Offshore seabed coarse sand vibration extraction device and extraction method

Abstract

The application discloses a kind of offshore seabed coarse sand vibration extraction device and extraction method, extraction device, including sand pumping pipe, flushing device and vibration device, the sand pumping pipe is equipped with sand pump and includes import end and export end, the flushing device includes flushing pipe, the flushing pipe includes inlet in seawater layer and outlet close to sand pumping pipe import end and set up upwards, the vibration device includes downwards close to export end and set up and the vibration of conical shell that is small on big below, the vibration of conical shell can be movably wrapped in sand pumping pipe outside and drive unit is equipped in it, the drive unit can drive vibration of conical shell to loosen nearby compact coarse sand, make sand gravel of sand pumping pipe import end liquidization, it is convenient fast and efficient extraction.The present application has reasonable structure, ingenious design, and is favorable to improve sand pumping efficiency.

Description

Technical Field

[0001] This invention relates to the field of seabed sand mining technology, specifically to a vibratory extraction device and method for extracting coarse seabed sand in nearshore areas. Background Technology

[0002] Nearshore waters consist of a seawater layer, a silt layer, a fine sand layer, and a coarse sand layer. The coarse sand particles in the coarse sand layer form a sand skeleton with a compact texture and large pores. In existing technologies, high-pressure water or high-pressure air is usually used to disturb the gravel to extract the sand. However, due to the presence of the coarse sand skeleton, the released high-pressure water or air can easily pass through the coarse sand skeleton and be released, making it difficult to destroy the coarse sand skeleton and resulting in the problem of "not being able to extract or not being able to extract". Summary of the Invention

[0003] This invention discloses a vibratory extraction device and method for coarse sand from the nearshore seabed. It solves the technical problems of difficulty and low efficiency in extracting coarse sand layers in existing technologies, and features a reasonable structure, ingenious design, and improved sand extraction efficiency. The technical solution adopted is as follows:

[0004] A nearshore seabed coarse sand vibration extraction device includes a sand extraction pipe, a flushing device, and a vibration device. The sand extraction pipe is equipped with a sand extraction pump and includes an inlet end and an outlet end. The inlet end can extend into the coarse sand layer, and the outlet end is connected to the sand storage box of a sand transport vessel on the sea surface. The flushing device includes a flushing pipe, which includes an inlet located in the seawater layer and an outlet located upward near the inlet end of the sand extraction pipe. A water pump is installed on the flushing pipe to discharge seawater under pressure through the outlet. The vibration device includes a vibratory shell located downward near the outlet end and is conical in shape with a smaller top and a larger bottom. The vibratory shell is movably wrapped around the sand extraction pipe and has a drive unit inside. The drive unit can drive the vibratory shell to vibrate to loosen the nearby compacted coarse sand.

[0005] Based on the above technical solution, the flushing pipe includes an upper section, a middle section and a lower section from top to bottom. The middle section is located inside the sand dredging pipe and fixed to the inner wall of the sand dredging pipe. The water pump is located on the middle section. The middle section passes through the side wall of the sand dredging pipe and communicates with the upper section. The middle section passes through the side wall of the sand dredging pipe and communicates with the lower section.

[0006] Based on the above technical solution, the outlet of the flushing pipe is connected to a jet nozzle, and the outlet of the jet nozzle is inclined downward and faces the central axis of the sand pumping pipe.

[0007] Based on the above technical solution, the vibratory impact housing includes a through hollow cavity, the sand extraction pipe passes through the hollow cavity and is connected to the inner wall of the hollow cavity through a number of radially arranged elastic elements, and flexible rubber pads are provided at the upper and lower ports of the hollow cavity to seal the hollow cavity. The vibratory impact housing is conical with a taper of 1 to 4.

[0008] Based on the above technical solution, the driving unit includes two vibration motors disposed inside the vibratory impact housing. The two vibration motors are radially symmetrically disposed inside the vibratory impact housing and can drive the vibratory impact housing to vibrate radially relative to the sand extraction pipe.

[0009] Based on the above technical solution, the drive unit also includes a hydraulic cylinder fixed to the sand extraction pipe. The piston rod of the hydraulic cylinder extends into the vibratory impact housing and is connected to the vibratory impact housing to drive the vibratory impact housing to swing up and down relative to the sand extraction pipe.

