A large storage tank ceiling and method thereof

Abstract

The application discloses a large storage tank ceiling and a method thereof, and belongs to the technical field of low-temperature storage tanks. The ceiling comprises an outer top, an inner top and a self-adapting suspender installed between the outer top and the inner top. The self-adapting suspender comprises an upper fixed rod, an adjustable length section, a temperature insulation block, a self-adapting temperature control telescopic section and a lower fixed rod connected in sequence from top to bottom. In this way, the radial rib beam and the circumferential rib beam form a support frame, and the circumferential rib beam is connected with the outer top to provide support for the inner top. When low-temperature medium is injected into the tank body, the inner top is cooled and shrinks as a whole to deform. The temperature in the storage tank is transmitted to the self-adapting temperature control telescopic section along the lower connecting section and is blocked by the temperature insulation block. The self-adapting temperature control telescopic section is cooled and extended, so that the length of the whole self-adapting suspender is extended. When the low-temperature medium in the storage tank is discharged, the temperature gradually rises, and the self-adapting temperature control telescopic section is heated and shrinks, so that the self-adapting suspender always adapts to the deformation of the inner top, and fatigue fracture of the self-adapting suspender is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-temperature storage tanks, in particular to a large storage tank ceiling and a method thereof. BACKGROUND

[0002] A large storage tank ceiling is disclosed in Chinese patent CN104533003A, which comprises a net rack built by profiled materials with certain shapes, a plurality of corrugated boards connected together by splicing and laid above the net rack, and a hanger rod connected with the net rack at one end and used for hoisting the ceiling above the storage tank. The ceiling does not need welding of parts, has light weight and reduces the load of the tank top net shell. However, the ceiling still has the following problems:

[0003] 1. After the storage tank body stores low-temperature medium, the inner top is prone to cold shrinkage, which forms a downward pulling force on the hanger rod, easily causing fatigue of the hanger lug connected with the end of the hanger rod, and the temperature of the inner top is transmitted upward along the hanger rod, forming a cold bridge of the hanger rod, which easily deteriorates the side of the hanger rod connected with the outer top.

[0004] 2. The ceiling needs to be regularly maintained and inspected to observe whether there are phenomena such as corrosion, deformation and cracks. The circumferential rib beam is used to connect with the lower end of the hanger rod to bear the weight of the entire inner top. The accuracy of visual observation to determine whether it is abnormal is low and inconvenient.

[0005] 3. When the workpiece is detected by an ultrasonic probe, a coupling medium needs to be applied between the probe and the workpiece to be detected to enable the ultrasonic wave to smoothly transmit into the workpiece to be detected. Common coupling media include water and oil. The viscosity of water is low, a small amount of water cannot fill the unevenness on the surface of the workpiece to be detected, and a large amount of water needs to be frequently replenished. If oil medium is used, the surface of the workpiece to be detected will be polluted, and the workpiece to be detected will easily adsorb dust and be dirty.

[0006] Therefore, the present application designs a large storage tank ceiling and a method thereof to solve the above problems. SUMMARY

[0007] In view of the above-mentioned shortcomings of the prior art, the present application provides a large storage tank ceiling and a method thereof.

[0008] To achieve the above purpose, the present application realizes the following technical scheme:

[0009] A large storage tank ceiling comprises an outer top, an inner top and a self-adaptive hanger rod installed between the outer top and the inner top.

[0010] The inner roof comprises a center plate, a support frame and a layer plate, the support frame comprises a plurality of circumferential rib beams distributed outward from the center part of the center plate and a plurality of radial rib beams distributed radially, the end of the radial rib beam is fixedly connected with the center plate, the radial rib beam and the circumferential rib beam are fixedly connected, and the layer plate is laid along the center plate radially between adjacent radial rib beams;

[0011] The circumferential rib beam and the outer roof are uniformly welded with a plurality of corresponding lifting lugs at equal intervals, the self-adaptive lifting rod comprises an upper fixed rod, an adjustable length section, a temperature insulation block, a self-adaptive temperature control telescopic section and a lower fixed rod connected in sequence from top to bottom, the upper fixed rod is connected with the lifting lug of the outer roof through a lifting ring, the lower fixed rod is connected with the lifting lug on the circumferential rib beam through a lifting ring, the temperature in the storage tank is transmitted to the self-adaptive temperature control telescopic section along the lower connecting section and is blocked by the temperature insulation block, the self-adaptive temperature control telescopic section extends when cooling and contracts when heating.

