A groundwater sampling device for environmental testing

Abstract

The present invention relates to the field of groundwater sampling technology, and in particular to a groundwater sample sampling device for environmental testing, comprising a base plate and a guide cable arranged on the base plate via a winding device, wherein the end of the guide cable is connected to a casing, and a plurality of collecting tubes with a suction mechanism are arranged on the inner side of the casing; the suction mechanism comprises a piston with an armature slidably arranged on the inner side of the collecting tube. The present invention drives the guide cable into the groundwater layer through the winding device, and the guide cable drives the casing at the end and the plurality of collecting tubes to extend into the groundwater layer. At the same time, the guide cable movement stroke is measured in real time by a trigger mechanism. As the casing at the end of the guide cable and the collecting tube sequentially descend to different depths of the groundwater layer, the trigger mechanism can sequentially control the suction mechanisms in the different collecting tubes to start, and the groundwater at different depths is respectively sucked into the inner sides of the plurality of collecting tubes, thereby greatly improving the collection efficiency of groundwater samples.

Description

Technical Field

[0001] The present invention relates to the technical field of groundwater sampling, and in particular to a groundwater sampling device for environmental detection. Background Art

[0002] In environmental testing, it is necessary to sample water at different depths of the groundwater layer. This sampling method is usually used to study indicators such as the chemical composition, physical properties, and microbial content of groundwater in order to understand information such as groundwater quality, pollution status, groundwater flow rate and direction.

[0003] After searching, the Chinese patent with the authorization announcement number CN118624295B discloses a groundwater sampling device with different depths for groundwater investigation. The groundwater sampling device with different depths for groundwater investigation provided by the invention opens the limit assembly at a single collecting tube by adjusting the assembly, so that when the pulling frame moves upward, it can independently drive the collecting tube at the loosened limit assembly to move upward, so that the collecting tube is separated from the bottom cover, thereby allowing the water sample to flow into the collecting tube. After the sampling is completed, the pulling frame moves downward and drives the collecting tube to be stored on the bottom cover again, thereby achieving the sealing of the collecting tube. At the same time, the depth of the sampling device is adjusted again, and the limit assembly on the corresponding collecting tube is opened in sequence by adjusting the assembly, and the corresponding collecting tube is opened by the pulling frame for sampling. Sampling at multiple depth levels is completed in sequence, which is easy to operate and improves the sampling efficiency on site.

[0004] Based on the above search and combined with actual problems, it was found that: when it is necessary to collect groundwater samples of multiple different depths at the same time, it is necessary to frequently adjust the depth of the device in the groundwater layer, and sample the groundwater after adjusting to the specified depth. This greatly increases the difficulty of sampling operation and reduces the efficiency of groundwater sampling. It is also inconvenient to accurately control the depth of the device in the groundwater layer, resulting in poor sampling accuracy. Summary of the Invention

[0005] The object of the present invention is to provide a groundwater sampling device for environmental detection to solve the problems raised in the above background technology.

[0006] The technical solution of the present invention is: a groundwater sample sampling device for environmental detection, comprising a base plate, and a guide cable arranged on the base plate through a winding device, the end of the guide cable is connected to a casing, and a plurality of collecting cylinders with suction mechanisms are arranged on the inner side of the casing; the suction mechanism comprises a piston with an armature slidably arranged on the inner side of the collecting cylinder, an electromagnet installed on the top end of the inner side of the collecting cylinder, and an inlet pipe and an outlet pipe inserted at the lower end of the collecting cylinder; the trigger mechanism also comprises a trigger mechanism for measuring the movement stroke of the guide cable and triggering the plurality of suction mechanisms in sequence; the trigger mechanism comprises a Two vertical plates, two pressure wheels are rotatably arranged between the two vertical plates, a side plate is fixed on one side of one of the vertical plates, a cam is rotatably connected to one side of the side plate, and the cam is connected to a pressure wheel at the upper end through a gear reduction mechanism, a circular guide rail concentric with the cam is fixed on one side of the side plate, and a plurality of arc-shaped sliders are movably arranged on the inner side of the circular guide rail, a press switch is provided on one side of each arc-shaped slider, and a sliding rod for pushing the press switch is slidably connected to the inside of each arc-shaped slider, and the two contacts of the plurality of press switches are electrically connected to the wires in the guide cable through a conductive structure.