[0010] Based on the above technical solution, the drive unit further includes an electromagnetic vibrator disposed within the vibratory impact housing. The piston rod of the hydraulic cylinder is connected to the vibratory impact housing via a flexible material. The electromagnetic vibrator includes two brushes, two current contactors, two arc-shaped magnetic strips, a metal circuit, and a non-uniform mass disk. The two current contactors are evenly arranged circumferentially. The two ends of the metal circuit are respectively connected to the two current contactors, and the bottom end of the metal circuit is connected to the non-uniform mass disk, which is fixed on the inner bottom surface of the vibratory impact housing. The two brushes are fixedly arranged radially symmetrically and can contact the current contactors. The two brushes can be respectively connected to the two ends of an AC power supply. The two arc-shaped magnetic strips are fixedly arranged symmetrically and are respectively the S pole and N pole.

[0011] Based on the above technical solution, the non-uniform mass disk is crescent-shaped, and the bottom end of the metal circuit is in contact with the non-uniform mass disk through a connecting axis.

[0012] A method for vibratory extraction of coarse sand from the nearshore seabed, employing the vibratory extraction device for coarse sand from the nearshore seabed as described above, includes the following steps:

[0013] Before the inlet end of the sand dredging pipe contacts the seabed silt layer, turn on the vibratory motor and the sand dredging pump.

[0014] When the inlet of the flush pipe is located below sea level, turn on the water pump;

[0015] When the sand dredging pipe is lowered to the set depth, the hydraulic cylinder is activated to drive the vibratory casing to vibrate up and down, so that the coarse sand at the inlet end of the sand dredging pipe is in a liquefied state that is easy to extract, and at the same time the sand dredging pump is activated to start dredging.

[0016] After the sand dredging is completed, shut down the sand dredging pump, vibratory motor, water pump, and hydraulic cylinder.

[0017] Based on the above technical solution, the nearshore seabed coarse sand vibration extraction device also includes an electromagnetic vibrator. The piston rod of the hydraulic cylinder is connected to the vibratory shell through a flexible material. The electromagnetic vibrator includes two brushes, two current contactors, two arc-shaped magnetic strips, a metal circuit, and a non-uniform mass disk. The two current contactors are evenly arranged circumferentially. The two ends of the metal circuit are respectively connected to the two radially symmetrical current contactors. The bottom end of the metal circuit is connected to the non-uniform mass disk, which is fixed on the inner bottom surface of the vibratory shell. The two brushes are radially symmetrical and fixedly arranged, and the brushes can contact the current contactors. The two brushes can be respectively connected to the two ends of an AC power supply. The two arc-shaped magnetic strips are symmetrically fixedly arranged and are respectively the S pole and N pole.

[0018] The electromagnetic vibrator and hydraulic cylinder work alternately.

[0019] Beneficial effects

[0020] The present invention has a reasonable structure. The vibratory compaction shell is located near the inlet end of the sand extraction pipe. The vibratory compaction shell is conical with a smaller top and a larger bottom. After the sand extraction pipe first extracts part of the sand and gravel from the inlet end, a partial cavity is formed below the vibratory compaction shell, which is conducive to the formation of a liquefaction zone. At this time, the vibratory motor can drive the vibratory compaction shell to vibrate radially to loosen the sand skeleton near the outer circumference of the vibratory compaction shell. Under the action of gravity, the loose sand and gravel can flow from top to bottom and from the outside to the inside to the vicinity of the inlet end of the sand extraction pipe and form a coarse sand liquefaction zone. At the same time, the high-pressure water output of the jet nozzle further enhances the liquefaction effect of the sand and gravel liquefaction zone and avoids the formation of tightly structured sand and gravel blocks.

[0021] The invention also includes a hydraulic cylinder that can drive the vibratory compactor housing to vibrate up and down. This can disturb the sand skeleton falling to the top of the vibratory compactor housing, causing it to loosen and flow to the coarse sand liquefaction zone. At the same time, the up and down vibration of the vibratory compactor housing can also disturb the upper sand skeleton, causing it to fall downwards evenly and quickly. On the one hand, this is beneficial to improving the sand extraction efficiency, and on the other hand, it can effectively expand the influence area of ​​the vibration of the vibratory compactor housing and enhance the destructive effect on the sand skeleton.

