A sampling device for lake water quality testing used in water conservancy projects

Abstract

The present invention discloses a sampling device for lake water quality detection used in water conservancy projects, which relates to the field of sampling technology. The device comprises an elastic telescopic column, a round shield, a square ring, an inclined block, a rotating plate, a push rod and a connecting plate. The fixed end of the elastic telescopic column is fixedly mounted on the bottom of a collection tank, the round shield is fixedly mounted on the free end of the elastic telescopic column, one end of the connecting plate is fixedly mounted on the inner arc surface of the round shield, the square ring is fixedly mounted on the other end of the connecting plate, the rotating plate is rotatably mounted on the outer wall of the collection tank, the inclined block is fixedly mounted on a side of the rotating plate close to the collection tank, and one end of the push rod is rotatably mounted on the outer wall of the collection tank to avoid damage to the bottom of the collection tank. A two-stage spring drive is adopted to avoid structural damage caused by excessive instantaneous impact force. Through two telescopic actions, the anchoring requirements of different bottoms can be met.

Description

Technical Field

[0001] The invention relates to the technical field of sampling, in particular to a sampling device for detecting lake water quality used in water conservancy projects. Background Art

[0002] The sampling device for lake water quality testing is a device used for water quality testing, which is designed to collect and test the liquid at the bottom of the lake.

[0003] The patent with patent announcement number CN219675581U involves: a support frame; a fixed plate, which is fixedly installed on the support frame; a mounting plate, which is arranged on one side of the support frame; multiple sampling mechanisms, which are arranged on the mounting plate; a traction mechanism, which is arranged on the fixed plate and the mounting plate. The sampling device for water quality testing provided by this patent has the advantages of better meeting the sampling operations of water sources at different depths, being more flexible to use, and saving time and effort.

[0004] In the above patent, the sampling device for water quality testing provided by the patent has the advantages of being able to better meet the sampling operations of water sources at different depths, being more flexible to use, and saving time and effort. However, there are still problems. It is impossible to effectively collect and test the bottom of the lake, it is impossible to effectively seal the collection device, and it is impossible to ensure that the collected liquid is not affected by other conditions. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a sampling device for detecting lake water quality in water conservancy projects, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a sampling device for lake water quality testing used in water conservancy projects, comprising a wire take-up device, the wire take-up device being fixedly connected to a collection tank via a cable, a rotating shaft being provided inside the wire take-up device, a water pump being provided on the top of the collection tank, and an anti-tilt mechanism being provided on the bottom of the collection tank;

[0007] The anti-tilt mechanism includes an elastic telescopic column, a round shield, a square ring, an inclined block, a rotating plate, a push rod and a connecting plate. The fixed end of the elastic telescopic column is fixedly mounted on the bottom of the collection tank, the round shield is fixedly mounted on the free end of the elastic telescopic column, one end of the connecting plate is fixedly mounted on the inner arc surface of the round shield, the square ring is fixedly mounted on the other end of the connecting plate, the rotating plate is rotatably mounted on the outer wall of the collection tank, the inclined block is fixedly mounted on a side of the rotating plate close to the collection tank, and one end of the push rod is rotatably mounted on the outer wall of the collection tank.

[0008] Among them, the interior of the collection tank is provided with an isolation mechanism to prevent the liquid inside from becoming turbid and affecting the detection results when the collection tank is pulled upward, and a prevention mechanism to avoid accidents when the line is reeled in. When reaching the bottom, the round shield will contact the bottom. When the round shield contacts the bottom, the elastic telescopic column will be compressed. When the round shield moves, it will drive the connecting plate to move. When the connecting plate moves, it will drive the square ring to slide on the surface of the collection tank.

[0009] According to the above technical solution, the anti-tilt mechanism also includes a limit block, a plug plate, a power-assisting block, a force block and a limit rod, the limit block is slidably mounted on the side of the rotating plate away from the collection tank, the limit rod is fixedly mounted on the top of the limit block, the force block is fixedly mounted on the side of the rotating plate away from the collection tank, the power-assisting block is slidably mounted on the side of the rotating plate close to the force block, the plug plate is slidably mounted on the side of the rotating plate close to the force block, the triangular block is rotatably mounted on the other end of the push rod, and the triangular block is slidably mounted on the side of the rotating plate away from the collection tank. When the limit block moves to a certain position, the limit on the plug plate will be released. When the limit of the plug plate is released, the plug plate will move outward due to the spring action between it and the power-assisting block, thereby causing the plug plate to be inserted into the soil.