[0007] Preferably, the suction mechanism also includes two one-way valves installed in opposite directions on the inside of the water inlet pipe and the water outlet pipe, the conduction direction of the one-way valve located on the inside of the water inlet pipe points to the inside of the collecting cylinder, and the conduction direction of the one-way valve located on the inside of the water outlet pipe points to the outside of the collecting cylinder, and also includes a second spring that elastically connects the piston to the inner top end of the collecting cylinder.

[0008] Preferably, the winding device includes two roller frames fixed to one end of the upper side of the base plate, a winding roller is rotatably connected between the two roller frames, and a motor for driving the winding roller to rotate is installed on one side of one of the roller frames.

[0009] Preferably, the conductive structure includes an extension shaft fixed at one end of the winding roller and an extension rod fixed at one side of one of the roller frames, a brush group with the same number as the push switches is provided on the outside of the extension rod, and a collector ring with the same number as the push switches is provided on the outside of the extension shaft, the brush group includes a positive brush and a negative brush fixed on the outside of the extension rod, the positive brush and the negative brush are electrically connected to the two end contacts of the corresponding push switch respectively, the collector ring includes a positive slip ring and a negative slip ring sleeved on the outside of the extension shaft, the positive slip ring and the negative slip ring are connected in series to the electromagnet circuit at the corresponding position through the wire in the bottom plate, and the positive brush and the negative brush are respectively slidably adapted to the outside of the positive slip ring and the negative slip ring.

[0010] Preferably, the gear reduction mechanism includes a driving pinion fixed to a pressure wheel at the upper end, a driven large gear fixed to the cam, a first coaxial gear set and a second coaxial gear set transmission-connected between the driving pinion and the driven large gear, the first coaxial gear set and the second coaxial gear set both include a transmission large gear and a transmission pinion fixed to each other, the first coaxial gear set is rotationally connected to one side of the vertical plate, the second coaxial gear set is rotationally connected to one side of the side plate, the transmission large gear in the first coaxial gear set is meshed with the driving pinion, and the transmission pinion in the first coaxial gear set is meshed with the transmission large gear in the second coaxial gear set, and the transmission pinion in the second coaxial gear set is meshed with the driven large gear.

[0011] Preferably, a limiting mechanism is provided between each of the sliding rods and each of the arc-shaped sliders, and the limiting mechanism includes two grooves symmetrically opened on one side of the arc-shaped slider, and the inner sides of the two grooves are symmetrically rotatably connected to two sleeves, and one end of the two sleeves is slidably inserted with a telescopic rod, and one end of the two telescopic rods is rotatably connected to the outer side of the sliding rod, and the two telescopic rods are elastically connected to the ends of the two sleeves respectively through a first spring.

[0012] Preferably, both ends of each of the arc-shaped sliders are threadedly connected with locking bolts, and a knob is fixed to the end of each of the locking bolts.

[0013] Preferably, a wheel frame is fixed to one end of the upper side of the base plate, and the top end of the wheel frame is rotatably connected to a guide wheel for supporting the guide cable.

[0014] Preferably, one end of each of the sliding rods is rotatably connected to a roller that is adapted to roll with the outer side of the cam.

[0015] Preferably, a straight sliding groove is opened at the position of a pressure wheel at the lower end of the two vertical plates, and the inner sides of the two straight sliding grooves are slidably connected with rectangular sliders. The lower ends of the two rectangular sliders are elastically connected to the lower ends of the two straight sliding grooves through pressing springs, and the two ends of the pressure wheel are rotatably connected to the two rectangular sliders through rotating shafts.

[0016] The present invention provides a groundwater sampling device for environmental testing by improving the present invention. Compared with the prior art, the present invention has the following improvements and advantages:

[0017] First: The present invention drives the guide cable into the groundwater layer through the winding device, and the guide cable drives the casing and multiple collecting tubes at the end to extend into the groundwater layer. At the same time, the movement stroke of the guide cable is measured in real time through the trigger mechanism. As the casing and collecting tube at the end of the guide cable descend to different depths of the groundwater layer in turn, the trigger mechanism can control the suction mechanism in different collecting tubes to start in turn, and suck the groundwater at different depths into the inner side of multiple collecting tubes respectively, which greatly improves the collection efficiency of groundwater samples, and also improves the accuracy of sampling groundwater at different depths.

