A groundwater sampling device for geotechnical engineering investigation

Abstract

The present application relates to the technical field of groundwater sampling, and specifically discloses a groundwater sampling device for geotechnical engineering investigation, which comprises an electric wire releasing device, a buzzer arranged at the top of the front side of the electric wire releasing device, a steel wire rope wound around the outer wall of the electric wire releasing device, a sampling cylinder with its top end arranged at the top end of the steel wire rope, a water inlet arranged at the bottom end of the right side of the outer wall of the sampling cylinder, an air inlet arranged at the top of the right side of the outer wall of the sampling cylinder, and an air outlet arranged at the top of the left side of the outer wall of the sampling cylinder, and three one-way valves arranged at the outer walls of the water inlet, the air inlet and the air outlet respectively. The device effectively solves the problem that the suitable depth sample below the groundwater level cannot be accurately collected in the prior art, improves the accuracy and reliability of groundwater sampling, provides more scientific and accurate data support for groundwater resource management, environmental monitoring and geological research, and helps to promote the in-depth development and progress of related fields.

Description

Technical Field

[0001] This invention relates to the field of groundwater sampling technology, and in particular to a groundwater sampling device for geotechnical engineering exploration. Background Technology

[0002] In geotechnical engineering investigation, groundwater sampling is a crucial step in obtaining groundwater resource characteristics, assessing environmental quality, and supporting geological research. The accuracy of sampling data directly affects the scientific validity of groundwater resource management, pollution risk assessment, and engineering design. However, existing groundwater sampling technologies have many problems and cannot meet the needs of high-precision investigation, as follows:

[0003] First, the accuracy of sampling depth control is low. Existing devices mostly rely on manual estimation (such as marking steel wire ropes with a measuring tape or judging sinking time based on experience) to determine the sampling depth, lacking a precise positioning mechanism for a specific depth below the liquid surface. When there are differences in the stratification of groundwater layers, it is easy for the sampling tube to deviate from the target depth, and the sample to be mixed with water from different depths, so the detection data cannot reflect the true condition of the target layer;

[0004] Secondly, sample purity is difficult to guarantee. Traditional devices often have open or simple valve-controlled water inlet structures, which can lead to shallow water entering prematurely during descent; the swaying of the wire rope and the impact of water flow during the lifting and lowering process can cause air exchange between the inside of the cylinder and the outside water or mixing of water at different depths; some devices lack effective exhaust and air intake coordination control, resulting in pressure imbalance during sampling, which may lead to insufficient sampling or the intake of water from non-target layers.

[0005] Third, the operation is complex and inefficient. Sampling start and stop largely depend on manual monitoring throughout the process, requiring continuous observation of the lowering length and manual control of valves, which is time-consuming and labor-intensive, and prone to sampling failure due to operational delays; after sampling, some devices require disassembly of components or the use of additional tools to discharge the sample, which prolongs the single sampling cycle, and the inefficiency is even more prominent in multi-point and multi-layer sampling scenarios.

[0006] Fourth, the device has poor stability and adaptability. The geological conditions at the exploration site are complex (such as high sand content and fast water flow), and the existing sampling tube is easily tilted by impact, resulting in depth deviation; the core components (such as valves and traction mechanisms) have poor corrosion and wear resistance, are prone to failure after long-term use, have high maintenance costs, and are difficult to adapt to long-term high-frequency field sampling.

[0007] In summary, current technologies have significant shortcomings in depth control, sample purity, operational efficiency, and device stability. There is a need for a device that can achieve precise sampling at specific depths below the liquid surface, ensure sample purity, simplify operation, and adapt to complex environments. Summary of the Invention

[0008] The purpose of this invention is to provide a groundwater sampling device for geotechnical engineering exploration, so as to solve at least one of the technical problems existing in the prior art.

