CN110907108B - Damping test model for liquefied natural gas storage tank - Google Patents

Damping test model for liquefied natural gas storage tank Download PDF

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Publication number
CN110907108B
CN110907108B CN201911224588.8A CN201911224588A CN110907108B CN 110907108 B CN110907108 B CN 110907108B CN 201911224588 A CN201911224588 A CN 201911224588A CN 110907108 B CN110907108 B CN 110907108B
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storage tank
block
tank
wall
damper
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CN110907108A (en
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陈增顺
付军
徐振钢
袁晨峰
陈团海
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Chongqing University
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Chongqing University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M7/00Vibration-testing of structures; Shock-testing of structures
    • G01M7/02Vibration-testing by means of a shake table
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M7/00Vibration-testing of structures; Shock-testing of structures
    • G01M7/02Vibration-testing by means of a shake table
    • G01M7/027Specimen mounting arrangements, e.g. table head adapters

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Abstract

The invention relates to a shock absorption test model of a liquefied natural gas storage tank, which belongs to the technical field of LNG storage tanks and comprises an outer tank, a storage tank and dampers, wherein the storage tank is arranged in the outer tank, powder materials are filled between the storage tank and the outer tank, the dampers are divided into a plurality of groups, each group is annularly distributed between the storage tank and the outer tank, one end of each damper is connected with the inner wall of the outer tank through a first sliding connection structure, and the other end of each damper is connected with the outer wall of the storage tank through a second sliding connection structure. The device can be used for researching the dynamic characteristics of the storage tanks and the difference of seismic response under different damping arrangement modes of the storage tanks, so that the damping effects of different damping device arrangement modes are verified, and scientific verification is provided for theoretical analysis.

Description

Damping test model for liquefied natural gas storage tank
Technical Field
The invention belongs to the technical field of LNG storage tanks, and particularly relates to a damping test model of a liquefied natural gas storage tank.
Background
In densely populated and economically developed areas or cities, if a large destructive earthquake occurs, thousands of people can die in a very short time, countless buildings can be damaged as ruins, huge disasters can be caused to people, the storage tank is used as an extra-large Liquefied Natural Gas (LNG) storage tank of the life line engineering of the contemporary society, the storage tank is very fragile to the earthquake due to the fact that the wall of the storage tank is very thin, the earthquake can not only cause the loss of the using function, but also cause disastrous results due to explosion, fire and environmental pollution, the loss caused by the damage of the storage tank is huge, not only the economic loss of the storage tank is large, and the damage can threaten the life and property of the surroundings very early. At present, the storage tank shock insulation research is mostly carried out by theoretical analysis and numerical simulation from the research mode; the test is less particularly in the aspect of test research of the vibration table.
Therefore, a shock absorption test model of the liquefied natural gas storage tank is urgently needed to be provided, and is used for researching the dynamic characteristics and the seismic response difference of the storage tanks in different shock absorption arrangement modes, so that the shock absorption effects of different shock absorption device arrangement modes are verified, and scientific verification is provided for theoretical analysis.
Disclosure of Invention
In view of this, the application mainly provides a liquefied natural gas storage tank shock attenuation test model, can be used to study the difference of dynamic characteristic and seismic response of each storage tank under different shock attenuation arrangement forms of storage tank to verify the shock attenuation effect of different shock insulation device arrangement modes, provide scientific verification for theoretical analysis.
