Wave velocity instrument cable protection device and method

Abstract

The invention discloses a wave velocity instrument cable protection device and method, and belongs to the technical field of engineering investigation and detection.The wave velocity instrument cable protection device comprises a protection triangular cone which is of a circumferential splicing and buckling structure and comprises at least two petal bodies, and the petal bodies are buckled to form a conical protection body; alignment limiting structures which are embedded with each other are arranged on the attaching faces between the adjacent petal bodies. An arc-shaped groove is formed in the inner side of each petal body, and when the petal bodies are in a buckled state, the arc-shaped grooves define a composite arc-shaped groove which is through in the axial direction of the conical protection main body; the steel wire rope and a to-be-protected wave velocity instrument cable are attached in parallel, and the steel wire rope and the to-be-protected wave velocity instrument cable are jointly embedded in the composite arc-shaped groove; half screw rod sections are arranged at the corresponding positions of the adjacent petal bodies, and when the petal bodies are in a buckled state, the half screw rod sections on the same side of the adjacent petal bodies are in butt joint to form a locking screw rod; the locking assembly comprises a locknut, and the locknut is in threaded fit with the locking screw to lock the petal bodies; and the elastic buffer ring is arranged at the bottom edge of the protective triangular cone.

Description

Technical Field

[0001] This invention belongs to the field of engineering survey and testing technology, specifically relating to a cable protection device and method for wave velocity instruments. Background Technology

[0002] Wave velocity testing is a key technology in the field of engineering geological exploration for obtaining the propagation velocity of elastic waves in the formation. By lowering the excitation source and test probe to a specified depth in the borehole, the test signal is transmitted through the wave velocity instrument cable connecting the probe and the ground host, thereby analyzing the mechanical properties and distribution characteristics of the formation and providing core geological parameters for engineering design and construction.

[0003] In actual wave velocity testing operations, the drilling environment is complex and variable, generally containing loose strata such as clay, sand, and gravel. Soil and rock fragments are prone to detachment from the borehole wall. Simultaneously, the probe and excitation source are susceptible to friction and collision with the borehole wall during the lifting and lowering process, leading to multiple risks of damage to the wave velocity instrument cable. Specific problems are as follows: 1. Cable jamming and pull damage: Soil and rocks falling into the borehole can easily accumulate above the probe, forming a blockage area. When pulling the probe, the cable needs to withstand additional pulling resistance. If the resistance is too great, it can easily cause the cable to stretch and deform, the core wire to break, or the cable and probe joint to fall off, directly interrupting the test operation, causing equipment damage and loss of test data.

[0004] 2. Cable wear and scratches: The borehole wall often contains sharp gravel and rock cuttings. During the lowering and raising of the probe, the cable is continuously rubbed and scratched by the borehole wall and falling rocks, which can easily lead to damage to the cable sheath and exposure of the internal core wire. This not only affects the stability of signal transmission, but may also cause instrument malfunctions due to short circuits in the core wire. At the same time, the damaged cable cannot resist the corrosion of groundwater in the borehole, further shortening its service life.

[0005] 3. Insufficient existing protective measures: Currently, the protection of the cable for the wave speed instrument in the project mostly adopts temporary measures such as simple binding of protective sleeves and wrapping of insulating tape. These methods have low protection strength and cannot effectively resist the impact of stones and continuous friction. Moreover, the fixed reliability of the protective sleeve and the cable is poor, and it is easy to loosen and shift in the borehole, which cannot form a continuous and effective protection. Some solutions that adopt an integrated protective structure have problems such as inconvenient installation and disassembly, inability to flexibly adapt to cable specifications, and the protective structure itself is easy to get stuck in the area of ​​falling soil and stones, which will increase the risk of cable damage.

[0006] 4. Testing efficiency and cost issues: Cable damage requires downtime for cable replacement or equipment repair, which seriously affects the testing progress and increases the construction period; at the same time, the Wavespeed instrument cable is a special test cable, with high procurement and maintenance costs, and frequent damage leads to a significant increase in engineering survey costs.

