A kind of acquisition transmission module and offshore seismic exploration acquisition cable to which it is applied

Abstract

The application belongs to the technical field of marine exploration equipment, and discloses a collection transmission module and an offshore seismic exploration collection cable applying the same. The collection transmission module is embedded in a reserved window of the collection cable, and comprises: two waterproof end blocks which are fusionally connected with the cable core wire and the cable sheath layer and are used for axial limiting and end sealing; a protective shell which is internally provided with a space for accommodating a collection control circuit board; two fixed end caps which are used for fixing the shell; a limiting assembly which is composed of an inner lining ring, a limiting block and a limiting pillar and is connected between the waterproof end block and the fixed end cap; and the collection transmission module is integrally solidified by filling the gaps between the components through an internal adhesive structure, and is integrally coated by an injection molding protective layer on the outside. The collection transmission module solves the problems that the module is prone to loosening, poor sealing and difficult to maintain in a complex marine environment, and significantly improves the stability and reliability of seismic data collection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of marine exploration equipment, in particular to a collection and transmission module and an offshore seismic exploration collection cable applying the same. BACKGROUND

[0002] Offshore seismic exploration is a key means to obtain seabed geological structure information. During operation, the exploration ship drags a collection cable several kilometers long to travel in the sea, and a large number of geophones are arranged on the cable at a certain interval to receive the seismic wave signals generated by the artificial seismic source and reflected by the underground strata. The collection and transmission module is a core electronic unit embedded in the collection cable, which is responsible for issuing collection commands to the geophone, receiving and amplifying the analog signals of the geophone, analog-to-digital conversion, filtering and other processing, and finally uploading the digitized seismic data to the shipborne recording system.

[0003] Due to the extremely complex and harsh offshore operation environment, the collection cable needs to be frequently reeled in and out and withstand the continuous effects of sea current impact and wave sway, which puts high requirements on the long-term working stability of the embedded collection and transmission module. Currently, such modules generally face the following technical problems: First, the traditional collection and transmission module is mainly fixed in the collection cable body by adhesion or simple buckle, and under the dynamic working conditions of repeated bending and twisting of the collection cable, the collection and transmission module is prone to axial movement, radial rotation or shaking inside the cable body. This micro-motion will gradually lead to the failure of the outer protective layer of the module, the fatigue fracture or poor contact of the internal connection lines (especially the welding points with the cable core), resulting in signal transmission interruption or noise increase, which seriously affects the data collection quality. Second, in order to improve the overall waterproof and mechanical protection performance of the collection and transmission module, the whole encapsulation or one-time packaging process is usually adopted. However, once the internal circuit fails, it is extremely difficult to maintain, often requiring the destruction of the cable sheath or even the entire collection and transmission module, resulting in high maintenance cost and long cycle, which seriously affects the exploration operation efficiency. Third, the collection cable needs to have a certain bending flexibility and axial stretchability to adapt to the towing operation, while the electronic components inside the collection and transmission module need a rigid stable working environment. The traditional design is difficult to ensure the structural rigidity of the collection and transmission module while compatible with the flexibility requirements of the cable as a whole, which is prone to stress concentration at the joint of the two, accelerating the structural aging.

[0004] Therefore, there is an urgent need in the art to fundamentally solve the stability, reliability and maintainability problems of the collection and transmission module in the complex marine dynamic environment, while adapting to the physical characteristics of the collection cable, so as to ensure the efficient, continuous and reliable operation of the seismic data collection operation. SUMMARY

[0005] In order to ensure that the acquisition transmission module can maintain structural stability, electrical reliability and facilitate maintenance in a dynamic and harsh marine towed cable operation environment for a long time, the application provides an acquisition transmission module and an offshore seismic exploration acquisition cable applying the same.

[0006] According to an aspect of the embodiment of the application, an acquisition transmission module is provided, which is embedded in a reserved window of a cable body of an acquisition cable, the reserved window is formed by cutting and removing part of a foamed float layer and a cable sheath layer along the axial direction of the cable body of the acquisition cable, the reserved window exposes the cable core wire and forms an axial extension space for accommodating the acquisition transmission module; the acquisition transmission module comprises: two waterproof end blocks respectively located at the axial two ends of the reserved window, the waterproof end blocks are connected with the cable core wire and the cable sheath layer at the same time, and are used for realizing axial positioning and end sealing of the acquisition transmission module; a protection shell is located at the central position of the reserved window, and comprises two sub-protection shells which are buckled on the outside of the cable core wire, and each of the sub-protection shells forms a space for accommodating an acquisition control circuit board; two fixed end caps are connected at the axial two ends of the protection shell, and are used for fixedly connecting the two sub-protection shells which are buckled on each other; a limiting assembly is located between the waterproof end block and the fixed end cap, and the limiting assembly comprises an inner lining ring which is abutted between the waterproof end block and the fixed end cap and is sleeved on the outside of the cable core wire, a limiting block which is fixedly sleeved on the outside of the inner lining ring, and a limiting support which is inserted into the waterproof end block at one end and is inserted into the limiting block at the other end, the fixed end cap is sleeved on the outside of the inner lining ring and is located between the limiting block and the protection shell; an injection molding protection layer is coated on the outside of the protection shell, the fixed end cap, the limiting assembly and part of the cable sheath layer, and forms an overall protection structure; and an internal adhesive structure is formed by a cured filling adhesive, the filling adhesive is filled in at least the gaps between the protection shell and the fixed end cap, the inner lining ring and the limiting block and the fixed end cap, the inner wall of the inner lining ring and the outer surface of the cable core wire, and the limiting support and the waterproof end block and the limiting block, so that the internal structure of the module is cured as a whole.

