An in-situ shear wave transmitting transducer for seafloor sediments

Abstract

The present invention discloses an in-situ shear wave transmitting transducer for seabed sediments. The in-situ shear wave transmitting transducer for seabed sediments comprises a stainless steel housing, a protective cover, a prestressed pressure plate, an upper insulating sheet, a piezoelectric ceramic sheet, a lower insulating sheet, a beryllium bronze vibrator and a wire. The present invention makes it easy to penetrate the seabed sediments through the appearance design of the protective cover and the stainless steel housing without drilling holes; and the shear wave transducer is connected to the signal transmitting module through a wire, which is convenient for controlling the signal on the deck to generate a stable and controllable signal source; the present invention applies prestress to the piezoelectric ceramic sheet through the prestressed pressure plate, thereby increasing the strain capacity and strength of the piezoelectric ceramic sheet, making it more resistant to impact; the present invention utilizes the high-strength elasticity of the beryllium bronze material to transfer the strain of the piezoelectric ceramic sheet to the beryllium bronze vibrator, thereby improving the conversion efficiency of the shear wave.

Description

Technical Field

[0001] The invention relates to the technical field of in-situ measurement of shear wave velocity of seabed sediments, and in particular to an in-situ shear wave transmitting transducer for seabed sediments. Background Art

[0002] The shear wave velocity of seabed sediments is an important parameter that reflects their shear wave propagation capacity and dynamic characteristics. It has been widely used in marine engineering practice and is clearly stated in current specifications. At present, the main method for obtaining shear wave velocity of seabed sediment samples is to measure the shear wave velocity of seabed sediment samples in the laboratory. In-situ measurement can effectively avoid measurement errors caused by disturbances to sediments caused by sampling and transportation, and has higher precision and accuracy than laboratory measurements of sediment samples.

[0003] At present, the methods used for on-site testing of shear wave velocity mainly include single-hole hanging logging method, single-hole layer inspection method, cross-hole method, transient surface wave method, steady-state surface wave method and seismic while drilling method, etc. However, in marine engineering construction, most of the above methods cannot be implemented normally and smoothly, such as: the single-hole layer inspection method cannot excite the source on the seabed; the cross-hole method requires more boreholes and deeper boreholes to complete, the cost is high, and it cannot be implemented on marine strata; both transient and steady-state surface wave methods require surface excitation and surface reception of the source, and the seismic while drilling method requires in-hole excitation of the source and wave velocity reception on the surface, and the test cannot be carried out on the seabed; the single-hole hanging method does not require surface excitation and is generally suitable for underwater operations, but it depends on the drilling of the borehole and the test is carried out point by point from the bottom of the hole to the hole mouth. In offshore strata, due to the thick marine sedimentary soft soil under the seabed, the hole wall is not stable for a long time and the borehole is prone to collapse. In addition, some engineers have developed a method of using casing to protect the wall for shear wave testing, which not only wastes manpower, financial resources and time, but also causes jumps and mutations in the test data because the shear wave velocity receiving device often touches the casing in the borehole, making it impossible to guarantee the formation test quality and the accuracy of the test data.

[0004] It can be seen that the current methods of on-site testing of shear wave velocity are either limited by the fact that the seismic system cannot be implemented on the seabed, or are limited by drilling, resulting in high in-situ measurement costs or inability to guarantee the quality of test data. Summary of the invention

[0005] The purpose of the present invention is to provide an in-situ shear wave transmitting transducer for seabed sediments to solve the problem that the current method of on-site testing of shear wave velocity is either restricted by the excitation system and cannot be implemented on the seabed, or is restricted by drilling, resulting in high in-situ measurement costs or inability to guarantee the quality of test data.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A seabed sediment in-situ shear wave transmitting transducer, comprising: a stainless steel housing, a protective cover, a prestressed pressure plate, an upper insulating sheet, a piezoelectric ceramic sheet, a lower insulating sheet, a beryllium bronze vibrating sheet and a conductor;