[0022] The invention also includes an electromagnetic vibrator, which drives the vibratory casing to rotate alternately forward and backward around the sand extraction pipe. On the one hand, it can loosen the surrounding sand and gravel, and on the other hand, it can make the vibratory motor and hydraulic cylinder act more evenly on the surrounding sand skeleton. In this way, the vibratory casing can vibrate the surrounding sand skeleton evenly and densely, which can effectively destroy the coarse sand skeleton and improve the sand extraction efficiency.

[0023] In this invention, the flushing pipe can be partially housed within the sand extraction pipe, which helps to extend the service life of the flushing pipe and reduce its submersion resistance. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention. For those skilled in the art, other embodiments can be derived from the provided drawings without creative effort.

[0025] Figure 1 : A schematic diagram of the structure of the present invention in its working state;

[0026] Figure 2 Schematic diagram of the invention Figure 2 ;

[0027] Figure 3 : A three-dimensional structural schematic diagram of the present invention;

[0028] Figure 4 Schematic diagram of the electromagnetic vibrator inside the vibratory casing;

[0029] Figure 5 A schematic diagram of the structure of the current contactor in its initial position in a top view of an electromagnetic vibrator;

[0030] Figure 6 A schematic diagram of the structure of the current contactor after rotation in a top view of an electromagnetic vibrator; Detailed Implementation

[0031] The following description and accompanying drawings fully illustrate specific embodiments described herein to enable those skilled in the art to practice them. Some embodiments may include or substitute parts and features of other embodiments. The scope of the embodiments herein encompasses the entire scope of the claims and all available equivalents thereof. Throughout this document, the terms “first,” “second,” etc., are used only to distinguish one element from another without requiring or implying any actual relationship or order between the elements. Indeed, a first element can also be referred to as a second element, and vice versa. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure, apparatus, or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a structure, apparatus, or device. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the structure, apparatus, or device that includes said element. The various embodiments described herein are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments; similar or identical parts between embodiments can be referred to interchangeably.

[0032] The terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used in this document to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings. They are used solely for the convenience of describing the document and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In the description herein, unless otherwise specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two elements; they can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0033] In this document, unless otherwise stated, the term "multiple" means two or more.

[0034] In this article, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0035] In this article, the term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0036] like Figures 1-6 The present invention relates to a nearshore seabed coarse sand vibration extraction device, comprising a sand extraction pipe 1, a flushing device and a vibration device. The sand extraction pipe 1 is equipped with a sand extraction pump and includes an inlet end and an outlet end. The inlet end can extend into the coarse sand layer, and the outlet end is connected to the sand storage box of a sand transport vessel on the sea surface.

[0037] The flushing device includes a flushing pipe 2, which has an inlet located in the seawater layer and an outlet located upwards near the inlet of the sand-dredging pipe 1. A water pump 3 is installed on the flushing pipe 2 to discharge seawater under pressure through the outlet. Figure 1 As shown, the outlet of the flushing pipe 2 is connected to a jet nozzle, and the outlet of the jet nozzle is inclined downward and faces the central axis of the sand-draining pipe 1, so that the sand entering the sand-draining pipe 1 is in a fluid state. In addition, the flushing pipe 2 includes an upper section, a middle section and a lower section from top to bottom. The middle section is located inside the sand-draining pipe 1 and fixed to the inner wall of the sand-draining pipe 1. The water pump 3 is located on the middle section. The middle section passes through the side wall of the sand-draining pipe 1 and communicates with the upper section. The middle section passes through the side wall of the sand-draining pipe 1 and communicates with the lower section. This can improve the service life of the flushing pipe 2 and reduce the submersion resistance of the flushing pipe 2.

[0038] The vibration device includes a conical vibratory shell 4, which is positioned downwards near the outlet end and is wider at the bottom than at the top. The vibratory shell 4 is movably wrapped around the sand extraction pipe 1. Specifically, the vibratory shell 4 includes a through hollow cavity. The sand extraction pipe 1 passes through the hollow cavity and is connected to the inner wall of the hollow cavity through several radially arranged elastic elements. Flexible rubber pads are also provided at the upper and lower ports of the hollow cavity. The flexible rubber pads seal the hollow cavity. In this embodiment, the flexible rubber pads have sufficient structural strength to overcome the pressure difference between the inside and outside of the hollow cavity. The vibratory shell 4 is conical with a taper of 2.5. In other embodiments of the present invention, the taper of the vibratory shell can be 1 to 4.