[0010] According to the above technical solution, a No. 1 spring is provided between the boosting block and the force-bearing block, a No. 2 spring is provided between the boosting block and the plug plate, the triangular block is in contact with the limit block, and the boosting block is in contact with the limit rod. The force-bearing block will push the boosting block to move, and when the boosting block moves, it will push the plug plate to move again, so that the plug plate continues to extend and retract outward for a certain distance, thereby achieving a more stable insertion.

[0011] According to the above technical solution, the isolation mechanism includes a triangular block, a push plate, a rounded column, a trapezoidal block and a spacer. The push plate is fixedly installed on the top of the square ring, the rounded column is fixedly installed on the side of the push plate close to the collection tank, the spacer is fixedly installed inside the collection tank, and the trapezoidal block is slidably installed on the bottom of the spacer. Two through holes are provided in the middle of the spacer. At the same time, when the trapezoidal block moves, it will drive the connecting plate to move, and when the connecting plate moves, it will drive the bottom plate to move. When the bottom plate moves, it will contact with the semi-cylinder, and vibration will be generated during contact.

[0012] According to the above technical solution, the isolation mechanism also includes a connecting plate, a bottom plate and a semi-cylinder. One end of the connecting plate is fixedly installed on the bottom of the trapezoidal block, the bottom plate is fixedly installed on the other end of the connecting plate, and the semi-cylinder is fixedly installed on the bottom of the inner wall of the collection tank. When the connecting plate moves, it will drive the bottom plate to move. When the bottom plate moves, it will contact the semi-cylinder, and vibration will be generated during the contact, thereby shaking the bottom of the collection tank to prevent clogging by mud and sand.

[0013] According to the above technical solution, the rounded column contacts the trapezoidal block, and the bottom plate contacts the semi-cylinder, thereby releasing the limit of the trapezoidal block. When the limit of the trapezoidal block is released, the holes of the partition plate will be blocked to prevent the soil at the bottom of the collection tank from being stirred when it moves, affecting the liquid detection value.

[0014] According to the above technical solution, the preventive mechanism includes a disc, an elastic telescopic plate, a ring plate, a limiting column, a movable rod, a triangle plate, a one-way block and a blocking block. The disc is fixedly mounted on the circumferential surface of the rotating shaft, the elastic telescopic plate is fixedly mounted inside the disc, the ring plate is rotatably mounted on the front side of the wire-winding device, the limiting column is fixedly mounted on the front side of the wire-winding device, the movable rod is fixedly mounted on the circumferential surface of the ring plate, the triangle plate is fixedly mounted on the circumferential surface of the rotating shaft, the one-way block is slid left and right on the back side of the wire-winding device, and the blocking block is slid up and down on the back side of the wire-winding device. It is necessary to push the one-way block in the direction of the triangle plate and pull the blocking block downward, so that the triangle plate will not be affected when rotating counterclockwise, but will be stuck when rotating clockwise, to avoid the staff from accidentally operating in the opposite direction.

[0015] According to the above technical solution, the elastic telescopic plate is in contact with the ring plate, the limiting column is in contact with the moving rod, the triangular plate is in contact with the one-way block, and the one-way block is in contact with the blocking block. When the ring plate rotates, it will drive the moving rod to rotate. When the moving rod rotates, it will move a certain distance for buffering. When the moving rod contacts the limiting column, the ring plate will be limited and stuck, thereby preventing the take-up device from continuing to rotate.

[0016] The present invention provides a sampling device for lake water quality testing used in water conservancy projects. It has the following beneficial effects:

[0017] (1) This invention, when reaching the bottom, the round shield will contact the bottom. When the round shield contacts the bottom, the elastic telescopic column will be compressed. When the assist block moves, it will push the plug plate to move again, so that the plug plate will continue to extend outward for a distance, achieving a more stable insertion and avoiding damage to the bottom of the collection tank. It adopts a two-stage spring drive to avoid structural damage caused by excessive instantaneous impact force. Through two telescopic actions, it can meet the anchoring requirements of different bottoms.

