阅读说明：本技术 一种缓冲防撞可伸缩腿式水下采油树防拖网框架 (Buffer anti-collision telescopic leg type anti-trawling net frame for underwater Christmas tree ) 是由 黄熠 刘书杰 王尔钧 孟文波 张崇 刘和兴 管申 董钊 余意 任冠龙 王莹莹 于 2020-12-30 设计创作，主要内容包括：本发明公开了一种缓冲防撞可伸缩腿式水下采油树防拖网框架,包括上棱台框架体、下棱台框架体、伸缩腿部机构和缓冲机构；上棱台框架体和下棱台框架体呈上下叠加设置,在下棱台框架体上且沿其棱边设置多个伸缩腿部机构；缓冲机构设置在上棱台框架体和下棱台框架体的交接处；伸缩腿部机构包括外支撑腿、内支撑腿、防沉固定部、伸缩结构和下限位结构；外支撑腿沿下棱台框架体的棱边设置；内支撑腿通过伸缩结构伸缩设置在外支撑腿内；防沉固定部固定设置在内支撑腿的末端,并被配置为紧抓海床泥面并限制伸缩腿部机构在海床泥面的下陷；下限位结构设置在外支撑腿和内支撑腿之间,以将内支撑腿限制于外支撑腿内。(The invention discloses a buffer anti-collision telescopic leg type anti-trawling net frame for an underwater Christmas tree, which comprises an upper prismatic table frame body, a lower prismatic table frame body, a telescopic leg mechanism and a buffer mechanism, wherein the upper prismatic table frame body is provided with a first frame; the upper prismatic table frame body and the lower prismatic table frame body are vertically overlapped, and a plurality of telescopic leg mechanisms are arranged on the lower prismatic table frame body and along the edges of the lower prismatic table frame body; the buffer mechanism is arranged at the joint of the upper terrace frame body and the lower terrace frame body; the telescopic leg mechanism comprises an outer supporting leg, an inner supporting leg, an anti-sinking fixing part, a telescopic structure and a lower limiting structure; the outer supporting legs are arranged along the edges of the lower prismatic table frame body; the inner supporting leg is telescopically arranged in the outer supporting leg through a telescopic structure; the anti-sinking fixing part is fixedly arranged at the tail end of the inner supporting leg and is configured to tightly grab the mud surface of the seabed and limit the sinking of the telescopic leg mechanism on the mud surface of the seabed; the lower limiting structure is arranged between the outer supporting leg and the inner supporting leg so as to limit the inner supporting leg in the outer supporting leg.)

1. The utility model provides a scalable leg formula of buffering anticollision is production tree under water and is prevented trawl net frame which characterized in that: the device comprises an upper terrace frame body, a lower terrace frame body, a telescopic leg mechanism and a buffer mechanism; the upper terrace frame body and the lower terrace frame body are vertically overlapped, and a plurality of telescopic leg mechanisms are arranged on the lower terrace frame body and along the edges of the lower terrace frame body; the buffer mechanism is arranged at the joint of the upper terrace frame body and the lower terrace frame body and is configured to relieve the impact force of an impact object on the upper terrace frame body and between the upper terrace frame body and the lower terrace frame body;

the telescopic leg mechanism comprises an outer supporting leg, an inner supporting leg, an anti-sinking fixing part, a telescopic structure and a lower limiting structure; the outer supporting legs are arranged along the edges of the lower terrace frame body; the inner supporting leg is telescopically arranged in the outer supporting leg through the telescopic structure; the anti-sinking fixing part is fixedly arranged at the tail end of the inner supporting leg and is configured to tightly grab the mud surface of the seabed and limit the sinking of the telescopic leg mechanism on the mud surface of the seabed; the lower limit structure is arranged between the outer support leg and the inner support leg to limit the inner support leg within the outer support leg;

