A sampling device and sampling method for groundwater quality monitoring

Abstract

The present invention relates to the technical field of water quality sampling equipment, and provides a sampling device and a sampling method for groundwater quality monitoring, wherein a connecting rope is tied to the top of a sampling tube, and a water inlet hole ring is arranged on the upper section of the sampling tube; a water squeezing mechanism is sleeved on the outside of the sampling tube, and the water squeezing mechanism includes a slip ring, a water-absorbing sponge and a squeezing plate, the slip ring is sleeved on the outside of the sampling tube and is slidably connected thereto, one end of the squeezing plate is hinged to the slip ring, the water-absorbing sponge is arranged between the squeezing plate and the outer surface of the sampling tube, and a lifting rope is tied to the upper end of the squeezing plate; the water squeezing mechanism is driven to move upward to the water inlet hole ring by pulling up the lifting rope, the slip ring abuts against the top of the sampling tube, and the squeezing plate rotates toward one side of the sampling tube to squeeze the water-absorbing sponge, so that the water flows into the sampling tube along the water inlet hole ring. The present invention has the advantages of being convenient for collecting sufficient amount of samples when the water level of the sampling well is low, and the sand content of the samples in the sampling tube is low.

Description

Technical Field

[0001] The present invention relates to the technical field of water quality sampling equipment, and in particular to a sampling device and a sampling method for groundwater quality monitoring. Background Art

[0002] Groundwater refers to water stored in the pores of rocks below the ground. In a narrow sense, it refers to water in saturated aquifers below the groundwater surface. Groundwater is an important component of water resources. Due to its stable water volume and good water quality, it is one of the important water sources for agricultural irrigation, industry, mining and cities. However, under certain conditions, changes in groundwater can also cause adverse natural phenomena such as swamping, salinization, landslides and ground subsidence. The meteorological and hydrological characteristics of a region play an important role in studying rivers. Rivers are mostly channels for draining groundwater, and most rivers are rain-source rivers. In the rainy season, the flow rate increases sharply, the water level rises, and the shallow groundwater on both sides is replenished through lateral seepage. In the dry season, the river water is short-term dry. Therefore, it is necessary to judge the water quality and water level by regular sampling and testing of groundwater.

[0003] The groundwater sampler is a special tool for collecting water quality samples from groundwater bodies. It is widely used in environmental monitoring, water resource assessment, geological exploration, scientific research and teaching. Conventional samplers are hoisted into the sampling well and filled with a certain amount of water to take out. However, when the groundwater level is low (such as Figure 3 As shown in the figure, there is less water in the sampling well, and it is difficult to obtain a sufficient amount of water sample for testing in the sampling tube. If water is pumped out by pumping, the silt in the sedimentation tube will be brought up, which will easily muddy the water and the sampled water will also contain too much silt. Summary of the invention

[0004] The object of the present invention is to provide a sampling device and a sampling method for groundwater quality monitoring, which can collect enough sample water for detection when the water level in the sampling well is low.

[0005] The present invention is achieved through the following technical scheme: a sampling device for groundwater quality monitoring, comprising a sampling barrel, a connecting rope is tied to the top of the sampling barrel, and a water inlet ring is arranged on the upper section of the sampling barrel; a water squeezing mechanism is sleeved on the outside of the sampling barrel, the water squeezing mechanism comprises a slip ring, a water-absorbing sponge and a squeezing plate, the slip ring is sleeved on the outside of the sampling barrel and is slidably connected thereto, one end of the squeezing plate is hinged to the slip ring, the water-absorbing sponge is arranged between the squeezing plate and the outer surface of the sampling barrel, and a lifting rope is tied to the upper end of the squeezing plate; the water squeezing mechanism is driven to move up to the water inlet ring by pulling up the lifting rope, the slip ring abuts against the top of the sampling barrel, and the squeezing plate rotates toward one side of the sampling barrel to squeeze the water-absorbing sponge, so that the water discharged from the sponge flows into the sampling barrel along the water inlet ring.