[0009] To solve the above-mentioned technical problems, the present invention provides a groundwater sampling device for geotechnical engineering investigation, comprising: an electric wire feeder; a buzzer disposed on the top front side of the electric wire feeder; a steel wire rope wound around the outer wall of the electric wire feeder; a sampling cylinder disposed at the top of the steel wire rope; a water inlet located at the bottom right side of the outer wall of the sampling cylinder; an air inlet located at the top right side of the outer wall of the sampling cylinder; and an exhaust port located at the top left side of the outer wall of the sampling cylinder; three one-way valves respectively disposed on the outer walls of the water inlet, air inlet, and exhaust port; a piston slidably and compatiblely inserted into the inner cavity of the sampling cylinder; and the bottom end of the piston rod disposed at the top of the piston. The piston rod extends slidably from the top of the sampling tube, and slots are provided on both the front and rear tops of the piston rod's inner cavity. A first spring is sleeved on the outer wall of the piston rod, with its bottom end engaged with the top of the piston and its top end engaged with the top of the sampling tube's inner cavity. A ball valve is located at the bottom of the outer wall of the sampling tube. A sampling mechanism is located at the top of the sampling tube. A float mechanism is located at the top of the outer wall of the sampling tube. An installation groove is located at the top left side of the electric wire rope dispenser, with the outer wall of the wire rope passing through the inner cavity of the installation groove. A stainless steel hammer is detachably installed in the inner cavity of the installation groove and is slidably sleeved on the outer wall of the wire rope.

[0010] Preferably, to fix the piston rod, the sampling mechanism includes: a support column, which is rotatably mounted on the top of the sampling cylinder via a bearing, and is rotatably sleeved on the outer wall of the wire rope, with the support column located in the inner cavity of the piston rod; two locking columns, which are respectively located on the front and rear sides of the bottom end of the outer wall of the support column, and are slidably fitted into the inner cavities of two locking slots; two sliding columns, which are respectively located on the left and right sides of the top of the outer wall of the support column; and a rotating washer, which is rotatably mounted on the top of the support column via a bearing, and is rotatably sleeved on the outer wall of the wire rope.

[0011] Preferably, in order to drive the support column to rotate, the sampling mechanism further includes: a second spring, the second spring being sleeved on the outer wall of the wire rope, the bottom end of the second spring being engaged with the top end of the rotating pad; a sleeve being slidably and rotatably sleeved on the top of the outer wall of the support column, the top end of the second spring being engaged with the top end of the inner cavity of the sleeve, two driving grooves being equidistantly opened on the inner wall of the sleeve along the circumference, two sliding columns being slidably fitted into the bottom ends of the inner cavities of the two driving grooves respectively, and the sleeve being slidably sleeved on the outer wall of the wire rope; and a bracket being disposed at the top of the sampling tube, the outer wall of the sleeve being slidably fitted into the inner cavity of the bracket.

[0012] Preferably, the outer wall of the sleeve is octagonal.

[0013] Preferably, the outer wall of the locking pin is rotatably fitted with a roller via a bearing, and the outer wall of the roller is in contact with the bottom end of the inner cavity of the locking groove.

[0014] Preferably, to adjust the distance between the float and the sampling tube, the float mechanism includes: a rotating rod, the rear end of which is rotatably mounted on the top front side of the outer wall of the sampling tube via a bearing; a cable collector sleeved on the outer wall of the rotating rod and locked; a pull rope wound around the outer wall of the cable collector; a ratchet mounted on the front end of the cable collector; a housing mounted on the top front side of the outer wall of the sampling tube, the cable collector located in the inner cavity of the housing, and the front end of the rotating rod rotatably extending out of the front side of the housing; a connecting rod mounted on the front side of the inner cavity of the housing; a pawl rotatably mounted on the outer wall of the connecting rod via a bearing at the middle of its outer wall, the pawl and the ratchet cooperating, the right end of the pawl slidably extending out of the right side of the housing; one end of a third spring engaged in the front side of the inner cavity of the housing, and the other end of the third spring engaged in the outer wall of the pawl.

[0015] Preferably, to trigger the buzzer to sound an alarm, the float mechanism further includes: a float, which is slidably sleeved on the top of the outer wall of the pull rope; a first groove is formed in the middle of the upper and lower sides of the float's inner cavity along the left-right direction; a second groove is formed in the left side of the upper and lower sides of the float's inner cavity along the front-back direction; the left and right ends of a first guide rod are respectively located on the left and right sides of the inner cavity of the first groove; a first slider is slidably fitted into the left side of the inner cavity of the first groove, and the first slider is slidably sleeved on the outer wall of the first guide rod; the middle of the upper and lower sides of the pull plate are respectively located inside the two first sliders; the top of the pull rope is located in the middle of the right side of the pull plate; there are two connecting rods, one end of each connecting rod is rotatably set on the front and back sides of the pull plate via pins; the front and back ends of a second guide rod are respectively located on the front and back sides of the inner cavity of the second groove; Fourth There are four springs, each sleeved on the front and rear sides of the outer wall of the two second guide rods, with the outer ends of the four springs respectively engaged with the front and rear sides of the inner cavity of the two second slide grooves; there are four second sliders, each slidably fitted into the front and rear sides of the inner cavity of the two second slide grooves, and slidably sleeved on the outer wall of the second guide rods, with the inner ends of the four springs respectively engaged with the outer sides of the four second sliders; there are two insulating plates, with their upper and lower sides respectively located on the inner sides of the four second sliders, and the other ends of the two connecting rods rotatably located on the middle of the outer wall of the two insulating plates via pins; there are two contacts, each located on the inner side of the two insulating plates, with the positions of the two contacts corresponding to each other, and one contact being electrically connected to the buzzer.

