A static penetration device for use in a drill pipe of a submarine drilling rig

Abstract

The present invention belongs to the field of marine geological exploration technology, and relates to a static penetration device used in a drill pipe of a submarine drilling rig. The device includes a hoisting mechanism, a driving mechanism, a screw nut transmission mechanism, and a static penetration probe; the hoisting mechanism includes a central axis, a spring-clip mechanism, and a suspension ring connected to the lower end of the central axis, the suspension ring is crimped onto a seat ring in the drill pipe, the spring-clip mechanism is wound around the central axis and can be expanded outward or shrunk inward under the action of an external force to achieve a detachable connection between the static penetration device and the drill pipe; the driving mechanism includes a motor installed in a sealed cabin; the input end of the screw nut transmission mechanism is connected to the motor output shaft, and the output end is connected to the static penetration probe to convert the rotational motion of the motor output shaft into the axial linear motion of the static penetration probe. The present invention realizes the application of the static penetration device in the drill pipe, so that the submarine drilling rig expands the static penetration function on the basis of the original drilling and sampling function, and reduces the cost of marine geological exploration.

Description

Technical Field

[0001] The invention belongs to the technical field of marine geological exploration, and in particular relates to a static penetration device used in a drill pipe of a seabed drilling rig. Background Art

[0002] Cone penetration testing (CPT) refers to the use of a pressure device to press a probe rod with a probe into the test soil. By measuring the penetration resistance of the soil through the measurement system, some basic physical and mechanical properties of the soil, such as the deformation modulus of the soil and the allowable bearing capacity of the soil, can be determined. It is now widely used in marine geological exploration. The seabed drilling rig is a drilling and sampling equipment that works completely on the seabed. When working underwater, the seabed drilling rig is connected to the carrier ship through a load-bearing umbilical cable for remote energy supply and communication control.

[0003] Existing static penetration devices and seabed drilling rigs are both separate devices, and both have only their own independent functions. Currently, seabed drilling rigs cannot meet the dual functional requirements of drilling sampling and static penetration measurement, resulting in high costs for marine geological exploration. Summary of the invention

[0004] In view of the deficiencies existing in the related technologies, the present invention provides a static penetration device for use in a drill pipe of a seabed drilling rig, aiming to enable the seabed drilling rig to expand the static penetration function on the basis of the original drilling and sampling function, thereby reducing the cost of marine geological exploration.

[0005] The present invention provides a static penetration device for use in a drill pipe of a submarine drilling rig, wherein the static penetration device is detachably connected to the drill pipe of the submarine drilling rig; the drill pipe comprises a spring-loaded retaining tube, a spring-loaded chamber, an outer tube and a drill bit which are sequentially connected from top to bottom, a seat ring is embedded in one end of the outer tube close to the spring-loaded chamber, and the inner diameter of the seat ring is smaller than the inner diameter of the drill pipe; the static penetration device comprises a hanging mechanism, a driving mechanism, a screw nut transmission mechanism and a static penetration probe; wherein,

[0006] The hanging mechanism includes a central axis, a spring-cage mechanism, an armored cable connector and a suspension ring respectively connected to the upper and lower ends of the central axis; the outer diameter of the suspension ring is larger than the inner diameter of the seat ring, and the suspension ring is pressed on the top surface of the seat ring; the spring-cage mechanism is wound around the central axis, and the spring-cage mechanism can be expanded outwards to be engaged with the spring-cage chamber or contracted inwards to be separated from the spring-cage chamber under the action of external force, so as to realize a detachable connection between the static penetration device and the drill pipe;

[0007] The driving mechanism includes a sealed cabin and a motor installed inside the sealed cabin, wherein the sealed cabin is connected to the lower part of the central axis; the output shaft of the motor penetrates the sealed cabin and extends downward;

[0008] The input end of the screw-nut transmission mechanism is connected to the motor output shaft, and the output end thereof is connected to the static penetration probe; the screw-nut transmission mechanism is configured to convert the rotational motion of the motor output shaft into the axial linear motion of the static penetration probe.

[0009] The above technical solution realizes the integrated application of the static penetration device in the drill pipe and realizes the detachable connection between the two, so that the seabed drilling rig has the static penetration function on the basis of the original drilling and sampling function. Therefore, the same seabed drilling rig can be used for alternating cycles of drilling sampling and static penetration measurement, which significantly reduces the cost of marine geological exploration.

[0010] In some embodiments, the screw-nut transmission mechanism includes a guide cylinder and a screw, a nut and a penetration cylinder located in the guide cylinder; the guide cylinder is connected to the bottom of the sealed cabin, and an axially extending guide groove is provided on the cylinder wall of the guide cylinder; the upper end of the screw is connected to the motor output shaft; the nut is screwed on the screw, and the nut is connected to a guide plate inserted in the guide groove; the penetration cylinder is sleeved outside the screw, and the upper end of the penetration cylinder is connected to the nut, and the lower end is connected to the static penetration probe. This technical solution can convert the rotational motion of the motor output shaft into the axial linear motion of the static penetration probe.

