Underground water sampling instrument

Abstract

The utility model discloses an underground water sampling instrument. The underground water sampling instrument comprises a fixed seat, a sampling rod and a reinforcing rod, the fixing base comprises a supporting frame and a driving assembly arranged on the supporting frame, the sampling rod is connected to the driving assembly, and the sampling rod can be driven by the driving assembly to move relative to the supporting frame in the vertical direction. The driving assembly is arranged, so that more labor is saved in the process that the sampling rod goes deep into the sediment. An opening is formed in one end of the sampling rod, a permeable hole is formed in the other end of the sampling rod, the sampling rod is provided with a cavity extending in the direction parallel to the rotating axis, and the cavity is communicated with the opening and the permeable hole. And underground water can enter the cavity through the water permeable holes and is collected so as to be conveniently collected by geological survey personnel. The reinforcing rod is separably accommodated in the cavity, so that the structural strength of the sampling rod is improved. One end, close to the water permeable hole, of the reinforcing rod is configured to block the water permeable hole, so that sediments are prevented from entering the cavity through the water permeable hole when the sampling rod goes deep into the sediments.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogeological exploration, in particular to a groundwater sampling instrument. Background Art

[0002] Since field work often involves the collection of groundwater samples, it is particularly difficult to collect in-situ groundwater samples at different depths in the field. Under the combined action of sediment compaction and groundwater pressure, existing instruments all insert the instrument into the sediment by the strength of the palm and arm for several centimeters to dozens of centimeters, and can only collect groundwater samples at the corresponding depths. Currently, simple instruments are very difficult to collect groundwater samples at a depth of 1-2 meters or even deeper. Based on this, it is necessary to design a device that can collect deeper groundwater samples. Summary of the Utility Model

[0003] The main purpose of the utility model is to propose a groundwater sampling instrument, aiming to solve the technical problem of how to collect deeper groundwater.

[0004] To achieve the above object, the utility model proposes a groundwater sampling instrument, including:

[0005] A fixed seat, including a support frame and a driving component arranged on the support frame;

[0006] A sampling rod, connected to the driving component, and the sampling rod is configured to be able to move relative to the support frame in the vertical direction under the drive of the driving component. One end of the sampling rod is provided with an opening, and the other end is provided with a water permeable hole. The sampling rod also has a cavity, and the cavity communicates with the opening and the water permeable hole;

[0007] A reinforcing rod, detachably accommodated in the cavity, and one end of the reinforcing rod close to the water permeable hole is configured to be able to block the water permeable hole.

[0008] In some embodiments, the sampling rod includes a main body portion and a conical head portion connected to the main body portion. The water permeable hole is located on the circumferential side of one end of the main body portion close to the conical head portion, and the cavity is located in the main body portion. The reinforcing rod can be inserted into the cavity through the opening and abutted against the conical head portion.

[0009] In some embodiments, the main body portion is provided with a plurality of water permeable holes distributed on the circumferential side around the rotation axis. The extending direction of the water permeable hole intersects with the radial direction of the cavity, and the extending direction of the water permeable hole inclines towards the movement direction of the sampling rod.

[0010] In some embodiments, hinge teeth are arranged around the periphery of the main body portion. The driving assembly includes a transmission member that meshes with the hinge teeth. When the driving assembly rotates, the main body portion moves relative to the transmission member in the vertical direction.

[0011] In some embodiments, the driving assembly further includes a rocker that is connected to the transmission member. The rocker is configured to be driven to rotate about an axis perpendicular to the rotation axis, thereby driving the main body portion to move relative to the transmission member in the vertical direction.

[0012] In some embodiments, the groundwater sampling instrument further includes a sampling assembly that includes a conduit, a peristaltic pump, and a water collection bottle. The conduit is configured to be able to communicate the cavity and the water collection bottle. The peristaltic pump is disposed between the cavity and the water collection bottle and is connected to the conduit. The peristaltic pump is configured to be able to introduce the groundwater in the cavity into the conduit.

[0013] In some embodiments, the sampling assembly further includes a stop valve that is disposed in the conduit and is located between the peristaltic pump and the water collection bottle. The stop valve is configured to be able to connect or disconnect the cavity and the water collection bottle.