[0018] Second: The present invention slides multiple arc-shaped sliders on the inner side of the circular guide rail, and fixes the arc-shaped sliders at any position of the circular guide rail through locking bolts on each arc-shaped slider, so that each slide bar can be adjusted to different angular positions on the circular guide rail. According to the depth of the groundwater layer at different positions, the position of each slide bar can be flexibly adjusted, so that multiple suction mechanisms can be controlled to start at a specified depth, thereby improving the sampling accuracy of groundwater samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0021] Figure 2 Schematic diagram of the structure inside the casing of the present invention;

[0022] Figure 3 It is a schematic cross-sectional view of the present invention;

[0023] Figure 4 For the present invention Figure 3 Schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 5 For the present invention Figure 1 Schematic diagram of the enlarged structure at B in the middle;

[0025] Figure 6 Schematic diagram of the disassembled structure of the arc-shaped slider and the slide rod in the present invention;

[0026] Figure 7 For the present invention Figure 6 Schematic diagram of the enlarged structure at C in the middle;

[0027] Figure 8 Schematic diagram of the structure of the suction mechanism of the present invention;

[0028] Figure 9 For the present invention Figure 3 Schematic diagram of the enlarged structure at D in the middle;

[0029] Figure 10 For the present invention Figure 2 Schematic diagram of the enlarged structure at E in the middle.

[0030] Reference numerals:

[0031] 1. Bottom plate; 2. Guide cable; 3. Casing; 4. Collecting drum; 5. Roller frame; 6. Motor; 7. Roller; 8. Extension shaft; 9. Extension rod; 10. Positive brush; 11. Negative brush; 12. Positive slip ring; 13. Negative slip ring; 14. Wheel frame; 15. Guide wheel; 101. Vertical plate; 102. Pressure roller; 103. Side plate; 104. Circular guide rail; 105. Cam; 107. Arc slider; 108. Slide rod; 109. Press switch; 110. Switch Bracket; 111, roller; 112, locking bolt; 113, sleeve; 114, telescopic rod; 115, first spring; 201, driving pinion; 202, driven gearwheel; 203, transmission gearwheel; 204, transmission pinion; 301, piston; 302, water inlet pipe; 303, water outlet pipe; 304, armature; 305, second spring; 306, exhaust hole; 307, electromagnet; 401, straight slide; 402, rectangular slider; 403, pressing spring. DETAILED DESCRIPTION

[0032] The present invention is described in detail below, clearly and completely describing the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] The present invention provides an improved groundwater sampling device for environmental testing. The technical solution of the present invention is:

[0034] like Figures 1 to 10 As shown, an embodiment of the present invention provides a groundwater sample sampling device for environmental detection, comprising a base plate 1, and a guide cable 2 arranged on the base plate 1 through a winding device, the end of the guide cable 2 is connected to a casing 3, and a plurality of collecting cylinders 4 with a suction mechanism are arranged inside the casing 3. A wheel frame 14 is fixed to one end of the upper side of the base plate 1, and the top end of the wheel frame 14 is rotatably connected to a guide wheel 15 for supporting the guide cable 2; the suction mechanism includes a piston 301 (as shown in FIG. 1 ) with an armature 304 slidably arranged inside the collecting cylinder 4 Figure 8 As shown), an electromagnet 307 installed at the top inner side of the collecting tube 4, and a water inlet pipe 302 and a water outlet pipe 303 inserted at the lower end of the collecting tube 4; further comprising a trigger mechanism for measuring the movement stroke of the guide cable 2 and sequentially triggering multiple suction mechanisms; the trigger mechanism comprises two vertical plates 101 fixed to the upper side of the bottom plate 1, and two pressure wheels 102 (as shown) are rotatably arranged between the two vertical plates 101 Figure 4 As shown), a side plate 103 is fixed to one side of one vertical plate 101, and a cam 105 is rotatably connected to one side of the side plate 103. The cam 105 is transmission-connected to a pressure wheel 102 at the upper end through a gear reduction mechanism. A circular guide rail 104 concentric with the cam 105 is fixed to one side of the side plate 103. A plurality of arc-shaped sliders 107 are movably provided on the inner side of the circular guide rail 104. A press switch 109 is provided on one side of each arc-shaped slider 107. A slide rod 108 for pushing the press switch 109 is slidably connected to the inside of each arc-shaped slider 107. The two contacts of the plurality of press switches 109 are electrically connected to the wires in the guide cable 2 through a conductive structure.

