Collecting and sampling device for agricultural field running water evaluation

Abstract

The invention provides a collecting and sampling device for agricultural field running water evaluation. The collecting and sampling device comprises a collecting device, a water pump and a sampling cup, the collecting device comprises a square pipe, a collecting box, a water pumping pipe and a water inlet hole, the bottom end of the square pipe is pre-buried in the planting field, one side of the collecting box is attached to a ridge, the square pipe is connected to the other side of the collecting box, and the collecting box is communicated with the collecting box through the water inlet hole. When the collecting and sampling device is used, the collecting device is installed in a farmland to be tested, during installation, an assembly cavity is pre-dug in the installation position, the bottom of the collecting box is arranged in the assembly cavity, the bottom of the square pipe is attached to the farmland surface, the side, away from the square pipe, of the collecting box is attached to a ridge, assembly is convenient, and the collecting and sampling device is simple in structure and convenient to use. The device is small in occupied area, convenient to adapt to terrains of various regions, free of influence on farming, simple in structure, and low in cost, and does not need to consume more manpower to construct a runoff pool.

Description

Technical Field

[0001] The invention relates to the field of nutrient loss assessment of farmland runoff water, and in particular to a collection and sampling device used for farmland runoff water assessment. Background Art

[0002] Agricultural non-point source pollution refers to the process in which pollutants generated in agricultural activities enter water bodies through soil erosion, runoff or leakage, causing water pollution. Common pollutants in agricultural activities include pesticides, fertilizers, livestock and poultry manure, etc. These pollutants flow into groundwater through surface runoff or leakage, causing water quality deterioration and causing harm to aquatic ecosystems and human health.

[0003] Nitrogen, phosphorus and potassium are essential elements for the growth and development of crops, which has led to an increasing use of chemical fertilizers in farmland. However, due to imperfect agricultural management measures, the utilization rate of fertilizers is low, and most elements in fertilizers are not utilized. They are lost into the environment through various pathways, thus causing agricultural non-point source pollution. Among them, the loss of nitrogen and phosphorus through runoff is the main pathway causing agricultural non-point source pollution.

[0004] Currently, the main method for collecting farmland runoff water is to dig collection pools in the fields. Although this method can more accurately measure the water concentration and water volume during the runoff process, the construction of runoff pools is expensive, has high requirements on farmland conditions, and requires a lot of runoff collection work.

[0005] Therefore, it is necessary to provide a collection and sampling device for farmland runoff water assessment to solve the above technical problems. Summary of the invention

[0006] The present invention provides a collection and sampling device for farmland runoff water assessment, which solves the problem that the current main method for collecting farmland runoff water is to dig a collection pool in the field, etc., which has high requirements on farmland conditions.

[0007] In order to solve the above technical problems, the present invention provides a collection and sampling device for farmland runoff water assessment, comprising: a collection device, a water pump and a sampling cup; The collecting device comprises a square tube, a collecting box, a water pumping pipe and a water inlet hole, the bottom end of the square tube is pre-buried inside the planting site, one side of the collecting box is in contact with the field ridge, the square tube is connected to the other side of the collecting box, the collecting box is connected to the collecting box through the water inlet hole, the bottom of the water inlet hole is flush with the top of the field ridge, one end of the water pumping pipe extends into the interior of the collecting box, and the other end passes through the collecting box and extends to the outside of the collecting box; During rainfall, when rainwater entering the square tube overflows the water inlet hole, the rainwater enters the interior of the collection box through the water inlet hole. When the rainfall ends, the input end of the water pump is connected to the suction pipe through an assembly pipe, and the output end of the water pump is connected to the sampling cup through a water outlet pipe. The water pump works to pump rainwater inside the collection box into the sampling cup.

[0008] Preferably, the collecting device further comprises a box cover, and the box cover is installed on the top of the collecting box.

[0009] Preferably, the collection and sampling device for farmland runoff water assessment further comprises an assembly plate and a stopper, the assembly plate is mounted on the collection box and suspended above the square tube, a placement hole and an assembly groove are adjacently provided on the assembly plate, and a mounting seat is provided at the bottom of the water pump; Before the water pump is put into operation, the mounting seat of the water pump is placed inside the assembly groove, and the abutting member abuts the mounting seat against the inside of the assembly groove.

