CN114295655B - Water leakage detector for jacket of offshore platform - Google Patents
Water leakage detector for jacket of offshore platform Download PDFInfo
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- CN114295655B CN114295655B CN202111631518.1A CN202111631518A CN114295655B CN 114295655 B CN114295655 B CN 114295655B CN 202111631518 A CN202111631518 A CN 202111631518A CN 114295655 B CN114295655 B CN 114295655B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract description 13
- 230000007246 mechanism Effects 0.000 claims abstract description 50
- 230000005855 radiation Effects 0.000 claims description 85
- 239000013078 crystal Substances 0.000 claims description 67
- 238000002955 isolation Methods 0.000 claims description 39
- 238000009434 installation Methods 0.000 claims description 38
- 238000007789 sealing Methods 0.000 claims description 17
- 238000001514 detection method Methods 0.000 claims description 15
- 230000001681 protective effect Effects 0.000 claims description 15
- 238000003825 pressing Methods 0.000 claims description 13
- 230000002285 radioactive effect Effects 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 239000011358 absorbing material Substances 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 claims description 2
- 210000001503 joint Anatomy 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000013535 sea water Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The invention discloses a water leakage detector for a jacket of an offshore platform, which comprises an adjusting frame, a ray emitting device and a ray receiving device, wherein the adjusting frame is an open frame with an opening, the ray emitting device and the ray receiving device are respectively arranged on the adjusting frames at two sides of the opening, the ray emitting device and the ray receiving device are arranged opposite to each other, the ray emitting device and the ray receiving device are respectively arranged on the adjusting frame through a sliding positioning mechanism, the sliding positioning mechanism is used for adjusting the ray emitting device and the ray receiving device to be close to or far from the opening, and the adjusting frame is provided with an adjusting device which is used for adjusting the ray emitting device and the ray receiving device to be close to or far from each other. Compared with the prior art, the invention has the beneficial effects that: the device has simple structure, is easy to use, and is convenient to adjust the relative positions of the ray emitting device and the ray receiving device so as to adapt to underwater catheters with different sizes.
Description
Technical Field
The invention belongs to the technical field of offshore platform jacket detection equipment, and particularly relates to a water leakage detector for an offshore platform jacket.
Background
Offshore platforms are the basic facilities for offshore oil and gas resource production, the safety of which is of critical importance, while jacket is the key point for guaranteeing the safety of offshore platforms as a supporting structure for bearing the whole platform. Besides the process irrigation pipe fitting, the jacket balances the weight of part of the platform by virtue of the buoyancy provided by the closed structure of the jacket, and provides powerful guarantee for stably positioning the ocean platform on the sea surface. However, because the conduit is in a severe environment (particularly in a splash zone), the operation working condition is complex, the conduit bears non-single load, and besides the weight of the whole platform, the conduit bears the influences of wind and wave load, earthquake waves and the like, various damages such as fatigue cracks, corrosion and the like can be inevitably generated in the service process of the conduit, so that seawater is permeated into the conduit and even fills the inner cavity of the conduit, the conduit is enabled to lose the function of providing buoyancy, and meanwhile, the conduit corrosion is accelerated by the invaded seawater, so that the structural safety of the conduit is seriously influenced. In addition, most of the platforms are in longer service time and some of the platforms are in longer service time or even out of service, so that the periodic water leakage detection is carried out on the offshore platform supporting guide pipe, problems are found in time, and the method has important significance in guaranteeing the continuous safe production of the platforms.
FMD (flooded member detction) is the most effective and critical device for detecting underwater pipe leaks. Early devices for jacket water penetration detection were generally based on ultrasonic detection methods. Reports (Wu Zhiwei, etc. research and application [ J ] ocean engineering [ 2009,21 (6)) of the detection method of the deep-water jacket structure rod member of the ocean platform indicate that compared with the detection method of the ultrasonic water permeable rod member, the detection method of the ray water permeable rod member has the advantages of high detection efficiency and low cost. However, although the principle of the radiation detection rod member water penetration detection method has been shaped, there is still a lack of mature and easy-to-use FMD devices based on the radiation detection method in the market.
Disclosure of Invention
In view of the above, the invention provides a water leakage detector for a jacket of an offshore platform.
The technical scheme is as follows:
the water leakage detector for the jacket of the offshore platform is characterized by comprising an adjusting frame, a ray transmitting device and a ray receiving device;
the adjusting frame is an open frame with an opening, the ray emitting device and the ray receiving device are respectively arranged on the adjusting frames at two sides of the opening, and the ray emitting device and the ray receiving device are arranged opposite to each other;
the ray emitting device and the ray receiving device are respectively arranged on the adjusting frame through a sliding positioning mechanism, and the sliding positioning mechanism is used for adjusting the ray emitting device and the ray receiving device to be close to or far away from the opening;
the adjusting frame is provided with an adjusting device for adjusting the radiation emitting device and the radiation receiving device to be close to or far away from each other.