[0011] In some embodiments, the static penetration device further includes a bevel gear transmission mechanism, which includes a first bevel gear and a second bevel gear arranged opposite to each other, and two third bevel gears arranged opposite to each other and meshingly connected between the first bevel gear and the second bevel gear, wherein a cavity is enclosed between the first bevel gear, the second bevel gear and the two third bevel gears; the axle of the first bevel gear is connected to the output shaft of the motor, and the axle of the second bevel gear is connected to the upper end of the lead screw. This technical solution realizes the torque transmission between the driving mechanism and the lead screw nut transmission mechanism.

[0012] In some embodiments, an outer cylinder is disposed outside the sealed cabin, and a gap is formed between the outer cylinder and the sealed cabin; the upper end of the outer cylinder is connected to the central axis, and the lower end is connected to the guide cylinder; the central axis, the second bevel gear, and the lead screw are all provided with an axially penetrating inner channel; a short sleeve is inserted into the inner channel of the second bevel gear, and one end of the short sleeve passes through the cavity in the transmission mechanism of the bevel gear set and bends outward to align with the gap between the outer cylinder and the sealed cabin; the cable used for static penetration passes through the inner channel of the central axis, the gap between the outer cylinder and the sealed cabin, the short sleeve, and the inner channel of the lead screw to be connected to the static penetration probe. This technical solution realizes the passage of cables in a narrow space, thereby enabling real-time transmission of static penetration measurement data.

[0013] In some embodiments, the tail of the static sounding probe is connected to a long sleeve, which is inserted into the inner channel of the screw but does not contact it; the cable entering the inner channel of the screw passes through the long sleeve and is connected to the static sounding probe; the cable portion located in the long sleeve is a spiral cable.

[0014] In some of the embodiments, a plurality of straightening rings are installed on the inner wall of the outer tube at intervals along its axial direction, and the outer walls of the outer cylinder body and the guide cylinder are crimped against the straightening rings; a shaft sleeve is embedded in the lower end of the guide cylinder, and the penetration cylinder is inserted into the shaft sleeve and slidably connected thereto.

[0015] In some embodiments, the sealed cabin includes a cabin, a hatch, a piston, and a spring seat; the hatch is sealed and connected to the lower end of the cabin, the spring seat is connected to the upper end of the cabin, and the piston is slidably connected in the cabin between the motor and the spring seat; the cabin between the piston and the hatch is filled with hydraulic oil, and a first compression spring is sandwiched between the piston and the spring seat. This technical solution ensures that the motor that provides driving force for the static penetration device is not damaged by water pressure.

[0016] In some of these embodiments, the motor is a coreless motor.

[0017] In some embodiments, a circle of grooves is provided on the inner wall of the ejection chamber near one end of the ejection blocking tube, and a plurality of axially extending clamping strips are uniformly protruded in the groove along the circumference thereof to divide the groove into a plurality of clamping slots;

[0018] The spring-cage mechanism comprises a connecting tube, a sliding sleeve, and a plurality of spring-cage assemblies which are arranged in sequence from top to bottom; the connecting tube is sleeved on the upper part of the central axis and is slidably connected thereto, and the armored cable connector is connected to the upper end of the connecting tube; the sliding sleeve is sleeved outside the central axis, the upper end of the sliding sleeve is inserted and fixed in the connecting tube, the lower end protrudes outside the connecting tube and is provided with a retaining wall folded inward, the retaining wall is slidably connected to the central axis, and a plurality of axially extending sliding grooves are uniformly opened on the side wall of the sliding sleeve along its circumference; the plurality of spring-cage assemblies are uniformly arranged around the central axis. It is assumed that each spring card assembly includes a spring card claw, a spring card connecting plate and a sliding seat; the sliding seat includes a seat plate and a connecting ear protruding from the seat plate, the seat plate is clamped between the central axis and the sliding sleeve, and the seat plate is slidably connected to the central axis, one end of the connecting ear extends outward through the sliding groove on the sliding sleeve, and a second compression spring is clamped between the extended end of the connecting ear and the connecting tube; one end of the spring card claw is hinged on the central axis, and the other end is rotatably connected to one end of the spring card connecting plate, and the other end of the spring card connecting plate is rotatably connected to the extended end of the connecting ear;

[0019] When the static penetration device is assembled into the drill pipe, the spring-loaded claws are pushed outwards by external force to be engaged in the slot; when the static penetration device is removed from the drill pipe, the spring-loaded claws are retracted inwards by external force to be disengaged from the slot.

[0020] The above technical scheme realizes a detachable connection between the static penetration device and the drill pipe, and realizes the axial limit and circumferential stop limit of the static penetration device in the drill pipe, thereby ensuring that the static penetration probe can accurately and efficiently penetrate the soil to be tested for measurement.

[0021] In some embodiments, the number of the clamping strips in the ejection chamber is four, and the number of the ejection assembly is six. This technical solution ensures that there is always a pair of ejection claws that can be simultaneously limited in the axial direction and the circumferential direction, avoiding the extreme assembly situation where all the ejection claws are stuck on the clamping strips and the same number of ejection claws and ejection assembly may cause the limit failure.