[0014] In some embodiments, mud blocking teeth are provided on the peripheral wall of one end of the reinforcing rod close to the water permeable hole. The mud blocking teeth are configured to be spirally wound around the reinforcing rod. A guiding groove is provided on the peripheral wall of one side of the sampling rod close to the cavity. The water permeable hole communicates with the guiding groove. The guiding groove is configured to be spirally wound in the cavity, and the spiral direction of the guiding groove is the same as the spiral direction of the mud blocking teeth. The mud blocking teeth are configured to be able to mesh with the guiding groove, and the spiral direction of the guiding groove is the same as the rotation direction of the sampling rod.

[0015] In some embodiments, mud blocking teeth are provided on the peripheral wall of one end of the reinforcing rod close to the water permeable hole. The mud blocking teeth extend in the vertical direction. A guiding groove is provided on the peripheral wall of one side of the sampling rod close to the cavity. The guiding groove extends in the vertical direction, and the water permeable hole communicates with the guiding groove. The mud blocking teeth are configured to be able to be clamped in the guiding groove.

[0016] Compared with the prior art, the beneficial effects of the present utility model are:

[0017] In the technical solution of the present utility model, the groundwater sampling instrument includes a fixing base, a sampling rod and a reinforcing rod. Among them, the fixing base includes a support frame and a driving assembly disposed on the support frame. The sampling rod is connected to the driving assembly, and the sampling rod can move relative to the support frame in the vertical direction under the drive of the driving assembly. The setting of the driving assembly makes it more labor-saving in the process of the sampling rod penetrating into the sediment, avoiding the situation of sampling failure caused by insufficient penetration distance of the sampling instrument when the sampling instrument is penetrated into the sediment by the strength of the palm and arm in the related art. One end of the sampling rod is provided with an opening, and the other end is provided with a water-permeable hole. The sampling rod has a cavity extending in a direction parallel to the rotation axis, and the cavity communicates with the opening and the water-permeable hole. Groundwater can enter the cavity through the water-permeable hole and gather for geological survey personnel to collect. Among them, the reinforcing rod is detachably accommodated in the cavity. Thus, when the sampling rod penetrates into the sediment, the reinforcing rod can improve the structural strength of the sampling rod and reduce the probability of the sampling rod being damaged. In addition, one end of the reinforcing rod close to the water-permeable hole is configured to be able to block the water-permeable hole, thereby avoiding the problem that sediment enters the cavity through the water-permeable hole during the process of the sampling rod penetrating into the sediment, resulting in the inability of groundwater to enter the cavity after the reinforcing rod is pulled out of the cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0019] Figure 1 It is a schematic structural diagram of a groundwater sampling instrument in an embodiment of the present utility model;

[0020] Figure 2 It is a cross-sectional view of a groundwater sampling instrument in an embodiment of the present utility model;

[0021] Figure 3 It is a schematic structural diagram of a sampling rod in an embodiment of the present utility model;

[0022] Figure 4 For a cross-sectional view of the sampling rod in an embodiment of the present utility model along Figure 3 the A-A direction in; wherein, the sampling rod is provided with a guide groove;

[0023] Figure 5 For a cross-sectional view of the sampling rod in another embodiment of the present utility model along Figure 3 the A-A direction in; wherein, the extending direction of the water-permeable hole intersects with the rotation axis of the sampling rod and the radial direction of the cavity;

[0024] Figure 6 In one embodiment of the utility model, the sampling rod is along Figure 3 Sectional view cut along the BB direction;

[0025] Figure 7 This is a schematic diagram of the structure of a reinforcing rod in one embodiment of the utility model;

[0026] Figure 8 This is a schematic diagram of a collection component in an embodiment of the utility model;

[0027] Figure 9 It is a schematic flow chart of a groundwater stratified sampling method in one embodiment of the utility model.

