CN219955021U - Quick-tightening manhole structure of marine low-temperature storage tank - Google Patents
Quick-tightening manhole structure of marine low-temperature storage tank Download PDFInfo
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- CN219955021U CN219955021U CN202321039462.5U CN202321039462U CN219955021U CN 219955021 U CN219955021 U CN 219955021U CN 202321039462 U CN202321039462 U CN 202321039462U CN 219955021 U CN219955021 U CN 219955021U
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- manhole cover
- welded
- shell ring
- quick
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- 238000007789 sealing Methods 0.000 claims abstract description 49
- 230000003014 reinforcing effect Effects 0.000 claims description 21
- 230000005540 biological transmission Effects 0.000 claims description 14
- 239000000428 dust Substances 0.000 claims description 13
- 230000003287 optical effect Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 description 10
- 238000012423 maintenance Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/32—Hydrogen storage
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- Pressure Vessels And Lids Thereof (AREA)
Abstract
The utility model discloses a quick-tightening manhole structure of a marine low-temperature storage tank, which comprises the following components: the inner tank body and the outer tank body are welded with an inner sealing head on the inner tank body, an outer sealing head is welded on the outer tank body, an inner manhole is formed in the inner sealing head, an inner shell ring is welded on the inner manhole, an inner manhole cover is sealed at the bottom of the inner shell ring, an inner quick locking mechanism is arranged between the inner shell ring and the inner manhole cover, an outer manhole is formed in the outer sealing head, an outer shell ring is welded on the outer manhole, the outer shell ring is welded with the inner shell ring, an outer manhole cover is sealed at the top of the outer shell ring, a vacuumizing tube is arranged on the outer manhole cover, a vacuum valve is connected on the vacuumizing tube, and an outer quick locking mechanism is arranged between the outer shell ring and the outer manhole cover. The utility model can rapidly plug the manhole and can improve the sealing performance between the inner manhole cover and the inner cylindrical shell section and between the outer manhole cover and the outer cylindrical shell section.
Description
Technical Field
The utility model relates to the field of pressure vessels, in particular to a quick-tightening manhole structure of a marine low-temperature storage tank.
Background
The low-temperature storage tank is of a double-layer structure and mainly comprises an inner tank body and an outer tank body, an inner sealing head is welded on the inner tank body, an outer sealing head is welded on the outer tank body, the inner tank body is sleeved in the outer tank body and fixed through a supporting piece, and an interlayer between the inner tank body and the outer tank body is vacuumized, so that the heat insulation performance of the inner tank body is guaranteed. In order to facilitate the overhaul and maintenance of the low-temperature storage tank in the later period, a manhole is required to be formed in the low-temperature storage tank, and a manhole cover is arranged on the manhole, the conventional manhole covers are all connected through bolts, but the diameter of the marine low-temperature storage tank is large, workers need to enter the inner tank body during the overhaul and maintenance, the size of the manhole needs to be ensured to meet the passing of the workers with normal heights, so that the manhole diameter of the marine low-temperature storage tank is large, if the manhole cover is connected in a traditional bolt tightening mode, the operation is inconvenient and complicated, the manhole cover needs to be ensured to be sealed and attached to the manhole, so that when the bolts are screwed, the diagonal screwing method needs to be used, the stress of each fastening point on the manhole cover is even, so that the manhole cover can be sealed on the manhole, but the diagonal screwing method takes time when the implementation, the diagonal screwing method is to screw a first bolt, screw a third of the diagonal bolt, screw a second third of the diagonal bolt, and screwing the other diagonal bolts, and the diagonal screwing method is performed until all the diagonal bolts are all the times are sequentially screwed. The manhole cover with smaller diameter can be quickly covered on the manhole by adopting a diagonal screwing method, but when the manhole cover with larger diameter is screwed by adopting the diagonal screwing method, the lower-position bolt is good in operation, when the higher-position bolt is screwed, the worker is required to climb up, so that time is wasted, the labor intensity of the worker is increased, the tightening force born by each bolt cannot be ensured to be consistent when the diagonal screwing method is carried out, the manhole cover is easy to deform slightly due to uneven stress, leakage is easy to occur after long-time use, and the low-temperature storage tank is seriously scrapped.
