Underground water drilling and sampling device

Abstract

The invention provides an underground water drilling and sampling device, and belongs to the technical field of soil drilling. The underground water drilling and sampling device comprises a supporting frame, a lifting plate and a drilling mechanism, the lifting plate is slidably mounted on the side wall of the supporting frame, a lead screw is rotatably mounted in an inner cavity of the supporting frame, and a threaded block is fixedly mounted on the surface of the lifting plate and is in threaded connection with the lead screw. The drilling mechanism is arranged, a second motor can drive a second gear to rotate so as to drive a first gear boss to rotate, spline teeth and a drill rod are driven to rotate through a spline groove, meanwhile, a first motor drives a lead screw to rotate, a threaded block drives a lifting plate to move downwards, and drilling can be conducted through a drill bit; when the first arc-shaped protruding block makes contact with the second arc-shaped protruding block, the driving frame can be driven to drive the drill rod to move upwards, and therefore the first connecting rod drives the arc-shaped reaming pressing plate to extrude outwards, the well wall is compacted, collapse is prevented, and use is convenient.

Description

Technical Field

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

[0002] In order to evaluate the quality of groundwater and determine the types and concentrations of various substances and whether there are pollutants in it, drilling equipment is usually used to sample groundwater. By selecting appropriate sampling points on the ground according to factors such as the direction of groundwater flow, geological structure, possible sources of pollution, etc., a drilling machine is used to drill holes at the sampling points, and then groundwater samples are completely collected through sampling tubes and sampling pumps to evaluate the substances in the groundwater and whether there are pollutants, as well as their types and concentrations. This helps to understand whether the groundwater is suitable as a source of drinking water or for agricultural and industrial purposes, determine the source of pollutants and trace the location of pollution sources, formulate appropriate pollution control strategies, and take necessary remedial measures.

[0003] When drilling with existing drilling devices, as the drill bit goes deeper, the soil above the hole tends to collapse, affecting subsequent sampling work. There are also methods to protect the pipe wall by inserting a protective tube, but the operation is relatively complicated and affects the drilling efficiency. Summary of the Invention

[0004] In order to make up for the above deficiencies, the present invention provides a groundwater drilling sampling device that overcomes the above technical problems or at least partially solves the above problems.

[0005] The purpose of the present invention is achieved through the following technical measures: The present invention provides a groundwater drilling sampling device, comprising a support frame, a lifting plate and a drilling mechanism, wherein the lifting plate is slidably mounted on the side wall of the support frame, a screw is rotatably mounted in the inner cavity of the support frame, a threaded block is fixedly mounted on the surface of the lifting plate, the threaded block is threadedly connected to the screw, a guide rod is symmetrically fixedly mounted in the inner cavity of the support frame, the guide rod is slidably connected to the lifting plate, a first motor is fixedly mounted on the top of the support frame, an output end of the first motor is fixedly connected to the screw, and the drilling mechanism comprises: The first gear is rotatably mounted on the lower part of the lifting plate, and a boss is fixedly mounted on the surface of the first gear.

[0006] The drill rod is slidably inserted into the inner cavity of the first gear, and spline teeth are symmetrically fixedly installed on the surface of the drill rod. The first gear and the inner cavity of the boss are provided with spline grooves, and the spline teeth are clamped in the inner cavity of the spline grooves.

[0007] A drill bit is fixedly mounted on one end of the drill rod.

[0008] Sampling mechanism: a sampling mechanism is installed on the surface of the lifting plate for extracting water samples.

[0009] As an improvement: a second gear is rotatably installed at the lower part of the lifting plate, the second gear is engaged with the first gear, a second motor is fixedly installed on the surface of the lifting plate, and the output end of the second motor is fixedly connected to the second gear.

[0010] As an improvement: a limit seat is symmetrically fixedly installed on the surface of the lifting plate, a drive frame is slidably installed on the surface of the limit seat, a first limit groove is opened in the inner cavity of the limit seat, a first clamping block is fixedly installed on the side wall of the drive frame, the first clamping block is slidably connected to the first limit groove, and the drive frame is rotatably connected to the drill rod.

[0011] As an improvement: a first arc-shaped protrusion is symmetrically fixedly installed on the surface of the boss, and a second arc-shaped protrusion is symmetrically fixedly installed on the lower part of the driving frame.