[0006] Furthermore, it also includes an insert plate, a slot adapted to the insert plate is provided in the middle of the extrusion plate, and the insert plate is slidably connected to the slot; first water-permeable holes communicating with the slot are provided on both side end faces of the extrusion plate, the insert plate is provided with second water-permeable holes corresponding to the first water-permeable holes, and a reset spring connected to the insert plate is provided at the bottom of the slot.

[0007] Furthermore, it also includes a sealing member arranged between the slip ring and the sampling tube, the sealing member includes a bottom ring and sealing plates arranged on both sides of the bottom ring; the sealing plate is slidably connected to the slip ring, the sealing member moves up with the slip ring, the sealing plate presses against the water inlet hole ring, and the sealing plate is separated from the slip ring.

[0008] Furthermore, a clamping plate is provided on the inner side of the slip ring, and a sliding groove adapted to the clamping plate is provided on the surface of the sealing plate.

[0009] Furthermore, the slip ring is provided with a first magnetic attraction portion, and the bottom ring is provided with a second magnetic attraction portion corresponding to the first magnetic attraction portion.

[0010] Furthermore, the side end surfaces and the top surface of the water-absorbing sponge are provided with flexible skins that match their shapes.

[0011] Furthermore, a limiting protrusion is provided at the top of the sampling tube, and the slip ring is provided with at least one vertically arranged positioning plate. When the positioning plate abuts against the limiting protrusion, the water-absorbing sponge moves to the water inlet ring.

[0012] Furthermore, a guide hole through which the lifting rope passes is provided at the top of the sampling cylinder, and one end of the lifting rope is connected to a lifting plate.

[0013] Furthermore, a sponge base is provided at the bottom of the sampling tube.

[0014] A sampling method for a sampling device for groundwater quality monitoring, comprising the following steps:

[0015] S1, well washing: well washing is performed before sampling to remove most sediments and contaminants in the well;

[0016] S2, measuring water level and well depth: using water level meter and well depth measuring instrument to accurately measure groundwater level and well water depth, and obtain data feedback and combine with standards to determine whether the well is at a low water level;

[0017] S3, lowering the sampling device: dragging the sampling tube along the sampling well to the bottom of the well step by step through the connecting rope, and letting it stand for a while;

[0018] S4, pre-sampling and water collection: after the water-absorbing sponge and the sampling tube are close to the bottom of the well and the water-absorbing sponge is saturated with water, the pull rope is pulled upward to make the water-absorbing sponge move to the water inlet ring and press against it, and a certain pulling force is applied to squeeze the water out of the water-absorbing sponge and flow into the sampling tube, and then the pull rope is released, and the water squeezing mechanism falls to the bottom of the well under the action of gravity, and the water-absorbing sponge further absorbs water and squeezes it into the sampling tube again, and this is repeated twice to increase the weight of the sampling tube;

[0019] S5, completing sampling: when the water-absorbing sponge absorbs enough water, the pull rope is pulled again to pull the water-absorbing sponge to the water inlet ring, and a greater pulling force is applied to squeeze the water-absorbing sponge, so that it deforms more and more water flows into the sampling tube. This is repeated several times to load a sufficient amount of water sample into the sampling tube;

[0020] S6, Recover the sampling device: Pull the connecting rope vertically to bring the sampling device out of the sampling well, and pour the sampled water out from the water outlet of the sampling tube for inspection.

[0021] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0022] 3. There is less noise during the water extraction process, the mud and sand at the bottom of the well will not be stirred up too much, and the absorbent sponge has a certain filtering effect, which makes the sand content of the water sample in the sampling tube low, which is helpful for the accuracy of water quality detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of the sampling device for groundwater quality monitoring provided by an embodiment of the present invention when absorbing water at the bottom of a well;

[0025] Figure 2 for Figure 1 A local enlarged view of point A in FIG.