As a preferable technical scheme, the adjusting frame comprises a main body bracket and two supporting arms, wherein the two supporting arms are arranged in parallel and opposite to each other, the same ends of the two supporting arms are connected with the main body bracket, and the other ends of the two supporting arms extend out to the same side of the main body bracket, so that the adjusting frame with one side opening is formed with the main body bracket;
the main body support is provided with the adjusting device which is connected with the two supporting arms;
one of the support arms is provided with the ray emitting device through one sliding positioning mechanism, and the other support arm is provided with the ray receiving device through the other sliding positioning mechanism.
As a preferable technical scheme, the sliding positioning mechanism comprises a module mounting seat, wherein the module mounting seat is slidably arranged on the corresponding supporting arm, and a locking mechanism is arranged between the module mounting seat and the supporting arm;
and a position calibration assembly is arranged between the two module installation seats and is used for assisting in realizing the opposite alignment between the two module installation seats.
As a preferable technical scheme, the cross section of the supporting arm is a non-revolving body, the supporting arm is sleeved with the module mounting seat in a sliding manner, an inner hole of the module mounting seat is matched with the cross section of the supporting arm in shape, a locking bolt is arranged on the module mounting seat in a penetrating manner, the locking bolt is matched with the module mounting seat in a threaded manner to form the locking mechanism, and a stud end of the locking bolt abuts against the corresponding supporting arm to lock the module mounting seat;
the module mounting seat is fixedly provided with the ray emitting device or the ray receiving device.
As a preferable technical scheme, the adjusting device comprises a sliding mechanism and a telescopic mechanism;
one sliding mechanism is arranged between each supporting arm and the main body bracket, and the two sliding mechanisms guide the two supporting arms to slide along the connecting line direction of the connecting ends of the two supporting arms;
the telescopic mechanism is connected between the sliding parts of the two sliding mechanisms.
As a preferable technical scheme, the sliding mechanism comprises a chute and a sliding block matched with the chute;
the sliding chute is formed in the main body support, the sliding chute extends along the connecting line direction of the connecting ends of the two supporting arms, two sliding blocks are arranged in the sliding chute, and each sliding block is fixedly connected with the corresponding connecting end of the supporting arm respectively.
As a preferable technical scheme, the telescopic mechanism is a gear-rack mechanism and comprises two racks and a gear;
the gear is arranged in the middle of the chute and is rotatably arranged on the main body bracket;
the gear is positioned between the two racks and meshed with the two racks at the same time;
the two racks are arranged along the length direction of the sliding groove and are respectively close to the two ends of the sliding groove, the two racks are respectively in one-to-one correspondence with the two sliding blocks, and one end of each rack away from the gear is fixedly connected with the corresponding sliding block.
As the preferable technical scheme, the wheel axle of the gear is arranged on the bottom of the chute through a bearing, the wheel axle extends out of the bottom of the chute, and an operation interface is formed at the extending end of the wheel axle.
As a preferred technical scheme, the radiation emitting device comprises a source installation shell with an opening, wherein an active installation flange is arranged on the opening of the source installation shell, a radiation emitting window is arranged on the source installation flange, and a central hole of the source installation flange is sealed by the radiation emitting window, so that the source installation shell, the source installation flange and the radiation emitting window form a sealing system;
a radioactive source assembly is arranged in the source installation shell, the radioactive source assembly is coated with a source isolation sleeve made of a radiation absorbing material, and the source isolation sleeve positions the radioactive source assembly in the source installation shell;
and a center hole opposite to the source mounting flange is formed in the source isolation sleeve, and the center hole is communicated with the center hole sharing hole core line.
As a preferred technical scheme, the radiation receiving device comprises a receiving unit shell, wherein a receiving hole and a crystal placing hole are formed in the receiving unit shell;
the receiving hole is sealed by the ray window of the receiving unit, and the crystal placing hole is covered by the flange cover of the receiving unit, so that a closed cavity is formed in the shell of the receiving unit;
and a crystal positioning assembly are arranged in the closed cavity, the crystal positioning assembly is used for positioning the crystal in the receiving unit shell, and the crystal is opposite to the receiving unit ray window.
Compared with the prior art, the invention has the beneficial effects that: the device has simple structure, is easy to use, and is convenient to adjust the relative positions of the ray emitting device and the ray receiving device so as to adapt to underwater catheters with different sizes.
Drawings
FIG. 1 is a schematic view of a first view of the present invention;
FIG. 2 is a schematic view of a second view of the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
FIG. 4 is an enlarged view of section m of FIG. 3;
FIG. 5 is a schematic diagram of a radiation emitting device;
FIG. 6 is a schematic diagram of an internal structure of the radiation emitting device;
FIG. 7 is a schematic diagram of a ray receiving device;
FIG. 8 is a schematic diagram of an internal structure of a radiation receiving apparatus;
fig. 9 is a schematic diagram of a detector catheter.
Detailed Description
The invention is further described below with reference to examples and figures.