[0039] like Figure 1 As shown, the vibratory compaction shell 4 is a hollow structure, containing a drive unit that can drive the shell to vibrate and loosen the nearby compacted coarse sand. In this embodiment, the drive unit includes a vibratory motor, a hydraulic cylinder, and an electromagnetic vibrator. Two vibratory motors 5 are radially symmetrically arranged inside the shell 4, and are positioned near the outer edge of the shell. The two motors operate synchronously to drive the shell 4 to vibrate radially relative to the sand extraction pipe 1. This compresses the coarse sand layer on the outer circumference of the shell 4, destroying the sand skeleton structure within it. Simultaneously, as the shell 4 vibrates radially left and right, it alternately creates sand and gravel drop gaps on the left or right side. After the sand skeleton is destroyed, the resulting fluid sand and gravel can quickly flow downwards and inwards under gravity to below the inlet end of the sand extraction pipe 1. Figure 1 As shown, this facilitates the smooth progress of the sand dredging process.

[0040] The cylinder body of the hydraulic cylinder 6 is fixed to the outer wall of the sand extraction pipe 1 and waterproofed. The piston rod of the hydraulic cylinder 6 extends into the vibratory impact housing 4 and is flexibly connected to the inner bottom surface of the vibratory impact housing 4. In this embodiment, the end of the piston rod is connected to the inner bottom surface of the vibratory impact housing 4 through a rubber disc or spring. In addition, the piston rod of the hydraulic cylinder 6 is located close to the sand extraction pipe 1. When the piston rod moves up and down, it drives the vibratory impact housing 4 to swing up and down relative to the sand extraction pipe 1. This can squeeze the coarse sand layer falling to the top of the vibratory impact housing 4 and destroy its sand skeleton. Specifically, the vibratory impact housing 4 falls rapidly, and the coarse sand layer at the top of the vibratory impact housing 4 falls with a delay and collides with the vibratory impact housing as it resets upward. This can quickly destroy its sand skeleton, causing it to loosen and flow to the coarse sand liquefaction zone. Figure 1 As shown, this is beneficial for further improving sand extraction efficiency, effectively expanding the influence area of ​​the vibration of the vibratory casing 4, and increasing the destructive strength to the sand skeleton. In other embodiments of the present invention, the hydraulic cylinder 6 can be replaced by a fourth vibration motor. There are two fourth vibration motors located inside the vibratory casing 4. The two fourth vibration motors are arranged vertically near the central axis of the vibratory casing 4 and can drive the vibratory casing 4 to vibrate vertically relative to the sand extraction pipe 1.

[0041] like Figures 4-6As shown, the electromagnetic vibrator 7 is disposed inside the vibratory casing 4. The electromagnetic vibrator 7 includes two brushes 71, two current contactors 72, two arc-shaped magnetic strips 73, a metal circuit 74, and a non-uniform mass disk 76. The non-uniform mass disk 76 is crescent-shaped, and the bottom end of the metal circuit 74 is connected to the non-uniform mass disk 76 through a connecting axis 75. The non-uniform mass disk 76 is fixed on the inner bottom surface of the vibratory casing 4. The two current contactors 72 are evenly arranged circumferentially. The two metal circuits 74 are two conductive metal rods, and the two ends of each metal circuit 74 are respectively connected to the two radially symmetrical current contactors 72 and support the two current contactors 72 upwards. The bottom end of the metal circuit 74 is connected to the non-uniform mass disk 76, and the non-uniform mass disk 76 is fixed on the inner bottom surface of the vibratory casing 4. The two brushes 71 are radially symmetrical and fixedly arranged. The two brushes 71 are respectively connected to the first ends of the two first mounting brackets 77, and the second ends of the first mounting brackets 77 are... The first mounting bracket 77 is fixedly connected to the sand extraction pipe 1 through a long hole in the inner wall of the hollow cavity. Furthermore, the first end of the first mounting bracket 77 is connected to the brush 71 via a spring. Under the action of the spring, the brush is in contact with the outer wall of the current contactor 72. The two brushes 71 can be connected to the two ends of an AC power supply respectively. Two arc-shaped magnetic strips 73 are symmetrically fixedly arranged, with the S pole and N pole respectively. Similarly, the two arc-shaped magnetic strips 73 are connected to the first ends of the two second mounting brackets respectively. The second end of the second mounting bracket is fixedly connected to the sand extraction pipe 1 through a long hole in the inner wall of the hollow cavity. Thus, when the brush is connected to AC power, it can drive the vibratory housing 4 to rotate alternately in roughly forward and reverse directions. Figure 5 and 6 As shown, under the action of the uneven mass disc, the bottom of the vibratory casing will sway left and right at the same time. This can loosen the surrounding gravel on the one hand, and make the vibratory motor 5 and the fourth hydraulic cylinder 6 act more evenly on the surrounding sand skeleton on the other hand. This allows the vibratory casing 4 to uniformly and densely squeeze the surrounding sand skeleton, which can effectively destroy the coarse sand skeleton and further improve the sand extraction efficiency.

