An adaptive device for seismic instrument gravity in complex submarine terrain

Abstract

The present invention discloses a gravity self-adaptive device for a seabed complex terrain seismograph, which includes a spherical sealed housing, a load-bearing frame, a contact sliding member, a seismometer bearing box, and a gravity pendulum. The spherical sealed housing is used to isolate seawater and accommodate the load-bearing frame, the contact sliding member, the seismometer bearing box, and the gravity pendulum. The load-bearing frame is used to install and fix the contact sliding member, the seismometer bearing box, and the gravity pendulum. The contact sliding member is installed and fixed on the outer side of the load-bearing frame and is in sliding contact with the inner side of the spherical sealed housing. The seismometer bearing box is used to carry and fix the seismometer. The gravity pendulum is used to carry heavy objects and make the BHZ component always vertically downward by relying on the gravity of the heavy objects. The present invention does not require a motor drive to make the device vertical, is safe and stable and has no additional power consumption, and can enable the instrument to obtain a longer seismic recording time. The device is stable, easy to process, and low in cost, and is suitable for mass production and application. It is convenient to install and disassemble and is easy to carry, with strong adaptability.

Description

Technical Field

[0001] The present invention relates to the fields of marine seismic exploration and marine surveys, and specifically refers to a gravity adaptive device for a seabed seismograph in complex terrain. Background Art

[0002] A seabed seismograph is an effective device for detecting the oceanic crust, the oceanic lithosphere and the deep structure, and has irreplaceable advantages in studying marine evolution, tectonics and seabed resources. Therefore, it is an essential survey equipment for revealing seabed fractures, magmatic activities and resource exploration. In addition, marine surveys are also a basic part of China's marine territorial resource surveys.

[0003] Currently, a seabed seismograph mainly consists of two parts: a shipborne acoustic control device and a seabed seismograph. The seismograph integrates an acoustic release system, a three-component seismometer, a hydrophone, an attitude control system and other data acquisition devices. Since the seabed seismograph is dropped from a survey ship before collection and freely floats and sinks to the seabed. Therefore, during offshore operations, once dropped, the seabed seismograph is out of the control of the survey personnel. Due to the influence of factors such as seawater flow, internal waves, waves and tides, the survey personnel on the ship have no way to adjust the placement attitude of the seabed seismograph, so it completely relies on its own attitude adjustment system. However, the attitude adjustment system has many limitations, making it difficult for the vertical component of the seismometer to remain vertically downward, which brings great difficulties to the subsequent processing of seismic data. Currently, general seabed seismographs use methods such as stepping motors and silicone oil-sealed seismometers to adjust the attitude. However, the system using motors cannot be adjusted after exceeding the critical angle, and the adjustment occurs after the attitude changes, making it difficult to adapt to the complex and changeable seabed environment. In addition, this method has a high power consumption and is difficult to continuously adjust for a long time. Another method is to use a silicone oil-sealed seismometer and utilize the plastic characteristics of silicone oil to adjust, but due to the solid-liquid phase characteristics of silicone oil, part of the wave field information will be lost. These methods are not only complex in design, but also result in poor stability of the attitude adjustment system, low adaptability, and reduced quality and signal-to-noise ratio of seismic signals. Summary of the Invention

[0004] Aiming at the defects of the existing attitude adjustment system, the purpose of the present invention is to provide a gravity adaptive device for a seabed seismograph in complex terrain, which is more stable and reliable than the existing technology.

[0005] The present invention adopts the following technical solutions:

[0006] An underwater complex terrain seismograph gravity self - adapting device, comprising a spherical sealed accommodation housing, a load - bearing frame, a contact sliding component, a seismometer bearing box, and a gravity pendulum; the spherical sealed accommodation housing is used to isolate seawater and accommodate the load - bearing frame, the contact sliding component, the seismometer bearing box, and the gravity pendulum; the load - bearing frame is used to install and fix the contact sliding component, the seismometer bearing box, and the gravity pendulum; the contact sliding component is installed and fixed on the outer side of the load - bearing frame and is in sliding contact with the inner side of the spherical sealed accommodation housing; the seismometer bearing box is used to carry and fix the seismometer; the gravity pendulum is used to carry heavy objects and make the BHZ component always vertically downward by relying on the gravity of the heavy objects.

[0007] The spherical sealed accommodation housing is composed of two hemispherical shells; the inner wall is smooth, enabling the contact sliding component to freely slide on the inner wall, and achieving airtight isolation of seawater through negative pressure to protect the internal components.

[0008] The load - bearing frame includes three load - bearing rings, and all the load - bearing rings are perpendicularly orthogonally welded into a whole.

