Suspended load sediment sampler for detecting concentration and content of sediment at water recession opening

Abstract

The invention relates to the related technical field of hydrological sediment sampling, discloses a suspended load sediment sampler for detecting the sediment concentration content of a recession port, and aims to solve the problem of inaccurate sampling caused by leakage of a sampling barrel. Two barrel covers on the sampling barrel are regulated and controlled by a pair of closed magnetic blocks which are mutually repulsive; after the sampling cylinder samples at a specified depth, the two cylinder covers firmly abut against the openings in the two ends of the sampling cylinder through magnetic repulsion between the two closed magnetic blocks, the sealing performance of the sampling cylinder is guaranteed, meanwhile, the interior of the sampling cavity is always subjected to pressure generated when the piston push spring pushes the detection piston, and when leakage occurs in the sampling cylinder, the sampling cylinder is closed. After the detection piston is pressed by the piston push spring, the two cylinder covers are opened, and a medium in the sampling cavity is forced to be completely discharged outwards, so that an operator is warned that the sampling cylinder leaks, and finally the effects of sealing self-detection and leakage warning are achieved.

Description

Technical Field

[0001] The invention relates to the technical field related to hydrological sediment sampling, and in particular to a suspended sediment sampler for detecting sediment concentration content at a water outlet. Background Art

[0002] The Henan section of the Yellow River's old course is the Huanghuai alluvial plain. The reservoir area in the area is the riverbed of the Yellow River's old course, which is a high beach of the abandoned Yellow River. Historically, the Yellow River carried a large amount of silt and was deposited over the years. The terrain is high and generally 5 to 7 meters higher than the ground on both sides. Affected by the cutting of the river, the beach has a large undulation of microtopography, with obvious hills, slopes, flats and depressions. It is high in the west and low in the east, and the soil is mainly sandy, sandy loam brown soil tidal soil and tidal soil.

[0003] There is a national wetland park in the area, which is also the only internationally important wetland in Henan Province. The water quality and quantity must be guaranteed during the construction period. The reservoir area is also the source of water for urban life and industrial water in the region. The water quality and quantity must be guaranteed during the reservoir desilting construction.

[0004] How to properly handle the relationship among dredging projects, wetland protection and water supply safety is an important challenge facing reservoir dredging construction.

[0005] Due to the temporary occupation of land in the reservoir dredging construction area involving many ground attachments, many historical problems, a large workload of expropriation and relocation, complicated procedures, and great difficulty in temporary land use approval, the area of ​​land expropriation and relocation in the temporary siltation area is seriously insufficient, resulting in the problem of having nowhere to pile up some dredged earth.

[0006] The water is discharged into the reservoir under construction, and the concentration of discharged water in the siltation area is effectively controlled, so that the discharged water that meets the discharge concentration standard can flow back into the reservoir under dredging construction, reduce the sediment content in the discharged water, and reduce the amount of dredged earthwork, which is also one of the key problems.

[0007] Taking the instantaneous suspended sediment sampler as an example, its structure is usually cylindrical, with operable cylinder covers at both ends. During the sampling process, the cylinder covers at both ends will remain open so that the water sample can flow freely into the sampler. When the sampler reaches the preset specified depth, the operator will close the cylinder covers at both ends at the same time through remote control or preset mechanism to capture the instantaneous water sample at that depth. This sampler has been widely used in water quality monitoring and sediment research due to its easy operation, strong adaptability, high efficiency and accuracy. However, in actual application, the instantaneous suspended sediment sampler also faces some challenges. In particular, the sealing of the cylinder cover will be affected by many factors, such as garbage, impurities in the water, and wear after long-term use. These problems may cause the cylinder cover to be not closed tightly, which in turn causes deviations in the sampled medium in the sampler. When the leakage is small, it is often difficult for outsiders to detect, which may cause the collected water samples to fail to truly reflect the actual situation, thereby misleading subsequent analysis and research.