[0007] Further, the inner lining ring comprises a cylindrical inner lining surface extending along the axial direction, a ring shoulder protruding radially at one end of the inner lining surface, and a sealing protruding ring arranged on the inner surface of the ring shoulder; the ring shoulder is matched with the end surface of the limiting block to realize axial positioning, and the sealing protruding ring is used for sealing the annular gap between the inner lining ring and the cable core wire when the adhesive is injected.

[0008] Further, the limiting block is annular, and a through hole is arranged in the center of the limiting block for the inner lining ring to pass through, an inner peripheral wall at one end of the through hole is provided with a fitting concave ring for matching with the ring shoulder of the inner lining ring; a plurality of first limiting holes for matching with the insertion of the limiting support are arranged on the ring body of the limiting block in a circumferential direction, and at least one glue guiding hole is arranged in communication with the through hole.

[0009] Further, the limiting pillar comprises a first insertion part and a second insertion part which are arranged in an axial staggered manner, the first insertion part is inserted into the waterproof end block, and the second insertion part is inserted into the first limiting hole of the limiting block.

[0010] Further, the waterproof end block is annular, a wire hole for the cable core wire to pass through is arranged in the center of the waterproof end block, one end face of the waterproof end block is an assembly end face for abutting against the limiting block, a plurality of second limiting holes for inserting the first insertion part are arranged on the annular body of the waterproof end block in a circumferential direction, and a groove for enhancing the fusion connection strength with the cable sheath layer is arranged on the outer surface of the annular body of the waterproof end block.

[0011] Further, each of the sub-protection shells of the protection shell is formed with: an arc-shaped through hole in the interior of the sub-protection shell for accommodating the acquisition control circuit board; a reinforcing rib distributed on the inner surface of the arc-shaped through hole; a first wire passing hole formed between the two sub-protection shells after the two sub-protection shells are buckled for the cable core wire to pass through; a grounding screw hole arranged on the sub-protection shell; a connecting hole arranged on the sub-protection shell in a circumferential direction for connecting with the fixed end cap; a wire bin arranged on the inner side end of the sub-protection shell for coiling the connection line; and a first assembly end face arranged on the axial end of the sub-protection shell for cooperating with the fixed end cap.

[0012] Further, the fixed end cap comprises two halves which cooperate with each other, each half is provided with: a second assembly end face arranged on the axial inner side of the half for axially abutting and preliminarily positioning with the first assembly end face; an assembly cutting surface arranged on the circumferential side of the second assembly end face and arranged at an angle with the second assembly end face, the assembly cutting surface is provided with a fixing screw hole, and the assembly cutting surface is configured to: after the first assembly end face of the protection shell axially abuts with the second assembly end face, by rotating the protection shell around the axis of the cable core wire by a predetermined angle, the connecting hole on the protection shell can be aligned with the fixing screw hole to realize circumferential fixation through a fastener; a wire passing hole end face arranged on the axial outer side of the half, the wire passing hole end face is provided with a semicircular second wire passing hole; and a second buckling end face arranged on the radial outer side of the half; wherein the two halves are buckled to each other through the second buckling end faces, so that the second assembly end faces of the two halves jointly enclose an annular interface which cooperates with the first assembly end face, and the second wire passing holes of the two halves jointly enclose a complete circular channel for the cable core wire to pass through.

[0013] Further, the waterproof end block, the limiting block, the inner lining ring, the limiting pillar and the injection molding protective layer 23 are all made of a high polymer material; the fixed end cap is made of an inorganic non-metallic material; and the protection shell is made of a metal material.

[0014] According to another aspect of the embodiments of the present application, there is provided a marine seismic exploration acquisition cable, comprising: a cable body, an inner part of which is provided with a cable core in an axial direction, and an outer part of which is sequentially covered from inside to outside with a foamed float layer and a cable sheath layer; a plurality of groups of geophones arranged at intervals along the axial direction of the cable body; and at least one acquisition and transmission module as described above, which is located between two adjacent groups of geophones and is embedded in a reserved window of the cable body; wherein the acquisition control circuit board located in one of the two sub-protective housings is connected with the first group of geophones in front of it through a first set of connection lines, for controlling the first group of geophones and acquiring seismic data thereof; the acquisition control circuit board located in the other of the two sub-protective housings is connected with the second group of geophones behind it through a second set of connection lines, for controlling the second group of geophones and acquiring seismic data thereof; and each acquisition control circuit board is further connected with an external system through the cable core, for receiving acquisition commands and uploading the acquired seismic data.