[0016] Preferably, a counterweight is provided at the bottom of the sampling tube.

[0017] The groundwater sampling device for geotechnical engineering exploration proposed in this invention has the following advantages:

[0018] 1. This invention uses a ratchet to press the pawl, causing the pawl and ratchet to separate, and rotates the rotating rod to drive the cable collector to rotate, thereby adjusting the length of the pull rope until the length of the pull rope is adjusted to the length required for sampling below the liquid surface. The sampling tube can be lowered into the groundwater using an electric cable release device.

[0019] 2. As the sampling tube moves into the groundwater, it gradually sinks while the float remains on the surface. Once the tube reaches a suitable depth, the pull rope is straightened, and the tube continues to sink. Under gravity, the pull rope moves the pull plate to the right along the inner cavity of the first chute, while the buoyancy of the float maintains its stability. The rightward movement of the pull plate can also move two insulating plates inward along the inner cavity of the second chute via a connecting rod, stretching the fourth spring and causing it to deform elastically until the two insulating plates bring the two contacts into contact. At this point, the buzzer sounds an alarm, shutting off the electric cable release mechanism and preventing the sampling tube from sinking further.

[0020] 3. In this invention, the stainless steel hammer is removed from the inner cavity of the mounting slot and lowered along the outer wall of the wire rope. Guided by the wire rope, the stainless steel hammer sinks into the groundwater and strikes the top of the sleeve, causing the sleeve to move downward and compress the second spring, causing it to deform elastically. The downward movement of the sleeve, in conjunction with the drive slot and the sliding column, causes the support column to rotate, thereby using the support column to drive the locking column to rotate until the locking column rotates out of the inner cavity of the locking slot. At this point, the piston rod is released from its fixation. Under the elastic force of the first spring, the piston rod is pushed to move the piston upward. The upward movement of the piston, under pressure, causes the groundwater at that location to flow into the inner cavity of the sampling tube through the inlet, thus completing the groundwater depth sampling.

[0021] 4. This device effectively solves the problem that existing technologies cannot accurately collect samples at a suitable depth below the groundwater level. This device improves the accuracy and reliability of groundwater sampling, providing more scientific and accurate data support for groundwater resource management, environmental monitoring and geological research, and helps to promote the in-depth development and progress of related fields. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of an electric wire feeder.

[0025] Figure 3 This is an exploded view of the sampling tube;

[0026] Figure 4 This is a right-side cross-sectional view of the sampling tube;

[0027] Figure 5 This is a front sectional view of the sampling mechanism;

[0028] Figure 6 An exploded view of the sampling facility;

[0029] Figure 7 This is a schematic diagram of the drive slot structure;

[0030] Figure 8 An exploded view of the buoy mechanism;

[0031] Figure 9 for Figure 2 Enlarged view of point A;

[0032] Figure 10 for Figure 4 Enlarged view of point B;

[0033] Figure 11 for Figure 4 Enlarged view of point C;

[0034] Figure 12 for Figure 5 Enlarged view of point D;

[0035] Figure 13 for Figure 8 Enlarged view of point E;

[0036] Figure 14 for Figure 8 Enlarged view at point F;

[0037] Figure 15 for Figure 8 Enlarged view of point G;

[0038] Figure 16 for Figure 8 Enlarged view of point H.