In order to achieve the purpose, the invention provides the following technical scheme:
the damping test model of the liquefied natural gas storage tank comprises an outer tank, the storage tank and a damper, wherein the storage tank is arranged in the outer tank, powder materials are filled between the storage tank and the outer tank, the damper is divided into a plurality of groups, each group is annularly distributed between the storage tank and the outer tank, one end of the damper is connected with the inner wall of the outer tank through a first sliding connection structure, the other end of the damper is connected with the outer wall of the storage tank through a second sliding connection structure, the first sliding connection structure comprises a first sliding block and a vertical rail, one end of the damper is hinged with the first sliding block, the first sliding block is connected with the vertical rail through a rail so that the first sliding block can slide along the vertical guide rail, the vertical rail is connected with the inner wall of the outer tank in a mode of circumferential movement along the inner wall of the outer tank, the second sliding connection structure comprises a second sliding block and an annular rail, each group of dampers corresponds to an annular track, the other end of each damper is hinged to the second sliding block, the second sliding block is connected with the annular track through a track, so that the second sliding block can slide along the annular track, and the annular track is sleeved on the outer side of the storage tank and is connected with the outer wall of the storage tank in a manner of moving along the axial direction of the storage tank.
Further, the first sliding block comprises a first block body, a first pulley block, a first clamping block, a first screw rod, a first handle and a first spring, one side of the first block body is hinged with the damper, the other side of the first block body is connected with the vertical track through a first pulley block, a first open slot is formed in the width direction of the first block body, one end of the first opening groove is provided with a positioning hole for the first screw to pass through, the first clamping block is arranged in the first opening groove in a sliding manner and is connected with the first screw through threads, the first handle is fixedly arranged at one end of the first screw rod, which is far away from the first open slot, the first spring is sleeved at the outer side of the first screw rod, and the two ends of the first spring are respectively abutted against the first clamping block and the inner wall of the first open slot, by rotating the first screw rod, the side surface of the first clamping block is attached to the side wall of the vertical track to realize tight pushing and fixing when the first clamping block slides along the first open slot.
Further, the second slider comprises a second block body, a second pulley block, a second fixture block, a second screw, a second handle and a second spring, one side of the second block body is hinged to the damper, the other side of the second block body is connected with the circular track through the second pulley block, the other end of the damper is hinged to the second block body, a second open slot is formed in the width direction of the second block body, a positioning hole for the second screw to penetrate through is formed in one end of the second open slot, the second fixture block is arranged in the second open slot in a sliding mode and is in threaded connection with the second screw, the second handle is fixedly arranged at one end, far away from the second open slot, of the second screw, the second spring is sleeved on the outer side of the second screw, two ends of the second spring are respectively abutted to the inner walls of the second fixture block and the second open slot, and the second screw is rotated, and the side surface of the second clamping block is attached to the side wall of the annular track to realize tight jacking and fixing when the second clamping block slides along the second open slot.
Further, the second pulley block is composed of a plurality of second pulleys and a connecting rod, the second pulleys are connected to the second block through the connecting rod, and the second pulleys can move relative to the outer surface of the second block.
Furthermore, an external thread is formed on the connecting rod, a threaded hole is formed in the second block body, and the connecting rod is connected with the threaded hole through a thread.
Further, the inner wall of the outer tank is provided with a ring groove, and one side of the vertical track connected with the outer tank is correspondingly provided with a bulge matched with the ring groove.
Furthermore, the outer wall of the storage tank is provided with external threads, the inner side of the annular track is provided with internal threads, and the annular track is connected with the outer wall of the storage tank through threads.
Further, be provided with the drive on the outer jar drive arrangement that the circular orbit pivoted, drive arrangement includes motor and connecting rod, the motor is fixed to be set up the top outside of outer jar, the output shaft of motor pass the top of outer jar with the connecting rod is connected, the connecting rod with the circular orbit is connected, through motor drive the circular orbit rotates.
Further, the connecting rod includes first montant, horizontal pole, second montant and rotates the handle, the upper end fixed connection of first montant is to the output shaft of motor, the lower extreme fixed connection of first montant is to the horizontal pole, a logical groove has been seted up on the horizontal pole, the upper end of second montant slides and sets up it is fixed through a mounting to lead to the inslot, the lower extreme of second montant passes through rotate handle fixed connection to circular orbit.