[0010] Preferably, the assembly pipe comprises a sleeve and a pusher, the sleeve is sleeved on one end of the water pumping pipe located outside the collecting box, and the pusher is used to drive the sleeve to move along one end of the water pumping pipe.

[0011] Preferably, the stopper comprises an inverted L-shaped block and a connecting arm, the inverted L-shaped block is slidably mounted inside the assembly groove, the connecting arm connects the inverted L-shaped block and the sleeve, and the mounting seat is in an inverted T-shape.

[0012] Preferably, a limiting plate is provided at one end of the assembly groove away from the inverted L-shaped block.

[0013] Preferably, the box cover includes a cover plate, a fixing ear and a rotating shaft, the rotating shaft is rotatably mounted on the collection box through the fixing ear, the cover plate blocks the top of the collection box, and one side of the cover plate is fixedly connected to the rotating shaft through a connecting block.

[0014] Preferably, the pushing member includes a driving arm and a gear, the driving arm is slidably mounted on the collecting box, one end of the driving arm is connected to the sleeve, and the other end of the driving arm is provided with a plurality of teeth to form a toothed plate structure, the gear is mounted on the rotating shaft, and the bottom of the gear is meshed with the toothed plate structure.

[0015] Preferably, the pushing member includes a connecting frame, a driving arm, a connecting sleeve, a slider and a driving block. The connecting frame is slidably installed on the collecting box, one end of the connecting frame is connected to the sleeve, and the slider is vertically slidably connected to the other end of the connecting frame. The connecting sleeve is sleeved on the rotating shaft, one end of the driving arm is connected to the connecting sleeve, and the other end of the driving arm is rotatably connected to the slider, and the driving block is installed inside the sleeve, and a driving block is symmetrically connected on the rotating shaft and located inside the sleeve.

[0016] Preferably, the collection and sampling device for farmland runoff water assessment also includes a positioning bolt, and the top and sides of the collection box are provided with threaded connectors. When the cover plate blocks the top of the collection box, one end of the positioning bolt passes through the cover plate and is threadedly connected to one of the threaded connectors.

[0017] Compared with the related art, the collection and sampling device for farmland runoff water assessment provided by the present invention has the following beneficial effects: The present invention provides a collection and sampling device for evaluating farmland runoff water. When in use, the collection device is installed in the farmland to be tested. During installation, an assembly cavity is pre-dug at the installation position, and the bottom of the collection box is arranged in the assembly cavity. The bottom of the square tube is attached to the farmland surface, and the side of the collection box away from the square tube is attached to the ridge. The device is easy to assemble, occupies a small area, is easy to adapt to the terrain of various regions, does not affect farming, and has a simple structure of the entire device, does not need to consume a lot of manpower to build a runoff pool, and reduces costs. When it rains, rainwater enters the inside of the square tube. When the liquid level of rainwater inside the square tube overflows the water inlet hole, it enters the collection box through the water inlet hole. After the rain stops, the staff carries a water pump and a sampling cup, connects the input end of the water pump to the suction pipe, and extends the outlet pipe of the output end of the water pump into the sampling cup. The rainwater collected in the collection box is introduced into the sampling cup through the water pump. The sampling operation is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A principle block diagram of a collection and sampling device for farmland runoff water assessment provided by the present invention; Figure 2 A schematic diagram of the structure of the collecting device provided by the present invention; Figure 3 for Figure 2 A cross-sectional view of the collection box shown; Figure 4 A schematic diagram of the distribution of the assembly board provided by the present invention; Figure 5 A schematic diagram of the structure when the pusher provided by the present invention is a drive arm and a gear; Figure 6 for Figure 4 An enlarged schematic diagram of part A is shown; Figure 7 for Figure 4 A partial cross-sectional view of the collection box and mounting plate shown; Figure 8 for Figure 7 An enlarged schematic diagram of part B is shown; Fig. 9 A schematic diagram of assembling a water pump and a sampling cup provided by the present invention on an assembly plate; Fig.10 A schematic diagram of the box cover provided by the present invention blocking the top of the collection box; Fig.11 This is a schematic diagram of the box cover provided by the present invention after it is opened.