[0039] Figure label:

[0040] 1. Electric wire feeder; 2. Buzzer; 3. Steel wire rope; 4. Sampling tube; 5. Piston; 6. Piston rod; 7. Slot; 8. Sampling mechanism; 81. Support column; 82. Slot; 83. Roller; 84. Sliding column; 85. Rotating washer; 86. Second spring; 87. Sleeve; 88. Drive slot; 89. Bracket; 9. Float mechanism; 91. Rotating rod; 92. Wire feeder; 93. Pull rope; 94. Ratchet; 95. Housing; 96. Connecting rod; 97. Pawl; 98. Third spring 99. Spring; 910. Float; 911. First slide groove; 912. Second slide groove; 913. First guide rod; 914. First slider; 915. Pull plate; 916. Connecting rod; 917. Second guide rod; 918. Fourth spring; 919. Second slider; 920. Insulating plate; 920. Contact point; 10. First spring; 11. Ball valve; 12. Counterweight; 13. Mounting groove; 14. Stainless steel hammer; 15. Water inlet; 16. Air inlet; 17. Exhaust port; 18. Check valve. Detailed Implementation

[0041] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0044] It should also be noted that the specific embodiments or implementation methods described below are a series of optimized settings listed by the present invention to further explain the specific content of the invention, and these settings can be combined or used in conjunction with each other.

[0045] The present invention will be further explained below with reference to specific embodiments.

[0046] Please see Figures 1-16This invention provides a technical solution for a groundwater sampling device for geotechnical engineering investigation, comprising: an electric wire feeder 1, a buzzer 2, a steel wire rope 3, a sampling cylinder 4, a piston 5, a piston rod 6, a slot 7, a sampling mechanism 8, a float mechanism 9, a first spring 10, a ball valve 11, a counterweight 12, a mounting groove 13, a stainless steel hammer 14, a water inlet 15, an air inlet 16, an exhaust port 17, and a one-way valve 18. The buzzer 2 is located on the top front side of the electric wire feeder 1. The buzzer 2 is existing technology and will not be described in detail here. The buzzer 2 is used to remind the operator that the sampling cylinder 4 has reached the specified depth. The steel wire rope 3 is wound around the outer wall of the electric wire feeder 1 and is used to pull the sampling cylinder 4. The top of the sampling cylinder 4 is located at the top of the wire rope 3. A water inlet 15 is located at the bottom right side of the outer wall of the sampling cylinder 4, an air inlet 16 is located at the top right side of the outer wall of the sampling cylinder 4, and an exhaust outlet 17 is located at the top left side of the outer wall of the sampling cylinder 4. The sampling cylinder 4 is used to hold groundwater. There are three one-way valves 18, which are respectively located on the outer walls of the water inlet 15, air inlet 16, and exhaust outlet 17. The one-way valves 18 are existing technology and will not be described in detail here. The one-way valves 18 are used to control the flow direction of groundwater and gas. A piston 5 is slidably fitted into the inner cavity of the sampling cylinder 4. The bottom end of the piston rod 6 is located at the top end of the piston 5, and the top end of the piston rod 6 extends slidably outwards... The top of the sampling cylinder 4 and the top of the piston rod 6 are provided with slots 7 on both the front and rear sides of the inner cavity. The first spring 10 is sleeved on the outer wall of the piston rod 6, and the bottom end of the first spring 10 is engaged with the top end of the piston 5. The top end of the first spring 10 is engaged with the top end of the inner cavity of the sampling cylinder 4. The first spring 10 is a rotary spring. After being compressed or stretched by external force, it undergoes elastic deformation and returns to its initial state after the external force is removed. At this time, the first spring 10 is in a stretched state. The first spring 10 can be used to pull the piston rod 6 to drive the piston 5 to move upward. The ball valve 11 is set at the bottom end of the outer wall of the sampling cylinder 4. The ball valve 11 is existing technology and will not be described in detail here. The ball valve 11 is used to control the opening of the inner cavity of the sampling cylinder 4. The sampling mechanism 8 is located at the top of the sampling cylinder 4 and is used to release the piston rod 6. The float mechanism 9 is located at the top of the outer wall of the sampling cylinder 4 and is used to activate the buzzer 2. The mounting groove 13 is located at the top left side of the electric wire feeder 1. The outer wall of the wire rope 3 passes through the inner cavity of the mounting groove 13. The mounting groove 13 is used to install the stainless steel hammer 14. The stainless steel hammer 14 is detachably located in the inner cavity of the mounting groove 13 and is slidably sleeved on the outer wall of the wire rope 3. The stainless steel hammer 14 is used to strike the sleeve 87 to move downward. The counterweight 12 is located at the bottom of the sampling cylinder 4 and can ensure that the sampling cylinder 4 is vertically downward.