[0015] Further, in the acquisition and transmission module, the cable core is cut off; the first set of connection lines and the second set of connection lines each comprise a geophone control acquisition line for connecting and controlling geophones, a communication line for communicating with an external system, a transmission line for uploading seismic data, and a ground wire; the first set of connection lines and the second set of connection lines are led out from the axial direction of the protective housing, and are welded to corresponding wires drawn out from both ends of the cut-off cable core; and each group of geophones is connected in parallel to the corresponding geophone control acquisition line.

[0016] Compared with the prior art, the acquisition and transmission module and the marine seismic exploration acquisition cable applying the same have the following advantages: in the physical layer, the acquisition and transmission module works by the principle of structural over-constraint combined with material buffering, in which rigid components (such as the protective housing and the fixed end cap) are connected with the cable body anchor points through the limiting assembly to form a stable force skeleton; flexible high polymer components (such as the waterproof end block, the limiting block, the inner lining ring, the limiting pillar, and the injection molding protective layer) act as a buffering medium to absorb and disperse the vibration and deformation energy transmitted by the cable body, protecting the internal precision circuit, while meeting the bending degree, stretching degree, and waterproof requirements required by the cable operation at sea. In the electrical functional layer, the acquisition and transmission module works as a distributed intelligent node, in which the shipborne system issues commands through the communication line in the cable core; the double acquisition control circuit boards in the acquisition and transmission module independently decode the commands and synchronously drive all the geophones (in parallel) on their respective sides to collect seismic signals through the control acquisition lines led out by them; the signals are amplified and analog-to-digital converted inside the module, and then transmitted back to the shipborne system through the transmission line, and the whole working process relies on the non-interference and stable operating environment provided by the aforementioned physically stable structure.

[0017] The acquisition transmission module and the offshore seismic exploration acquisition cable applying the same have the multi-stage limiting and fusion anchoring design, effectively solve the problems of loosening and rotation of the acquisition transmission module in the cable body, and reliability is multiplied; through the packaging process combining the adhesive curing and the integral injection molding, the non-destructive maintenance ability of the core electronic cabin is reserved while realizing the military level protection, so that the traditional contradiction between the high protection and the maintainability is solved; through the modular layout and the parallel welding wiring of the double acquisition control circuit boards, the architecture is optimized from the system level, the fault points are reduced, and the operation efficiency and the operation economy of the whole acquisition cable are significantly improved. Therefore, the acquisition transmission module and the offshore seismic exploration acquisition cable applying the same have the integrated structure design, fundamentally solve the problems of stability, reliability and maintainability of the acquisition transmission module in the complex marine dynamic environment, and adapt to the physical characteristics of the acquisition cable, so as to effectively guarantee the efficient, continuous and reliable operation of the seismic data acquisition operation. BRIEF DESCRIPTION OF DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of preferred embodiments, and are not meant to limit the scope of the embodiments of the present application. Furthermore, like reference numerals are intended to represent the same components throughout the drawings. In the drawings:

[0019] Figure 1 A structure schematic diagram of the acquisition transmission module according to the embodiment of the present application is shown;

[0020] Figure 2 A structure schematic diagram of the acquisition transmission module at B according to the embodiment of the present application is shown;

[0021] Figure 3 An external structure schematic diagram of the acquisition transmission module according to the embodiment of the present application is shown, in which an injection molding protective layer is shown;

[0022] Figure 4 A structure schematic diagram of Figure 2 The inner liner ring and the limiting block cooperation structure are shown;

[0023] Figure 5 A structure schematic diagram of Figure 2 The waterproof end block is shown;

[0024] Figure 6 A structure schematic diagram of Figure 2 The protective shell is shown;

[0025] Figure 7 A structure schematic diagram of Figure 2 The fixed end cap is shown;

[0026] Figure 8 Fig. 7 shows a schematic diagram of an installation structure of the acquisition transmission module according to an embodiment of the present application;

[0027] Figure 9 Fig. 8 shows a schematic diagram of an internal adhesive structure in the acquisition transmission module according to an embodiment of the present application;

[0028] Figure 10 Fig. 9 shows a schematic diagram of a structure of the marine seismic exploration acquisition cable according to an embodiment of the present application;

[0029] Figure 11 Fig. 10 shows a schematic diagram of a connection between the acquisition transmission module and the cable core wire. DETAILED DESCRIPTION

