Detection instrument for field water quality

Abstract

The invention discloses a detection instrument for field water quality, and belongs to the technical field of water quality detection.The detection instrument for field water quality comprises a detection instrument body and a suitcase, the detection instrument body is arranged in the suitcase, and a plurality of longitudinal reinforcing ribs and a plurality of transverse reinforcing ribs are fixedly arranged on the side wall of the suitcase; a cavity is formed in the bottom of the suitcase, a lifting mechanism used for lifting the suitcase is installed in the cavity, a pull ring is installed on the side wall of one side of the suitcase, a bubble level is further arranged on the side wall of the same side as the pull ring, and hand wheels are arranged between the two longitudinal reinforcing ribs at the two ends of the side of the suitcase respectively. A working cavity is formed in the suitcase, and a driving mechanism used for driving the baffle is arranged in the working cavity. The lifting mechanism is arranged at the bottom of the suitcase, so that the detector body can still keep a horizontal state in a field environment, and the detection quality of outdoor water quality is further ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of water quality detection, and in particular relates to a field water quality detection instrument. Background Art

[0002] Field water quality testing is the process of evaluating the physical, chemical and biological properties of natural water bodies (such as rivers, lakes, reservoirs, etc.). Water quality testing helps to understand the health of water bodies, which is essential for protecting the environment, ensuring drinking water safety and supporting the health of ecosystems. Since there are several items that need to be tested in water quality monitoring, the testing instruments are often equipped with a variety of testing parts. At present, most of the more comprehensive testing instruments look like tool boxes, and the specific testing parts are located inside, which is not only convenient for field testing, but also allows for safer storage of instruments.

[0003] The field environment is different from the laboratory. There is mostly moist soil near the water source. The interior of the water quality testing instrument is divided into multiple testing parts, so it has a certain weight. Whether it is placed directly near the water source or padding is added to the bottom of the testing instrument, it may cause the testing instrument to tilt. If the testing instrument is in an uneven environment, the distribution of the contents in the water sample to be tested poured into the testing instrument will change, thereby affecting the final test results. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of the above-mentioned prior art and provide a field water quality detection instrument.

[0005] The technical solution adopted to solve the above technical problems is:

[0006] A field water quality detection instrument comprises a detector body and a suitcase, wherein the detector body is arranged in the suitcase, and the side walls of the suitcase are fixedly provided with a plurality of longitudinal reinforcing ribs and a plurality of transverse reinforcing ribs, a cavity is provided at the bottom of the suitcase, and a lifting mechanism for lifting the suitcase is arranged in the cavity, a pull ring is provided on one side wall of the suitcase, and a bubble level is also provided on the side wall on the same side as the pull ring, hand wheels are respectively arranged between the two longitudinal reinforcing ribs at both ends of the side of the suitcase, vertical grooves are respectively provided on the two longitudinal reinforcing rib side walls on both sides of the handwheel, baffles are slidably connected in the two vertical grooves, the baffle side walls are abutted against the handwheel side walls, a working chamber is provided inside the suitcase, and a driving mechanism for driving the baffle is arranged in the working chamber.

[0007] Through the above steps, a lifting mechanism with adjustable angle is set at the bottom of the suitcase, so that in the field environment, the suitcase and the detector body inside can remain in a horizontal state, thereby ensuring that when the detector body is detecting, the water sample can be in a horizontal state inside the detector body, and suspended matter and other substances in the water sample will be evenly distributed in the water sample, thereby making the detection effect of the detector body more accurate.

[0008] Furthermore, the bubble level is installed in the middle of the suitcase, and the bubble level is located above the pull ring.

[0009] Through the above steps, the bubble level set in the middle of the suitcase can better represent the overall horizontal state of the suitcase, so the staff can intuitively see whether the suitcase and the detector body inside are in a horizontal state by observing the bubble level.

[0010] Furthermore, the lifting mechanism includes a telescopic rod, a positive and negative screw rod, a top plate, two moving blocks and two support rods, the side wall of the handwheel facing away from the baffle is fixedly connected to the side wall of the telescopic rod, the end of the telescopic rod away from the handwheel passes through the side wall of the cavity and is fixedly connected to the positive and negative screw rods, the positive and negative screw rods are rotatably connected to the side wall of the cavity at one end away from the telescopic rod, the two moving blocks are respectively threadedly connected to the two opposite threaded sections of the positive and negative screw rods, the two support rods are respectively rotatably connected to the bottom of the two moving blocks, two through holes are provided at the bottom of the cavity, the two support rods pass through the two through holes at one end away from the moving blocks, the top plate is located at the bottom of the suitcase, and the top of the top plate is rotatably connected to the two support rods at one end away from the moving blocks.

