Bed sand sampler convenient for deep sampling of bed sand

Abstract

The invention relates to the technical field of bed sand samplers, and discloses a bed sand sampler convenient for deep sampling of bed sand, the bed sand sampler comprises a cube-shaped sand sampling cylinder, a cube-shaped sand sampling cavity in the sand sampling cylinder forms a bottom opening, and the side part of the sand sampling cylinder is provided with a sand outlet and a side part sealing cover plate; a bottom sealing cover plate is arranged at a bottom opening of the sand taking cylinder, the bottom opening is opened when the sand taking cylinder swings upwards deviating from the bottom opening, the bottom opening is sealed after the sand taking cylinder swings to a limit position from top to bottom, and the sand taking cylinder is provided with a limiting structure; the top of the sand taking cylinder is connected with a sand taking rod; the inner side wall of the sand taking cavity is provided with an orientation part and covered with an elastic film layer, the periphery of the elastic film layer is fixedly connected with the orientation part, and the elastic film layer is arranged in a bulged mode towards the sand outlet to surround a bulged area. When the sand taking cavity is filled with bed sand, the elastic film layer is compressed to deform, and when the side sealing cover plate opens the sand outlet, the elastic film layer expands towards the sand outlet to restore deformation and drives the bed sand towards the sand outlet, in conclusion, the convenience and the integrity of bed sand sampling are improved, and efficient sampling is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of bed sand samplers, and more specifically, to a bed sand sampler that facilitates in-depth sampling of bed sand. Background Art

[0002] Riverbed sampling is a conventional method for studying the physics, chemistry, mechanics, mineral structure, biology and pollution status of underwater sediments in rivers, reservoirs, lakes and coastal areas.

[0003] Traditional bed sand sampling devices, such as sand draggers, bucket samplers, piston samplers, etc., are mainly limited to sampling surface bed sand and cannot conduct stratified research on bed sand structure. These devices are usually simple in design, with small mouths and built-in capacities, and are difficult to adapt to sampling needs under different hydrogeological conditions.

[0004] In the existing technology, riverbed sampling devices mostly rely on a lot of manpower to drive, the mechanical parts of the sampling device are fixed and cannot be adjusted, the opening and closing door structure is not flexible and cannot be opened and closed automatically, and the sampling process obviously shows a low degree of automation. The sampling process is cumbersome, resulting in low efficiency and lack of convenience in bed sand sampling.

[0005] In addition, the existing bed sand sampling devices have limited adaptability to the environment, especially under conditions of deep water or high flow rate, the sampling success rate is not ideal. In particular, the larger samplers are easily affected by the water flow during the sampling process, and there are disturbances of "pushing" and "sweeping", which in turn leads to sample distortion. Summary of the invention

[0006] The purpose of the present invention is to provide a bed sand sampler which is convenient for deep sampling of bed sand, aiming to solve the problem of insufficient convenience of deep sampling of bed sand in the prior art.

[0007] The present invention is implemented as follows: it comprises a cubic sand collecting tube, wherein the sand collecting tube has a cubic sand collecting cavity, wherein the sand collecting cavity penetrates the bottom of the sand collecting tube to form a bottom opening, wherein a sand outlet is formed on the side of the sand collecting tube, wherein the sand outlet cover has a side cover plate which is swingably arranged and closes or opens the sand outlet;

[0008] The bottom opening of the sand collecting tube is covered with a bottom covering plate that is arranged to swing up and down. When the bottom covering plate deviates from the bottom opening and swings upward, the bottom opening is opened. When the bottom covering plate swings from top to bottom to the extreme position, the bottom covering plate closes the bottom opening. The sand collecting tube is provided with a limiting structure that limits the bottom covering plate from swinging downward away from the bottom opening. A detachable sand collecting rod is connected to the top of the sand collecting tube.

[0009] The inner side wall of the sand taking cavity has a facing portion arranged toward the sand outlet, the facing portion is covered with an elastic film layer, the outer periphery of the elastic film layer is fixedly connected to the facing portion, and the elastic film layer is arranged to bulge toward the sand outlet to surround and form a bulging area;

[0010] When the bed sand is squeezed to fill the sand taking cavity, the elastic membrane layer is compressed and deformed, and when the side cover plate opens the sand outlet, the elastic membrane layer expands toward the sand outlet to recover the deformation and drive the bed sand toward the sand outlet.