[0012] As an improvement: a number of arc-shaped hole-expanding pressure plates are sleeved on the surface of the drill rod, a slider is fixedly installed on the top of the arc-shaped hole-expanding pressure plate, a number of sliding grooves are opened at the lower part of the first gear, the slider is slidably connected to the sliding groove, a first connecting ring is fixedly installed on the surface of the drill rod, and a first connecting rod is rotatably installed between the first connecting ring and the arc-shaped hole-expanding pressure plate.

[0013] As an improvement: the sampling mechanism includes a sampling cylinder, a piston and an eccentric shaft. The sampling cylinder is fixedly mounted on the side wall of the lifting plate. A piston is slidably mounted in the inner cavity of the sampling cylinder. An eccentric shaft is fixedly mounted at a non-center position of the second gear. A second connecting rod is rotatably mounted between the eccentric shaft and the piston. A first one-way valve and a second one-way valve are mounted on the side wall of the sampling cylinder.

[0014] As an improvement: a sampling tube is fixedly installed in the inner cavity of the drill rod, a rotary joint is rotatably installed on the top of the sampling tube, a water pipe is connected between the rotary joint and the second one-way valve, a water accumulation chamber is opened in the inner cavity of the drill bit, and the other end of the sampling tube is inserted into the water accumulation chamber.

[0015] As an improvement: a plurality of through holes are opened on the side wall of the drill bit, the through holes are connected to the water accumulation chamber, the inner cavity of the water accumulation chamber is installed with a permeable membrane, a scraper ring is slidably installed in the inner cavity of the drill bit, a third connecting rod is symmetrically fixedly installed on the surface of the scraper ring, a pressure ring is sleeved on the surface of the drill rod, the other end of the third connecting rod is fixedly connected to the pressure ring, a second connecting ring is fixedly installed on the surface of the third connecting rod, a spring is sleeved on the surface of the third connecting rod, one end of the spring is fixedly connected to the second connecting ring, and the other end of the spring is fixedly connected to the drill bit.

[0016] As an improvement: the side wall of the support frame is installed with a positioning mechanism for stabilizing the support frame, the positioning mechanism includes a support, a positioning rod and a third gear, the support is symmetrically slidably installed on the side wall of the support frame, the positioning rod is fixedly installed on the lower part of the support, the side wall of the support frame is symmetrically opened with a second limiting groove, the side wall of the support is symmetrically fixedly installed with a second clamping block, and the second clamping block is slidably connected to the second limiting groove.

[0017] As an improvement: a first tooth plate is fixedly installed on the side wall of the support, a third gear is symmetrically installed on the inner cavity of the support frame, the third gear is engaged with the first tooth plate, and a second tooth plate is fixedly installed on the side wall of the lifting plate, the second tooth plate is engaged with the third gear.

[0018] The present invention provides a groundwater drilling sampling device, which has the following beneficial effects: By setting a drilling mechanism, the second motor can drive the second gear to rotate, thereby driving the first gear boss to rotate, and driving the spline teeth and the drill rod to rotate through the spline groove. At the same time, the first motor drives the screw to rotate, and the lifting plate is driven downward by the threaded block to drill a hole through the drill bit; when the first arc convex block contacts the second arc convex block, the driving frame can be driven to drive the drill rod to move upward, thereby driving the arc reaming pressure plate outward through the first connecting rod to compact the well wall to prevent collapse, which is convenient for use. By setting a sampling mechanism, when the drill rod is lifted and moved, the pressure ring can be squeezed by the arc reaming pressure plate. When the drill rod descends, the pressure ring is driven downward by the arc reaming pressure plate, the spring is compressed, and the scraper ring scrapes the mud sticking to the side wall of the through hole. When the drill rod rises, The arc-shaped hole-expanding pressure plate releases the squeeze on the pressure ring, the spring resets, and drives the scraper ring to reset, completing the cleaning of the through hole. When the accumulated water in the drill hole enters the water accumulation chamber through the through hole, the eccentric shaft is driven to rotate by the second gear, and the piston is driven to move back and forth in the sampling cylinder by the second connecting rod, so that the first one-way valve and the second one-way valve are alternately conductive, and the water sample in the water accumulation chamber is drawn into the sampling cylinder through the sampling tube and discharged by the first one-way valve, thereby realizing sampling while drilling. By setting a positioning mechanism, the first motor drives the lifting plate to descend. When the second tooth plate contacts the third gear, it can drive the third gear to rotate, thereby driving the first tooth plate to drive the support to descend, inserting the positioning rod into the soil, increasing the stability of the support frame, and avoiding the increase in resistance to the drill rod caused by the deepening of the drill bit, which causes the support frame to shake. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view three-dimensional structural schematic diagram of the present invention.