Disclosure of Invention
The utility model aims to provide a quick-tightening manhole structure of a marine low-temperature storage tank, which can quickly plug a manhole and has excellent sealing effect.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: a fast-tightening manhole structure of a marine cryogenic tank, comprising: the inner tank body and the outer tank body are welded with an inner sealing head on the inner tank body, an outer sealing head is welded on the outer tank body, an inner manhole is formed in the inner sealing head, an inner shell ring is welded on the inner manhole, an inner manhole cover is sealed at the bottom of the inner shell ring, an inner quick locking mechanism is arranged between the inner shell ring and the inner manhole cover, an outer manhole is formed in the outer sealing head, an outer shell ring is welded on the outer manhole, the outer shell ring is sleeved on the inner shell ring and is welded with the inner shell ring, an outer manhole cover is sealed at the top of the outer shell ring, a vacuumizing pipe is arranged on the outer manhole cover, a vacuum valve is connected on the vacuumizing pipe, an outer quick locking mechanism is arranged between the outer shell ring and the outer manhole cover, the inner quick locking mechanism has the same structure as the outer quick locking mechanism, and the structure of the inner quick locking mechanism is as an example: the inner tube section is welded with an annular step, a plurality of threaded holes are uniformly distributed on the annular step along the circumference, a plurality of threaded rods which are aligned with the threaded holes one by one are rotationally arranged on the inner manhole cover, the threaded rods are in threaded connection with the corresponding threaded holes and then extend out of the annular step, locking nuts are in threaded connection with the threaded rods extending out of the annular step, the locking nuts are tightly fastened on the annular step, each threaded rod is fixedly connected with a sprocket wheel, each sprocket wheel is meshed with a transmission chain, a rotating shaft is rotationally arranged on the inner manhole cover, the sprocket wheels meshed with the transmission chain are fixedly connected on the rotating shaft, and the inner hexagonal caps are fixedly connected on the rotating shaft.
Further, in the quick tightening manhole structure of the marine low-temperature storage tank, the annular step on the outer shell section is welded on the outer side wall of the outer shell section, and the screw rod in the outer quick locking mechanism is connected with the threaded hole in the annular step on the outer shell section in a threaded manner; the annular step on the inner shell ring is welded on the inner side wall of the inner shell ring, a screw rod in the inner quick locking mechanism is connected with a threaded hole in the annular step on the inner shell ring in a threaded manner, a rotating shaft hole is formed in the annular step on the inner shell ring, and a rotating shaft on the inner manhole cover penetrates through the rotating shaft hole and extends upwards out of the annular step.
Further, in the quick-tightening manhole structure of the marine low-temperature storage tank, an outer low-temperature-resistant sealing gasket is arranged on the bottom wall of the outer manhole cover, the outer manhole cover is abutted against the outer shell section through the outer low-temperature-resistant sealing gasket to be sealed with the outer shell section, an inner low-temperature-resistant sealing gasket is arranged on the top wall of the inner manhole cover, and the inner manhole cover is abutted against the inner shell section through the inner low-temperature-resistant sealing gasket to be sealed with the inner shell section.
Further, the quick tightening manhole structure of the marine low-temperature storage tank comprises the dustproof cover, a sealing ring pad is arranged between the dustproof cover and the outer manhole cover, the dustproof cover and the outer manhole cover are fixed through bolts, two avoidance holes are formed in the dustproof cover, and a rotating shaft in the vacuumizing pipe and the outer quick locking mechanism respectively penetrates through the two avoidance holes and then extends outwards, and sealing rings are arranged in the two avoidance holes.
Further, in the fast tightening manhole structure of the marine low-temperature storage tank, a protection chain is connected between the inner shell ring and the inner manhole cover.
Further, in the quick-tightening manhole structure of the marine low-temperature storage tank, the annular groove is formed in the inner side wall of the bottom of the outer shell ring, and the inner shell ring is abutted against the annular groove of the outer shell ring and welded with the outer shell ring.
Further, in the quick tightening manhole structure of the marine low-temperature storage tank, the inner reinforcement ring is welded on the inner sealing head, sleeved on the inner cylinder section and welded with the inner cylinder section, the outer reinforcement ring is welded on the outer sealing head, sleeved on the outer cylinder section and welded with the outer cylinder section.
Further, in the quick-tightening manhole structure of the marine low-temperature storage tank, the transmission chain is meshed with the external cog teeth of the chain wheel on each screw rod, and the cog teeth on the inner side of the chain wheel on the rotating shaft are meshed with the transmission chain.