The invention has the beneficial effects that: the invention relates to a damping test model of a liquefied natural gas storage tank, wherein powder materials are filled between the storage tank and an outer tank, a plurality of groups of dampers are arranged, each group is annularly distributed between the storage tank and the outer tank, the underground environment of the natural gas storage tank can be simulated more truly, one end of each damper is connected with the inner wall of the outer tank through a first sliding connection structure, the other end of each damper is connected with the outer wall of the storage tank through a second sliding connection structure, the position of most point connection on the inner wall of the outer tank can be regulated and simulated by one end of each damper through the first sliding connection structure, the position of any point on the outer wall of the storage tank can be regulated and simulated by the other end of each damper through the second sliding connection structure, so that dampers with different numbers and arrangement forms are selected according to obtain the differences of the dynamic characteristics and the seismic response of the storage tanks in the arrangement forms, therefore, the shock absorption effects of different shock absorption device arrangement modes are verified, and scientific verification is provided for theoretical analysis.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of FIG. 1 at A-A;
FIG. 3 is an enlarged view of FIG. 1 at B-B;
FIG. 4 is a schematic structural diagram of a first slider;
FIG. 5 is a left side view of FIG. 4;
FIG. 6 is a bottom view of FIG. 5;
FIG. 7 is a schematic structural diagram of a second slider;
FIG. 8 is a top view of FIG. 7;
fig. 9 is a schematic view of the connection of the connecting rod of the present invention.
The reference numerals include an outer tank 1, a storage tank 2, a damper 3, a powder material 4, a first sliding connection structure 5, a first slider 51, a vertical rail 52, a second sliding connection structure 6, a second slider 61, an annular rail 62, a first block 511, a first pulley block 512, a first fixture block 513, a first screw 514, a first handle 515, a first spring 516, a first open slot 517, a second block 611, a second pulley block 612, a second fixture block 613, a second screw 614, a second handle 615, a second spring 616, a second open slot 617, a connecting rod 618, a ring slot 7, a protrusion 8, a motor 9, a first vertical rod 10, a cross rod 11, a second vertical rod 12, a rotating handle 13, a through slot 14 and a fixing member 15.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Fig. 1 is a schematic structural view of the present invention, fig. 2 is an enlarged view of fig. 1 at a-a, fig. 3 is an enlarged view of fig. 1 at B-B, fig. 4 is a schematic structural view of a first slider, fig. 5 is a left side view of fig. 4, fig. 6 is a bottom view of fig. 5, fig. 7 is a schematic structural view of a second slider, fig. 8 is a top view of fig. 7, and fig. 9 is a schematic connection diagram of a link according to the present invention. The invention relates to a shock absorption test model of a liquefied natural gas storage tank, which comprises an outer tank 1, a storage tank 2 and dampers 3, wherein the storage tank 2 is arranged in the outer tank 1, powder materials 4 are filled between the storage tank 2 and the outer tank 1, the dampers 3 are divided into a plurality of groups, each group is annularly distributed between the storage tank 2 and the outer tank 1, one end of each damper 3 is connected with the inner wall of the outer tank 1 through a first sliding connection structure 5, the other end of each damper 3 is connected with the outer wall of the storage tank 2 through a second sliding connection structure 6, each first sliding connection structure 5 comprises a first sliding block 51 and a vertical rail 52, one end of each damper 3 is hinged with the first sliding block 51, the first sliding block 51 is connected with the vertical rail 52 through a rail so that the first sliding block 51 can slide along the vertical rail, the vertical rail 52 is connected with the inner wall of the outer tank 1 in a manner of moving along the circumferential direction of the inner wall of the outer tank 1, the second sliding connection structure 6 comprises a second sliding block 61 and an annular rail 62, each group of dampers 3 corresponds to one annular rail 62, the other ends of the dampers 3 are hinged to the second sliding block 61, the second sliding block 61 and the annular rail 62 are connected through rails so that the second sliding block 61 can slide along the annular rail 62, and the annular rail 62 is sleeved on the outer side of the storage tank 2 and is connected with the outer wall of the storage tank 2 in a manner of being capable of moving along the axial direction of the storage tank 2.