[0011] Through the above steps, when the staff turns the handwheel, the telescopic rod can drive the forward and reverse screw rods to rotate, and the moving blocks located on the two opposite threaded sections of the forward and reverse screw rods will move toward the middle position of the forward and reverse screw rods or move toward the two ends of the forward and reverse screw rods at the same time. The movement of the moving block will drive the support rod to support the top plate, and then lift one side of the suitcase, making it easier for the staff to balance the suitcase.

[0012] Furthermore, two limiting rods are arranged in the cavity, and two limiting holes are respectively provided on the side walls on both sides of the moving block, and the two limiting rods pass through the two limiting holes respectively.

[0013] Through the above steps, the setting of the limit rod and the limit hole can make the movement of the moving block more stable. The two limit rods are respectively located on both sides of the moving block, so that the forces at both ends of the moving block are consistent, thereby ensuring that the moving block can stably drive the support rod to prop up the top plate.

[0014] Furthermore, the thickness of the top plate is smaller than the thickness of the transverse reinforcing ribs.

[0015] Through the above steps, the setting of the transverse reinforcement ribs can separate the suitcase from the ground, which can prevent the moisture from the ground from directly invading the detector body inside the suitcase, and can also play a certain shockproof role on the suitcase, further ensuring the safety of the detector body. The top plate is thin and can be hidden inside the transverse reinforcement ribs when not in use.

[0016] Furthermore, the driving mechanism includes a stretching rod, an expansion plate, two arc blocks and two rotating rods, the stretching rod is fixedly connected to the side wall of the pull ring, the stretching rod passes through the side wall of the working chamber, the expansion plate is fixedly connected to the side wall of the stretching rod away from the pull ring, the two arc blocks are respectively fixedly arranged on the side walls at both ends of the expansion plate, the arc block is arc-shaped at one end facing the baffle, a groove is provided at the top of the baffle, a top rod is installed in the groove, two through holes are provided on the side wall of the end of the suitcase facing the baffle, a center rod is fixed in the through hole, the center rod is rotatably connected to the center position of the rotating rod, the arc block is located in front of one end in the working chamber opposite to the rotating rod, a movement hole is provided at the other end of the rotating rod, and the top rod is slidably connected to the inner wall of the movement hole.

[0017] Through the above steps, when the staff pulls the pull ring outward, the stretching rod and the unfolding plate can be pulled outward together, so that the two arc blocks drive the rotating rod to rotate, so that the top rod set at the other end of the rotating rod drives the baffle to rise and fall.

[0018] Furthermore, the side walls at both ends of the baffle are respectively fixedly connected with fixing plates, and the sizes of the two fixing plates are larger than the size of the baffle.

[0019] Through the above steps, the setting of the fixed plate prevents the baffle from detaching from the vertical groove, so that the baffle can only be raised and lowered along the vertical groove and will not shake left and right. The baffle stably set in the vertical groove can stably limit the position of the handwheel to ensure that the handwheel will not rotate accidentally during the movement.

[0020] Furthermore, a telescopic spring is wound around the outside of the stretching rod, one end of the telescopic spring is fixedly connected to the side wall of the working chamber, and the other end of the telescopic spring is fixedly connected to the side wall of the unfolding plate.

[0021] Through the above steps, the force applied to the unfolding plate by the telescopic spring will make the unfolding plate have a tendency to move toward the inside of the suitcase, that is, the pull ring will remain in close contact with the side wall of the suitcase, so that the pull ring will not be accidentally pulled out during daily use.

[0022] Furthermore, the side wall of the working chamber is fixedly connected to two positioning rods, the side wall of the unfolding plate is provided with two positioning holes, and the two positioning rods pass through the two positioning holes respectively.

[0023] Through the above steps, the positioning rod and the positioning hole are set so that the expansion plate can move stably when it is brought out together with the pull ring, so that the two arc blocks can stably drive the rotating rod to rotate, and the baffle can stably rise and fall in the vertical groove.

