second piston 242 is slidably connected to the drill cylinder along the axial direction of the drill cylinder 100. within 100.

Referring to Fig. 1, the sampling mechanism also includes a drainage assembly 230, and the drainage assembly 230 includes an air compressor (not shown), an air inlet pipe 232 and a gas on-off valve 231, the air compressor is arranged on the ground, and one end of the air inlet pipe 232 is connected to the The air compressor is connected, and the other end is connected with the gas on-off valve 231. The upper end surface of the sealing cover 213 is provided with a second threaded hole 2132. The shutoff valve 231 communicates with the delivery channel 218 .

When the drill barrel 100 goes deep into the ground, the second piston 242 always abuts against the position of the water seepage hole 101 of the drill barrel 100, and when the drill barrel 100 reaches a specified depth, the second pipe 212 is moved downward, so that the conical sleeve 243 pushes the first The second piston 242 moves down. When the second piston 242 is disengaged from the water seepage hole 101, the second pipe 212 is moved upward to make the second pipe 212 rotate to the initial position. At this time, the outer wall of the second pipe 212 abuts against the inner wall of the sealing ring 241. , and the flexible rope 244 is in a relaxed state; then the first piston 221 is operated to extract groundwater samples. Such setting can reduce the entry of groundwater at different depths into the water sample collection chamber 102 during the downward movement of the drill barrel 100 , thereby improving the accuracy of water sample collection. When the water sample is taken out, move the second pipe 212 upwards, keep the second piston 242 in place, and disengage the outer wall of the second pipe 212 from the inner wall of the sealing ring 241. At this time, the bottom end of the conical sleeve 243 is inserted into the sealing ring 241 , a gap is formed between the outer wall of the conical sleeve 243 and the sealing ring 241, and the remaining water sample in the delivery channel 218 flows out from the gap, and at this time, stop moving the second pipeline 212 upward; at the same time, run the air compressor, open the gas on-off valve 231, so that Compressed air flows in from the upper end of the conveying channel 218, so that after the pumping is completed, the water samples in the conveying channel 218 are discharged cleanly, so that what circulates in the conveying channel 218 is the water sample at the designated collection depth, which improves the quality of underground water collection. The accuracy of the sample; after the remaining water sample in the delivery channel 218 is discharged, continue to move the second pipeline 212 upwards. The tension of the flexible rope 244 moves up and down. When the second piston 242 is completely in contact with the water seepage hole 101, the second pipe 212 is moved downward. When the outer wall of the second pipe 212 abuts against the inner wall of the sealing ring 241 again , stop moving the second pipeline 212; at this time, the power mechanism can be operated to drive the drill tube 100 to move down again to reach another specified depth, and continue to collect groundwater samples. Such setting can reduce the probability of phase mixing in the process of collecting groundwater samples at different depths, thereby improving the accuracy of collecting water samples at different depths.

Referring to Fig. 1, the sampling mechanism also includes a lifting assembly 250, and the lifting assembly 250 includes a mounting bracket 251, a driving motor 256, a connecting plate 252, a slewing bearing 258, a driving screw 254, a screw nut 253 and a displacement sensor 257; one end of the mounting bracket 251 passes through Bolts are connected to the upper end of the first pipeline 211, and a motor installation hole 2511 and a bearing installation hole 2512 are coaxially opened on the mounting bracket 251, and the motor installation hole 2511 and the bearing installation hole 2512 are both coaxial with the second pipeline 212, and the output end of the drive motor 256 The drive motor 256 is connected to the mounting bracket 251 by bolts, the input end of the transmission screw rod 254 is connected to the output shaft of the drive motor 256 through a coupling 255, and the inner ring of the slewing bearing 258 is connected to the drive On the screw mandrel 254, the outer ring of the slewing bearing 258 is matched and connected on the inner wall of the bearing mounting hole 2512, and the end of the transmission screw mandrel 254 away from the input end is provided with a transmission screw thread, and the screw nut 253 is threaded and connected to the drive screw mandrel 254; the connecting plate 252 Open the screw nut 253 connecting hole, the screw nut 253 is set in the screw nut 253 connecting hole, the screw nut 253 is installed on the connecting plate 252 by bolts, and the connecting plate 252 is connected on the side wall of the second pipeline 212 by bolts; The sensor 257 is connected to the mounting bracket 251 by bolts, and the displacement sensor 257 is coplanar with the installation surface of the driving motor 256; Electrical signal connection.