[0028] Description of Figure Numbers:

[0029] Groundwater sampling instrument 100;

[0030] Fixed seat 110; support frame 111; driving assembly 112; transmission member 1121; rocker 1122;

[0031] Sampling rod 120; water permeable hole 121; cavity 122; body 123; hinge teeth 1231; cone head 124; guide groove 125;

[0032] Reinforcement rod 130; mud guard tooth 131;

[0033] Collection component 140; catheter 141; peristaltic pump 142; water collection bottle 143; water stop valve 144.

[0034] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] See also Figures 1 to 8, a first aspect of the present utility model provides a groundwater sampling instrument 100, which includes a fixed seat 110, a sampling rod 120, and a reinforcing rod 130. Among them, the fixed seat 110 includes a support frame 111 and a driving assembly 112 disposed on the support frame 111. The sampling rod 120 is connected to the driving assembly 112, and the sampling rod 120 is configured to be able to move relative to the support frame 111 in the vertical direction under the drive of the driving assembly 112, so that the sampling rod 120 can penetrate into the sediment to sample groundwater. Among them, the support frame 111 can support the sampling rod 120 and the driving assembly 112, and the support frame 111 can play a guiding role during the process of the sampling rod 120 penetrating into the sediment, avoiding the situation that the sampling rod 120 is skewed during the process of the sampling rod 120 penetrating into the sediment, and reducing the error related to the sampling depth that may occur during the process of the sampling rod 120 penetrating into the sediment. The support frame 111 includes a first support portion for fixing the driving assembly 112 and a second support portion for stably placing the entire support frame 111 on the ground surface. The second support portion can be configured as a hollow cylindrical shape, and the sampling rod 120 passes through the second support portion. In some embodiments, the driving assembly 112 is configured to be able to drive the sampling rod 120 to move in the vertical direction so as to penetrate into the sediment. In other embodiments, the driving assembly 112 is configured to be able to drive the sampling rod 120 to rotate and move in the vertical direction so as to penetrate into the sediment. The setting of the driving assembly 112 makes the process of the sampling rod 120 penetrating into the sediment more labor-saving, avoiding the excessive fatigue of geological surveyors during long-term sampling, thereby improving the groundwater sampling efficiency. In addition, the driving assembly 112 can provide a greater force to the sampling rod 120 than the arm, so that the sampling rod 120 can penetrate into the sediment more quickly. Specifically, in the scenario where the sampling rod 120 needs to be inserted into deeper sediment or encounters hard sediment, the arm strength may not be sufficient to complete the groundwater sampling task, and the setting of the driving assembly 112 can enable the sampling rod 120 to penetrate into the sediment easily and quickly. And the setting of the driving assembly 112 can also avoid accidental injuries (such as sprains, strains, etc.) caused by insufficient arm strength or improper operation of the sampling instrument by geological surveyors. In addition, during the process of penetrating the sampling rod 120 into the sediment, the depth and angle of the sampling rod 120 penetrating into the sediment can be accurately controlled by controlling the driving parameters of the driving assembly 112 for the sampling rod 120, thereby improving the sampling quality of groundwater.

[0037] Please refer to Figure 3 and Figure 6, one end of the sampling rod 120 is provided with an opening, and the other end is provided with a water permeable hole 121. The sampling rod 120 has a cavity 122, and the cavity 122 communicates with the opening and the water permeable hole 121. The reinforcing rod 130 is configured to be detachably received in the cavity 122, and one end of the reinforcing rod 130 close to the water permeable hole 121 is configured to be able to block the water permeable hole 121. When the sampling rod 120 is driven by the driving assembly 112 to penetrate into the sediment, the reinforcing rod 130 can increase the structural strength of the sampling rod 120, make up for the insufficient structural strength of the sampling rod 120 caused by the setting of the cavity 122 and the water permeable hole 121, and reduce the probability that the sampling rod 120 is damaged by the sediment during the process of penetrating into the sediment. The reinforcing rod 130 can block the water permeable hole 121, thereby reducing the probability that sediment enters the cavity 122 through the water permeable hole 121 during the process of the sampling rod 120 penetrating into the sediment, resulting in the inability of groundwater to enter the cavity 122. When the sampling rod 120 penetrates into the sediment and reaches the expected sampling position, the reinforcing rod 130 is withdrawn from the cavity 122. Then, groundwater can be collected in the cavity 122 through the water permeable hole 121, facilitating groundwater sampling by geological survey personnel. It should be noted that when the sampling rod 120 penetrates into the sediment and reaches the expected sampling position, the reinforcing rod 130 is withdrawn from the cavity 122, and the sampling rod 120 is still inserted into the sediment, thus playing a supporting role for the sediment at the pre-sampling position and preventing the pre-sampling position from being blocked due to sediment collapse, resulting in sampling failure. Compared with the sampling instruments in the related art, the groundwater sampling instrument 100 of the present application can quickly and labor-savingly collect groundwater deeper in the sediment.