[0018] (2) In this invention, when the bottom plate moves, it will contact the semi-cylinder, and vibration will be generated during the contact, thereby shaking the bottom of the collection tank to prevent mud and sand from clogging. When the limit of the trapezoidal block is released, the holes of the partition plate will be blocked to prevent the mud at the bottom of the collection tank from being stirred when the collection tank moves, affecting the liquid detection value, and preventing the bottom mud particles from being re-suspended due to turbulence, ensuring that the deviation rate of the test results is <0.5%. In addition, by precisely controlling the opening and closing of the fluid channel, it is achieved that the sampling is not affected by the movement of the sampler, further ensuring the authenticity and accuracy of the collected samples.

[0019] (3) This invention requires pushing the one-way block toward the direction of the triangle plate and pulling the blocking block downward, so that the triangle plate will not be affected when it rotates counterclockwise, but will be stuck when it rotates clockwise, to prevent the staff from mistakenly operating it in the opposite direction. When the moving rod contacts the limit column, the ring plate limit will be stuck, thereby preventing the take-up device from continuing to rotate, preventing the staff from accidentally causing the take-up device to release the line quickly, causing damage to the collection tank, and the buffer structure can prevent the machine from breaking inside. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0021] Figure 2 This is a schematic diagram of the square ring and oblique block structure of the present invention;

[0022] Figure 3 For the present invention Figure 2 A schematic diagram of the structure of part A in the middle;

[0023] Figure 4 This is a schematic diagram of the bottom plate and semi-cylinder structure of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the trapezoidal block and the spacer plate of the present invention;

[0025] Figure 6 This is a schematic diagram of the elastic expansion plate and the ring plate structure of the present invention;

[0026] Figure 7 It is a schematic diagram of the structure of the set plate and the one-way block of the present invention.

[0027] In the figure: 1. wire-reeling device; 2. collection tank; 3. water pump; 401. elastic telescopic column; 402. round shield; 403. square ring; 404. oblique block; 405. rotating plate; 406. push rod; 407. triangular block; 408. limiting block; 409. plug-in plate; 410. power block; 411. force block; 412. limiting rod; 413. connecting plate; 501. push plate; 502. rounded column; 503. trapezoidal block; 504. spacer plate; 505. connecting plate; 506. bottom plate; 507. semi-cylinder; 601. disc; 602. elastic telescopic plate; 603. ring plate; 604. limiting column; 605. moving rod; 606. triangular plate; 607. one-way block; 608. blocking block. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] See also Figure 1-Figure 7 One embodiment of the present invention is: a sampling device for lake water quality testing used in water conservancy projects, comprising a take-up device 1, the take-up device 1 being fixedly connected to a collection tank 2 by a cable, a rotating shaft being provided inside the take-up device 1, a water pump 3 being provided on the top of the collection tank 2, and an anti-tilt mechanism being provided on the bottom of the collection tank 2;

[0030] Among them, the anti-tilt mechanism includes an elastic telescopic column 401, a round shield 402, a square ring 403, an inclined block 404, a rotating plate 405, a push rod 406 and a connecting plate 413. The fixed end of the elastic telescopic column 401 is fixedly installed at the bottom of the collection tank 2, the round shield 402 is fixedly installed at the free end of the elastic telescopic column 401, one end of the connecting plate 413 is fixedly installed on the inner arc surface of the round shield 402, the square ring 403 is fixedly installed at the other end of the connecting plate 413, the rotating plate 405 is rotatably installed on the outer wall of the collection tank 2, the inclined block 404 is fixedly installed on the side of the rotating plate 405 close to the collection tank 2, and one end of the push rod 406 is rotatably installed on the outer wall of the collection tank 2 to prevent the bottom of the collection tank 2 from being damaged. It adopts a two-stage spring drive to avoid structural damage caused by excessive instantaneous impact force. Through two telescopic actions, it can meet the anchoring requirements of different bottoms.

[0031] The anti-tilt mechanism also includes a triangular block 407, a limit block 408, a plug plate 409, a power block 410, a force block 411 and a limit rod 412. The limit block 408 is slidably mounted on the side of the rotating plate 405 away from the collection tank 2, the limit rod 412 is fixedly mounted on the top of the limit block 408, the force block 411 is fixedly mounted on the side of the rotating plate 405 away from the collection tank 2, the power block 410 is slidably mounted on the side of the rotating plate 405 close to the force block 411, and the plug plate 409 is slidably mounted on the side of the rotating plate 405 close to the force block 411. The triangular block 407 is rotatably mounted on the other end of the push rod 406, and the triangular block 407 is slidably mounted on the side of the rotating plate 405 away from the collection tank 2. When the limit block 408 moves to a certain position, the limit on the plug plate 409 will be released. When the limit of the plug plate 409 is released, the plug plate 409 will move outward due to the spring action between it and the power block 410, thereby causing the plug plate 409 to be inserted into the soil.