[0011] Furthermore, a plurality of elastic columns are provided in the bulging area, and the elastic columns are extended toward the sand outlet, one end of the elastic column is connected to the facing portion, and the other end of the elastic column is connected to the elastic membrane layer.

[0012] Furthermore, a flat and inelastic cardboard is connected to the middle of the elastic film layer, and the elastic film layer is arranged around the periphery of the cardboard and connected to the periphery of the cardboard; the other ends of the plurality of elastic columns are arranged around the periphery of the cardboard at intervals.

[0013] Furthermore, a connecting head is protruding from the top of the sand taking tube, and the sand taking rod is threadedly connected to the connecting head; the sand taking rod is connected to a detachable pressure rod, and the middle part of the pressure rod has a connecting section, and the connecting section is threadedly connected to the sand taking rod, and the pressure rod and the sand taking rod are arranged vertically.

[0014] Furthermore, one side of the side covering plate is hinged to the sand collecting barrel, and the other side of the side covering plate is provided with a clamping head, and the sand collecting barrel is provided with a hook. When the side covering plate covers the sand outlet, the hook is engaged and connected with the clamping head to relatively fix the side covering plate and the sand collecting barrel.

[0015] Furthermore, the sand taking tube has an air outlet for discharging air in the sand taking cavity, the sand taking cavity is connected to the outside through the air outlet, the air outlet is located above the sand outlet, and along the circumference of the sand taking tube, the air outlet and the sand outlet are staggered.

[0016] Furthermore, a rubber cover plate supported by a colloid material and closing or opening an air outlet is connected to the sand collecting tube. The rubber cover plate is arranged on the outer side wall of the sand collecting tube. One side of the rubber cover plate is fixedly connected to the sand collecting tube, and the other side of the rubber cover plate is freely arranged.

[0017] Furthermore, the limiting structure includes a limiting ring arranged at the bottom opening, the limiting ring is arranged around the circumference of the bottom opening, one side of the bottom covering plate is hinged to the sand collecting tube, the other side of the bottom covering plate is freely arranged, and the other side of the bottom covering plate has a pressing portion; when the bottom covering plate swings from top to bottom to the extreme position, the pressing portion presses on the limiting ring from top to bottom, and the bottom covering plate closes the bottom opening.

[0018] Furthermore, the side cover plate has an inner side wall facing the sand taking cavity, and a plurality of elastically arranged bending pieces are provided on the inner side wall, the lower ends of the bending pieces are fixed on the inner side wall, the upper ends of the bending pieces are bent upward and arranged freely, and there is an elastic interval between the bending pieces and the inner side wall;

[0019] When the side covering plate closes the sand outlet and the sand taking cavity is filled with bed sand, the elastic sheet is elastically deformed under pressure and embedded in the bed sand; when the side covering plate is opened, the elastic sheet is elastically restored to apply an elastic pulling force to the bed sand toward the sand outlet.

[0020] Furthermore, an outer periphery of the lower part of the sand collecting tube is provided with an outer periphery elastic ring and a movable ring that can elastically move up and down, and the outer periphery elastic ring is arranged around the circumference of the sand collecting tube and is located above the bottom opening;

[0021] The movable ring is sleeved on the outer circumference of the outer elastic ring and is fixedly connected to the outer elastic ring. The movable ring is arranged around the circumference of the sand collecting tube. A plurality of pointed convex teeth extend downward from the bottom of the movable ring. The plurality of convex teeth are arranged around the circumference of the movable ring. Adjacent convex teeth are arranged in an up-and-down staggered manner along the height direction of the movable ring.

[0022] The inner side of the movable ring has a movable inner wall arranged toward the bottom opening, and along the direction of the movable ring from bottom to top, the movable inner wall is arranged inwardly inclined, and the movable inner part is located below the bottom opening; the top of the movable inner wall has a top step, and the top step is arranged around the circumference of the sand collecting tube and is located below the sand collecting tube; a bottom gap is provided between the top step and the bottom of the sand collecting tube, and the bottom gap is filled with a bottom elastic ring, and the bottom elastic ring respectively abuts against the bottom of the sand collecting tube and the top step.