[0008] In order to solve the above problems, a suspended sediment sampler for detecting sediment concentration content at the water outlet was developed. Summary of the invention

[0009] The present invention proposes a suspended sediment sampler for detecting sediment concentration content at a water outlet, which has the advantages of sealed self-detection and leakage warning, and is used to solve the problem of inaccurate sampling caused by leakage of the sampling tube proposed in the above background technology.

[0010] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a suspended sediment sampler for detecting sediment concentration content at a water outlet, comprising: a sampling tube, with cover support arms hinged at both ends, and a tube cover installed on the cover support arms; a detection tube, fixed in the middle of the outer side of the sampling tube, and a guide tube symmetrically installed on the outer side of the detection tube; a closing magnetic block, movably installed inside the guide tube, and a starting push spring is connected between the closing magnetic block and the guide tube, the two closing magnetic blocks magnetically repel each other, an opening and closing pull rod is connected to the end of the closing magnetic block, and the other end of the opening and closing pull rod is movably connected to the cover support arm; a detection chamber, opened in the detection tube, and a detection piston movably installed in the detection chamber; a stopper tube, fixed in the middle of the detection tube, and a piston push spring is connected between the detection piston and the stopper tube; a driving pull frame, fixed above the detection piston, and a magnetic blocking frame is installed on the driving pull frame; a regulating mechanism is provided in the detection tube to enable the magnetic blocking frame to shield the closing magnetic block in time.

[0011] Furthermore, the first regulating mechanism includes: a traction rope connected to the magnetic shielding frame; and a pull rope connected to the sampling tube.

[0012] Furthermore, the second control mechanism includes: a driving pull frame movably installed on the inside of the detection cylinder, and a transmission pull rod is fixedly installed on the top of the driving pull frame, a pull rope is connected to the top of the transmission pull rod, a transmission pull block is fixedly installed on the bottom of the deceleration piston, the magnetic blocking frame is movably installed to the outside of the transmission pull block, a resistance-increasing top rod is movably installed inside the transmission pull block, and a resistance-increasing top spring is connected between the resistance-increasing top rod and the transmission pull block.

[0013] Furthermore, a forced reset push block is arranged on the top of the driving pull frame.

[0014] Furthermore, an overflow hole communicating with the detection cavity is provided on the outer side of the detection tube.

[0015] Furthermore, a buffer cavity is formed at the top of the deceleration piston and inside the detection cylinder, and a one-way air inlet valve and a small air buffer hole are arranged at the top of the detection cylinder.

[0016] Furthermore, a limited movement hole is provided at the bottom of the magnetic blocking frame, and a resistance increasing hole is provided at the side of the driving pulling frame.

[0017] The present invention has the following beneficial effects:

[0018] The invention provides a suspended sediment sampler for detecting sediment concentration at a water outlet. The sampling tube is equipped with two tube covers, which are intelligently controlled by a pair of mutually magnetically repelling closed magnetic blocks. When the sampling tube is lowered to a specified depth for sampling, the two closed magnetic blocks use the principle of magnetic repulsion to ensure that the two tube covers can be tightly and firmly pressed against the openings at both ends of the sampling tube, thereby effectively ensuring its sealing performance and preventing water samples from leaking during the collection process.

[0019] At the same time, the inside of the sampling chamber is always subject to the thrust of the piston push spring, which pushes the detection piston to apply a certain pressure to the sampling chamber. When the sampling tube leaks for some reason (such as the tube cover is not sealed tightly or the tube body is damaged), the pressure in the sampling chamber will drop rapidly. At this time, the pressure exerted by the piston push spring on the detection piston will no longer be subject to sufficient resistance, causing the detection piston to move and trigger the corresponding mechanism, thereby causing the two tube covers to open automatically. This design forces all the remaining media (including water samples and sediment) in the sampling chamber to be discharged outward, which serves as an obvious warning signal to remind the operator that the sampling tube has a leakage problem.