[0038] Please refer to Figure 2 and Figure 3 , in some embodiments, the sampling rod 120 includes a main body portion 123 and a tapered head portion 124 connected to the main body portion 123. Among them, the main body portion 123 can be in the shape of a hollow cylinder, and the tapered head portion 124 is in the shape of a solid cone. When the sampling rod 120 contacts the sediment, the end of the tapered head portion 124 away from the main body portion 123 has a small contact area with the sediment, and it can be more easily inserted into the sediment. As the sampling rod 120 continuously penetrates into the sediment, the sediment flows around under the action of the sampling rod 120. The setting of the tapered head portion 124 makes part of the force received by the sediment be converted into a force perpendicular to the ground during the process of the sampling rod 120 penetrating into the sediment, thereby promoting the fluidity of the sediment, reducing the resistance of the sediment to the sampling rod 120, and further enabling the sampling rod 120 to more easily penetrate into the sediment. To reduce the probability of sediment entering the cavity 122 through the water permeable hole 121, the water permeable hole 121 can be provided on the circumferential side of one end of the main body portion 123 close to the tapered head portion 124, and the cavity 122 is located in the main body portion 123. Then, the reinforcing rod 130 can be inserted into the cavity 122 through the opening and abutted against the tapered head portion 124.

[0039] The main body 123 is provided with a plurality of water-permeable holes 121 distributed on the circumferential side around the rotation axis. The extending direction of the water-permeable holes 121 intersects with the radial direction of the cavity 122, and the extending direction of the water-permeable holes 121 is inclined towards the moving direction of the sampling rod 120. The driving assembly 112 can drive the sampling rod 120 to rotate around the rotation axis and move in the vertical direction. In some embodiments, please refer to Figure 5 , the water-permeable holes 121 extend towards the rotation axis and the rotation direction of the sampling rod 120. In other embodiments, the water-permeable holes 121 extend from the outside of the sampling rod 120 towards the rotation axis and the rotation direction of the sampling rod 120 while extending in the vertical direction. When the sampling rod 120 rotates and moves in the vertical direction, since the axis of the opening of the water-permeable hole 121 on the outside of the sampling rod 120 is neither perpendicular to the rotation axis nor perpendicular to the radial direction of the sampling rod 120, the sediment is pushed towards the outside of the sampling rod 120 under the action of the centrifugal force generated by the rotation of the sampling rod 120, and the axis of the opening of the water-permeable hole 121 on the outside of the sampling rod 120 is inclined towards the rotation direction of the sampling rod 120, thereby reducing the risk of blockage caused by the sediment entering the water-permeable hole 121. In addition, compared with arranging the water-permeable hole 121 on the conical head 124, arranging the water-permeable hole 121 on the main body 123 can avoid weakening the structural strength of the conical head 124 and affecting the service life of the sampling rod 120.