[0047] As a preferred embodiment, the sampling mechanism 8 further includes: a support column 81, a locking column 82, a roller 83, a sliding column 84, a rotating pad 85, a second spring 86, a sleeve 87, a drive groove 88, and a bracket 89. The support column 81 is rotatably mounted on the top of the sampling cylinder 4 via bearings, and is rotatably sleeved on the outer wall of the wire rope 3. The support column 81 is located inside the piston rod 6. Two locking columns 82 are provided, one on the front and one on the back of the bottom of the outer wall of the support column 81. The sliding, compatible insert is connected to the inner cavity of the two slots 7. The position of the piston rod 6 can be fixed by the cooperation between the locking pin 82 and the slot 7. The roller 83 is rotatably sleeved on the outer wall of the locking pin 82 through the bearing. The outer wall of the roller 83 contacts the bottom end of the inner cavity of the slot 7. The roller 83 can reduce the friction between the locking pin 82 and the slot 7. There are two sliding pins 84, which are respectively set on the left and right sides of the top of the outer wall of the support column 81. When the sleeve 87 moves downward, the sliding pins 84 and the drive groove 88 can be used to fix the position of the piston rod 6. The cooperation between the components causes the support column 81 to rotate. A rotating washer 85 is rotatably mounted on the top of the support column 81 via a bearing. The rotating washer 85 is rotatably sleeved on the outer wall of the wire rope 3. A second spring 86 is sleeved on the outer wall of the wire rope 3, with its bottom end engaged with the top of the rotating washer 85. The second spring 86 is a rotating spring; it undergoes elastic deformation after being compressed or stretched by external force and returns to its initial state after the external force is removed. The second spring 86 here serves to support the sleeve 87, which is slidable and rotatable. The top of the second spring 86 is attached to the top of the outer wall of the support column 81. The top of the second spring 86 is engaged with the top of the inner cavity of the sleeve 87. Two drive grooves 88 are equidistantly opened on the inner wall of the sleeve 87 along the circumference. Two sliding columns 84 are slidably fitted into the bottom of the inner cavity of the two drive grooves 88. The sleeve 87 is slidably fitted onto the outer wall of the wire rope 3. The outer wall of the sleeve 87 is octagonal. The bracket 89 is set at the top of the sampling tube 4. The outer wall of the sleeve 87 is slidably fitted into the inner cavity of the bracket 89. The bracket 89 is used to limit the position of the sleeve 87.