the telescopic structure comprises a telescopic cavity, inclined teeth, a pawl, an elastic piece and a traction piece; the telescopic cavity is formed in the outer supporting leg and penetrates through the tail end of the outer supporting leg, a plurality of helical teeth are arranged on one side of the inner supporting leg at intervals along the length direction of the inner supporting leg, the non-return direction of the helical teeth is the direction in which the inner supporting leg extends into the outer supporting leg, the pawl can rotate relative to the side wall of the telescopic cavity and is switched between two states of working and retracting, when the pawl works, the pawl is matched with the helical teeth, when the pawl retracts, the minimum distance from the pawl to the axis of the telescopic cavity is greater than the radius of an excircle circle of the inner supporting leg, the elastic piece is arranged between the pawl and the telescopic cavity, the elastic piece always applies external force for keeping the working state to the pawl, one end of the pulling piece is connected with the pawl, and the other end of the pulling piece extends out of the outer supporting leg, the pull member can pull the pawl to the retracted state.

2. The anti-trawl framework of buffering anti-collision telescopic leg type underwater Christmas tree of claim 1, wherein: set up the opening on the lateral wall in flexible chamber the outer wall of outer support leg just corresponds the open position sets up the mounting groove, the upper end of pawl is rotated and is set up in the opening, the elastic component sets up between the lower extreme of pawl and the lateral wall of mounting groove, the other end of tractive piece is certainly the opening stretches out the outside of outer support leg.

3. The anti-trawl framework of buffering anti-collision telescopic leg type underwater Christmas tree of claim 1, wherein: the anti-sinking fixing part comprises a fixing plate fixedly connected to the tail ends of the supporting legs and a plurality of tip parts arranged on the bottom surface of the fixing plate in a protruding mode.

4. The anti-trawl framework of buffering anti-collision telescopic leg type underwater Christmas tree of claim 1, wherein: the lower limit structure comprises a limit groove and a limit block, the limit groove and the helical teeth are arranged back to back on the other side of the inner supporting leg, the limit block is close to the tail end of the outer supporting leg and embedded in the side wall of the outer supporting leg, and the limit block is in sliding fit with the limit groove.

5. The anti-trawl framework of buffering anti-collision telescopic leg type underwater Christmas tree of claim 1, wherein: go up the four corners position of terrace with edge frame body handing-over department and arrange four buffer gear, buffer gear includes first mounting groove, second mounting groove and elastomeric cushioning spare go up the bottom four corners of terrace with edge frame body and set up four first mounting grooves the top four corners of terrace with edge frame body sets up four second mounting grooves down, the position one-to-one of first mounting groove and second mounting groove, elastomeric cushioning spare sets up at mutual correspondence in first mounting groove and the second mounting groove.

6. The anti-trawl framework of buffering anti-collision telescopic leg type underwater Christmas tree of claim 1, wherein: four buffer mechanisms are arranged at four corners of the joint of the upper prismatic table frame body and the lower prismatic table frame body; the buffering mechanism comprises elastic buffering parts, a first guide column, a buffering top seat, a buffering middle seat and a buffering base, the buffering top seat is formed at the bottom of the upper terrace frame body, the buffering base and the buffering top seat are correspondingly formed at the top of the lower terrace frame body, the buffering middle seat is arranged between the buffering top seat and the buffering base, and a plurality of elastic buffering parts are arranged between the buffering top seat and the buffering middle seat as well as between the buffering middle seat and the buffering base; wear to establish a plurality ofly between buffering footstock, buffering middle seat and the buffering base first guide post, each the upper end of first guide post is fixed in through the fastener the top of buffering footstock, each the lower extreme of first guide post is fixed in through the fastener the bottom of buffering base, a plurality of can be followed to the buffering middle seat first guide post slides from top to bottom.