[0020] Through this innovative design, the suspended sediment sampler not only achieves efficient and accurate sediment water sample collection, but also has the function of self-detection and leakage warning. This feature greatly improves the reliability and safety of the sampling process, and provides a strong guarantee for the accurate detection of sediment content in the water body at the water outlet. Finally, the sampler successfully achieved real-time monitoring and automatic warning of sealing performance, providing more accurate and reliable data support for research and decision-making in related fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0022] The present invention may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0023] Figure 1 It is a schematic diagram of the overall external three-dimensional structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the overall internal three-dimensional structure of the present invention;

[0025] Figure 3 for Figure 2 The enlarged structural diagram at E in the middle;

[0026] Figure 4 It is a schematic diagram of the positions and structures of the magnetic shielding frame and the driving pull frame;

[0027] Figure 5 for Figure 4 The enlarged structural diagram at F in the middle;

[0028] Figure 6 Schematic diagram of the three-dimensional structure of the stopper tube.

[0029] In the figure: 1. sampling cylinder; 100. sampling chamber; 2. cylinder cover; 3. cover support arm; 4. detection cylinder; 400. detection chamber; 401. overflow hole; 402. buffer chamber; 5. guide tube; 6. opening and closing pull rod; 7. transmission pull rod; 8. pull rope; 9. one-way air inlet valve; 10. small air buffer hole; 11. deceleration piston; 12. magnetic blocking frame; 120. limit hole; 13. drive pull frame; 130. resistance increasing hole; 131. forced reset push block; 14. closing magnetic block; 140. starting push spring; 15. stopper tube; 16. detection piston; 160. piston push spring; 17. resistance increasing push rod; 170. resistance increasing push spring; 18. transmission pull block. DETAILED DESCRIPTION

[0030] 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.

[0031] For example, see Figure 1 and Figure 2It can be clearly seen that the sampling tube 1 is in the shape of a cylinder with a through middle, and both ends of the sampling tube 1 are hinged with cover arms 3, and correspondingly, the cover arms 3 are fastened with a tube cover 2 for sealing the end opening of the sampling tube 1 by bolts. In order to synchronously control the opening and closing of the two tube covers 2, refer to Figure 2 It can be seen that a detection tube 4 is fastened to the middle of the outer side of the sampling tube 1, and the central axis of the detection tube 4 is perpendicular to the central axis of the sampling tube 1. A guide tube 5 is symmetrically installed on the outer side of the detection tube 4. More specifically, a closing magnet 14 is movably installed inside the guide tube 5. Since there are two guide tubes 5, the closing magnets 14 in the two guide tubes 5 magnetically repel each other. An opening and closing pull rod 6 is fastened to the end of the closing magnet 14, and the other end of the opening and closing pull rod 6 is movably connected to the cover support arm 3. When the two closing magnets 14 repel each other, the opening and closing pull rod 6 is used to push their respective cover support arms 3 to deflect outward, so that the tube cover 2 is fastened to the end opening of the sampling tube 1. Since the closing force of the two tube covers 2 comes from the magnetic repulsion between the two closing magnets 14, combined with Figure 2 It can be clearly seen that the distance between the end of the opening and closing rod 6 and the hinged position of the cover support arm 3 and the sampling tube 1 is greater than the distance between the tube cover 2 and the hinged point. Therefore, when the opening and closing rod 6 pushes the cover support arm 3 and applies pressure to the tube cover 2, a force-saving lever is formed to further increase the closing strength of the tube cover 2.