[0007] In summary, given the technical shortcomings of existing cable protection measures in wave velocity testing, such as poor protection effect, unreliable fixation, inconvenient installation, and increased risk of jamming, developing a wave velocity instrument cable reinforcement device that can effectively resist the impact and friction of rocks in the borehole, achieve stable cable fixation, facilitate installation and disassembly, and adapt to different drilling conditions has become an urgent technical problem to be solved in the current wave velocity testing engineering field. Summary of the Invention

[0008] The purpose of this invention is to overcome the problems of poor protection effect, unreliable fixing, easy cable rotation and misalignment, and inconvenient installation in existing wave velocity testing cable protection measures. This invention proposes a wave velocity instrument cable protection device and method.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a cable protection device for a wave speed instrument, including a protective triangular cone, a steel wire rope, a locking assembly, and an elastic buffer ring; The protective triangular cone has a circumferentially splicing and snap-fit ​​structure, including at least two valves, which snap together to form a cone-shaped protective body; the mating surfaces between adjacent valves are provided with mutually interlocking alignment and limiting structures; Each valve body has an arc-shaped groove on its inner side. When the valve bodies are in the snap-fit ​​state, the arc-shaped grooves together form a composite arc-shaped groove that runs through the axial direction of the conical protective body. The steel wire rope is installed parallel to and attached to the wave velocity instrument cable to be protected, and the steel wire rope and the wave velocity instrument cable to be protected are embedded together in the composite arc groove. Each adjacent valve body has a half-screw section at the corresponding position. When each valve body is in the snap-fit ​​state, the half-screw sections on the same side of the adjacent valve bodies are connected to form a locking screw. The locking assembly includes a lock nut, which engages with the locking screw to lock each segment. An elastic buffer ring is placed at the bottom edge of the protective triangular cone.

[0010] Furthermore, there are two valves, both of which are semi-conical structures with identical designs.

[0011] Furthermore, there are three or more valves, each evenly distributed along the circumference of the conical protective body.

[0012] Furthermore, the protective triangular pyramid has a single-cone structure.

[0013] Furthermore, the alignment and limiting structure includes at least one pair of axially extending alignment bosses and alignment grooves that correspond one-to-one with the alignment bosses and are shape-fitted. The alignment boss is integrally formed on the mating surface of one of the two adjacent valve bodies, and the alignment groove is opened on the mating surface of the other of the two adjacent valve bodies. The alignment boss is fitted into the alignment groove to form a radial anti-torsional limiting structure.

[0014] Furthermore, the composite arc groove is a double arc-shaped locking groove, and the inner wall of the composite arc groove is provided with a frosted anti-slip surface.

[0015] Furthermore, each petal is provided with a semi-screw section at the top and bottom. When the petals are fastened together, the semi-screw sections on the same side of adjacent petals are joined together to form two sets of coaxial locking screws at the top and bottom. The connection between the locking screw and the valve body is provided with an arc transition structure.

[0016] Furthermore, the locking screw is made of fiberglass, and the anti-loosening nut is a nylon insert anti-loosening nut; The valve body is made of glass fiber reinforced plastic; The elastic buffer ring is a ring-shaped body made of polyurethane. The inner diameter of the elastic buffer ring is the same as the outer diameter of the bottom edge of the protective triangular pyramid. The elastic buffer ring is bonded to the bottom edge of the protective triangular pyramid.

[0017] Furthermore, the wire rope is a hot-dip galvanized steel core wire rope; One end of the wire rope extends to the top surface of the protective triangular cone and is locked in place by the anti-loosening nut simultaneously with the locking screw; The other end of the steel wire rope extends to the joint between the wave velocity instrument cable to be protected and the test probe, and is fixed by crimping with a crimping tube. The length of the steel wire rope is greater than the length of the wave velocity instrument cable to be protected.