Further, the quick tightening manhole structure of the marine low-temperature storage tank, wherein the connection structure between the screw and the inner manhole cover is as follows: the inner manhole cover is provided with a bearing hole, the lower section of the screw rod is an optical axis section, a boss is arranged on the optical axis section, two pushing bearings are respectively sleeved on the optical axis sections positioned on the upper side and the lower side of the boss, the two pushing bearings are propped against the hole wall of the bearing hole, the bearing hole is connected with a cover plate, and the cover plate is propped against the pushing bearings positioned on the upper side of the boss.
Further, the quick tightening manhole structure of the marine low-temperature storage tank comprises an annular support column welded on the bottom wall of the inner manhole cover in the middle, a plurality of reinforcing ribs are uniformly distributed on the outer side wall of the annular support column along the circumference, the reinforcing ribs are welded on the bottom wall of the inner manhole cover, and each reinforcing rib is aligned with each screw rod in the inner quick locking mechanism one by one.
The utility model has the advantages that: the outer manhole cover and the inner manhole cover can be respectively and quickly installed on the outer cylinder section and the inner cylinder section through the outer quick locking mechanism and the inner quick locking mechanism, and the outer quick locking mechanism and the inner quick locking mechanism can respectively apply the same screwing force to the threads on the outer manhole cover and the inner manhole cover, so that the outer manhole cover and the inner manhole cover can be uniformly stressed, and the outer manhole cover and the inner manhole cover can be respectively and well attached to the outer cylinder section and the inner cylinder section, thereby obtaining better sealing performance, and the connection by using a diagonal screwing method is not needed, and the working efficiency is greatly improved; the screw rods on the outer quick locking mechanism and the inner quick locking mechanism are respectively in threaded connection with threaded holes on the annular steps on the outer barrel section and the inner barrel section, the locking nuts are in threaded connection with the screw rods, the locking nuts are tightly fastened on the annular steps, and the double threaded connection structure can improve the locking force between the screw rods and the annular steps, so that the connection strength between the outer manhole cover and the inner manhole cover and between the outer barrel section and the inner barrel section is improved; the vacuum pipe and the vacuum valve are arranged on the outer manhole cover, so that the vacuum pumping equipment can be matched to vacuumize the space between the inner cylinder section and the outer cylinder section, the vacuum degree between the inner cylinder section and the outer cylinder section can be kept consistent with the vacuum degree between the inner tank body and the outer tank body, and the heat preservation performance of the inner tank body is ensured.
Drawings
Fig. 1 is a schematic structural view of a quick-tightening manhole structure of a marine cryogenic tank according to the present utility model.
Fig. 2 is a partially enlarged schematic view of the structure in the direction a in fig. 1.
Fig. 3 is a partially enlarged schematic view of the B direction in fig. 1.
Fig. 4 is a schematic view of a part of the structure in the plan view in fig. 2.
Fig. 5 is a partially enlarged schematic view of the structure in the direction C in fig. 2.
Detailed Description
The technical scheme of the utility model is further described below with reference to the attached drawings and the preferred embodiments.