The utility model provides an offshore platform jacket leak detector, includes adjusting frame 100, ray emitter 200 and ray receiver 300. The adjusting frame 100 is an open frame with an opening, the radiation emitting device 200 and the radiation receiving device 300 are respectively arranged on the adjusting frame 100 at two sides of the opening, and the radiation emitting device 200 and the radiation receiving device 300 are opposite to each other. The opening of the adjusting frame 100 allows the detector to surround the catheter, so that the radiation emitting device 200 and the radiation receiving device 300 are disposed on both sides of the catheter, respectively.
The radiation emitting device 200 and the radiation receiving device 300 are respectively arranged on the adjusting frame 100 through a sliding positioning mechanism, and the sliding positioning mechanism is used for adjusting the radiation emitting device 200 and the radiation receiving device 300 to be close to or far away from the opening, so that the detector can adapt to catheters with different pipe diameters or positions. The adjusting frame 100 is provided with an adjusting device for adjusting the approaching or separating of the radiation emitting device 200 and the radiation receiving device 300 to accommodate catheters of different sizes.
As shown in fig. 1 and 2, the adjusting frame 100 includes a main body bracket 110 and two supporting arms 120, the two supporting arms 120 are disposed in parallel and opposite to each other, the same ends of the two supporting arms 120 are connected to the main body bracket 110, and the other ends of the two supporting arms 120 extend toward the same side of the main body bracket 110, so as to form the adjusting frame 100 with one side opened with the main body bracket 110. The main body bracket 110 is provided with the adjusting means connected to the two support arms 120. The radiation emitting device 200 is disposed on one of the support arms 120 through one of the slide positioning mechanisms, and the radiation receiving device 300 is disposed on the other of the support arms 120 through the other of the slide positioning mechanisms.
As shown in fig. 1 and 3, the adjustment device includes a sliding mechanism and a telescoping mechanism 130. One sliding mechanism is disposed between each supporting arm 120 and the main body bracket 110, and two sliding mechanisms guide the two supporting arms 120 to slide along the connecting direction of the connecting ends of the two supporting arms. The telescopic mechanism 130 is connected between the sliding portions of the two sliding mechanisms.
Specifically, the sliding mechanism includes a chute 111 and a slider 112 that is adapted to the chute 111. The main body support 110 is provided with the sliding groove 111, the sliding groove 111 extends along the connecting line direction of the connecting ends of the two supporting arms 120, two sliding blocks 112 are arranged in the sliding groove 111, and each sliding block 112 is fixedly connected with the corresponding connecting end of the supporting arm 120.
In one embodiment, the main body support 110 includes a C-shaped steel, the inner cavity of the C-shaped steel is in a shape of a necking groove, the inner cavity of the C-shaped steel forms the sliding groove 111, and two ends of the C-shaped steel are respectively provided with end limiting blocks 113. The sliding block 112 is arranged in the sliding groove 111, a supporting arm connecting rod 114 is fixedly arranged on the sliding block 112, one end of the supporting arm connecting rod 114 is fixedly connected with the sliding block 112, the other end of the supporting arm connecting rod 114 extends outwards from a notch of the sliding groove 111, and a connecting end of the supporting arm 120 is sleeved on the supporting arm connecting rod 114 and is connected with the supporting arm connecting rod 114 through a bolt. Since the outer wall of the sliding block 112 is fit with the corresponding groove wall and groove bottom of the sliding groove 111, and the notch of the C-shaped steel is a shrinkage, the sliding block 112 can be stabilized in the sliding groove 111 and can bear the gravity of the supporting arm 120 and the radiation emitting device 200 or the radiation receiving device 300.
In this embodiment, the telescopic mechanism 130 is a rack and pinion mechanism, including two racks 131 and one gear 132. The gear 132 is disposed at the middle of the chute 111 and rotatably installed on the body bracket 110. The gear 132 is located between the two racks 131 and simultaneously meshes with the two racks 131. The two racks 131 are all arranged along the length direction of the chute 111 and are respectively close to two ends of the chute 111, the two racks 131 are respectively in one-to-one correspondence with the two sliding blocks 112, and one end, away from the gear 132, of each rack 131 is fixedly connected with the corresponding sliding block 112.
The two racks 131 are respectively clamped between the gear 132 and a groove wall on one side of the chute 111, tooth surfaces of the racks 131 face the gear 132 and are meshed with the gear 132, and surfaces of the racks 131 facing away from the tooth surfaces are respectively in sliding contact with corresponding groove walls of the chute 111. In this way, the rack 131 is stably limited, so that it maintains a stable sliding state.
The gear 132 is mounted as follows: as shown in fig. 4, the axle 133 is disposed through the central bore of the gear 132 and is connected by a key 136. The axle 133 is provided with a bearing 135 and a limit clamp spring 137, which are respectively positioned outside the two end surfaces of the gear 132. Wherein the outer ring of the bearing 135 is fixed on the bottom of the C-shaped steel, and the limit clamp spring 137 is close to the notch of the chute 111. The axle 133 extends out of the bottom of the C-shaped steel, and an operation interface 134 is formed at the extending end of the axle 133. In this embodiment, the operation interface 134 is a section of a quadrangular prism coaxial with the axle 133. The operator interface 134 allows the ROV robot or diver to rotate the gear 132 to adjust the two support arms 120 toward and away from each other.