[0008] The protective cover has a cavity structure inside; the prestressed pressure plate, the upper insulating sheet, the piezoelectric ceramic sheet, the lower insulating sheet and the beryllium bronze vibrating sheet are all located in the cavity structure; the stainless steel shell covers the outer edge of the protective cover;

[0009] The upper part of the cavity structure has a first step structure and a second step structure; a lower positioning slot is provided at the bottom of the cavity structure; the upper insulating sheet, the piezoelectric ceramic sheet and the lower insulating sheet are stacked in sequence from top to bottom on top of the second step structure; the prestressed pressure plate is placed on top of the first step structure; the lower surface of the prestressed pressure plate is in contact with the upper surface of the upper insulating sheet; an upper positioning slot is provided at the bottom of the lower insulating sheet; the top of the beryllium bronze vibrator is fixed in the upper positioning slot; the bottom of the beryllium bronze vibrator is fixed in the lower positioning slot; one end of the wire is connected to the piezoelectric ceramic sheet, and the other end of the wire is connected to the signal transmitting module outside the seabed sediment in-situ shear wave transmitting transducer.

[0010] Optionally, two ends of the prestressed pressure plate are respectively fixed to the first step structure by prestressed screws.

[0011] Optionally, epoxy resin is poured into the cavity structure.

[0012] Optionally, the piezoelectric ceramic sheet and the beryllium bronze vibrating plate are arranged perpendicularly; and expansion and contraction of the piezoelectric ceramic sheet in a thickness direction causes bending and deformation of the beryllium bronze vibrating plate.

[0013] Optionally, the seabed sediment in-situ shear wave transmitting transducer also includes a connecting rod; the bottom of the connecting rod is fixedly connected to the top of the stainless steel shell; the other end of the wire passes through the epoxy resin and the connecting rod and is connected to the signal transmitting module outside the seabed sediment in-situ shear wave transmitting transducer.

[0014] Optionally, the protective cover is a polygonal polyurethane plate; the upper part of the protective cover is a rectangular structure, and the bottom part is a triangular structure.

[0015] Optionally, the piezoelectric ceramic piece and the beryllium bronze vibrating piece are located at the center of the rectangular structure on the upper part of the protective cover.

[0016] Optionally, the length of the protective cover is greater than twice the length of the beryllium copper vibrating piece; the width of the protective cover is greater than twice the width of the beryllium copper vibrating piece.

[0017] Optionally, the stainless steel shell is an annular structure; the shape of the inner ring of the annular structure matches the shape of the outer edge of the protective cover.

[0018] Optionally, the outer ring of the stainless steel housing has a conical chamfer.

[0019] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0020] The present invention provides an in-situ shear wave transmitting transducer for seabed sediments, which comprises a stainless steel housing, a protective cover, a prestressed pressure plate, an upper insulating sheet, a piezoelectric ceramic sheet, a lower insulating sheet, a beryllium bronze vibrator and a wire. The present invention makes it easy to penetrate the seabed sediments through the appearance design of the protective cover and the stainless steel housing, without drilling holes; and the shear wave transducer is connected to the signal transmitting module through a wire, which is convenient for controlling the signal on the deck to generate a stable and controllable signal source; the present invention applies prestress to the piezoelectric ceramic sheet through the prestressed pressure plate, thereby increasing the strain capacity and strength of the piezoelectric ceramic sheet, making it more resistant to impact; the present invention utilizes the high-strength elasticity of the beryllium bronze material to transfer the strain of the piezoelectric ceramic sheet to the beryllium bronze vibrator, thereby improving the conversion efficiency of the shear wave. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained according to the drawings provided by the present invention without paying creative labor.