[0040] In some embodiments, please refer to Figure 3, a hinge tooth 1231 is wound around the peripheral side of the main body part 123. The driving assembly 112 includes a transmission part 1121, and the transmission part 1121 meshes with the hinge tooth 1231. When the driving assembly 112 rotates, the main body part 123 moves relative to the transmission part 1121 in the vertical direction. In some embodiments, the hinge tooth 1231 is spirally wound around the peripheral side of the main body part 123. The transmission part 1121 can be configured as a worm gear structure. Thus, the sampling rod 120 provided with the hinge tooth 1231 is similar to a worm structure. When the transmission part 1121 meshes with the hinge tooth 1231 and rotates, the sampling rod 120 can rotate with the rotation of the transmission part 1121 and the sampling rod 120 moves in the vertical direction under the cooperation of the hinge tooth 1231 and the transmission part 1121. It should be noted that a motor can be used to drive the transmission part 1121 to rotate. In some embodiments, the main body part 123 includes a water-permeable part and a transmission part. One end of the water-permeable part is connected to the conical head part 124, and the other end is connected to the transmission part. The water-permeable hole 121 is located in the water-permeable part, and the hinge tooth 1231 is located in the transmission part. When the sampling rod 120 penetrates into the sediment, the hinge tooth 1231 can reduce the resistance when the sampling rod 120 screws into the sediment, make the screwing-in process smoother, and improve the construction efficiency. The structure of the hinge tooth 1231 makes the sediment easier to be compressed and pushed during the process of the sampling rod 120 screwing in, thereby accelerating the screwing-in speed of the sampling rod 120, and further improving the sampling efficiency. In other embodiments, the hinge tooth 1231 is arranged in a rack shape along the vertical direction on the main body part 123, and the transmission part 1121 can adopt a gear structure. When the transmission part 1121 rotates, the sampling rod 120 connected to the transmission part 1121 through the hinge tooth 1231 can move in the vertical direction, so as to penetrate into the sediment.

[0041] Please refer to Figure 1 and Figure 2 , the driving assembly 112 further includes a rocker 1122. The rocker 1122 is connected to the transmission part 1121. The rocker 1122 is configured to be able to rotate around an axis perpendicular to the rotation axis when driven, so as to drive the main body part 123 to move relative to the transmission part 1121 in the vertical direction. In some embodiments, the rocker 1122 is configured to be held by an operator. In other embodiments, the rocker 1122 is configured to be able to connect to an external driving structure. The number of turns of rotation of the rocker 1122 is configured to have a certain proportional relationship with the distance that the sampling rod 120 moves in the vertical direction. Thus, geological survey personnel can control the number of turns of rotation of the rocker 1122 according to the depth of the groundwater to be collected, so that the depth accuracy of the collected groundwater samples is higher.

[0042] Please refer to Figure 8, the groundwater sampling instrument 100 further includes a collection assembly 140. The collection assembly 140 includes a conduit 141, a peristaltic pump 142, and a water collection bottle 143. The conduit 141 is configured to be able to communicate with the cavity 122 and the water collection bottle 143. The peristaltic pump 142 is disposed between the cavity 122 and the water collection bottle 143, and the peristaltic pump 142 is connected to the conduit 141. The peristaltic pump 142 is configured to be able to introduce the groundwater in the cavity 122 into the conduit 141. Specifically, the conduit 141 is configured to be able to be inserted into the cavity 122, and the peristaltic pump 142 can generate a negative pressure on the conduit 141, so that the groundwater in the cavity 122 can flow to the water collection bottle 143.

[0043] In some embodiments, please refer to Figure 8 , the collection assembly 140 includes a plurality of water collection bottles 143. One end of the conduit 141 can be inserted into the cavity 122, and the other end has a plurality of branch pipes, and each branch pipe communicates with each water collection bottle 143 respectively. In some embodiments, each water collection bottle 143 can correspondingly hold the groundwater sample at a certain depth. To avoid the contamination of each water collection bottle 143 by the groundwater samples at other depths, the collection assembly 140 further includes a stop valve 144. The stop valve 144 is disposed on the conduit 141, and the stop valve 144 is configured to be able to conduct or block the conduit 141. Among them, the collection assembly 140 includes a plurality of stop valves 144. For the convenience of description, the stop valves 144 disposed at different positions on the conduit 141 are hereinafter distinguished as the first stop valve, the second stop valve, and the third stop valve. The conduit 141 further includes a discharge pipe. The discharge pipe is disposed between the peristaltic pump 142 and the water collection bottle 143. The first stop valve is disposed on the discharge pipe. The first stop valve can control the communication or isolation of the discharge pipe from the outside. The discharge pipe is configured to be able to discharge the substances in the conduit 141 to avoid the contamination of the groundwater sample. A second stop valve is disposed between the peristaltic pump 142 and the first water collection bottle (for the convenience of description, hereinafter it is defined that the collection assembly 140 includes a first water collection bottle and a second water collection bottle, and the first water collection bottle and the second water collection bottle can be used to hold the groundwater samples at different sampling depths). When the first stop valve at the discharge pipe is in the open state, the second stop valve is in the closed state, so as to block the movement path of the substances in the conduit 141 and prevent them from entering the first water collection bottle. After the first stop valve is closed, the second stop valve is opened, so that the groundwater in the conduit 141 can flow into the first water collection bottle. A third stop valve is provided between the first water collection bottle and the second water collection bottle. When the second stop valve is in the open state, the third stop valve is in the closed state, so as to prevent the groundwater from entering the second water collection bottle. After the second stop valve is closed, the third stop valve can be opened, so that the groundwater in the conduit 141 can flow into the second water collection bottle.