[0018] Secondly, the present invention provides a method for protecting a wave speed instrument cable, using a wave speed instrument cable protection device, comprising the following steps: The elastic buffer ring is pre-positioned at the corresponding position at the bottom edge of each valve of the protective triangular cone; The steel wire rope is attached parallel to the axial direction of the wave velocity instrument cable to be protected, forming a cable assembly. Each petal is circumferentially surrounded on the outside of the cable assembly. The alignment and fitting of adjacent petals are completed by the alignment and limiting structure, so that each petal snaps together to form a conical protective body. Simultaneously, the locking screw is connected and the composite arc groove is closed, and the cable assembly is embedded in the composite arc groove. Engage the anti-loosening nut with the threaded locking screw after docking to lock and fix each petal, so that the conical protective body is tightly fixed to the outer periphery of the cable assembly, thus completing the assembly of the protective device; The assembled protective device is lowered to the target borehole along with the wave velocity instrument cable, and then pulled up and retrieved after the wave velocity test is completed.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects: This invention proposes a cable protection device for a wave velocity instrument, employing a circumferentially splicing and snap-fit ​​petal structure. It eliminates the need for threading through the cable end, allowing direct assembly at the target location. The petal snap-fit ​​simultaneously engages the locking screw, and with the help of the anti-loosening nut, rapid locking and fixation are achieved. This convenient and efficient assembly and disassembly caters to the demands of rapid on-site operations. The overall conical protective structure effectively resists impacts from falling rocks within the borehole. During lowering and lifting, the conical guide pushes away debris to prevent obstruction. Combined with the elastic buffer ring at the bottom, it further cushions impacts and reduces friction, providing comprehensive protection for the cable and test probe. The alignment and limiting structure of adjacent petal contact surfaces ensures precise petal alignment while simultaneously forming radial anti-torsional limiting, preventing damage during operation. The misalignment and rotation of the middle petal, combined with the composite arc groove formed by the enclosure, stably holds the cable assembly, preventing relative sliding between the device and the cable and ensuring the protective position remains unchanged. The threaded locking structure of the anti-loosening nut and locking screw can adapt to the vibration conditions inside the borehole, effectively preventing the locking structure from loosening, ensuring overall stability and reliability. The steel wire rope, parallel and closely attached to the cable, effectively distributes the tension borne by the cable during lowering and lifting, preventing the cable from breaking. At the same time, the device can completely enclose and isolate the cable, preventing it from directly rubbing and impacting the borehole wall and gravel, significantly extending the cable's service life. In addition, the petal body can be flexibly selected in different splicing forms such as two-petal or multi-petal, adapting to the operational needs of cables of different diameters and borehole specifications, with strong adaptability and wide applicability. This invention can effectively resist the impact and friction of rocks inside the borehole, achieve stable cable fixation, facilitate installation and disassembly, and adapt to different drilling conditions. It solves the problems of poor protection effect, unreliable fixation, easy cable rotation and misalignment, and inconvenient installation in existing wave velocity testing cable protection measures for wave velocity instruments. Attached Figure Description

[0020] The accompanying drawings are provided to further understand the invention and constitute a part of this invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0021] Figure 1 This is a schematic diagram of the overall assembly structure of the present invention when used for wave velocity testing.

[0022] Figure 2 This is a schematic diagram of the left half-cone in the embodiment.

[0023] Figure 3 This is a schematic diagram of the right half-cone in the embodiment.

[0024] Figure 4 Cross-sectional view of the composite arc groove for the protective triangular pyramid.

[0025] Figure 5This is a schematic diagram of a fiberglass screw.

[0026] Figure 6 This is a schematic diagram of a nylon insert anti-loosening nut.

[0027] Figure 7 This is one of the schematic diagrams of the installation structure of a polyurethane elastic buffer ring.

[0028] Figure 8 The second schematic diagram shows the installation structure of the polyurethane elastic buffer ring.

[0029] Among them, 1 is a protective triangular cone; 11 is the left half cone; 12 is the right half cone; 13 is the alignment boss; 14 is the alignment groove; 15 is the composite arc groove; 16 is the upper end face; 2 is the steel wire rope; 31 is the fiberglass screw; 32 is the nylon insert anti-loosening nut; 4 is the buffer ring. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0031] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] It should be noted that the terms "first," "second," etc., in the specification and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, apparatus, method, product, or device that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, apparatus, products, or devices.

[0034] Example 1 A protective device for a wave speed instrument cable includes a protective triangular cone, a steel wire rope, a locking assembly, and an elastic buffer ring; The protective triangular cone features a circumferentially interlocking structure, comprising at least two segments that interlock to form the cone-shaped protective body. Employing a modular design rather than a single piece, it can be directly wrapped around the outside of cables without needing to be inserted through the cable end, making installation and disassembly more convenient. The cone-shaped structure is suitable for drilling operations, reducing obstruction and resisting rock impacts. The mating surfaces between adjacent segments feature interlocking alignment and limiting structures; this ensures precise alignment when multiple segments are assembled, preventing misalignment or displacement, and also preventing relative rotation of the assembled segments, thus guaranteeing structural stability during downhole operations.

[0035] Each petal has an arc-shaped groove on its inner side. When the petals are snapped together, the arc-shaped grooves together form a composite arc-shaped groove that runs through the axial direction of the conical protective body. Each separate petal has a semi-open arc-shaped groove. When assembled, they form a complete, vertically connected closed groove, which is a core structure specifically designed to accommodate and wrap cables and wire ropes.

[0036] The steel wire rope is installed parallel to and attached to the cable of the wave velocity instrument to be protected, and the steel wire rope and the cable of the wave velocity instrument to be protected are embedded together in the composite arc groove; the core function of the steel wire rope is to share the lifting force of the cable, prevent the cable from being pulled apart, and at the same time assist in fixing the entire protective device.