[0022] Figure 1 A three-dimensional axonometric diagram of the in-situ shear wave transmitting transducer for seafloor sediments provided by the present invention;

[0023] Figure 2 A front view of the in-situ shear wave transmitting transducer for seabed sediments provided by the present invention;

[0024] Figure 3 A front cross-sectional view of each element in the internal cavity structure of the protective cover provided by the present invention;

[0025] Figure 4 A partial enlarged view of the prestressed system provided by the present invention;

[0026] Figure 5 A left side cross-sectional view of each element in the internal cavity structure of the protective cover provided by the present invention;

[0027] Figure 6It is an enlarged view of the top structure of the left side section of each element in the internal cavity structure of the protective cover provided by the present invention;

[0028] Figure 7 It is an enlarged diagram of the bottom structure of the left side section of each element in the internal cavity structure of the protective cover provided by the present invention;

[0029] Figure 8 A schematic diagram of the structure of the stainless steel housing provided by the present invention;

[0030] Fig. 9 A schematic diagram of the vibration of the piezoelectric ceramic piece and the beryllium bronze vibrating piece provided by the present invention;

[0031] The numbers in the figure are: 1. connecting rod; 2. stainless steel shell; 3. piezoelectric ceramic plate; 4. prestressed screw; 5. beryllium bronze vibrator; 6. protective cover; 7. upper insulating plate; 8. lower insulating plate; 9. epoxy resin; 10. prestressed pressure plate; 11. wire; 12. upper positioning slot; 13. lower positioning slot; 14. first step structure; 15. second step structure. DETAILED DESCRIPTION

[0032] 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.

[0033] The purpose of the present invention is to provide an in-situ shear wave transmitting transducer for seabed sediments to solve the problem that the current method of on-site testing of shear wave velocity is either restricted by the excitation system and cannot be implemented on the seabed, or is restricted by drilling, resulting in high in-situ measurement costs or inability to guarantee the quality of test data.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Figure 1 A three-dimensional axonometric diagram of the in-situ shear wave transmitting transducer for seafloor sediments provided by the present invention; Figure 2 A front view of the in-situ shear wave transmitting transducer for seabed sediments provided by the present invention; Figure 3 A front cross-sectional view of each element in the internal cavity structure of the protective cover provided by the present invention; Figure 4 A partial enlarged view of the prestressed system provided by the present invention; Figure 5 A left side cross-sectional view of each element in the internal cavity structure of the protective cover provided by the present invention; Figure 6It is an enlarged view of the top structure of the left side section of each element in the internal cavity structure of the protective cover provided by the present invention; Figure 7 This is an enlarged diagram of the bottom structure of the left side section of each component in the internal cavity structure of the protective cover provided by the present invention. Figure 1-7 The in-situ shear wave transmitting transducer for seabed sediments provided by the present invention comprises: a connecting rod 1, a stainless steel shell 2, a piezoelectric ceramic sheet 3, a prestressed screw 4, a beryllium bronze vibrator 5, a protective cover 6, an upper insulating sheet 7, a lower insulating sheet 8, an epoxy resin package 9, a prestressed pressure plate 10 and a wire 11.

[0036] The protective cover 6 has a cavity structure inside. The prestressed pressure plate 10, the upper insulating sheet 7, the piezoelectric ceramic sheet 3, the lower insulating sheet 8 and the beryllium bronze vibrating sheet 5 are all located in the cavity structure. The stainless steel shell 2 covers the outer edge of the protective cover 6. The bottom of the connecting rod 1 is fixedly connected to the top of the stainless steel shell 2.