7. The anti-trawl frame for buffering anti-collision telescopic leg type underwater Christmas tree as claimed in claim 5 or 6, wherein: a plurality of second guide columns are movably arranged between the lower edge of the side face of the upper terrace frame body and the upper edge of the side face of the lower terrace frame body corresponding to the lower terrace frame body at intervals in a penetrating mode, the upper ends of the second guide columns are fixed to the lower edge of the side face of the upper terrace frame body through fasteners, and the lower ends of the second guide columns are fixed to the upper edge of the side face of the lower terrace frame body through fasteners.

8. The anti-trawl framework of claim 6, wherein: the number of the elastic buffer parts between the buffering top seat and the buffering middle seat is smaller than that between the buffering middle seat and the buffering base.

9. The anti-trawl framework of buffering anti-collision telescopic leg type underwater Christmas tree of claim 1, wherein: the upper prismatic table frame body comprises first trapezoidal hollow side plates and a top plate, the four first trapezoidal hollow side plates are spliced to form a hollow prismatic table frame, and the hollow prismatic table frame is connected with the lower prismatic table frame body; the top plate is arranged at the top of the hollow prismatic stand and is connected with the upper periphery of the hollow prismatic stand, a through hole is formed in the center of the top plate, and the size of the through hole is matched with that of the underwater oil production tree cap;

the terrace with edge frame body is four terrace with edges structure down, including constituting down four trapezoidal fretwork curb plates of second of terrace with edges frame body four sides, each the trapezoidal fretwork curb plate of second with correspond the side outer support leg and last terrace with edges frame body fixed connection.

10. The anti-trawl framework of buffering anti-collision telescopic leg type underwater Christmas tree of claim 1, wherein: four lifting lugs are arranged at four corners of the joint between the upper prismatic table frame body and the lower prismatic table frame body.

Technical Field

The invention relates to a trawl prevention framework, in particular to a buffering anti-collision telescopic leg type trawl prevention framework for an underwater Christmas tree, and belongs to the field of underwater production facilities.

Background

The underwater production system has obvious advantages in the aspects of developing deep-water oil and gas fields and shallow-water oil and gas fields, and is widely applied to the field of underwater oil and gas development. The subsea tree is an important component of a subsea production system, and is a key structural device for controlling and regulating oil well production in a subsea production facility. With the rapid development of marine fishery fishing modes and fishing equipment, the underwater Christmas tree in a fishery fishing operation area is threatened by the towing of a fishing net at all times, a shallow water area is particularly obvious, and the towing of the fishing net on the underwater Christmas tree can cause great influence on fishery fishing and an underwater production system; meanwhile, larger benthos and seabed garbage can affect the underwater Christmas tree. Once the christmas tree fails, the entire production system cannot operate smoothly.

The trawl net frame is prevented to current subsea tree is a structure of similar trapezoidal terrace with edge, can slide the function through the slope with the help of terrace with edge structure side realization trawl net, lets the Christmas tree not receive the influence that the fishing net draged. The existing protection frame is designed for fishing net towing protection by only adopting a part of DNV specifications: the design that the fishing net can slide is carried out under the condition that a sea limited area cannot be established to prevent the fishing operation of the bottom-supporting fishing net from entering a relevant area, even if the fishing net can smoothly slide through a protection frame of an underwater structure, the influence of the fishing net on the underwater structure is avoided; the existing protecting frame for preventing trawling of the underwater Christmas tree has many disadvantages in other aspects, such as: firstly, the influence of the impact load of the fishing net planker on the underwater structure protection frame is not considered and calculated, secondly, the top of the fishing net planker is of a closed plane structure, so that the impact of falling objects can be avoided, but the accumulation of the falling objects cannot be avoided; bearing all impact force when the top is impacted; fourthly, the four support legs have no tips and limit structures and cannot play a role in fixing the support legs with the seabed; the legs of the frame have no foldable or telescopic structure, so that the space occupied by the frame when the moon pool is lowered is large; sixthly, the ROV robot does not enter the side surface, so that the maintenance or operation of the Christmas tree is inconvenient; the whole structure has no hollow structure and is heavier.