An operation handle 115 is further arranged in the middle of the main body support 110, and the operation handle 115 is located on the outer side of the bottom of the C-shaped steel groove, so that an ROV robot or a diver can conveniently hold the operation detector.
The sliding positioning mechanism comprises a module mounting seat 121, the module mounting seat 121 is slidably arranged on the corresponding supporting arm 120, and a locking mechanism is arranged between the module mounting seat 121 and the supporting arm 120.
The cross section of the supporting arm 120 is a non-revolving body, the module mounting seat 121 is sleeved on the supporting arm 120 in a sliding manner, and the inner hole of the module mounting seat 121 is matched with the cross section of the supporting arm 120 in shape. In this embodiment, as can be seen in fig. 1 and 5 to 8, the supporting arm 120 is a square tube, and the module mounting seat 121 is a square tube, so that the module mounting seat 121 cannot rotate relatively after being sleeved on the supporting arm 120.
The module mounting seat 121 is provided with a locking bolt 122 in a penetrating manner, the locking bolt 122 is in threaded fit with the module mounting seat 121 to form the locking mechanism, and a stud end of the locking bolt 122 abuts against the corresponding supporting arm 120 to lock the module mounting seat 121. The module mounting base 121 is fixedly provided with the radiation emitting device 200 or the radiation receiving device 300. When the position of the radiation emitting device 200 or the radiation receiving device 300 needs to be adjusted along the length direction of the support arm 120, the locking bolt 122 is loosened and the module mounting seat 121 is slid.
In addition, a position calibration assembly is disposed between the two module mounts 121, and the position calibration assembly is used for assisting in realizing the opposite between the two module mounts 121. The position calibration assembly may be composed of a laser 123 and a laser detector 124, respectively mounted on two of said module mounts 121, and located on the face of the respective module mount 121 facing the inner bore of the adjustment frame. The laser light emitted by the laser 123 is detected by the laser detector 124, indicating that the radiation emitting device 200 and the radiation receiving device 300 are aligned.
As shown in fig. 5 and 6, the radiation emitting device 200 includes a source mounting housing 210 having an opening, an active mounting flange 220 is disposed on the opening of the source mounting housing 210, a radiation emitting window 250 for passing gamma rays is disposed on the source mounting flange 220, and the radiation emitting window 250 closes a central hole of the source mounting flange 220, so that the source mounting housing 210, the source mounting flange 220, and the radiation emitting window 250 form a sealing system.
The source mounting housing 210 has a radiation source assembly disposed therein that is overcladded with a source isolation sleeve made of a radiation absorbing material that positions the radiation source assembly within the source mounting housing 210. A central hole of the source isolation sleeve, which is opposite to the source mounting flange 220, is provided with a collimation hole 241, and the collimation hole 241 is communicated with the central hole in a sharing way. The source isolation kit may be made of lead.
To facilitate storage and transportation of the radiation emitting device 200, the source mounting flange 220 is detachably fastened with a protective cover 290 made of a radiation absorbing material, and the protective cover 290 shields the source mounting flange 220 and the radiation emitting window 250. The protective cover 290 is fastened to the outside of the source mounting flange 220 and covers the interface between the source mounting flange 220 and the source mounting housing 210.
The protective cover 290 is thickened at the center to form a protective circular truncated cone 291, and the diameter of the protective circular truncated cone 291 is not smaller than the diameter of the collimating aperture 241, preferably equal to or larger than the diameter of the radiation emission window 250. The thickness of the protection round platform 291 is larger, so that the absorption of gamma rays at the ray emission window 250 can be enhanced, and the safety is improved. The protective cover 290 may also be made of lead.
The mounting structure of the radiation emission window 250 is: the middle part of the outer side surface of the source mounting flange 220 is provided with a ray window hole which is communicated with the central hole of the source mounting flange 220, a circular ray emission window 250 and a ray window pressing ring 221 are arranged in the ray window hole, the ray emission window 250 and the ray window pressing ring 221 are arranged in a concentric line, the inner edge of the ray window pressing ring 221 presses the edge of the ray emission window 250, and the inner side surface of the ray window pressing ring 221 abuts against the hole bottom of the ray window hole and is connected through bolts so as to tightly press the ray emission window 250 on the hole bottom of the ray window hole, so that the central hole of the source mounting flange 220 is sealed and shielded. The outer side of the radiation emission window 250 and the outer side of the radiation window pressing ring 221 are both flat with the outer side of the source mounting flange 220.