When the second piston 242 needs to break away from the position of the water seepage hole 101, the driving motor 256 is operated at this time, the driving motor 256 drives the driving screw 254 to rotate, the driving screw 254 drives the screw nut 253 to move down, and the screw nut 253 drives the first screw nut 253 through the connecting plate 252. When the second pipe 212 moves down and the second piston 242 is completely separated from the water seepage hole 101, the electric signal of the displacement sensor 257 controls the driving motor 256, so that the driving motor 256 runs in the reverse direction, and then drives the second pipe 212 to move upward. When the pipeline 212 returns to the initial position, the displacement sensor 257 controls the drive motor 256 again with an electric signal to stop the drive motor 256, and then the first piston 221 is moved up and down to extract the water sample; when the water sample is extracted, it needs to be discharged and transported When there is residual water sample in the channel 218, the drive motor 256 is reversed at this time, and then the second pipeline 212 is moved upward. When the remaining water sample in the delivery channel 218 can be removed from the gap, the electric signal of the displacement sensor 257 controls the drive motor 256, the driving motor 256 is stopped, and the second pipeline 212 stops moving up; when the remaining water sample in the delivery channel 218 is discharged, the driving motor 256 is then reversed to make the second pipeline 212 continue to move upward. After the second piston 242 is completely in contact with the water seepage hole 101, the displacement sensor 257 again controls the drive motor 256 with an electric signal, so that the drive motor 256 rotates forward, and then drives the second pipeline 212 to move downward. When the second pipeline 212 returns to the initial position Afterwards, the displacement sensor 257 again controls the drive motor 256 with electrical signals, so that the drive motor 256 stops rotating, and the second pipeline 212 stops moving. Such setting enables the displacement sensor 257 to automatically control the forward and reverse operation of the driving motor 256, thereby realizing the automatic up and down movement of the second pipeline 212, improving the accuracy of the displacement of the second pipeline 212, and the operation process is simple and convenient, saving human labor strength.

Referring to Fig. 1, the sampling mechanism also includes a limit assembly 270, the limit assembly 270 includes a first limit block 271 and a second limit block 272, the first limit block 271 is bolted to the upper end surface of the sealing cover 213, the second The limiting block 272 is connected to the outer wall of the second limiting block 272 by bolts, and the first limiting block 271 is movably abutted against the second limiting block 272 .

When the second pipe 212 is moving up and down in an unexpected situation, causing the second pipe 212 to fall, the first limiting block 271 will abut against the second limiting block 272, reducing the probability of the second pipe 212 falling further, The safety of monitoring equipment usage is improved.

The implementation principle of the monitoring device for groundwater pollutants in the embodiment of the present invention is:

When it is necessary to detect groundwater pollutants at a specified depth, the power mechanism is operated, and the power mechanism puts the drill barrel 100 into the specified depth. At this time, the outer wall of the second pipe 212 abuts against the inner wall of the sealing ring 241; the second piston 242 completely abuts against the inner wall of the sealing ring 241 At the position of the seepage hole 101, and the flexible rope 244 is in a loose state; at this time, the drive motor 256 is operated, and the drive motor 256 drives the transmission screw 254 to rotate, and the drive screw 254 drives the nut 253 to move down, and the nut 253 passes through the connecting plate 252 Drive the second pipe 212 to move down, and then the conical sleeve 243 pushes the second piston 242 to move down. When the second piston 242 is completely separated from the water seepage hole 101, the electric signal of the displacement sensor 257 controls the driving motor 256, so that the driving motor 256 Run in the opposite direction, and then drive the second pipeline 212 to move up, so that the second pipeline 212 returns to the initial position, and the displacement sensor 257 controls the drive motor 256 again with an electrical signal, so that the drive motor 256 stops running, and then runs the reciprocating driver 300, reciprocating The driver 300 drives the first piston 221 to move up and down in the second pipeline 212, and alternately switches the first one-way valve 222, the second one-way valve 223 and the third one-way valve 226, so that the underground water sample enters the delivery channel 218. At the same time, the water flow cut-off valve 214 on the sealing cover 213 is in an open state, and then the water sample in the delivery channel 218 enters the sampling bottle through the outlet pipe 215 to complete the extraction of the groundwater sample; then the water sample detection module detects the water in the sampling bottle. Samples for pollutant monitoring and analysis. With such setting, the collection and monitoring of water samples below 10 meters can be realized, so that the collection depth of water samples is not limited by the pumping depth of the pump, and the application range of the groundwater pollutant monitoring device is improved.