Disclosure of Invention

In view of the above problems, the invention aims to provide a buffering anti-collision telescopic leg type anti-trawling frame for an underwater Christmas tree, which can be used for preventing the influence of a fishing net on underwater structures such as the underwater Christmas tree and the like and overcoming the defects of the conventional protection frame.

In order to achieve the purpose, the invention adopts the following technical scheme: a buffer anti-collision telescopic leg type anti-trawling net frame for an underwater Christmas tree comprises an upper prismatic table frame body, a lower prismatic table frame body, a telescopic leg mechanism and a buffer mechanism; the upper terrace frame body and the lower terrace frame body are vertically overlapped, and a plurality of telescopic leg mechanisms are arranged on the lower terrace frame body and along the edges of the lower terrace frame body; the buffer mechanism is arranged at the joint of the upper terrace frame body and the lower terrace frame body and is configured to relieve the impact force of an impact object on the upper terrace frame body and between the upper terrace frame body and the lower terrace frame body;

the telescopic leg mechanism comprises an outer supporting leg, an inner supporting leg, an anti-sinking fixing part, a telescopic structure and a lower limiting structure; the outer supporting legs are arranged along the edges of the lower terrace frame body; the inner supporting leg is telescopically arranged in the outer supporting leg through the telescopic structure; the anti-sinking fixing part is fixedly arranged at the tail end of the inner supporting leg and is configured to tightly grab the mud surface of the seabed and limit the sinking of the telescopic leg mechanism on the mud surface of the seabed; the lower limit structure is arranged between the outer support leg and the inner support leg to limit the inner support leg within the outer support leg;

the telescopic structure comprises a telescopic cavity, inclined teeth, a pawl, an elastic piece and a traction piece; the telescopic cavity is formed in the outer supporting leg and penetrates through the tail end of the outer supporting leg, a plurality of helical teeth are arranged on one side of the inner supporting leg at intervals along the length direction of the inner supporting leg, the non-return direction of the helical teeth is the direction in which the inner supporting leg extends into the outer supporting leg, the pawl can rotate relative to the side wall of the telescopic cavity and is switched between two states of working and retracting, when the pawl works, the pawl is matched with the helical teeth, when the pawl retracts, the minimum distance from the pawl to the axis of the telescopic cavity is greater than the radius of an excircle circle of the inner supporting leg, the elastic piece is arranged between the pawl and the telescopic cavity, the elastic piece always applies external force for keeping the working state to the pawl, one end of the pulling piece is connected with the pawl, and the other end of the pulling piece extends out of the outer supporting leg, the pull member can pull the pawl to the retracted state.

In some embodiments, an opening is provided on a side wall of the telescopic cavity, a mounting groove is provided on an outer wall of the outer support leg and corresponding to the opening, an upper end of the pawl is rotatably disposed in the opening, the elastic member is disposed between a lower end of the pawl and the side wall of the mounting groove, and the other end of the pulling member extends out of the outer support leg from the opening.

In some embodiments, the anti-sinking fixing part includes a fixing plate fixedly connected to the end of the supporting leg, and a plurality of tip parts protrudingly disposed on the bottom surface of the fixing plate.

In some embodiments, the lower limiting structure comprises a limiting groove and a limiting block, the limiting groove and the helical teeth are arranged on the other side of the inner supporting leg in a back-to-back manner, the limiting block is embedded in the side wall of the outer supporting leg close to the tail end of the outer supporting leg, and the limiting block is in sliding fit in the limiting groove.

In some embodiments, four buffering mechanisms are arranged at four corners of a junction of the upper prismatic table frame body and the lower prismatic table frame body, each buffering mechanism comprises a first mounting groove, a second mounting groove and an elastic buffering member, four first mounting grooves are arranged at four corners of the bottom of the upper prismatic table frame body, four second mounting grooves are arranged at four corners of the top of the lower prismatic table frame body, the first mounting grooves and the second mounting grooves are in one-to-one correspondence in position, and the elastic buffering members are arranged in the first mounting grooves and the second mounting grooves which correspond to each other.