[0012] The layer plate is also provided with a self-propelled ultrasonic detection mechanism for moving along the circumferential rib beam.

[0013] Further, the self-adaptive temperature control telescopic section comprises a piston rod, a piston head and a temperature control adjusting block, the upper end of the piston rod is fixedly connected with the temperature insulation block, the lower end of the piston rod is fixedly connected with the piston head, the lower end of the temperature control adjusting block is fixedly connected with the lower fixed rod, the upper end of the temperature control adjusting block is provided with a piston cavity, an expanded gas is arranged in the piston cavity, the piston head is limitingly and slidably connected with the piston cavity, and the piston rod is clearance-fitted with the upper end of the piston cavity to realize the sealing effect of the piston cavity.

[0014] Further, the self-propelled ultrasonic detection mechanism comprises a moving carrier, a vertical moving assembly, a moving detection limiting assembly and a contact type ultrasonic detection mechanism, a monitoring probe for observing the surrounding environment is fixedly installed on the top of the moving carrier; the vertical moving assembly is installed on the side of the moving carrier, the moving detection limiting assembly and the contact type ultrasonic detection mechanism are installed on the moving end of the vertical moving assembly, the moving detection limiting assembly is used for enabling the moving carrier to move stably along the circumferential rib beam, and the contact type ultrasonic detection mechanism is used for being in close contact with the circumferential rib beam and performing ultrasonic detection; an obstacle crossing assembly for assisting the moving carrier to cross the circumferential rib beam is installed on the side of the moving carrier.

[0015] Further, the moving detection limiting assembly comprises a fixed limiting assembly, a movable limiting assembly and a first pushing member, the fixed limiting assembly is fixedly connected with the moving end of the vertical moving assembly, the first pushing member is installed on the fixed limiting assembly, and the output end of the first pushing member is fixedly connected with the movable limiting assembly.

[0016] Further, the contact type ultrasonic detection mechanism comprises a support frame, a close coupling mechanism and an ultrasonic detection assembly installed on the support frame, the support frame is fixedly connected with the moving end of the vertical moving assembly, and the close coupling mechanism is located between the ultrasonic detection assembly and the circumferential rib beam.

[0017] Further, the close-coupling mechanism comprises a support roller, a guide roller, a medium layer and a water spraying assembly, the support roller is provided with two and is rotationally connected with the support frame, the guide roller is provided with two and is also rotationally connected with the support frame, the medium layer is arranged around the outside of the support roller and between the support roller and the guide roller, so that the support roller and the guide roller are drivingly connected; the medium layer between the two support rollers constitutes a first contact layer, the medium layer between the two guide rollers constitutes a second contact layer, and the first contact layer and the second contact layer are arranged in parallel.

[0018] Further, the ultrasonic detection assembly comprises a second pushing member, a connecting plate and ultrasonic probes, the second pushing member is fixedly connected with the support frame, the output end of the second pushing member is fixedly installed with the connecting plate, and the connecting plate is fixedly installed with a plurality of ultrasonic probes.

[0019] Further, the water spraying assembly comprises a liquid storage tank and a liquid spraying pipe, the liquid storage tank is fixedly installed on the mobile carrier, one end of the liquid spraying pipe is fixedly connected with the liquid storage tank, the other end of the liquid spraying pipe is fixedly connected with the support frame, and the water outlet end of the support frame is fixedly installed with a nozzle facing the medium layer.

[0020] Further, the support frame is also installed with a blowing and dust cleaning mechanism for cleaning dust on the to-be-detected part before ultrasonic detection.

[0021] In order to better achieve the purpose of the present application, the present application also provides a self-checking method for a large storage tank ceiling, comprising the following steps:

[0022] Step one: the mobile carrier moves to the side of the circumferential rib beam;

[0023] Step two: the vertical moving assembly controls the moving detection limiting assembly and the contact type ultrasonic detection mechanism to move downward, the mobile carrier moves to make the fixed limiting assembly fit the circumferential rib beam, then the first pushing member drives the movable limiting assembly to retract, so that the fixed limiting assembly and the movable limiting assembly cooperate to clamp and limit the circumferential rib beam;

[0024] Step three: the mobile carrier can move along the circumferential rib beam;

[0025] Step four: the blowing and dust cleaning mechanism blows air to the circumferential rib beam to blow away the dust on the side of the circumferential rib beam or the ear, the medium layer fits the side of the circumferential rib beam, and under the action of friction, the medium layer rotates around the support roller and the guide roller, and the liquid spraying pipe continuously sprays water to the medium layer;

[0026] Step five: the second pushing member pushes the ultrasonic probes towards the medium layer, so that the ultrasonic probes press the medium layer against the to-be-detected part, and the circumferential rib beam and the ear are subjected to ultrasonic detection;

[0027] Step six: the mobile carrier, the vertical moving assembly and the first pushing piece cooperate to avoid the adaptive boom;

[0028] Step seven: repeat steps two to six until the ultrasonic detection work on a whole circumferential rib beam is completed.