As shown in fig. 1 to 5, the quick-tightening manhole structure of the marine cryogenic tank according to the present utility model includes: the inner tank 1 and the outer tank 2 are characterized in that an inner sealing head 11 is welded on the inner tank 1, an outer sealing head 21 is welded on the outer tank 2, an inner manhole is arranged on the inner sealing head 11, an inner cylinder section 12 is welded on the inner manhole, an inner reinforcing ring 13 is welded on the inner sealing head 11, the inner reinforcing ring 13 is sleeved on the inner cylinder section 12 and welded with the inner cylinder section 12, an inner manhole cover 3 is sealed at the bottom of the inner cylinder section 12, a protection chain 14 is connected between the inner cylinder section 12 and the inner manhole cover 3, the protection chain 14 can prevent the inner manhole cover 3 from dropping to crush the inner tank 1 when the inner manhole cover 3 is disassembled, an inner low temperature resistant sealing pad 31 is arranged on the top wall of the inner manhole cover 3, the inner manhole cover 3 is abutted against the inner cylinder section 12 through the inner low temperature resistant sealing pad 31 in a sealing manner, an inner quick locking mechanism capable of quickly and flatly covering the inner manhole cover 3 on the inner cylinder section 12 is arranged between the inner cylinder section 12 and the inner manhole cover 3, an outer manhole is arranged on the outer sealing head 21, an outer cylinder section 22 is welded on the outer manhole, an outer reinforcing ring 23 is welded on the outer sealing head 21, the outer reinforcing ring 23 is sleeved on the outer cylinder section 22 and is welded with the outer cylinder section 22, the outer cylinder section 22 is sleeved on the inner cylinder section 12 and is welded with the inner cylinder section 12, an annular groove is arranged on the inner side wall at the bottom of the outer cylinder section 22, the inner cylinder section 12 is abutted against the annular groove of the outer cylinder section 22 and is welded with the outer cylinder section 22, the coaxiality between the inner cylinder section 12 and the outer cylinder section 22 can be ensured, the welding strength between the inner cylinder section 12 and the outer cylinder section 22 can be improved, an outer manhole cover 4 is sealed at the top of the outer cylinder section 22, an outer low-temperature-resistant sealing pad 41 is also arranged on the bottom wall of the outer manhole cover 4 and is abutted against the outer cylinder section 22 through the outer low-temperature-resistant sealing pad 41 to be sealed and jointed with the outer cylinder section 22, the outer manhole cover 4 is provided with a vacuum tube 42, the vacuum tube 42 is connected with a vacuum valve 43, an outer quick lock mechanism is arranged between the outer barrel section 22 and the outer manhole cover 4, the inner quick lock mechanism has the same structure as the outer quick lock mechanism, taking the inner quick lock mechanism as an example, and the structure of the inner quick lock mechanism is as follows: the inner shell ring 12 is welded with an annular step 5, a plurality of threaded holes are uniformly distributed on the annular step 5 along the circumference, a plurality of screws 32 aligned with the threaded holes one by one are rotatably arranged on the inner manhole cover 3, and the connecting structure between the screws 32 and the inner manhole cover 3 is as follows: the lower section of the screw rod 32 is an optical axis section, a boss 33 is arranged on the optical axis section, two pushing bearings 34 are respectively sleeved on the optical axis sections positioned on the upper side and the lower side of the boss 33, the two pushing bearings 34 are abutted against the hole wall of the bearing hole, a cover plate 35 is connected to the bearing hole, the cover plate 35 is abutted against the pushing bearings 34 positioned on the upper side of the boss 33, the screw rod 32 is connected with corresponding threaded holes in a threaded manner and then extends out of the annular step 5, a locking nut 51 is connected with the screw rod 32 extending out of the annular step 5 in a threaded manner, the locking nut 51 is tightly fastened on the annular step 5, the screw rod 32 is locked, a sprocket 36 is fixedly connected with each screw rod 32, each sprocket 36 is meshed with one transmission chain 52, the transmission chain 52 is meshed with the outside cog of the sprocket 36 on each screw rod 32, a rotating shaft 37 is rotatably arranged on the inner manhole cover 3, the cog of the inside of the sprocket 36 on the rotating shaft 37 is meshed with the transmission chain 52, and thus the six-piece chain 36 on the transmission chain 37 can be fastened on the rotating shaft 37. When the screw cap is installed, each screw rod 32 on the inner manhole cover 3 is aligned with each threaded hole one by one, then a worker inserts an inner hexagonal wrench into the inner hexagonal cap 38 to rotate the rotating shaft 37, the rotating shaft 37 drives the chain wheel 36 on the rotating shaft 37 to rotate, the chain wheel 36 drives the transmission chain 52 to move, the moving transmission chain 52 can drive the chain wheels 36 on all the screw rods 32 to synchronously and co-rotate through the chain transmission effect, each screw rod 32 is driven by the respective connected chain wheel 36 to simultaneously screw into the corresponding threaded hole, the inner manhole cover 3 can move in the axial direction of the inner barrel section 12 until the inner manhole cover is covered on the inner barrel section 12, as the screwing of each screw rod 32 is consistent, each fastening point on the inner manhole cover 3 is stressed uniformly, a good sealing effect can be achieved between the inner manhole cover 3 and the inner barrel section 12, then a locking nut 51 is screwed on the screw rod 32 extending out of the annular step 5, and the locking nut 51 is tightly locked on the annular step 5, so that the connection strength between the inner manhole cover 3 and the inner barrel section 12 is improved.