In some embodiments, four of the buffer mechanisms are arranged at four corners of the junction of the upper and lower terrace frame bodies; the buffering mechanism comprises elastic buffering parts, a first guide column, a buffering top seat, a buffering middle seat and a buffering base, the buffering top seat is formed at the bottom of the upper terrace frame body, the buffering base and the buffering top seat are correspondingly formed at the top of the lower terrace frame body, the buffering middle seat is arranged between the buffering top seat and the buffering base, and a plurality of elastic buffering parts are arranged between the buffering top seat and the buffering middle seat as well as between the buffering middle seat and the buffering base; wear to establish a plurality ofly between buffering footstock, buffering middle seat and the buffering base first guide post, each the upper end of first guide post is fixed in through the fastener the top of buffering footstock, each the lower extreme of first guide post is fixed in through the fastener the bottom of buffering base, a plurality of can be followed to the buffering middle seat first guide post slides from top to bottom.

In some embodiments, a plurality of second guide posts are movably inserted between the lower edge of the side face of the upper terrace frame body and the upper edge of the side face of the lower terrace frame body corresponding to the lower terrace frame body at intervals, the upper ends of the second guide posts are fixed on the lower edge of the side face of the upper terrace frame body through fasteners, and the lower ends of the second guide posts are fixed on the upper edge of the side face of the lower terrace frame body through fasteners.

In some embodiments, the number of the elastic buffer members between the buffering top seat and the buffering middle seat is less than that between the buffering middle seat and the buffering base.

In some embodiments, the upper prismoid frame body comprises first trapezoidal hollowed-out side plates and a top plate, the four first trapezoidal hollowed-out side plates are spliced to form a hollow prismoid, and the hollow prismoid is connected with the lower prismoid frame body; the top plate is arranged at the top of the hollow prismatic stand and is connected with the upper periphery of the hollow prismatic stand, a through hole is formed in the center of the top plate, and the size of the through hole is matched with that of the underwater oil production tree cap;

the terrace with edge frame body is four terrace with edges structure down, including constituting down four trapezoidal fretwork curb plates of second of terrace with edges frame body four sides, each the trapezoidal fretwork curb plate of second with correspond the side outer support leg and last terrace with edges frame body fixed connection.

In some embodiments, four lifting lugs are arranged at four corners of the junction between the upper and lower terrace frame bodies.

By adopting the technical scheme, the invention has the following advantages: the invention provides a buffer anti-collision telescopic leg type anti-trawling frame for an underwater Christmas tree, which comprises an upper prismatic table frame body, a lower prismatic table frame body, a telescopic leg mechanism and a buffer mechanism, wherein the telescopic leg mechanism comprises an outer support leg, an inner support leg, an anti-sinking fixing part, a telescopic structure and a lower limit structure; the buffer mechanism can slow down the impact of sea waves or other objects on the frame, reduce the damage of an impact object on the upper protection frame, reduce the collision between the upper terrace frame body and the lower terrace frame body, prolong the service life of the trawl prevention frame and protect the safety of the underwater Christmas tree; the anti-sinking fixing part tightly grabs the mud surface of the seabed without sinking, namely the adhesive force of the frame on the seabed is enhanced, and the stability of the whole frame arranged on the seabed is improved; the upper prismatic table frame body is of a hollow structure, impact and accumulation of falling objects can be prevented, and a through hole is reserved in a top plate of the upper prismatic table frame body, so that well repair can be realized without moving the frame; the whole frame is nearly of a hollow structure, and the influence of water pressure on the whole frame in the transfer process is small. Therefore, the framework of the invention can not only avoid the influence of the fishing net on underwater structures such as an underwater Christmas tree and the like, and continuously work, but also overcome the defects of the existing protection framework and ensure the stable operation of the whole production system.