[0022] Based on the above technical scheme, the static penetration device used in the drill pipe of the seabed drilling rig in the embodiment of the present invention realizes the integrated application of the static penetration device in the slender and narrow drill pipe space, and realizes the detachable connection between the two, thereby enabling the seabed drilling rig to expand the static penetration function on the basis of the original drilling and sampling function, so that the same seabed drilling rig can be used for alternating cycles of drilling sampling and static penetration measurement, significantly reducing the cost of marine geological exploration; and it can transmit static penetration measurement data in real time, significantly improving the efficiency of static penetration measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 It is a schematic structural diagram of the static penetration device of the present invention;

[0025] Figure 2 It is a structural longitudinal section view of the static penetration device of the present invention when it is connected to the drill pipe;

[0026] Figure 3 It is a structural schematic diagram of the hanging mechanism in the static penetration device of the present invention;

[0027] Figure 4 It is a structural explosion diagram of the ejection and locking mechanism in the static penetration device of the present invention;

[0028] Figure 5 It is a structural longitudinal section view of the hanging mechanism when the static penetration device of the present invention is connected to the drill pipe;

[0029] Figure 6 It is a cross-sectional view of the structure in which the spring-claw is engaged with the slot when the static penetration device of the present invention is connected to the drill pipe;

[0030] Figure 7 It is a structural longitudinal section view of the driving mechanism and the transmission mechanism of the bevel gear set when the static penetration device of the present invention is connected to the drill pipe;

[0031] Figure 8 It is a structural schematic diagram of the transmission mechanism of the bevel gear set in the static penetration device of the present invention (the short sleeve is not shown);

[0032] Fig. 9 It is a structural longitudinal section view of the screw nut transmission mechanism when the static penetration device of the present invention is connected to the drill pipe;

[0033] Fig.10 It is a structural longitudinal section view of the lifting mechanism when the static penetration device of the present invention is removed from the drill pipe.

[0034] In the figure: 10, drill pipe; 11, spring card retaining tube; 12, spring card chamber; 121, card strip; 122, card slot; 13, outer tube; 14, drill bit; 15, seat ring; 16, straightening ring; 20, static penetration probe; 21, long casing; 22, spiral cable; 30, hanging mechanism; 31, central axis; 311, main axis; 312, first step axis; 313, second step axis; 314, locking ring; 32, spring card mechanism; 321, connecting tube; 322, sliding sleeve; 3221, retaining wall; 3222, sliding groove; 323, spring card assembly; 3231, spring card claw; 3232, spring card connecting plate; 3233, sliding seat; 3234, seat plate; 3235, connecting ear; 324, second pressure compression spring; 33, armored cable connector; 34, suspension ring; 35, locking nut; 40, driving mechanism; 41, sealed cabin; 411, cabin tube; 412, cabin cover; 413, piston; 414, spring seat; 415, first compression spring; 42, motor; 421, motor output shaft; 43, outer cylinder; 50, screw and nut transmission mechanism; 51, guide cylinder; 511, guide groove; 52, screw; 53, nut; 54, penetration cylinder; 55, guide plate; 56, bushing; 57, connecting sleeve; 60, bevel gear set transmission mechanism; 601, cavity; 61, first bevel gear; 62, second bevel gear; 63, third bevel gear; 64, gear seat; 65, short sleeve; 66, bearing. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "up", "down", "top", "bottom", "inside", "outside", "left", "right", "front", "back", "vertical", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] refer to Figure 1-Figure 10 As shown, the present invention provides a static penetration device for use in a drill pipe of a seabed drilling rig. The static penetration device can be detachably connected to a drill pipe 10 of the seabed drilling rig.

[0040] The seabed drilling rig is a drilling and sampling device working on the seabed, and a core tube is installed in the drill pipe 10 for drilling and sampling, and the core tube is detachably connected to the drill pipe 10. Usually, the drill pipe 10 includes a spring-loaded retaining tube 11, a spring-loaded retaining chamber 12, an outer tube 13 and a drill bit 14 connected in sequence from top to bottom; the spring-loaded retaining chamber 12 is provided with a circle of grooves at one end close to the spring-loaded retaining tube 11, and when the core tube is assembled into the drill pipe 10, the claw mechanism on the core tube is stuck in the groove to perform an axial upper limit on the core tube; a seat ring 15 is embedded in one end of the outer tube 13 close to the spring-loaded retaining chamber 12, and the inner diameter of the seat ring 15 is smaller than the inner diameter of the drill pipe 10 but larger than the outer diameter of the main body of the core tube. When the core tube is assembled into the drill pipe 10, the main body of the core tube passes through the seat ring 15 and the positioning ring on the core tube is pressed onto the top surface of the seat ring 15 to perform an axial lower limit on the core tube.

[0041] The static penetration device for use in a drill pipe of a seabed drilling rig of the present invention comprises a hanging mechanism 30, a driving mechanism 40, a screw nut transmission mechanism 50 and a static penetration probe 20 which are sequentially arranged from top to bottom.