[0035] Furthermore, the suction mechanism also includes two one-way valves installed oppositely on the inner sides of the water inlet pipe 302 and the water outlet pipe 303. The one-way valve on the inner side of the water inlet pipe 302 is directed toward the inner side of the collection tube 4, while the one-way valve on the inner side of the water outlet pipe 303 is directed toward the outer side of the collection tube 4. The mechanism also includes a second spring 305 elastically connecting the piston 301 to the inner top end of the collection tube 4.

[0036] When the circuit of the electromagnet 307 in the suction mechanism is closed, the electromagnet 307 is energized to generate electromagnetic suction on the armature 304, attracting the armature 304 to move toward the inner top of the collecting cylinder 4, and the armature 304 drives the piston 301 to move toward the inner top of the collecting cylinder 4. Since the conduction direction of the one-way valve located on the inner side of the water inlet pipe 302 points to the inner side of the collecting cylinder 4, and the conduction direction of the one-way valve located on the inner side of the water outlet pipe 303 points to the outer side of the collecting cylinder 4, when the piston 301 moves upward, the groundwater at the depth can be sucked into the inner lower end of the collecting cylinder 4 through the water inlet pipe 302, thereby realizing the collection of groundwater samples.

[0037] Furthermore, the winding device includes two roller frames 5 fixed to one end of the upper side of the bottom plate 1, a winding roller 7 is rotatably connected between the two roller frames 5, and a motor 6 for driving the winding roller 7 to rotate is installed on one side of one of the roller frames 5;

[0038] The motor 6 drives the winding roller 7 to rotate forward and reverse. When the winding roller 7 rotates forward, the outer guide cable 2 can be released, thereby placing the casing 3 and multiple collecting tubes 4 into the groundwater layer. When the winding roller 7 rotates reversely, the guide cable 2 can be reeled in, thereby taking the casing 3 and multiple collecting tubes 4 out of the groundwater layer to the ground.

[0039] Furthermore, the conductive structure includes an extension shaft 8 fixed to one end of the roller 7, an extension rod 9 fixed to one side of one of the roller frames 5 (such as Figure 9 As shown), the outer side of the extension rod 9 is provided with a brush group with the same number as the push switches 109, and the outer side of the extension shaft 8 is provided with a collector ring with the same number as the push switches 109. The brush group includes a positive brush 10 and a negative brush 11 fixed to the outer side of the extension rod 9. The positive brush 10 and the negative brush 11 are electrically connected to the contacts at both ends of the corresponding push switches 109, respectively. The collector ring includes a positive slip ring 12 and a negative slip ring 13 sleeved on the outer side of the extension shaft 8. The positive slip ring 12 and the negative slip ring 13 are connected in series to the electromagnet 307 circuit at the corresponding position through the wire in the base plate 1. The positive brush 10 and the negative brush 11 are respectively slidably adapted to the outer sides of the positive slip ring 12 and the negative slip ring 13;

[0040] Since the end of the guide cable 2 connected to the roller 7 rotates with the roller 7, the conductive structure is used to electrically connect the two contacts of the multiple push switches 109 to the rotating end of the rotating guide cable 2 to ensure stable current transmission.

[0041] Furthermore, the gear reduction mechanism includes a driving pinion 201 fixed to a pressure wheel 102 at the upper end, a driven large gear 202 fixed to the cam 105, a first coaxial gear set and a second coaxial gear set transmission-connected between the driving pinion 201 and the driven large gear 202, the first coaxial gear set and the second coaxial gear set both including a transmission large gear 203 and a transmission pinion 204 fixed to each other, the first coaxial gear set being rotationally connected to one side of the vertical plate 101, the second coaxial gear set being rotationally connected to one side of the side plate 103, the transmission large gear 203 in the first coaxial gear set being meshed with the driving pinion 201, and the transmission pinion 204 in the first coaxial gear set being meshed with the transmission large gear 203 in the second coaxial gear set, and the transmission pinion 204 in the second coaxial gear set being meshed with the driven large gear 202;

[0042] Through the gear reduction mechanism, the rapid rotation motion of the pressure wheel 102 can be converted into the slow rotation motion of the cam 105, so that each angle of rotation of each cam 105 can correspond to the number of rotations of the pressure wheel 102, thereby corresponding to the moving stroke of the guide cable 2, and then corresponding to the depth of the casing 3 and multiple collecting tubes 4 in the groundwater layer.

