River water quality detection device

Abstract

The invention belongs to the technical field of water quality detection, and particularly discloses a river water quality detection device which comprises a ship body, a supporting plate is fixedly arranged on the upper side of the front end of the ship body, a spiral hose is fixedly arranged on the lower side of the middle of the supporting plate, a collecting barrel is arranged below the spiral hose, and the upper wall of the collecting barrel is fixedly communicated with the lower end of the spiral hose. A lifting rope is fixedly connected to the center of the upper wall of the collecting cylinder, a winding lifting mechanism and a pollution-free negative pressure driving mechanism are arranged in the ship body, the lifting rope upwards penetrates through the center of the spiral hose and the supporting plate and then is connected with the winding lifting mechanism, and the upper end of the spiral hose penetrates through the supporting plate and then is communicated with the pollution-free negative pressure driving mechanism; and the lower end of the collecting cylinder is provided with a diving collecting off-water emptying mechanism. According to the invention, when sampling is carried out at different depths, a previous water sample is not left in the water taking pipeline and the water pump, cross contamination among water samples at different depths is avoided, surrounding water can be effectively isolated in the lifting process of the water taking opening, and the authenticity of the sampled water sample is further ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of water quality detection, and specifically refers to a river water quality detection device. Background Art

[0002] As an important natural resource, the water quality of rivers is directly related to the balance of the ecological environment, human production and life, and the sustainable development of social economy. Therefore, accurate and comprehensive testing of river water quality is of vital importance. Traditional water quality testing methods usually require water samples to be collected and sent to the laboratory for analysis. This is because the laboratory is equipped with precise and professional instruments and equipment and analysis methods, which can accurately measure various physical and chemical indicators in water samples, such as pH value, dissolved oxygen, chemical oxygen demand (COD), biochemical oxygen demand (BOD), ammonia nitrogen, heavy metal ion content, organic pollutant concentration, etc. The comprehensive analysis of these indicators can comprehensively evaluate the water quality. However, the existing water quality testing sampling devices have some shortcomings in practical applications, which are mainly reflected in the following two aspects: Poor adaptability of multi-depth sampling: The water quality of rivers is not uniformly distributed. Due to the influence of factors such as light, temperature, and water flow, the physical and chemical properties and pollutant concentrations of water bodies at different depths may be significantly different. Therefore, in order to comprehensively and accurately evaluate the water quality of rivers, it is necessary to sample and test water samples at different depths separately. Some existing sampling devices use multiple water bottles arrays to achieve multi-depth sampling. These water bottles are usually connected by variable pitch mechanisms (such as scissor mechanisms, etc.) to achieve sampling at different depths. However, this method has obvious limitations. The number of water bottles is fixed and cannot be flexibly adapted to rivers of different depths. When the depth of different river channels changes, a fixed number of water bottles may not meet the requirements of equal depth interval sampling, because deep water channels require more water bottles, resulting in a reduced representativeness of the sampling results; and the design of multiple water bottles and variable pitch mechanisms increases the complexity of the device, increases its volume, and increases the manufacturing cost accordingly.

[0003] Sampling from a single water intake is prone to cross contamination: Other sampling devices use a single water intake and adjust the height of the water intake to achieve sampling at different depths. Although this method is relatively simple in structure, it has serious cross contamination problems. The water sample collected last time will remain in the water intake pipeline and water pump, and mix with the water sample collected next time, resulting in distorted water quality test results; when the water intake is raised and lowered between different depths, the surrounding water may enter the water intake, also causing water sample contamination. Summary of the invention

[0004] In view of the above situation, the present invention provides a river water quality detection device to ensure that when sampling at different depths, no water sample from the previous time will remain in the water intake pipeline and the water pump, thereby avoiding cross-contamination between water samples at different depths. During the raising and lowering process of the water intake, it can effectively isolate the surrounding water bodies and prevent irrelevant water bodies from entering the water intake, thereby further ensuring the authenticity of the water samples taken.