[0032] A No. 1 spring is provided between the assisting block 410 and the force block 411, a No. 2 spring is provided between the assisting block 410 and the inserting plate 409, the triangular block 407 is in contact with the limit block 408, the assisting block 410 is in contact with the limit rod 412, the force block 411 will push the assisting block 410 to move, and when the assisting block 410 moves, it will push the inserting plate 409 to move again, so that the inserting plate 409 continues to extend and retract outward for a certain distance, thereby achieving a more stable insertion.

[0033] When this embodiment is working: after the take-up device 1 is connected to the collection tank 2 by a cable, the water pump 3 is started. When the collection tank 2 is placed in the water, it will drop vertically downward. When it reaches the bottom, the round shield 402 will contact the bottom. When the round shield 402 contacts the bottom, the elastic telescopic column 401 will be compressed. When the round shield 402 moves, it will drive the connecting plate 413 to move. When the connecting plate 413 moves, it will drive the square ring 403 to slide on the surface of the collection tank 2. When the square ring 403 slides, it will contact the inclined block 404. When the square ring 403 contacts the inclined block 404, the inclined block 404 will rotate outward. When the inclined block 404 rotates outward, it will drive the rotating plate 405 to rotate. When the rotating plate 405 rotates outward, the push rod 406 above will slide on the rotating plate 405. When the push rod 406 slides, it will push the triangular block When the limit block 407 moves, it will push the limit block 408 to move. When the limit block 408 moves to a certain position, the limit on the plug plate 409 will be released. When the limit of the plug plate 409 is released, the plug plate 409 will move outward due to the spring action between it and the assisting block 410, so that the plug plate 409 is inserted into the soil, allowing the collection tank 2 to collect samples more stably. However, when the limit block 408 continues to move, it will drive the limit rod 412 to move. When the limit rod 412 continues to move, the limit on the assisting block 410 will be released. When the limit of the assisting block 410 is released, the force block 411 will push the assisting block 410 to move. When the assisting block 410 moves, it will push the plug plate 409 to move again, so that the plug plate 409 continues to extend and retract outward for a distance, thereby achieving a more stable insertion.

[0034] See also Figure 1-Figure 7 On the basis of the above embodiment, in another embodiment of the present invention, the interior of the collection tank 2 is provided with an isolation mechanism to prevent the liquid inside from becoming turbid and affecting the detection results when the collection tank 2 is pulled upward, and a preventive mechanism to avoid accidents when the line is reeled in. The isolation mechanism includes a push plate 501, a rounded column 502, a trapezoidal block 503 and a spacer 504. The push plate 501 is fixedly mounted on the top of the square ring 403, the rounded column 502 is fixedly mounted on the side of the push plate 501 close to the collection tank 2, the spacer 504 is fixedly mounted inside the collection tank 2, the trapezoidal block 503 is slidably mounted on the bottom of the spacer 504, and two through holes are provided in the middle of the spacer 504 to avoid clogging with mud and sand and to prevent the bottom mud particles from being re-suspension due to turbulence, thereby ensuring that the deviation rate of the detection result is extremely low, and the opening and closing of the fluid channel are precisely controlled.

[0035] The isolation mechanism also includes a connecting plate 505, a bottom plate 506 and a semi-cylinder 507. One end of the connecting plate 505 is fixedly mounted on the bottom of the trapezoidal block 503, the bottom plate 506 is fixedly mounted on the other end of the connecting plate 505, and the semi-cylinder 507 is fixedly mounted on the bottom of the inner wall of the collection tank 2. When the connecting plate 505 moves, it will drive the bottom plate 506 to move. When the bottom plate 506 moves, it will contact the semi-cylinder 507, and vibration will be generated during the contact, thereby shaking the bottom of the collection tank 2 to prevent clogging by mud and sand.

[0036] The rounded column 502 contacts the trapezoidal block 503, and the bottom plate 506 contacts the semi-cylinder 507, thereby releasing the limit of the trapezoidal block 503. When the limit of the trapezoidal block 503 is released, the hole of the partition plate 504 will be blocked to prevent the soil at the bottom of the collection tank 2 from being stirred when it moves, affecting the liquid detection value.