[0037] Each adjacent petal has a half-screw section at the corresponding position. When the petals are engaged, the half-screw sections on the same side of the adjacent petals are joined together to form a locking screw. Each split petal has a pre-fabricated half-screw structure. After the adjacent petals are assembled, the two half-screws are just enough to form a complete locking screw that can be tightened with a nut. No additional welding or drilling is required, resulting in a stronger structural integrity and easier installation.

[0038] The locking assembly includes an anti-loosening nut, which engages with the locking screw to lock each segment; the nut and the splicing screw threadedly lock all the separate segments firmly; the anti-loosening nut can prevent the nut from loosening due to vibration in the borehole, ensuring that the device will not fall apart during downhole operations.

[0039] An elastic buffer ring is installed at the bottom edge of the protective triangular cone. The core function of the elastic buffer ring installed at the bottom of the protective triangular cone is to buffer the impact of the device with the hole wall and rocks when it is lowered and pulled up. At the same time, it prevents the hard edge of the protective cone from scratching the hole wall and causing jamming, and also reduces hard collisions between the device and the test probe.

[0040] There are two valves, both of which are identical semi-conical structures. This two completely symmetrical semi-conical split structures represent the simplest assembly method; installation simply requires aligning the two semi-cones, making it extremely convenient and suitable for most conventional drilling conditions.

[0041] The device has three or more petals, which are evenly distributed along the circumference of the conical protective body. After assembly, the clamping force on the cable is more uniform, and the impact and deformation resistance is stronger, making it suitable for harsh working conditions such as large-diameter cables, deep holes, and areas with a lot of gravel.

[0042] The protective triangular cone has a single-cone structure. The cone tip faces upward (towards the cable lifting end), and when lowering or lifting, it can push away gravel along the cone surface to avoid obstruction. At the same time, it can provide full-coverage top protection for the cable and probe below, resisting the impact of falling stones above.

[0043] The alignment and limiting structure includes at least one pair of axially extending alignment bosses and alignment grooves that correspond one-to-one with the alignment bosses and are shape-fitted; it adopts a boss + groove interlocking structure, and the bosses and grooves extend along the axial direction (up and down direction) of the cone to ensure that the upper and lower parts can be accurately aligned throughout the entire process during assembly, and there will be no misalignment.

[0044] The alignment boss is integrally formed on the mating surface of one of the two adjacent valve bodies, and the alignment groove is formed on the mating surface of the other of the two adjacent valve bodies. The alignment boss is fitted into the alignment groove to form a radial anti-torsional limiting structure. Both are made on the mating surfaces of adjacent valve bodies. When assembled, the boss is engaged with the groove, which can completely restrict the radial rotation and lateral misalignment between the valve bodies, ensuring that the structure will not fall apart or misalign when subjected to impact or vibration.

[0045] The composite arc groove is a double-arc locking groove with a frosted anti-slip surface on its inner wall. The double arc groove can be adapted to fit round cables and wire ropes separately, achieving individual locking and preventing movement; the frosted inner wall increases friction, preventing the device from sliding up and down between the device and the cable, and ensuring that the protective position does not shift.

[0046] Each valve body has a semi-screw section at the top and bottom. When the valve bodies are fastened together, the semi-screw sections on the same side of adjacent valve bodies are joined together to form two sets of coaxial locking screws at the top and bottom. The simultaneous locking at both places can make the clamping force of the valve bodies more uniform, and will not result in a situation where one end is loose and the other end is tight, making the locking effect more reliable.

[0047] The connection between the locking screw and the valve body features a rounded transition structure. This disperses stress during locking and impact, preventing stress concentration at the screw root and subsequent breakage, thus improving the overall structural strength and service life.

[0048] The locking screw is made of fiberglass, which is non-conductive and does not affect the wave velocity test signal. It is also high in strength and corrosion-resistant, making it suitable for wet and muddy working conditions downhole. The anti-loosening nut is a nylon insert anti-loosening nut. It has a built-in anti-loosening effect and does not require an additional anti-loosening washer, which can effectively prevent the nut from loosening due to drilling vibration.

[0049] The valve body is made of glass fiber reinforced plastic; this material is lightweight, high-strength, corrosion-resistant, and non-conductive, so it will not interfere with the electrical signal of the wave velocity test. At the same time, it has good impact resistance and can effectively resist the impact of rocks, making it suitable for the harsh working conditions inside the borehole.