[0044] Please refer to Figure 7 and Figure 4A mud stop tooth 131 is provided on the peripheral wall of one end of the reinforcing rod 130 close to the water permeable hole 121, and the mud stop tooth 131 is configured to be spirally wound around the reinforcing rod 130. A guide groove 125 is provided on the peripheral wall of one side of the sampling rod 120 close to the cavity 122. The water permeable hole 121 is connected to the guide groove 125. The guide groove 125 is configured to be spirally wound in the cavity 122, and the spiral direction of the guide groove 125 is the same as the spiral direction of the mud stop tooth 131. The mud stop tooth 131 is configured to be able to engage with the guide groove 125. Therefore, when the sampling rod 120 is driven by the driving assembly 112 to penetrate into the sediment, the reinforcing rod 130 can be stationary relative to the sampling rod 120 under the restriction of the guide groove 125, and the mud stopper 131 can always block the water permeable hole 121, thereby preventing the reinforcing rod 130 from rotating or shaking relative to the sampling rod 120 under the action of centrifugal force during the rotation of the sampling rod 120, causing the sediment to enter the cavity 122 through the water permeable hole 121. The spiral direction of the guide groove 125 is the same as the rotation direction of the sampling rod 120, thereby preventing the reinforcing rod 130 from shaking in the cavity 122 along the vertical direction under the action of the centrifugal force generated by the rotation of the sampling rod 120, thereby improving the working stability of the groundwater sampling instrument 100.

[0045] In some embodiments, the mud guard teeth 131 extend in the vertical direction, the guide groove 125 extends in the vertical direction, and the water permeable hole 121 is connected to the guide groove 125. When the reinforcing rod 130 is inserted into the cavity 122, the mud guard teeth 131 are configured to be able to be clamped in the guide groove 125, so that the reinforcing rod 130 can be stably connected to the sampling rod 120. When the sampling rod 120 rotates, the reinforcing rod 130 can be prevented from moving relative to the sampling rod 120, resulting in poor structural strength of the sampling rod 120 or even causing sediment to enter the cavity 122 through the water permeable hole 121. Sediment entering the cavity 122 is not conducive to the collection of groundwater. In another embodiment, in order to improve the connection stability between the reinforcing rod 130 and the sampling rod 120 and prevent the reinforcing rod 130 from moving or shaking relative to the sampling rod 120 during the rotation of the sampling rod 120, a protrusion structure is provided on the side of the reinforcing rod 130 close to the conical head 124, and a thread is provided on the surrounding side of the protrusion structure, and a threaded hole is provided on the side of the conical head 124 of the sampling rod 120 close to the main body 123. When the reinforcing rod 130 is inserted into the cavity 122, the protrusion structure can be threadedly connected to the threaded hole, so that the reinforcing rod 130 is firmly connected to the sampling rod 120.

[0046] In order to facilitate the extraction or insertion of the reinforcing rod 130 into the sampling rod 120, a rod handle is provided at one end of the reinforcing rod 130 away from the cone head 124, and the rod handle extends in a direction perpendicular to the vertical direction. When the reinforcing rod 130 needs to be inserted into the cavity 122 by screwing, the provision of the rod handle reduces the difficulty of disassembling or connecting the reinforcing rod 130 and the sampling rod 120, so that the operator can assemble or disassemble the groundwater sampling instrument 100 with more effort.