In this embodiment, the annular step on the outer shell section 22 is welded on the outer side wall of the outer shell section 22, the screw rod in the outer quick lock mechanism is connected with the threaded hole in the annular step on the outer shell section 22 in a threaded manner, the top wall of the outer manhole cover 4 is covered with the dust cover 44, a sealing ring pad 45 is arranged between the dust cover 44 and the outer manhole cover 4, the dust cover 44 and the outer manhole cover 4 are fixed by bolts, two avoidance holes are arranged on the dust cover 44, the rotary shafts in the vacuum tube 42 and the outer quick lock mechanism respectively penetrate through the two avoidance holes and then extend outwards, sealing rings are respectively arranged in the two avoidance holes, the sealing rings in the two avoidance holes are respectively attached to the rotary shafts in the vacuum tube 42 and the outer quick lock mechanism, so that external dust and moisture are prevented from entering into a transmission chain in the dust cover 44 to corrode the outer quick lock mechanism, when the dust cover 44 is fixed on the outer manhole cover 4, the outer manhole cover 4 can be placed on the ground, and therefore the dust cover 44 can be screwed by using a diagonal screwing method, and the sealing requirements between the dust cover 44 and the outer manhole cover 4 are not strictly equal to the stress scope; the annular step 5 on the inner shell ring 12 is welded on the inner side wall of the inner shell ring 12, the screw rod 32 in the inner quick lock mechanism is connected with the threaded hole in the annular step 5 on the inner shell ring 12 in a threaded manner, a rotating shaft hole is formed in the annular step 5 on the inner shell ring 12, the rotating shaft 37 on the inner manhole cover 3 penetrates through the rotating shaft hole to extend upwards to the annular step 5, the height of the rotating shaft 37 in the inner quick lock mechanism is greater than the height of the screw rod 32 in the inner quick lock mechanism + the height of the annular step 5 in the inner shell ring 12, and therefore when the screw rod 32 in the inner quick lock mechanism abuts against the threaded hole in the annular step 5 of the inner shell ring 12, the rotating shaft 37 in the inner quick lock mechanism can extend out of the annular step 5 of the inner shell ring 12 through the rotating shaft hole, and interference of the annular step 5 with an inner hexagonal wrench can not occur when the inner hexagonal wrench is used for moving the inner hexagonal cap 38 on the rotating shaft 37 in the inner hexagonal wrench.
Because the inner manhole cover 3 receives the negative pressure acting force between the inner cylindrical section 12 and the outer cylindrical section 22 and the positive pressure acting force in the inner tank 1, the directions of the two acting forces are the same, so the pressure born by the inner manhole cover 3 is extremely large, the structure of the inner manhole cover 3 needs to be reinforced, and the scheme adopted in the embodiment is as follows: the annular support column 6 is welded on the bottom wall of the inner manhole cover 3 in the middle, a plurality of reinforcing ribs 61 are uniformly distributed on the outer side wall of the annular support column 6 along the circumference, the reinforcing ribs 61 are welded on the bottom wall of the inner manhole cover 3, each reinforcing rib 61 is aligned with each screw rod 32 in the inner quick locking mechanism one by one, the reinforcing ribs 61 and the annular support column 6 are arranged to increase the compressive strength of the inner manhole cover 3, each reinforcing rib 61 is aligned with each screw rod 32 in the inner quick locking mechanism one by one, and the thickness of the inner manhole cover 3 at the bearing hole corresponding to each screw rod 32 is thinner, so that the compressive strength is lower, the thickness of the position can be complemented by the reinforcing ribs 61, and the integral compressive strength of the inner manhole cover 3 is improved.