[0032] In order to keep the tube cover 2 away from the sampling tube 1, the sampling tube 1 uses the port to collect water. Figure 2 , Figure 3 and Figure 6 It can be seen that a detection chamber 400 communicating with the sampling chamber 100 is provided inside the detection cylinder 4, and a detection piston 16 is movably installed in the detection chamber 400. When the detection piston 16 moves up and down along the detection chamber 400, the medium pressure in the sampling chamber 100 can be changed accordingly. The stopper tube 15 is fastened to the middle part of the detection cylinder 4 by bolts, and the cross-sectional shape of the stopper tube 15 is "L" shaped. On the one hand, the stopper tube 15 can be used to limit the upward movement of the detection piston 16. On the other hand, a piston push spring 160 is connected between the detection piston 16 and the stopper tube 15. Under the push of the elastic force of the piston push spring 160, the detection piston 16 is forced to always have a tendency to move downward. Furthermore, a driving frame 13 is fixedly installed above the detection piston 16, and a magnetic shielding frame 12 is installed on the driving frame 13. When the detection piston 16 drives the magnetic shielding frame 12 to move between the two closed magnetic blocks 14 through the driving frame 13, the magnetic shielding frame 12 shields the two closed magnetic blocks 14, thereby isolating the magnetic repulsion between the two. Figure 2It can be seen that a starting push spring 140 is connected between the closing magnetic block 14 and the guide tube 5. When the magnetic repulsion between the two closing magnetic blocks 14 is blocked by the magnetic blocking frame 12, the two closing magnetic blocks 14 are forced to approach each other under the push of the starting push spring 140. At the same time, when the closing magnetic block 14 pulls the opening and closing rod 6, the cover support arm 3 opens the tube cover 2, thereby realizing the opening of the two ends of the sampling tube 1.

[0033] In actual application, the regulating mechanism is used to realize that the magnetic shielding frame 12 can timely shield the closed magnetic block 14. For the first embodiment, an additional traction rope can be used to connect with the magnetic shielding frame 12, and the pull rope 8 can be used to connect with the sampling tube 1, so that the two pull ropes can be used to limit the position of the sampling tube 1 and the position of the magnetic shielding frame 12. Specifically, under normal conditions, when the traction rope does not pull the magnetic shielding frame 12, the detection piston 16 is forced to move downward under the elastic force of the piston push spring 160, and the magnetic shielding frame 12 is further pulled downward synchronously by the driving pull frame 13. When the magnetic shielding frame 12 moves downward and shields the two closed magnetic blocks 14, the magnetic repulsion between the two closed magnetic blocks 14 is blocked. Under the elastic force of the starting push spring 140, the two closed magnetic blocks 14 approach each other, and then the cover support arm 3 is pulled by the opening and closing pull rod 6, forcing the tube cover 2 to open.

[0034] The sampling tube 1 is released by pulling the rope 8 to move downward to the sampling depth, and then the traction rope is pulled, the magnetic shielding frame 12 is forced to move upward, and the driving pull frame 13 is used to pull the detection piston 16 upward and compress the piston push spring 160. As the magnetic shielding frame 12 moves upward, it will eventually move away from the two closed magnetic blocks 14. Afterwards, when the magnetic surfaces of the two closed magnetic blocks 14 face each other, under the influence of magnetic repulsion, the closed magnetic block 14 pushes the opening and closing pull rod 6 to force the cover support arm 3 to drive the tube cover 2 to deflect toward the opening of the sampling tube 1 until the opening of the sampling tube 1 is blocked.

[0035] At this time, the sampled medium is stored in the sampling chamber 100, and the sampling tube 1 is pulled up by the pull rope 8 to collect the water medium at this depth. If the tube cover 2 leaks due to a sealing problem, the detection piston 16 compresses the piston push spring 160 when it moves upward, so that the detection piston 16 is always pushed by the elastic force of the piston push spring 160 and compresses the medium in the sampling chamber 100. When a leak occurs, the pressurized medium in the sampling chamber 100 will be discharged from the leak. In addition, when the medium in the sampling chamber 100 is discharged outward, the detection piston 16 will be caused to move downward, thereby causing the magnetic shielding frame 12 to move downward and block the closed magnetic block 14 again. After that, the two closed magnetic blocks 14 are forced to approach again under the elastic force of the start-up push spring 140, and the tube cover 2 is opened according to the cover support arm 3, so that all the medium in the sampling tube 1 is discharged outward, so as to warn the operator that the sampling chamber 100 cannot be sampled normally due to a leak, and needs to be repaired.