[0037] like Figure 3 and Figure 4 As shown, the upper part of the cavity structure has a first step structure 14 and a second step structure 15. The prestressed plate 10 is located on the first step structure 14 of the protective cover 6, and the upper insulating sheet 7, the piezoelectric ceramic sheet 3, and the lower insulating sheet 8 are located on the second step structure 15 of the protective cover 6. Specifically, the upper insulating sheet 7, the piezoelectric ceramic sheet 3, and the lower insulating sheet 8 are stacked on the second step structure 15 from top to bottom. The prestressed plate 10 is placed on the first step structure 14. The prestressed screw 4 is connected to the prestressed plate 10 and the protective cover 6. Specifically, the two ends of the prestressed plate 10 are fixed to the first step structure 14 by the prestressed screw 4 respectively. The lower surface of the prestressed plate 10 contacts the upper surface of the upper insulating sheet 7. The upper surface of the piezoelectric ceramic sheet 3 is connected to the lower surface of the upper insulating sheet 7, the upper surface of the lower insulating sheet 8 is connected to the lower surface of the piezoelectric ceramic sheet 3, and the beryllium bronze vibrator 5 is connected to the lower insulating sheet 8. The prestressed screw 4 fixes the prestressed pressure plate 10 on the first step structure 14. The pressing force of the prestressed screw 4 is transmitted through the prestressed pressure plate 10 and the upper insulating sheet 7, so that the piezoelectric ceramic sheet 3 is pressed between the prestressed pressure plate 10 and the second step structure 15 and generates a certain prestress.

[0038] Among them, the lateral widths of the upper insulating sheet 7, the piezoelectric ceramic sheet 3 and the lower insulating sheet 8 are the same, and the width of the prestressed pressure plate 10 is greater than the width of the upper insulating sheet 7. Since there is a prestressed pressure plate 10 on the top of the upper insulating sheet 7, the prestressed pressure plate 10 is fixed to the first step structure 14 of the protective cover 6 by the prestressed screws 4, so that the piezoelectric ceramic sheet 3 and the beryllium bronze vibrator 5 generate a certain prestress. The prestress will increase the strain capacity of the piezoelectric ceramic sheet 3, enhance the strength of the piezoelectric ceramic sheet 3, and make it more resistant to impact. The piezoelectric ceramic sheet 3 is arranged vertically to the beryllium bronze vibrator 5 so that the strain of the piezoelectric ceramic sheet 3 can be effectively transmitted to the beryllium bronze vibrator 5. Due to the high strength elasticity of the beryllium bronze material, the conversion efficiency of the shear wave is improved.

[0039] Since an upper insulating sheet 7 and a lower insulating sheet 8 are respectively disposed on the top and the bottom of the piezoelectric ceramic sheet 3 , the piezoelectric ceramic sheet 3 can be insulated from the beryllium copper vibrating sheet 5 .

[0040] like Figure 5-7 As shown, a lower positioning slot 13 is provided at the bottom of the cavity structure; an upper positioning slot 12 is provided at the bottom of the lower insulating sheet 8. The top of the beryllium bronze vibrating piece 5 is fixed in the upper positioning slot 12; the bottom of the beryllium bronze vibrating piece 5 is fixed in the lower positioning slot 13. When the upper positioning slot 12 is provided, it is required that the upper positioning slot 12 does not penetrate the thickness direction of the lower insulating sheet 8, so as to ensure that the piezoelectric ceramic sheet 3 is insulated from the beryllium bronze vibrating piece 5.

[0041] Since an upper positioning slot 12 is designed at the bottom of the lower insulating sheet 8 and a lower positioning slot 13 is designed at the bottom of the cavity structure, the lower end of the beryllium copper sheet 5 can be embedded in the lower positioning slot 13 and the upper end of the beryllium copper vibrator 5 can be embedded in the upper positioning slot 12 to provide positioning for the beryllium copper vibrator 5.

[0042] The bottom end of the beryllium bronze vibrator 5 is inserted into the lower positioning slot 13 of the protective cover 6, and the top end of the beryllium bronze vibrator 5 is inserted into the upper positioning slot 12 at the bottom end of the lower insulating sheet 8; when the prestressed screw 4 fixes the prestressed pressure plate 10, the upper insulating sheet 7, the piezoelectric ceramic sheet 3, and the lower insulating sheet 8 on the first step structure 14 and the second step structure 15 of the protective cover 6, the beryllium bronze vibrator 5 is also fixed in the upper positioning slot 12 and the lower positioning slot 13; when the prestressed screw 4 causes the piezoelectric ceramic sheet 3 to generate prestress, the beryllium bronze vibrator 5 also generates a certain amount of prestress.