[0023] Compared with the prior art, the bed sand sampler provided by the present invention is convenient for deep sampling of bed sand. Through the cubic sand sampling tube and sand sampling cavity, combined with the automatic opening and closing mechanism of the bottom opening and the cover plate, it can effectively go deep into the bottom of the riverbed for sampling, ensure the complete collection of samples, and avoid loss during the sampling process;

[0024] The elastic membrane layer in the sand sampling cavity is compressed after the bed sand is filled. When the side cover plate opens the sand outlet, the elastic membrane layer recovers its deformation and pushes the bed sand toward the sand outlet, which not only simplifies the operation process of bed sand sampling, but also significantly improves the convenience of bed sand sampling.

[0025] The limiting structure of the sand collecting tube can effectively prevent the bottom cover plate from being damaged by external forces, thus enhancing the stability and durability of the sampler. Meanwhile, the detachable sand collecting rod design makes on-site operation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a front schematic diagram of a bed sand sampler provided by the present invention for facilitating in-depth sampling of bed sand;

[0027] Figure 2 is a schematic structural diagram of the elastic membrane layer provided by the present invention;

[0028] Figure 3 It is a structural schematic diagram of the extension rod provided by the present invention;

[0029] Figure 4 It is a structural schematic diagram of the pressure rod provided by the present invention;

[0030] Figure 5 It is a schematic diagram demonstrating the sampling process of the bed sand sampler provided by the present invention;

[0031] Figure 6 It is a schematic diagram demonstrating the sampling process of the bed sand sampler provided by the present invention;

[0032] Figure 7 It is a schematic structural diagram of the peripheral elastic ring and the movable ring provided by the present invention;

[0033] Figure 8 It is a structural schematic diagram of the convex teeth provided by the present invention;

[0034] In the figure: a sand taking tube 100, a side cover plate 101, a bending piece 102, an air outlet 103, a rubber cover plate 104, an elastic film layer 105, an elastic column 106, a cardboard 107, a clamping head 108, a hook 109, a facing portion 110, a bottom opening 200, a bottom cover plate 201, a limiting ring 202, a pressing portion 203, a bed sand 300, a sand taking rod 301, a connecting head 302, a pressure rod 303, an extension rod 304, an extension device 305, an outer peripheral elastic ring 400, a movable ring 401, a convex tooth 402, a movable inner wall 403, a top step 404, and a bottom elastic ring 405. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0037] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is 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. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0038] Reference Figure 1-8 The figure shows a preferred embodiment of the present invention.

[0039] The bed sand sampler is convenient for deep sampling of bed sand, comprising a cubic sand sampling tube 100, wherein the sand sampling tube 100 has a cubic sand sampling cavity, the sand sampling cavity runs through the bottom of the sand sampling tube 100 to form a bottom opening 200, a sand outlet is formed on the side of the sand sampling tube 100, and the sand outlet is covered with a side covering plate 101 which is swingably arranged and closes or opens the sand outlet;

[0040] The bottom opening 200 of the sand collecting barrel 100 is covered with a bottom covering plate 201 that swings up and down. When the bottom covering plate 201 swings upward away from the bottom opening 200, the bottom opening 200 is opened. When the bottom covering plate 201 swings from top to bottom to the extreme position, the bottom covering plate 201 closes the bottom opening 200. The sand collecting barrel 100 is provided with a limiting structure that limits the bottom covering plate 201 from swinging downward away from the bottom opening 200. A detachable sand collecting rod 301 is connected to the top of the sand collecting barrel 100.