[0042] A method for vibratory extraction of coarse sand from the nearshore seabed, employing the vibratory extraction device for coarse sand from the nearshore seabed as described above, includes the following steps:

[0043] a. Before the inlet end of the sand dredging pipe 1 contacts the seabed silt layer, turn on the vibrating motor and the sand dredging pump. The sand dredging pump first forms a cavity below the inlet end of the sand dredging pipe 1, while the vibrating motor squeezes the surrounding coarse sand layer.

[0044] b. When the inlet of flush pipe 2 is located below sea level, turn on water pump 3;

[0045] c. When the sand extraction pipe 1 descends to the set depth, the hydraulic cylinder 6 and the electromagnetic vibrator 7 are activated. The hydraulic cylinder 6 and the electromagnetic vibrator can work alternately to drive the vibratory casing 4 to vibrate up and down and rotate in both directions. This helps to form a coarse sand liquefaction zone below the inlet end of the sand extraction pipe 1, ensuring that the coarse sand at the inlet end of the sand extraction pipe 1 is in a liquefied state that is easily extracted. Figure 1 As shown;

[0046] d. Connect the two brushes 71 to AC power, such as Figure 3 and 4 As shown, when the current flows from right to left, it passes through brush 71, current contactor 72, metal circuit 73, and brush 71 to form a closed current loop. The metal circuit 73 generates an electromagnetic field due to the energized conductor. Based on the principle of like poles repelling and unlike poles attracting, the metal circuit 73 will rotate in the forward direction, simultaneously driving the non-uniform mass disk 76 and the vibrating housing 4 to rotate in the forward direction. After rotating to a certain angle, brush 71 switches to another set of current contactors 72, and the current flows from left to right, thereby driving the non-uniform mass disk 76 and the vibrating housing 4 to rotate in the opposite direction. This allows the vibrating housing 4 to rotate alternately in the forward and reverse directions. At the same time, under the action of the non-uniform mass disk 76, the bottom of the vibrating housing 4 will shake.

[0047] e. After sand dredging is completed, shut down the sand dredging pump, vibrating motor 5, water pump 3, and hydraulic cylinder 6.

