Low-frequency underwater acoustic transducer with double-opposite-shore signal excitation function and method

Abstract

The invention belongs to the field of underwater acoustic transducers, and particularly relates to a low-frequency underwater acoustic transducer with a double-opposite-shore signal excitation function and a method, the low-frequency underwater acoustic transducer comprises a transducer body, the top end of the transducer body is fixedly connected with a wire, the wire is fixedly connected with a fixing ring, the fixing ring is fixedly connected with a fixing plate, and the fixing plate is fixedly connected with the transducer body. The fixing plate is fixedly connected to the top end of the fixing shell, four sets of connecting springs are fixedly connected to the inner wall of the fixing shell, the bottom ends of the connecting springs are fixedly connected with the inner wall of a circular groove, the circular groove is formed in the top end of the transducer body, and a shielding mechanism is arranged below the transducer body. Through the structural design of the shielding mechanism, the function of shielding the bottom end of the transducer body is achieved, so that when the transducer body is placed underwater, sundries on the water surface cannot be attached to the transducer body, and when the transducer body needs to work, the baffle can be opened to prevent the transducer body from being shielded.

Description

Technical Field

[0001] The invention relates to the field of underwater acoustic transducers, in particular to a low-frequency underwater acoustic transducer with dual opposite-shore signal excitation function and a method thereof. Background Art

[0002] Low-frequency hydroacoustic transducer is a key device used in underwater acoustic systems. Dual opposite shore signal excitation, as an excitation method of low-frequency hydroacoustic transducer, can stimulate the transducer to produce more complex and efficient vibration modes, thereby improving the performance and use effect of the transducer.

[0003] The piezoelectric actuator and low-frequency underwater acoustic transducer proposed in patent document CN201610798548.4 include a first connector, a second connector and a first group of piezoelectric actuators, and the first group of piezoelectric actuators includes a plurality of first piezoelectric material columns. One end of the first voltage material column matches the first groove located in the first connector, and the other end of the first voltage material column matches the second groove located in the second connector. The contraction or extension of the plurality of first piezoelectric material columns can drive the displacement of the first connector and the second connector. Through appropriate voltage excitation, the longitudinal oscillation displacement of the piezoelectric material can be superimposed and increased, so the power generation capacity of the low-frequency underwater acoustic transducer driven by the piezoelectric actuator is increased. The piezoelectric actuator and low-frequency underwater acoustic transducer provided by the embodiment of the invention improve the problem of limited generation capacity of the existing low-frequency underwater acoustic transducer.

[0004] However, when the low-frequency underwater acoustic transducer in the above technology is used for detection in areas with poor water quality, debris floating on the water surface may adhere to the transducer during the process of being placed underwater, causing the propagation path of the sound waves to be obstructed during the operation of the transducer, thereby interfering with the normal operation of the transducer; therefore, in order to solve the above problem, a low-frequency underwater acoustic transducer and method with dual opposite-shore signal excitation function are proposed. Summary of the invention

[0005] In order to solve the problem that when the low-frequency underwater acoustic transducer in the above-mentioned technology is used for detection in areas with poor water quality, the debris floating on the water surface may adhere to the transducer during the process of being placed underwater, resulting in the propagation path of the sound waves being obstructed during the operation of the transducer, thereby interfering with the normal operation of the transducer, the present invention proposes a low-frequency underwater acoustic transducer and method with dual opposite-shore signal excitation function.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a low-frequency underwater acoustic transducer with a dual opposite-shore signal excitation function described in the present invention comprises a transducer body, a wire is fixedly connected to the top of the transducer body, a fixing ring is fixedly connected to the wire, the fixing ring is fixedly connected to a fixing plate, the fixing plate is fixedly connected to the top of a fixed shell, four groups of connecting springs are fixedly connected to the inner wall of the fixed shell, the bottom end of the connecting spring is fixedly connected to the inner wall of a circular groove, the circular groove is opened at the top of the transducer body, a shielding mechanism is arranged below the transducer body, the shielding mechanism is used to shield the bottom end of the transducer body to prevent debris from adhering to the bottom end of the transducer body, a moving mechanism is arranged inside the fixed shell, the moving mechanism is used to push the transducer body to move, so that the transducer body can extend a sufficient length from the inside of the fixed shell, and a fixing mechanism is arranged on the fixing plate, the fixing mechanism is used to fix the moving rod, so that the baffle can be in an open state when the transducer body is working.