[0050] The elastic buffer ring is a ring-shaped body made of polyurethane. The inner diameter of the elastic buffer ring is the same as the outer diameter of the bottom edge of the protective triangular cone, and the elastic buffer ring is bonded to the bottom edge of the protective triangular cone. Polyurethane material has good elasticity, impact resistance, and wear resistance, making it suitable for frequent impact and friction conditions; its size is perfectly matched to the cone bottom, and it can completely wrap around the edge of the cone bottom; the bonded fixation ensures that the buffer ring will not fall off when subjected to impact and friction downhole.

[0051] The wire rope is a hot-dip galvanized steel core wire rope; the hot-dip galvanizing treatment can prevent rust and corrosion, and is suitable for working conditions in damp and muddy conditions underground; the steel core wire rope has high strength and high breaking tensile strength, and can reliably share the lifting force of the cable and prevent the cable from being pulled apart.

[0052] One end of the wire rope extends to the top of the protective cone and is locked in place by the anti-loosening nut along with the locking screw. The upper end of the wire rope is locked together with the locking screw of the protective cone by the nut, which allows the wire rope and the protective cone to form a whole. When lifting, the pulling force is directly borne by the wire rope, without pulling the cable, and at the same time, it ensures that the protective cone will not slip on the wire rope.

[0053] The other end of the steel wire rope extends to the joint between the cable of the wave velocity instrument to be protected and the test probe, and is secured by a crimping tube. The length of the steel wire rope is greater than the length of the cable of the wave velocity instrument to be protected. The lower end of the steel wire rope is crimped together with the cable-probe joint, which can protect the most vulnerable joint part of the cable throughout the entire process. At the same time, when pulling, the tension is directly transmitted to the probe through the steel wire rope, without pulling the cable. The longer length provides a connection margin to adapt to different test depths, while also preventing the cable from being pulled apart first by the stress.

[0054] Example 2 A method for protecting the cable of a wave velocity instrument includes the following steps: The elastic buffer ring is pre-positioned at the corresponding position at the bottom edge of each valve of the protective triangular cone; The steel wire rope is attached parallel to the axial direction of the wave velocity instrument cable to be protected, forming a cable assembly. Each petal is circumferentially surrounded on the outside of the cable assembly. The alignment and fitting of adjacent petals are completed by the alignment and limiting structure, so that each petal snaps together to form a conical protective body. Simultaneously, the locking screw is connected and the composite arc groove is closed, and the cable assembly is embedded in the composite arc groove. Engage the anti-loosening nut with the threaded locking screw after docking to lock and fix each petal, so that the conical protective body is tightly fixed to the outer periphery of the cable assembly, thus completing the assembly of the protective device; The assembled protective device is lowered to the target borehole along with the wave velocity instrument cable, and then pulled up and retrieved after the wave velocity test is completed.

[0055] Specifically: S1 Pre-assembly preparation: Set the elastic buffer ring at the corresponding position of the bottom edge of each petal, so that after each petal is snapped together, the elastic buffer ring completely surrounds the bottom edge of the formed conical protective body; S2 cable pre-layout: The steel wire rope and the wave speed instrument cable to be protected are attached parallel to each other along the axial direction to form a cable assembly; S3 Protective Body Alignment and Assembly: Each petal is circumferentially surrounded on the outside of the cable assembly, so that the cable assembly is embedded in the arc-shaped groove inside each petal; the alignment and fitting of adjacent petals is completed by the alignment and limiting structure of the contact surface of adjacent petals, so that each petal is snapped together to form a conical protective body. At the same time, the half-screw sections at the corresponding positions of adjacent petals are connected to form a locking screw. The arc-shaped grooves of each petal are surrounded to form a composite arc-shaped groove that runs through the axial direction of the conical protective body. The cable assembly is embedded in the composite arc-shaped groove. S4 Locking and Fixing: Connect the anti-loosening nut to the locking screw after docking, and lock and fix each petal by locking the anti-loosening nut, so that the conical protective body is tightly fixed to the outside of the cable assembly, and the assembly of the protective device is completed; S5 Drilling Operation Protection: The wave velocity instrument cable equipped with the protection device is lowered into the target borehole to perform wave velocity testing. After the operation is completed, the cable and protection device are pulled up and retrieved.

[0056] In steps S1 to S4, two valves are used. The two valves are semi-conical structures with the same structure. The two semi-conical structures are interlocked to form a conical protective body.

[0057] In steps S1 to S4, three or more valves are used, and each valve is evenly distributed along the circumference of the conical protective body, forming a conical protective body by surrounding and fastening each other.