[0029] Compared with the prior art, the present application has the following beneficial effects: 1. The radial rib beam and the circumferential rib beam constitute a support frame, and the circumferential rib beam provides support for the inner top by connecting with the outer top. When low-temperature medium is injected into the tank body, the inner top cools down and shrinks as a whole, and the temperature in the tank body is transmitted to the adaptive temperature control expansion section along the lower connecting section and is blocked by the temperature insulation block. The adaptive temperature control expansion section cools down and extends, so that the length of the whole adaptive boom is extended. When the low-temperature medium in the tank is discharged, the temperature gradually rises, and the adaptive temperature control expansion section shrinks as the temperature rises, so that the adaptive boom always adapts to the deformation of the inner top, ensuring that the adaptive boom is uniformly stressed and avoiding fatigue fracture of the adaptive boom. At the same time, the cold bridge is disconnected by the temperature insulation block, avoiding the transmission of temperature.

[0030] 2. The fixed limiting wheel and the movable limiting wheel cooperate to clamp and limit the circumferential rib beam, so that the mobile carrier can move stably along the circumferential rib beam.

[0031] During the movement of the mobile carrier, the air blowing head blows air to the circumferential rib beam to blow away the dust on the side surface of the circumferential rib beam or the lug surface. The medium layer is attached to the side surface of the circumferential rib beam, and rotates under the action of friction force. The second pushing piece pushes the ultrasonic probe towards the medium layer, so that the ultrasonic probe abuts against the medium layer at the detection position, and the water spraying pipe continuously sprays water to the medium layer, so that the medium layer is soaked with water. The water consumption is small, and the ultrasonic probe and the detection position have high coupling effect. Even the uneven weld can be stably removed by the ultrasonic probe, ensuring the accuracy of the detection result. After the ultrasonic probe detects the connection position of the adaptive boom and the circumferential rib beam, the mobile carrier, the vertical moving assembly and the first pushing piece cooperate to avoid the adaptive boom, and the next circumferential rib beam is detected. The above operation is repeated until the detection work on a whole circumferential rib beam is completed. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0033] Figure 1 It is a structural schematic view of a large tank roof of the present application;

[0034] Figure 2 Structure diagram of inner roof of the application;

[0035] Figure 3 Structure diagram of adaptive boom of the application;

[0036] Figure 4 Front half sectional view of adaptive boom of the application;

[0037] Figure 5 Three-dimensional view of self-propelled ultrasonic detection mechanism of the application Figure 1 ;

[0038] Figure 6 Three-dimensional view of self-propelled ultrasonic detection mechanism of the application Figure 2 ;

[0039] Figure 7 Three-dimensional view of mobile detection limiting assembly of the application;

[0040] Figure 8 Three-dimensional view of contact ultrasonic detection mechanism of the application Figure 1 ;

[0041] Figure 9 Three-dimensional view of contact ultrasonic detection mechanism of the application Figure 2 .

[0042] The reference signs in the figures represent respectively:

[0043] 1, outer roof; 2, inner roof; 21, center plate; 22, radial rib beam; 23, circumferential rib beam; 24, layer plate; 3, adaptive boom; 31, upper fixed rod; 32, length-adjusting screw rod; 33, length-adjusting cylinder; 34, temperature insulation block; 35, piston rod; 36, piston head; 37, temperature control adjusting block; 38, piston cavity; 39, lower fixed rod; 4, self-propelled ultrasonic detection mechanism; 41, mobile carrier; 42, liquid storage tank; 43, liquid spraying pipe; 44, fan; 45, blowing head; 46, obstacle crossing assembly; 461, pushing rod; 462, pushing block; 47, vertical moving assembly; 48, mobile detection limiting assembly; 481, first pushing member; 482, fixed bracket; 483, fixed limiting wheel; 484, movable bracket; 485, movable limiting wheel; 49, contact ultrasonic detection mechanism; 491, support frame; 492, second pushing member; 493, connecting plate; 494, ultrasonic probe; 495, support roller; 496, guide roller; 497, medium layer. DETAILED DESCRIPTION

[0044] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0045] In the following description, "left", "right", "front", "back", "upper", "lower" are oriented in the perspective of the front view.