[0043] Furthermore, a limiting mechanism is provided between each slide rod 108 and each arc-shaped slider 107. The limiting mechanism includes two grooves symmetrically provided on one side of the arc-shaped slider 107. Two sleeves 113 are symmetrically rotatably connected to the inner sides of the two grooves. A telescopic rod 114 is slidably inserted into one end of each sleeve 113. One end of each telescopic rod 114 is rotatably connected to the outer side of the slide rod 108. The two telescopic rods 114 are elastically connected to the ends of the two sleeves 113 respectively through a first spring 115.

[0044] Through the limiting mechanism, when the slide rod 108 is pushed by the cam 105, one end of the slide rod 108 can always keep in contact with the pressing end of the push switch 109, which has the effect of "automatic attraction", so that the pressing end of the push switch 109 is always kept in a pressed state, and the two contacts of the push switch 109 are always kept in contact, so that the circuit of the corresponding connected electromagnet 307 is always kept closed, thereby ensuring that the groundwater sample sucked into the inside of the collecting tube 4 does not leak.

[0045] Furthermore, both ends of each arc-shaped slider 107 are threadedly connected with locking bolts 112, and the end of each locking bolt 112 is fixed with a knob;

[0046] By sliding the arc-shaped slider 107, it can be moved to positions at different angles inside the circular guide rail 104. By rotating the locking bolt 112, one end of the locking bolt 112 is pressed against the inner side of the circular guide rail 104, and multiple arc-shaped sliders 107 can be fixed at positions at different angles inside the circular guide rail 104, so that the slide rod 108 can be fixed at positions at different angles inside the circular guide rail 104. Different angles correspond to the casing 3 and multiple collecting tubes 4 in groundwater layers at different depths. According to the depth of the groundwater layer at different positions, the position of each slide rod 108 can be flexibly adjusted, so that multiple suction mechanisms can be controlled to start at a specified depth, thereby improving the sampling accuracy of groundwater samples.

[0047] Furthermore, one end of each slide bar 108 is rotatably connected to a roller 111 that is adapted to roll with the outer side of the cam 105;

[0048] One end of the slide bar 108 rolls with the outer side of the cam 105 via the roller 111, which can reduce the friction between the one end of the slide bar 108 and the cam 105 and improve the operating stability of the slide bar 108 and the cam 105 in the trigger mechanism.

[0049] Furthermore, a straight sliding groove 401 is provided at the position of the lower end pressure wheel 102 in each of the two vertical plates 101 (eg Figure 10As shown), the inner sides of the two straight slide grooves 401 are slidably connected to rectangular sliders 402, and the lower ends of the two rectangular sliders 402 are elastically connected to the lower ends of the two straight slide grooves 401 respectively through pressing springs 403, and both ends of the pressure wheel 102 are rotatably connected to the two rectangular sliders 402 respectively through rotating shafts;

[0050] The two pressing springs 403 respectively apply an upward thrust to the two rectangular sliders 402, and the two rectangular sliders 402 apply an upward thrust to a pressure wheel 102 at the lower end, so that the pressure wheel 102 at the lower end can press the guide cable 2 against the outer side of the pressure wheel 102 at the upper end, thereby increasing the friction between the two pressure wheels 102 and the guide cable 2, avoiding slippage between the two pressure wheels 102 and the guide cable 2, and making the moving stroke of the guide cable 2 and the rotation angle of the cam 105 accurately correspond, so that multiple suction mechanisms can be started accurately at the specified groundwater layer depth to extract groundwater samples.