[0007] Preferably, the shielding mechanism includes four groups of baffles, the four groups of baffles are in contact with each other, the baffles are rotatably connected to the bottom end of the movable shell, the bottom end of the baffle is fixedly connected with a rubber rope, the rubber rope is slidably connected to two groups of guide blocks, the guide blocks are fixedly connected to the fixed shell, the top end of the rubber rope is fixedly connected to the movable rod, the rubber rope is in a stretched state, the top end of the baffle is close to the bottom end of the transducer body, the inside of the baffle and the bottom end of the movable shell are fixedly connected with magnets, and the baffle is attracted to the bottom end of the movable shell.

[0008] The top end of the fixing block is fixedly connected to the fixing block, the fixing block is internally connected to the fixing block, the fixing block is internally connected to the fixing block, the fixing block is internally connected to the fixing block, the fixing block is internally connected to the fixing block, the fixing block is internally connected to the fixing block, the fixing block is internally connected to the fixing block, and the fixing block is internally connected to the fixing block.

[0009] Preferably, the fixing mechanism includes four groups of rectangular grooves, the rectangular grooves are opened on the fixing plate, the width of the rectangular grooves is slightly larger than the width of the moving rod, the inner wall of the rectangular groove is opened with a movable groove, the inner wall of the movable groove is fixedly connected with a fixing spring, the fixing spring is fixedly connected to the clamping block, the clamping block abuts against the moving rod, the moving rod is opened with a slot, the inside of the slot is rotatably connected to the plug rod.

[0010] Preferably, a pad is fixedly connected to one side of the connecting rod close to the transducer body, and the pad is in close contact with the transducer body.

[0011] Preferably, a circular hole is provided on the inner wall of the storage groove near the top, and the circular holes are provided in multiple groups.

[0012] Preferably, the moving rod is designed to be L-shaped, the bottom end of the moving rod is fitted with the top end of the fixed shell, the top end of the moving rod is fixedly connected to a circular ring, and a handle is fixedly connected to the top end of the circular ring.

[0013] Preferably, the top end of the insertion rod passes through the circular ring, and the bottom end of the circular ring fits with the top end of the fixing plate.

[0014] A method for using a low-frequency underwater acoustic transducer with a dual opposite-shore signal excitation function, the method comprising the following steps:

[0015] S1. After connecting the wire to the power amplifier, place the transducer body together with the fixed shell into the water;

[0016] S2. Pull the four groups of moving rods upwards. The moving rods pull the rubber ropes. The bottom ends of the rubber ropes are fixed to the bottom ends of the baffles. Therefore, the baffles are pulled to rotate. The four groups of baffles are opened to expose the transducer body inside the fixed housing, so as to avoid the baffles blocking the transducer body during operation.

[0017] S3. When the slot on the moving rod is aligned with the card block, the card block will be inserted into the slot to fix the moving rod, and the baffle will remain in the open state. At this time, there is no need to continue pulling the moving rod.

[0018] The present invention is beneficial in that:

[0019] 1. The present invention realizes the function of shielding the bottom end of the transducer body through the structural design of the shielding mechanism, so that when the transducer body is placed underwater, debris on the water surface will not adhere to the transducer body, and when the transducer body needs to work, the baffle can be opened to avoid shielding the transducer body, which solves the problem that when the low-frequency underwater acoustic transducer in the prior art is used for detection in areas with poor water quality, when the transducer is placed underwater, the debris floating on the water surface may adhere to the transducer, resulting in the propagation path of the sound wave being obstructed during the operation of the transducer, thereby interfering with the normal operation of the transducer.

[0020] 2. Through the structural design of the moving mechanism of the present invention, during the process of opening the baffle, the moving shell can move upward, and the transducer body will be pushed downward, so that the transducer body can extend a sufficient length from the inside of the fixed shell, ensuring that the bottom end of the transducer body can be fully exposed, thereby reducing the interference of the fixed shell and the moving shell on the transducer body, so as to facilitate the normal operation of the transducer body.