[0058] In step S3, the cone-shaped protective body is a single cone structure, and the cone tip is set in the opposite direction of the cable lowering direction when it is fastened.

[0059] In step S3, the alignment limiting structure includes at least a pair of axially extending alignment bosses and alignment grooves that correspond one-to-one with the alignment bosses and are adapted in shape; during alignment and fitting, the alignment bosses integrally formed on the mating surface of one of the two adjacent valve bodies are fitted into the alignment grooves on the mating surface of the other of the two adjacent valve bodies to form radial anti-torsional limiting.

[0060] In step S3, the composite arc groove is a double arc-shaped locking groove. The inner wall of the composite arc groove is provided with a frosted anti-slip surface. When the cable assembly is embedded in the composite arc groove, it fits tightly with the frosted anti-slip surface.

[0061] In step S3, each petal body has a semi-screw section at the top and bottom. When the petals are fastened together, the semi-screw sections on the same side of adjacent petals are joined together to form two sets of coaxial locking screws at the top and bottom. The connection between the locking screw and the petal body is provided with an arc transition structure.

[0062] In step S4, the locking screw is made of fiberglass, and the anti-loosening nut is a nylon insert anti-loosening nut.

[0063] In steps S1 to S4, the valve body is made of glass fiber reinforced plastic.

[0064] In step S1, the elastic buffer ring is an annular ring made of polyurethane. The inner diameter of the elastic buffer ring is the same as the outer diameter of the bottom edge of the conical protective body. The elastic buffer ring is bonded and fixed to the bottom edge of the conical protective body.

[0065] In step S2, the wire rope is a hot-dip galvanized steel core wire rope; in step S4, one end of the wire rope extends to the top surface of the conical protective body and is locked by the anti-loosening nut simultaneously with the locking screw; the other end of the wire rope extends to the joint between the wave velocity instrument cable to be protected and the test probe, and is fixed by crimping with a crimping tube, and the length of the wire rope is greater than the length of the wave velocity instrument cable to be protected.

[0066] Example 3 This embodiment uses a protective triangular cone consisting of two identical semi-cones as an example to illustrate a wave speed instrument cable protection device, which includes a protective triangular cone, a steel wire rope, a fiberglass screw and nut assembly, and a polyurethane elastic buffer ring. This structure can form a cable protection device that can effectively resist the impact and friction of rocks in the borehole, achieve stable cable fixation, facilitate installation and disassembly, and adapt to different drilling conditions.

[0067] This embodiment is adapted to conventional drilling conditions and is designed for the cable of a wave velocity instrument. The core components include a protective triangular cone 1, a steel wire rope 2, a fiberglass screw and nut assembly, and a polyurethane elastic buffer ring 4. The specific structure, corresponding figures, and assembly method of each component are as follows: I. Specific Structure of Each Core Component 1. Protective triangular pyramid structure, such as Figure 2 , Figure 3 , Figure 4 As shown; Combination Figure 2 , Figure 3 As shown, the protective triangular cone 1 is a split-locking single-cone structure, including a left half-cone 11 and a right half-cone 12. The two structures are completely symmetrical and form a complete structure when locked together. Figure 1 The complete conical protective body is shown. The protective triangular cone 1 is made of fiberglass reinforced plastic (FRP) and is integrally molded using a mold. The cone tip is set upwards, and the cone surface tilt angle is 50°. This tilt angle allows the device to quickly pass through the rock accumulation area when lowering and pulling it out of the borehole, avoiding jamming. The protective triangular cone 1 has a wall thickness of 4~6mm. After being fastened, the bottom diameter covers the maximum outer diameter of the matching test probe, which can fully cover the area above the probe to achieve the protection function. The upper side of the protective triangular cone 1 is a flat upper end surface 16 to prevent scratching the borehole wall and the wave velocity instrument cable during lowering.

[0068] Combination Figure 2 , Figure 3 As shown, the mating surface of the left half-cone 11 is integrally formed with two pairs of vertical alignment bosses 13, and the mating surface of the right half-cone 12 is correspondingly provided with two pairs of vertical alignment grooves 14. The dimensions of the alignment bosses 13 are 5mm wide × 2mm high. The dimensions and shape of the alignment grooves 14 are precisely matched with the alignment bosses 13. When fastened, the alignment bosses 13 can be seamlessly embedded in the alignment grooves 14 to form a rigid anti-torsional limit, thereby realizing the radial positioning between the left half-cone 11 and the right half-cone 12 and preventing them from rotating relative to each other around the combined central axis of the wave speed instrument cable and the wire rope 2.