[0005] The technical solution adopted by the present invention is as follows: The present invention proposes a river water quality detection device, including a hull, a support plate is fixedly provided on the upper side of the front end of the hull, a spiral hose is fixedly provided on the lower side of the middle part of the support plate, a collecting tube is provided below the spiral hose, the upper wall of the collecting tube is fixedly connected to the lower end of the spiral hose, a lifting rope is fixedly connected to the center of the upper wall of the collecting tube, a winding and lifting mechanism and a pollution-free negative pressure driving mechanism are provided in the hull, the lifting rope passes upward through the center of the spiral hose and the support plate and is connected to the winding and lifting mechanism to realize the lifting and lowering of the collecting tube, the upper end of the spiral hose passes through the support plate and is connected to the pollution-free negative pressure driving mechanism, which is used to provide a negative pressure environment for water intake and avoid cross contamination, and a submersible collection, water separation and emptying mechanism is provided at the lower end of the collecting tube to avoid residual water samples from the previous time and effectively isolate the surrounding water during lifting and lowering.

[0006] Furthermore, the submersible collection and water-deprivation emptying mechanism includes a water intake hole, an interception cover and a sealing ring. The water intake hole is vertically penetrated and opened in the center of the lower wall of the collection tube. The interception cover is fixedly arranged on the outer side of the lower wall of the collection tube. The interception cover covers the water intake hole. A first sliding column is vertically fixedly arranged on the inner side of the interception cover directly facing the center. The first sliding column is coaxially arranged with the water intake hole and extends into the interior of the collection tube. The sealing ring is fixedly arranged on the inner side of the lower wall of the collection tube. The sealing ring is located at the edge of the water intake hole. A cylindrical plug is coaxially and tightly fitted on the sliding sleeve on the first sliding column. The side surface of the cylindrical plug can be tightly fitted with the sealing ring and the lower wall of the collection tube. A first limit head is fixedly arranged on the upper end of the first sliding column. A tension spring is sleeved on the outer side of the first sliding column. The two ends of the tension spring are respectively fixedly connected to the cylindrical plug and the interception cover.

[0007] Furthermore, the submersible collection and water-clearing mechanism also includes a drainage hole, a mounting rod and a horn cover. The drainage hole is vertically penetrated through the lower wall of the collection tube, and the drainage hole is located on one side of the water intake hole. The mounting rod is horizontally arranged at the upper end of the drainage hole, and the mounting rod is fixedly connected to the lower wall of the collection tube. A second sliding column is fixedly arranged on the lower side of the mounting rod, and the second sliding column is coaxially arranged with the drainage hole and extends out of the collection tube. The horn cover is fixedly arranged on the outer side of the lower wall of the collection tube, and the tightening end of the horn cover is coaxially located at the edge of the drainage hole. The horn cover expands vertically downward, and a second limit head is fixedly arranged at the lower end of the second sliding column. A conical plug is coaxially provided on the second sliding column and tightly fits the sliding sleeve, and the side surface of the conical plug can be tightly fit with the inner side surface of the horn cover.

[0008] Furthermore, when the tension spring is in the initial state, the side surface of the cylindrical plug is tightly attached to the lower wall of the collection tube, when the upper end of the cylindrical plug contacts the first limit head, the cylindrical plug is separated from the sealing ring, and when the lower end of the conical plug contacts the second limit head, the conical plug is separated from the horn cover.

[0009] Furthermore, the pollution-free negative pressure driving mechanism includes a water supply pipe and a collection platform, one end of the water supply pipe is sealed and connected with the upper end of the spiral hose, the collection platform is fixedly arranged in the hull, a support rod is fixedly arranged on the collection platform, a peristaltic pump is fixedly arranged on the upper end of the support rod, the peristaltic pump includes a mounting shell, a rotating assembly and a driving assembly, the mounting shell is fixedly connected to the support rod, the rotating assembly is rotatably arranged in the mounting shell, the output end of the driving assembly is coaxially fixedly connected with the rotating assembly, a pump pipe is clamped in the mounting shell, the pump pipe makes a 180-degree turn in the mounting shell, the turning center of the pump pipe is coaxially arranged with the rotating assembly, two rollers are symmetrically arranged along the axis on the rotating assembly, the rollers can compress the pump pipe, the other end of the water supply pipe is sealed and connected with one end of the pump pipe, and an air release valve is provided in the water supply pipe near the pump pipe.