According to the device, the whole scale of the outer tank 1 is larger than that of the storage tank 2, the outer tank 1 can be made of reinforced concrete materials, the storage tank 2 can be made of steel structural materials, and the damper 3 can be made of a viscous damper. According to the invention, the storage tank 2 is directly arranged in the outer tank 1 and is arranged at the bottom of the outer tank 1, the upper end of the storage tank 2 is opened, liquid for simulating liquefied natural gas is filled in the storage tank 2, the powder material 4 is filled between the storage tank 2 and the outer tank 1, the stacking height of the powder material 4 is approximately flush with the upper end opening of the storage tank 2, the powder material 4 is made of perlite, the sensor can be installed as required, and the specific test position, the connection method and the like belong to the prior art, and are not described herein again. The damper 3 is a plurality of groups, each group is annularly distributed between the storage tank 2 and the outer tank 1, the environment of the natural gas storage tank 2 underground can be simulated more truly, one end of the damper 3 is connected with the inner wall of the outer tank 1 through the first sliding connection structure 5, the other end of the damper 3 is connected with the outer wall of the storage tank 2 through the second sliding connection structure 6, because each group of the damper 3 is annularly distributed, the first sliding connection structure 5 and the second sliding connection structure 6 are also adaptively annularly distributed, the number of the dampers can be adjusted according to requirements, the position of the damper 3 connected with most points on the inner wall of the outer tank 1 can be adjusted and simulated by one end of the damper 3 through the first sliding connection structure 5, the position of any point on the outer wall of the storage tank 2 can be adjusted and simulated by the other end of the damper 3 through the second sliding connection structure 6, therefore, different numbers and arrangement forms of the dampers 3 are selected according to needs, and the differences of the dynamic characteristics and the seismic response of the storage tanks 2 in the arrangement forms are obtained, so that the shock absorption effects of different arrangement forms of the shock insulation devices are verified, and scientific verification is provided for theoretical analysis.
In this embodiment, the first slider 51 includes a first block 511, a first pulley block 512, a first fixture block 513, a first screw 514, a first handle 515 and a first spring 516, the length direction of the first block 511 is vertical, the radian of the first block 511 is adapted to the radian of the inner wall of the outer tank 1, one side of the first block 511 is hinged to the damper 3, the other side of the first block 511 is connected to the vertical rail 52 through the first pulley block 512, a first open slot 517 is formed along the width direction of the first block 511, one end of the first open slot 517 is provided with a positioning hole for the first screw 514 to pass through, the first fixture block 513 is slidably disposed in the first open slot 517 and is connected to the first screw 514 through a thread, the first handle 515 is fixedly disposed at one end of the first screw 514, which is far away from the first open slot 517, the first spring 516 is disposed outside the first screw 514, and two ends of the first spring 516 are respectively connected to the first fixture block 513 and the first open slot 517 The inner wall is abutted, and by rotating the first screw 514, the side surface of the first fixture block 513 is attached to the side wall of the vertical rail 52 to realize jacking and fixing when sliding along the first opening groove 517.
In this embodiment, the second slider 61 includes a second block 611, a second pulley block 612, a second block 613, a second screw 614, a second handle 615 and a second spring 616, one side of the second block 611 is hinged to the damper 3, an arc of the second block 611 is adapted to an arc of an outer wall of the storage tank 2, the other side of the second block 611 is connected to the circular rail 62 through the second pulley block 612, the other end of the damper 3 is hinged to the second block 611, a second opening groove 617 is formed along a width direction of the second block 611, one end of the second opening groove 617 is provided with a positioning hole for the second screw 614 to pass through, the second block 613 is slidably disposed in the second opening groove 617 and is connected to the second screw 614 through a screw, the second handle 615 is fixedly disposed at an end of the second screw 614 far from the second opening groove 617, the second spring 616 is sleeved outside the second screw 614, two ends of the second spring abut against inner walls of the second clamping block 613 and the second opening groove 617 respectively, and by rotating the second screw 614, a side surface of the second clamping block 613 is attached to a side wall of the annular rail 62 to be tightly supported and fixed when sliding along the second opening groove 617.