[0036] Embodiment 2 is another method of regulating the mechanism in Embodiment 1. According to the prior art mentioned in Embodiment 1 and the background technology, when the sampling tube 1 reaches the specified depth, the tube cover 2 needs to be closed by external regulation, which will make the operation relatively cumbersome. For the purpose of more convenient sampling, please refer to Figure 2 , Figure 4 and Figure 5 It can be seen that a driving rack 13 is movably installed on the inner side of the detection tube 4, and a transmission pull rod 7 is fixedly installed on the top of the driving rack 13. Specifically, a rope threading hole is provided on the top of the transmission pull rod 7, through which the pull rope 8 can pass, and the pull rope 8 can be tightened by using a fastening screw, thereby ensuring a stable connection between the top of the transmission pull rod 7 and the pull rope 8. A transmission pull block 18 is fixedly installed on the bottom of the deceleration piston 11. It should be noted that the magnetic shielding frame 12 is movably installed to the outside of the transmission pull block 18, and the magnetic shielding frame 12 can move up and down along the transmission pull block 18. Different from the first embodiment, the magnetic shielding frame 12 and the driving rack 13 in the second embodiment slide relative to each other. Figure 2 and Figure 4 It can be seen that the driving rack 13 is limited by the detection piston 16 and can only move up and down, and the magnetic shielding rack 12 is limited by the transmission pull block 18 and can only move up and down. Therefore, it is ensured that the driving rack 13 and the magnetic shielding rack 12 can only move relative to each other up and down.

[0037] More specifically, combined with Figure 5 It can be seen that a resistance-increasing push rod 17 is movably installed inside the transmission pull block 18, and a resistance-increasing push rod 17 and a resistance-increasing push spring 170 are connected between the resistance-increasing push rod 17 and the transmission pull block 18. Correspondingly, a limited motion hole 120 is provided at the bottom of the magnetic shielding frame 12. When the resistance-increasing push rod 17 passes through the limited motion hole 120, the magnetic shielding frame 12 and the transmission pull block 18 can move synchronously. In addition, a resistance-increasing hole 130 is provided on the side of the driving pull frame 13. When the resistance-increasing push rod 17 is inserted into the resistance-increasing hole 130, a certain connection strength will be achieved between the driving pull frame 13 and the resistance-increasing push rod 17, so as to ensure that the driving pull frame 13, the magnetic shielding frame 12 and the transmission pull block 18 can move synchronously. A forced reset push block 131 is provided on the top of the driving pull frame 13. When the forced reset push block 131 moves downward, the forced reset push block 131 pushes the resistance increasing push rod 17, which will press the resistance increasing push rod 17 back into the limiting hole 120. Since the depth of the limiting hole 120 is relatively smaller than the end radius of the resistance increasing push rod 17, when the magnetic blocking frame 12 is pulled downward, it will cause the magnetic blocking frame 12 to separate from the transmission pull block 18.

[0038] In specific application, under normal conditions, the resistance-increasing push rod 17 passes through the limit hole 120 and reaches the resistance-increasing hole 130 under the elastic force of the resistance-increasing push spring 170. At the same time, the detection piston 16 moves downward under the elastic force of the piston push spring 160, and pulls the driving pull frame 13 to move downward synchronously. Since the driving pull frame 13, the magnetic blocking frame 12 and the transmission pull block 18 are relatively fixed at this time, the transmission pull block 18 moves downward synchronously by dragging, and the transmission pull block 18 pulls the pull rope 8 downward through the transmission pull rod 7. Since the downward movement of the magnetic blocking frame 12 will block the two closed magnetic blocks 14, thereby isolating the magnetic repulsion between the two, under the elastic force of the starting push spring 140, the opening and closing pull rod 6 moves the tube cover 2 away from the opening of the sampling tube 1 through the cover support arm 3, and the openings at both ends of the sampling tube 1 are completely opened.