[0010] Furthermore, the winding and lifting mechanism includes a bracket and a strut, the bracket is symmetrically fixed in the hull, a winding roller is rotatably provided between the upper ends of the bracket, the winding roller is wound around the sling, a connecting shaft at one end of the winding roller passes through the bracket and is fixedly provided with a rocker, an L-shaped rod is fixedly provided on the horizontal side of the upper end of the bracket on the same side as the rocker, the free section of the L-shaped rod is located parallel to the outside of the winding roller, a knob is provided on the outside of the free section of the L-shaped rod, and the threaded end of the knob can connect with the winding roller when threaded movement occurs with the free section of the L-shaped rod, the strut is fixedly provided on the upper side of the support plate, the strut is provided in plurality, the upper end of the strut is rotatably connected with a guide wheel, and the inner arc surface of the guide wheel is in close contact with the sling.

[0011] Furthermore, a rotary encoder is fixedly provided on the support rod close to the winding roller, and the connecting shaft of the guide wheel on the support rod passes through the support rod and is coaxially fixedly connected with the central axis of the rotary encoder.

[0012] Furthermore, a counterweight ring is coaxially fixedly provided on the lower end of the outer side of the collecting tube, and the counterweight ring is made of a high-density metal material.

[0013] Furthermore, the conical plug is made of a material with a density lower than that of water, and the cylindrical plug is made of a material with a density higher than that of water.

[0014] The beneficial effects achieved by the present invention using the above structure are as follows: (1) The submersible collection and drainage mechanism of this device ensures the high purity of the collected water samples through ingenious design. During the descent of the collection tube, the cylindrical plug closes the water intake hole under the action of the tension spring, and the conical plug keeps the drainage hole closed under the external water pressure, effectively isolating the surrounding water body. During sampling, the negative pressure generated by the peristaltic pump overcomes the tension of the tension spring, causing the cylindrical plug to move up and open the water intake hole. After sampling, the cylindrical plug returns to its original position to close the water intake hole. After rising above the water surface, the air release valve is opened, and the conical plug opens the drainage hole, and the water sample is completely discharged through the drainage hole. During the whole process, no water sample from the previous time will remain in the water intake pipeline (spiral hose, water supply pipe) and the pump tube of the peristaltic pump, thus avoiding cross contamination.

[0015] (2) This device adopts a pollution-free negative pressure drive mechanism, which generates negative pressure by squeezing the pump tube through the peristaltic pump, indirectly driving the water sample to rise. The water sample only contacts the pump tube, water supply pipe, spiral hose and the inside of the collection tube, avoiding direct contact with other complex components of the peristaltic pump, preventing the water sample from being contaminated, and also avoiding the problem of water sample remaining inside the water pump and being difficult to clean. The pump tube can be easily replaced, further ensuring the cleanliness of the system.

[0016] (3) The emptying operation of this device is extremely simple. It only requires lifting the collection tube above the water surface, opening the air release valve, and relying on gravity to quickly empty the water sample. No additional power or complicated operation is required. The entire device has a simple and compact structure, and the components are reliably connected. It can adapt to the harsh environment of long-term field and underwater work, and has strong practicality and durability. At the same time, the depth of the collection tube can be accurately controlled through the winding lifting mechanism and the rotary encoder to achieve fixed-depth sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a first three-dimensional structural schematic diagram of a river water quality detection device proposed by the present invention.

[0018] Figure 2 This is a second three-dimensional structural schematic diagram of a river water quality detection device proposed by the present invention.

[0019] Figure 3 This is a structural schematic diagram of the positional relationship between a spiral hose and a collection tube of a river water quality detection device proposed by the present invention.

[0020] Figure 4 This is a schematic diagram of the exploded structure of the positional relationship between a collecting tube and a submersible collecting, water-leaving and emptying mechanism of a river water quality detection device proposed by the present invention.

[0021] Figure 5 This is a bottom view of a collection tube of a river water quality detection device proposed by the present invention.

[0022] Figure 6 for Figure 5Middle AA section view.

[0023] Figure 7 for Figure 6 Enlarged view of part B.

[0024] Figure 8 for Figure 1 Enlarged view of part C.

[0025] Fig. 9 for Figure 3 Enlarged view of part D in the middle.

[0026] Fig.10 This is a schematic structural diagram of a peristaltic pump of a river water quality detection device proposed by the present invention.