[0047] Please refer to Figure 9 , a second aspect of the present utility model further provides a method for sampling stratified groundwater, and this method for sampling stratified groundwater is applicable to controlling the groundwater sampling instrument 100 described in any of the above embodiments. Among them, the groundwater sampling instrument 100 includes a fixed seat 110, a sampling rod 120, a reinforcing rod 130, and a collection assembly 140. For the convenience of description, the following takes the collection of groundwater at the first sampling depth and the second sampling depth using the groundwater sampling instrument 100 as an example for illustration. The method for sampling stratified groundwater includes the steps:

[0048] S101: Set up the groundwater sampling instrument 100, where the reinforcing rod 130 is inserted into the cavity 122;

[0049] S102: Make the driving assembly 112 drive the sampling rod 120 to move in the vertical direction so that the sampling rod 120 penetrates into the sediment and reaches the first sampling depth;

[0050] S103: Stop driving the sampling rod 120 and pull the reinforcing rod 130 out of the cavity 122;

[0051] S104: Use the collection assembly 140 to collect the groundwater at the first sampling depth;

[0052] S105: Insert the reinforcing rod 130 into the cavity 122, and make the driving assembly 112 drive the sampling rod 120 to further penetrate into the sediment so that the water-permeable hole 121 reaches the second sampling depth;

[0053] S106: Stop driving the sampling rod 120 and pull the reinforcing rod 130 out of the cavity 122;

[0054] S107: Use the collection assembly 140 to collect the groundwater at the second sampling depth.

[0055] For the operation of collecting groundwater samples at multiple different depths at the same location, steps S105, S106, and S107 can be repeated.

[0056] Specifically, for the convenience of description, it is defined that the collection component 140 includes a first water collecting bottle and a second water collecting bottle. One end of the conduit 141 can be inserted into the cavity 122, and the other end has a plurality of branch pipes. One of the branch pipes communicates with the atmosphere and serves as a discharge pipe, and each branch pipe communicates with the first water collecting bottle and the second water collecting bottle respectively. The first water collecting bottle can be used to load the groundwater sample at the first sampling depth, and the second water collecting bottle can be used to load the groundwater sample at the second sampling depth. It is defined that the collection component 140 further includes a first water stop valve, a second water stop valve, and a third water stop valve. The first water stop valve is arranged on the discharge pipe, the second water stop valve is arranged between the first water collecting bottle and the first water stop valve to control the conduction or closing between the first water collecting bottle and the cavity 122, and the third water stop valve is arranged between the first water collecting bottle and the second water collecting bottle to control the conduction or closing between the second water collecting bottle and the cavity 122.

[0057] When the sampling rod 120 reaches the first sampling depth, after pulling out the reinforcing rod 130 from the cavity 122 and inserting the conduit 141 into the cavity 122, open the first water stop valve, close the second water stop valve and the third water stop valve, and turn on the peristaltic pump 142. The substances in the conduit 141 (which may be a mixture of sediment and groundwater) can be discharged from the conduit 141 through the first water stop valve, thereby improving the quality of groundwater sampling. When the water flowing out of the discharge pipe is clear, close the first water stop valve and open the second water stop valve, so that groundwater can flow into the first water collecting bottle. Similarly, when the sampling rod 120 reaches the second sampling depth, after pulling out the reinforcing rod 130 from the cavity 122 and inserting the conduit 141 into the cavity 122, open the first water stop valve, close the second water stop valve and the third water stop valve, turn on the peristaltic pump 142, so that the substances in the conduit 141 can be discharged from the conduit 141 through the first water stop valve. When the clear water flows out of the discharge pipe, close the first water stop valve and open the third water stop valve, so that groundwater can flow into the second water collecting bottle.