[0030] Exemplary embodiments of the present disclosure will be described hereinafter with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0031] Figures 1 to 3 Fig. 1 shows a structure of an acquisition transmission module 100 according to an embodiment of the present application. In conjunction with Fig. 2, Figures 1 to 3 and Figure 8As shown, the acquisition transmission module 100 is embedded in the reserved window A of the cable body of the acquisition cable, the reserved window A is formed by cutting and removing part of the foamed floating body layer 21 and the cable sheath layer 1 along the axial direction of the cable body, the cable core wire 2 is exposed in the reserved window A, and an axial extension space for accommodating the acquisition transmission module 100 is formed; the acquisition transmission module 100 can include: two waterproof end blocks 10 located at the axial two ends of the reserved window A, the waterproof end blocks 10 are connected with the cable core wire 2 and the cable sheath layer 1 at the same time, and are used for realizing axial positioning and end sealing of the acquisition transmission module 100; a protection shell 4 located at the central position of the reserved window A, including two sub-protection shells which are buckled on the outside of the cable core wire 2, and each sub-protection shell forms a space for accommodating an acquisition control circuit board; two fixed end caps 6 connected at the axial two ends of the protection shell 4, used for fixedly connecting the two sub-protection shells which are buckled; a limiting assembly located between the waterproof end block 10 and the fixed end cap 6, the limiting assembly includes an inner lining ring 3 abutting between the waterproof end block 10 and the fixed end cap 6 and sleeved on the outside of the cable core wire 2, a limiting block 8 sleeved on the outside of the inner lining ring 3, and a limiting support 9 inserted into the waterproof end block 10 at one end and inserted into the limiting block 8 at the other end, the fixed end cap 6 is sleeved on the outside of the inner lining ring 3 and located between the limiting block 8 and the protection shell 4; an injection molding protective layer 23 covering the outside of the protection shell 4, the fixed end cap 6, the limiting assembly and part of the cable sheath layer 1, forming an overall protection structure; and an internal adhesive structure located at the red line as shown, formed by the cured filling glue, the filling glue is filled in at least the gaps between the protection shell 4 and the fixed end cap 6, the inner lining ring 3 and the limiting block 8 and the fixed end cap 6, the inner wall of the inner lining ring 3 and the outer surface of the cable core wire 2, and the limiting support 9 and the waterproof end block 10 and the limiting block 8, so that the internal structure of the module is solidified as a whole. Figure 9 As shown, the acquisition transmission module 100 in the embodiment of the application is embedded in the reserved window A of the cable body of the acquisition cable, the reserved window A is formed by cutting and removing part of the foamed floating body layer 21 and the cable sheath layer 1 along the axial direction of the cable body, the cable core wire 2 is exposed in the reserved window A, and an axial extension space for accommodating the acquisition transmission module 100 is formed; the acquisition transmission module 100 can include: two waterproof end blocks 10 located at the axial two ends of the reserved window A, the waterproof end blocks 10 are connected with the cable core wire 2 and the cable sheath layer 1 at the same time, and are used for realizing axial positioning and end sealing of the acquisition transmission module 100; a protection shell 4 located at the central position of the reserved window A, including two sub-protection shells which are buckled on the outside of the cable core wire 2, and each sub-protection shell forms a space for accommodating an acquisition control circuit board; two fixed end caps 6 connected at the axial two ends of the protection shell 4, used for fixedly connecting the two sub-protection shells which are buckled; a limiting assembly located between the waterproof end block 10 and the fixed end cap 6, the limiting assembly includes an inner lining ring 3 abutting between the waterproof end block 10 and the fixed end cap 6 and sleeved on the outside of the cable core wire 2, a limiting block 8 sleeved on the outside of the inner lining ring 3, and a limiting support 9 inserted into the waterproof end block 10 at one end and inserted into the limiting block 8 at the other end, the fixed end cap 6 is sleeved on the outside of the inner lining ring 3 and located between the limiting block 8 and the protection shell 4; an injection molding protective layer 23 covering the outside of the protection shell 4, the fixed end cap 6, the limiting assembly and part of the cable sheath layer 1, forming an overall protection structure; and an internal adhesive structure located at the red line as shown, formed by the cured filling glue, the filling glue is filled in at least the gaps between the protection shell 4 and the fixed end cap 6, the inner lining ring 3 and the limiting block 8 and the fixed end cap 6, the inner wall of the inner lining ring 3 and the outer surface of the cable core wire 2, and the limiting support 9 and the waterproof end block 10 and the limiting block 8, so that the internal structure of the module is solidified as a whole.

[0032] The acquisition transmission module 100 in the embodiment of the application works as follows: first, the components of the module are assembled in the reserved window A of the cable in sequence: the two waterproof end blocks 10 are fused with the cable core wire 2 and the cable sheath layer 1 at the same time to form fixed anchor points; the limiting assembly (the inner lining ring 3, the limiting block 8 and the limiting support 9) is assembled therebetween to connect the waterproof end block 10 and the fixed end cap 6 in series; the two sub-protection shells of the protection shell 4 are buckled and fixed by the fixed end cap 6; then the filling glue is injected, the glue fills all the gaps and solidifies to integrate the internal structure; finally, the outermost injection molding protective layer 23 is formed by overall injection molding.

[0033] In the acquisition transmission module 100 of the embodiment of the application, the module is embedded in the reserved window A of the cable body, which ensures the structural integration and fluid shape of the module with the acquisition cable body; the two waterproof end blocks 10 connected with the cable core wire 2 and the cable sheath layer 1 form the axial anchoring point and the first end sealing of the module; the limiting assembly composed of the lining ring 3, the limiting block 8 and the limiting support 9 forms the dynamic mechanical management system for transmitting constraints and buffering shocks, which effectively prevents the radial rotation and shaking of the core components; the fastenable protective shell 4 and the locking fixed end cap 6 realize the bearing and protection of the precise circuit while reserving the key openable maintainability; the adhesive structure filled in all internal gaps makes the mechanical connection interfaces lose the micro-motion ability and become an internally rigid whole, which eliminates wear and loosening; finally, the external overall injection molding protective layer 23 provides the ultimate integrated environmental protection. These designs are closely linked to build three layers of stable defense lines: the first layer is the mechanical constraint defense line (waterproof end block 10 anchoring, limiting assembly rotation prevention and shock buffering), which resists external dynamic load; the second layer is the internal glue filling solidification defense line, which eliminates internal micro-motion and makes the dispersed components into a whole; the third layer is the external injection molding protective layer 23 encapsulation defense line, which provides the ultimate environmental sealing and physical protection, thereby ensuring that the electronic module can work long-term, stably and reliably in the extreme marine dynamic environment, while also ensuring the necessary maintainability.