[0027] Among them, 1. hull, 2. support plate, 3. spiral hose, 4. collection tube, 41. counterweight ring, 5. lifting rope, 6. diving collection and water discharge mechanism, 61. water intake hole, 62. interception cover, 63. first sliding column, 631. first limit head, 64. sealing ring, 65. cylindrical plug, 651. tension spring, 66. drainage hole, 67. mounting rod, 671. second sliding column, 672. second limit head, 68. horn cover, 69. cone Plug, 7, winding lifting mechanism, 71, bracket, 72, winding roller, 73, rocker, 74, L-shaped rod, 75, knob, 76, support rod, 77, guide wheel, 8, rotary encoder, 9, pollution-free negative pressure drive mechanism, 91, water supply pipe, 92, peristaltic pump, 921, installation shell, 922, rotating assembly, 923, roller, 924, drive assembly, 925, pump tube, 93, support rod, 94, collection table, 95, air release valve.

[0028] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be understood that terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 As shown, the present invention proposes a river water quality detection device, including a hull 1, a support plate 2 is fixedly provided on the upper side of the front end of the hull 1, a spiral hose 3 is fixedly provided on the lower side of the middle part of the support plate 2, a collecting tube 4 is provided below the spiral hose 3, the upper wall of the collecting tube 4 is fixedly connected to the lower end of the spiral hose 3, a lifting rope 5 is fixedly connected to the center of the upper wall of the collecting tube 4, a winding and lifting mechanism 7 and a pollution-free negative pressure driving mechanism 9 are provided in the hull 1, the lifting rope 5 passes upward through the center of the spiral hose 3 and the support plate 2 and is connected to the winding and lifting mechanism 7, the upper end of the spiral hose 3 passes through the support plate 2 and is connected to the pollution-free negative pressure driving mechanism 9, and a submersible collection and water-leaving emptying mechanism 6 is provided at the lower end of the collecting tube 4.

[0032] The hull 1 serves as a carrier of the entire device, providing buoyancy and installation space. The support plate 2 is fixed to the front end of the hull 1 to provide support for the spiral hose 3. The spiral hose 3 connects the collection tube 4 and the pollution-free negative pressure driving mechanism 9 to form a water sample delivery channel. The collection tube 4 is used to collect water samples. The lifting rope 5 connects the collection tube 4 and the winding and lifting mechanism 7 to control the lifting and lowering of the collection tube 4. The winding and lifting mechanism 7 and the pollution-free negative pressure driving mechanism 9 are respectively used to control the depth of the collection tube 4 and drive the water sample to rise. The submersible collection and water discharge mechanism 6 is used to control the water intake and drainage of the collection tube 4. The spiral hose 3 can be freely extended to adapt to different depths, which is an application well known to people in this field.

[0033] Among them, the submersible collection and water-separating emptying mechanism 6 includes a water intake hole 61, an interception cover 62 and a sealing ring 64. The water intake hole 61 vertically penetrates and is opened in the center of the lower wall of the collection tube 4. The interception cover 62 is fixedly arranged on the outer side of the lower wall of the collection tube 4. The interception cover 62 covers the water intake hole 61. A first sliding column 63 is vertically fixedly arranged on the inner side of the interception cover 62 directly facing the center. The first sliding column 63 is coaxially arranged with the water intake hole 61 and extends into the interior of the collection tube 4. The sealing ring 64 is fixedly arranged on the inner side of the lower wall of the collection tube 4. The sealing ring 64 is located at the edge of the water intake hole 61. A cylindrical plug 65 is coaxially and tightly slidably sleeved on the first sliding column 63. The side of the cylindrical plug 65 can be tightly attached to the sealing ring 64 and the lower wall of the collection tube 4. A first limit head 631 is fixedly arranged on the upper end of the first sliding column 63. A tension spring 651 is sleeved on the outer side of the first sliding column 63. The two ends of the tension spring 651 are respectively fixedly connected to the cylindrical plug 65 and the interception cover 62.

[0034] The water intake hole 61 is the water inlet of the collection tube 4. The interception cover 62 is used to prevent larger debris from entering the water intake hole 61. The sealing ring 64 is used to provide sealing when the cylindrical plug 65 closes the water intake hole 61. The first sliding column 63 guides the movement of the cylindrical plug 65. Under the action of the tension spring 651, the cylindrical plug 65 is usually in a state of closing the water intake hole 61. The first limit head 631 limits the upward movement of the cylindrical plug 65, and the tension spring 651 provides force for the cylindrical plug 65 to close the water intake hole 61.