[0051] Working principle: Before use, the casing 3 is inserted into the pre-drilled water well, and then the multiple slide bars 108 in the trigger mechanism are pressed in the direction of the cam 105, so that one end of the multiple slide bars 108 can be separated from the pressing ends of the multiple press switches 109 respectively. At this time, the multiple press switches 109 are not triggered, and then the motor 6 in the winding device is controlled to drive the winding roller 7 to rotate. The winding roller 7 rotates and gradually releases the guide cable 2 wrapped around its outside. Under the action of gravity of the casing 3 and the multiple collecting drums 4 inside, the guide cable 2 can be driven to extend into the well. The casing 3 and the collecting drum 4 gradually sink into the well until they reach the groundwater layer.

[0052] When the guide cable 2 moves, it will drive the two pressure wheels 102 in the trigger mechanism to rotate in opposite directions. When the pressure wheel 102 at the upper end rotates, it will drive the driving pinion 201 in the gear reduction mechanism to rotate. The driving pinion 201 drives the transmission large gear 203 of the first coaxial gear set to rotate at a slower speed. The transmission large gear 203 drives a transmission small gear 204 at the end to rotate at the same speed. The transmission small gear 204 drives the transmission large gear 203 of the second coaxial gear set to rotate at an even slower speed. The transmission large gear 203 drives a transmission small gear 204 at the end to rotate at the same speed. The transmission small gear 204 drives the driven large gear 202 to rotate at a slower speed. The driven large gear 20 2 drives the cam 105 to rotate at a constant speed. Due to the multi-stage deceleration effect, the high-speed rotating pressure wheel 102 can drive the cam 105 to rotate slowly at an extremely slow speed. When the casing 3 moves down to different depths, it will drive the guide cable 2 to move different strokes, thereby driving the pressure wheel 102 to rotate different circles. The rotation angle of the cam 105 can be obtained by calculation. The sliding arc-shaped slider 107 can move multiple arc-shaped sliders 107 to positions of different angles inside the circular guide rail 104. By rotating the locking bolt 112 so that one end of the locking bolt 112 is pressed against the inner side of the circular guide rail 104, the multiple arc-shaped sliders 107 can be fixed at positions of different angles inside the circular guide rail 104.

[0053] Therefore, different depths of the casing 3 can correspond to different angles of rotation of the cam 105. When the raised end of the cam 105 rotates to different positions of the slide bar 108, different suction mechanisms can be triggered to operate. As the casing 3 continues to move downward, the cam 105 can be driven to rotate and trigger multiple suction mechanisms in sequence, so that the multiple suction mechanisms are started and operated at different depths, and groundwater at different depths is sucked into the inner sides of multiple collection tubes 4 respectively.

[0054] Specifically, as the cam 105 slowly rotates, when the raised end of the cam 105 approaches any one of the slide bars 108, it pushes the slide bar 108 to move along the inside of the arc-shaped slider 107. Since the push switch 109 is fixed to the arc-shaped slider 107 through the switch bracket 110, when the slide bar 108 moves, one end of the slide bar 108 pushes the pressing end of the push switch 109 at the corresponding position, pressing the pressing end of the push switch 109, thereby closing the two contacts in the push switch 109. Since the positive brush 10 and the negative brush 11 in the conductive structure are electrically connected to the contacts at both ends of the corresponding push switch 109, the positive slip ring 12 and the negative slip ring 13 are connected in series to the electromagnet 307 circuit at the corresponding position through the wire in the bottom plate 1, and the positive brush 10 and the negative brush 11 are respectively slidably adapted to the outer sides of the positive slip ring 12 and the negative slip ring 13, when the two contacts in the push switch 109 are closed, the corresponding positive brush 10 and The negative electrode brush 11 is turned on, thereby turning on the corresponding positive electrode slip ring 12 and the negative electrode slip ring 13, and then closing the circuit loop of the corresponding electromagnet 307, so that the electromagnet 307 is energized to generate electromagnetic attraction on the armature 304, attracting the armature 304 to move toward the inner top of the collecting cylinder 4. The armature 304 drives the piston 301 to move toward the inner top of the collecting cylinder 4. Since the conduction direction of the one-way valve located on the inner side of the water inlet pipe 302 points to the inner side of the collecting cylinder 4, the one-way valve located on the inner side of the water outlet pipe 302 is turned on. The one-way valve inside the water pipe 303 is directed toward the outside of the collecting cylinder 4. Therefore, when the piston 301 moves upward, groundwater at the depth can be sucked into the inner lower end of the collecting cylinder 4 through the water inlet pipe 302, thereby collecting groundwater samples. The upper end of the collecting cylinder 4 is provided with a plurality of exhaust holes 306. When the piston 301 moves upward, the air in the inner upper end of the collecting cylinder 4 can be discharged to the outside, so that the groundwater can be smoothly sucked into the inner lower end space of the collecting cylinder 4.