In this embodiment, the second pulley set 612 is composed of a plurality of second pulleys and connecting rods 618, the second pulleys are connected to the second block 611 through the connecting rods 618 and are movable relative to the outer surface of the second block 611, so that the specific position between each second pulley and the second body is adjusted to a certain extent, and the arrangement of each second pulley in the second pulley set 612 is in an arc shape adapted to the outer wall of the storage tank 2, so that the matching degree is better. The connecting rod 618 is provided with an external thread, the second block 611 is provided with a threaded hole, and the connecting rod 618 is in threaded connection with the threaded hole. By rotating the connecting rod 618, the second pulley can move relative to the outer surface of the second block 611, and the connection can be detached, so that the damaged pulley can be replaced in time.
In this embodiment, annular 7 has been seted up on the inner wall of outer jar 1, vertical track 52 is connected one side with outer jar 1 and is corresponded be provided with annular 7 complex arch 8, this embodiment annular 7 is T type groove, sets up to three groups, can increase stability, when playing sliding connection, plays a fixed connection's effect to vertical track 52.
In this embodiment, the outer wall of the storage tank 2 is provided with an external thread, the inner side of the annular rail 62 is provided with an internal thread, and the annular rail 62 is connected with the outer wall of the storage tank 2 through a thread. The annular rail 62 is engaged with the tank 2 by means of a screw connection and can be rotated relative to the tank 2, so that the annular rail 62 moves up and down relative to the tank 2, and the height of the annular rail 62 can be changed by a continuous displacement.
In this embodiment, be provided with the drive on outer jar 1 annular rail 62 pivoted drive arrangement, drive arrangement includes motor 9 and connecting rod, motor 9 is fixed to be set up the top outside of outer jar 1, the output shaft of motor 9 pass outer jar 1 the top with the connecting rod is connected, the connecting rod with annular rail 62 is connected, through the drive of motor 9 annular rail 62 rotates, has realized the automatic drive rotation, has saved the manpower.
In this embodiment, the connecting rod includes first montant 10, horizontal pole 11, second montant 12 and rotation handle 13, the upper end fixed connection of first montant 10 is to the output shaft of motor 9, the lower extreme fixed connection of first montant 10 is to horizontal pole 11, a logical groove 14 has been seted up on the horizontal pole 11, the upper end of second montant 12 slides and sets up lead to the inslot 14 and fixed through a mounting 15, the lower extreme of second montant 12 passes through rotation handle 13 fixed connection is to circular orbit 62.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (8)

1. Liquefied natural gas storage tank shock attenuation test model, its characterized in that: the device comprises an outer tank, a storage tank and dampers, wherein the storage tank is arranged in the outer tank, powder materials are filled between the storage tank and the outer tank, the dampers are a plurality of groups, each group is annularly distributed between the storage tank and the outer tank, one end of each damper is connected with the inner wall of the outer tank through a first sliding connection structure, the other end of each damper is connected with the outer wall of the storage tank through a second sliding connection structure, each first sliding connection structure comprises a first sliding block and a vertical rail, one end of each damper is hinged with the corresponding first sliding block, the first sliding block is connected with the corresponding vertical rail through a rail so that the first sliding block can slide along the corresponding vertical guide rail, the vertical rail is connected with the inner wall of the outer tank in a manner of circumferential movement along the inner wall of the outer tank, each second sliding connection structure comprises a second sliding block and an annular rail, and each group of dampers corresponds to one annular rail, the other end of the damper is hinged to the second sliding block, the second sliding block is connected with the annular track through a track, so that the second sliding block can slide along the annular track, and the annular track is sleeved on the outer side of the storage tank and is connected with the outer wall of the storage tank in a manner of moving along the axial direction of the storage tank; the first sliding block comprises a first block body, a first pulley block, a first clamping block, a first screw rod, a first handle and a first spring, one side of the first block body is hinged with the damper, the other side of the first block body is connected with the vertical track through a first pulley block, a first open slot is formed in the width direction of the first block body, one end of the first opening groove is provided with a positioning hole for the first screw to pass through, the first clamping block is arranged in the first opening groove in a sliding manner and is connected with the first screw through threads, the first handle is fixedly arranged at one end of the first screw rod, which is far away from the first open slot, the first spring is sleeved at the outer side of the first screw rod, and the two ends of the first spring are respectively abutted against the first clamping block and the inner wall of the first open slot, by rotating the first screw rod, the side surface of the first clamping block is attached to the side wall of the vertical track to realize tight pushing and fixing when the first clamping block slides along the first open slot.