[0021] 3. The present invention adopts the structural design of the fixing mechanism. When the moving rod is pulled upward to a certain position, the card block will be inserted into the slot, so that the position of the moving rod is fixed by the abutment between the inner wall of the slot and the card block, so that when the transducer body is working, the baffle can always remain in the open state, and when the moving rod needs to be reset, the card block and the slot can be released by simply rotating the insertion rod, making the operation process more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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 or the description of the prior art 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 based on these drawings without paying creative work.

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

[0024] Figure 2 It is a structural schematic diagram of the bottom of the present invention;

[0025] Figure 3 It is a structural schematic diagram of the transducer body of the present invention;

[0026] Figure 4 It is a schematic diagram of the cross-sectional structure of the present invention;

[0027] Figure 5 for Figure 4 A partial enlarged view of the middle A;

[0028] Figure 6 It is a schematic diagram of the connection structure of the mobile rod of the present invention;

[0029] Figure 7 It is a schematic diagram of the connection structure of the fixing block of the present invention;

[0030] Figure 8 It is a structural schematic diagram of the fixing mechanism of the present invention;

[0031] Fig. 9 It is a schematic diagram of the structure inside the moving rod of the present invention;

[0032] Fig.10 It is a flow chart of the present invention.

[0033] In the figure: 1, transducer body; 20, circular groove; 21, fixing ring; 22, wire; 23, fixed shell; 24, moving rod; 25, fixing block; 26, rubber rope; 27, guide block; 28, pad; 29, connecting rod; 30, connecting block; 31, baffle; 33, rotating rod; 34, slide groove; 35, moving shell; 36, storage groove; 37, circular hole; 38, notch; 39, connecting spring; 40, fixing plate; 43, rectangular groove; 44, movable groove; 45, fixing spring; 46, block; 47, circular ring; 48, plug rod; 49, slot; 50, slider; 51, bump. DETAILED DESCRIPTION

[0034] 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.

[0035] Embodiment 1

[0036] See also Figure 1 - Fig.10As shown, a low-frequency underwater acoustic transducer with a dual opposite-shore signal excitation function includes a transducer body 1, a wire 22 is fixedly connected to the top of the transducer body 1, a fixing ring 21 is fixedly connected to the wire 22, the fixing ring 21 is fixedly connected to a fixing plate 40, the fixing plate 40 is fixedly connected to the top of a fixing shell 23, four groups of connecting springs 39 are fixedly connected to the inner wall of the fixing shell 23, the bottom end of the connecting spring 39 is fixedly connected to the inner wall of a circular groove 20, the circular groove 20 is opened at the top of the transducer body 1, and the transducer body A shielding mechanism is provided below the transducer body 1, and the shielding mechanism is used to shield the bottom end of the transducer body 1 to prevent debris from adhering to the bottom end of the transducer body 1. A moving mechanism is provided inside the fixed shell 23, and the moving mechanism is used to push the transducer body 1 to move, so that the transducer body 1 can extend a sufficient length from the inside of the fixed shell 23. A fixing mechanism is provided on the fixing plate 40, and the fixing mechanism is used to fix the moving rod 24, so that the baffle 31 can be in an open state when the transducer body 1 is working.

[0037] Further, the shielding mechanism includes four groups of baffles 31, which are in contact with each other, and the baffles 31 are rotatably connected to the bottom end of the movable housing 35. The bottom end of the baffle 31 is fixedly connected with a rubber rope 26, and the rubber rope 26 is slidably connected with two groups of guide blocks 27. The guide blocks 27 are fixedly connected to the fixed housing 23. The top end of the rubber rope 26 is fixedly connected with the movable rod 24, and the rubber rope 26 is in a stretched state. The top end of the baffle 31 is close to the bottom end of the transducer body 1, and the inside of the baffle 31 and the bottom end of the movable housing 35 are fixedly connected with magnets, and the baffle 31 is attracted to the bottom end of the movable housing 35.