[0034] In the preferred embodiment as shown in Figure 4 The lining ring 3 can include an axially extending cylindrical lining surface 31, a ring shoulder 32 radially protruding at one end of the lining surface 31, and a sealing protruding ring 33 arranged on the inner surface of the ring shoulder 32; the ring shoulder 32 cooperates with the end surface 84 of the limiting block 8 to realize axial positioning, the cable core wire 2 passes through the lining ring hole 34, and the sealing protruding ring 33 is used to seal the annular gap between the lining ring 3 and the cable core wire 2 during glue injection. The cooperation of the ring shoulder 32 and the limiting block 8 provides precise axial positioning for the core force transmission component, the lining ring 3, and ensures the positional certainty of the lining ring 3 when transmitting constraints; the sealing protruding ring 33 can effectively seal the annular gap between the lining ring 3 and the cable core wire 2 during glue injection, prevent improper overflow of glue, and ensure that the key gap is reliably filled, thereby enhancing the integrity of the internal structure.

[0035] In the preferred embodiment as shown in Figure 4In the preferred embodiment shown, the limiting block 8 can be annular, with a through hole in the center for the inner liner ring 3 to pass through, and an inner peripheral wall at one end of the through hole provided with a fitting concave ring 81 for cooperating with the ring shoulder 32 of the inner liner ring 3; a plurality of first limiting holes 82 for plugging and cooperating with the limiting support 9 are arranged on the annular body of the limiting block 8 in a circumferential direction, and at least one glue guide hole 83 is in communication with the through hole. In this embodiment, the fitting concave ring 81 cooperates with the ring shoulder 32 of the inner liner ring to form a reliable axial positioning mechanism; the design of the glue guide hole 83 is crucial, as it provides a special passage for the filling glue to flow into the key gap between the limiting block 8 and the inner liner ring 3 and other components from the outside, ensuring the sufficiency and reliability of the glue injection process.

[0036] In the preferred embodiment shown, Figure 4 In the preferred embodiment shown, the limiting support 9 can include a first plugging part 91 and a second plugging part 92 arranged in axial misalignment, the first plugging part 91 being plugged into the waterproof end block 10, and the second plugging part 92 being plugged into the first limiting hole 82 of the limiting block 8. The axial misalignment of the first plugging part 91 and the second plugging part 92 enables the limiting support 9 to effectively constrain the relative rotation between the waterproof end block 10 and the limiting block 8 when connecting them, thereby enhancing the rigidity of the entire limiting assembly against rotation.

[0037] In the preferred embodiment shown, Figure 5 In the preferred embodiment shown, the waterproof end block 10 can be annular, with a wire hole 103 in the center for the cable core wire 2 to pass through, and an end face at one end being a fitting end face 102 for abutting against the limiting block 8, and a plurality of second limiting holes 101 for plugging the first plugging part 91 being arranged on the annular body in a circumferential direction, and a groove 104 being arranged on the outer surface of the annular body for enhancing the fusion connection strength with the cable sheath layer 1. The design of the groove 104 significantly increases the contact area and mechanical engagement effect of its outer surface with the cable sheath layer 1, making the fusion connection more secure and greatly improving the reliability of the groove 104 as an axial fixed anchor point.

[0038] In the preferred embodiment shown, Figure 6 and Figure 9In the preferred embodiment shown, each of the sub-protective housings 4 can be formed with: an arc-shaped through hole 41 inside for accommodating the collection control circuit board; reinforcing ribs 42 distributed on the inner surface of the through hole; a first threading hole 43 formed between the two sub-protective housings after they are buckled by the first buckling end face 47, for the cable core wire 2 to pass through; a grounding screw hole 44 on the sub-protective housing; a connecting hole 45 on the circumferential side of the sub-protective housing for connecting with the fixed end cap 6; a wire bin 46 on the inner side end of the sub-protective housing for coiling the connecting wire; and a first assembly end face 48 on the axial end of the sub-protective housing for cooperating with the fixed end cap 6. The arc-shaped through hole 41 and the reinforcing ribs 42 realize stable accommodation of the collection control circuit board and improvement of the strength of the housing in limited space; the wire bin 46 provides an orderly coiling space for the internal connecting wire, avoiding disordered wire; and the first assembly end face 48 provides a basis for accurate cooperation with the fixed end cap.