[0020] Figure 2 It is a schematic side view of the three-dimensional structure of the present invention.

[0021] Figure 3It is a side structural schematic diagram of the present invention.

[0022] Figure 4 It is a bottom view structural schematic diagram of the present invention.

[0023] Figure 5 It is a schematic diagram of the cross-sectional structure of the lifting plate in the present invention.

[0024] Figure 6 It is a schematic diagram of the explosion structure of the drilling mechanism in the present invention.

[0025] Figure 7 It is a schematic diagram of the cross-sectional structure of the drill bit in the present invention.

[0026] Figure 8 for Figure 7 Schematic diagram of the enlarged structure at point A in the middle.

[0027] Figure 9 It is a schematic diagram of a partial explosion structure of the sampling mechanism in the present invention.

[0028] Figure 10 It is a schematic diagram of the cross-sectional structure of the support frame in the present invention.

[0029] Figure 11 for Figure 10 Schematic diagram of the enlarged structure at point B in the middle.

[0030] In the figure: 1, support frame; 2, lifting plate; 3, screw rod; 4, threaded block; 5, guide rod; 6, first motor; 7, drilling mechanism; 701, first gear; 702, second gear; 703, second motor; 704, boss; 705, drill rod; 706, spline teeth; 707, spline groove; 708, limit seat; 709, drive frame; 710, first limit groove; 711, first clamping block; 712, first arc-shaped protrusion; 713, second arc-shaped protrusion; 714, drill bit; 715, arc-shaped reaming pressure plate; 716, slider; 717, slide groove; 718, first connecting ring; 719, first connecting rod; 8, Sampling mechanism; 801, sampling cylinder; 802, piston; 803, eccentric shaft; 804, second connecting rod; 805, first one-way valve; 806, second one-way valve; 807, sampling tube; 808, rotary joint; 809, water pipe; 810, water accumulation chamber; 811, through hole; 812, permeable membrane; 813, scraper ring; 814, third connecting rod; 815, pressure ring; 816, second connecting ring; 817, spring; 9, positioning mechanism; 901, support; 902, positioning rod; 903, second limiting groove; 904, second clamping block; 905, first gear plate; 906, third gear; 907, second gear plate. DETAILED DESCRIPTION

[0031] Reference Figures 1 to 11As shown, a groundwater drilling sampling device includes a support frame 1, a lifting plate 2 and a drilling mechanism 7. The lifting plate 2 is slidably installed on the side wall of the support frame 1 and is used to install a drill rod 705. A screw rod 3 is rotatably installed in the inner cavity of the support frame 1, and a threaded block 4 is fixedly installed on the surface of the lifting plate 2. The threaded block 4 is threadedly connected to the screw rod 3 and is used to drive the lifting plate 2. A guide rod 5 is symmetrically fixedly installed in the inner cavity of the support frame 1, and the guide rod 5 is slidably connected to the lifting plate 2. A first motor 6 is fixedly installed on the top of the support frame 1 for driving the screw rod 3, and the output end of the first motor 6 is fixedly connected to the screw rod 3.

[0032] Reference Figures 1 to 6 As shown, in a preferred embodiment, the drilling mechanism 7 includes a first gear 701, a drill rod 705 and a drill bit 714. The first gear 701 is rotatably mounted on the lower part of the lifting plate 2, and the second gear 702 is rotatably mounted on the lower part of the lifting plate 2. The second gear 702 is meshed with the first gear 701. A second motor 703 is fixedly mounted on the surface of the lifting plate 2. The output end of the second motor 703 is fixedly connected to the second gear 702 for driving the second gear 702. A boss 704 is fixedly mounted on the surface of the first gear 701. The drill rod 705 is slidably inserted into the inner cavity of the first gear 701. Spline teeth 706 are symmetrically fixedly mounted on the surface of the drill rod 705. Spline grooves 707 are provided in the inner cavities of the first gear 701 and the boss 704. The spline teeth 706 are clamped in the inner cavity of the spline groove 707. The drill bit 714 is fixedly mounted on one end of the drill rod 705 for drilling.