[0038] The shielding mechanism has a structure design that realizes the function of shielding the bottom of the transducer body 1, so that when the transducer body 1 is put into water, debris on the water surface will not adhere to the transducer body 1, and when the transducer body 1 needs to work, the baffle 31 can be opened to avoid shielding the transducer body 1. When working, in the initial state, the four groups of baffles 31 contact each other and shield the bottom of the movable housing 35, separating the transducer body 1 from the outside world, and the transducer body 1 and the fixed outer housing 35 are connected. When the housing 23 is put into the water, debris on the water surface will adhere to the baffle 31 to prevent the debris from adhering to the bottom of the transducer body 1 and affecting the operation of the transducer body 1. Then, the four groups of moving rods 24 are pulled upward. When the moving rods 24 move upward, since the top of the rubber rope 26 is connected to the moving rod 24 and the rubber rope 26 is in a stretched state, the rubber rope 26 will pull the baffle 31 to rotate and overcome the attraction of the magnet between the baffle 31 and the moving housing 35. After the four groups of baffles 31 rotate, the fixed housing 2 The transducer body 1 inside the fixed housing 23 will be exposed, so that the transducer body 1 can be extended from the fixed housing 23 and work normally. The rubber rope 26 is also slidably connected with the two groups of guide blocks 27. The guide blocks 27 are provided with holes corresponding to the rubber rope 26. The friction between the surface of the rubber rope 26 and the inner wall of the guide block 27 is used to assist in fixing the rubber rope 26 to ensure that the rubber rope 26 will not be easily pulled. At the same time, when the moving rod 24 is not pulled, under the action of water pressure, the top of the baffle 31 can fit together with the bottom of the moving housing 35 to ensure that the baffle 31 will not rotate easily. Four groups of connecting springs 39 are also fixed on the inner wall of the fixed housing 23. The connecting springs 39 can connect the fixed housing 23 with the transducer body 1, so that the transducer body 1 and the fixed housing 23 can be put into the water as a whole. At the same time, when the transducer body 1 is not in use, the fixed housing 23 can also protect the transducer body 1, so as to facilitate the daily placement and storage of the transducer body 1.

[0039] Further, the moving mechanism includes a connecting rod 29, the bottom end of the connecting rod 29 is fixedly connected to a connecting block 30, the inside of the connecting block 30 is slidably connected to a protrusion 51, the inner wall of the connecting block 30 is fitted with the protrusion 51, the protrusion 51 is fixedly connected to the moving shell 35, the top end of the moving shell 35 is inserted into the inside of the storage groove 36, the top end of the moving shell 35 is slidably connected to the inner wall of the storage groove 36, the storage groove 36 is opened at the bottom end of the fixed shell 23, the top end of the moving shell 35 is fitted with the inner wall of the storage groove 36, and the storage groove 36 A notch 38 is provided on the inner wall, and the width of the notch 38 is adapted to the width of the connecting block 30. The top of the connecting rod 29 is fixedly connected to the bottom of the moving rod 24, and the top of the connecting rod 29 passes through the top of the fixed shell 23. A slide groove 34 is provided on the connecting rod 29, and a slider 50 is slidably connected inside the slide groove 34. The slider 50 is fixedly connected to the inner wall of the rotating rod 33. The rotating rod 33 is rotatably connected to the fixed block 25 near the top, and the top of the fixed block 25 is fixedly connected to the inner wall of the fixed shell 23.