[0037] The prevention mechanism includes a disc 601, an elastic telescopic plate 602, a ring plate 603, a limiting column 604, a moving rod 605, a triangular plate 606, a one-way block 607 and a blocking block 608. The disc 601 is fixedly mounted on the circumferential surface of the rotating shaft, the elastic telescopic plate 602 is fixedly mounted inside the disc 601, the ring plate 603 is rotatably mounted on the front of the wire-taking device 1, the limiting column 604 is fixedly mounted on the front of the wire-taking device 1, the moving rod 605 is fixedly mounted on the circumferential surface of the ring plate 603, the triangular plate 606 is fixedly mounted on the circumferential surface of the rotating shaft, the one-way block 607 is slidably mounted on the back of the wire-taking device 1 left and right, and the blocking block 608 is slidably mounted on the back of the wire-taking device 1 up and down, thereby preventing the wire-taking device 1 from continuing to rotate, preventing the staff from accidentally causing the wire-taking device 1 to quickly release the wire, causing damage to the collection tank 2, and the buffer structure can be used to prevent breakage inside the machine.

[0038] The elastic telescopic plate 602 contacts the ring plate 603, the limiting column 604 contacts the moving rod 605, the triangular plate 606 contacts the one-way block 607, and the one-way block 607 contacts the blocking block 608. When the ring plate 603 rotates, it will drive the moving rod 605 to rotate. When the moving rod 605 rotates, it will move a distance for buffering. When the moving rod 605 contacts the limiting column 604, the ring plate 603 will be limited and stuck, thereby preventing the take-up device 1 from continuing to rotate.

[0039] When this embodiment works: when the square ring 403 moves, it will drive the push plate 501 to move, and when the push plate 501 moves, it will drive the rounded column 502 to move, and when the rounded column 502 moves, it will push the trapezoidal block 503 to move, and when the trapezoidal block 503 moves, it will remove the blockage of the through hole of the partition plate 504. When the through hole of the partition plate 504 is removed, the liquid at the bottom will be poured into the top of the partition plate 504. At the same time, when the trapezoidal block 503 moves, it will drive the connecting plate 505 to move, and the connecting plate 505 will drive The bottom plate 506 moves, and when the bottom plate 506 moves, it will contact the semi-cylinder 507, which will generate vibration, thereby shaking the bottom of the collection tank 2 to prevent mud and sand from clogging. When the collection tank 2 is to be pulled up, the square ring 403 will move downward. When the square ring 403 moves up and down, it will drive the push plate 501 to move downward, thereby releasing the limit of the trapezoidal block 503. When the limit of the trapezoidal block 503 is released, the hole of the partition plate 504 will be blocked, preventing the soil at the bottom of the collection tank 2 from being stirred when the collection tank 2 moves, affecting the liquid detection value.

[0040] When the staff is ready to pull the collection tank 2 upward, it is necessary to push the one-way block 607 in the direction of the triangular plate 606 and pull the blocking block 608 downward. This will prevent the triangular plate 606 from rotating counterclockwise, but it will be stuck when rotating clockwise, preventing the staff from accidentally operating in the opposite direction. Since the collection tank 2 is full of liquid, when the staff lacks strength and causes the line-reeling device 1 to lose control, the disc 601 will rotate rapidly. When the disc 601 rotates rapidly, the elastic telescopic plate 602 will be thrown outward. When the elastic telescopic plate 602 is thrown outward, it will contact the ring plate 603, thereby driving the ring plate 603 to rotate. When the ring plate 603 rotates, it will drive the moving rod 605 to rotate. When the moving rod 605 rotates, it will move a distance for buffering. When the moving rod 605 contacts the limiting column 604, the ring plate 603 will be limited and stuck, thereby preventing the line-reeling device 1 from continuing to rotate.