[0041] The inner wall of the sand taking cavity has a facing portion 110 arranged toward the sand outlet, and the facing portion 110 is covered with an elastic film layer 105, the outer periphery of the elastic film layer 105 is fixedly connected to the facing portion 110, and the elastic film layer 105 is arranged to bulge toward the sand outlet to surround and form a bulging area;

[0042] When the bed sand 300 is squeezed and fills the sand taking cavity, the elastic membrane layer 105 is compressed and deformed, and when the side cover plate 101 opens the sand outlet, the elastic membrane layer 105 expands toward the sand outlet to recover the deformation and drives the bed sand 300 toward the sand outlet.

[0043] The bed sand sampler provided above, which is convenient for deep sampling of bed sand, can effectively conduct deep sampling at the bottom of the riverbed through the cubic sand sampling tube 100 and the sand sampling cavity, combined with the automatic opening and closing mechanism of the bottom opening 200 and the cover plate, to ensure complete collection of samples and avoid loss during the sampling process;

[0044] The elastic membrane layer 105 in the sand sampling cavity is compressed after the bed sand 300 is filled. When the side cover plate 101 opens the sand outlet, the elastic membrane layer 105 recovers its deformation and pushes the bed sand 300 toward the sand outlet, which not only simplifies the operation process of sampling the bed sand 300, but also significantly improves the convenience of sampling the bed sand 300.

[0045] The limiting structure of the sand collecting tube 100 can effectively prevent the bottom cover plate 201 from being damaged due to external forces, thereby enhancing the stability and durability of the sampler. Meanwhile, the detachable sand collecting rod 301 design makes on-site operation more convenient.

[0046] In this embodiment, a plurality of elastic columns 106 are provided in the bulging area, and the elastic columns 106 are extended toward the sand outlet. One end of the elastic column 106 is connected to the facing portion 110, and the other end of the elastic column 106 is connected to the elastic membrane layer 105. In this way, the elastic column 106 can provide additional support and elastic restoring force during the sampling process, which helps to more effectively push the bed sand 300 toward the sand outlet after the sand sampling cavity is filled, thereby improving the efficiency and convenience of sampling the bed sand 300.

[0047] In this embodiment, a flat and non-elastic cardboard 107 is connected to the middle of the elastic film layer 105, and the elastic film layer 105 is arranged around the periphery of the cardboard 107 and connected to the periphery of the cardboard 107; the other ends of the plurality of elastic columns 106 are arranged around the periphery of the cardboard 107 at intervals, so that the cardboard 107 provides a solid foundation, enhances the stability of the elastic film layer 105, and enables the elastic film layer 105 to distribute force more evenly when squeezed by the bed sand 300, thereby improving the consistency and reliability of sampling.

[0048] In this embodiment, a connector 302 is protruding from the top of the sand collecting tube 100, and the sand collecting rod 301 is threadedly connected to the connector 302. The threaded connection provides a firm and detachable connection, which facilitates the quick installation and removal of the sand collecting rod 301 before and after sampling, thereby improving the convenience of operation.

[0049] The sand collecting rod 301 is connected to a detachable pressure rod 303, the middle part of the pressure rod 303 is provided with a connecting section, the connecting section is threadedly connected to the sand collecting rod 301, the pressure rod 303 and the sand collecting rod 301 are arranged vertically. The vertically arranged pressure rod 303 can provide additional support force when needed, helping the sand collecting rod 301 to be more stably inserted into the riverbed, thereby ensuring the smooth progress of the bed sand 300 sampling process.

[0050] In this embodiment, one side of the side covering plate 101 is hinged to the sand collecting tube 100, and the other side of the side covering plate 101 is provided with a clamping head 108. The sand collecting tube 100 is provided with a hook 109. When the side covering plate 101 covers the sand outlet, the hook 109 is engaged and connected with the clamping head 108 to relatively fix the side covering plate 101 and the sand collecting tube 100.

[0051] Through this snap-fit ​​connection, the stability of the side cover plate 101 during the sampling process of the bed sand 300 is ensured, and accidental opening due to water flow impact or other external forces is prevented, thereby ensuring the integrity of the sample.

[0052] In this embodiment, the sand collecting tube 100 has an air outlet 103 for discharging air in the sand collecting chamber. The sand collecting chamber is connected to the outside through the air outlet 103. The air outlet 103 is located above the sand outlet. Along the circumference of the sand collecting tube 100, the air outlet 103 and the sand outlet are staggered.