[0035] Among them, the submersible collection and water-leaving emptying mechanism 6 also includes a drainage hole 66, a mounting rod 67 and a trumpet cover 68. The drainage hole 66 vertically penetrates and is opened in the lower wall of the collection tube 4. The drainage hole 66 is located on one side of the water intake hole 61. The mounting rod 67 is horizontally arranged at the upper end of the drainage hole 66. The mounting rod 67 is fixedly connected to the lower wall of the collection tube 4. A second sliding column 671 is fixedly arranged on the lower side of the mounting rod 67. The second sliding column 671 is coaxially arranged with the drainage hole 66 and extends out of the collection tube 4. The trumpet cover 68 is fixedly arranged on the outer side of the lower wall of the collection tube 4. The tightening end of the trumpet cover 68 is coaxially located at the edge of the drainage hole 66. The trumpet cover 68 expands vertically downward. A second limit head 672 is fixedly arranged at the lower end of the second sliding column 671. A conical plug 69 is coaxially close to the sliding sleeve on the second sliding column 671. The side surface of the conical plug 69 can be close to the inner side surface of the trumpet cover 68.

[0036] The drainage hole 66 is the drainage outlet of the collection tube 4. The mounting rod 67 is used to fix the second sliding column 671. The horn cover 68 provides sealing when the conical plug 69 closes the drainage hole 66. The second sliding column 671 guides the movement of the conical plug 69. The second limit head 672 limits the downward movement of the conical plug 69. Under the action of its own gravity, the conical plug 69 is usually in a state of opening the drainage hole 66.

[0037] Among them, when the tension spring 651 is in the initial state, the side of the cylindrical plug 65 is tightly attached to the lower wall of the collection tube 4, when the upper end of the cylindrical plug 65 contacts the first limit head 631, the cylindrical plug 65 is separated from the sealing ring 64, and when the lower end of the conical plug 69 contacts the second limit head 672, the conical plug 69 is separated from the horn cover 68.

[0038] This section describes the two extreme states of the cylindrical plug 65 and the conical plug 69. When the tension spring 651 is in the initial state, i.e., not stretched, the cylindrical plug 65 closes the water intake hole 61. When the cylindrical plug 65 is lifted upward until it contacts the first limit head 631, the water intake hole 61 is fully opened. When the conical plug 69 falls due to its own gravity until it contacts the second limit head 672, the drainage hole 66 is fully opened.

[0039] The pollution-free negative pressure driving mechanism 9 includes a water supply pipe 91 and a collection platform 94. One end of the water supply pipe 91 is sealed and connected to the upper end of the spiral hose 3. The collection platform 94 is fixed in the hull 1. A support rod 93 is fixed on the collection platform 94. A peristaltic pump 92 is fixed on the upper end of the support rod 93. The peristaltic pump 92 includes a mounting shell 921, a rotating assembly 922 and a driving assembly 924. The mounting shell 921 is fixedly connected to the support rod 93. The rotating assembly 922 is rotatably arranged in the mounting shell 921. The driving assembly 92 The output end of 4 is coaxially fixedly connected with the rotating component 922, and a pump pipe 925 is clamped in the mounting shell 921. The pump pipe 925 makes a 180-degree turn in the mounting shell 921. The turning center of the pump pipe 925 is coaxially arranged with the rotating component 922. Two rollers 923 are symmetrically arranged along the axis on the rotating component 922. The rollers 923 can compress the pump pipe 925. The other end of the upper water pipe 91 is sealed and connected with one end of the pump pipe 925. The upper water pipe 91 is sealed and connected with an air release valve 95 near the pump pipe 925.

[0040] The upper water pipe 91 connects the spiral hose 3 and the peristaltic pump 92, the collection table 94 provides an installation platform for the peristaltic pump 92, the support rod 93 supports the peristaltic pump 92, and the peristaltic pump 92 generates negative pressure by squeezing the pump tube 925 through the roller 923, thereby sucking the water sample from the collection tube 4. The pump tube 925 is a wearing part of the peristaltic pump 92 and can be easily replaced. The air release valve 95 is used to release the negative pressure in the pipeline when sampling is stopped.