[0033] Reference Figures 1 to 6 As shown, in a preferred embodiment, the lifting plate 2 is symmetrically fixedly installed with a limit seat 708 on the surface of the limit seat 708, and a driving frame 709 is slidably installed on the surface of the limit seat 708. The inner cavity of the limit seat 708 is provided with a first limit groove 710, and the side wall of the driving frame 709 is fixedly installed with a first clamping block 711. The first clamping block 711 is slidably connected to the first limit groove 710. The driving frame 709 is rotatably connected to the drill rod 705 for driving the drill rod 705 to move up and down. The surface of the boss 704 is symmetrically fixedly installed with a first arc-shaped protrusion 712. The driving frame 7 09 A second arc-shaped protrusion 713 is symmetrically fixedly installed at the lower part. The second motor 703 can drive the second gear 702 to rotate, thereby driving the boss 704 of the first gear 701 to rotate, and driving the spline teeth 706 and the drill rod 705 to rotate through the spline groove 707, and drilling is performed through the drill bit 714. When the first arc-shaped protrusion 712 contacts the second arc-shaped protrusion 713, the driving frame 709 can be driven to drive the drill rod 705 to move upward. After the first arc-shaped protrusion 712 is separated from the second arc-shaped protrusion 713, the drill rod 705 descends.

[0034] Reference Figures 1 to 6As shown, in a preferred embodiment, a plurality of arc-shaped reaming pressure plates 715 are sleeved on the surface of the drill rod 705 for compacting the well wall to prevent collapse. A slider 716 is fixedly installed on the top of the arc-shaped reaming pressure plate 715, and a plurality of slide grooves 717 are provided at the lower part of the first gear 701. The slider 716 is slidably connected to the slide groove 717. A first connecting ring 718 is fixedly installed on the surface of the drill rod 705. A first connecting rod 719 is rotatably installed between the first connecting ring 718 and the arc-shaped reaming pressure plate 715 for driving the arc-shaped reaming pressure plate 715 to extrude outward.

[0035] In a preferred embodiment, when in use, the second motor 703 can drive the second gear 702 to rotate, thereby driving the first gear 701 boss 704 to rotate, and driving the spline teeth 706 and the drill rod 705 to rotate through the spline groove 707. At the same time, the first motor 6 drives the screw rod 3 to rotate, and the threaded block 4 drives the lifting plate 2 to move downward, so that drilling can be performed through the drill bit 714; when the first arc-shaped protrusion 712 contacts the second arc-shaped protrusion 713, the driving frame 709 can be driven to drive the drill rod 705 to move upward, thereby driving the arc-shaped reaming pressure plate 715 outward through the first connecting rod 719 to compact the well wall to prevent collapse, which is convenient for use; and when the first arc-shaped protrusion 712 is disengaged from the second arc-shaped protrusion 713, the drill rod 705 descends, and can also produce an impact effect on the drill bit 714, thereby improving drilling efficiency.

[0036] Reference Figures 1 to 9 As shown, in a preferred embodiment, a sampling mechanism 8 is installed on the surface of the lifting plate 2 for extracting water samples. The sampling mechanism 8 includes a sampling cylinder 801, a piston 802 and an eccentric shaft 803. The sampling cylinder 801 is fixedly installed on the side wall of the lifting plate 2 for extracting water. The piston 802 is slidably installed in the inner cavity of the sampling cylinder 801. The eccentric shaft 803 is fixedly installed at a non-center position of the second gear 702. A second connecting rod 804 is rotatably installed between the eccentric shaft 803 and the piston 802 for driving the piston 802 to reciprocate in the sampling cylinder 801. A first one-way valve 805 and a second one-way valve 806 are installed on the side wall of the sampling cylinder 801. The first one-way valve 805 is unidirectionally conducted toward the outer wall of the sampling cylinder 801 for water discharge, and the second one-way valve 806 is unidirectionally conducted toward the inner wall of the sampling cylinder 801 for water intake.

[0037] Reference Figures 1 to 9 As shown, in a preferred embodiment, a sampling tube 807 is fixedly installed in the inner cavity of the drill rod 705, a rotary joint 808 is rotatably installed on the top of the sampling tube 807, a water pipe 809 is connected between the rotary joint 808 and the second one-way valve 806, and a water accumulation chamber 810 is opened in the inner cavity of the drill bit 714 for accumulating sample water, and the other end of the sampling tube 807 is inserted into the water accumulation chamber 810.