[0053] By utilizing the staggered arrangement of the gas outlets 103 , the gas in the sand sampling chamber can be discharged smoothly during the sampling process, thus avoiding the influence of gas accumulation on the sampling, and making the sampling process of the bed sand 300 smoother.

[0054] In this embodiment, a rubber cover 104 supported by a colloid material and closing or opening the air outlet 103 is connected to the sand collecting tube 100. The rubber cover 104 is arranged on the outer wall of the sand collecting tube 100. One side of the rubber cover 104 is fixedly connected to the sand collecting tube 100, and the other side of the rubber cover 104 is freely arranged.

[0055] By using the rubber cover 104, a flexible sealing option is provided, and the gas outlet 103 can be opened or closed as needed, further controlling the emission of gas during the sampling process of the bed sand 300.

[0056] In this embodiment, the limiting structure includes a limiting ring 202 set at the bottom opening 200, and the limiting ring 202 is arranged around the circumference of the bottom opening 200. One side of the bottom covering plate 201 is hinged to the sand collecting tube 100, and the other side of the bottom covering plate 201 is freely arranged. The other side of the bottom covering plate 201 has a pressing portion 203; when the bottom covering plate 201 swings from top to bottom to the extreme position, the pressing portion 203 presses on the limiting ring 202 from top to bottom, and the bottom covering plate 201 closes the bottom opening 200.

[0057] The limiting structure precisely controls the swing range of the bottom cover plate 201 through the cooperation of the limiting ring 202 and the pressing portion 203, ensuring the accuracy and reliability of the cover plate when opening and closing the bottom opening 200, and avoiding sampling errors caused by excessive swing or instability.

[0058] The bottom cover plate 201 can also prevent river water or silt from leaking from the bottom opening 200 during the sampling process. While ensuring the integrity of the sample, the operator can more conveniently control the opening and closing of the bottom cover plate 201, thereby improving the efficiency and convenience of sampling the bed sand 300.

[0059] In this embodiment, the side cover plate 101 has an inner side wall facing the sand taking cavity, and a plurality of elastically arranged bending pieces 102 are provided on the inner side wall. The lower ends of the bending pieces 102 are fixed on the inner side wall, and the upper ends of the bending pieces 102 are bent upward and arranged freely, and there is an elastic interval between the bending pieces 102 and the inner side wall.

[0060] When the side covering plate 101 closes the sand outlet and the sand taking chamber is filled with bed sand 300, the elastic sheet is elastically deformed under pressure and embedded in the bed sand 300; when the side covering plate 101 is opened, the elastic sheet elastically returns to its original position, exerting an elastic pulling force on the bed sand 300 toward the sand outlet.

[0061] By utilizing the deformation and resetting of the elastic sheet to achieve effective pushing and sand removal of the bed sand 300, the elastic bending sheet 102 can adapt to bed sand 300 conditions of different hardness and density. Whether it is soft or hard bed sand 300, it can effectively sample and release, thereby enhancing the applicability and flexibility of the sampler.

[0062] The elastic effect of the bending piece 102 not only improves the sampling efficiency, but also ensures the continuity and integrity of the sample, avoids the sample scattering or loss due to the opening of the cover plate, and significantly improves the convenience and reliability of the bed sand 300 sampler in practical applications.

[0063] In this embodiment, the top of the sand collecting tube 100 is an extension device 305 of the sand collecting rod 301. The length of the extension rod 304 can be manually spliced ​​according to the water depth at the sand collecting location. Each extension rod 304 is designed to be 1m long. Multiple rods can be spliced ​​together and finally connected to a pressure rod 303. The pressure rod 303 is subjected to force to press the sampler into the riverbed.

[0064] In this way, sediment (bottom mud) samples can be collected from water bodies such as near the coast, reservoirs, lakes, rivers and beaches without disturbance sampling, maintaining the natural stratification of sediments. The extension rod 304 can be spliced ​​and extended, and can be easily operated by one person, solving the problem of collecting stratified bottom mud.