[0041] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A sampling device for detecting lake water quality in a water conservancy project, comprising a line-receiving device (1), characterized in that: The wire-taking device (1) is fixedly connected to the collection tank (2) via a cable, a rotating shaft is provided inside the wire-taking device (1), a water pump (3) is provided on the top of the collection tank (2), and an anti-tilting mechanism is provided on the bottom of the collection tank (2); The anti-tilt mechanism comprises an elastic telescopic column (401), a round shield (402), a square ring (403), an inclined block (404), a rotating plate (405), a push rod (406) and a connecting plate (413); the fixed end of the elastic telescopic column (401) is fixedly mounted on the bottom of the collection tank (2); the round shield (402) is fixedly mounted on the free end of the elastic telescopic column (401); one end of the connecting plate (413) is fixedly mounted on the inner arc surface of the round shield (402); the square ring (403) is fixedly mounted on the other end of the connecting plate (413); the rotating plate (405) is rotatably mounted on the outer wall of the collection tank (2); the inclined block (404) is fixedly mounted on a side of the rotating plate (405) close to the collection tank (2); and one end of the push rod (406) is rotatably mounted on the outer wall of the collection tank (2); The interior of the collection tank (2) is provided with an isolation mechanism to prevent the liquid inside from becoming turbid when the collection tank (2) is pulled upwards, thereby affecting the detection results, and a prevention mechanism to avoid accidents when the line is reeled in; The anti-tilt mechanism further comprises a triangular block (407), a limiting block (408), an inserting plate (409), a power-assisting block (410), a force-bearing block (411) and a limiting rod (412), wherein the limiting block (408) is slidably mounted on a side of the rotating plate (405) away from the collection tank (2), the limiting rod (412) is fixedly mounted on the top of the limiting block (408), the force-bearing block (411) is fixedly mounted on a side of the rotating plate (405) away from the collection tank (2), the power-assisting block (410) is slidably mounted on a side of the rotating plate (405) close to the force-bearing block (411), the inserting plate (409) is slidably mounted on a side of the rotating plate (405) close to the force-bearing block (411), the triangular block (407) is rotatably mounted on the other end of the push rod (406), and the triangular block (407) is slidably mounted on a side of the rotating plate (405) away from the collection tank (2); The isolation mechanism comprises a push plate (501), a rounded column (502), a trapezoidal block (503) and a spacer plate (504), wherein the push plate (501) is fixedly mounted on the top of the square ring (403), the rounded column (502) is fixedly mounted on a side of the push plate (501) close to the collection tank (2), the spacer plate (504) is fixedly mounted inside the collection tank (2), the trapezoidal block (503) is slidably mounted on the bottom of the spacer plate (504), and two through holes are provided in the middle of the spacer plate (504).

2. The sampling device for detecting lake water quality for water conservancy projects according to claim 1, characterized in that: A No. 1 spring is provided between the boosting block (410) and the force-bearing block (411), a No. 2 spring is provided between the boosting block (410) and the inserting plate (409), the triangular block (407) contacts the limiting block (408), and the boosting block (410) contacts the limiting rod (412).

3. The sampling device for detecting lake water quality for water conservancy projects according to claim 1, characterized in that: The isolation mechanism further comprises a connecting plate (505), a bottom plate (506) and a semi-cylinder (507), one end of the connecting plate (505) being fixedly mounted on the bottom of the trapezoidal block (503), the bottom plate (506) being fixedly mounted on the other end of the connecting plate (505), and the semi-cylinder (507) being fixedly mounted on the bottom of the inner wall of the collection tank (2).

4. The sampling device for detecting lake water quality in a hydraulic engineering project according to claim 3, characterized in that: The rounded column (502) contacts the trapezoidal block (503), and the bottom plate (506) contacts the semi-circular column (507).

5. The sampling device for detecting lake water quality in a hydraulic engineering project according to claim 4, characterized in that: The prevention mechanism comprises a disc (601), an elastic telescopic plate (602), an annular plate (603), a limiting column (604), a moving rod (605), a triangular plate (606), a one-way block (607) and a blocking block (608), wherein the disc (601) is fixedly mounted on the circumferential surface of the rotating shaft, the elastic telescopic plate (602) is fixedly mounted inside the disc (601), the annular plate (603) is rotatably mounted on the front face of the wire-receiving device (1), the limiting column (604) is fixedly mounted on the front face of the wire-receiving device (1), the moving rod (605) is fixedly mounted on the circumferential surface of the annular plate (603), the triangular plate (606) is fixedly mounted on the circumferential surface of the rotating shaft, the one-way block (607) is slidably mounted on the back face of the wire-receiving device (1) left and right, and the blocking block (608) is slidably mounted on the back face of the wire-receiving device (1) up and down.

6. The sampling device for detecting lake water quality for water conservancy projects according to claim 5, characterized in that: The elastic expansion plate (602) contacts the ring plate (603), the limiting column (604) contacts the moving rod (605), the triangular plate (606) contacts the one-way block (607), and the one-way block (607) contacts the blocking block (608).

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