[0058] In some embodiments, after pulling out the reinforcing rod 130 from the cavity 122, in order to discharge the groundwater mixed with sediment in the cavity 122, pressure can also be applied to the cavity 122, and the groundwater and sediment in the cavity 122 are discharged from the cavity 122 through the water permeable holes 121 by the pressure. Then, the pressure applied to the cavity 122 is withdrawn. Thus, groundwater can slowly gather in the cavity 122 through the water permeable holes 121. At this time, the groundwater gathered in the cavity 122 is clearer, which is beneficial to improving the quality of groundwater collection.

[0059] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0060] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or", "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0061] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present utility model under the inventive concept of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A groundwater sampling instrument, characterized in that, Comprising: A fixed seat, including a support frame and a driving component arranged on the support frame; A sampling rod, connected to the driving component, and the sampling rod is configured to be able to move relative to the support frame in the vertical direction under the drive of the driving component. One end of the sampling rod is provided with an opening, and the other end is provided with a water permeable hole. The sampling rod also has a cavity extending in a direction parallel to the rotation axis, and the cavity communicates with the opening and the water permeable hole; A reinforcing rod, detachably accommodated in the cavity, and one end of the reinforcing rod close to the water permeable hole is configured to be able to block the water permeable hole.

2. The groundwater sampling instrument according to claim 1, wherein The sampling rod includes a body part and a conical head part connected to the body part. The water permeable hole is located on the periphery of one end of the body part close to the conical head part, and the cavity is located in the body part. The reinforcing rod can be inserted into the cavity through the opening and abuts against the conical head part.

3. The groundwater sampling instrument according to claim 2, wherein The body part is provided with a plurality of the water permeable holes distributed around the circumference of the rotation axis. The extending direction of the water permeable hole intersects with the radial direction of the cavity, and the extending direction of the water permeable hole is inclined towards the movement direction of the sampling rod.

4. The groundwater sampling instrument according to claim 2, wherein The periphery of the body part is provided with hinge teeth around it. The driving component includes a transmission part, and the transmission part meshes with the hinge teeth. When the driving component rotates, the body part moves relative to the transmission part in the vertical direction.

5. The groundwater sampling instrument according to claim 4, wherein The driving component further includes a rocker, and the rocker is connected to the transmission part. The rocker is configured to be able to rotate around an axis perpendicular to the rotation axis when driven, so as to drive the body part to move relative to the transmission part in the vertical direction.

6. The groundwater sampling instrument according to claim 1, wherein The groundwater sampling instrument further includes a collection component, and the collection component includes a conduit, a peristaltic pump and a water collection bottle. The conduit is configured to be able to communicate the cavity and the water collection bottle. The peristaltic pump is arranged between the cavity and the water collection bottle, and the peristaltic pump is connected to the conduit. The peristaltic pump is configured to be able to introduce the groundwater in the cavity into the conduit.

7. The groundwater sampling instrument according to claim 6, wherein The collection component further includes a water stop valve, and the water stop valve is arranged on the conduit and is located between the peristaltic pump and the water collection bottle. The water stop valve is configured to be able to connect or cut off the cavity and the water collection bottle.

8. The groundwater sampling instrument according to claim 1, wherein The peripheral wall of one end of the reinforcing rod close to the water permeable hole is provided with mud blocking teeth, the mud blocking teeth are configured to be spirally wound around the reinforcing rod, the peripheral wall of one side of the sampling rod close to the cavity is provided with a guiding groove, the water permeable hole communicates with the guiding groove, the guiding groove is configured to be spirally wound in the cavity, and the spiral direction of the guiding groove is the same as that of the mud blocking teeth, the mud blocking teeth are configured to be capable of meshing with the guiding groove, and the spiral direction of the guiding groove is the same as the rotating direction of the sampling rod.

9. The groundwater sampling instrument according to claim 1, wherein The peripheral wall of one end of the reinforcing rod close to the water permeable hole is provided with mud blocking teeth, the mud blocking teeth extend along the vertical direction, the peripheral wall of one side of the sampling rod close to the cavity is provided with a guiding groove, the guiding groove extends along the vertical direction, and the water permeable hole communicates with the guiding groove, and the mud blocking teeth are configured to be capable of being clamped in the guiding groove.

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