Drawings

FIG. 1 is a schematic illustration of a cushioned crash-proof telescoping legged subsea tree trawl prevention frame according to an embodiment of the present disclosure;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a top view of FIG. 1;

FIG. 4 is a schematic diagram of a telescoping leg mechanism in a bumper crash proof telescoping leg subsea tree trawl door frame according to an embodiment of the present disclosure;

fig. 5 is a schematic view of the telescoping leg mechanism of fig. 4 from another perspective;

FIG. 6 is a partial schematic view of a cushioning mechanism in a trawl prevention frame of a cushioned crash telescoping legged subsea tree according to one embodiment of the present disclosure;

FIG. 7 is a schematic cross-sectional view of a cushioning mechanism in a trawl prevention frame of a cushioned crash telescoping legged subsea tree according to an embodiment of the present disclosure;

FIG. 8 is a schematic view of another cushioning mechanism in a buff bump guard telescoping legged subsea tree trawl door frame according to an embodiment of the present disclosure;

fig. 9 is another schematic view of the damper mechanism of fig. 8.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "inner", "outer", "transverse", "vertical", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the system or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used to define elements only for convenience in distinguishing between the elements, and unless otherwise stated have no special meaning and are not to be construed as indicating or implying any relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, 4 and 5, an embodiment of the present disclosure provides a buffer anti-collision telescopic leg type underwater Christmas tree trawl-proof frame, which includes an upper terrace frame body 1, a lower terrace frame body 2, a telescopic leg mechanism 3 and a buffer mechanism 4; the upper terrace frame body 1 and the lower terrace frame body 2 are arranged in an up-down overlapping manner, and a plurality of telescopic leg mechanisms 3 are arranged on the lower terrace frame body 2 and along the edge of the lower terrace frame body; the buffer mechanism 4 is arranged at the joint of the upper terrace frame body 1 and the lower terrace frame body 2;

the telescopic leg part mechanism 3 comprises an outer supporting leg 31, an inner supporting leg 32, an anti-sinking fixing part 33, a telescopic structure 34 and a lower limit structure 35; the outer support legs 31 are arranged along the edges of the lower terrace frame body 2; the inner supporting leg 32 is telescopically arranged in the outer supporting leg 31 through a telescopic structure 34; the anti-sinking fixing part 33 is fixedly arranged at the tail end of the inner supporting leg 32 and is configured to tightly grab the mud surface of the seabed and limit the sinking of the telescopic leg mechanism 3 on the mud surface of the seabed; a lower limiting structure 35 is disposed between the outer support leg 31 and the inner support leg 32 near the end of the outer support leg 31 to limit the inner support leg 32 within the outer support leg 31;

the telescopic structure 34 comprises a telescopic cavity 341, a helical tooth 342, a pawl 343, an elastic member 344 and a pulling member (not shown in the figure); the telescopic cavity 341 is formed in the outer support leg 31 and penetrates through the tail end of the outer support leg 31, a plurality of inclined teeth 342 are arranged at intervals on one side of the inner support leg 32 along the length direction of the inner support leg 32, the non-return direction of the inclined teeth 342 is the direction in which the inner support leg 32 extends into the outer support leg 31, the pawl 343 can rotate relative to the side wall of the telescopic cavity 341 and is switched between two states of working and retracting, when the pawl 343 works, the pawl 343 is matched with the inclined teeth 342, when the pawl 343 retracts, the minimum distance from the pawl 343 to the axis of the telescopic cavity 341 is larger than the radius of an excircle circle of the inner support leg 32, the elastic piece 344 is arranged between the pawl 343 and the telescopic cavity 341, the elastic piece 344 always applies external force for keeping the working state to the pawl 343, one end of the pulling piece is connected with the pawl 343, the other end of the pulling piece extends out of the outer support leg 31, and.

The buffer mechanism 4 is configured to alleviate the impact of the impact object on the upper terrace frame body 1 and between the upper terrace frame body and the lower terrace frame body, and prolong the service life of the frame.