[0042] The hanging mechanism 30 includes a central shaft 31, a spring-clip mechanism 32, an armored cable connector 33, and a suspension ring 34. The central shaft 31 is coaxially arranged with the drill pipe 10; specifically, the central shaft 31 includes a main shaft 311, a first step shaft 312, and a second step shaft 313 connected in sequence from top to bottom. The armored cable connector 33 is connected to the upper end of the main shaft 311 of the central shaft 31, and is mainly used to connect the armored cable from the water surface, and the static penetration device can be lifted and recovered from the drill pipe 10 through the armored cable. The suspension ring 34 is connected to the lower end of the central axis 31; specifically, the suspension ring 34 is connected to the second step shaft 313, and a locking ring 314 is also provided at the lower end of the second step shaft 313 to reliably position the suspension ring 34 on the second step shaft 313 to prevent the suspension ring 34 from axially moving relative to the main shaft 311; the outer diameter of the suspension ring 34 is larger than the inner diameter of the seat ring 15 but smaller than the inner diameter of the drill pipe 10; when the static penetration device is assembled into the drill pipe 10, the static penetration probe 20, the screw nut transmission mechanism 50 and the driving mechanism 40 all pass through the seat ring 15, and the suspension ring 34 of the hanging mechanism 30 is crimped onto the top surface of the seat ring 15, thereby realizing the suspension of the static penetration device at a specific position in the drill pipe 10, and the static penetration device is axially lowered to ensure that the device does not move downward. The ejection mechanism 32 is wound around the central axis 31. The ejection mechanism 32 can be expanded outwardly under the action of external force to engage with the ejection chamber 12 or contracted inwardly to disengage from the ejection chamber 12, so as to realize a detachable connection between the static sounding device and the drill pipe 10; specifically, when the static sounding device is assembled into the drill pipe 10, the ejection mechanism 32 is expanded outwardly under the action of the downward force and is contracted into the groove of the ejection chamber 12, so as to perform an axial upper limit on the static sounding device; when the static sounding device is removed from the drill pipe 10, the ejection mechanism 32 can be contracted inwardly under the action of the lifting force of the armored cable and disengaged from the ejection chamber 12, so that the static sounding device can be smoothly lifted and recovered from the drill pipe 10; thereby, the convenience of disassembly and assembly between the static sounding device and the drill pipe 10 is realized.

[0043] The driving mechanism 40 includes a sealed cabin 41 and a motor 42 installed inside the sealed cabin 41; the motor output shaft 421 is coaxially arranged with the central axis 31. The sealed cabin 41 is connected to the lower part of the central axis 31; the sealed cabin 41 is airtight to protect the motor 42 from being damaged by water pressure and to prevent seawater from entering the cabin and affecting the normal operation of the motor 42. The output shaft of the motor 42 penetrates the sealed cabin 41 and extends downward, and a sealing device is provided at the penetration point between the motor output shaft 421 and the sealed cabin 41.

[0044] The input end of the screw-nut transmission mechanism 50 is connected to the motor output shaft 421; when the motor 42 is started, the motor output shaft 421 rotates to drive the screw-nut transmission mechanism 50 to move. The output end of the screw-nut transmission mechanism 50 is connected to the static penetration probe 20. The screw-nut transmission mechanism 50 is configured to convert the rotational motion of the motor output shaft 421 into the axial linear motion of the static penetration probe 20 when the motor 42 is started, so that the static penetration probe 20 can penetrate into the soil to be tested for static penetration measurement.

[0045] To further explain, the present embodiment adopts the motor 42 as the driving force of the static penetration device, which reduces the complexity of the device compared to the traditional hydraulic drive, makes the structure of the static penetration device more compact, and can improve the static penetration measurement efficiency.

[0046] The above-mentioned schematic embodiment realizes the integrated application of the static penetration device in the space of the slender and narrow drill pipe 10, and realizes the detachable connection between the two, thereby allowing the seabed drilling rig to expand the static penetration function on the basis of the original drilling and sampling function. Therefore, the same seabed drilling rig can be used to perform drilling sampling and static penetration measurement in an alternating cycle, thereby significantly reducing the cost of marine geological exploration.

[0047] refer to Figure 2 , Figure 7 , Fig. 9 As shown, in some embodiments, the screw nut transmission mechanism 50 includes a guide cylinder 51 and a screw 52, ​​a nut 53 and a penetration cylinder 54 located in the guide cylinder 51; the guide cylinder 51, the screw 52, ​​the nut 53 and the penetration cylinder 54 are all coaxially arranged with the central axis 31. The guide cylinder 51 is connected to the lower part of the sealed cabin 41, and an axially extending guide groove 511 is provided on the cylinder wall of the guide cylinder 51. The upper end of the screw 52 is connected to the motor output shaft 421; the nut 53 is screwed on the screw 52, ​​and a guide plate 55 is connected to the nut 53, which is inserted in the guide groove 511 and matched with the groove width of the guide groove 511, so that the nut 53 can move along the guide groove 511 under the action of external force. Two guide grooves 511 on the guide cylinder 51 can be symmetrically provided, and the number of the guide plates 55 is also two accordingly, so that the nut 53 can move more smoothly. The penetration tube 54 is sleeved outside the lead screw 52 but does not contact the lead screw 52 ; the upper end of the penetration tube 54 is connected to the nut 53 , and the lower end is connected to the static penetration probe 20 .

[0048] To further explain, when static penetration measurement is to be performed, the motor 42 is started, and the motor output shaft 421 drives the screw 52 to rotate, thereby driving the nut 53 and the penetration tube 54 to move downward along the length direction of the guide groove 511, thereby driving the static penetration probe 20 at the lower end of the penetration tube 54 to move axially downward to penetrate into the soil to be tested for static penetration measurement; after the static penetration measurement is completed, the motor 42 rotates in the opposite direction, driving the static penetration probe 20 to move axially upward to exit the soil.