[0039] After that, it is only necessary to control the length of the pull rope 8 to control the diving depth of the sampling tube 1. Specifically, by limiting the length of the pull rope 8, the sampling tube 1 is directly thrown into the water. When the sampling tube 1 reaches the desired depth, the pull rope 8 will be tightened. At this time, the sampling tube 1 is dragged downward under the action of gravity, and the pull rope 8 cannot continue to go down due to being restricted. Therefore, the pull rope 8 has a tendency to pull the deceleration piston 11 upward through the transmission pull rod 7. At the same time, the driving pull frame 13 pulls the detection piston 16 to move upward synchronously through the transmission pull block 18, the magnetic shielding frame 12 and the driving pull frame 13, and the detection piston 16 compresses the piston push spring 160 at the same time.

[0040] As the pull rope 8 pulls the transmission rod 7 upward, the detection piston 16 will eventually hit the stopper tube 15, and the upward transmission rod 7 will further pull the magnetic shielding frame 12 upward until the resistance increasing top rod 17 and the resistance increasing hole 130 are forced to separate. After that, as the magnetic shielding frame 12 moves further upward, the magnetic surfaces of the closed magnetic blocks 14 are again facing each other, and the two closed magnetic blocks 14 use magnetic repulsion to push the tube cover 2 to clamp the openings at both ends of the sampling tube 1.

[0041] Afterwards, the pull rope 8 is pulled upward to move the sampling tube 1 upward. If there is no leakage in the sampling tube 1, the sampling tube 1 continues to move upward as the pull rope 8 is pulled until the operator takes out the sampling medium in the sampling cavity 100. If the sampling tube 1 leaks, the detection piston 16 will continue to move downward under the elastic force of the piston push spring 160. The downward movement of the detection piston 16 will cause the driving pull frame 13 to move downward synchronously. Finally, when the forced reset push block 131 moves to the position of the resistance increasing push rod 17, the forced reset push block 131 pushes the resistance increasing push rod 17 to further compress the resistance increasing push spring 170, and as the resistance increasing push rod 17 applies a downward pulling force to the magnetic blocking frame 12, the magnetic blocking frame 12 and the transmission pull block 18 are forced to separate. When the magnetic blocking frame 12 follows the driving pull frame 13 downward, the magnetic blocking frame 12 will block the closing magnetic block 14 again, thereby isolating the magnetic repulsion between the closing magnetic blocks 14. Finally, under the elastic force of the starting push spring 140, the tube cover 2 will open again, causing all the sampling medium in the sampling chamber 100 to be discharged outward.

[0042] Embodiment 3 As a supplement to Embodiment 2, before the cylinder cover 2 is closed, the detection piston 16 will not be pushed by the piston push spring 160 to press the detection chamber 400 downward. Figure 2 and Figure 3 It can be seen that an overflow hole 401 communicating with the detection chamber 400 is provided on the outside of the detection tube 4. The overflow hole 401 is provided to further ensure that the movement of the detection piston 16 must be after the closing of the tube cover 2. Specifically, when the pull rope 8 pulls the transmission pull block 18, the magnetic shielding frame 12 and the driving pull frame 13 upward synchronously through the transmission pull rod 7, the detection piston 16 follows the driving pull frame 13 to move upward synchronously and squeeze the piston push spring 160. The upward detection piston 16 will first pass over the overflow hole 401. After that, as the magnetic shielding frame 12 moves upward again, the magnetic shielding frame 12 will release the shielding of the magnetic repulsion between the closed magnetic blocks 14. The closed magnetic blocks 14 that have released the shielding will seal the tube cover 2 at the end of the sampling tube 1. As the pull rope 8 pulls the magnetic shielding frame 12 further upward, the detection piston 16 will eventually hit the stopper tube 15, thereby limiting the detection piston 16 from further upward movement. At this time, after the transmission pull rod 7 pulls the transmission pull block 18 and the magnetic shielding frame 12 to continue upward, the resistance-increasing push rod 17 and the resistance-increasing hole 130 are separated. Finally, the driving pull frame 13 and the magnetic shielding frame 12 are separated, and the upward driving pull frame 13 eventually hits the top of the detection cylinder 4. After the resistance-increasing push rod 17 is separated from the resistance-increasing hole 130, the detection piston 16 is forced to move downward and cross the overflow hole 401 under the push of the piston push spring 160. If the sampling cylinder 1 leaks, the detection piston 16 will move further downward until the forced reset push block 131 hits the resistance-increasing push rod 17; on the contrary, if the sealing performance in the sampling chamber 100 is good, the detection piston 16 will be affected by the incompressibility of the medium in the detection chamber 400 and cannot move downward again.