In some examples, as shown in fig. 5, an opening 345 is provided on a side wall of the telescopic chamber 341, a mounting groove 346 is provided on an outer wall of the outer support leg 31 at a position corresponding to the opening 345, an upper end of the pawl 343 is rotatably provided in the opening 345, an elastic member 344 is provided between a lower end of the pawl 343 and the side wall of the mounting groove 346, and the other end of the pulling member protrudes from the opening 345 to the outside of the outer support leg 31.

In some examples, as shown in fig. 2 and 5, the anti-sinking fixing portion 33 includes a fixing plate 331 fixedly connected to the end of the support leg 32, and a plurality of cylindrical tip portions 332 protrudingly disposed on the bottom surface of the fixing plate 331, whereby the plurality of cylindrical tip portions 332 are inserted into the mud surface of the seabed, and the fixing rod 331 is pressed against the mud surface of the seabed, so that the contact area of the support leg portion 32 and the mud surface of the seabed is increased, so that the support leg portion 32 can tightly grip the mud surface of the seabed without sinking, i.e., so as to enhance the adhesion of the frame to the seabed.

In some examples, as shown in fig. 4, the lower limiting structure 35 includes a limiting groove 351 and a limiting block 352, the limiting groove 351 and the helical tooth 332 are arranged on the other side of the inner supporting leg 32 in a back-to-back manner, the limiting block 352 is embedded in the side wall of the outer supporting leg 31 close to the end thereof, and the limiting block 352 is slidably fitted in the limiting groove 351. Therefore, when the inner supporting leg 32 extends downwards relative to the outer supporting leg 31, the sliding fit of the limiting block 352 and the limiting groove 351 plays a guiding role to limit the inner supporting leg 32 to do linear motion relative to the outer supporting leg 31, when the inner supporting leg 32 extends downwards to the lower limit position, the stopping function of the limiting block 352 can prevent the inner supporting leg 32 from extending out of the outer supporting leg 31 accidentally, and meanwhile, the inclined teeth 332 are matched with the pawls 333 to prevent the inner supporting leg 32 from retracting.

In some examples, as shown in fig. 6 to 7, four buffer mechanisms 4 are arranged at substantially four corners at the junction of the upper and lower terrace frame bodies 1 and 2; the buffer mechanism 4 includes a first mounting groove 41, a second mounting groove 42, and elastic buffer members 43, four first mounting grooves 41 are provided at four corners of the bottom of the upper terrace frame 1, four second mounting grooves 42 are provided at four corners of the top of the lower terrace frame 2, the positions of the first mounting grooves 41 and the second mounting grooves 42 are in one-to-one correspondence, and the elastic buffer members 43 are provided in the first mounting grooves 41 and the second mounting grooves 42 corresponding to each other.

In some examples, as shown in fig. 8 to 9, four cushion mechanisms 4 are arranged at substantially four corners at the junction of the upper and lower terrace frame bodies 1 and 2, the cushion mechanisms 4 include elastic cushions 43, first guide posts 44, cushion footstocks 45, cushion middle seats 46, and cushion bases 47, the cushion footstocks 45 are formed at the bottom of the upper terrace frame body 1, the cushion bases 47 are formed at the top of the lower terrace frame body 2 in correspondence with the positions of the cushion footstocks 45, the cushion middle seats 46 are arranged between the cushion footstocks 45 and the cushion bases 47, and a plurality of elastic cushions 43 are provided between the cushion footstocks 45 and the cushion middle seats 46, and the cushion bases 47; wear to establish a plurality of first guide post 44 between buffering footstock 45, buffering middle seat 46 and buffering base 47, the upper end of each first guide post 44 is fixed in the top of buffering footstock 45 through the fastener, and the lower extreme of each first guide post 44 is fixed in the bottom of buffering base 47 through the fastener, and buffering middle seat 46 can slide from top to bottom along a plurality of first guide post 44. From this, when preventing that trawl frame receives the impact or the striking of wave or other objects, a plurality of elastomeric cushioning spare 43 between buffering footstock 45 and the buffering middle base 46 provide the first level buffering, a plurality of elastomeric cushioning spare 43 between buffering middle base 46 and the buffering base 47 provide the second level buffering, with the impact that absorbs the impact and produce, and then reduce the destruction of impact to upper portion protection frame, also reduce the collision between terrace with edge frame body 1 and the terrace with edge frame body 2 down, the life of extension trawl frame, in addition, a plurality of first guide posts 44 provide spacing effect from top to bottom, the horizontal motion between terrace with edge frame body 1 and the terrace with edge frame body 2 down is gone up in the restriction, and then play the effect of protection christmas tree.