[0019] Numbers in the figure: 1. Collection device; 11. Square tube; 12. Collection box; 13. Pumping pipe; 14. Water inlet hole; 15. Box cover; 121. Threaded connector; 111. Filter; 151, cover plate; 152, fixing ear; 153, rotating shaft; 154, driving block; 2. Water pump; 21. Water outlet pipe; 22. Mounting base; 3. Sampling cup; 31. Limiting ring; 4. Assembly plate; 41. Placement hole; 42. Assembly slot; 421. Limiting plate; 5. Stopper; 51. Inverted L-shaped block; 52. Connecting arm; 6. Assembling pipe fittings; 61. Sleeve; 62. Pushing member; 611, driving arm; 612, gear; 621, connecting frame; 622, driving arm; 623, connecting sleeve; 624, slider; 625, driving block; 7. Positioning bolt; 8. Planting ground; 9. Ridge. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0021] The invention provides a collection and sampling device for farmland runoff water assessment.

[0022] Please refer to Figures 1 to 3 , In one embodiment of the present invention, the collection and sampling device for farmland runoff water assessment comprises: a collection device 1, a water pump 2 and a sampling cup 3; The collecting device 1 comprises a square tube 11, a collecting box 12, a water pumping pipe 13 and a water inlet hole 14. The bottom end of the square tube 11 is pre-buried inside the planting land 8. One side of the collecting box 12 is in contact with the field ridge 9. The square tube 11 is connected to the other side of the collecting box 12. The collecting box 12 is connected to the collecting box 12 through the water inlet hole 14. The bottom of the water inlet hole 14 is flush with the top of the field ridge 9. One end of the water pumping pipe 13 extends into the interior of the collecting box 12, and the other end passes through the collecting box 12 and extends to the outside of the collecting box 12. During rainfall, when the rainwater entering the square tube 11 overflows the water inlet hole 14, the rainwater enters the interior of the collection box 12 through the water inlet hole 14. When the rainfall ends, the input end of the water pump 2 is connected to the suction pipe 13 through the assembly pipe 6, and the output end of the water pump 2 is connected to the sampling cup 3 through the outlet pipe 21. The water pump 2 works to pump the rainwater inside the collection box 12 into the sampling cup 3.

[0023] When in use, the collecting device 1 is installed in the farmland to be tested. During installation, an assembly cavity is pre-dug at the installation position, and the bottom of the collecting box 12 is set in the assembly cavity. The bottom of the square tube 11 is attached to the farmland surface, and the side of the collecting box 12 away from the square tube 11 is attached to the ridge 9. It is easy to assemble, occupies a small area, is easy to adapt to the terrain of various regions, does not affect farming, and the entire equipment has a simple structure, does not require much manpower to build a runoff pool, and reduces costs; When it rains, rainwater enters the square tube 11. When the liquid level of rainwater in the square tube 11 overflows the water inlet hole 14, it enters the collection box 12 through the water inlet hole 14. After the rain stops, the staff carries the water pump 2 and the sampling cup 3, connects the input end of the water pump 2 with the suction pipe 13, and extends the outlet pipe 21 at the output end of the water pump 2 into the sampling cup 3. The rainwater collected in the collection box 12 is introduced into the sampling cup 3 through the water pump 2. The sampling operation is simple and convenient.

[0024] After sampling is completed, the volume of the collected rainwater and the content of chemical elements such as phosphorus and nitrogen in the rainwater are tested; In this embodiment, a plurality of water inlet holes 14 are arranged in a row.

[0025] Among them, the surface of the sampling cup 3 is preferably provided with a volume scale, so that the volume of the collected rainwater can be directly read out, and there is no need to transfer the rainwater to a container with a volume scale for measurement. The sampling cup 3 is preferably provided with a cup cover, which is convenient for carrying after filling with water. The water pump 2 adopts a 12V or 24V micro water pump, which is easy to carry; a 220V ordinary water pump can also be used.

[0026] As an implementation of this embodiment, the length of the collection box 12 is the same as the width of the square tube 11; the ratio of the width of the collection box 12 to the length of the square tube 11 is 1:6; the ratio of the height of the collection box 12 to the length of the square tube 11 is 2:1; The square tube 11 covers an area of ​​1m 2 , the collection box 12 covers an area of ​​0.2m 2 The area of ​​the rice field where the square tube 11 generates runoff is 1m 2 After the runoff is generated by heavy rain, the rainwater in the collection box 12 is collected into the sampling cup 3 by the water pump 2, so as to obtain the corresponding farming method under 1m 2 The amount of runoff generated by rice fields and the content of total nitrogen and total phosphorus in the runoff water.