To further enhance the sealing, the outer surface edge of the radiation emission window 250 is matched with the inner surface edge of the radiation window pressing ring 221 in a step manner. The aperture bottom middle portion of the radiation aperture is protruded outwards to form a sealing convex ring 222 surrounding the central hole of the source mounting flange 220, the inner surface middle portion of the radiation emission window 250 is thinned corresponding to the sealing convex ring 222 to form a counter bore, the aperture bottom of the counter bore is abutted against the sealing convex ring 222, and the aperture wall of the counter bore is abutted against the annular outer wall of the sealing convex ring 222.
In this embodiment, the source mounting housing 210 is a hollow cylinder with an opening at one end, the opening of the source mounting housing 210 is provided with the source mounting flange 220, a portion of the source mounting flange 220 facing the inner cavity of the source mounting housing 210 protrudes inwards to form a boss 223, and an annular side wall of the boss 223 abuts against the inner side surface of the opening of the source mounting housing 210. The source mounting flange 220 is bolted to the source mounting housing 210 and the boss 223 abuts the source isolation sleeve.
The source isolation sleeve comprises a hollow cylindrical source isolation sleeve 230, an inner cavity of the source isolation sleeve 230 is opened on one end face, an annular source isolation pad 240 is covered on the end face in a buckling mode, the outer diameter of the source isolation pad 240 is equal to the outer diameter of the source isolation sleeve 230, and the outer cylindrical surfaces of the source isolation pad 240 and the source isolation sleeve 230 are attached to the inner wall cylindrical surface of the source installation shell 210. The radiation source assembly is disposed in the inner cavity of the source isolation sleeve 230 and is adapted to the shape thereof, and the inner diameter of the source isolation pad 240 is smaller than the inner diameter of the source isolation sleeve 230 so as to define the radiation source assembly in the source isolation sleeve 230.
The inner bore of the source spacer 230 forms the collimation hole 241.
The radiation source assembly comprises a source installation cabin 260, the outer wall of the source installation cabin 260 is matched with the shape of the inner cavity of the source isolation sleeve 230, a radiation source 280 is arranged in the source installation cabin 260, a radial outlet 261 axially communicated with the collimation hole 241 is arranged on the bulkhead of the source installation cabin 260 corresponding to the collimation hole 241, an imbedding hole for the radiation source 280 to enter the source installation cabin 260 is arranged on the bulkhead of the source installation cabin 260 facing away from the collimation hole 241, a source set screw 270 is arranged in the imbedding hole and is in threaded fit with the imbedding hole, and a source pad 271 is arranged between the stud end of the source set screw 270 and the radiation source 280.
The outer wall of the source mounting housing 210 is fixedly connected, such as welded, to the corresponding module mount 121. The whole ray emitting device 200 has compact structure and good sealing performance, and is convenient for underwater use.
As shown in fig. 7 and 8, the radiation receiving apparatus 300 includes a receiving unit housing 310, and a receiving hole 311 and a crystal insertion hole are formed in the receiving unit housing 310. The receiving hole 311 is sealed by the receiving unit radiation window 330, and the crystal insertion hole is covered with the receiving unit flange cover 320, so that a closed cavity is formed in the receiving unit housing 310. A crystal 360 and a crystal positioning assembly are disposed within the enclosed cavity, the crystal positioning assembly positioning the crystal 360 within the receiving unit housing 310, the crystal 360 facing the receiving unit window 330.
In this embodiment, the receiving unit housing 310 is cylindrical, an inner wall of one end of the receiving unit housing 310 is radially contracted to form a stop ring 312, an inner hole of the stop ring 312 forms the receiving hole 311, and an opening of the other end of the receiving unit housing 310 forms the crystal insertion hole. The receiving unit housing 310 is sequentially provided with a receiving unit radiation window 330, a compression ring 340 and a crystal 360 from the receiving hole 311 to the crystal placement hole, and a crystal positioning assembly is further provided outside the crystal 360.
The aperture of the receiving aperture 311 is larger than the aperture of the collimating aperture 241 in view of the divergence of the radiation beam during propagation.
The receiving unit flange cover 320 is connected with the receiving unit housing 310 through bolts, and the inner side surface of the receiving unit flange cover 320 presses the crystal 360, so that the pressure ring 340 presses the edge of the receiving unit radiation window 330 against the limiting ring 312.
The outer diameter of the receiving unit radiation window 330 is the same as the inner diameter of the receiving unit housing 310, and the outer side surface of the receiving unit radiation window 330 is matched with the step of the limiting ring 312, so as to improve the assembly tightness. An annular step is formed at the edge of the inner side surface of the receiving unit radiation window 330, the annular step is matched with the pressing ring 340, and the crystal positioning assembly and the crystal 360 are arranged between the pressing ring 340 and the receiving unit flange cover 320.