[0046] Embodiment one: in some embodiments, referring to the drawings of the specification Figures 1-4 A large storage tank ceiling, comprising an outer roof 1, an inner roof 2 and an adaptive boom 3 installed between the outer roof 1 and the inner roof 2;

[0047] The inner roof 2 comprises a center plate 21, a support frame and a layer plate 24, the support frame comprises a plurality of circumferential rib beams 23 distributed outwardly from the center part of the center plate 21 and a plurality of radial rib beams 22 distributed radially, the end of the radial rib beam 22 is fixedly connected with the center plate 21, the radial rib beam 22 and the circumferential rib beam 23 are fixedly connected by welding, the layer plate 24 is laid along the center plate 21 radially between adjacent radial rib beams 22, the layer plate 24 can be made of steel plate, corrugated plate, etc., the layer plate 24 is connected or fixedly connected with the radial rib beam 22 by bolts or the like fasteners; the inner roof 2 can be a dome or a flat roof;

[0048] The circumferential rib beam 23 and the outer roof 1 are uniformly welded with a plurality of corresponding lifting lugs at equal intervals, the adaptive boom 3 comprises an upper fixed rod 31, an adjustable length section, a temperature insulation block 34, an adaptive temperature control telescopic section and a lower fixed rod 39 connected in turn from top to bottom, the upper fixed rod 31 is connected with the lifting lug of the outer roof 1 through a lifting ring, the lower fixed rod 39 is connected with the lifting lug on the circumferential rib beam 23 through a lifting ring, the temperature in the storage tank is transmitted to the adaptive temperature control telescopic section along the lower connecting section and is blocked by the temperature insulation block 34, the adaptive temperature control telescopic section extends when cooling and contracts when heating;

[0049] The layer plate 24 is also provided with a self-propelled ultrasonic detection mechanism 4 for moving along the circumferential rib beam 23.

[0050] In the present application, the radial rib beam 22 and the circumferential rib beam 23 constitute a support frame, and the circumferential rib beam 23 is connected with the outer top 1 to provide support for the inner top. When the low-temperature medium is injected into the tank body, the inner top 2 is cooled and deformed as a whole, the temperature in the tank is transmitted to the adaptive temperature control expansion section along the lower connecting section and is blocked by the temperature insulation block 34, the adaptive temperature control expansion section is cooled and extended, so that the length of the whole adaptive boom 3 is extended. When the low-temperature medium in the tank is discharged, the temperature gradually rises, and the adaptive temperature control expansion section is heated and shrinks, so that the adaptive boom 3 always adapts to the deformation of the inner top 2, ensures that the adaptive boom 3 is uniformly stressed, avoids fatigue fracture of the adaptive boom 3, and at the same time breaks the cold bridge through the temperature insulation block 34 to avoid the transmission of temperature;

[0051] The length adjusting section includes a length adjusting screw 32 and a length adjusting cylinder 33, the length adjusting screw 32 is fixedly connected with the upper fixed rod 31, the length adjusting cylinder 33 is fixedly connected with the temperature insulation block 34, the length adjusting screw 32 is threadedly connected with the inner side of the length adjusting cylinder 33, and a locking nut is further arranged on the length adjusting screw 32 to avoid loosening of the length adjusting screw 32 and the length adjusting cylinder 33.

[0052] The temperature insulation block 34 can be made of a broken bridge aluminum profile integrated composite metal material to meet high strength and high thermal insulation.

[0053] The adaptive temperature control expansion section includes a piston rod 35, a piston head 36 and a temperature control adjusting block 37, the upper end of the piston rod 35 is fixedly connected with the temperature insulation block 34, the lower end of the piston rod 35 is fixedly connected with the piston head 36, the lower end of the temperature control adjusting block 37 is fixedly connected with the lower fixed rod 39, the upper end of the temperature control adjusting block 37 is provided with a piston cavity 38, a gas with high thermal expansion coefficient, such as ammonia, is arranged in the piston cavity 38, the piston head 36 is limitingly and slidably connected with the piston cavity 38, and the piston rod 35 is gapedly connected with the upper end of the piston cavity 38 to realize the sealing effect of the piston cavity 38.