[0039] In the preferred embodiment shown, Figure 7 In the preferred embodiment shown, the fixed end cap 6 can include two halves that cooperate with each other, and each half can be provided with: a second assembly end face 61 on the axial inner side of the half, for axial fitting and initial positioning with the first assembly end face 48; an assembly tangent surface 62 on the circumferential side of the second assembly end face 61 and arranged at an angle with the second assembly end face 61, and provided with a fixed screw hole 63, the assembly tangent surface 62 being configured such that, after the first assembly end face 48 of the protective housing 4 is axially fitted with the second assembly end face 61, the connecting hole 45 on the protective housing 4 can be aligned with the fixed screw hole 63 by rotating the protective housing 4 around the axis of the cable core wire 2 by a predetermined angle, so as to realize circumferential fixation by a fastener; a wire coiling groove 64 on the inner circumferential wall of the half, for coiling the connecting wire; a threading hole end face 65 on the axial outer side of the half, and provided with a semicircular second threading hole 66 for limiting the cable core wire 2; and a second buckling end face 67 on the radial outer side of the half; wherein the two halves are buckled to each other by the second buckling end faces 67, so that the second assembly end faces 61 of the two halves jointly enclose an annular interface that cooperates with the first assembly end face 48, and the second threading holes 66 of the two halves jointly enclose a complete circular passage for the cable core wire 2 to pass through.

[0040] In this embodiment, the angularly arranged assembly cut surface 62 and the second assembly end surface 61 jointly constitute a mechanical angle encoder. When the protective shell 4 is attached to the second assembly end surface 61 and rotated to a preset angle, the profile thereof will rigidly abut against the assembly cut surface 62, which not only provides a clear tactile and visual in-place signal, but also ensures the absolute precise alignment of the connecting hole 45 on the protective shell 4 and the fixing screw hole 63. The traditional cumbersome alignment process relying on the experience of operators and repeated debugging is converted into a one-key operation that is fast, foolproof and unique in result, greatly improving the efficiency and reliability of field assembly and maintenance in harsh marine environments. At the same time, the integrated wire slot 64 and the second wire hole 66 on the half body realize the neat arrangement of internal wiring and the precise positioning of cable cores, which eliminates the assembly interference or electrical failure caused by disordered wiring or core displacement from the details, so that this innovative quick assembly mechanism can be reliably and repeatedly implemented in a compact space.

[0041] In a preferred embodiment, the assembly cut surface 62 can be a flat surface with a fixing screw hole 63, and the area at the axial ends of the protective shell 4 for cooperating with the fixed end cap 6 can be a flange-like structure with a shape similar to a square or rectangle. The side surface thereof can serve as the profile abutting against the assembly cut surface 62. In this embodiment, the assembly cut surface 62 with a fixing screw hole 63 on the fixed end cap 6 and the non-cylindrical flange profile at the end of the protective shell 4 jointly constitute a mechanical coding and hard stop mechanism. The working principle thereof is to uniquely decode the rotation angle into an accurate spatial alignment position through a pre-set complementary geometric shape. This design converts the complex and error-prone visual alignment into a foolproof one-hand operation of rotating to stop, which greatly improves the efficiency and reliability of assembly and maintenance in harsh sea conditions. At the same time, the rigid mechanical stop ensures that each connection can achieve an absolutely consistent and precise state, which eliminates human errors from the root, makes the fastening stress uniform, and significantly enhances the vibration resistance and long-term connection reliability of the module.

[0042] According to the application, in a preferred embodiment, the waterproof end block 10, the limiting block 8, the inner lining ring 3, the limiting support 9 and the injection molding protective layer 23 can all be made of polymer materials; the fixed end cap 6 can be made of inorganic non-metallic materials; and the protective shell 4 can be made of metal materials. In this embodiment, the metal protective shell 4 provides firm electromagnetic shielding and structural support for the internal precision circuit; the inorganic non-metallic fixed end cap 6 has sufficient rigidity while avoiding the risk of electrochemical corrosion that may be caused by metal; and the waterproof end block 10, the limiting assembly and the injection molding protective layer 23 made of polymer materials collectively give the module matching flexibility, shock absorption and excellent environmental sealing with the cable body. This multi-material combination strategy of metal, inorganic non-metallic and polymer materials skillfully resolves the inherent contradiction between the rigidity and stability of electronic equipment and the dynamic flexibility of the cable, so that the acquisition and transmission module 100 meets the flexibility and stretchability required by the cable (polymer components provide cushioning) in a macroscopic sense, and ensures the structural strength and electromagnetic shielding (metal shell) in the microscopic core area (electronic cabin), which is an intelligent material layout facing system requirements.

[0043] In a preferred embodiment as shown in Figure 8 In this embodiment, the outer diameter of the waterproof end block 10 after being fused with the cable sheath layer 1, the maximum outer diameter of the limiting assembly in the reserved window, and the maximum outer diameter of the fixed end cap 6 and the protective shell 4 after assembly are all equal. The setting of this embodiment ensures the uniform thickness of the injection molding protective layer 23 formed by subsequent injection molding, which not only eliminates stress concentration points caused by sudden thickness changes, significantly improves the tear resistance and impact resistance of the overall protective layer, but also makes the molten material flow smoothly and cool uniformly during the injection molding process, thereby obtaining a perfect coating with stronger bonding force and higher integrity between the internal structure and the cable sheath layer 1, which guarantees the ultimate reliability of the module in harsh marine environments from both material and process dimensions.