[0038] Reference Figures 1 to 9As shown, in a preferred embodiment, a plurality of through holes 811 are provided on the side wall of the drill bit 714, and the through holes 811 are connected to the water accumulation chamber 810 for guiding the water accumulated in the drill hole into the water accumulation chamber 810. A permeable membrane 812 is installed in the inner cavity of the water accumulation chamber 810 for filtering the accumulated water. A scraper ring 813 is slidably installed in the inner cavity of the drill bit 714 for cleaning the soil on the surface of the through hole 811. A third connecting rod 814 is symmetrically fixedly installed on the surface of the scraper ring 813. The surface of the drill rod 705 is sleeved with a The pressure ring 815 is used to drive the scraper ring 813. The other end of the third connecting rod 814 is fixedly connected to the pressure ring 815. The second connecting ring 816 is fixedly installed on the surface of the third connecting rod 814. The surface of the third connecting rod 814 is sleeved with a spring 817, which is used to drive the pressure ring 815 to reset. One end of the spring 817 is fixedly connected to the second connecting ring 816, and the other end of the spring 817 is fixedly connected to the drill bit 714. Under the action of the spring 817, the pressure ring 815 is driven to drive the scraper ring 813 to move upward.

[0039] In a preferred embodiment, when in use, when the drill rod 705 is lifted and lowered, the pressure ring 815 can be squeezed by the arc-shaped reaming pressure plate 715. When the drill rod 705 descends, the pressure ring 815 is driven downward by the arc-shaped reaming pressure plate 715, the spring 817 is compressed, and the scraper ring 813 scrapes the mud stuck on the side wall of the through hole 811. When the drill rod 705 rises, the arc-shaped reaming pressure plate 715 releases the squeezing of the pressure ring 815, the spring 817 is reset, and the scraper ring 813 is driven to return to the original position. Position, complete the cleaning of the through hole 811, when the accumulated water in the drill hole enters the water chamber 810 through the through hole 811, the eccentric shaft 803 is driven to rotate by the second gear 702, and the piston 802 is driven to move back and forth in the sampling cylinder 801 by the second connecting rod 804, so that the first one-way valve 805 and the second one-way valve 806 are alternately connected, and the water sample in the water chamber 810 is drawn into the sampling cylinder 801 through the sampling tube 807 and discharged by the first one-way valve 805, so as to realize sampling while drilling.

[0040] Reference Figures 1 to 11 As shown, in a preferred embodiment, a positioning mechanism 9 is installed on the side wall of the support frame 1 for stabilizing the support frame 1. The positioning mechanism 9 includes a support 901, a positioning rod 902 and a third gear 906. The support 901 is symmetrically slidably installed on the side wall of the support frame 1. A positioning rod 902 is fixedly installed at the lower part of the support 901 for inserting into the soil to improve the stability of the support frame 1. A second limiting groove 903 is symmetrically opened on the side wall of the support frame 1. A second clamping block 904 is symmetrically fixedly installed on the side wall of the support 901. The second clamping block 904 is slidably connected to the second limiting groove 903.

[0041] Reference Figures 1 to 11As shown, in a preferred embodiment, a first tooth plate 905 is fixedly installed on the side wall of the support 901 for driving the support 901, and a third gear 906 is symmetrically installed on the inner cavity of the support frame 1 for rotation, and the third gear 906 is engaged with the first tooth plate 905. A second tooth plate 907 is fixedly installed on the side wall of the lifting plate 2, and the second tooth plate 907 is engaged with the third gear 906. When the lifting plate 2 descends, after the second tooth plate 907 contacts the third gear 906, the third gear 906 can be driven to rotate, thereby driving the first tooth plate 905 to drive the support 901 to descend, inserting the positioning rod 902 into the soil, and increasing the stability of the support frame 1.

[0042] In a preferred solution, when in use, the first motor 6 drives the lifting plate 2 to descend. When the second tooth plate 907 contacts the third gear 906, the third gear 906 can be driven to rotate, thereby driving the first tooth plate 905 to drive the support 901 to descend, inserting the positioning rod 902 into the soil, increasing the stability of the support frame 1, and avoiding the increase in resistance to the drill rod 705 caused by the penetration of the drill bit 714, which causes the support frame 1 to shake.