[0048] As a preferred embodiment, the float mechanism 9 further includes: a rotating rod 91, a cable collector 92, a pull rope 93, a ratchet 94, a housing 95, a connecting rod 96, a pawl 97, a third spring 98, a float 99, a first slide groove 910, a second slide groove 911, a first guide rod 912, a first slider 913, a pull plate 914, a connecting rod 915, a second guide rod 916, a fourth spring 917, a second slider 918, an insulating plate 919, and a contact point 920. The rear end of the rotating rod 91 is rotatably mounted on the top front side of the outer wall of the sampling tube 4 via a bearing. The cable collector 92 is sleeved on the outer wall of the rotating rod 91 and locked. The cable collector 92 is used to collect the pull rope 93, which is wound around the outer wall of the cable collector 92. The pull rope 93 is used to pull the pull plate. 914 moves, ratchet 94 is located at the front end of hub 92, housing 95 is located at the top front side of the outer wall of sampling tube 4, hub 92 is located in the inner cavity of housing 95, the front end of rotating rod 91 extends rotatably out of the front side of housing 95, connecting rod 96 is located in the front side of the inner cavity of housing 95, the middle part of the outer wall of pawl 97 is rotatably sleeved on the outer wall of connecting rod 96 through bearing, pawl 97 and ratchet 94 cooperate, the right end of pawl 97 extends slidably out of the right side of housing 95, the cooperation between ratchet 94 and pawl 97 can prevent hub 92 from rotating, one end of third spring 98 is engaged in the front side of the inner cavity of housing 95, the other end of third spring 98 is engaged in the outer wall of pawl 97, third spring 98 is a rotating spring The spring, when subjected to external compression or stretching, undergoes elastic deformation and returns to its initial state after the external force is removed. The third spring 98 is used to pull the pawl 97 back to its initial state. The float 99 is slidably sleeved on the top of the outer wall of the pull rope 93. The upper and lower sides of the inner cavity of the float 99 are provided with first grooves 910 in the left and right directions, and the upper and lower sides of the inner cavity of the float 99 are provided with second grooves 911 in the front and back directions. The left and right ends of the first guide rod 912 are respectively set on the left and right sides of the inner cavity of the first groove 910. The first guide rod 912 can prevent the first slider 913 from disengaging from the inner cavity of the first groove 910. The first slider 913 is slidably fitted into the left side of the inner cavity of the first groove 910. The first slider 913 is slidably sleeved. On the outer wall of the first guide rod 912, the upper and lower middle parts of the pull plate 914 are respectively disposed inside the two first sliders 913. The top end of the pull rope 93 is disposed on the middle right side of the pull plate 914. The pull plate 914 can drive the insulating plate 919 to move through the connecting rod 915. There are two connecting rods 915, one end of which is rotatably disposed on the front and rear sides of the pull plate 914 through pins. The front and rear ends of the second guide rod 916 are respectively disposed on the front and rear sides of the inner cavity of the second slide groove 911. The second guide rod 916 can prevent the second slider 918 from disengaging from the inner cavity of the second slide groove 911. There are four fourth springs 917, which are respectively sleeved on the front and rear sides of the outer wall of the two second guide rods 916.The outer ends of the four fourth springs 917 are respectively engaged with the front and rear sides of the inner cavities of the two second slide grooves 911. The fourth springs 917 are rotary springs, which undergo elastic deformation after being compressed or stretched by external force, and return to their initial state when the external force is removed. The fourth springs 917 are used to pull the second sliders 918 back to their initial positions. There are four second sliders 918, which are slidably fitted and inserted into the front and rear sides of the inner cavities of the two second slide grooves 911. The second sliders 918 are slidably sleeved on the outer wall of the second guide rod 916. The inner ends of the four fourth springs 917 are respectively engaged with the four second slide grooves 911. On the outer side of the two sliders 918, there are two insulating plates 919. The upper and lower sides of the two insulating plates 919 are respectively located on the inner sides of the four second sliders 918. The other ends of two connecting rods 915 are rotatably mounted on the middle of the outer wall of the two insulating plates 919 via pins. The insulating plates 919 can drive the contact points 920 to move. There are two contact points 920, each located on the inner side of the two insulating plates 919, with corresponding positions. One contact point 920 is electrically connected to the buzzer 2. When the two contacts 920 come into contact, the buzzer 2 will sound an alarm.

[0049] Its detailed connection method is a well-known technology in this field. The following mainly introduces the working principle and process, and the specific work is as follows.

[0050] In use, press the pawl 97 and stretch the third spring 98 to cause elastic deformation until the pawl 97 and ratchet 94 separate. Rotate the rotating rod 91 clockwise according to the required sampling depth below the groundwater surface. Clockwise rotation of the rotating rod 91 will cause the cable collector 92 to rotate, thus releasing the pull rope 93 from the cable collector 92 for line release. Continue releasing the line until the length of the released pull rope 93 is the same as the required sampling depth below the groundwater surface. Start the electric line release device 1, which releases the wire rope 3. The wire rope 3 pulls the sampling cylinder 4 downwards, causing it to move towards the groundwater until it sinks below the groundwater surface. At this point, due to the buoyancy of the float 99, the float 99 will float... Floating on the surface of the groundwater, as the sampling tube 4 sinks, the distance between the float 99 and the sampling tube 4 gradually increases until the sampling tube 4 sinks to the point where the pull rope 93 is taut. As the sampling tube 4 continues to sink, the pull rope 93 pulls the pull plate 914 to the right along the inner cavity of the first slide groove 910. The buoyancy of the float 99 ensures its stability. The movement of the pull plate 914 to the right uses the connecting rod 915 to pull the two insulating plates 919, causing the contact point 920 to move inward along the inner cavity of the second slide groove 911. This causes the two contact points 920 to gradually approach each other, stretching the fourth spring 917 and causing it to elastically deform until the two contact points 920 make contact. At this point, the buzzer 2 is activated, and the buzzer 2 sounds an alarm. This indicates that the sampling tube 4 has reached the specified depth. The electric wire feeder 1 is then turned off, and the stainless steel hammer 14 is removed from the inner cavity of the mounting slot 13. The stainless steel hammer 14 is lowered along the wire rope 3. Guided by the wire rope 3, the stainless steel hammer 14 falls into the groundwater and strikes the top of the sleeve 87. Under the weight and potential energy of the stainless steel hammer 14, the sleeve 87 moves downward, compressing the second spring 86 and causing elastic deformation. The downward movement of the sleeve 87 utilizes the cooperation between the drive slot 88 and the sliding column 84 to rotate the support column 81. The rotation of the support column 81 drives the locking column 82 to rotate until the locking column 82 moves out of the inner cavity of the locking slot 7, thus releasing the fixation of the piston rod 6. Under the elastic force of spring 10, piston rod 6 is pulled, causing piston 5 to move upward. This pressure forces groundwater at the current location to flow into the inner cavity of sampling tube 4 through inlet 15, and causes air at the top of piston 5 to be expelled from the inner cavity of sampling tube 4 through exhaust port 17. This continues until the first spring 10 returns to its initial state. Then, piston rod 6 pulls piston upward to a suitable height. At this point, a suitable amount of groundwater is collected in the inner cavity of sampling tube 4. The electric wire feeder 1 is then activated, and sampling tube 4 is pulled up to the ground surface using the electric wire feeder 1. When it is necessary to release the groundwater from the inner cavity of sampling tube 4, the ball valve 11 is rotated to open, pressing down piston rod 6 to move piston 5 downward, and stretching the first spring 10, causing elastic deformation.This allows the groundwater inside the sampling tube 4 to be discharged through the bottom of the sampling tube 4. Rotating the rotating rod 91 counterclockwise causes the collector 92 to rotate, thus collecting the pull rope 93 onto the collector 92.