The crystal 360 is cylindrical, one end of the crystal faces the receiving unit radiation window 330, and the other end of the crystal abuts against the inner side surface of the receiving unit flange cover 320. The crystal positioning assembly includes an elastic crystal fixing sleeve 350 and an end positioning ring 321. The crystal fixing sleeve 350 is sleeved at the end part of the crystal 360, which faces the receiving unit ray window 330, the crystal fixing sleeve 350 is clamped between the inner wall of the receiving unit housing 310 and the circumferential surface of the outer wall of the crystal 360, one end of the crystal fixing sleeve 350, which faces the pressure ring 340, is integrally formed with an elastic ring pad 351, and the elastic ring pad 351 is clamped between the pressure ring 340 and the end surface of the crystal 360, which faces the receiving unit ray window 330. Since the crystal fixing sleeve 350 and the elastic ring pad 351 have elasticity, the crystal 360 is protected.
The end positioning ring 321 is sleeved on the end of the crystal 360, which is close to the receiving unit flange cover 320, and the outer wall of the end positioning ring 321 is attached to the inner wall of the receiving unit housing 310.
The end positioning ring 321 and the crystal fixing sleeve 350 fix their radial positions from both ends of the crystal 360, respectively.
The end positioning ring 321 is integrally formed on the inner side surface of the receiving unit flange cover 320, a circumferential surface of the outer wall of the end positioning ring 321 is provided with a ring groove, a sealing ring 322 is disposed in the ring groove, and the sealing ring 322 seals a contact surface between the end positioning ring 321 and the receiving unit housing 310.
During detection, the protective cover 290 is removed, and the rov robot or the diver faces the opening of the detector adjusting frame 100 to the detected catheter, and pushes the radiation emitting device 200 and the radiation receiving device 300 to be respectively positioned at two sides of the central line of the catheter, and then detection is performed, as shown in fig. 9. The radiation emitting device 200 and the radiation receiving device 300 are adjusted to appropriate positions as needed. The gamma ray beam emitted from the radiation emitting device 200 passes through the catheter under test and is received by the radiation receiving device 300. The detector is adopted for testing under the experimental condition of simulating the underwater environment of the catheter in advance, so that the relation between the received ray beam intensity and the emitted ray beam intensity is obtained, and an internal parameter standard is formed. In the underwater detection, whether water enters the catheter is deduced according to the attenuation of the received ray beam intensity relative to the emitted ray beam intensity, and compared with an internal parameter standard by combining known substance related characteristic parameters between the ray emitting device 200 and the ray receiving device 300.
Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and that many similar changes can be made by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. The utility model provides an offshore platform jacket leak detection appearance which characterized in that: comprises an adjusting frame (100), a ray emitting device (200) and a ray receiving device (300);
the adjusting frame (100) is an open frame with an opening, the ray emitting device (200) and the ray receiving device (300) are respectively arranged on the adjusting frame (100) at two sides of the opening, and the ray emitting device (200) and the ray receiving device (300) are arranged opposite to each other;
the ray emitting device (200) and the ray receiving device (300) are respectively arranged on the adjusting frame (100) through a sliding positioning mechanism, and the sliding positioning mechanism is used for adjusting the ray emitting device (200) and the ray receiving device (300) to be close to or far from the opening;
the adjusting frame (100) is provided with an adjusting device for adjusting the radiation emitting device (200) and the radiation receiving device (300) to be close to or far from each other;
the radiation emitting device (200) comprises a source mounting shell (210) with an opening, wherein an active mounting flange (220) is arranged on the opening of the source mounting shell (210), a radiation emitting window (250) is arranged on the source mounting flange (220), and the radiation emitting window (250) seals a central hole of the source mounting flange (220), so that the source mounting shell (210), the source mounting flange (220) and the radiation emitting window (250) form a sealing system;
a radioactive source assembly is arranged in the source mounting shell (210), and is coated with a source isolation sleeve made of a radiation absorbing material, and the source isolation sleeve positions the radioactive source assembly in the source mounting shell (210);
a center hole opposite to the source mounting flange (220) is formed in the source isolation sleeve, and a collimation hole (241) is formed in the center hole, and the collimation hole (241) and the center hole share a hole core line and are communicated;
the ray receiving device (300) comprises a receiving unit shell (310), wherein a receiving hole (311) and a crystal placement hole are formed in the receiving unit shell (310);
the receiving hole (311) is sealed by a receiving unit ray window (330), and the crystal placement hole is covered with a receiving unit flange cover (320), so that a closed cavity is formed in the receiving unit shell (310);
a crystal (360) and a crystal positioning assembly are arranged in the closed cavity, the crystal positioning assembly is used for positioning the crystal (360) in the receiving unit shell (310), and the crystal (360) is opposite to the receiving unit ray window (330);
the source isolation kit is made of lead;
a protective cover (290) made of a radiation absorbing material is detachably buckled outside the source mounting flange (220), and the protective cover (290) shields the source mounting flange (220) and the radiation emission window (250); the protective cover (290) is buckled outside the source mounting flange (220) and covers the butt joint surface of the source mounting flange (220) and the source mounting shell (210);
the center of the protective cover (290) is thickened to form a protective round table (291), the diameter of the protective round table (291) is not smaller than the aperture of the collimation hole (241), and the protective cover (290) is made of lead;
a ray window hole is formed in the middle of the outer side surface of the source mounting flange (220), the ray window hole is communicated with a central hole of the source mounting flange (220), a circular ray emission window (250) and a ray window pressing ring (221) are arranged in the ray window hole, the ray emission window (250) and the ray window pressing ring (221) are arranged in a concentric line, the inner edge of the ray window pressing ring (221) presses the edge of the ray emission window (250), the inner side surface of the ray window pressing ring (221) abuts against the hole bottom of the ray window hole and is connected through bolts, so that the ray emission window (250) is pressed on the hole bottom of the ray window hole, the central hole of the source mounting flange (220) is sealed and shielded, and the outer side surface of the ray emission window (250) and the outer side surface of the ray window pressing ring (221) are all parallel to the outer side surface of the source mounting flange (220).