[0027] The collecting device 1 is mainly assembled from a plastic plate and an acrylic plate, and has low cost.

[0028] By using the collection and sampling device for farmland runoff water assessment, multiple experiments were conducted to study the loss of fertilizer nutrients in farmland runoff, rainwater samples were collected multiple times, and the contents of nitrogen, phosphorus, etc. in the samples were tested.

[0029] Experiment 1 1m under different tillage methods 2 The amount of runoff generated by rice fields and the content of total nitrogen and total phosphorus in the runoff water. The runoff and nutrient loss under different farming methods are shown in Tables 1, 2 and 3 below.

[0030] Table 1 Effects of different tillage methods on rice field runoff (unit: t / hm 2 )

[0031] Table 2 Effects of different tillage methods on total nitrogen concentration in rice field runoff (unit: mg / L)

[0032] Table 3 Effects of different tillage methods on total phosphorus concentration in rice field runoff (unit: mg / L)

[0033] Experiment 2 Similar to Experiment 1, the collection and sampling device for farmland runoff water assessment was used to study the runoff volume generated by rainfall and the loss of fertilizer nutrients in farmland runoff. However, Experiment 2 focused on studying the nutrient loss in runoff water under reduced fertilization conditions. By calculating the 1m 2 The runoff generated by the rice field and the nutrients in the water samples are used to obtain the overall situation of the corresponding treatment. The runoff and nutrient loss are shown in Table 4. Table 4 Statistics of rainfall time and runoff in rice fields

[0034] Table 5 Changes in total phosphorus concentration in runoff water from different treatments (unit: mg / L)

[0035] Table 6 Changes in soluble phosphorus concentration in runoff water from different treatments (unit: mg / L)

[0036] See also Figure 2 As an optional method of this embodiment, the collecting device 1 also includes a box cover 15, and the box cover 15 is installed on the top of the collecting box 12.

[0037] By providing a box cover 15 on the top of the collecting box 12, that is, the top of the collecting box 12 is provided with an opening, when the rainwater in the collecting box 12 is pumped out, the amount of rainwater collected in the collecting box 12 can be observed by opening the box cover 15, and when pumping out, it can be determined whether one sampling cup 3 is sufficient, thereby avoiding the situation where the amount of rainwater collected in the collecting box 12 is greater than the volume of one sampling cup 3, and the rainwater in the sampling cup 3 overflows when the rainwater is pumped out, resulting in partial loss of rainwater and inaccurate volume measurement.

[0038] At the same time, by setting the box cover 15, each time after the rainwater inside the collection box 12 is pumped out, clean water can be added to the inside of the collection box 12, and the inner wall of the collection box 12 can be cleaned with a cleaning brush to avoid nitrogen, phosphorus and other elements remaining on the inner wall of the collection box 12 to affect the next sampling and detection.

[0039] The cleaned water can be pumped out through the water pump 2 in cooperation with the water pump pipe 13 and the water outlet pipe 21 .

[0040] See also Figures 4 to 6 The collecting and sampling device for evaluating farmland runoff water further comprises an assembly plate 4 and a stopper 5, wherein the assembly plate 4 is mounted on the collection box 12 and suspended above the square tube 11, and a placement hole 41 and an assembly groove 42 are adjacently opened on the assembly plate 4, and a mounting seat 22 is provided at the bottom of the water pump 2; Before the water pump 2 is put into operation, the mounting seat 22 of the water pump 2 is placed inside the assembly groove 42 , and the abutting member 5 abuts the mounting seat 22 against the inside of the assembly groove 42 .

[0041] In this embodiment, the water pump 2 is the micro water pump used above, and when sampling rainwater inside the collection box 12, the water pump 2 and the sampling cup 3 are carried by the staff; By setting the assembly plate 4, before collecting rainwater, the sampling cup 3 can be placed in the placement hole 41, with its bottom abutting against the square tube 11, and the mounting seat 22 of the water pump 2 is placed in the assembly groove 42, and then the mounting seat 22 is pressed tightly by the abutment member 5 to prevent the water pump 2 from vibrating when working and causing the water pump 2 to be unstable. Therefore, it is unnecessary to manually hold the water pump 2 and the sampling cup 3, or to avoid placing the water pump 2 and the sampling cup 3 on the collection device 1, which will cause the water pump 2 to be unstable when working, and may cause the outlet pipe 21 to move out of the sampling cup 3 and cause rainwater outflow loss.