[0054] Please refer to Figures 5-9 , the self-propelled ultrasonic detection mechanism 4 includes a mobile carrier 41, a vertical moving assembly 47, a moving detection limiting assembly 48 and a contact type ultrasonic detection mechanism 49, the mobile carrier 41 adopts mature technology in the field, is built-in with a battery module and has a steering function; a monitoring probe for observing the surrounding environment is fixedly installed on the top of the mobile carrier 41; the vertical moving assembly 47 is installed on the side of the mobile carrier 41, and the vertical moving assembly 47 can adopt a linear module or a pneumatic sliding table; the moving detection limiting assembly 48 and the contact type ultrasonic detection mechanism 49 are installed on the moving end of the vertical moving assembly 47, the moving detection limiting assembly 48 is used for stably moving the mobile carrier 41 along the circumferential rib beam 23, and the contact type ultrasonic detection mechanism 49 is used for being in close contact with the circumferential rib beam 23 and performing ultrasonic detection;

[0055] The self-propelled ultrasonic detection mechanism 4 can be provided with several, for respectively detecting different circumferential rib beams 23;

[0056] In some embodiments, the self-propelled ultrasonic detection mechanism 4 is provided with only one, and the side of the mobile carrier 41 is provided with an obstacle crossing assembly 46 for assisting the mobile carrier 41 to cross the circumferential rib beam 23, thereby detecting different circumferential rib beams 23 by ultrasonic waves;

[0057] The obstacle crossing assembly 46 is provided with two groups and symmetrically distributed on the left and right sides of the mobile carrier 41, each group of obstacle crossing assemblies 46 includes a poking rod 461 symmetrically rotatably installed on the front and rear sides of the mobile carrier 41, a rotary drive is installed in the mobile carrier 41, the output end of the rotary drive is fixedly connected with one end of the poking rod 461, the other end of the poking rod 461 is fixedly installed with a poking block 462, and the poking block 462 is made of rubber material with large friction; the rotary drive can be a rotary cylinder or a motor; when the mobile carrier 41 moves to the side of the circumferential rib beam 23, the mobile carrier 41 on one side can be lifted by driving rotation, and the mobile carrier 41 can cross the circumferential rib beam 23 by wheels, and then the other side of the mobile carrier 41 can be lifted alternately, thereby realizing the crossing operation of the mobile carrier 41 to the circumferential rib beam 23.

[0058] The movement detection limiting assembly 48 includes a fixed limiting assembly, a movable limiting assembly and a first pushing member 481, the fixed limiting assembly is fixedly connected with the moving end of the vertical movement assembly 47, the first pushing member 481 is installed on the fixed limiting assembly, the output end of the first pushing member 481 is fixedly connected with the movable limiting assembly, and the first pushing member 481 can be a double-shaft air cylinder;

[0059] The fixed limiting assembly includes a fixed bracket 482 and a fixed limiting wheel 483, and the movable limiting assembly includes a movable bracket 484 and a movable limiting wheel 485, the fixed bracket 482 is fixedly connected with the moving end of the vertical movement assembly 47, the fixed limiting wheel 483 is rotatably installed on the fixed bracket 482 through a bearing, the first pushing member 481 is fixedly installed on the upper end of the fixed bracket 482, the output end of the first pushing member 481 is fixedly connected with the movable bracket 484, and the movable limiting wheel 485 is rotatably installed on the movable bracket 484 through a bearing;

[0060] The contact ultrasonic detection mechanism 49 includes a support frame 491, a tight coupling mechanism and an ultrasonic detection assembly installed on the support frame 491, the support frame 491 is fixedly connected with the moving end of the vertical movement assembly 47, and the tight coupling mechanism is located between the ultrasonic detection assembly and the circumferential rib beam 23;

[0061] The close-coupling mechanism comprises support rollers 495, guide rollers 496, a medium layer 497 and a water spraying assembly, the support rollers 495 are provided with two and are rotationally connected with the support frame 491, the guide rollers 496 are provided with two and are also rotationally connected with the support frame 491, the medium layer 497 is arranged around the outer side of the support rollers 495 and between the support rollers 495 and the guide rollers 496, so that the support rollers 495 and the guide rollers 496 are drivingly connected; the medium layer 497 between the two support rollers 495 constitutes a first contact layer, the medium layer 497 between the two guide rollers 496 constitutes a second contact layer, the first contact layer and the second contact layer are arranged in parallel, and there is a certain gap between the two; the gap can be set to five millimeters.