When the water sample is extracted and the remaining water sample in the delivery channel 218 needs to be discharged, the drive motor 256 is driven in the reverse direction at this time, thereby driving the second pipeline 212 to move upward. When the remaining water sample in the delivery channel 218 can be discharged from the gap , the electric signal of the displacement sensor 257 controls the driving motor 256, so that the driving motor 256 stops running, and now the second pipeline 212 stops moving up; at the same time, the air compressor is operated, the gas on-off valve 231 is opened, and the water flow off-valve 214 is closed. Compressed air enters the conveying passage 218, and a liquid level sensor 310 is arranged on the inner wall of the drill pipe 100 and above the water seepage hole 101. When the liquid level sensor 310 cannot detect the presence of water, it proves that there is remaining water in the conveying passage 218. The water sample is discharged cleanly; when the remaining water sample in the conveying channel 218 is completely discharged, then the driving motor 256 is reversed to make the second pipeline 212 continue to move upwards. After the 242 is completely in contact with the seepage hole 101, the air compressor stops running, the gas on-off valve 231 is closed, and the displacement sensor 257 again controls the drive motor 256 with an electric signal, so that the drive motor 256 rotates forward, and then drives the second pipe 212 to move down , when the second pipeline 212 returns to the initial position, the displacement sensor 257 controls the drive motor 256 with electric signals again, so that the drive motor 256 stops rotating, and the second pipeline 212 stops moving. Such setting enables the displacement sensor 257 to automatically control the forward and reverse operation of the driving motor 256, thereby realizing the automatic up and down movement of the second pipeline 212, improving the accuracy of the displacement of the second pipeline 212, and the operation process is simple and convenient, saving human labor strength. By moving the second pipe 212 up and down, the automatic abutment and automatic disengagement between the second piston 242 and the water seepage hole 101 can be realized, and at the same time, the requirement that water cannot enter the water sample collection chamber 102 when the drill tube 100 moves down can also be achieved. When pumping water, the water seepage hole 101 needs to be connected with the water sample collection chamber 102, which not only meets the water pumping requirements, but also improves the accuracy of water sample extraction, thereby improving the monitoring accuracy of groundwater pollutants.

The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention, so: all equivalent changes made according to the structure, shape and principle of the present invention should be covered by the protection scope of the present invention Inside.

Claims (1)