[0026] Figure 3 It is a schematic diagram of the structure when the sampling well in the present invention is at a low water level;

[0027] Figure 4 It is a schematic diagram of the structure of the sampling device for groundwater quality monitoring of the present invention when it is lifted up, squeezed and collected;

[0028] Figure 5 for Figure 4 A local enlarged view of point B in FIG.

[0029] Figure 6 It is a cross-sectional top view of the sampling device for groundwater quality monitoring in the present invention;

[0030] Figure 7 It is a front structural schematic diagram of the extruded plate in the present invention;

[0031] Figure 8 It is a schematic diagram of the connection structure between the slip ring and the sealing element in the present invention.

[0032] Icon: 1-sampling tube, 11-water inlet ring, 2-water squeezing mechanism, 21-slip ring, 211-card plate, 212-first magnetic suction part, 213-positioning plate, 22-water-absorbing sponge, 221-flexible leather, 23-squeezing plate, 231-first water permeable hole, 232-slot, 233-reset spring, 24-plug plate, 241-second water permeable hole, 3-connecting rope, 4-lifting rope, 5-seal, 51-bottom ring, 511-second magnetic suction part, 52-sealing plate, 521-slide, 6-limiting protrusion, 7-lifting plate, 8-sponge base, 9-sampling well. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] The following is further described in conjunction with specific embodiments. Figure 1-Figure 8As shown, this embodiment is a sampling device for groundwater quality monitoring, including a sampling tube 1, a connecting rope 3 is tied to the top of the sampling tube 1, and a water inlet ring 11 is arranged on the upper section of the sampling tube 1; a water squeezing mechanism 2, which is sleeved on the outside of the sampling tube 1, the water squeezing mechanism 2 includes a slip ring 21, a water-absorbing sponge 22 and a squeezing plate 23, the slip ring 21 is sleeved on the outside of the sampling tube 1 and is slidably connected thereto, one end of the squeezing plate 23 is hinged to the slip ring 21, the water-absorbing sponge 22 is arranged between the squeezing plate 23 and the outer surface of the sampling tube 1, and a pulling rope 4 is tied to the upper end of the squeezing plate 23; the water squeezing mechanism 2 is driven to move up to the water inlet ring 11 by pulling up the pulling rope 4, the slip ring 21 is against the top of the sampling tube 1, and the squeezing plate 23 rotates toward one side of the sampling tube 1 to squeeze the water-absorbing sponge 22, so that the water flows into the sampling tube 1 along the water inlet ring 11; specifically, the sampling device is suspended by the connecting rope 3 and placed in the sampling tube The pull rope 4 is lifted up and the water-absorbing sponge 22 is retracted to squeeze out the water.

[0037] like Figure 2 and Figure 5As shown, this embodiment also includes an insert plate 24, a slot 232 adapted to the insert plate 24 is provided in the middle of the squeezing plate 23, and the insert plate 24 is slidably connected to the slot 232; the end surfaces of both sides of the squeezing plate 23 are provided with first water-permeable holes 231 communicating with the slot 232, the insert plate 24 is provided with second water-permeable holes 241 corresponding to the first water-permeable holes 231, and the bottom of the slot 232 is provided with a reset spring 233 connected to the insert plate 24; the side end surface and the top surface of the water-absorbing sponge 22 are provided with a flexible skin 221 adapted to the shape thereof; specifically, the flexible skin 221 is made of impermeable material, and when the water squeezing mechanism 2 is at the bottom of the sampling tube 1, the water-absorbing sponge 22 When the first water permeable hole 231 and the second water permeable hole 241 coincide with each other, water can pass through the first water permeable hole 231 and the second water permeable hole 241 in sequence to be absorbed by the water-absorbing sponge 22. When the pulling rope 4 lifts the squeezing plate 23 again, it will drive the plug plate 24 to move out of the slot 232 for a certain displacement and limit the position, so that the first water permeable hole 231 and the second water permeable hole 241 are misaligned. Even if the water-absorbing sponge 22 is squeezed and deformed to a certain extent, its water loss can be reduced, ensuring that relatively more water can flow into the sampling tube 1 with a single squeezing of the water-absorbing sponge 22; the reset spring 233 can pull the plug plate 24 back into the slot 232 to avoid getting stuck.