[0042] See also Figure 5 and Figure 6 As an optional method of this embodiment, the assembly pipe fitting 6 includes a sleeve 61 and a pusher 62, the sleeve 61 is sleeved on one end of the water suction pipe 13 located outside the collection box 12, and the pusher 62 is used to drive the sleeve 61 to move along one end of the water suction pipe 13.

[0043] When the mounting base 22 of the water pump 2 is placed into the assembly groove 42, the input end of the water pump 2 faces the water suction pipe 13. At this time, the input end of the water pump 2 is aligned with the water suction pipe 13, so that the pusher 62 pushes the sleeve 61 to be directly sleeved on the pipe at the input end of the water pump 2. The sleeve 61 connects the output end of the water pump 2 and the water suction pipe 13, and the assembly is simple and convenient.

[0044] The inner wall of the sleeve 61 is provided with a sealing ring to improve the sealing performance of the sleeve 61 connecting the output end of the water pump 2 and the water pumping pipe 13 .

[0045] See also Figure 5 and Figure 6 As an optional method of this embodiment, the stopper 5 includes an inverted L-shaped block 51 and a connecting arm 52, the inverted L-shaped block 51 is slidably installed inside the assembly groove 42, the connecting arm 52 connects the inverted L-shaped block 51 and the sleeve 61, and the mounting seat 22 is an inverted T-shape.

[0046] When the pusher 62 pushes the sleeve 61 to be mounted on the output end of the water pump 2, the sleeve 61 drives the inverted L-shaped block 51 to press against the mounting seat 22 of the water pump 2 through the connecting arm 52, thereby eliminating the need for additional separate operations to limit and tighten the water pump 2, thereby simplifying the operation.

[0047] As another optional method of this embodiment, the stopper 5 includes a mounting block, a bolt and an inverted L-shaped block 51. The mounting block is mounted on the mounting plate 4 and is located on one side of the mounting groove 42. The bolt passes through the mounting block and is threadedly connected to the mounting block. The inverted L-shaped block 51 is slidably set in the mounting groove 42 and is rotatably connected to the bolt. By turning the bolt, the bolt pushes the inverted L-shaped block 51 to press against the mounting seat 22, thereby limiting the water pump 2.

[0048] Please refer again Figure 5 and Figure 6 As a preferred embodiment of the present invention, a limiting plate 421 is provided at one end of the assembly groove 42 away from the inverted L-shaped block 51 .

[0049] Please refer to Fig.10 By setting the limiting plate 421, when the inverted L-shaped block 51 abuts and limits the mounting seat 22 of the water pump 2, the inverted L-shaped block 51 cooperates with the limiting plate 421 to limit the mounting seat 22 in the vertical direction at the same time, thereby improving the stability of the abutment.

[0050] See also Figure 6 In this embodiment, the box cover 15 includes a cover plate 151, a fixing ear 152 and a rotating shaft 153. The rotating shaft 153 is rotatably mounted on the collection box 12 through the fixing ear 152. The cover plate 151 blocks the top of the collection box 12, and one side of the cover plate 151 is fixedly connected to the rotating shaft 153 through a connecting block.

[0051] When opening the cover, the cover plate 151 is rotated along the rotating shaft 153 to one side of the collection box 12, which is easy to operate.

[0052] The rotating shaft 153 is rotatably mounted on the fixing ear 152 , and the fixing ear 152 is fixedly mounted on the collecting box 12 , so that the rotating shaft 153 is rotatably mounted on the collecting box 12 through the fixing ear 152 .

[0053] In other embodiments, the box cover 15 includes a cover plate 151, flanges are arranged around the bottom of the cover plate 151, grooves are correspondingly opened around the top of the collection box 12, and a handle is arranged on the top of the cover plate 151; when opening the cover, the cover plate 151 is lifted up by the handle to drive the flange to separate from the groove; when installing, the flange at the bottom of the cover plate 151 is inserted into the groove accordingly.