[0024] Through the above technical solution, the beneficial effects of the present invention are as follows:

[0025] (1) The present invention arranges a hand wheel, a telescopic rod, a positive and negative threaded rod, a top plate, a moving block and a supporting rod on the outside of the suitcase. When it is difficult to provide a level ground in the field, the staff can adjust the height of the two top plates at the bottom of the suitcase by turning the hand wheel. By observing the bubble level, it can be ensured that the detector body is in a horizontal state, thereby ensuring that when testing the water quality in the field, the contents in the water will not gather on one side, so that the test result is more accurate;

[0026] (2) The present invention arranges a stretching rod, an unfolding plate, a baffle, an arc block and a rotating rod on the outside of the suitcase. When the suitcase is carried and moved, the baffle will fix the position of the hand wheel, thereby preventing the hand wheel from rotating accidentally and preventing the top plate from rising from the transverse reinforcing ribs, thereby ensuring that the suitcase is more stable during movement and the hand wheel will not be extended or retracted at will. When the position of both sides of the suitcase needs to be adjusted, the pull ring can be pulled to make the unfolding plate drive the arc block to move, and then the rotating rod drives the baffle to move up and down in the vertical slot;

[0027] (3) The present invention provides a limit rod and a limit hole in the cavity, thereby making the movement of the moving block more stable. The two limit rods are respectively located on both sides of the moving block, so that the forces at both ends of the moving block are consistent, thereby ensuring that the moving block can stably drive the support rod to prop up the top plate. At the same time, a positioning rod and a positioning hole are also provided in the working cavity, so that the unfolding plate can move stably when it is brought out together with the pull ring, thereby enabling the two arc blocks to stably drive the rotating rod to rotate, thereby enabling the baffle to stably rise and fall in the vertical groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the structural connection of the lifting mechanism in the present invention;

[0030] Figure 3 It is a schematic diagram of the structural connection between the moving block and the positive and negative threaded rods in the present invention;

[0031] Figure 4 It is a schematic diagram of the structural connection between the moving block, the support rod and the top plate in the present invention;

[0032] Figure 5It is a schematic diagram of the structural connection of the driving mechanism in the present invention;

[0033] Figure 6 It is a schematic diagram of the structural connection between the rotating rod and the top rod in the present invention;

[0034] Figure 7 is a cross-sectional view of the interior of the working chamber in the present invention;

[0035] Figure 8 It is a schematic diagram of the structural connection between the rotating rod and the baffle in the present invention.

[0036] Figure numerals: 1. detector body; 2. suitcase; 3. longitudinal reinforcement rib; 4. transverse reinforcement rib; 5. pull ring; 6. bubble level; 7. hand wheel; 8. vertical slot; 9. baffle; 10. telescopic rod; 11. positive and negative threaded rod; 12. top plate; 13. moving block; 14. support rod; 15. through hole; 16. limit rod; 17. limit hole; 18. stretching rod; 19. unfolding plate; 20. arc block; 21. rotating rod; 22. groove; 23. top rod; 24. through hole; 25. center rod; 26. moving hole; 27. fixed plate; 28. telescopic spring; 29. ​​positioning rod; 30. positioning hole. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] like Figure 1 - Figure 8 As shown, this embodiment provides a field water quality detection instrument, including a detector body 1 and a suitcase 2, the detector body 1 is arranged in the suitcase 2, and a plurality of longitudinal reinforcing ribs 3 and a plurality of transverse reinforcing ribs 4 are fixedly arranged on the side wall of the suitcase 2, the two groups of reinforcing ribs can not only strengthen the structural strength of the suitcase 2, but also raise the height of the suitcase 2, and prevent the moisture on the ground from directly invading the detector body 1 inside the suitcase 2, and the reinforcing ribs can also play a certain shockproof role on the suitcase 2, further ensuring the safety of the detector body 1.