[0040] Through the structural design of the moving mechanism, in the process of opening the baffle 31, the moving shell 35 can move upward, and the transducer body 1 will be pushed downward, so that the transducer body 1 can extend a sufficient length from the inside of the fixed shell 23, ensuring that the bottom end of the transducer body 1 can be fully exposed, thereby reducing the interference of the fixed shell 23 and the moving shell 35 on the transducer body 1, so as to facilitate the normal operation of the transducer body 1. During operation, when the moving rod 24 is pulled to move upward, since the bottom end of the moving rod 24 is connected to the connecting rod 29, the connecting rod 29 will be pulled to move upward, and the slider 50 will slide in the slide groove 34. The upward movement of the connecting rod 29 will cause the rotating rod 33 to rotate on the fixed block 25, and the top part of the rotating rod 33 will abut against the top of the transducer body 1 and push the transducer body 1, so that It moves downward, and at this time the four groups of connecting springs 39 will be stretched, and the connecting block 30 fixed on the connecting rod 29 will push the movable housing 35 to move, and the movable housing 35 will be stored in the storage groove 36, so that the transducer body 1 can extend from the inside of the fixed housing 23. When the connecting rod 29 starts to move upward, the inner wall of the connecting block 30 can only drive the movable housing 35 to move normally after it abuts against the bottom end of the protrusion 51. The wire 22 located below the fixed ring 21 is not tightened, so that when the transducer body 1 moves downward, it will not cause pulling on the wire 22 connected to the top of the transducer body 1. The top of the movable housing 35 is slidably connected to the inner wall of the storage groove 36 to prevent the movable housing 35 from falling off. A notch 38 is provided on the inner wall of the storage groove 36, so that the connecting block 30 will not abut against the storage groove 36 when it moves.

[0041] Further, the fixing mechanism includes four groups of rectangular grooves 43, which are provided on the fixing plate 40, the width of which is slightly larger than the width of the moving rod 24, and the inner wall of the rectangular groove 43 is provided with a movable groove 44, the inner wall of the movable groove 44 is fixedly connected with a fixing spring 45, the fixing spring 45 is fixedly connected with a clamping block 46, the clamping block 46 abuts against the moving rod 24, and the moving rod 24 is provided with a slot 49, the inside of the slot 49 is rotatably connected with the plug rod 48;

[0042] Through the structural design of the fixing mechanism, when the moving rod 24 is pulled upward to a certain position, the block 46 will be inserted into the slot 49, so that the position of the moving rod 24 is fixed by the abutment between the inner wall of the slot 49 and the block 46, so that when the transducer body 1 is working, the baffle 31 can always remain in the open state, and when the moving rod 24 needs to be reset, it is only necessary to rotate the insertion rod 48 to release the engagement between the block 46 and the slot 49, making the operation process more convenient. When working, the fixing plate 40 is provided with a rectangular groove 43 and the width of the moving rod 24 is large, so that the moving rod 24 can be moved to the When moving upward, it can smoothly pass through the rectangular groove 43. When the slot 49 on the moving rod 24 is aligned with the block 46, the block 46 will be inserted into the slot 49 under the action of the fixing spring 45, so as to fix the position of the moving rod 24. When it is necessary to contact the engagement between the block 46 and the slot 49, it is only necessary to rotate the insertion rod 48 inserted on the moving rod 24. During the rotation, the bottom end of the insertion rod 48 will push the blocks 46 away from each other, the fixing spring 45 will be compressed, and the block 46 can be re-stored in the movable groove 44. At this time, the moving rod 24 can be smoothly pulled to reset it.

[0043] Furthermore, a pad 28 is fixedly connected to one side of the connecting rod 29 close to the transducer body 1, and the pad 28 is in close contact with the transducer body 1;

[0044] During operation, the pad 28 is fixed on the connecting rod 29 and fits with the transducer body 1, so as to assist in fixing the transducer body 1 inside the fixed shell 23, so as to ensure that the transducer body 1 can remain stable inside the fixed shell 23 and is not prone to shaking, thereby avoiding collision between the transducer body 1 and the inner wall of the fixed shell 23, resulting in wear on the surface of the transducer body 1.

[0045] Furthermore, a circular hole 37 is provided on the inner wall of the storage groove 36 near the top, and the circular hole 37 is provided in multiple groups;

[0046] During operation, the circular hole 37 allows the storage groove 36 to communicate with the outside world. When the mobile housing 35 is stored in the storage groove 36 , water in the storage groove 36 can be smoothly discharged through the circular hole 37 to facilitate normal storage of the mobile housing 35 .