[0054] See also Figure 5 As an optional method of this embodiment, the pushing member 62 includes a driving arm 611 and a gear 612. The driving arm 611 is slidably installed on the collection box 12. One end of the driving arm 611 is connected to the sleeve 61, and the other end of the driving arm 611 is formed with a plurality of teeth to form a toothed plate structure. The gear 612 is installed on the rotating shaft 153, and the bottom of the gear 612 is meshed with the toothed plate structure.

[0055] When the cover is opened, the cover plate 151 rotates from the top of the collecting box 12 to one side thereof, and in the process of rotation, the rotating shaft 153 is driven to rotate, and the rotating shaft 153 simultaneously drives the gear 612 to rotate, and the rotation of the gear 612 acts on the teeth on the driving arm 611, pushing the driving arm 611 to move toward one side of the water pump 2, thereby driving the sleeve 61 to be sleeved on the pipe at the input end of the water pump 2, and at the same time, the sleeve 61 drives the inverted L-shaped block 51 through the connecting arm 52 to push the mounting seat 22 of the water pump 2 to move until it abuts against the mounting groove 42; Therefore, the water pumping pipe 13 can be connected to the input end of the water pump 2 and the water pump 2 can be tightly limited during the process of opening the cover, without the need for multiple operations, thus simplifying the operation; See also Figure 6 to Figure 7 As another optional method of this embodiment, the pushing member 62 includes a connecting frame 621, a driving arm 622, a connecting sleeve 623, a slider 624 and a driving block 625. The connecting frame 621 is slidably installed on the collection box 12, one end of the connecting frame 621 is connected to the sleeve 61, and the slider 624 is vertically slidably connected to the other end of the connecting frame 621. The connecting sleeve 623 is sleeved on the rotating shaft 153, one end of the driving arm 622 is connected to the connecting sleeve 623, and the other end of the driving arm 622 is rotatably connected to the slider 624. The driving block 625 is installed inside the sleeve 61, and the driving block 154 is symmetrically connected on the rotating shaft 153 and located inside the sleeve 61.

[0056] Please refer to Fig.10 and Fig.11 Similarly, during the process of opening the cover, the cover plate 151 drives the rotating shaft 153 to rotate, and the rotation of the rotating shaft 153 drives the two driving blocks 154 to rotate accordingly. After rotating one hundred and eighty degrees, one driving block 154 rotates with the driving block 625. The driving block 625 drives the driving arm 622 to rotate counterclockwise through the connecting sleeve 623. The driving arm 622 drives the slider 624 to move up along the connecting frame 621, and at the same time pushes the connecting frame 621 toward the direction of the water pump 2. The connecting frame 621 drives the sleeve 61 to be sleeved on the pipe at the output end of the water pump 2. Similarly, the sleeve 61 pushes the inverted L-shaped block 51 through the connecting arm 52 to abut the mounting seat 22 to limit the water pump 2.

[0057] The water extraction pipe 13 is connected to the input end of the water pump 2 and the water pump 2 is tightened and limited in position during the process of opening the cover.

[0058] When the cover plate 151 seals the top of the collecting box 12 again, it drives the rotating shaft 153 to rotate in the opposite clockwise direction, so that the other driving block 154 acts on the driving block 625 again after following the rotation of 180 degrees, and similarly drives the sleeve 61 to rotate. The sleeve 61 drives the driving arm 622 to rotate clockwise, and the connecting frame 621 is pulled back by the slider 624. The connecting frame 621 drives the sleeve 61 to separate from the input end of the water pump 2, and at the same time, the inverted L-shaped block 51 is pulled apart from the mounting seat 22 through the connecting arm 52, so as to facilitate the removal of the water pump 2.

[0059] In other embodiments, the pushing member 62 may include a mounting block, a bolt and a connecting block. The mounting block is installed on the collecting box 12. The bolt passes through the mounting block and is threadedly connected to the mounting block. One end of the connecting block is rotatably installed on the bolt, and the other end is connected to the sleeve 61.

[0060] See also Figure 7 As an optional method of this embodiment, the collection and sampling device for farmland runoff water assessment also includes a positioning bolt 7, and the top and side of the collection box 12 are provided with threaded connectors 121. When the cover plate 151 blocks the top of the collection box 12, one end of the positioning bolt 7 passes through the cover plate 151 and is threadedly connected to one of the threaded connectors 121.