[0051] In summary, this device effectively solves the problem of the inability to accurately collect samples at a suitable depth below the groundwater surface in existing technologies. This device improves the accuracy and reliability of groundwater sampling, providing more scientific and accurate data support for groundwater resource management, environmental monitoring, and geological research, and helps to promote the in-depth development and progress of related fields.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A groundwater sampling device for geotechnical engineering investigation, characterized in that, include: Electric wire feeder; A buzzer, wherein the buzzer is disposed on the top front side of the electric wire feeder; Steel wire rope, the steel wire rope being wound around the outer wall of the electric wire feeder; The sampling tube has its top end located at the top end of a steel wire rope. A water inlet is located at the bottom right side of the outer wall of the sampling tube, an air inlet is located at the top right side of the outer wall of the sampling tube, and an exhaust outlet is located at the top left side of the outer wall of the sampling tube. Three check valves are provided, with the three check valves respectively disposed on the outer walls of the water inlet, air inlet and air outlet. A piston, which is slidably and adaptively inserted into the inner cavity of the sampling tube; A piston rod, the bottom end of which is located at the top end of the piston, the top end of which extends slidably out of the top end of the sampling cylinder, and slots are provided on both the front and rear top ends of the inner cavity of the piston rod. The first spring is sleeved on the outer wall of the piston rod, the bottom end of the first spring is engaged with the top end of the piston, and the top end of the first spring is engaged with the top end of the inner cavity of the sampling tube. A ball valve, wherein the ball valve is disposed at the bottom end of the outer wall of the sampling cylinder; A sampling mechanism, wherein the sampling mechanism is disposed at the top of the sampling tube; A float mechanism is provided on the top of the outer wall of the sampling tube; The mounting slot is located on the top left side of the electric wire feeder, and the outer wall of the wire rope passes through the inner cavity of the mounting slot. A stainless steel striking hammer, wherein the stainless steel striking hammer is detachably disposed in the inner cavity of the mounting groove, and the stainless steel striking hammer is slidably sleeved on the outer wall of the wire rope. The float mechanism includes: A rotating rod, the rear end of which is rotatably mounted on the top front side of the outer wall of the sampling tube via a bearing; A hub, which is sleeved on the outer wall of the rotating rod and locked in place; A pull cord, which is wound around the outer wall of the hub; A ratchet, wherein the ratchet is disposed at the front end of the hub; The housing is located on the top of the front side of the outer wall of the sampling tube, the hub is located in the inner cavity of the housing, and the front end of the rotating rod extends rotatably out of the front side of the housing; A connecting rod, wherein the connecting rod is disposed on the front side of the inner cavity of the housing; The pawl is rotatably sleeved on the outer wall of the connecting rod via a bearing in the middle of its outer wall. The pawl and the ratchet cooperate with each other, and the right end of the pawl extends slidably out of the right side of the housing. The third spring, one end of which is engaged with the front side of the inner cavity of the housing, and the other end of which is engaged with the outer wall of the pawl; The float mechanism also includes: The float is slidably sleeved on the top of the outer wall of the pull rope. The middle of the upper and lower sides of the inner cavity of the float is provided with a first sliding groove in the left and right direction, and the left side of the upper and lower sides of the inner cavity of the float is provided with a second sliding groove in the front and back direction. The first guide rod has its left and right ends respectively disposed on the left and right sides of the inner cavity of the first slide groove; The first slider is slidably adapted to be inserted into the left side of the inner cavity of the first slide groove, and the first slider is slidably sleeved on the outer wall of the first guide rod. A pull plate, the upper and lower sides of which are respectively located inside the two first sliders, and the top end of the pull rope is located at the middle right side of the pull plate; The connecting rods are of two types, and one end of each connecting rod is rotatably mounted on the front and rear sides of the pull plate via a pin. The second guide rod has its front and rear ends respectively located on the front and rear sides of the inner cavity of the second slide groove; The fourth spring, there are four of them, and the four fourth springs are respectively sleeved on the front and rear sides of the outer wall of the two second guide rods, and the outer ends of the four fourth springs are respectively engaged with the front and rear sides of the inner cavity of the two second sliding grooves. The second slider, there are four second sliders, and the four second sliders are respectively slidably adapted to be inserted into the front and rear sides of the inner cavity of the two second slide grooves. The second sliders are slidably sleeved on the outer wall of the second guide rod. The inner ends of the four fourth springs are respectively snapped into the outer sides of the four second sliders. The insulating plate consists of two insulating plates, with the upper and lower sides of the two insulating plates respectively disposed inside the four second sliders. The other ends of the two connecting rods are rotatably disposed in the middle of the outer wall of the two insulating plates via pins. The contact has two contacts, which are respectively disposed on the inner side of two insulating plates. The positions of the two contacts are corresponding, and one of the contacts is electrically connected to the buzzer. The stainless steel hammer is lowered along the outer wall of the wire rope, releasing the piston rod from its fixation. Under the elastic force of the first spring, the piston rod is pushed, causing the piston to move upward. Groundwater flows into the sampling tube through the inlet.