[0041] Among them, the winding and lifting mechanism 7 includes a bracket 71 and a strut 76, the bracket 71 is symmetrically fixed in the hull 1, a winding roller 72 is rotatably provided between the upper ends of the brackets 71, and the winding roller 72 is wound around the sling 5. A connecting shaft at one end of the winding roller 72 passes through the bracket 71 and is fixed with a rocker 73, and an L-shaped rod 74 is fixed on the horizontal side of the upper end of the bracket 71 on the same side as the rocker 73. The free section of the L-shaped rod 74 is located parallel to the outside of the winding roller 72, and a knob 75 is provided on the outside of the free section of the L-shaped rod 74. The threaded end of the knob 75 can connect with the winding roller 72 when threaded movement occurs with the free section of the L-shaped rod 74, and the strut 76 is fixed on the upper side of the support plate 2. There are multiple struts 76, and the upper end of the strut 76 is rotatably connected with a guide wheel 77, and the inner arc surface of the guide wheel 77 is in close contact with the sling 5.

[0042] The winding roller 72 is used to reel in and release the sling rope 5, the rocker 73 is used to manually rotate the winding roller 72, the L-shaped rod 74 and the knob 75 constitute a locking mechanism for fixing any rotation angle of the winding roller 72, the support rod 76 and the guide wheel 77 are used to guide the movement of the sling rope 5 and reduce the wear of the sling rope 5.

[0043] A rotary encoder 8 is fixedly provided on a support rod 76 close to the winding roller 72 , and a connecting shaft of a guide wheel 77 on the support rod 76 penetrates through the support rod 76 and is coaxially fixedly connected with a central axis of the rotary encoder 8 .

[0044] The rotary encoder 8 is used to measure the length of the hanging rope 5 that is released, and can be reset to zero, thereby calculating the diving depth of the collection tube 4.

[0045] Among them, a counterweight ring 41 is coaxially fixedly provided at the lower end of the outer side of the collection tube 4, and the counterweight ring 41 is made of high-density metal material.

[0046] The weight ring 41 is used to increase the weight of the collection tube 4 so that it can sink smoothly and maintain stability in the water.

[0047] The conical plug 69 is made of a material with a density lower than that of water, and the cylindrical plug 65 is made of a material with a density higher than that of water.

[0048] The conical plug 69 is made of a material with a density lower than that of water, so that it can float when underwater and close the drainage hole 66. The cylindrical plug 65 is made of a material with a density higher than that of water, so that it can close the water intake hole 61 in the water and in combination with the tension of the tension spring 651.

[0049] During specific use, first use an independent depth sounding device (such as a sonar depth sounder) to measure the total depth of the river to be tested. According to the scientific research needs and the river depth, determine the number of water samples required for this test and the depth interval of each water sample. For example, if the river depth is 10 meters, if it is set to collect a water sample every 2 meters, the required sampling points can be calculated, and the assembled device is placed on the hull 1. The hull 1 is started so that the collection tube 4 is located above the river area to be tested, and the collection tube 4 is slowly lowered. When the collection tube 4 just touches the water surface, the data of the rotary encoder 8 is immediately reset to zero. At this time, the subsequent value recorded by the rotary encoder 8 represents the descending distance of the collection tube 4 relative to the water surface.

[0050] By shaking the rocker 73 of the winding lifting mechanism 7, the winding roller 72 is driven to rotate, and the hanging rope 5 is gradually released to slowly descend the collection tube 4. At the same time, the reading of the rotary encoder 8 is closely observed to ensure that the collection tube 4 accurately reaches the preset first sampling depth. During the descent of the collection tube 4, due to the action of the tension spring 651, the cylindrical plug 65 is always pressed against the sealing ring 64 to close the water intake hole 61 to prevent water samples from entering. At the same time, the conical plug 69 is tightly attached to the horn cover 68 due to the external water pressure and buoyancy, and water will not enter from the drainage hole 66. This can effectively avoid cross-contamination of water samples at different depths. When the collection tube 4 reaches the preset depth, stop turning the rocker 73. At this time, the knob 75 on the L-shaped rod 74 can be tightened. , so that its threaded end contacts the winding roller 72, thereby locking the winding roller 72, fixing the position of the collection tube 4, and starting the peristaltic pump 92 of the pollution-free negative pressure drive mechanism 9. The driving component 924 of the peristaltic pump 92 drives the rotating component 922 to rotate, and the roller 923 on the rotating component 922 periodically squeezes the pump tube 925, so that negative pressure is generated in the pump tube 925. Since a closed negative pressure environment is formed inside the spiral hose 3, the upper water pipe 91 and the collection tube 4, the negative pressure acts on the cylindrical plug 65 through the water intake hole 61. When the negative pressure continues to increase, the cylindrical plug 65 is lifted upward and leaves the sealing ring 64, the water intake hole 61 is opened, and the river water passes through the water intake hole 61, the spiral hose 3, the upper water pipe 91, and is finally sucked into the pump tube 925.