[0039] A cavity is provided at the bottom of the suitcase 2, in which a lifting mechanism for lifting the suitcase 2 is installed, the lifting mechanism comprising a telescopic rod 10, a forward and reverse screw rod 11, a top plate 12, two moving blocks 13 and two supporting rods 14, the side wall of the handwheel 7 facing away from the baffle 9 is fixedly connected to the side wall of the telescopic rod 10, the end of the telescopic rod 10 away from the handwheel 7 passes through the side wall of the cavity and is fixedly connected to the forward and reverse screw rod 11, the forward and reverse screw rod 11 is rotatably connected to the side wall of the cavity away from the end of the telescopic rod 10, the two moving blocks 13 are respectively threadedly connected to the two opposite threaded sections of the forward and reverse screw rod 11, due to the special positions of the two moving blocks 13, when the forward and reverse screw rod 11 rotates, the two moving blocks 13 can be synchronously moved toward the middle position of the forward and reverse screw rod 11, or synchronously moved toward the two end positions of the forward and reverse screw rod 11.

[0040] Two limit rods 16 are installed in the cavity, and two limit holes 17 are respectively opened on the side walls of the moving block 13. The two limit rods 16 pass through the two limit holes 17 respectively. The setting of the limit rods 16 and the limit holes 17 can make the movement of the moving block 13 more stable. The two limit rods 16 are respectively located on both sides of the moving block 13, so that the forces at both ends of the moving block 13 are consistent, thereby ensuring that the moving block 13 can stably drive the support rods 14 to prop up the top plate 12.

[0041] The two support rods 14 are rotatably connected to the bottom of the two moving blocks 13 respectively. Two through holes 15 are opened at the bottom of the cavity. The two support rods 14 pass through the two through holes 15 at one end away from the moving block 13 respectively. The setting of the through holes 15 can limit the position of the support rods 14, thereby ensuring that the moving block 13 drives the support rods 14 to prop up the top plate 12.

[0042] The top plate 12 is located at the bottom of the suitcase 2, and the top of the top plate 12 is rotatably connected to the two support rods 14 at one end away from the moving block 13. The thickness of the top plate 12 is less than the thickness of the transverse reinforcement ribs 4. In daily use, the top plate 12 will shrink between the transverse reinforcement ribs 4, which will not affect the protective effect of the transverse reinforcement ribs 4 on the suitcase 2, and will not affect the support of the transverse reinforcement ribs 4 on the suitcase 2. The suitcase 2 can still be in a horizontal state.

[0043] A pull ring 5 is installed on the side wall of one side of the suitcase 2, and a bubble level 6 is also installed on the side wall on the same side as the pull ring 5. The bubble level 6 is installed in the middle position of the suitcase 2, and the bubble level 6 is located above the pull ring 5. When the staff needs to test the water quality, the bubble level 6 can help the staff to level the suitcase 2 body and the detector body 1. The bubble level 6 set in the middle position of the suitcase 2 can better represent the overall horizontal state of the suitcase 2. Therefore, the staff can intuitively see whether the suitcase 2 and the detector body 1 inside are in a horizontal state by observing the bubble level 6.

[0044] A handwheel 7 is respectively arranged between the two longitudinal reinforcing ribs 3 at the two ends of this side of the suitcase 2, and a vertical groove 8 is respectively opened on the side walls of the two longitudinal reinforcing ribs 3 on both sides of the handwheel 7, and baffles 9 are slidably connected in the two vertical grooves 8. The side walls of the baffles 9 are abutted against the side walls of the handwheel 7, and the side walls of the baffles 9 at both ends of the baffles 9 are respectively fixedly connected with fixing plates 27. The sizes of the two fixing plates 27 are larger than those of the baffles 9. The setting of the fixing plates 27 prevents the baffles 9 from detaching from the vertical grooves 8, so that the baffles 9 can only be lifted and lowered along the vertical grooves 8 and will not shake left and right. The baffles 9 stably arranged in the vertical grooves 8 will be in close contact with the side walls of the handwheel 7, and the friction force will have a limiting effect on the handwheel 7, which can stably limit the position of the handwheel 7 to ensure that the handwheel 7 will not rotate accidentally during the movement.