[0062] The medium layer 497 can adopt cotton cloth, gauze and the like, has good water absorption and a compact structure.

[0063] The ultrasonic detection assembly comprises a second pushing member 492, a connecting plate 493 and ultrasonic probes 494, the second pushing member 492 is fixedly connected with the support frame 491, the second pushing member 492 can adopt a double-shaft air cylinder, the output end of the second pushing member 492 is fixedly installed with the connecting plate 493, and the connecting plate 493 is fixedly installed with a plurality of ultrasonic probes 494;

[0064] The water spraying assembly comprises a liquid storage tank 42 and a liquid spraying pipe 43, the liquid storage tank 42 is fixedly installed on the mobile carrier 41, one end of the liquid spraying pipe 43 is fixedly connected with the liquid storage tank 42, the other end of the liquid spraying pipe 43 is fixedly connected with the support frame 491, and the water outlet end of the support frame 491 is fixedly installed with a spray head facing the medium layer 497; a pump body is installed in the liquid storage tank 42, for pumping water in the liquid storage tank 42 out of the liquid spraying pipe 43;

[0065] The support frame 491 is further installed with a blowing and dust cleaning mechanism, for cleaning dust at a detection position before ultrasonic detection.

[0066] The blowing and dust cleaning mechanism comprises a fan 44 and a blowing head 45, the fan 44 is fixedly connected with the mobile carrier 41, the blowing head 45 is fixedly connected with the support frame 491 and is arranged in an inclined manner, and the air outlet end of the fan 44 is connected with the blowing head 45;

[0067] In the present application, the mobile carrier 41 moves to the side of the circumferential rib beam 23, the vertical moving assembly 47 controls the downward movement of the detection limiting assembly 48 and the contact type ultrasonic detection mechanism 49, the mobile carrier 41 moves to make the fixed limiting wheel 483 abut against the circumferential rib beam 23, then the first pushing member 481 drives the fixed bracket 482 to retract, so that the fixed limiting wheel 483 and the movable limiting wheel 485 cooperate to clamp and limit the circumferential rib beam 23, and thus the mobile carrier 41 can stably move along the circumferential rib beam 23;

[0068] During the movement of the mobile carrier 41, the circumferential rib beam 23 is blown by the blowing head 45 to blow the dust away from the side surface of the circumferential rib beam 23 or the lug surface, and the medium layer 497 is attached to the side surface of the circumferential rib beam 23, and is rotated under the action of friction around the supporting roller 495 and the guide roller 496, the second pushing member 492 pushes the ultrasonic probe 494 towards the medium layer 497, so that the ultrasonic probe 494 abuts the medium layer 497 against the part to be detected, and the liquid spraying pipe 43 continuously sprays water to the medium layer 497, so that the medium layer 497 is soaked with water, which not only consumes less water, but also makes the ultrasonic probe 494 and the part to be detected have a higher coupling effect, so that the ultrasonic probe 494 can stably detect the uneven weld, and the accuracy of the detection result is ensured. When the ultrasonic probe 494 detects the connection part between the adaptive boom 3 and the circumferential rib beam 23, the mobile carrier 41, the vertical moving assembly 47 and the first pushing member 481 cooperate to avoid the adaptive boom 3, and then the next circumferential rib beam 23 is detected, and the above operation is repeated until the detection of the whole circumferential rib beam 23 is completed.

[0069] Embodiment two: in some embodiments, as a preferred embodiment of the present application, the fixed limiting wheel 483 and the movable limiting wheel 485 adopt rubber wheels, and the fixed limiting wheel 483 and the movable limiting wheel 485 are both provided with a plurality of wheels, and in some embodiments, the movable limiting wheel 485 is provided with two wheels, and the fixed limiting wheel 483 is provided with two wheels, which can not only stabilize the movement track of the mobile carrier 41, but also meet the limiting requirements of the circumferential rib beam 23 with different radii.

[0070] The support frame 491 is hinged to the moving end of the vertical moving assembly 47, and the angle of the support frame 491 is controlled by the rotary driving member, so that the medium layer 497 can be attached to the circumferential rib beam 23 with different radii, and the ultrasonic detection operation requirements of the circumferential rib beam 23 with different radii can be met.