[0051] After collecting a sufficient amount of water sample, the peristaltic pump 92 is turned off. As the negative pressure in the pump tube 925 disappears, the cylindrical plug 65 is in close contact with the sealing ring 64 again under the tension of the tension spring 651, closing the water intake hole 61. At the same time, the conical plug 69 is always in close contact with the horn cover 68 under the action of buoyancy. The rocker 73 is shaken again, the lifting rope 5 is rolled up, the collection tube 4 is lifted above the water surface, and the air release valve 95 on the upper water pipe 91 is opened. At this time, the upper water pipe 91, the spiral hose 3 and the interior of the collection tube 4 are connected to the atmosphere to form an open channel. Due to the action of gravity, the water samples in the collection tube 4 and the upper water pipe 91 and the spiral hose 3 will flow along the channel to the outside. As the water flows downward, the conical plug 69 moves away from the horn cover 68 under the action of water and its own gravity, the drainage hole 66 is fully opened, and the water sample is discharged smoothly. In order to discharge the residual water sample in the pump tube 925, the peristaltic pump 92 can be started slightly to allow the roller 923 to rotate a short distance to squeeze out the part of the residual water sample in the pump tube 925 on the other side of the roller 923. After the emptying is completed, the air release valve 95 is closed to prepare for the next sampling. Before each sampling, the collection tube 4, the spiral hose 3, the water supply pipe 91 and the pump tube 925 have been emptied and there is no residual water sample. Therefore, it can be ensured that the water samples collected at each depth are independent and no cross contamination occurs.

[0052] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0053] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

[0054] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A river water quality detection device, comprising a hull (1), characterized in that: A support plate (2) is fixedly provided on the upper side of the front end of the hull (1), a spiral hose (3) is fixedly provided on the lower side of the middle part of the support plate (2), a collection tube (4) is provided below the spiral hose (3), the upper wall of the collection tube (4) is fixedly connected to the lower end of the spiral hose (3), a suspension rope (5) is fixedly connected to the center of the upper wall of the collection tube (4), a winding and lifting mechanism (7) and a pollution-free negative pressure driving mechanism (9) are provided in the hull (1), the suspension rope (5) passes through the center of the spiral hose (3) and the support plate (2) upwards and is connected to the winding and lifting mechanism (7), the upper end of the spiral hose (3) passes through the support plate (2) and is connected to the pollution-free negative pressure driving mechanism (9), and a submersible collection and water discharge mechanism (6) is provided at the lower end of the collection tube (4).

2. A river water quality detection device according to claim 1, characterized in that: The submersible collection and dewatering emptying mechanism (6) comprises a water intake hole (61), an interception cover (62) and a sealing ring (64); the water intake hole (61) is vertically penetrated and opened at the center of the lower wall of the collection tube (4); the interception cover (62) is fixedly arranged on the outer side of the lower wall of the collection tube (4); the interception cover (62) covers the water intake hole (61); a first sliding column (63) is vertically fixedly arranged on the inner side of the interception cover (62) directly facing the center; the first sliding column (63) is coaxially arranged with the water intake hole (61) and extends into the interior of the collection tube (4); the sealing ring (64) is 4) is fixedly arranged on the inner side of the lower wall of the collection tube (4), the sealing ring (64) is located at the edge of the water intake hole (61), a cylindrical plug (65) is coaxially and tightly fitted on the sliding sleeve of the first sliding column (63), and the side surface of the cylindrical plug (65) can be tightly fitted with the sealing ring (64) and the lower wall of the collection tube (4), a first limit head (631) is fixedly arranged on the upper end of the first sliding column (63), and a tension spring (651) is sleeved on the outer side of the first sliding column (63), and the two ends of the tension spring (651) are respectively fixedly connected to the cylindrical plug (65) and the interception cover (62).