[0069] Combination Figure 4As shown, the inner sides of both the left half-cone 11 and the right half-cone 12 are integrally formed with semi-arc composite grooves, which, when fastened together, form a complete vertical composite arc groove 15. The composite arc groove 15 has a double arc-shaped locking structure, ensuring that the wave speed instrument cable and the steel wire rope 2 can be tightly embedded in the groove; the inner wall of the composite arc groove 15 is a frosted anti-slip surface with a roughness of Ra3.2μm, which can improve the tightness of the fit with the cable sheath and the outer wall of the steel wire rope 2, and prevent radial slippage. At the same time, it works with the alignment boss 13 and the alignment groove 14 to form a double radial positioning between the protective triangular cone 1 and the combined central axis, which is the core design of this invention.

[0070] 2. Fiberglass screw and nut assembly structure, such as Figure 5 , Figure 6 As shown; Combination Figure 5 , Figure 6 As shown, the fiberglass screw and nut assembly is the core fixing component of the device, including two sets of coaxially arranged fiberglass screws 31 and matching nylon insert anti-loosening nuts 32. The fiberglass screws 31 are integrally molded with the left half-cone 11 and right half-cone 12 of the protective triangular cone 1. Figure 2 , Figure 3 The upper and lower parts of the left half-cone 11 and the right half-cone 12 are respectively provided with half-screw structures. After being fastened, the half-screws on the same side are precisely connected to form a complete fiberglass screw 31 without any connection gaps, which improves the overall strength of the structure.

[0071] The fiberglass screw 31 uses a coarse thread specification; the connection between the fiberglass screw 31 and the cone of the protective triangular pyramid 1 adopts a large arc transition connection. Figure 5 It can disperse the stress during locking and impact, and prevent root breakage. The nylon insert anti-loosening nut 32 is pre-installed at the joint between the wave speed instrument cable and the steel wire rope 2, and is used for subsequent locking and fixing of the left half cone 11 and the right half cone 12. Its nylon insert structure can effectively prevent loosening caused by drilling vibration.

[0072] 3. Steel wire rope structure 2, such as Figure 1 As shown; Combination Figure 1 As shown, wire rope 2 is made of hot-dip galvanized steel core wire rope with a 7×19 strand core structure, a diameter of 4.0~8mm, and a breaking tensile strength ≥7.8kN, combining high strength with good flexibility. Wire rope 2 is installed parallel to and attached to the wave speed instrument cable, both embedded in the composite arc groove 15 of the protective triangular pyramid 1. Figure 4One end of the steel wire rope 2 extends to the upper end face 16 of the protective triangular cone 1, and is locked in place by the nylon insert anti-loosening nut 32 simultaneously with the fiberglass screw 31; the other end extends to the joint between the wave speed instrument cable and the test probe, and is fixed by crimping with an aluminum compression fitting, which can effectively share the tension borne by the cable during the lifting process. In addition, the extension length of the steel wire rope 2 is 0.5m longer than the wave speed instrument cable, leaving sufficient connection slack to adapt to different testing depth requirements.

[0073] 4. Polyurethane elastic buffer ring structure, such as Figure 7 , Figure 8 As shown; Combination Figure 7 , Figure 8 As shown, the polyurethane elastic buffer ring 4 is made of high-strength polyurethane, 5mm thick, with a Shore hardness of 65HA, possessing both excellent elasticity and impact resistance. Its inner diameter precisely matches the outer diameter of the bottom edge of the protective triangular cone 1, and it is fixed to the bottom edge of the protective triangular cone 1 by epoxy resin adhesive, ensuring that it will not fall off under drilling impact conditions; the surface of the buffer ring is polished smooth, without any protrusions, to prevent it from getting stuck on the hole wall when lowered or lifted.

[0074] Many embodiments and applications beyond the examples provided will be apparent to those skilled in the art upon reading the foregoing description. Therefore, the scope of this teaching should not be determined by reference to the foregoing description, but rather by reference to the foregoing and the full scope of its equivalents. For purposes of completeness, all articles and references, including disclosures in patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein is not intended as a waiver of that subject matter, nor should it be construed as an indication that the applicant has not considered that subject matter as part of the disclosed inventive subject matter.

[0075] The above content provides a further detailed description of the present invention. It should not be construed that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the scope of protection claimed by the present invention.