[0043] Working principle: When in use, the second motor 703 can drive the second gear 702 to rotate, thereby driving the first gear 701 boss 704 to rotate, and driving the spline teeth 706 and the drill rod 705 to rotate through the spline groove 707. At the same time, the first motor 6 drives the screw rod 3 to rotate, and the threaded block 4 drives the lifting plate 2 to move downward, so that the drill bit 714 can be used for drilling; when the first arc-shaped protrusion 712 contacts the second arc-shaped protrusion 713, the driving frame 709 can be driven to drive the drill rod 705 to move upward, thereby driving the arc-shaped reaming pressure plate 715 outward through the first connecting rod 719 to compact the well wall to prevent collapse, which is convenient for use; and when the first arc-shaped protrusion 712 is disengaged from the second arc-shaped protrusion 713, the drill rod 705 descends, and it can also produce an impact effect on the drill bit 714, thereby improving drilling efficiency.

[0044] When the drill rod 705 is lifted and lowered, the pressure ring 815 can be squeezed by the arc-shaped reaming pressure plate 715. When the drill rod 705 is lowered, the pressure ring 815 is driven downward by the arc-shaped reaming pressure plate 715, the spring 817 is compressed, and the scraper ring 813 scrapes the mud stuck on the side wall of the through hole 811. When the drill rod 705 is lifted and lowered, the arc-shaped reaming pressure plate 715 releases the squeezing of the pressure ring 815, the spring 817 is reset, and the scraper ring 813 is driven to reset, completing the through hole 811. 11. When the accumulated water in the borehole enters the water chamber 810 through the through hole 811, the eccentric shaft 803 is driven to rotate by the second gear 702, and the piston 802 is driven to move back and forth in the sampling cylinder 801 by the second connecting rod 804, so that the first one-way valve 805 and the second one-way valve 806 are alternately connected, and the water sample in the water chamber 810 is drawn into the sampling cylinder 801 through the sampling tube 807 and discharged by the first one-way valve 805, so as to realize sampling while drilling.

[0045] The first motor 6 drives the lifting plate 2 to descend. When the second tooth plate 907 contacts the third gear 906, the third gear 906 can be driven to rotate, thereby driving the first tooth plate 905 to drive the support 901 to descend, inserting the positioning rod 902 into the soil, increasing the stability of the support frame 1, and avoiding the increase in resistance to the drill rod 705 caused by the penetration of the drill bit 714, which may cause the support frame 1 to shake.

[0046] It should be noted that the first motor 6 and the second motor 703 are devices or equipment existing in the prior art, or are devices or equipment that can be realized in the prior art. Their power supply, specific composition and principles are clear to those skilled in the art, so they will not be described in detail.

Claims

1. A groundwater drilling sampling device, characterized in that: The invention comprises a support frame (1), a lifting plate (2) and a drilling mechanism (7), wherein the lifting plate (2) is slidably mounted on the side wall of the support frame (1), a screw rod (3) is rotatably mounted in the inner cavity of the support frame (1), a threaded block (4) is fixedly mounted on the surface of the lifting plate (2), and the threaded block (4) is threadedly connected to the screw rod (3), a guide rod (5) is symmetrically fixedly mounted in the inner cavity of the support frame (1), and the guide rod (5) is slidably connected to the lifting plate (2), a first motor (6) is fixedly mounted on the top of the support frame (1), and an output end of the first motor (6) is fixedly connected to the screw rod (3), and the drilling mechanism (7) comprises: A first gear (701), the first gear (701) being rotatably mounted on the lower portion of the lifting plate (2), and a boss (704) being fixedly mounted on the surface of the first gear (701); A drill rod (705), the drill rod (705) is slidably inserted into the inner cavity of the first gear (701), spline teeth (706) are symmetrically fixedly installed on the surface of the drill rod (705), the inner cavities of the first gear (701) and the boss (704) are provided with spline grooves (707), and the spline teeth (706) are clamped in the inner cavity of the spline grooves (707); A drill bit (714), the drill bit (714) being fixedly mounted on one end of the drill rod (705); A sampling mechanism (8) is installed on the surface of the lifting plate (2) for extracting water samples.

2. A groundwater drilling sampling device according to claim 1, characterized in that: A second gear (702) is rotatably mounted on the lower portion of the lifting plate (2), the second gear (702) being meshedly connected to the first gear (701), a second motor (703) is fixedly mounted on the surface of the lifting plate (2), and an output end of the second motor (703) is fixedly connected to the second gear (702).