[0065] In this embodiment, the outer periphery of the lower part of the sand collecting tube 100 is provided with an outer peripheral elastic ring 400 and a movable ring 401 that moves elastically up and down, and the outer peripheral elastic ring 400 is arranged around the circumference of the sand collecting tube 100, and the outer peripheral elastic ring 400 is located above the bottom opening. The movable ring 401 is sleeved on the outer periphery of the outer peripheral elastic ring 400 and is fixedly connected to the outer peripheral elastic ring 400, and the movable ring 401 is arranged around the circumference of the sand collecting tube 100.

[0066] A plurality of pointed protruding teeth 402 extend downward from the bottom of the movable ring 401 . The plurality of protruding teeth 402 are arranged around the circumference of the movable ring 401 . Adjacent protruding teeth 402 are arranged in an up-and-down staggered manner along the height direction of the movable ring 401 .

[0067] The inner side of the movable ring 401 has a movable inner wall 403 arranged toward the bottom opening. Along the movable ring 401 from bottom to top, the movable inner wall 403 is arranged to tilt inwards, and the movable inner part is located below the bottom opening.

[0068] The top of the movable inner wall 403 has a top step 404, which is arranged around the circumference of the sand collecting tube 100 and is located below the sand collecting tube 100, with a bottom gap between it and the bottom of the sand collecting tube 100. The bottom gap is filled with a bottom elastic ring 405, which respectively abuts against the bottom of the sand collecting tube 100 and the top step 404.

[0069] During the sand taking process of the sand taking barrel 100, the plurality of convex teeth 402 can be used to facilitate drilling into the riverbed, and the plurality of convex teeth 402 are arranged in a high-low staggered manner, which is convenient for the drilling of the plurality of convex teeth 402 and avoids being stuck; secondly, during the drilling process of the sand taking barrel 100, after the movable ring 401 is compressed, it can elastically move up and down in the height direction under the action of the bottom elastic ring 405 and the outer elastic ring 400, and can achieve circumferential elastic deviation within a set range, so that the sand taking barrel 100 can drill into the riverbed in an elastic vibration state, thereby improving the drilling efficiency.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bed sand sampler for deep sampling of bed sand, characterized in that: It comprises a cubic sand collecting tube, wherein the sand collecting tube has a cubic sand collecting cavity, the sand collecting cavity runs through the bottom of the sand collecting tube to form a bottom opening, a sand outlet is formed on the side of the sand collecting tube, and the sand outlet cover has a side cover plate which is swingably arranged and closes or opens the sand outlet; The bottom opening of the sand collecting tube is covered with a bottom covering plate that is arranged to swing up and down. When the bottom covering plate deviates from the bottom opening and swings upward, the bottom opening is opened. When the bottom covering plate swings from top to bottom to the extreme position, the bottom covering plate closes the bottom opening. The sand collecting tube is provided with a limiting structure that limits the bottom covering plate from swinging downward away from the bottom opening. A detachable sand collecting rod is connected to the top of the sand collecting tube. The inner side wall of the sand taking cavity has a facing portion arranged toward the sand outlet, the facing portion is covered with an elastic film layer, the outer periphery of the elastic film layer is fixedly connected to the facing portion, and the elastic film layer is arranged to bulge toward the sand outlet to surround and form a bulging area; When the bed sand is squeezed to fill the sand taking cavity, the elastic membrane layer is compressed and deformed, and when the side cover plate opens the sand outlet, the elastic membrane layer expands toward the sand outlet to recover the deformation and drive the bed sand toward the sand outlet.

2. The bed sand sampler for deep sampling of bed sand as claimed in claim 1, characterized in that: A plurality of elastic columns are arranged in the bulging area, and the elastic columns are extended toward the sand outlet. One end of the elastic column is connected to the facing portion, and the other end of the elastic column is connected to the elastic membrane layer.

3. The bed sand sampler for deep sampling of bed sand as claimed in claim 2, characterized in that: A flat and non-elastic cardboard is connected to the middle of the elastic film layer, and the elastic film layer is arranged around the periphery of the cardboard and connected to the periphery of the cardboard; the other ends of the plurality of elastic columns are arranged around the periphery of the cardboard at intervals.