[0047] Furthermore, the moving rod 24 is designed in an L shape, the bottom end of the moving rod 24 fits with the top end of the fixed housing 23, the top end of the moving rod 24 is fixedly connected to the ring 47, and the top end of the ring 47 is fixedly connected with a handle;

[0048] During operation, the top of the moving rod 24 is connected to the ring 47 , and by pulling the handle on the top of the ring 47 , the four groups of moving rods 24 can be smoothly pulled to move.

[0049] Embodiment 2

[0050] See also Figure 8 As shown, comparative example 1 is another embodiment of the present invention, the top end of the insertion rod 48 passes through the ring 47, and the bottom end of the ring 47 fits with the top end of the fixing plate 40;

[0051] During operation, the top end of the rod 48 passes through the ring 47 , and a certain distance is maintained between the top end of the rod 48 and the ring 47 , so that the rod 48 can be easily twisted later, thereby facilitating the rotation of the rod 48 .

[0052] A method for using a low-frequency underwater acoustic transducer with a dual opposite-shore signal excitation function, the method comprising the following steps:

[0053] S1. After connecting the wire 22 to the power amplifier, put the transducer body 1 together with the fixed housing 23 into water;

[0054] S2. Pull the four groups of moving rods 24 upwards. The moving rods 24 pull the rubber rope 26. The bottom end of the rubber rope 26 is fixed to the bottom end of the baffle 31, so that the baffle 31 is pulled to rotate. The four groups of baffles 31 are opened to expose the transducer body 1 inside the fixed housing 23, so as to avoid the baffle 31 blocking the transducer body 1 during operation.

[0055] S3. When the slot 49 on the moving rod 24 is aligned with the block 46, the block 46 will be inserted into the slot 49 to fix the moving rod 24. The baffle 31 will remain in the open state, and the moving rod 24 does not need to be pulled further.

[0056] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A low-frequency underwater acoustic transducer with dual opposite shore signal excitation function, comprising a transducer body (1), the top end of the transducer body (1) being fixedly connected with a wire (22), characterized in that: A fixing ring (21) is fixedly connected to the wire (22), the fixing ring (21) is fixedly connected to a fixing plate (40), the fixing plate (40) is fixedly connected to the top of a fixing shell (23), the inner wall of the fixing shell (23) is fixedly connected to four groups of connecting springs (39), the bottom ends of the connecting springs (39) are fixedly connected to the inner wall of a circular groove (20), the circular groove (20) is provided at the top of the transducer body (1), and a shielding mechanism is provided below the transducer body (1), the shielding mechanism is used to The bottom end of the transducer body (1) is shielded to prevent debris from adhering to the bottom end of the transducer body (1); a moving mechanism is arranged inside the fixed shell (23); the moving mechanism is used to push the transducer body (1) to move so that the transducer body (1) can extend a sufficient length from the inside of the fixed shell (23); a fixing mechanism is arranged on the fixed plate (40); the fixing mechanism is used to fix the moving rod (24) so ​​that the baffle (31) can always be in an open state when the transducer body (1) is working.

2. The low-frequency underwater acoustic transducer with dual opposite shore signal excitation function according to claim 1, characterized in that: The shielding mechanism comprises four groups of baffles (31), the four groups of baffles (31) are in contact with each other, the baffles (31) are rotatably connected to the bottom end of the movable housing (35), the bottom end of the baffle (31) is fixedly connected to a rubber rope (26), the rubber rope (26) is slidably connected to two groups of guide blocks (27), the guide blocks (27) are fixedly connected to the fixed housing (23), the top end of the rubber rope (26) is fixedly connected to the movable rod (24), the rubber rope (26) is in a stretched state, the top end of the baffle (31) is close to the bottom end of the transducer body (1), the inside of the baffle (31) and the bottom end of the movable housing (35) are fixedly connected to magnets, and the baffle (31) is attracted to the bottom end of the movable housing (35).