[0009] The contact sliding component is composed of balls, sleeves, and springs. The sleeves accommodate the balls and springs; the fixed sleeves are fixed on the load - bearing rings by welding. Part of the balls protrude from the fixed sleeves, and the springs push the balls against the inner side of the spherical sealed accommodation housing.

[0010] The seismometer bearing box is a semi - enclosed structure. The components shown by BH1 and BH2 are orthogonal and fixed on the inner side of the load - bearing ring. The component shown by BHZ is orthogonal and fixed to the components shown by BH1 and BH2 and is connected to the gravity pendulum.

[0011] The gravity pendulum is connected to the seismometer bearing box and the load - bearing frame, used to carry heavy objects, and make the BHZ component always vertically downward by relying on the gravity of the heavy objects.

[0012] The beneficial effects of the present invention:

[0013] (1) Self - adaptability. Utilizing the characteristic that the contact sliding component can freely roll on the inner wall of the external spherical sealed accommodation housing, the attitude can be adjusted automatically by gravity when the instrument is tilted.

[0014] (2) Repeatability. After the equipment is recovered, by replacing the internal instruments carried, it can be reused multiple times during field operations.

[0015] (3) Precision. Utilizing gravity to accurately adjust the instrument attitude in real - time, enabling it to always be in a vertical state; through the contact between the spring and the ball, there is no loss of seismic wave information, and the original wave information can be restored through the instrument response.

[0016] (4) Low power consumption. Since the driving force for the entire device comes from the earth's gravitational field, there is no need for additional power consumption, and it can meet the detection requirements for a longer time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural view of a load-bearing frame of the present invention.

[0018] Figure 2 is Figure 1 a schematic structural view of one of the load-bearing rings in

[0019] Figure 3 is a schematic structural view of the load-bearing frame installed in an external spherical sealed housing sphere.

[0020] Figure 4 is Figure 1 the working principle diagram of the contact sliding member in

[0021] Figure 5 is Figure 1 a schematic structural view of the contact sliding member in

[0022] Figure 6 is Figure 1 the front view of the device shown after correctly installing the equipment.

[0023] Figure 7 is Figure 1 the top view of the device shown after correctly installing the equipment.

[0024] In the figure: external spherical sealed housing 1, load-bearing frame 2, contact sliding member 3, seismometer bearing box 4, and gravity pendulum 5; load-bearing ring 2.1; ball 3.1, fixed sleeve 3.2, spring 3.3; BH1 component 4.1, BH2 component 4.2, BHZ component 4.3. DETAILED DESCRIPTION OF THE INVENTION

[0025] In order to further understand the technical content, characteristics and effects of the present invention, the following examples are listed and described in detail in conjunction with the drawings.

[0026] Example 1

[0027] As Figures 1 to 7 shown, a gravity self-adaptive device for a seismograph in complex submarine terrain includes a spherical sealed housing 1, a load-bearing frame 2, a contact sliding member 3, a seismometer bearing box 4, and a gravity pendulum 5.

[0028] The spherical sealed housing 1 is used to isolate seawater and accommodate the load-bearing frame 2, the contact sliding member 3, the seismometer bearing box 4, and the gravity pendulum 5;

[0029] The load-bearing frame 2 is used for installing and fixing the contact sliding component 3, the seismometer bearing box 4, and the gravity pendulum 5;

[0030] The contact sliding component 3 is installed and fixed on the outer side of the load-bearing frame 2 and is in sliding contact with the inner side of the spherical sealed housing 1;

[0031] The seismometer bearing box 4 is used for bearing and fixing the seismometer;

[0032] The gravity pendulum 5 is used for bearing heavy objects and making the BHZ component always vertically downward by relying on the gravity of the heavy objects.

[0033] The spherical sealed housing 1 is composed of two hemispherical shells; the inner wall is smooth, enabling the contact sliding component 3 to slide freely on the inner wall, and achieving airtight isolation from seawater through negative pressure to protect the internal components.

[0034] The load-bearing frame 2 includes three load-bearing rings (2.1), and all the load-bearing rings are perpendicularly orthogonally welded into a whole.

[0035] As Figure 3 、 4 、5 shows, the contact sliding component 3 is composed of a ball (3.1), a sleeve (3.2), and a spring (3.3), and the sleeve (3.2) houses the ball (3.1) and the spring (3.3).

[0036] The fixed sleeve (3.2) is fixed on the load-bearing ring (2.1) by welding. Part of the ball (3.1) protrudes from the fixed sleeve (3.2), and the spring (3.3) presses the ball (3.1) against the inner side of the spherical sealed housing 1. The fixed sleeve (3.2) assists the rotation of the ball (3.1) and has the function of preventing the ball (3.1) from falling off. The high-strength spring (3.3) provides the required thrust for the ball 3.1, enabling the ball (3.1) to slide smoothly on the inner wall of the external spherical sealed housing 1.