3. A groundwater drilling sampling device according to claim 1, characterized in that: A limiting seat (708) is symmetrically fixedly installed on the surface of the lifting plate (2), a driving frame (709) is slidably installed on the surface of the limiting seat (708), a first limiting groove (710) is provided in the inner cavity of the limiting seat (708), a first clamping block (711) is fixedly installed on the side wall of the driving frame (709), the first clamping block (711) is slidably connected to the first limiting groove (710), and the driving frame (709) is rotatably connected to the drill rod (705).

4. A groundwater drilling sampling device according to claim 3, characterized in that: A first arc-shaped convex block (712) is symmetrically fixedly mounted on the surface of the boss (704), and a second arc-shaped convex block (713) is symmetrically fixedly mounted on the lower portion of the drive frame (709).

5. A groundwater drilling sampling device according to claim 4, characterized in that: The surface of the drill rod (705) is sleeved with a plurality of arc-shaped hole-expanding pressure plates (715), the top of the arc-shaped hole-expanding pressure plate (715) is fixedly mounted with a slider (716), the lower portion of the first gear (701) is provided with a plurality of slide grooves (717), the slider (716) is slidably connected to the slide grooves (717), the surface of the drill rod (705) is fixedly mounted with a first connecting ring (718), and a first connecting rod (719) is rotatably mounted between the first connecting ring (718) and the arc-shaped hole-expanding pressure plate (715).

6. A groundwater drilling sampling device according to claim 2, characterized in that: The sampling mechanism (8) comprises a sampling cylinder (801), a piston (802) and an eccentric shaft (803); the sampling cylinder (801) is fixedly mounted on the side wall of the lifting plate (2); the piston (802) is slidably mounted in the inner cavity of the sampling cylinder (801); the eccentric shaft (803) is fixedly mounted at a non-center position of the second gear (702); a second connecting rod (804) is rotatably mounted between the eccentric shaft (803) and the piston (802); and a first one-way valve (805) and a second one-way valve (806) are mounted on the side wall of the sampling cylinder (801).

7. A groundwater drilling sampling device according to claim 6, characterized in that: A sampling tube (807) is fixedly installed in the inner cavity of the drill rod (705), a rotary joint (808) is rotatably installed on the top of the sampling tube (807), a water pipe (809) is connected between the rotary joint (808) and the second one-way valve (806), a water chamber (810) is opened in the inner cavity of the drill bit (714), and the other end of the sampling tube (807) is inserted into the water chamber (810).

8. The groundwater drilling sampling device according to claim 7, characterized in that: The side wall of the drill bit (714) is provided with a plurality of through holes (811), the plurality of through holes (811) are in communication with the water accumulation chamber (810), the inner cavity of the water accumulation chamber (810) is provided with a permeable membrane (812), the inner cavity of the drill bit (714) is slidably provided with a scraper ring (813), the surface of the scraper ring (813) is symmetrically fixedly provided with a third connecting rod (814), the surface of the drill rod (705) is sleeved with a pressure ring (815), the other end of the third connecting rod (814) is fixedly connected to the pressure ring (815), the surface of the third connecting rod (814) is fixedly provided with a second connecting ring (816), the surface of the third connecting rod (814) is sleeved with a spring (817), one end of the spring (817) is fixedly connected to the second connecting ring (816), and the other end of the spring (817) is fixedly connected to the drill bit (714).

9. The groundwater drilling sampling device according to claim 1, characterized in that: The support frame (1) is provided with a positioning mechanism (9) on the side wall thereof for stabilizing the support frame (1). The positioning mechanism (9) comprises a support (901), a positioning rod (902) and a third gear (906). The support (901) is symmetrically slidably mounted on the side wall of the support frame (1). The positioning rod (902) is fixedly mounted on the lower portion of the support (901). The side wall of the support frame (1) is symmetrically provided with a second limiting groove (903). The side wall of the support (901) is symmetrically fixedly provided with a second clamping block (904). The second clamping block (904) is slidably connected to the second limiting groove (903).

10. The groundwater drilling sampling device according to claim 9, characterized in that: A first tooth plate (905) is fixedly mounted on the side wall of the support (901), a third gear (906) is symmetrically mounted on the inner cavity of the support frame (1), and the third gear (906) is meshedly connected with the first tooth plate (905), and a second tooth plate (907) is fixedly mounted on the side wall of the lifting plate (2), and the second tooth plate (907) is meshedly connected with the third gear (906).

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