Claims

1. A wave velocity instrument cable guard, comprising: Includes protective cones, steel wire ropes, locking components, and elastic buffer rings; The protective triangular cone is a circumferentially splicing and snap-fit ​​structure, including at least two valves, each valve snapping together to form a cone-shaped protective body; the mating surfaces between adjacent valves are provided with mutually interlocking alignment and limiting structures; Each of the valve bodies has an arc-shaped groove on its inner side. When each of the valve bodies is in a snap-fit ​​state, the arc-shaped grooves together form a composite arc-shaped groove that runs through the axial direction of the conical protective body. The steel wire rope is installed parallel to and attached to the wave velocity instrument cable to be protected, and the steel wire rope and the wave velocity instrument cable to be protected are embedded together in the composite arc groove. Each of the adjacent petals is provided with a semi-screw section at the corresponding position. When each petal is in the snap-fit ​​state, the semi-screw sections on the same side of the adjacent petals are joined together to form a locking screw. The locking assembly includes an anti-loosening nut, which is threadedly engaged with the locking screw to lock each of the petals; The elastic buffer ring is located at the bottom edge of the protective triangular cone.

2. A wave velocity instrument cable protection device according to claim 1, wherein, The valve body is provided in two parts, and the two valve bodies are semi-conical structures with the same structure.

3. The wave velocity instrument cable protection device according to claim 1, characterized in that, The valve body is provided in three or more parts, and each valve body is evenly distributed along the circumference of the conical protective body.

4. The wave velocity instrument cable protection device according to claim 1, characterized in that, The protective triangular pyramid has a single-cone structure.

5. A wave velocity instrument cable protection device according to claim 1, characterized in that, The alignment and limiting structure includes at least one pair of axially extending alignment bosses and alignment grooves that correspond one-to-one with the alignment bosses and are adapted in shape. The alignment boss is integrally formed on the mating surface of one of the two adjacent valve bodies, and the alignment groove is formed on the mating surface of the other of the two adjacent valve bodies. The alignment boss is fitted into the alignment groove to form a radial anti-torsional limiting structure.

6. The wave velocity instrument cable protection device according to claim 1, characterized in that, The composite arc groove is a double arc-shaped positioning groove, and the inner wall of the composite arc groove is provided with a frosted anti-slip surface.

7. A wave velocity instrument cable protection device according to claim 1, characterized in that, Each of the valves is provided with a semi-screw section at the top and bottom. When the valves are fastened together, the semi-screw sections on the same side of adjacent valves are connected to form two sets of coaxial locking screws at the top and bottom. The connection between the locking screw and the petal body is provided with an arc transition structure.

8. A wave velocity instrument cable protection device according to claim 1, characterized in that, The locking screw is made of fiberglass, and the anti-loosening nut is a nylon insert anti-loosening nut. The valve body is made of glass fiber reinforced plastic. The elastic buffer ring is an annular ring made of polyurethane. The inner diameter of the elastic buffer ring is the same as the outer diameter of the bottom edge of the protective triangular pyramid. The elastic buffer ring is bonded to the bottom edge of the protective triangular pyramid.

9. A wave velocity instrument cable protection device according to claim 1, characterized in that, The wire rope is a hot-dip galvanized steel core wire rope; One end of the steel wire rope extends to the top surface of the protective triangular cone and is locked by the anti-loosening nut simultaneously with the locking screw; The other end of the steel wire rope extends to the joint between the wave velocity instrument cable to be protected and the test probe, and is fixed by crimping with a crimping tube. The length of the steel wire rope is greater than the length of the wave velocity instrument cable to be protected.

10. A method for protecting the cable of a wave velocity instrument, characterized in that, Using a wave velocity instrument cable protection device according to any one of claims 1-9 includes the following steps: The elastic buffer ring is pre-positioned at the corresponding position at the bottom edge of each valve of the protective triangular cone; The steel wire rope is attached parallel to the axial direction of the wave velocity instrument cable to be protected, forming a cable assembly. Each petal is circumferentially surrounded on the outside of the cable assembly. The alignment and fitting of adjacent petals are completed by the alignment and limiting structure, so that each petal snaps together to form a conical protective body. Simultaneously, the locking screw is connected and the composite arc groove is closed, and the cable assembly is embedded in the composite arc groove. Engage the anti-loosening nut with the threaded locking screw after docking to lock and fix each petal, so that the conical protective body is tightly fixed to the outer periphery of the cable assembly, thus completing the assembly of the protective device; The assembled protective device is lowered to the target borehole along with the wave velocity instrument cable, and then pulled up and retrieved after the wave velocity test is completed.

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