[0071] Embodiment three: in some embodiments, as shown in Figures 1-9 Fig. 3, as a preferred embodiment of the present application, a self-detection method of a large storage tank ceiling comprises the following steps:

[0072] Step one: the mobile carrier 41 moves to the side surface of the circumferential rib beam 23;

[0073] Step two: the vertical moving assembly 47 controls the downward movement of the mobile detection limiting assembly 48 and the contact type ultrasonic detection mechanism 49, the mobile carrier 41 moves to make the fixed limiting wheel 483 attached to the circumferential rib beam 23, and then the first pushing member 481 drives the fixed bracket 482 to retract, so that the fixed limiting wheel 483 and the movable limiting wheel 485 cooperate to clamp and limit the circumferential rib beam 23;

[0074] Step three: the mobile carrier 41 can move along the circumferential rib beam 23;

[0075] Step four: blow air to the circumferential rib beam 23 through the air blowing head 45 to blow dust away from the side surface of the circumferential rib beam 23 or the lug surface, and the medium layer 497 is attached to the side surface of the circumferential rib beam 23, and the medium layer 497 is rotated around the supporting roller 495 and the guide roller 496 under the action of friction, and the liquid spraying pipe 43 continuously sprays water to the medium layer 497;

[0076] Step five: the second pushing member 492 pushes the ultrasonic probe 494 towards the medium layer 497, so that the ultrasonic probe 494 presses the medium layer 497 against the part to be detected, and the circumferential rib beam 23 and the lug are detected by ultrasonic waves;

[0077] Step six: the moving carrier 41, the vertical moving assembly 47 and the first pushing member 481 cooperate to avoid the adaptive boom 3;

[0078] Step seven: steps two to six are repeated until the ultrasonic detection work of the circumferential rib beam 23 is completed.

[0079] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalent ones; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A large storage tank ceiling, comprising an outer roof (1), an inner roof (2) and an adaptive boom (3) installed between the outer roof (1) and the inner roof (2), characterized in that: the inner roof (2) comprises a center plate (21), a support frame and a layer plate (24), the support frame comprises a plurality of circumferential rib beams (23) distributed outward from the center part of the center plate (21) and a plurality of radial rib beams (22) distributed radially, the end of the radial rib beam (22) is fixedly connected with the center plate (21), the radial rib beam (22) and the circumferential rib beam (23) are fixedly connected, and the layer plate (24) is laid along the center plate (21) radially between adjacent radial rib beams (22); the circumferential rib beam (23) and the outer roof (1) are uniformly welded with a plurality of corresponding lifting lugs at equal intervals, the adaptive boom (3) comprises an upper fixed rod (31), an adjustable length section, a temperature insulation block (34), an adaptive temperature control telescopic section and a lower fixed rod (39) connected in turn from top to bottom, the upper fixed rod (31) is connected with the lifting lug of the outer roof (1) through a lifting ring, the lower fixed rod (39) is connected with the lifting lug on the circumferential rib beam (23) through a lifting ring, the temperature in the storage tank is transmitted to the adaptive temperature control telescopic section along the lower connecting section and is blocked by the temperature insulation block (34), the adaptive temperature control telescopic section extends when cooling and shrinks when heating; the layer plate (24) is further provided with a self-propelled ultrasonic detection mechanism (4) for moving along the circumferential rib beam (23); the adaptive temperature control telescopic section comprises a piston rod (35), a piston head (36) and a temperature control adjusting block (37), the upper end of the piston rod (35) is fixedly connected with the temperature insulation block (34), the lower end of the piston rod (35) is fixedly connected with the piston head (36), the lower end of the temperature control adjusting block (37) is fixedly connected with the lower fixed rod (39), the upper end of the temperature control adjusting block (37) is provided with a piston cavity (38), the piston cavity (38) is provided with an expanded gas, the piston head (36) is limitingly and slidably connected with the piston cavity (38), and the piston rod (35) is connected with the upper end of the piston cavity (38) in a clearance fit, so as to realize the sealing effect of the piston cavity (38); the self-propelled ultrasonic detection mechanism (4) comprises a mobile carrier (41), a vertical moving assembly (47), a moving detection limiting assembly (48) and a contact type ultrasonic detection mechanism (49), a monitoring probe for observing the surrounding environment is fixedly installed on the top of the mobile carrier (41); the vertical moving assembly (47) is installed on the side of the mobile carrier (41), the moving end of the vertical moving assembly (47) is provided with the moving detection limiting assembly (48) and the contact type ultrasonic detection mechanism (49), the moving detection limiting assembly (48) is used for stably moving the mobile carrier (41) along the circumferential rib beam (23), and the contact type ultrasonic detection mechanism (49) is used for closely contacting the circumferential rib beam (23) and performing ultrasonic detection; an obstacle crossing assembly (46) for assisting the mobile carrier (41) to cross the circumferential rib beam (23) is installed on the side of the mobile carrier (41). The contact type ultrasonic detection mechanism (49) comprises a support frame (491) and a close coupling mechanism and an ultrasonic detection assembly installed on the support frame (491), the support frame (491) is fixedly connected with the moving end of the vertical moving assembly (47), and the close coupling mechanism is located between the ultrasonic detection assembly and the circumferential rib beam (23); The close coupling mechanism comprises support rollers (495), guide rollers (496), a medium layer (497) and a water spraying assembly, the support rollers (495) are provided with two and are rotationally connected with the support frame (491), the guide rollers (496) are provided with two and are rotationally connected with the support frame (491), the medium layer (497) is arranged on the outer side of the support rollers (495) and between the support rollers (495) and the guide rollers (496), so that the support rollers (495) and the guide rollers (496) are drivingly connected; the medium layer (497) between the two support rollers (495) constitutes a first contact layer, the medium layer (497) between the two guide rollers (496) constitutes a second contact layer, and the first contact layer and the second contact layer are arranged in parallel.