[0043] One end of the wire 11 is connected to the piezoelectric ceramic sheet 3 , and the other end of the wire 11 is connected to a signal transmitting module outside the seabed sediment in-situ shear wave transmitting transducer.

[0044] The protective cover 6 is made of polyurethane material. The cavity structure of the protective cover 6 is filled with epoxy resin 9 to provide a watertight package for the piezoelectric ceramic sheet 3. The epoxy resin 9 and the polyurethane protective cover 6 are both excellent sound wave transmission media, ensuring the sound transmission performance of the transducer.

[0045] The prestressed screw 4, prestressed pressure plate 10, upper insulating sheet 7, piezoelectric ceramic sheet 3, lower insulating sheet 8, and beryllium bronze vibrator 5 are installed in the protective cover 6. Epoxy resin 9 is poured between the protective cover 6 and the prestressed screw 4, prestressed pressure plate 10, upper insulating sheet 7, piezoelectric ceramic sheet 3, lower insulating sheet 8, and beryllium bronze vibrator 5 to form an epoxy resin package. The protective cover 6 is made of polyurethane material. The protective cover 6 and the epoxy resin package play a role in fixing and positioning the piezoelectric ceramic sheet 3 and the beryllium bronze vibrator 5, so that the vibration of the piezoelectric ceramic sheet 3 can be stably transmitted to the beryllium bronze vibrator 5, and the beryllium bronze vibrator 5 can generate sound waves with stable period and amplitude. The epoxy resin material and the polyurethane material of the protective cover 6 have good sound transmission performance, which can meet the sensitivity and directionality requirements of the transducer during in-situ measurement.

[0046] The protective cover 6 is fixed in the stainless steel shell 2, and the connecting rod 1 is fixed on the top of the stainless steel shell 2. One end of the wire 11 is connected to the piezoelectric ceramic sheet 3, and the other end of the wire 11 passes through the epoxy resin 9 and the connecting rod 1, and is connected to the signal transmitting module outside the seabed sediment in-situ shear wave transmitting transducer. The signal transmitting module provides an electrical signal to the piezoelectric ceramic sheet 3, and can set parameters such as the voltage amplitude and the transmitting frequency, and finally realizes the transmission of the shear wave signal through the transmitting transducer structure of the present invention.

[0047] Preferably, the protective cover 6 is a polygonal polyurethane plate. The upper part of the protective cover 6 is a rectangular structure, and the bottom is a triangular structure. The protective cover 6 has a cavity inside for placing components such as the piezoelectric ceramic sheet 3, the beryllium bronze vibrating sheet 5, the prestressed pressure plate 10, the prestressed screw 4, the upper insulating sheet 7, the lower insulating sheet 8, the epoxy resin package 9, and the wire 11. Preferably, as Figure 2 As shown, the piezoelectric ceramic piece 3 and the beryllium copper vibrating piece 5 are located at the center of the rectangular structure on the upper part of the protective cover 6, so that they produce the same deformation in all directions.

[0048] Preferably, the length of the protective cover 6 is greater than twice the length of the beryllium copper vibrating plate 5; the width of the protective cover 6 is greater than twice the width of the beryllium copper vibrating plate 5. In the figure, the horizontal direction is the width direction, and the vertical direction is the length direction. Since the side length of the protective cover 6 is greater than twice the side length of the beryllium copper vibrating plate 5, the beryllium copper vibrating plate 5 can be less restricted by the protective cover 6, so that it can be deformed freely to ensure that the sound wave has sufficient power.