[0038] like Figure 4 , Figure 6 , Figure 7 and Figure 8 As shown, based on the above technology, this embodiment also includes a sealing member 5 arranged between the slip ring 21 and the sampling tube 1, and the sealing member 5 includes a bottom ring 51 and sealing plates 52 arranged on both sides of the bottom ring 51; the sealing plate 52 is slidably connected to the slip ring 21, and the sealing member 5 moves upward with the slip ring 21, and the sealing plate 52 abuts against the water inlet hole ring 11, and the sealing plate 52 is separated from the slip ring 21; specifically, in order to further improve the water retention capacity of the water-absorbing sponge 22, during the upward movement of the water squeezing mechanism 2, the first water permeable hole 231 and the second water permeable hole 241 are misaligned, so that the water leakage is small, and the water absorption is The other surfaces of the sponge 22 are covered with a waterproof flexible skin 221, which can deform synchronously with the squeezing deformation of the water-absorbing sponge 22. The sealing plate 52 is located between the water-absorbing sponge 22 and the sampling tube 1 for isolation. The water-absorbing sponge 22 and the sealing plate 52 have a high surface fit and a small gap. When the top of the sealing plate 52 is against the water inlet ring 11, the contact between the sealing plate 52 and the water-absorbing sponge 22 is separated, and the water squeezed out of the water-absorbing sponge 22 enters the sampling tube 1 only through the gap between the water-absorbing sponge 22 and the water inlet ring 11.

[0039] Reference Figure 4 and Figure 8As shown, a card plate 211 is provided on the inner side of the slip ring 21, and a slide groove 521 adapted to the card plate 211 is provided on the surface of the sealing plate 52; the slip ring 21 is provided with a first magnetic attraction portion 212, and the bottom ring 51 is provided with a second magnetic attraction portion 511 corresponding to the first magnetic attraction portion 212; specifically, when the water-absorbing sponge 22 is squeezing water, the card plate 211 contacts the top of the slide groove 521, and after squeezing water, the slip ring 21 moves downward, the card plate 211 will contact the bottom of the slide groove 521, and the first magnetic attraction portion 212 will be attracted to the second magnetic attraction portion 511, so that when the water squeezing mechanism 2 moves upward, the slip ring 21 can move upward synchronously with the bottom ring 51, and only when the sealing plate 52 is against the water inlet ring 11, the pulling force of the pull rope 4 pulls and separates the first magnetic attraction portion 212 and the second magnetic attraction portion 511.

[0040] like Figure 4 As shown, a limiting protrusion 6 is provided at the top of the sampling tube 1, and the slip ring 21 is provided with at least one vertically arranged positioning plate 213. When the positioning plate 213 abuts against the limiting protrusion 6, the water-absorbing sponge 22 moves to the water inlet hole ring 11; specifically, when the positioning plate 213 abuts against the limiting protrusion 6, the water-absorbing sponge 22 and the water inlet hole ring 11 are basically in the same horizontal position. On this basis, if the pulling rope 4 continues to be pulled up, it will drive the squeezing plate 23 to squeeze the water-absorbing sponge 22 out of the water.

[0041] like Figure 1 As shown, a guide hole for the lifting rope 4 to pass through is provided at the top of the sampling tube 1, more than one water-absorbing sponge 22 is provided on the slip ring 21, and one end of the lifting rope 4 is connected to the lifting plate 7, and there are several lifting ropes 4, corresponding to multiple water-absorbing sponges 22 to increase the amount of water collected each time and improve the water collection efficiency. A rope parallel to the connecting rope 3 is connected to the lifting plate 7, one end of which extends to the outside of the sampling well 9, and the rope is reciprocated and alternately retracted and released.