2. The large storage tank ceiling according to claim 1, characterized by The moving detection limiting assembly (48) comprises a fixed limiting assembly, a movable limiting assembly and a first pushing piece (481), the fixed limiting assembly is fixedly connected with the moving end of the vertical moving assembly (47), and the first pushing piece (481) is installed on the fixed limiting assembly, and the output end of the first pushing piece (481) is fixedly connected with the movable limiting assembly.

3. The large storage tank ceiling according to claim 2, characterized in that, The ultrasonic detection assembly comprises a second pushing piece (492), a connecting plate (493) and ultrasonic probes (494), the second pushing piece (492) is fixedly connected with the support frame (491), the output end of the second pushing piece (492) is fixedly installed with the connecting plate (493), and the connecting plate (493) is fixedly installed with a plurality of ultrasonic probes (494).

4. The large storage tank ceiling according to claim 3, characterized in that, The water spraying assembly comprises a liquid storage tank (42) and a liquid spraying pipe (43), the liquid storage tank (42) is fixedly installed on the moving carrier (41), one end of the liquid spraying pipe (43) is fixedly connected with the liquid storage tank (42), the other end of the liquid spraying pipe (43) is fixedly connected with the support frame (491), and the water outlet end of the support frame (491) is fixedly installed with a nozzle facing the medium layer (497).

5. The large storage tank ceiling according to claim 4, characterized in that, The support frame (491) is further installed with a blowing and dust cleaning mechanism for cleaning dust on the detection part before ultrasonic detection.

6. A self-checking method for the roof of a large storage tank according to claim 5, characterized in that, The method comprises the following steps: Step one: the moving carrier (41) moves to the side of the circumferential rib beam (23); Step two: the vertical moving assembly (47) controls the moving detection limiting assembly (48) and the contact type ultrasonic detection mechanism (49) to move downward, the moving carrier (41) moves to make the fixed limiting assembly fit the circumferential rib beam (23), then the first pushing piece (481) drives the movable limiting assembly to retract, so that the fixed limiting assembly and the movable limiting assembly clamp and limit the circumferential rib beam (23); Step three: the moving carrier (41) can move along the circumferential rib beam (23). Step four: blow the dust away from the side of the circumferential rib beam (23) or the lug surface by blowing the circumferential rib beam (23) through the blowing and dust removing mechanism, and the medium layer (497) is attached to the side of the circumferential rib beam (23), and the medium layer (497) rotates around the supporting roller (495) and the guide roller (496) under the action of friction, and the liquid injection pipe (43) continuously sprays water to the medium layer (497); Step five: the second pushing member (492) pushes the ultrasonic probe (494) towards the medium layer (497), so that the ultrasonic probe (494) presses the medium layer (497) against the to-be-detected part, and the circumferential rib beam (23) and the lug are detected by ultrasonic waves; Step six: the moving carrier (41), the vertical moving assembly (47) and the first pushing member (481) cooperate to avoid the self-adaptive boom (3); Step seven: repeat steps two to six until the ultrasonic wave detection work of a whole circumferential rib beam (23) is completed.

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