[0045] A working chamber is provided inside the suitcase 2, in which a driving mechanism for driving the baffle 9 is installed, the driving mechanism comprising a stretching rod 18, an unfolding plate 19, two arc-shaped blocks 20 and two rotating rods 21, the stretching rod 18 is fixedly connected to the side wall of the pull ring 5, the stretching rod 18 passes through the side wall of the working chamber, the unfolding plate 19 is fixedly connected to the side wall of the stretching rod 18 away from the pull ring 5, a telescopic spring 28 is wound around the outside of the stretching rod 18, one end of the telescopic spring 28 is fixedly connected to the side wall of the working chamber, and the other end is fixedly connected to the side wall of the unfolding plate 19, the force applied by the telescopic spring 28 to the unfolding plate 19 will make the unfolding plate 19 have a tendency to move toward the inside of the suitcase 2, that is, the pull ring 5 will remain in close contact with the side wall of the suitcase 2, so that the pull ring 5 will not be accidentally pulled out during daily use, thereby ensuring stability when it is not needed.

[0046] The two arc blocks 20 are respectively fixed on the side walls at both ends of the unfolding plate 19. The end of the arc block 20 facing the baffle 9 is designed to be arc-shaped. Therefore, when the staff pulls out the pull ring 5, the unfolding plate 19 will drive the arc block 20 to move toward the rotating rod 21, so that the rotating rod can rotate around the center rod 25, thereby driving the baffle 9 to rise and fall along the vertical groove 8.

[0047] A groove 22 is provided at the top of the baffle 9, and a top rod 23 is installed in the groove 22. Two through holes 24 are provided on the side wall of the suitcase 2 facing the baffle 9. A center rod 25 is fixed in the through hole 24. The center rod 25 is rotatably connected to the center position of the rotating rod 21. The arc block 20 is located in front of one end of the working chamber opposite to the rotating rod 21. A moving hole 26 is provided at the other end of the rotating rod 21. The top rod 23 is slidably connected to the inner wall of the moving hole 26. The length of the moving hole 26 allows the top rod 23 to slide in the moving hole 26 while also driving the baffle 9 to rise in height.

[0048] Two positioning rods 29 are fixedly connected to the side wall of the working chamber, and two positioning holes 30 are provided on the side wall of the unfolding plate 19. The two positioning rods 29 pass through the two positioning holes 30 respectively. The arrangement of the positioning rods 29 and the positioning holes 30 enables the unfolding plate 19 to move stably when being brought out together with the pull ring 5, so that the two arc blocks 20 can stably drive the rotating rod 21 to rotate, so that the baffle 9 can stably rise and fall in the vertical groove 8.

[0049] The working principle of this embodiment is as follows: when the staff carries the suitcase 2 to move, the baffle 9 is located in front of the handwheel 7, which restricts the handwheel 7. At this time, the handwheel 7 cannot be rotated at will. When the staff needs to test the water quality, the suitcase 2 is placed on a flat ground, the bubble level 6 is observed, and then the pull ring 5 is pulled out. The stretching rod 18 fixedly connected to the side wall of the pull ring 5 will be driven by the pull ring 5 to move outward, and while compressing the telescopic spring 28, it will also drive the expansion plate 19 to move outward, so that the arc block 20 presses the rotating rod 21, so that the rotating rod 21 rotates around the center rod 25, and the other end of the rotating rod 21 will be lifted, so that the top rod 23 slides in the movement hole 26. The lifting of the top rod 23 will also drive the baffle 9 to move upward, so that the baffle 9 leaves the handwheel 7, which is convenient for the staff to rotate the handwheel 7;

[0050] Then the staff can pull out the handwheel 7, and the handwheel 7 is pulled outward under the drive of the telescopic rod 10. When the staff turns the handwheel 7, the forward and reverse screw rods 11 will rotate accordingly under the drive of the telescopic rod 10, so that the two moving blocks 13 move toward the center position at the same time, and the support rod 14 installed at the bottom of the moving block 13 will drive the top plate 12 to move, thereby lifting the bottom of the suitcase 2. The staff can adjust the detector body 1 to a horizontal position by observing the bubble level 6 and adjusting the handwheel 7, thereby improving the detection quality.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention.