The installation mode is as follows: when the outer tank body 2 is sleeved on the inner tank body 1, the outer tank body 2 and the inner tank body 1 are coaxial, an outer manhole is firstly formed on an outer end socket 21 of the outer tank body 2, then an inner manhole coaxial with an outer manhole is formed on an inner end socket 11 of the inner tank body 1, then an inner manhole cover 3 provided with an inner quick locking mechanism is conveyed into the inner tank body 1, then an inner cylindrical shell 12 and an inner reinforcing ring 13 are welded on the inner manhole, then an outer cylindrical shell 22 and the inner cylindrical shell 12 are clamped with each other, the outer cylindrical shell 22 and the inner cylindrical shell 12 are guaranteed to be coaxial, then the outer cylindrical shell 22 and the inner cylindrical shell 12 are welded on the outer manhole in a spot welding mode, the outer cylindrical shell 22 and the outer cylindrical shell 21 are fully welded, then an outer reinforcing ring 23 is welded between the outer cylindrical shell 21 and the outer cylindrical shell 22, then an annular step 5 with a threaded hole is welded on the inner side wall of the inner cylindrical shell 12, a group of staff use of sucking discs and the like to fit all the inner manhole covers 3 and the annular hole covers 3 on the inner cylindrical shell 12, and the threaded hole covers 4 are welded on the inner cylindrical shell 12, the threaded hole covers are further screwed into the threaded hole 4, and the threaded hole 4 are welded on the inner cylindrical shell 12, and the threaded hole covers are further screwed into the threaded hole 3 and the threaded hole 4 are welded on the inner cylindrical shell 12, and the threaded hole 3 and the threaded hole 4 are further screwed on the inner cylindrical shell 12.
In the actual use process, because the inner tank body 2 and the outer tank body 1 are to be vacuumized, when in use, the inner manhole cover 3 is sealed and covered on the inner cylinder section 12, the outer manhole cover 4 is sealed and covered on the outer cylinder section 22, the vacuum valve 43 is connected with the vacuumizing equipment, and the vacuumizing equipment vacuumizes the cavity between the inner cylinder section 12 and the outer cylinder section 22 through the vacuum valve 43 and the vacuumizing pipe 42, so that the vacuum degree of the cavity between the inner cylinder section 12 and the outer cylinder section 22 is kept consistent with the vacuum degree between the inner tank body 1 and the outer tank body 2. When maintenance is needed, the vacuum valve 43 is slowly opened, so that external air enters the cavity between the inner barrel section 12 and the outer barrel section 22, then the outer manhole cover 4 and the inner manhole cover 3 are sequentially opened, and then workers can enter the inner tank body 1 for maintenance, and the vacuum environment between the inner tank body 1 and the outer tank body 2 is not affected.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the utility model without departing from the spirit and scope of the utility model, which is intended to be covered by the claims.
Claims (10)
1. A fast-tightening manhole structure of a marine cryogenic tank, comprising: the inner tank body and the outer tank body are welded with an inner sealing head on the inner tank body, and an outer sealing head is welded on the outer tank body, and is characterized in that: an inner manhole is formed in the inner sealing head, an inner shell ring is welded on the inner manhole, an inner manhole cover is sealed at the bottom of the inner shell ring, an inner quick locking mechanism is arranged between the inner shell ring and the inner manhole cover, an outer manhole is formed in the outer sealing head, an outer shell ring is welded on the outer manhole, the outer shell ring is sleeved on the inner shell ring and is welded with the inner shell ring, an outer manhole cover is sealed at the top of the outer shell ring, a vacuumizing pipe is arranged on the outer manhole cover, a vacuum valve is connected on the vacuumizing pipe, an outer quick locking mechanism is arranged between the outer shell ring and the outer manhole cover, the inner quick locking mechanism has the same structure as the outer quick locking mechanism, and the inner quick locking mechanism is exemplified by the following structure: the inner tube section is welded with an annular step, a plurality of threaded holes are uniformly distributed on the annular step along the circumference, a plurality of threaded rods which are aligned with the threaded holes one by one are rotationally arranged on the inner manhole cover, the threaded rods are in threaded connection with the corresponding threaded holes and then extend out of the annular step, locking nuts are in threaded connection with the threaded rods extending out of the annular step, the locking nuts are tightly fastened on the annular step, each threaded rod is fixedly connected with a sprocket wheel, each sprocket wheel is meshed with a transmission chain, a rotating shaft is rotationally arranged on the inner manhole cover, the sprocket wheels meshed with the transmission chain are fixedly connected on the rotating shaft, and the inner hexagonal caps are fixedly connected on the rotating shaft.