[0049] The above exemplary embodiment refines the specific structural arrangement of the screw-nut transmission mechanism 50 , and is capable of converting the rotational motion of the motor output shaft 421 into the axial linear motion of the static penetration probe 20 .

[0050] refer to Figure 7 , Figure 8 As shown, in some embodiments, the static penetration device further includes a bevel gear transmission mechanism 60, which includes a first bevel gear 61 and a second bevel gear 62 arranged opposite to each other, and two third bevel gears 63 arranged opposite to each other and meshingly connected between the first bevel gear 61 and the second bevel gear 62; the first bevel gear 61, the second bevel gear 62 and the third bevel gear 63 are all right-angle bevel gears. A stable cavity 601 is enclosed between the first bevel gear 61, the second bevel gear 62 and the two third bevel gears 63. The axle of the first bevel gear 61 is connected to the motor output shaft 421, and the axle of the second bevel gear 62 is connected to the upper end of the lead screw 52 through a connecting sleeve 57; the two third bevel gears 63 are respectively mounted on two gear seats 64, and the two gear seats 64 are connected to the bottom of the sealed cabin 41. Further explanation, when the motor 42 is started, the motor output shaft 421 drives the first bevel gear 61 to rotate, and after the two third bevel gears 63 are meshed and driven, the second bevel gear 62 is driven to rotate, and then the lead screw 52 is driven to rotate. This exemplary embodiment realizes torque transmission between the drive mechanism 40 and the screw nut transmission mechanism 50 .

[0051] refer to Figure 2 , Figure 5 , Figure 7-Figure 9As shown, in some embodiments, the sealed cabin 41 is provided with an outer cylinder 43, and there is a gap between the outer cylinder 43 and the sealed cabin 41. The upper end of the outer cylinder 43 is connected to the central shaft 31, and the lower end is connected to the guide cylinder 51. The central shaft 31, the second bevel gear 62 and the lead screw 52 are all provided with an inner channel that passes axially. A short sleeve 65 is inserted in the inner channel of the second bevel gear 62, and one end of the short sleeve 65 passes through the cavity 601 in the bevel gear group transmission mechanism 60 and is bent outward to align with the gap between the outer cylinder 43 and the sealed cabin 41; specifically, the sealed cabin 41 is provided with a limiting groove near the short sleeve 65, one end of the short sleeve 65 is inserted into the limiting groove, and the other end of the short sleeve 65 is inserted into the connecting sleeve 57 through the bearing 66, so that the short sleeve 65 will not rotate when the second bevel gear 62 rotates. The cable used in static penetration testing passes through the inner channel of the central shaft 31 , the gap between the outer cylinder 43 and the sealed cabin 41 , the short sleeve 65 , and the inner channel of the lead screw 52 to be connected to the static penetration testing probe 20 .

[0052] The above-mentioned schematic embodiment realizes the passage of cables in a narrow space by constructing a threading channel between the bottom static sounding probe 20 and the top armored cable connector 33, thereby enabling the measurement data obtained by the static sounding probe to be transmitted to the mother ship in real time, breaking through the limitation that traditional self-contained probes cannot transmit measurement data in real time.

[0053] refer to Fig. 9 As shown, in some embodiments, the tail of the static penetration probe 20 is connected with a long sleeve 21, which is inserted into the inner channel of the lead screw 52 but does not contact it. The cable entering the inner channel of the lead screw 52 passes through the long sleeve 21 and is connected to the static penetration probe 20; the cable part located in the long sleeve 21 is a spiral cable 22, which is retractable; therefore, when the static penetration probe 20 moves axially back and forth, the cable length in the long sleeve 21 is adaptive.

[0054] refer to Figure 7 , Fig. 9 As shown, in some embodiments, a plurality of straightening rings 16 are installed on the inner wall of the outer tube 13 of the drill pipe 10 at intervals along the axial direction thereof, and the outer walls of the outer cylinder 43 and the guide cylinder 51 are pressed against the straightening rings 16; thereby, the outer cylinder 43 and the guide cylinder 51 are coaxially arranged with the drill pipe 10, ensuring the assembly stability of the static penetration device in the drill pipe 10. A shaft sleeve 56 is embedded in the lower end of the guide cylinder 51, and the penetration cylinder 54 is inserted into the shaft sleeve 56 and slidably connected thereto; thereby, the stability of the penetration cylinder 54 during reciprocating movement is ensured, thereby ensuring the stability of the static penetration probe 20 during the process of penetrating the soil to be tested.

[0055] refer to Figure 7As shown, in some embodiments, the sealed cabin 41 includes a cabin 411, a hatch 412, a piston 413, and a spring seat 414. The hatch 412 is sealed and connected to the lower end of the cabin 411; further, the motor output shaft 421 penetrates the hatch 412 and extends downward, the axle of the first bevel gear 61 penetrates the hatch 412 and is connected to the motor output shaft 421, and the axle of the first bevel gear 61 is sealed and connected to the hatch 412. The spring seat 414 is connected to the upper end of the cabin 411, and the piston 413 is slidably connected in the cabin 411 between the motor 42 and the spring seat 414. The piston 413 is sleeved with an O-ring to achieve dynamic sealing between it and the cabin 411. The cabin 411 between the piston 413 and the hatch 412 is filled with hydraulic oil to enhance the pressure resistance of the sealed cabin 41 in water.