[0048] The present invention has been described above by way of example, but the present invention is not limited to the specific embodiments described above. Any modifications or variations made based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A vibratory extraction device for coarse sand from the nearshore seabed, characterized in that, The device includes a sand dredging pipe (1), a flushing device, and a vibration device. The sand dredging pipe (1) is equipped with a sand dredging pump and includes an inlet end and an outlet end. The inlet end can extend into the coarse sand layer, and the outlet end is connected to the sand storage box of the sand transport ship on the sea surface. The flushing device includes a flushing pipe (2). The flushing pipe (2) includes an inlet that can be set in the seawater layer and an outlet that is set upward close to the inlet end of the sand dredging pipe (1). The flushing pipe (2) is equipped with a water pump (3) to discharge seawater under pressure through the outlet. The vibration device includes a vibratory shell (4) that is set downward close to the outlet end and is cone-shaped with a smaller top and a larger bottom. The vibratory shell (4) is movably wrapped around the sand dredging pipe (1) and has a drive unit inside. The drive unit can drive the vibratory shell (4) to vibrate to loosen the nearby compacted coarse sand. The drive unit also includes a hydraulic cylinder (6) fixed to the sand extraction pipe (1). The piston rod of the hydraulic cylinder (6) extends into the vibratory housing (4) and is connected to the vibratory housing (4) to drive the vibratory housing (4) to swing up and down relative to the sand extraction pipe (1). The drive unit also includes an electromagnetic vibrator (7) disposed in the vibratory housing (4). The piston rod of the hydraulic cylinder (6) is connected to the vibratory housing (4) by a flexible material. The electromagnetic vibrator (7) includes two brushes (71), two current contactors (72), two arc-shaped magnetic strips (73), a metal circuit (74), and a non-uniform mass disk (76). The two current contactors (72) are evenly arranged circumferentially. The two ends of the metal circuit (74) are respectively connected to the two radially symmetrical current contactors (72), and the bottom end of the metal circuit (74) is connected to the non-uniform mass disk (76). The non-uniform mass disk (76) is fixed on the inner bottom surface of the vibratory housing (4). The two brushes (71) are fixedly arranged radially symmetrically, and the brushes (71) can contact the current contactors (72). The two brushes (71) can be connected to the two ends of the AC power supply respectively. The two arc-shaped magnetic strips (73) are fixedly arranged symmetrically and are respectively the S pole and the N pole.

2. The nearshore seabed coarse sand vibratory extraction device according to claim 1, characterized in that, The flushing pipe (2) consists of an upper section, a middle section and a lower section from top to bottom. The middle section is located inside the sand dredging pipe (1) and fixed to the inner wall of the sand dredging pipe (1). The water pump (3) is located on the middle section. The middle section passes through the side wall of the sand dredging pipe (1) and communicates with the upper section. The middle section passes through the side wall of the sand dredging pipe (1) and communicates with the lower section.

3. The nearshore seabed coarse sand vibration extraction device according to claim 2, characterized in that, The outlet of the flushing pipe (2) is connected to a jet nozzle, and the outlet of the jet nozzle is inclined downward and faces the central axis of the sand pumping pipe (1).

4. The nearshore seabed coarse sand vibratory extraction device according to claim 1, characterized in that, The vibratory shell (4) includes a through hollow cavity. The sand extraction pipe (1) passes through the hollow cavity and is connected to the inner wall of the hollow cavity through several radially arranged elastic elements. Flexible rubber pads are also provided at the upper and lower ports of the hollow cavity. The flexible rubber pads seal the hollow cavity. The vibratory shell (4) is conical and has a taper of 1 to 4.

5. The nearshore seabed coarse sand vibratory extraction device according to any one of claims 1 to 4, characterized in that, The driving unit includes two vibration motors (5) disposed in the vibratory casing (4). The two vibration motors (5) are radially symmetrically disposed in the vibratory casing (4) and can drive the vibratory casing (4) to vibrate radially relative to the sand extraction pipe (1).

6. The nearshore seabed coarse sand vibration extraction device according to claim 5, characterized in that, The non-uniform mass disk (76) is crescent-shaped, and the bottom end of the metal circuit (74) is in contact with the non-uniform mass disk (76) through a connecting axis.

7. The nearshore seabed coarse sand vibration extraction device according to claim 5, characterized in that, The electromagnetic vibrator (7) and the hydraulic cylinder (6) work alternately.

8. A method for vibratory extraction of coarse sand from the nearshore seabed, characterized in that, The nearshore seabed coarse sand vibratory extraction device as described in claim 6 or 7 includes the following steps: a. Before the inlet end of the sand dredging pipe (1) contacts the seabed silt layer, turn on the vibrating motor (5) and the sand dredging pump; b. When the inlet of the flushing pipe is located below sea level, turn on the water pump (3). c. When the sand dredging pipe (1) is lowered to the set depth, the hydraulic cylinder (6) is turned on to drive the vibratory housing (4) to vibrate up and down, so that the coarse sand at the inlet end of the sand dredging pipe (1) is in a liquefied state that is easy to be extracted, and the sand dredging pump is turned on to start dredging. d. After sand dredging is completed, shut down the sand dredging pump, vibrating motor (5), water pump (3), and hydraulic cylinder (6).

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