[0044] Figure 10 The structure of the offshore seismic exploration acquisition cable 200 according to an embodiment of the application is shown. As shown in Figure 10 The offshore seismic exploration acquisition cable 200 can include: a cable body, which has a cable core 2 arranged axially inside and is covered with a foamed float layer 21 and a cable sheath layer 1 from inside to outside; a plurality of groups of geophones arranged at intervals along the axial direction of the cable body; and at least one acquisition and transmission module 100 located between two adjacent groups of geophones and embedded in the reserved window A of the cable body. In combination with Figure 11As shown, the first acquisition control circuit board 51 located in one of the two sub-protective shells is connected with the first group of geophones in front of it through the first set of connection lines for controlling the first group of geophones and acquiring seismic data thereof; the second acquisition control circuit board 52 located in the other of the two sub-protective shells is connected with the second group of geophones behind it through the second set of connection lines for controlling the second group of geophones and acquiring seismic data thereof; each acquisition control circuit board is also connected with an external system through the cable core wire 2 to receive acquisition commands and upload acquired seismic data.

[0045] The offshore seismic exploration acquisition cable 200 of the embodiment of the present application takes the aforementioned highly stable and reliable acquisition transmission module 100 as a core control node, adopts a distributed architecture in which one acquisition transmission module 100 controls two groups of geophones on the two sides, and integrates the acquisition transmission module 100 into the cable system, which minimizes the number of electronic units from the top layer of the system, thereby directly reducing the number of potential failure points and manufacturing costs of the whole cable; meanwhile, the first acquisition control circuit board 51 and the second acquisition control circuit board 52 arranged in the acquisition transmission module 100 are precisely driven to the geophone groups on the two sides thereof through independent connection lines, and such a design of functional isolation and physical partition not only optimizes the signal path and reduces crosstalk, but also enables quick and precise positioning to the corresponding control unit or line when a local geophone array is abnormal, thereby greatly improving the diagnosability and maintenance efficiency of the system.

[0046] In the preferred embodiment as shown, Figure 11 In the preferred embodiment as shown,

[0047] In this embodiment, the cable core wire 2 is truncated at the acquisition transmission module 100 and directly welded with the module lead, which completely discards the traditional connector, eliminates the most common failure sources caused by poor contact, oxidation or vibration loosening, and realizes a permanent electrical connection similar to the strength of the cable body; meanwhile, the design of parallel connection of the geophones enables a single geophone failure not to affect the work of other geophones in the same group, thereby greatly improving the robustness and maintainability of the system. In addition, such a clear and standard modular wiring logic simplifies fault positioning, and maintenance personnel can quickly determine whether the problem belongs to the module, the line or the specific geophone, thereby changing the system maintenance from vague overall repair to precise unit replacement.

[0048] It should be noted that the technical terms or scientific terms used in the present application should be understood as the general meanings understood by the skilled in the art of the present application, unless otherwise specified.

[0049] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "axial", "radial", "circumferential", "inner side" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0050] In addition, the terms "first", "second", and the like are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

[0051] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A data acquisition and transmission module, characterized in that, The reserved window is embedded in the cable body of the acquisition cable. The reserved window is formed by cutting along the axial direction of the acquisition cable body and removing part of the foamed float layer and cable sheath layer (1). The cable core wire (2) is exposed in the reserved window and an axial extension space for accommodating the acquisition and transmission module is formed. The data acquisition and transmission module includes: Two waterproof end blocks (10) are located at the two ends of the reserved window along the axial direction. The waterproof end blocks (10) are simultaneously fused with the cable core (2) and the cable sheath layer (1) to achieve axial positioning and end sealing of the acquisition and transmission module. The protective housing (4) is located at the center of the reserved window and includes two sub-protective housings that are fastened to each other outside the cable core (2). Each sub-protective housing has a space for accommodating the acquisition and control circuit board. Two fixed end caps (6) are respectively connected to the two axial ends of the protective housing (4) for fixing the two interlocking sub-protective housings; The limiting component is located between the waterproof end block (10) and the fixed end cap (6). The limiting component includes an inner liner ring (3) that abuts against the waterproof end block (10) and the fixed end cap (6) and is sleeved on the outside of the cable core (2), a limiting block (8) that is sleeved and fixed on the outside of the inner liner ring (3), and a limiting support (9) that is inserted into the waterproof end block (10) at one end and into the limiting block (8) at the other end. The fixed end cap is sleeved on the outside of the inner liner ring (3) and is located between the limiting block (8) and the protective shell (4). An injection-molded protective layer (23) covers the exterior of the protective housing (4), the fixed end cap (6), the limiting component, and part of the cable sheath layer (1), forming an overall protective structure; and The internal adhesive structure is formed by cured filler adhesive, which fills at least the gaps between the protective shell (4) and the fixed end cap (6), between the inner liner ring (3) and the limiting block (8) and the fixed end cap (6), between the inner wall of the inner liner ring (3) and the outer surface of the cable core (2), and between the limiting support (9) and the waterproof end block (10) and the limiting block (8), so that the internal structure of the module is cured into one piece.

2. The acquisition and transmission module according to claim 1, characterized in that, The inner liner ring (3) includes a cylindrical inner liner surface (31) extending axially, a ring shoulder (32) protruding radially at one end of the inner liner surface (31), and a sealing protrusion ring (33) disposed on the inner surface of the ring shoulder (32); the ring shoulder (32) cooperates with the end face of the limiting block (8) to achieve axial positioning, and the sealing protrusion ring (33) is used to seal the annular gap between the inner liner ring (3) and the cable core wire (2) during glue injection.