1. A monitoring device for groundwater pollutants, characterized in that it includes a drill barrel (100), a power mechanism for placing the drill barrel (100) underground, a sampling mechanism (200) and a water sample detection module; the drill A water seepage hole (101) is opened on the side wall of the lower end of the barrel (100), and the inner cavity of the drill barrel (100) forms a water sample collection chamber (102) at the height of the water seepage hole (101); the power mechanism is connected to the drill barrel (100) by transmission; The sampling mechanism (200) includes a sampling bottle, a water intake assembly (220) and a delivery assembly (210). The sampling bottle is set on the ground, and the water intake assembly (220) includes a first piston (221), a connecting rod (225), a first A one-way valve (222), a second one-way valve (223), a third one-way valve (226) and a reciprocating drive member, the delivery assembly (210) includes a first pipeline (211) and a second pipeline (212), the first The pipe (211) is coaxially installed in the drill barrel (100), the outer wall of the first pipe (211) is connected with the inner wall of the drill barrel (100), the lower end of the first pipe (211) is located above the water sample collection chamber (102), and the second The two pipelines (212) are coaxially installed in the first pipeline (211), and the delivery channel (218) is formed between the first pipeline (211) and the second pipeline (212), and the bottom end of the delivery channel (218) is provided with a seal Assembly (240), the upper end of the delivery channel (218) is provided with a sealing cover (213), the sealing cover (213) is provided with an outlet pipe (215), and the outlet pipe (215) is connected to the sampling bottle; the lower end of the second pipe (212) A first partition (216), a second partition (217) and a first through hole (2121) are provided, the first partition (216) is connected to the lower end surface of the second pipe (212), and the first partition (216) is located above the water seepage hole (101), the first partition (216) is provided with a second through hole (2161), the axis of the second through hole (2161) is parallel to the axis of the first pipe (211), The first one-way valve (222) is set in the second through hole (2161), and the opening direction of the first one-way valve (222) is away from the water sample collection chamber (102); the second partition (217) is set at the second Above a partition (216), the first through hole (2121) is located between the first partition (216) and the second partition (217), and the first through hole (2121) is opened in the second pipe (212) On the side wall, the first through hole (2121) connects the first pipe (211) and the second pipe (212), and the second one-way valve (223) is installed in the first through hole (2121); the first piston (221) is coaxially arranged in the second pipe (212), and the first piston (221) slides between the first partition (216) and the first through hole (2121); There is a third through hole (2211), the axis of the third through hole (2211) is parallel to the axis of the first pipeline (211), the third one-way valve (226) is arranged in the third through hole (2211), and the third through hole (2211) The opening direction of the three one-way valves (226) is close to the first partition (216); one end of the connecting rod (225) is connected to the end of the first piston (221) away from the water sample collection chamber (102), and the other end is connected in a reciprocating drive On the part, the reciprocating drive part is arranged on the ground, and the water sample detection module is connected with the sampling bottle; the sealing assembly (240) includes a sealing ring (241), and the sealing ring (241) is coaxially arranged on the first pipe (211) Inside, the inner wall of the sealing ring (241) abuts against the outer wall of the second pipe (212), and the outer wall of the sealing ring (241) is fixedly connected with the inner wall of the first pipe (211); the second pipe (212) is drilled along the The barrel (100) is axially movably connected to the first pipe (211); the sampling mechanism (200) also includes a limit assembly (270), and the limit assembly (270) includes a first limit block (271) and a second limit block. Position block (272), the first limit block (271) is set on the end face of the sealing cover (213), the second limit block (272) is set on the second pipe (212), the first limit block (271) It can abut against the second limit block (272); the sampling mechanism (200) also includes a drainage assembly (230) for emptying the water sample in the delivery channel (218), and the drainage assembly (230) includes an air compressor, an air intake pipe (232) and the gas on-off valve (231), one end of the inlet pipe (232) is connected to the air compressor, and the other end is connected to the gas on-off valve (231), and the gas on-off valve (231) is arranged on the sealing cover (213) Above, the intake pipe (232) communicates with the conveying channel (218) through the gas on-off valve (231); the sealing assembly (240) also includes a second piston (242), and the second piston (242) is located on the sealing ring (241 ), the second piston (242) is coaxially arranged in the drill barrel (100), the outer wall of the second piston (242) is in contact with the outer wall of the drill barrel (100), and one end of the second piston (242) is in contact with the second pipe (212) The lower end is flexibly connected, and the height of the second piston (242) is greater than the height of the water seepage hole (101) on the drill barrel (100); the sealing assembly (240) also includes a conical sleeve (243), a conical sleeve The maximum diameter of (243) is equal to the outer diameter of the second pipe (212), and the larger diameter end of the conical sleeve (243) is coaxially connected to the lower end surface of the second pipe (212); the sampling mechanism (200) also includes a The lifting assembly (250) for lifting the second pipe (212), the lifting assembly (250) includes the mounting bracket (251), the driving motor (256), the connecting plate (252), the driving screw (254) and the screw nut (253) ; The mounting bracket (251) is connected to the upper end of the first pipe (211), the driving motor (256) is connected to the mounting bracket (251), and the driving motor (256) is located above the second pipe (212), and the connecting plate (252 ) is connected to the screw nut (253) at one end, and the second pipe (212) at the other end, the screw nut (253) is threaded on the drive screw (254), and one end of the drive screw (254) is connected to the drive motor (256) The output shaft is coaxially connected, and the other end is rotatably connected to the mounting bracket (251); the lifting assembly (250) also includes a displacement sensor (257), and the displacement sensor (257) is arranged on the mounting bracket (251), and the displacement sensor (257 ) is facing the connecting plate (252), and the displacement sensor (257) is connected to the drive motor (256) for electrical signals; the first piston (221) is hingedly connected to the connecting rod (225); the sampling mechanism ( 200) also includes a connection assembly (260), the connection assembly (260) includes a plurality of connection flanges (261), the plurality of connection flanges (261) are arranged at intervals along the axial direction of the first pipeline (211), and the connection flanges ( 261) The inner wall is fixedly connected to the outer wall of the first pipe (211), and the outer wall of the connecting flange (261) abuts against the inner wall of the drill barrel (100).

Images