The outer surface edge of the ray emission window (250) is matched with the inner surface edge of the ray window compression ring (221) in a step mode; the middle of the hole bottom of the ray window hole is outwards protruded to form a sealing convex ring (222) surrounding the central hole of the source mounting flange (220), the middle of the inner surface of the ray emission window (250) is thinned corresponding to the sealing convex ring (222) to form a counter bore, the hole bottom of the counter bore is abutted against the sealing convex ring (222), and the hole wall of the counter bore is abutted against the annular outer wall of the sealing convex ring (222);
the source installation shell (210) is hollow cylindrical with one end open, the opening of the source installation shell (210) is provided with the source installation flange (220), the part of the source installation flange (220) facing the inner cavity of the source installation shell (210) protrudes inwards to form a boss (223), and the annular side wall of the boss (223) is abutted against the inner side surface of the opening of the source installation shell (210); the source mounting flange (220) is bolted to the source mounting housing (210), the boss (223) abutting the source isolation sleeve;
the source isolation sleeve comprises a hollow cylindrical source isolation sleeve (230), an inner cavity of the source isolation sleeve (230) is opened on one end face, an annular source isolation pad (240) is buckled on the end face of the inner cavity opening of the source isolation sleeve (230), the outer diameter of the source isolation pad (240) is equal to the outer diameter of the source isolation sleeve (230), and the outer cylindrical surfaces of the source isolation pad (240) and the source isolation sleeve (230) are attached to the inner wall cylindrical surface of the source installation shell (210); the radioactive source assembly which is matched with the shape of the radioactive source assembly is arranged in the inner cavity of the source isolation sleeve (230), and the inner diameter of the source isolation pad (240) is smaller than the inner diameter of the source isolation sleeve (230) so as to limit the radioactive source assembly in the source isolation sleeve (230);
-the inner bore of the source spacer sleeve (230) forms the collimation hole (241);
the radioactive source assembly comprises a source installation cabin (260), the outer wall of the source installation cabin (260) is matched with the inner cavity of the source isolation sleeve (230), a radioactive source (280) is arranged in the source installation cabin (260), a radial outlet hole (261) which is axially communicated with the collimation hole (241) is formed in a bulkhead of the source installation cabin (260) corresponding to the collimation hole (241), an embedding hole for the radioactive source (280) to enter the source installation cabin (260) is formed in a bulkhead of the source installation cabin (260) facing away from the collimation hole (241), a source set screw (270) is arranged in the embedding hole, the source set screw (270) is in threaded fit with the embedding hole, and a source pad (271) is arranged between a stud end of the source set screw (270) and the radioactive source (280);
the outer wall of the source mounting shell (210) is fixedly connected with the corresponding module mounting seat (121);
the receiving unit shell (310) is cylindrical, one end inner wall of the receiving unit shell (310) radially contracts to form a limiting ring (312), an inner hole of the limiting ring (312) forms the receiving hole (311), and the other end opening of the receiving unit shell (310) forms the crystal placing hole; a receiving unit ray window (330), a compression ring (340) and a crystal (360) are sequentially arranged in the receiving unit shell (310) from the receiving hole (311) to the crystal placement hole, and a crystal positioning assembly is further arranged outside the crystal (360);
the aperture of the receiving hole (311) is larger than the aperture of the collimating aperture (241);
the receiving unit flange cover (320) is connected with the receiving unit shell (310) through bolts, and the inner side surface of the receiving unit flange cover (320) is pressed against the crystal (360) so that the compression ring (340) compresses the edge of the receiving unit ray window (330) on the limiting ring (312);
the outer diameter of the receiving unit ray window (330) is the same as the inner diameter of the receiving unit shell (310), the outer side surface of the receiving unit ray window (330) is matched with the step of the limiting ring (312), an annular step is formed at the edge of the inner side surface of the receiving unit ray window (330), the annular step is matched with the compression ring (340), and the crystal positioning assembly and the crystal (360) are arranged between the compression ring (340) and the receiving unit flange cover (320);
the crystal (360) is cylindrical, one end of the crystal faces the receiving unit ray window (330), and the other end of the crystal abuts against the inner side surface of the receiving unit flange cover (320); the crystal positioning assembly includes an elastic crystal fixing sleeve (350) and an end positioning ring (321); the crystal fixing sleeve (350) is sleeved at the end part of the crystal (360) facing the receiving unit ray window (330), the crystal fixing sleeve (350) is clamped between the inner wall of the receiving unit shell (310) and the outer wall circumferential surface of the crystal (360), one end of the crystal fixing sleeve (350) facing the compression ring (340) is integrally formed with an elastic ring pad (351), and the elastic ring pad (351) is clamped between the compression ring (340) and the end surface of the crystal (360) facing the receiving unit ray window (330);
the end positioning ring (321) is sleeved on the end part of the crystal (360) close to the receiving unit flange cover (320), and the outer wall of the end positioning ring (321) is attached to the inner wall of the receiving unit shell (310);
the end positioning ring (321) and the crystal fixing sleeve (350) fix the radial positions of the crystal (360) from two ends of the crystal;
the end positioning ring (321) is integrally formed on the inner side surface of the receiving unit flange cover (320), an annular groove is formed in the circumferential surface of the outer wall of the end positioning ring (321), a sealing ring (322) is arranged in the annular groove, and the sealing ring (322) seals the contact surface between the end positioning ring (321) and the receiving unit shell (310).