[0056] Furthermore, a watertight connector is provided on the piston 413 to pass the cable of the motor 42, so that the cable of the motor 42 in the sealed cabin 41 is led out from the sealed cabin 41 and connected to the armored cable connector 33 through the channel in the central shaft 31. The piston 413 is also provided with an oil filling joint and an exhaust joint, through which the hydraulic oil is filled into the cabin 411, and the gas that may exist in the hydraulic oil is discharged through the exhaust joint; accordingly, a through hole is opened on the spring seat 414 at the position corresponding to the watertight connector, the oil filling joint and the exhaust joint.

[0057] A first compression spring 415 is sandwiched between the piston 413 and the spring seat 414. Specifically, a receiving hole is provided on the spring seat 414, and the first compression spring 415 is installed in the receiving hole; the first compression spring 415 is always in a compressed state; the piston 413 maintains balance under the action of the pressure inside the cabin, the pressure outside the cabin and the compressive force of the first compression spring 415, that is, pressure compensation is performed through the setting of the first compression spring 415, so that the pressure inside the sealed cabin 41 is always slightly greater than the pressure outside the cabin. This ensures that the sealed cabin 41 will not be deformed or even crushed and fail, thereby protecting the equipment in the sealed cabin 41. On the other hand, it ensures that seawater will not enter the sealed cabin 41, thereby avoiding corrosion and short circuit of the equipment in the cabin. This enables the static penetration device to more flexibly adapt to the needs of marine geological exploration at different depths.

[0058] In some embodiments, the motor 42 is a coreless motor. Compared with traditional motors, coreless motors have the advantages of high working efficiency, high power density, no cogging effect and torque lag, low starting torque, no radial force, low noise, fast response, high peak torque and good heat dissipation, and are particularly suitable for static penetration measurement needs.

[0059] refer to Figure 3-Figure 6As shown, in some embodiments, a circle of grooves is provided on the inner wall of the ejection chamber 12 of the drill pipe 10 near one end of the ejection stop tube 11, and a plurality of axially extending clamping strips 121 are uniformly protruded in the groove along its circumference to divide the groove into a plurality of clamping slots 122; the protruding height of the clamping strips 121 is flush with the inner wall surface of the ejection chamber 12.

[0060] The snap-in mechanism 32 includes a connecting tube 321, a sliding sleeve 322, and a plurality of snap-in assemblies 323 arranged in sequence from top to bottom. The connecting tube 321 is sleeved on the main shaft 311 of the central shaft 31 and is slidably connected thereto. The armored cable connector 33 is connected to the upper end of the connecting tube 321. A locking nut 35 is provided at the upper end of the main shaft 311. The sliding sleeve 322 is sleeved outside the main shaft 311 of the central shaft 31. The upper end of the sliding sleeve 322 is inserted and fixed in the connecting tube 321. The lower end protrudes outside the connecting tube 321 and is provided with a retaining wall 3221 folded inwardly. The retaining wall 3221 is slidably connected to the main shaft 311 of the central shaft 31. A plurality of axially extending sliding grooves 3222 are evenly provided on the side wall of the sliding sleeve 322 along its circumference.

[0061] A plurality of groups of spring-cage assemblies 323 are evenly arranged around the central axis 31, and each spring-cage assembly 323 includes a spring-cage claw 3231, a spring-cage connecting plate 3232, and a slide seat 3233. The slide seat 3233 includes a seat plate 3234 and a connecting ear 3235 protruding from the seat plate 3234. The seat plate 3234 is sandwiched between the main shaft 311 and the sliding sleeve 322, and the seat plate 3234 is slidably connected to the main shaft 311; one end of the connecting ear 3235 extends outward through the sliding groove 3222 on the sliding sleeve 322, and a second compression spring 324 is sandwiched between the protruding end of the connecting ear 3235 and the connecting tube 321. Specifically, a receiving hole is recessed on the end surface of the connecting tube 321 corresponding to each connecting ear 3235, and the second compression spring 324 is installed in the receiving hole. One end of the spring-cage claw 3231 is a hinged end, which is hinged on the first step shaft 312 of the central axis 31; the other end is an opening and closing end, which is rotatably connected to one end of the spring-cage connecting plate 3232, and the other end of the spring-cage connecting plate 3232 is rotatably connected to the protruding end of the connecting ear 3235.