2. The liquefied natural gas storage tank shock absorption test model according to claim 1, wherein: the second slider comprises a second block body, a second pulley block, a second clamping block, a second screw rod, a second handle and a second spring, one side of the second block body is hinged to the damper, the other side of the second block body is connected with the circular track through the second pulley block, the other end of the damper is hinged to the second block body, a second open slot is formed in the width direction of the second block body, a positioning hole for the second screw rod to penetrate is formed in one end of the second open slot, the second clamping block is arranged in the second open slot in a sliding mode and is connected with the second screw rod through threads, the second handle is fixedly arranged at one end, far away from the second open slot, of the second screw rod, the second spring is arranged on the outer side of the second screw rod in a sleeved mode, two ends of the second spring are respectively abutted to the inner walls of the second clamping block and the second open slot, and the second screw rod is rotated, and the side surface of the second clamping block is attached to the side wall of the annular track to realize tight jacking and fixing when the second clamping block slides along the second open slot.
3. The liquefied natural gas storage tank shock absorption test model according to claim 2, wherein: the second pulley block is composed of a plurality of second pulleys and a connecting rod, the second pulleys are connected to the second block body through the connecting rod, and the second pulleys can move relative to the outer surface of the second block body.
4. The liquefied natural gas storage tank shock absorption test model according to claim 3, wherein: the connecting rod is provided with an external thread, the second block body is provided with a threaded hole, and the connecting rod is in threaded connection with the threaded hole.
5. The liquefied natural gas storage tank shock absorption test model according to any one of claims 1 to 4, wherein: the inner wall of the outer tank is provided with a ring groove, and one side of the vertical track, which is connected with the outer tank, is correspondingly provided with a bulge matched with the ring groove.
6. The liquefied natural gas storage tank shock absorption test model according to any one of claims 1 to 4, wherein: the outer wall of the storage tank is provided with external threads, the inner side of the annular track is provided with internal threads, and the annular track is connected with the outer wall of the storage tank through threads.
7. The liquefied natural gas storage tank shock absorption test model according to claim 6, wherein: the outer tank is provided with a driving device for driving the annular rail to rotate, the driving device comprises a motor and a connecting rod, the motor is fixedly arranged on the outer side of the top of the outer tank, an output shaft of the motor penetrates through the top of the outer tank to be connected with the connecting rod, the connecting rod is connected with the annular rail, and the annular rail rotates under the driving of the motor.
8. The liquefied natural gas storage tank shock absorption test model according to claim 7, wherein: the connecting rod includes first montant, horizontal pole, second montant and rotates the handle, the upper end fixed connection of first montant is to the output shaft of motor, the lower extreme fixed connection of first montant is to the horizontal pole, a logical groove has been seted up on the horizontal pole, the upper end of second montant slides and sets up it is fixed through a mounting to lead to the inslot, the lower extreme of second montant passes through rotate handle fixed connection to endless track.
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