In some examples, a plurality of second guide posts 48 are movably inserted between the lower edge of the side surface of the upper terrace frame body 1 and the upper edge of the side surface of the lower terrace frame body 2 corresponding to the lower terrace frame body 1 at intervals, the upper ends of the second guide posts 48 are fixed on the lower edge of the side surface of the upper terrace frame body 1 through fasteners, the lower ends of the second guide posts 48 are fixed on the upper edge of the side surface of the lower terrace frame body 2 through fasteners, and the plurality of second guide posts 48 between the upper terrace frame body 1 and the lower terrace frame body 2 play a role in limiting the upper and lower directions, so that the horizontal movement between the upper terrace frame body 1 and the lower terrace frame body 2 is further limited.

In some examples, the number of the elastic buffer members 43 between the top buffer base 45 and the middle buffer base 46 is smaller than the number of the elastic buffer members 43 between the middle buffer base 46 and the bottom buffer base 47, for example, 6 elastic buffer members 43 are uniformly arranged between the top buffer base 45 and the middle buffer base 46, and 10 elastic buffer members 43 are uniformly arranged between the middle buffer base 46 and the bottom buffer base 47; the elastic buffer member 43 between the buffering footstock 45 and the buffering middle seat 46 is small in quantity, is easy to deform due to collision, can realize the buffering effect quickly, the quantity of the elastic buffer member 43 between the buffering middle seat 46 and the buffering base 47 is relatively large, deformation is not easy to occur, the elastic buffer member 43 can be used for buffering upper stress, the rebound of the elastic buffer member 43 between the buffering footstock 45 and the buffering middle seat 46 is reduced, and the buffering effect is better played.

In some examples, the elastic buffer 43 employs a buffer spring.

In some examples, as shown in fig. 2 and 3, the upper terrace frame body 1 includes first trapezoidal hollowed side plates 11 and a top plate 12, the four first trapezoidal hollowed side plates 11 are spliced to form a hollow terrace frame, and the hollow terrace frame is connected with the lower terrace frame body 1; roof 12 sets up at the top of cavity arris platform frame to be connected with the last periphery of cavity arris platform frame, the through-hole is seted up at roof 12's center, and the through-hole size can be designed and the big or small looks adaptation of oil production tree cap under water, in order to make things convenient for the well intervention of transferring, realize not moving the frame alright maintain.

In some examples, as shown in fig. 3, the lower frustum frame 2 has a quadrangular frustum structure, and includes four trapezoidal hollowed-out side plates 21 forming four sides of the lower frustum frame 2, and each trapezoidal hollowed-out side plate 21 is fixedly connected to the outer support leg 31 and the upper frustum frame 1 on the corresponding side.

In some examples, as shown in fig. 1 and 3, four lifting lugs 5 are arranged at substantially four corners of the junction between the upper terrace frame body 1 and the lower terrace frame body 2, and the lifting lugs may be round steel lifting lugs, steel plate lifting lugs, and the like, so as to realize the frame lowering through a steel wire cable.

The present invention has been described with reference to the above embodiments, and the structure, arrangement, and connection of the respective members may be changed. On the basis of the technical scheme of the invention, the improvement or equivalent transformation of the individual components according to the principle of the invention is not excluded from the protection scope of the invention.