[0055] A limiting mechanism is provided between each slide bar 108 and the corresponding arc-shaped slider 107. When the slide bar 108 is not pushed, the two first springs 115 in the limiting mechanism push the two telescopic rods 114 to extend outward the longest, thereby applying a thrust directed to the cam 105 to the slide bar 108. When the slide bar 108 moves after being pushed by the cam 105, the slide bar 108 pushes the two telescopic rods 114 to move toward the inner sides of the two sleeves 113 at the same time, and compresses the two first springs 115 at the same time. At the same time, the connection points of the two telescopic rods 114 and the slide bar 108 also move synchronously, and the two sleeves 113 and the two telescopic rods 114 will gradually rotate from the inclined angle to the vertical angle. In this process, the slide bar 108 will be pushed in the opposite direction by the two first springs 115. As the slide bar 108 continues to move, When the two sleeves 113 and the two telescopic rods 114 continue to rotate as the movement continues, the two sleeves 113 and the two telescopic rods 114 rotate from a vertical angle toward the position of the press switch 109. At this time, the two telescopic rods 114 gradually extend from the inner sides of the two sleeves 113. At the same time, the two first springs 115 apply a thrust to the slide bar 108 toward the press switch 109, so that one end of the slide bar 108 is always pressed against the pressing end of the press switch 109. When the raised end of the cam 105 no longer applies a thrust to the slide bar 108, it can still make one end of the slide bar 108 press against the pressing end of the press switch 109, so that the two contacts of the press switch 109 are always kept in contact, so that the circuit of the correspondingly connected electromagnet 307 is always kept closed, thereby ensuring that the groundwater sample sucked into the inner side of the collecting tube 4 does not leak.

[0056] When multiple collecting cylinders 4 complete collecting groundwater at different depths, the motor 6 controlling the winding device drives the winding roller 7 to rotate in the opposite direction, thereby retracting the guide cable 2 and rewinding it on the outside of the winding roller 7. The guide cable 2 then pulls the casing 3 at the end and the multiple collecting cylinders 4 inside it out of the ground. If it is necessary to take out the groundwater sample inside the collecting cylinder 4, it is only necessary to push the corresponding sliding rod 108 in the opposite direction to separate one end of the sliding rod 108 from the pressing end of the pressing switch 109, thereby resetting the pressing switch 109, thereby disconnecting the circuit loop of the electromagnet 307, so that the electromagnet 307 no longer applies electromagnetic attraction to the piston 301. At this time, under the elastic force of the second spring 305, the piston 301 is pushed downward. When the piston 301 moves downward, the groundwater sample extracted from the lower end of the inner side of the collecting cylinder 4 can be discharged outward through the outlet pipe 303, thereby collecting the groundwater sample.