[0049] Figure 8 This is a schematic diagram of the structure of the stainless steel housing provided by the present invention. Figure 8 As shown, the stainless steel shell 2 is an annular structure, which means that the stainless steel shell 2 is annular, and the middle part is empty, so it only covers the outer edge of the protective cover 6. Figure 1 and 2 As shown, the stainless steel shell 2 is coated on the outer edge of the protective cover 6, and the inner ring shape of the annular structure matches the shape of the outer edge of the protective cover 6. Since the piezoelectric ceramic piece 3 and the beryllium bronze vibrator 5 are located in the center of the protective cover 6, they produce the same amount of deformation in all directions; the stainless steel shell 2 is annular, so there is no metal coating at the position of the beryllium bronze vibrator 5 to avoid sound wave attenuation. The above transducer structure and size design can effectively reduce the attenuation of sound waves and improve the reliability of measurement.

[0050] like Figure 1 and Figure 8 As shown, the periphery of the stainless steel shell 2 is designed with a conical chamfer, which can reduce the penetration force of the transducer when it is inserted into the sediment. Specifically, the outer ring (outer end edge) of the stainless steel shell 2 has a circle of conical chamfers along the circumferential direction, so that the penetration force of the transducer when it is inserted into the sediment can be reduced.

[0051] Of course, the shapes of the stainless steel shell 2 and the protective cover 6 are not limited to the above shapes, as long as their shapes are conducive to penetration into the seabed sediments.

[0052] Fig. 9 The vibration diagram of the piezoelectric ceramic sheet and the beryllium bronze vibrating plate provided by the present invention is shown in FIG. Fig. 9 As shown, in the seabed sediment in-situ shear wave transmitting transducer of the present invention, the piezoelectric ceramic sheet 3 is polarized along the thickness direction (vertical direction in the figure), and the expansion and contraction of the piezoelectric ceramic sheet 3 in the thickness direction causes the beryllium bronze vibrator 5 thereunder to bend and deform, and the bending vibration of the beryllium bronze vibrator 5 causes the transducer to generate shear waves of a specific frequency.

[0053] When the piezoelectric ceramic sheet 3 is subjected to positive and negative voltages, tensile and compressive deformations occur, and the beryllium copper vibrating piece 5 is subjected to the pressure of the piezoelectric ceramic sheet 3 and produces periodic bending deformation, thereby generating periodic sound waves with stable amplitude.

[0054] The in-situ shear wave transmitting transducer for seabed sediments of the present invention can be used to realize in-situ measurement of shear wave characteristics of seabed sediments. The in-situ shear wave transmitting transducer for seabed sediments of the present invention can be connected to the in-situ measurement device for acoustic characteristics of seabed sediments through a connecting rod 1, penetrate into the seabed sediments under the action of gravity or with the help of external force, and together with the shear wave receiving transducer, conveniently and efficiently realize the measurement of shear wave characteristics of seabed sediments.

[0055] The in-situ shear wave transmitting transducer for seabed sediments (referred to as transducer, shear wave transducer or shear wave transmitting transducer) of the present invention uses epoxy resin 9 to watertightly package the shear wave transmitting transducer components, and through the shape design of the protective cover 6 and the stainless steel shell 2, the shear wave transmitting transducer can and is easy to penetrate into the seabed sediments without drilling; and the shear wave transducer is connected to the signal transmitting module through a wire 11, which is convenient for controlling the signal on the deck to generate a stable and controllable signal source. The in-situ shear wave transmitting transducer for seabed sediments of the present invention also applies prestress to the piezoelectric ceramic sheet 3 through a prestress system (including a prestressed pressure plate 10, a prestressed screw 4, an upper insulating plate 7, a lower insulating plate 8 and a protective cover cavity structure), thereby increasing the strain capacity of the piezoelectric ceramic sheet 3, enhancing the strength of the piezoelectric ceramic sheet 3, and making it more resistant to impact; the present invention also uses the high-strength elasticity of the beryllium bronze material to transmit the strain of the piezoelectric ceramic sheet 3 to the beryllium bronze vibrator 5, thereby improving the conversion efficiency of the shear wave.