[0042] In order to prevent the sampling device from having too much impact and muddying the mud at the bottom of the well when it is first placed in the sampling well 9, a sponge base 8 is provided at the bottom of the sampling tube 1. When the sampling tube 1 is slowly lowered, the sponge base 8 has a certain buffering and floating effect, causing it to slowly sink to the bottom of the well.

[0043] A sampling method for a sampling device for groundwater quality monitoring, comprising the following steps:

[0044] S1, well washing: well washing is performed before sampling to remove most sediments and contaminants in the well;

[0045] S2, measuring water level and well depth: using water level meter and well depth measuring instrument to accurately measure groundwater level and well water depth, and obtain data feedback and combine with standards to determine whether the well is at a low water level;

[0046] S3, lowering the sampling device: dragging the sampling tube 1 along the sampling well 9 gradually to the bottom of the well through the connecting rope 3, and letting it stand for a while;

[0047] S4, pre-sampling and water collection: after the water-absorbing sponge 22 and the sampling tube 1 are close to the bottom of the well and the water-absorbing sponge 22 is saturated with water, the lifting rope 4 is pulled upward to make the water-absorbing sponge 22 move to the water inlet ring 11 and press against it, and a certain pulling force is applied to squeeze the water out of the water-absorbing sponge 22 and flow into the sampling tube 1, and then the lifting is released, and the water squeezing mechanism 2 falls to the bottom of the well under the action of gravity, and the water-absorbing sponge 22 further absorbs water and squeezes into the sampling tube 1 again, and this is repeated twice to increase the weight of the sampling tube 1;

[0048] S5, sampling is completed: when the water-absorbing sponge 22 absorbs enough water, the pull rope 4 is pulled again to pull the water-absorbing sponge 22 to the water inlet ring 11, and a greater pulling force is applied to squeeze the water-absorbing sponge 22, so that it deforms more and more water flows into the sampling tube 1. This is repeated several times to load a sufficient amount of water sample into the sampling tube 1;

[0049] S6, recovering the sampling device: pulling the connecting rope 3 vertically to bring the sampling device out of the sampling well 9, and pouring the sampled water out from the water outlet of the sampling tube 1 for inspection.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sampling device for groundwater quality monitoring, characterized in that: It comprises a sampling tube (1), the top of which is tied with a connecting rope (3), and the upper section of which is provided with a water inlet ring (11); A water squeezing mechanism (2) is sleeved on the outside of the sampling tube (1), and the water squeezing mechanism (2) comprises a slip ring (21), a water-absorbing sponge (22) and a squeezing plate (23). The slip ring (21) is sleeved on the outside of the sampling tube (1) and is slidably connected thereto. One end of the squeezing plate (23) is hinged to the slip ring (21). The water-absorbing sponge (22) is arranged between the squeezing plate (23) and the outer surface of the sampling tube (1). A pulling rope (4) is attached to the upper end of the squeezing plate (23); By pulling up the pull rope (4), the water squeezing mechanism (2) is driven to move upward to the water inlet ring (11), the slip ring (21) abuts against the top of the sampling tube (1), and the squeezing plate (23) rotates toward one side of the sampling tube (1) to squeeze the water-absorbing sponge (22), so that the water flows into the sampling tube (1) along the water inlet ring (11); It also comprises an inserting plate (24), a slot (232) adapted to the inserting plate (24) is provided in the middle of the extrusion plate (23), and the inserting plate (24) is slidably connected to the slot (232); The end surfaces of both sides of the extrusion plate (23) are provided with first water-permeable holes (231) communicating with the slot (232); the plug plate (24) is provided with second water-permeable holes (241) corresponding to the first water-permeable holes (231); and the bottom of the slot (232) is provided with a return spring (233) connected to the plug plate (24); It also includes a sealing member (5) disposed between the slip ring (21) and the sampling tube (1), wherein the sealing member (5) includes a bottom ring (51) and sealing plates (52) disposed on both sides of the bottom ring (51); The sealing plate (52) is slidably connected to the sliding ring (21), and the sealing member (5) moves upward along with the sliding ring (21). When the sealing plate (52) abuts against the water inlet hole ring (11), the sealing plate (52) is separated from the sliding ring (21).