[0043] Moreover, this method can not only ensure that the detection piston 16 will lag behind the action after the cylinder cover 2 is closed, but also because after the driving pull frame 13 and the resistance-increasing push rod 17 are separated, the detection piston 16 has a tendency to move downward. When the subsequent sampling cylinder 1 is taken out and the cylinder cover 2 needs to be opened, it is only necessary to press the transmission pull rod 7 downward to push the magnetic shielding frame 12 to move downward synchronously until the magnetic shielding frame 12 blocks the closing magnetic block 14, thereby facilitating the opening of the cylinder cover 2 and pouring out the sampling medium in the sampling chamber 100, thereby achieving the purpose of facilitating the opening and closing of the cylinder cover 2.

[0044] As for how to reset the resistance increasing push rod 17 to the resistance increasing hole 130 again, after the medium in the sampling tube 1 is taken out, the transmission pull rod 7 continuously applies downward pressure, which will eventually make the resistance increasing hole 130 and the limiting hole 120 aligned again, and pushed by the elastic force of the resistance increasing push spring 170, the resistance increasing push rod 17 is forced to pass through the limiting hole 120 and then reach the resistance increasing hole 130, finally completing the connection between the resistance increasing push rod 17 and the driving pull frame 13.

[0045] On the basis of the above, combined with Figure 2 It can be clearly seen that a buffer chamber 402 is provided at the top of the deceleration piston 11 and inside the detection tube 4, and a one-way air intake valve 9 for one-way air intake from the outside to the buffer chamber 402 is fixedly installed on the top of the detection tube 4, and a small air intake hole 10 is provided on the top of the detection tube 4, so that the airflow in the buffer chamber 402 can be slowly discharged to the outside, thereby reducing the upward speed of the deceleration piston 11. The advantage of this method is that, as mentioned above, under normal conditions, the deceleration piston 11 moves downward and uses the one-way air intake valve 9 to inhale a large amount of air into the buffer chamber 402. When the sampling tube 1 is thrown into the water, the sampling tube 1 will continue to move downward due to gravity until the pull rope 8 is tightened and the deceleration piston 11 is pulled upward through the transmission pull rod 7. If the sampling cylinder 1 and the pull rope 8 are accidentally and briefly tightened during the falling process, the deceleration piston 11 will squeeze and buffer the airflow in the buffer chamber 402 to prevent the deceleration piston 11 from moving upward quickly after the two are briefly tightened, causing the cylinder cover 2 to be mistakenly closed before the sampling cylinder 1 reaches the specified depth.