2. The groundwater sampling device for geotechnical engineering investigation according to claim 1, characterized in that, The sampling mechanism includes: A support column is rotatably mounted on the top of the sampling cylinder via a bearing. The support column is rotatably sleeved on the outer wall of the wire rope. The support column is located in the inner cavity of the piston rod. The number of the two locking posts is two, and the two locking posts are respectively set on the front and rear sides of the bottom end of the outer wall of the support post. The two locking posts are slidably adapted to be inserted into the inner cavity of the two locking slots. Two sliding columns are respectively disposed on the top left and right sides of the outer wall of the support column. A rotating washer is rotatably mounted on the top of a support column via a bearing, and the rotating washer is rotatably sleeved on the outer wall of the wire rope.

3. A groundwater sampling device for geotechnical engineering investigation according to claim 2, characterized in that, The sampling mechanism also includes: The second spring is sleeved on the outer wall of the wire rope, and the bottom end of the second spring is engaged with the top end of the rotating washer. A sleeve is slidably and rotatably fitted onto the top of the outer wall of the support column. The top end of the second spring is engaged with the top end of the inner cavity of the sleeve. Two drive grooves are equidistantly opened on the inner wall of the sleeve along the circumference. The two sliding columns are slidably and compatiblely inserted into the bottom end of the inner cavity of the two drive grooves. The sleeve is slidably fitted onto the outer wall of the wire rope. A support is provided at the top of the sampling tube, and the outer wall of the sleeve is slidably fitted into the inner cavity of the support.

4. A groundwater sampling device for geotechnical engineering investigation according to claim 3, characterized in that, The outer wall of the sleeve is octagonal.

5. A groundwater sampling device for geotechnical engineering investigation according to claim 4, characterized in that, The outer wall of the locking pin is rotatably fitted with a roller via a bearing, and the outer wall of the roller is in contact with the bottom end of the inner cavity of the locking groove.

6. A groundwater sampling device for geotechnical engineering investigation according to claim 1, characterized in that, A counterweight is provided at the bottom of the sampling tube.

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