[0057] The above description is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A groundwater sampling device for environmental detection, comprising a bottom plate, characterized in that: It also includes a guide cable arranged on the bottom plate through a reeling device, the end of the guide cable is connected to a casing, and a plurality of collecting cylinders with suction mechanisms are arranged inside the casing; The suction mechanism includes a piston with an armature slidably arranged on the inner side of the collection tube, an electromagnet installed on the top of the inner side of the collection tube, and a water inlet pipe and a water outlet pipe inserted at the lower end of the collection tube; Also included is a trigger mechanism for measuring the travel of the guide cable and sequentially triggering the plurality of suction mechanisms; The trigger mechanism includes two vertical plates fixed to the upper side of the base plate, two pressure wheels are rotatably provided between the two vertical plates, and the guide cable passes through the two pressure wheels to move, a side plate is fixed to one side of one of the vertical plates, and a cam is rotatably connected to one side of the side plate. The cam is connected to a pressure wheel at the upper end through a gear reduction mechanism, and a circular guide rail concentric with the cam is fixed to one side of the side plate, and a plurality of arc-shaped sliders are movably provided on the inner side of the circular guide rail, and a press switch is provided on one side of each arc-shaped slider, and a slide rod for pushing the press switch is slidably connected to the inside of each arc-shaped slider, and two contacts of the plurality of press switches are electrically connected to the wire in the guide cable through a conductive structure. When the two contacts in the press switch are closed, the circuit loop of a correspondingly connected electromagnet is closed; The gear reduction mechanism includes a driving pinion fixed to a pressure wheel at the upper end, a driven large gear fixed to the cam, a first coaxial gear set and a second coaxial gear set transmission-connected between the driving pinion and the driven large gear, the first coaxial gear set and the second coaxial gear set both including a transmission large gear and a transmission pinion fixed to each other, the first coaxial gear set being rotationally connected to one side of the vertical plate, the second coaxial gear set being rotationally connected to one side of the side plate, the transmission large gear in the first coaxial gear set being meshed with the driving pinion, and the transmission pinion in the first coaxial gear set being meshed with the transmission large gear in the second coaxial gear set, and the transmission pinion in the second coaxial gear set being meshed with the driven large gear; A limiting mechanism is provided between each slide rod and each arc-shaped slider, the limiting mechanism comprising two grooves symmetrically provided on one side of the arc-shaped slider, the inner sides of the two grooves being symmetrically rotatably connected to two sleeves, one end of each sleeve being slidably inserted with a telescopic rod, one end of each telescopic rod being rotatably connected to the outer side of the slide rod, and the two telescopic rods being elastically connected to the ends of the two sleeves respectively through a first spring; A straight sliding groove is provided inside the two vertical plates at the position corresponding to a pressure wheel at the lower end. The inner sides of the two straight sliding grooves are slidably connected with rectangular sliders. The lower ends of the two rectangular sliders are elastically connected to the lower ends of the two straight sliding grooves through pressing springs, and the two ends of the pressure wheel are rotatably connected to the two rectangular sliders through rotating shafts.

2. The groundwater sampling device for environmental testing according to claim 1, characterized in that: The suction mechanism also includes two one-way valves installed in opposite directions on the inside of the water inlet pipe and the water outlet pipe. The conduction direction of the one-way valve located on the inside of the water inlet pipe points to the inside of the collecting cylinder, and the conduction direction of the one-way valve located on the inside of the water outlet pipe points to the outside of the collecting cylinder. It also includes a second spring that elastically connects the piston to the inner top end of the collecting cylinder.

3. The groundwater sampling device for environmental testing according to claim 1, characterized in that: The winding device includes two roller frames fixed on one end of the upper side of the bottom plate, a winding roller is rotatably connected between the two roller frames, and a motor for driving the winding roller to rotate is installed on one side of one of the roller frames.

4. The groundwater sampling device for environmental testing according to claim 3, characterized in that: The conductive structure includes an extension shaft fixed at one end of the winding roller and an extension rod fixed at one side of one of the roller frames. A brush group with the same number as the push switches is provided on the outside of the extension rod, and a collector ring with the same number as the push switches is provided on the outside of the extension shaft. The brush group includes a positive brush and a negative brush fixed on the outside of the extension rod. The positive brush and the negative brush are electrically connected to the contacts at both ends of the corresponding push switches respectively. The collector ring includes a positive slip ring and a negative slip ring sleeved on the outside of the extension shaft. The positive slip ring and the negative slip ring are connected in series to the electromagnet circuit at the corresponding position through the wire in the base plate. The positive brush and the negative brush are respectively slidably adapted to the outer sides of the positive slip ring and the negative slip ring.

5. The groundwater sampling device for environmental testing according to claim 1, characterized in that: Both ends of each arc-shaped sliding block are threadedly connected with locking bolts, and the end of each locking bolt is fixed with a knob.

6. The groundwater sampling device for environmental testing according to claim 1, characterized in that: A wheel frame is fixed to one end of the upper side of the bottom plate, and the top end of the wheel frame is rotatably connected to a guide wheel for supporting a guide cable.

7. The groundwater sampling device for environmental testing according to claim 1, characterized in that: One end of each slide bar is rotatably connected to a roller which is adapted to roll with the outer side of the cam.

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