[0037] As Figure 6 、 7 shows, the seismometer bearing box 4 is a semi-closed structure. The components shown as BH1 (4.1) and BH2 (4.2) are orthogonal and fixed on the inner side of the load-bearing ring (2.1). The component shown as BHZ (4.3) is orthogonal and fixed to the components shown as BH1 (4.1) and BH2 (4.2) and is connected to the gravity pendulum 5. In addition, the specific shapes and sizes of the seismometer bearing box 4, that is, the BH1 component 4.1, the BH2 component 4.2, and the BHZ component 4.3, can be selected according to the installed instrument.

[0038] The gravity pendulum 5 is connected to the seismometer bearing box 4 and the load-bearing frame 2, is used for bearing heavy objects, and makes the BHZ component always vertically downward by relying on the gravity of the heavy objects.

[0039] Example 2

[0040] A gravity self-adaptive device for a complex seafloor terrain seismograph, the application of which comprises the following steps:

[0041] Step 1: Device Inspection

[0042] 1.1) Check whether the outer spherical sealing housing 1 of the device has cracks, and whether the connection between the load-bearing frame 2, the contact sliding component 3, and the seismometer load-bearing box 4 is firm and without damage;

[0043] 1.2) Install the device into the seismometer load-bearing box 4, and install heavy objects such as batteries into the gravity pendulum 5.

[0044] Step 2: Device Adjustment

[0045] 2.1) According to the specific operation requirements, install the equipment and weights into the seismometer load-bearing box 4 and the gravity pendulum 5 respectively, and adjust the positions of the equipment and weights so that the device can be kept naturally vertically downward and fixed;

[0046] 2.2) Place the load-bearing frame 2 with the equipment installed in step 2.1 into the external spherical sealing receiving device 1, and adjust the balls 3.1 on the contact sliding part 3 so that they can roll freely on the inner wall of the external spherical sealing receiving device 1;

[0047] Step 3: Instrument storage and deployment

[0048] 3.1) After step 2 is completed, the spherical sealing housing 1 is installed and tested for water tightness. The entire instrument is then placed in the sea area to be investigated and recovered after a period of time.

[0049] Step 4: Device Disassembly

[0050] 4.1) After the instrument is recovered, open the spherical sealed housing 1 and take it out of the seismometer bearing box 4.

[0051] If the instrument for measuring data needs to be measured multiple times, a new instrument is installed in the seismometer load-bearing box 4, and steps 1, 2, and 3 are repeated.

[0052] The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A seismic instrument gravity self - adapting device for complex submarine terrain, characterized in that, It includes a spherical sealed housing (1), a load-bearing frame (2), a contact sliding component (3), a seismometer bearing box (4), and a gravity pendulum (5); The spherical sealed housing (1) is used to isolate seawater and accommodate the load-bearing frame (2), the contact sliding component (3), the seismometer bearing box (4), and the gravity pendulum (5); The load-bearing frame (2) is used to install and fix the contact sliding component (3), the seismometer bearing box (4), and the gravity pendulum (5); The contact sliding component (3) is installed and fixed on the outer side of the load-bearing frame (2) and is in sliding contact with the inner side of the spherical sealed housing (1); The seismometer bearing box (4) is used to carry and fix the seismometer; The gravity pendulum (5) is used to carry heavy objects and make the BHZ component always vertically downward by relying on the gravity of the heavy objects; The spherical sealed housing (1) is composed of two hemispherical shells; the inner wall is smooth, which can enable the contact sliding component (3) to slide freely on the inner wall, and realizes airtight isolation of seawater through negative pressure to protect the internal components; The load-bearing frame (2) includes three load-bearing rings (2.1), and all the load-bearing rings are perpendicularly orthogonally welded into a whole; The contact sliding component (3) is composed of a ball (3.1), a sleeve (3.2), and a spring (3.3), and the sleeve (3.2) accommodates the ball (3.1) and the spring (3.3); The fixed sleeve (3.2) is fixed on the load-bearing ring (2.1) by welding, part of the ball (3.1) protrudes from the fixed sleeve (3.2), and the spring (3.3) presses the ball (3.1) against the inner side of the spherical sealed housing 1; The seismometer bearing box (4) is a semi-closed structure, the component shown by BH1 (4.1) and the component shown by BH2 (4.2) are orthogonal and fixed on the inner side of the load-bearing ring (2.1), the component shown by BHZ (4.3) is orthogonally fixed with the component shown by BH1 (4.1) and the component shown by BH2 (4.2), and is connected to the gravity pendulum (5); The gravity pendulum (5) is connected to the seismometer bearing box (4) and the load-bearing frame (2), is used to carry heavy objects, and makes the BHZ component always vertically downward by relying on the gravity of the heavy objects.

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