[0062] When the static penetration device is assembled into the drill pipe 10, the external force, i.e., the downward force, exerts a downward force on the slide 3233, and the slide 3233 moves downward, driving the spring-cage connecting plate 3232 to rotate outward around its connection end with the connecting ear 3235, thereby causing the opening and closing end of the spring-cage claw 3231 to rotate outward around its hinged end, i.e., to be stretched outward so that the spring-cage claw 3231 is engaged in the slot 122, and the end surface of the opening and closing end of the spring-cage claw 3231 presses against the interface between the slot 122 and the spring-cage retaining tube 11, thereby achieving the axial upper limit of the static penetration device. Further explanation: the second compression spring 324 is in a compressed state to exert a spring compression force on the slide 3233, so that the side of the slide 3233 is pressed against the retaining wall 3221 of the sleeve 322, thereby ensuring that the spring-cage claw 3231 is reliably engaged in the slot 122. It should be noted that, although the spring-loaded claw 3231 is engaged in the slot 122 at this time, the side of the spring-loaded claw 3231 may not be able to exactly abut against the side of the retaining strip 121 to achieve a circumferential stop rotation limit. However, when the motor 42 is started and drives the screw 52 to rotate in a very short time, the center shaft 31 will rotate to a certain extent, thereby driving the spring-loaded claw 3231 to rotate so that it abuts against the side of the retaining strip 121, so that a circumferential stop rotation limit is achieved between the spring-loaded claw 3231 and the retaining strip 121, and the center shaft 31 no longer rotates, thereby ensuring that the static sounding device will not rotate during the static sounding process, thereby avoiding affecting the penetration and measurement of the static sounding probe 20 into the soil to be tested. Those skilled in the art will appreciate that the core tube used for drilling and sampling only needs to be limited in the axial direction, but not in the circumferential direction, and therefore the ejection chamber 12 is usually only designed with a groove; therefore, the arrangement of the card slot 122 and the card strip 121 of the ejection chamber 12 in this embodiment takes into account the assembly requirements of the core tube used for drilling and sampling and the static penetration device used for static penetration detection in the drill pipe 10; in addition, the multiple groups of ejection assemblies 323, i.e., the multiple ejection claws 3231 in this embodiment, all move independently and do not affect each other, thereby avoiding the situation where the multiple ejection claws 3231 are difficult to coordinate or restrict each other when they are linked as a whole.

[0063] Combination Fig.10 As shown, when the static penetration device is removed from the drill pipe 10, the external force, i.e., the lifting force of the armored cable, applies an upward force to the connecting tube 321, driving the sliding sleeve 322 and the sliding seat 3233 to move upward, thereby driving the spring-clip connecting plate 3232 to rotate inward around its connecting end with the connecting ear 3235, so that the opening and closing end of the spring-clip claw 3231 rotates inward around its hinged end, i.e., shrinks inward to disengage from the slot 122, thereby releasing the connection between the static penetration device and the drill pipe 10, and the static penetration device can be smoothly lifted out of the drill pipe 10 and recovered.

[0064] The above-mentioned schematic embodiment refines the structural design of the ejection mechanism 32 in the static penetration device and improves the structure of the ejection chamber 12, thereby realizing a detachable connection between the static penetration device and the drill pipe 10, and realizing the axial limitation and circumferential anti-rotation limitation of the static penetration device in the drill pipe 10, thereby ensuring that the static penetration probe 20 can accurately and efficiently penetrate the soil to be tested for measurement.

[0065] refer to Figure 6 As shown, in some embodiments, the number of the clamping strips 121 of the ejection clamping chamber 12 is four; the number of the ejection clamping assemblies 323 is six. This exemplary embodiment ensures that when the static penetration device is lowered into the drill pipe 10, at least one pair of ejection clamping claws 3231 is engaged in the clamping groove 122 by matching the number of the four clamping strips 121 with the number of the six sets of ejection clamping assemblies 323, thereby ensuring that there is always a pair of ejection clamping claws 3231 that can be simultaneously axially and circumferentially limited, avoiding the extreme assembly situation in which all the ejection clamping claws 3231 are stuck on the clamping strips 121 and the ejection clamping assemblies 323, resulting in a failure of limiting.

[0066] To sum up, the static penetration device for use in the drill pipe of a seabed drilling rig of the present invention has a slender and compact structure, can be integrated in the slender and narrow drill pipe space to perform static penetration work, thereby expanding the functions of the seabed drilling rig, so that the seabed drilling rig has a static penetration function on the basis of the original drilling and sampling function, thereby significantly reducing the cost of marine geological exploration; and can transmit static penetration measurement data in real time, thereby significantly improving the efficiency of static penetration measurement.