4. The bed sand sampler for deep sampling of bed sand according to any one of claims 1 to 3, characterized in that: A connector is protruding from the top of the sand collecting tube, and the sand collecting rod is threadedly connected to the connector; the sand collecting rod is connected to a detachable pressure rod, and a connecting section is provided in the middle of the pressure rod, and the connecting section is threadedly connected to the sand collecting rod, and the pressure rod and the sand collecting rod are arranged vertically.

5. The bed sand sampler for deep sampling of bed sand according to any one of claims 1 to 3, characterized in that: One side of the side covering plate is hinged to the sand collecting barrel, and the other side of the side covering plate is provided with a clamping head. The sand collecting barrel is provided with a hook. When the side covering plate covers the sand outlet, the hook is engaged with the clamping head to relatively fix the side covering plate and the sand collecting barrel.

6. The bed sand sampler for deep sampling of bed sand according to any one of claims 1 to 3, characterized in that: The sand taking tube has an air outlet for discharging air in the sand taking cavity. The sand taking cavity is connected to the outside through the air outlet. The air outlet is located above the sand outlet. Along the circumference of the sand taking tube, the air outlet and the sand outlet are staggered.

7. The bed sand sampler for deep sampling of bed sand as claimed in claim 6, characterized in that: The sand collecting tube is connected with a rubber cover plate supported by a colloid material and closing or opening an air outlet. The rubber cover plate is arranged on the outer side wall of the sand collecting tube. One side of the rubber cover plate is fixedly connected to the sand collecting tube, and the other side of the rubber cover plate is freely arranged.

8. The bed sand sampler for deep sampling of bed sand according to any one of claims 1 to 3, characterized in that: The limiting structure includes a limiting ring arranged at the bottom opening, the limiting ring is arranged around the circumference of the bottom opening, one side of the bottom covering plate is hinged to the sand collecting tube, the other side of the bottom covering plate is freely arranged, and the other side of the bottom covering plate has a pressing portion; when the bottom covering plate swings from top to bottom to the extreme position, the pressing portion presses on the limiting ring from top to bottom, and the bottom covering plate closes the bottom opening.

9. The bed sand sampler for deep sampling of bed sand according to any one of claims 1 to 3, characterized in that: The side cover plate has an inner side wall facing the sand taking cavity, and a plurality of elastically arranged bending pieces are arranged on the inner side wall, the lower ends of the bending pieces are fixed on the inner side wall, the upper ends of the bending pieces are bent upward and arranged freely, and there is an elastic interval between the bending pieces and the inner side wall; When the side covering plate closes the sand outlet and the sand taking cavity is filled with bed sand, the elastic sheet is elastically deformed under pressure and embedded in the bed sand; when the side covering plate is opened, the elastic sheet is elastically restored to apply an elastic pulling force to the bed sand toward the sand outlet.

10. The bed sand sampler for deep sampling of bed sand according to any one of claims 1 to 3, characterized in that: An elastic ring and a movable ring that can move up and down elastically are arranged on the outer periphery of the lower part of the sand collecting tube, and the outer peripheral elastic ring is arranged around the circumference of the sand collecting tube and is located above the bottom opening; The movable ring is sleeved on the outer circumference of the outer elastic ring and is fixedly connected to the outer elastic ring. The movable ring is arranged around the circumference of the sand collecting tube. A plurality of pointed convex teeth extend downward from the bottom of the movable ring. The plurality of convex teeth are arranged around the circumference of the movable ring. Adjacent convex teeth are arranged in an up-and-down staggered manner along the height direction of the movable ring. The inner side of the movable ring has a movable inner wall arranged toward the bottom opening, and along the direction of the movable ring from bottom to top, the movable inner wall is arranged inwardly inclined, and the movable inner part is located below the bottom opening; the top of the movable inner wall has a top step, and the top step is arranged around the circumference of the sand collecting tube and is located below the sand collecting tube; a bottom gap is provided between the top step and the bottom of the sand collecting tube, and the bottom gap is filled with a bottom elastic ring, and the bottom elastic ring respectively abuts against the bottom of the sand collecting tube and the top step.

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