Claims

1. A field water quality detection instrument, comprising a detector body (1) and a suitcase (2), wherein the detector body (1) is arranged in the suitcase (2), and characterized in that: The side wall of the suitcase (2) is fixedly provided with a plurality of longitudinal reinforcing ribs (3) and a plurality of transverse reinforcing ribs (4); a cavity is provided at the bottom of the suitcase (2); a lifting mechanism for lifting the suitcase (2) is arranged in the cavity; a pull ring (5) is provided on one side wall of the suitcase (2); a bubble level (6) is also provided on the side wall on the same side as the pull ring (5); a hand wheel (7) is provided between the two longitudinal reinforcing ribs (3) at both ends of the side of the suitcase (2); vertical grooves (8) are provided on the side walls of the two longitudinal reinforcing ribs (3) on both sides of the hand wheel (7); baffles (9) are slidably connected in the two vertical grooves (8); the side walls of the baffles (9) are abutted against the side walls of the hand wheel (7); a working cavity is provided inside the suitcase (2); a driving mechanism for driving the baffles (9) is arranged in the working cavity.

2. The field water quality detection instrument according to claim 1, characterized in that: The bubble level (6) is installed in the middle of the suitcase (2), and the bubble level (6) is located above the pull ring (5).

3. The field water quality detection instrument according to claim 1, characterized in that: The lifting mechanism comprises a telescopic rod (10), a positive and negative threaded rod (11), a top plate (12), two moving blocks (13) and two supporting rods (14); the side wall of the hand wheel (7) facing away from the baffle (9) is fixedly connected to the side wall of the telescopic rod (10); the end of the telescopic rod (10) away from the hand wheel (7) passes through the side wall of the cavity and is fixedly connected to the positive and negative threaded rod (11); the end of the positive and negative threaded rod (11) away from the telescopic rod (10) is rotatably connected to the side wall of the cavity; the two moving blocks (13) are connected to the side wall of the cavity. The two support rods (14) are respectively connected to the two opposite threaded sections of the forward and reverse threaded rods (11), the two support rods (14) are respectively connected to the bottom of the two moving blocks (13) for rotation, the bottom of the cavity is provided with two through holes (15), the ends of the two support rods (14) away from the moving blocks (13) respectively pass through the two through holes (15), the top plate (12) is located at the bottom of the suitcase (2), and the top of the top plate (12) is respectively connected to the ends of the two support rods (14) away from the moving blocks (13) for rotation.

4. The field water quality detection instrument according to claim 3, characterized in that: Two limiting rods (16) are arranged in the cavity, and two limiting holes (17) are respectively provided on the side walls of both sides of the moving block (13), and the two limiting rods (16) respectively pass through the two limiting holes (17).

5. The field water quality detection instrument according to claim 3, characterized in that: The thickness of the top plate (12) is smaller than the thickness of the transverse reinforcing ribs (4).

6. The field water quality detection instrument according to claim 1, characterized in that: The driving mechanism comprises a stretching rod (18), an expansion plate (19), two arc blocks (20) and two rotating rods (21); the stretching rod (18) is fixedly connected to the side wall of the pull ring (5); the stretching rod (18) passes through the side wall of the working chamber; the expansion plate (19) is fixedly connected to the side wall of the stretching rod (18) at one end away from the pull ring (5); the two arc blocks (20) are respectively fixedly arranged on the side walls at both ends of the expansion plate (19); the end of the arc block (20) facing the baffle (9) is of arc design; the top of the baffle (9) is provided with a A groove (22) is provided, a top rod (23) is arranged in the groove (22), two through holes (24) are provided on the side wall of one end of the suitcase (2) facing the baffle (9), a center rod (25) is fixedly arranged in the through hole (24), the center rod (25) is rotatably connected to the center position of the rotating rod (21), the arc block (20) is located in front of one end in the working chamber facing the rotating rod (21), a movement hole (26) is provided at the other end of the rotating rod (21), and the top rod (23) is slidably connected to the inner wall of the movement hole (26).

7. The field water quality detection instrument according to claim 1, characterized in that: The side walls at both ends of the baffle (9) are respectively fixedly connected with fixing plates (27), and the sizes of the two fixing plates (27) are both larger than the sizes of the baffle (9).

8. The field water quality detection instrument according to claim 6, characterized in that: A telescopic spring (28) is wound around the outside of the stretching rod (18), one end of the telescopic spring (28) is fixedly connected to the side wall of the working chamber, and the other end is fixedly connected to the side wall of the unfolding plate (19).

9. The field water quality detection instrument according to claim 6, characterized in that: Two positioning rods (29) are fixedly connected to the side wall of the working chamber, and two positioning holes (30) are opened on the side wall of the unfolding plate (19), and the two positioning rods (29) pass through the two positioning holes (30) respectively.

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