[0061] By setting the positioning bolt 7 to cooperate with the threaded connector 121 on the top of the collection box 12, when the cover plate 151 blocks the top of the collection box 12, the positioning bolt 7 is threadedly connected with the threaded connector 121 after passing through the corresponding assembly hole on the cover plate 151, thereby improving the stability of the cover plate 151 blocking the collection box 12; When the cover 151 is opened, first unscrew the positioning bolt 7. After the cover 151 is opened, it fits against the side of the collection box 12. The positioning bolt 7 passes through the assembly hole again and is threadedly connected with the threaded connector 121 on the side. At this time, the cover 151 is more stably limited, that is, the rotating shaft 153 is limited. The rotating shaft 153 limits the sleeve 61 more stably through the pushing member 62, and the sleeve 61 can also limit the stop member 5 more stably.

[0062] The threaded connector 121 is a mounting shaft, and a threaded hole is correspondingly provided on the mounting shaft, and a nut etc. can also be preset on the mounting shaft. The mounting shaft is correspondingly mounted on the top and side of the side wall of the collection box 12 .

[0063] In one embodiment, a receiving box can be provided above the square tube 11, and the receiving box is connected to the collecting box 12 through a water pipe on which a valve is provided; the receiving box can collect rainwater, and after rainfall, after sampling the rainwater inside the collecting box 12, the valve can be opened when cleaning the inside thereof, so that rainwater that has not come into contact with the field can enter the inside of the collecting box 12, thereby facilitating the cleaning of the collecting box 12.

[0064] Preferably, a filter screen 111 is provided at the water inlet end of the square tube 11 . The filter screen 111 is made of a metal mesh or the like and is mainly used to filter larger impurities such as grass in the field from entering the square tube 11 along with rainwater.

[0065] A limiting ring 31 is preferably provided on the sampling cup 3. When the water outlet pipe 21 extends into the interior of the sampling cup 3, the water outlet pipe 21 can be limited by passing through the limiting ring 31; the water outlet pipe 21 is preferably a hose.

[0066] The limiting ring 31 includes an annular portion and a U-shaped portion. The annular portion is installed on one side of the U-shaped portion. The limiting ring 31 is assembled by clamping the U-shaped portion on the side wall of the sampling cup 3 .

[0067] The working principle of the collection and sampling device for farmland runoff water assessment provided by the present invention is as follows: When in use, the collecting device 1 is installed in the farmland to be tested. During installation, a pre-dug assembly cavity is made at the installation position, and the bottom of the collecting box 12 is set in the assembly cavity. The bottom of the square tube 11 is attached to the farmland surface, and the side of the collecting box 12 away from the square tube 11 is attached to the ridge 9, which is convenient for assembly. When it rains, rainwater enters the square tube 11. When the liquid level of rainwater in the square tube 11 overflows the water inlet hole 14, it enters the collection box 12 through the water inlet hole 14. After the rain stops, the staff carries the water pump 2 and the sampling cup 3, connects the input end of the water pump 2 with the suction pipe 13, and the outlet pipe 21 of the output end of the water pump 2 extends into the sampling cup 3. The rainwater collected in the collection box 12 is introduced into the sampling cup 3 through the water pump 2. The sampling operation is simple and convenient.

[0068] Before collecting rainwater, the sampling cup 3 can be placed in the placement hole 41, with its bottom abutting against the square tube 11, and the mounting base 22 of the water pump 2 is placed in the assembly groove 42. The box cover 15 can be opened to check the water storage amount inside the collection box 12 to determine how many sampling cups 3 need to be used.

[0069] When the cover is opened, the cover plate 151 rotates from the top of the collection box 12 to one side thereof, and in the process of rotation, the rotating shaft 153 is driven to rotate, and the rotating shaft 153 drives the pushing member 62 to drive the sleeve 61 to be sleeved on the pipe at the input end of the water pump 2. At the same time, the sleeve 61 drives the inverted L-shaped block 51 through the connecting arm 52 to push the mounting seat 22 of the water pump 2 to move until it abuts against the assembly groove 42, thereby realizing the tight limit of the water pump 2. Therefore, the water extraction pipe 13 can be connected to the input end of the water pump 2 and the water pump 2 can be tightened and limited at the same time during the process of opening the cover, without the need for multiple operations, thus simplifying the operation.