[0046] Moreover, when the sampling tube 1 falls to the specified depth, the deceleration piston 11 that continues to descend will squeeze the airflow in the buffer chamber 402, so that the airflow is continuously discharged from the slow air hole 10. After the airflow is discharged from the slow air hole 10 into the water, since the density of air is much smaller than the density of water, when the air is in the water, it will be subject to an upward buoyancy. This buoyancy is greater than the gravity of the air itself, so the air (or bubble) will move upward until it reaches the water surface and breaks. Therefore, the operator can judge whether the sampling tube 1 has reached the limit position based on the bubbles generated on the water surface, and after the bubbles are finished, it can be known that the driving pull frame 13 has moved to the top of the detection tube 4, that is, the tube cover 2 has been closed, so the operator can be warned to close the tube cover 2, and it can be pulled up using the pull rope 8. It can be seen that when the sampling tube 1 reaches the specified position, the deceleration piston 11 will compress the air in the buffer chamber 402 and continue to move upward, which will cause the sampling tube 1 to remain stationary in the water for a period of time, so that the sampling medium in the sampling chamber 100 corresponds to the actual environment at that depth, thereby further ensuring the accuracy of sampling.

Claims

1. A suspended sediment sampler for detecting sediment concentration at a water outlet, characterized in that: include: The sampling tube (1) has cover support arms (3) hinged at both ends, and a tube cover (2) is installed on the cover support arms (3); The detection tube (4) is fixed to the middle part of the outer side of the sampling tube (1), and a guide tube (5) is symmetrically installed on the outer side of the detection tube (4); A closing magnetic block (14) is movably mounted inside the guide tube (5), and a starting push spring (140) is connected between the closing magnetic block (14) and the guide tube (5). The two closing magnetic blocks (14) magnetically repel each other. An opening and closing pull rod (6) is connected to the end of the closing magnetic block (14), and the other end of the opening and closing pull rod (6) is movably connected to the cover support arm (3); A detection chamber (400) is provided inside the detection cylinder (4), and a detection piston (16) is movably installed in the detection chamber (400); The stopper tube (15) is fixed at the middle of the detection cylinder (4), and a piston push spring (160) is connected between the detection piston (16) and the stopper tube (15); A driving rack (13) is fixed above the detection piston (16), and a magnetic shielding rack (12) is installed on the driving rack (13); A regulating mechanism is provided in the detection tube (4) to enable the magnetic shielding frame (12) to shield the closed magnetic block (14) in a timely manner.

2. The suspended sediment sampler for detecting sediment concentration at a water outlet according to claim 1, characterized in that: The first regulating mechanism comprises: a traction rope connected to a magnetic blocking frame (12); A pull rope (8) is connected to the sampling tube (1).

3. The suspended sediment sampler for detecting sediment concentration at a water outlet according to claim 1, characterized in that: The second regulating mechanism comprises: a driving pull frame (13) is movably mounted inside the detection tube (4), a transmission pull rod (7) is fixedly mounted on the top of the driving pull frame (13), a pull rope (8) is connected to the top of the transmission pull rod (7), a transmission pull block (18) is fixedly mounted on the bottom of the deceleration piston (11), a magnetic shielding frame (12) is movably mounted on the outside of the transmission pull block (18), a resistance increasing push rod (17) is movably mounted inside the transmission pull block (18), and a resistance increasing push rod (17) is connected between the resistance increasing push rod (17) and the transmission pull block (18).

4. The suspended sediment sampler for detecting sediment concentration at a water outlet according to claim 3, characterized in that: A forced reset push block (131) is arranged on the top of the driving pull frame (13).

5. The suspended sediment sampler for detecting sediment concentration at the water outlet according to claim 3 is characterized in that: An overflow hole (401) communicating with the detection cavity (400) is provided on the outside of the detection cylinder (4).

6. The suspended sediment sampler for detecting sediment concentration at a water outlet according to claim 3, characterized in that: A buffer chamber (402) is formed at the top of the deceleration piston (11) and inside the detection cylinder (4), and a one-way air inlet valve (9) and a small air buffer hole (10) are arranged at the top of the detection cylinder (4).

7. The suspended sediment sampler for detecting sediment concentration at a water outlet according to claim 6, characterized in that: A limited movement hole (120) is provided at the bottom of the magnetic blocking frame (12), and a resistance increasing hole (130) is provided at the side of the driving pulling frame (13).

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