2. The sampling device for groundwater quality monitoring according to claim 1, characterized in that: A clamping plate (211) is provided on the inner side of the slip ring (21), and a sliding groove (521) adapted to the clamping plate (211) is provided on the surface of the sealing plate (52).

3. The sampling device for groundwater quality monitoring according to claim 2, characterized in that: The slip ring (21) is provided with a first magnetic attraction portion (212), and the bottom ring (51) is provided with a second magnetic attraction portion (511) corresponding to the first magnetic attraction portion (212).

4. The sampling device for groundwater quality monitoring according to claim 3 is characterized in that: The side end surface and the top surface of the water-absorbing sponge (22) are provided with a flexible skin (221) that matches the shape thereof.

5. The sampling device for groundwater quality monitoring according to claim 1, characterized in that: The top of the sampling tube (1) is provided with a limiting protrusion (6), and the slip ring (21) is provided with at least one vertically arranged positioning plate (213). When the positioning plate (213) abuts against the limiting protrusion (6), the water-absorbing sponge (22) moves to the water inlet hole ring (11).

6. The sampling device for groundwater quality monitoring according to claim 1, characterized in that: The top of the sampling cylinder (1) is provided with a guide hole through which the lifting rope (4) passes, and one end of the lifting rope (4) is connected to a lifting plate (7).

7. The sampling device for groundwater quality monitoring according to claim 1, characterized in that: A sponge base (8) is provided at the bottom of the sampling tube (1).

8. A sampling method based on the sampling device for groundwater quality monitoring according to any one of claims 1 to 7, characterized in that: The steps include: S1, well washing: well washing is performed before sampling to remove most sediments and contaminants in the well; S2, measuring water level and well depth: using water level meter and well depth measuring instrument to accurately measure groundwater level and well water depth, and obtain data feedback and combine with standards to determine whether the well is at a low water level; S3, lowering the sampling device: dragging the sampling tube (1) along the sampling well (9) step by step to the bottom of the well by means of the connecting rope (3), and letting it stand for a period of time; S4, pre-sampling and water collection: after the water-absorbing sponge (22) and the sampling tube (1) are close to the bottom of the well and the water-absorbing sponge (22) is saturated with water, the pulling rope (4) is pulled upward to move the water-absorbing sponge (22) to the water inlet ring (11) and to press against it, and a certain pulling force is applied to squeeze the water out of the water-absorbing sponge (22) and flow into the sampling tube (1), and then the pulling and lifting are released, and the water squeezing mechanism (2) falls to the bottom of the well under the action of gravity, and the water-absorbing sponge (22) further absorbs water and squeezes it into the sampling tube (1) again, and this is repeated twice to increase the weight of the sampling tube (1); S5, completing the sampling: when the water-absorbing sponge (22) absorbs enough water, the pull rope (4) is pulled again to pull the water-absorbing sponge (22) to the water inlet ring (11), and a greater pulling force is applied to squeeze the water-absorbing sponge (22), so that the deformation is greater and more water flows into the sampling tube (1). This is repeated several times to load a sufficient amount of water sample into the sampling tube (1); S6, recovering the sampling device: pulling the connecting rope (3) vertically to bring the sampling device out of the sampling well (9), and pouring the sampled water out from the water outlet of the sampling tube (1) for inspection.

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