2. The offshore platform jacket leak detector of claim 1, wherein: the adjusting frame (100) comprises a main body support (110) and two supporting arms (120), wherein the two supporting arms (120) are arranged in parallel and opposite to each other, the same ends of the two supporting arms (120) are connected with the main body support (110), and the other ends of the two supporting arms (120) extend out to the same side of the main body support (110), so that the adjusting frame (100) with one side opened is formed by the two supporting arms and the main body support (110);
the main body bracket (110) is provided with the adjusting device which is connected with the two supporting arms (120);
one of the support arms (120) is provided with the radiation emitting device (200) through one of the sliding positioning mechanisms, and the other support arm (120) is provided with the radiation receiving device (300) through the other sliding positioning mechanism.
3. The offshore platform jacket leak detector of claim 2, wherein: the sliding positioning mechanism comprises a module mounting seat (121), the module mounting seat (121) is slidably arranged on the corresponding supporting arm (120), and a locking mechanism is arranged between the module mounting seat (121) and the supporting arm (120);
a position calibration assembly is arranged between the two module installation seats (121), and the position calibration assembly is used for assisting in realizing the opposite direction between the two module installation seats (121).
4. The offshore platform jacket leak detector of claim 3, wherein: the cross section of the supporting arm (120) is a non-revolving body, the module installation seat (121) is sleeved on the supporting arm (120) in a sliding manner, an inner hole of the module installation seat (121) is matched with the cross section of the supporting arm (120), a locking bolt (122) is arranged on the module installation seat (121) in a penetrating manner, the locking bolt (122) is in threaded fit with the module installation seat (121) to form the locking mechanism, and a stud end of the locking bolt (122) abuts against the corresponding supporting arm (120) to lock the module installation seat (121);
the module mounting seat (121) is fixedly provided with the ray emitting device (200) or the ray receiving device (300).
5. The offshore platform jacket leak detector of claim 2, wherein: the adjusting device comprises a sliding mechanism and a telescopic mechanism (130);
one sliding mechanism is arranged between each supporting arm (120) and the main body bracket (110), and the two sliding mechanisms guide the two supporting arms (120) to slide along the connecting line direction of the connecting ends of the two supporting arms;
the telescopic mechanism (130) is connected between the sliding parts of the two sliding mechanisms.
6. The offshore platform jacket leak detector of claim 5, wherein: the sliding mechanism comprises a sliding groove (111) and a sliding block (112) matched with the sliding groove (111);
the sliding chute (111) is formed in the main body support (110), the sliding chute (111) extends along the connecting line direction of the connecting ends of the two supporting arms (120), two sliding blocks (112) are arranged in the sliding chute (111), and each sliding block (112) is fixedly connected with the connecting end of the corresponding supporting arm (120) respectively.
7. The offshore platform jacket leak detector of claim 6, wherein: the telescopic mechanism (130) is a gear-rack mechanism and comprises two racks (131) and a gear (132);
the gear (132) is arranged in the middle of the chute (111) and is rotatably arranged on the main body bracket (110);
the gear (132) is positioned between the two racks (131) and meshed with the two racks (131) at the same time;
the two racks (131) are arranged along the length direction of the sliding groove (111) and are respectively close to two ends of the sliding groove (111), the two racks (131) are respectively in one-to-one correspondence with the two sliding blocks (112), and one end, away from the gear (132), of each rack (131) is fixedly connected with the corresponding sliding block (112).
8. The offshore platform jacket leak detector of claim 7, wherein: the wheel axle (133) of the gear (132) is arranged on the bottom of the chute (111) through a bearing (135), the wheel axle (133) extends out of the bottom of the chute (111), and an operation interface (134) is formed at the extending end of the wheel axle (133).
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| CN202111631518.1A CN114295655B (en) | 2021-12-29 | 2021-12-29 | Water leakage detector for jacket of offshore platform |
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