[0070] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A collection and sampling device for farmland runoff water assessment, characterized in that: include: Collection device, water pump and sampling cup; The collecting device comprises a square tube, a collecting box, a water pumping pipe and a water inlet hole, the bottom end of the square tube is pre-buried inside the planting site, one side of the collecting box is in contact with the field ridge, the square tube is connected to the other side of the collecting box, the collecting box is connected to the collecting box through the water inlet hole, the bottom of the water inlet hole is flush with the top of the field ridge, one end of the water pumping pipe extends into the interior of the collecting box, and the other end passes through the collecting box and extends to the outside of the collecting box; During rainfall, when rainwater entering the square tube overflows the water inlet hole, the rainwater enters the interior of the collection box through the water inlet hole. When the rainfall ends, the input end of the water pump is connected to the suction pipe through an assembly pipe, and the output end of the water pump is connected to the sampling cup through a water outlet pipe. The water pump works to pump rainwater inside the collection box into the sampling cup.

2. The collection and sampling device for farmland runoff water assessment according to claim 1, characterized in that: The collecting device further comprises a box cover, and the box cover is installed on the top of the collecting box.

3. The collection and sampling device for farmland runoff water assessment according to claim 2, characterized in that: The collecting and sampling device for farmland runoff water assessment also includes an assembly plate and a stopper, wherein the assembly plate is mounted on the collection box and suspended above the square tube, and a placement hole and an assembly groove are adjacently opened on the assembly plate, and a mounting seat is provided at the bottom of the water pump; Before the water pump is put into operation, the mounting seat of the water pump is placed inside the assembly groove, and the abutting member abuts the mounting seat against the inside of the assembly groove.

4. The collection and sampling device for farmland runoff water assessment according to claim 3 is characterized in that: The assembly pipe comprises a sleeve and a pusher. The sleeve is sleeved on one end of the water pumping pipe located outside the collecting box. The pusher is used to drive the sleeve to move along one end of the water pumping pipe.

5. The collection and sampling device for farmland runoff water assessment according to claim 4, characterized in that: The stopper comprises an inverted L-shaped block and a connecting arm. The inverted L-shaped block is slidably mounted inside the assembly groove. The connecting arm connects the inverted L-shaped block and the sleeve. The mounting seat is in an inverted T shape.

6. The collection and sampling device for farmland runoff water assessment according to claim 5, characterized in that: A limiting plate is arranged at one end of the assembly groove away from the inverted L-shaped block.

7. The collection and sampling device for farmland runoff water assessment according to claim 5, characterized in that: The box cover includes a cover plate, a fixing ear and a rotating shaft. The rotating shaft is rotatably mounted on the collection box through the fixing ear. The cover plate blocks the top of the collection box, and one side of the cover plate is fixedly connected to the rotating shaft through a connecting block.

8. The collection and sampling device for farmland runoff water assessment according to claim 7, characterized in that: The pushing member includes a driving arm and a gear. The driving arm is slidably mounted on the collecting box. One end of the driving arm is connected to the sleeve. The other end of the driving arm forms a toothed plate structure by being provided with a plurality of teeth. The gear is mounted on the rotating shaft, and the bottom of the gear is meshed with the toothed plate structure.

9. The collection and sampling device for farmland runoff water assessment according to claim 7, characterized in that: The pushing member includes a connecting frame, a driving arm, a connecting sleeve, a slider and a driving block. The connecting frame is slidably installed on the collecting box, one end of the connecting frame is connected to the sleeve, and the slider is vertically slidably connected to the other end of the connecting frame. The connecting sleeve is sleeved on the rotating shaft, one end of the driving arm is connected to the connecting sleeve, and the other end of the driving arm is rotatably connected to the slider. The driving block is installed inside the sleeve, and a driving block is symmetrically connected on the rotating shaft and located inside the sleeve.

10. The collection and sampling device for farmland runoff water assessment according to claim 7, characterized in that: The collecting and sampling device for farmland runoff water assessment also includes a positioning bolt. The top and sides of the collection box are provided with threaded connectors. When the cover plate blocks the top of the collection box, one end of the positioning bolt passes through the cover plate and is threadedly connected to one of the threaded connectors.

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