3. A river water quality detection device according to claim 2, characterized in that: The submersible collection and dewatering mechanism (6) further comprises a drainage hole (66), a mounting rod (67) and a horn cover (68); the drainage hole (66) vertically penetrates and is opened on the lower wall of the collection tube (4); the drainage hole (66) is located on one side of the water intake hole (61); the mounting rod (67) is horizontally arranged at the upper end of the drainage hole (66); the mounting rod (67) is fixedly connected to the lower wall of the collection tube (4); a second sliding column (671) is fixedly arranged on the lower side of the mounting rod (67); the second sliding column (671) is connected to the lower wall of the collection tube (4); The drainage hole (66) is coaxially arranged and extends out of the collection tube (4); the horn cover (68) is fixedly arranged on the outer side of the lower wall of the collection tube (4); the tightening end of the horn cover (68) is coaxially located at the edge of the drainage hole (66); the horn cover (68) expands vertically downward; a second limit head (672) is fixedly arranged at the lower end of the second sliding column (671); a conical plug (69) is coaxially arranged on the second sliding column (671) in close contact with the sliding sleeve; and the side surface of the conical plug (69) can be in close contact with the inner side surface of the horn cover (68).

4. A river water quality detection device according to claim 3, characterized in that: When the tension spring (651) is in the initial state, the side surface of the cylindrical plug (65) is in close contact with the lower wall of the collection tube (4); when the upper end of the cylindrical plug (65) contacts the first limit head (631), the cylindrical plug (65) is separated from the sealing ring (64); when the lower end of the conical plug (69) contacts the second limit head (672), the conical plug (69) is separated from the horn cover (68).

5. A river water quality detection device according to claim 4, characterized in that: The pollution-free negative pressure driving mechanism (9) comprises a water supply pipe (91) and a collection platform (94); one end of the water supply pipe (91) is arranged in sealing communication with the upper end of the spiral hose (3); the collection platform (94) is fixedly arranged in the hull (1); a support rod (93) is fixedly arranged on the collection platform (94); a peristaltic pump (92) is fixedly arranged at the upper end of the support rod (93); the peristaltic pump (92) comprises a mounting shell (921), a rotating assembly (922) and a driving assembly (924); the mounting shell (921) is fixedly connected to the support rod (93); the rotating assembly (922) is rotatably arranged in the mounting shell (921); and the driving assembly (924) is fixedly arranged in the mounting shell (921). The output end of the component (924) is coaxially fixedly connected to the rotating component (922); a pump pipe (925) is clamped in the mounting shell (921); the pump pipe (925) makes a 180-degree turn in the mounting shell (921); the turning center of the pump pipe (925) is coaxially arranged with the rotating component (922); two rollers (923) are symmetrically arranged along the axis of the rotating component (922); the rollers (923) can press the pump pipe (925); the other end of the upper water pipe (91) is sealed and connected to one end of the pump pipe (925); and a relief valve (95) is sealed and connected to the upper water pipe (91) near the pump pipe (925).

6. A river water quality detection device according to claim 5, characterized in that: The winding and lifting mechanism (7) comprises a bracket (71) and a support rod (76), wherein the bracket (71) is symmetrically fixedly arranged in the hull (1), a winding roller (72) is rotatably arranged between the upper ends of the bracket (71), and the winding roller (72) is wound around the suspension rope (5), a connecting shaft at one end of the winding roller (72) passes through the bracket (71) and is fixedly provided with a rocker (73), and an L-shaped rod (74) is fixedly arranged on the horizontal side of the upper end of the bracket (71) on the same side as the rocker (73), and the L-shaped rod (74) The free section of the L-shaped rod (74) is parallel to the outside of the winding roller (72), and a knob (75) is provided on the outside of the free section of the L-shaped rod (74). The threaded end of the knob (75) can be connected with the winding roller (72) when threaded movement occurs with the free section of the L-shaped rod (74). The support rod (76) is fixedly arranged on the upper side of the support plate (2). The support rod (76) is provided in plurality. The upper end of the support rod (76) is rotatably connected to a guide wheel (77), and the inner arc surface of the guide wheel (77) is in close contact with the suspension rope (5).

7. A river water quality detection device according to claim 6, characterized in that: A rotary encoder (8) is fixedly provided on a support rod (76) close to the winding roller (72), and a connecting shaft of a guide wheel (77) on the support rod (76) passes through the support rod (76) and is coaxially fixedly connected to the central axis of the rotary encoder (8).

8. A river water quality detection device according to claim 7, characterized in that: A counterweight ring (41) is coaxially fixedly disposed at the lower end of the outer side of the collecting tube (4), and the counterweight ring (41) is made of a high-density metal material.

9. A river water quality detection device according to claim 8, characterized in that: The conical plug (69) is made of a material with a density lower than that of water, and the cylindrical plug (65) is made of a material with a density higher than that of water.

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