3. The low-frequency underwater acoustic transducer with dual opposite shore signal excitation function according to claim 1, characterized in that: The moving mechanism comprises a connecting rod (29), the bottom end of the connecting rod (29) is fixedly connected to a connecting block (30), the interior of the connecting block (30) is slidably connected to a protrusion (51), the inner wall of the connecting block (30) is fitted with the protrusion (51), the protrusion (51) is fixedly connected to a moving shell (35), the top end of the moving shell (35) is inserted into a receiving groove (36), the top end of the moving shell (35) is slidably connected to the inner wall of the receiving groove (36), the receiving groove (36) is opened at the bottom end of the fixed shell (23), the top end of the moving shell (35) is fitted with the inner wall of the receiving groove (36), and the receiving groove (36) is fixedly connected to the moving shell (35). ) is provided with a notch (38) on the inner wall, the width of the notch (38) is adapted to the width of the connecting block (30), the top end of the connecting rod (29) is fixedly connected to the bottom end of the moving rod (24), the top end of the connecting rod (29) passes through the top end of the fixed shell (23), the connecting rod (29) is provided with a slide groove (34), the inside of the slide groove (34) is slidably connected with a slider (50), the slider (50) is fixedly connected to the inner wall of the rotating rod (33), the rotating rod (33) is rotatably connected to the fixed block (25) near the top, and the top end of the fixed block (25) is fixedly connected to the inner wall of the fixed shell (23).

4. The low-frequency underwater acoustic transducer with dual opposite shore signal excitation function according to claim 1, characterized in that: The fixing mechanism comprises four groups of rectangular grooves (43), the rectangular grooves (43) are provided on the fixing plate (40), the width of the rectangular grooves (43) is slightly larger than the width of the moving rod (24), the inner wall of the rectangular groove (43) is provided with a movable groove (44), the inner wall of the movable groove (44) is fixedly connected with a fixing spring (45), the fixing spring (45) is fixedly connected with a clamping block (46), the clamping block (46) is in contact with the moving rod (24), the moving rod (24) is provided with a slot (49), the interior of the slot (49) is rotatably connected with an insert rod (48).

5. The low-frequency underwater acoustic transducer with dual opposite shore signal excitation function according to claim 3, characterized in that: A pad (28) is fixedly connected to one side of the connecting rod (29) close to the transducer body (1), and the pad (28) is in close contact with the transducer body (1).

6. The low-frequency underwater acoustic transducer with dual opposite shore signal excitation function according to claim 3, characterized in that: A circular hole (37) is provided on the inner wall of the storage groove (36) near the top, and the circular holes (37) are provided in multiple groups.

7. The low-frequency underwater acoustic transducer with dual opposite shore signal excitation function according to claim 2, characterized in that: The moving rod (24) is designed to be L-shaped, the bottom end of the moving rod (24) is in contact with the top end of the fixed housing (23), the top end of the moving rod (24) is fixedly connected to a circular ring (47), and a handle is fixedly connected to the top end of the circular ring (47).

8. The low-frequency underwater acoustic transducer with dual opposite shore signal excitation function according to claim 4, characterized in that: The top end of the insertion rod (48) passes through the circular ring (47), and the bottom end of the circular ring (47) fits with the top end of the fixing plate (40).

9. A method for using a low-frequency underwater acoustic transducer with dual opposite-shore signal excitation function, applied to a low-frequency underwater acoustic transducer with dual opposite-shore signal excitation function as claimed in any one of claims 1 to 8, characterized in that: The method comprises the following steps: S1. After connecting the wire (22) to the power amplifier, place the transducer body (1) together with the fixed housing (23) into water; S2. Pull the four groups of moving rods (24) upwards, and the four groups of baffles (31) will open, so as to expose the transducer body (1) inside the fixed housing (23), and prevent the baffles (31) from blocking the transducer body (1) during operation; S3. When the slot (49) provided on the moving rod (24) is aligned with the block (46), the block (46) will be inserted into the slot (49), thereby fixing the moving rod (24), and the baffle (31) will remain in the open state, and at this time, the moving rod (24) does not need to be pulled further.

10. The method for using the low-frequency underwater acoustic transducer with dual opposite shore signal excitation function according to claim 9, characterized in that: The S2 specifically comprises: pulling the moving rod (24) upwards, the moving rod (24) pulling the rubber rope (26), the bottom end of the rubber rope (26) being fixed on the bottom end of the baffle (31), thereby pulling the baffle (31) to rotate, and the baffle (31) is opened.

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