[0056] The structural design of the seabed sediment in-situ shear wave transmitting transducer of the present invention makes it neither restricted by the excitation system nor the drilling, so in-situ measurement can be carried out on the seabed, reducing the in-situ measurement cost and improving the formation test quality and the accuracy of the test data.

[0057] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

[0058] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the device and its core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An in-situ shear wave transmitting transducer for seafloor sediments, characterized in that: The seabed sediment in-situ shear wave transmitting transducer comprises: a stainless steel housing, a protective cover, a prestressed pressure plate, an upper insulating sheet, a piezoelectric ceramic sheet, a lower insulating sheet, a beryllium bronze vibrating sheet and a conductor; The protective cover has a cavity structure inside; the prestressed pressure plate, the upper insulating sheet, the piezoelectric ceramic sheet, the lower insulating sheet and the beryllium bronze vibrating sheet are all located in the cavity structure; the stainless steel shell covers the outer edge of the protective cover; The upper part of the cavity structure has a first step structure and a second step structure; a lower positioning slot is provided at the bottom of the cavity structure; the upper insulating sheet, the piezoelectric ceramic sheet and the lower insulating sheet are stacked in sequence from top to bottom on top of the second step structure; the prestressed pressure plate is placed on top of the first step structure; the lower surface of the prestressed pressure plate contacts the upper surface of the upper insulating sheet; an upper positioning slot is provided at the bottom of the lower insulating sheet; the top of the beryllium bronze vibrator is fixed in the upper positioning slot; the bottom of the beryllium bronze vibrator is fixed in the lower positioning slot; one end of the wire is connected to the piezoelectric ceramic sheet, and the other end of the wire is connected to the signal transmitting module outside the seabed sediment in-situ shear wave transmitting transducer; the two ends of the prestressed pressure plate are respectively fixed to the first step structure by prestressed screws; the piezoelectric ceramic sheet is vertically arranged to the beryllium bronze vibrator; the expansion and contraction of the piezoelectric ceramic sheet in the thickness direction causes the beryllium bronze vibrator to bend and deform.

2. The seabed sediment in-situ shear wave transmitting transducer according to claim 1, characterized in that: The cavity structure is filled with epoxy resin.

3. The seabed sediment in-situ shear wave transmitting transducer according to claim 2, characterized in that: The seabed sediment in-situ shear wave transmitting transducer also includes a connecting rod; the bottom of the connecting rod is fixedly connected to the top of the stainless steel shell; the other end of the wire passes through the epoxy resin and the connecting rod and is connected to the signal transmitting module outside the seabed sediment in-situ shear wave transmitting transducer.

4. The seabed sediment in-situ shear wave transmitting transducer according to claim 1, characterized in that: The protective cover is a polygonal polyurethane plate; the upper part of the protective cover is a rectangular structure, and the bottom part is a triangular structure.

5. The seabed sediment in-situ shear wave transmitting transducer according to claim 4, characterized in that: The piezoelectric ceramic piece and the beryllium copper vibrating piece are located at the center of the rectangular structure on the upper part of the protective cover.

6. The seabed sediment in-situ shear wave transmitting transducer according to claim 5, characterized in that: The length of the protective cover is greater than twice the length of the beryllium copper vibrating piece; the width of the protective cover is greater than twice the width of the beryllium copper vibrating piece.

7. The seabed sediment in-situ shear wave transmitting transducer according to claim 4, characterized in that: The stainless steel shell is an annular structure; the shape of the inner ring of the annular structure matches the shape of the outer edge of the protective cover.

8. The seabed sediment in-situ shear wave transmitting transducer according to claim 7, characterized in that: The outer ring of the stainless steel housing has a conical chamfer.

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