[0067] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0068] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A static penetration device for use in a drill pipe of a seabed drilling rig, characterized in that: The static penetration device is detachably connected to the drill pipe of the seabed drilling rig; the drill pipe includes a spring-loaded retaining tube, a spring-loaded chamber, an outer tube and a drill bit connected in sequence from top to bottom, and a seat ring is embedded in one end of the outer tube close to the spring-loaded chamber, and the inner diameter of the seat ring is smaller than the inner diameter of the drill pipe; the static penetration device includes a hanging mechanism, a driving mechanism, a screw nut transmission mechanism, a bevel gear group transmission mechanism and a static penetration probe; wherein, The hanging mechanism includes a central axis, a spring-cage mechanism, an armored cable connector and a suspension ring respectively connected to the upper and lower ends of the central axis; the outer diameter of the suspension ring is larger than the inner diameter of the seat ring, and the suspension ring is crimped on the top surface of the seat ring; the spring-cage mechanism is wound around the central axis, and the spring-cage mechanism can be expanded outwards to be engaged with the spring-cage chamber or shrunk inwards to be separated from the spring-cage chamber under the action of external force, so as to realize the detachable connection between the static penetration device and the drill pipe; The driving mechanism includes a sealed cabin and a motor installed inside the sealed cabin, wherein the sealed cabin is connected below the central axis; the output shaft of the motor penetrates the sealed cabin and extends downward; The input end of the screw-nut transmission mechanism is connected to the motor output shaft, and the output end thereof is connected to the static penetration probe; the screw-nut transmission mechanism is configured to convert the rotational motion of the motor output shaft into the axial linear motion of the static penetration probe; the screw-nut transmission mechanism comprises a guide cylinder and a screw, a nut and a penetration cylinder located in the guide cylinder; the guide cylinder is connected to the bottom of the sealing cabin, and an axially extending guide groove is provided on the cylinder wall of the guide cylinder; the upper end of the screw is connected to the motor output shaft; the nut is screwed onto the screw, and a guide plate inserted in the guide groove is connected to the nut; the penetration cylinder is sleeved outside the screw, and the upper end of the penetration cylinder is connected to the nut, and the lower end is connected to the static penetration probe; The bevel gear transmission mechanism comprises a first bevel gear and a second bevel gear arranged opposite to each other, and two third bevel gears arranged opposite to each other and meshingly connected between the first bevel gear and the second bevel gear, wherein a cavity is enclosed between the first bevel gear, the second bevel gear and the two third bevel gears; the axle of the first bevel gear is connected to the output shaft of the motor, and the axle of the second bevel gear is connected to the upper end of the lead screw; An outer cylinder is arranged outside the sealed cabin, and a gap is formed between the outer cylinder and the sealed cabin; the upper end of the outer cylinder is connected to the central axis, and the lower end is connected to the guide cylinder; the central axis, the second bevel gear and the lead screw are all provided with an axially penetrating inner channel; a short sleeve is inserted into the inner channel of the second bevel gear, and one end of the short sleeve passes through the cavity in the transmission mechanism of the bevel gear set and is bent outward to align with the gap between the outer cylinder and the sealed cabin; the cable used for static penetration passes through the inner channel of the central axis, the gap between the outer cylinder and the sealed cabin, the short sleeve, and the inner channel of the lead screw to be connected to the static penetration probe.

2. The static penetration device according to claim 1, characterized in that: The tail of the static penetration probe is connected with a long sleeve, which is inserted into the inner channel of the screw but does not contact it; the cable entering the inner channel of the screw passes through the long sleeve and is connected to the static penetration probe; the cable part located in the long sleeve is a spiral cable.

3. The static penetration device according to claim 1, characterized in that: A plurality of straightening rings are installed on the inner wall of the outer tube at intervals along its axial direction, and the outer walls of the outer cylinder body and the guide cylinder are press-fitted with the straightening rings; a shaft sleeve is embedded in the lower end of the guide cylinder, and the penetration cylinder is inserted into the shaft sleeve and slidably connected with the shaft sleeve.

4. The static penetration device according to claim 1, characterized in that: The sealed cabin includes a cabin cylinder, a cabin cover, a piston, and a spring seat; the cabin cover is sealingly connected to the lower end of the cabin cylinder, the spring seat is connected to the upper end of the cabin cylinder, and the piston is slidably connected in the cabin cylinder between the motor and the spring seat; the cabin cylinder between the piston and the cabin cover is filled with hydraulic oil, and a first compression spring is sandwiched between the piston and the spring seat.

5. The static penetration device according to claim 1, characterized in that: The motor is a coreless motor.

6. The static penetration device according to claim 1, characterized in that: A circle of grooves is provided on the inner wall of the ejection card chamber near one end of the ejection card retaining tube, and a plurality of axially extending clamping strips are uniformly protruded in the groove along the circumference thereof to divide the groove into a plurality of clamping slots; The spring-cage mechanism comprises a connecting tube, a sliding sleeve, and a plurality of spring-cage assemblies arranged in sequence from top to bottom; the connecting tube is sleeved on the upper part of the central axis and is slidably connected thereto, and the armored cable connector is connected to the upper end of the connecting tube; the sliding sleeve is sleeved outside the central axis, the upper end of the sliding sleeve is inserted and fixed in the connecting tube, the lower end protrudes out of the connecting tube and is provided with a retaining wall folded inward, the retaining wall is slidably connected to the central axis, and a plurality of axially extending sliding grooves are uniformly opened on the side wall of the sliding sleeve along its circumference; a plurality of spring-cage assemblies are uniformly arranged around the central axis It is assumed that each of the spring-cage assemblies comprises a spring-cage claw, a spring-cage connecting plate and a sliding seat; the sliding seat comprises a seat plate and a connecting ear protruding from the seat plate, the seat plate is clamped between the central axis and the sliding sleeve, and the seat plate is slidably connected to the central axis, one end of the connecting ear extends outward through a sliding groove on the sliding sleeve, and a second compression spring is clamped between the protruding end of the connecting ear and the connecting tube; one end of the spring-cage claw is hinged on the central axis, and the other end is rotatably connected to one end of the spring-cage connecting plate, and the other end of the spring-cage connecting plate is rotatably connected to the protruding end of the connecting ear; When the static penetration device is assembled into a drill pipe, the elastic claw is pushed outwards by an external force to be engaged in the slot; when the static penetration device is removed from the drill pipe, the elastic claw is shrunk inwards by an external force to be out of the slot.

7. The static penetration device according to claim 6, characterized in that: The number of the card strips in the ejection card chamber is four; the number of the ejection card assemblies is six groups.

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