2. The quick-tightening manhole structure of a marine cryogenic tank according to claim 1, wherein: the annular step on the outer cylinder section is welded on the outer side wall of the outer cylinder section, and a screw rod in the outer quick locking mechanism is connected with a threaded hole in the annular step on the outer cylinder section in a threaded manner; the annular step on the inner shell ring is welded on the inner side wall of the inner shell ring, a screw rod in the inner quick locking mechanism is connected with a threaded hole in the annular step on the inner shell ring in a threaded manner, a rotating shaft hole is formed in the annular step on the inner shell ring, and a rotating shaft on the inner manhole cover penetrates through the rotating shaft hole and extends upwards out of the annular step.
3. The quick-tightening manhole structure of a marine cryogenic tank according to claim 1, wherein: an outer low-temperature-resistant sealing gasket is arranged on the bottom wall of the outer manhole cover, the outer manhole cover is abutted against the outer shell ring through the outer low-temperature-resistant sealing gasket to be sealed with the outer shell ring, an inner low-temperature-resistant sealing gasket is arranged on the top wall of the inner manhole cover, and the inner manhole cover is abutted against the inner shell ring through the inner low-temperature-resistant sealing gasket to be sealed with the inner shell ring.
4. The quick-tightening manhole structure of a marine cryogenic tank according to claim 1, wherein: the top wall upper cover of the outer manhole cover is covered with a dust cover, a sealing ring pad is arranged between the dust cover and the outer manhole cover, the dust cover and the outer manhole cover are fixed through bolts, two avoidance holes are formed in the dust cover, and a rotating shaft in the vacuumizing tube and the outer quick locking mechanism respectively penetrates through the two avoidance holes and then extends outwards, and sealing rings are arranged in the two avoidance holes.
5. The quick-tightening manhole structure of the marine cryogenic tank according to any one of claims 1 to 4, characterized in that: a protection chain is connected between the inner cylinder section and the inner manhole cover.
6. The quick-tightening manhole structure of the marine cryogenic tank according to any one of claims 1 to 4, characterized in that: an annular groove is formed in the inner side wall of the bottom of the outer cylinder section, and the inner cylinder section is abutted against the annular groove of the outer cylinder section and welded with the outer cylinder section.
7. The quick-tightening manhole structure of the marine cryogenic tank according to any one of claims 1 to 4, characterized in that: an inner reinforcing ring is welded on the inner sealing head, sleeved on the inner cylinder section and welded with the inner cylinder section, an outer reinforcing ring is welded on the outer sealing head, and the outer reinforcing ring is sleeved on the outer cylinder section and welded with the outer cylinder section.
8. The quick-tightening manhole structure of the marine cryogenic tank according to any one of claims 1 to 4, characterized in that: the driving chain is meshed with the outside cog of the chain wheel on each screw rod, and the cog of the inner side of the chain wheel on the rotating shaft is meshed with the driving chain.
9. The quick-tightening manhole structure of the marine cryogenic tank according to any one of claims 1 to 4, characterized in that: the connection structure between the screw rod and the inner manhole cover is as follows: the inner manhole cover is provided with a bearing hole, the lower section of the screw rod is an optical axis section, a boss is arranged on the optical axis section, two pushing bearings are respectively sleeved on the optical axis sections positioned on the upper side and the lower side of the boss, the two pushing bearings are propped against the hole wall of the bearing hole, the bearing hole is connected with a cover plate, and the cover plate is propped against the pushing bearings positioned on the upper side of the boss.
10. The quick-tightening manhole structure of a marine cryogenic tank of claim 9, wherein: an annular supporting column is welded on the bottom wall of the inner manhole cover in the middle, a plurality of reinforcing ribs are uniformly distributed on the outer side wall of the annular supporting column along the circumference, the reinforcing ribs are welded on the bottom wall of the inner manhole cover, and each reinforcing rib is aligned with each screw rod in the inner quick locking mechanism one by one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321039462.5U CN219955021U (en) | 2023-05-05 | 2023-05-05 | Quick-tightening manhole structure of marine low-temperature storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321039462.5U CN219955021U (en) | 2023-05-05 | 2023-05-05 | Quick-tightening manhole structure of marine low-temperature storage tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219955021U true CN219955021U (en) | 2023-11-03 |
Family
ID=88551100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321039462.5U Active CN219955021U (en) | 2023-05-05 | 2023-05-05 | Quick-tightening manhole structure of marine low-temperature storage tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219955021U (en) |
-
2023
- 2023-05-05 CN CN202321039462.5U patent/CN219955021U/en active Active
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