3. The acquisition and transmission module according to claim 2, characterized in that, The limiting block (8) is annular, with a through hole at its center for the inner lining ring (3) to pass through. The inner circumferential wall at one end of the through hole is provided with an assembly recess (81) for engaging with the ring shoulder (32) of the inner lining ring (3). The ring body of the limiting block (8) is provided with a plurality of first limiting holes (82) spaced circumferentially for engaging with the limiting support column (9), and at least one guide hole (83) communicating with the through hole.

4. The acquisition and transmission module according to claim 3, characterized in that, The limiting support (9) includes a first insertion part (91) and a second insertion part (92) that are offset in the axial direction. The first insertion part (91) is inserted into the waterproof end block (10), and the second insertion part (92) is inserted into the first limiting hole (82) of the limiting block (8).

5. The acquisition and transmission module according to claim 4, characterized in that, The waterproof end block (10) is annular, with a wire hole (103) in the center for the cable core (2) to pass through. One end face is an assembly end face (102) for abutting against the limiting block (8). The ring body has a plurality of second limiting holes (101) for inserting the first plug-in part (91) along the circumferential direction. The outer surface of the ring body has a groove (104) for enhancing the fusion connection strength with the cable sheath layer (1).

6. The acquisition and transmission module according to any one of claims 1 to 5, characterized in that, Each of the sub-protective housings of the protective housing (4) has the following features: an arc-shaped through hole (41) located inside for accommodating the acquisition control circuit board; reinforcing ribs (42) distributed on the inner surface of the arc-shaped through hole; a first through hole (43) formed between the two sub-protective housings after they are fastened together for the cable core wire (2) to pass through; a grounding screw hole (44) located on the sub-protective housing; a connection hole (45) located on the circumference of the sub-protective housing for connecting to the fixed end cap (6); a wire compartment (46) located on the inner end of the sub-protective housing for winding the connecting line; and a first mounting end face (48) located on the axial end of the sub-protective housing that mates with the fixed end cap (6).

7. The acquisition and transmission module according to claim 6, characterized in that, The fixed end cap (6) includes two mating halves, each half having: The second assembly end face (61) located on the axial inner side of the half body is used to axially fit and initially position with the first assembly end face (48); An assembly cut surface (62) located on the periphery of the second assembly end face (61) and set at an angle to the second assembly end face (61) is provided with a fixing screw hole (63). The assembly cut surface (62) is configured such that when the first assembly end face (48) of the protective housing (4) is axially attached to the second assembly end face (61), by rotating the protective housing (4) around the axis of the cable core (2) by a preset angle, the connecting hole on the protective housing (4) can be aligned with the fixing screw hole (63) so as to achieve circumferential fixation by fasteners. The end face (65) of the threading hole located on the outer side of the axial direction of the half body, wherein a semi-circular second threading hole (66) is provided on the end face (65); and The second engaging end face (67) is located on the radially outer side of the half body; The two halves are engaged with each other through the second engagement end face (67), so that the second assembly end face (61) of the two halves together form an annular interface that matches the first assembly end face (48), and the second wire hole (66) of the two halves together form a complete circular channel through which the cable core wire (2) passes.

8. The acquisition and transmission module according to any one of claims 1 to 5, characterized in that, The waterproof end block (10), the limiting block (8), the inner lining ring (3), the limiting support column (9), and the injection-molded protective layer (23) are all made of polymer materials; the fixed end cap (6) is made of inorganic non-metallic materials; and the protective shell (4) is made of metallic materials.

9. A marine seismic exploration acquisition cable, characterized in that, include: The cable body has cable cores (2) arranged axially inside, and is covered with a foamed float layer (21) and a cable sheath layer (1) from the inside to the outside. Multiple sets of detectors are arranged at intervals along the axial direction of the cable; and At least one acquisition and transmission module according to any one of claims 1 to 8 is located between two adjacent sets of detectors and embedded in a reserved window of the cable body; The acquisition control circuit board located in one of the two sub-protective housings is connected to a first group of geophones located in front of it via a first set of connection lines, and is used to control the first group of geophones and acquire their seismic data; the acquisition control circuit board located in the other of the two sub-protective housings is connected to a second group of geophones located behind it via a second set of connection lines, and is used to control the second group of geophones and acquire their seismic data; each acquisition control circuit board also communicates with an external system via the cable core (2) to receive acquisition commands and upload the acquired seismic data.

10. The marine seismic exploration acquisition cable according to claim 9, characterized in that, Within the acquisition and transmission module, the cable core (2) is cut off; both the first set of connection lines and the second set of connection lines include: a detector control acquisition line for connecting and controlling the detector, a communication line for communicating with an external system, a transmission line for uploading seismic data, and a ground wire; the first set of connection lines and the second set of connection lines are led out from both ends of the protective housing (4) and welded to the corresponding conductors drawn from both ends of the cut-off cable core (2); each set of detectors is connected in parallel to the corresponding detector control acquisition line.

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