Large storage tank suspended ceiling and method thereof

Abstract

The invention discloses a large storage tank suspended ceiling and a method thereof, and belongs to the technical field of low-temperature storage tanks. The large storage tank suspended ceiling comprises an outer ceiling, an inner ceiling and a self-adaptive suspender installed between the outer ceiling and the inner ceiling. The self-adaptive suspender comprises an upper fixing rod, a length adjusting section, a heat insulation block, a self-adaptive temperature control telescopic section and a lower fixing rod which are sequentially connected from top to bottom, in this way, the radial ribbed beams and the circumferential ribbed beams form a supporting frame, the circumferential ribbed beams are connected with the outer top to support the inner top, and after a low-temperature medium is injected into the tank body, the inner top is connected with the outer top to support the inner top. When a low-temperature medium in the storage tank is discharged, the temperature is gradually increased, the self-adaptive temperature control telescopic section is heated to shrink and deform, 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 heat insulation block, and the self-adaptive temperature control telescopic section is cooled to extend, so that the length of the whole self-adaptive hanging rod is increased; therefore, the self-adaptive suspender always adapts to deformation of the inner top, and fatigue fracture of the self-adaptive suspender is avoided.

Description

Technical Field

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

[0002] Chinese patent CN104533003A discloses a suspended ceiling for a large storage tank. The suspended ceiling includes: a grid, which is constructed from profiles of a certain shape; corrugated boards, which are multiple pieces of corrugated boards connected together by splicing and laid above the grid; and a hanger, one end of which is connected to the grid and is used to hang the suspended ceiling above the storage tank. The components of the suspended ceiling do not require welding, are light in weight, and reduce the load on the tank top grid. However, the suspended ceiling still has the following problems: 1. After storing low-temperature media, the inner top of the tank body is prone to cold shrinkage, which creates a downward pull on the boom, easily causing fatigue in the lugs connected to the ends of the boom. In addition, the temperature of the inner top will be transferred upward along the boom, forming a cold bridge on the boom, which makes the side where the boom is connected to the outer top prone to deterioration.

[0003] 2. The suspended ceiling requires regular maintenance and inspection to check whether there is corrosion, deformation, cracks, etc. The circumferential rib beam is used to connect with the lower end of the hanger to bear the weight of the entire inner ceiling. It is inconvenient and inaccurate to judge whether there is any abnormality by visual observation alone.

[0004] 3. When using an ultrasonic probe to perform flaw detection on a workpiece, a coupling medium needs to be applied between the probe and the workpiece to be inspected so that the ultrasonic wave can smoothly penetrate into the workpiece. Common coupling media include water and oil. However, the viscosity of water is relatively low, and a small amount of water cannot fill the unevenness on the surface of the workpiece to be inspected. Applying a large amount of water requires frequent replenishment. If an oil medium is used, it will contaminate the surface of the workpiece to be inspected, making it easy for the workpiece to be inspected to absorb dust and become dirty.

[0005] Based on this, the present invention designs a large storage tank ceiling and a method thereof to solve the above problems. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a large storage tank suspended ceiling and a method thereof.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A large storage tank ceiling, comprising an outer roof, an inner roof, and an adaptive suspension rod installed between the outer roof and the inner roof; The inner roof includes a center plate, a support frame and layer plates. The support frame includes a plurality of circumferential ribs distributed from the center portion of the center plate to the periphery and a plurality of radial ribs distributed radially. The ends of the radial ribs are fixedly connected to the center plate. The radial ribs are fixedly connected to the circumferential ribs. Layer plates are laid between adjacent radial ribs along the radial direction of the center plate. Multiple, one-to-one corresponding lifting lugs are evenly welded on the circumferential ribs and the outer top at equal intervals. The adaptive hanging rod includes an upper fixed rod, a length-adjustable section, a temperature-insulating block, an adaptive temperature-controlled telescopic section, and a lower fixed rod, which are connected in sequence from top to bottom. The upper fixed rod is connected to the lifting lug of the outer top via a lifting ring, and the lower fixed rod is connected to the lifting lug on the circumferential ribs via a lifting ring. The temperature inside the tank is transmitted to the adaptive temperature-controlled telescopic section along the lower connecting section and is blocked by the temperature-insulating block. The adaptive temperature-controlled telescopic section extends when the temperature drops and contracts when the temperature rises. The layer plate is also provided with a self-propelled ultrasonic detection mechanism for moving along the circumferential rib beam.

[0008] Furthermore, the adaptive temperature-controlled telescopic section includes a piston rod, a piston head and a temperature-controlled adjustment block. The upper end of the piston rod is fixedly connected to the insulation block, the lower end of the piston rod is fixedly connected to the piston head, the lower end of the temperature-controlled adjustment block is fixedly connected to the lower fixed rod, and a piston cavity is opened at the upper end of the temperature-controlled adjustment block. Expansion gas is provided in the piston cavity. The piston head is limitedly and slidably connected to the piston cavity, and the piston rod is gap-fittedly connected to the upper end of the piston cavity to achieve a sealing effect of the piston cavity.

[0009] Furthermore, the self-propelled ultrasonic detection mechanism includes a mobile vehicle, a vertical moving component, a mobile detection limit component and a contact ultrasonic detection mechanism. A monitoring probe for observing the surrounding environment is fixedly installed on the top of the mobile vehicle; a vertical moving component is installed on the side of the mobile vehicle, and a mobile detection limit component and a contact ultrasonic detection mechanism are installed on the moving end of the vertical moving component. The mobile detection limit component is used to make the mobile vehicle move stably along the circumferential rib beam, and the contact ultrasonic detection mechanism is used to make close contact with the circumferential rib beam and perform ultrasonic detection; an obstacle crossing component for assisting the mobile vehicle to cross the circumferential rib beam is installed on the side of the mobile vehicle.

[0010] Furthermore, the mobile detection limit assembly includes a fixed limit assembly, a movable limit assembly and a first pushing member. The fixed limit assembly is fixedly connected to the movable end of the vertical moving assembly. The first pushing member is installed on the fixed limit assembly. The output end of the first pushing member is fixedly connected to the movable limit assembly.

[0011] Furthermore, the contact ultrasonic detection mechanism includes a support frame and a tight coupling mechanism and an ultrasonic detection component installed on the support frame. The support frame is fixedly connected to the moving end of the vertical moving component, and the tight coupling mechanism is located between the ultrasonic detection component and the circumferential rib beam.

[0012] Furthermore, the tight coupling mechanism includes a support roller, a guide roller, a medium layer and a water spray assembly. Two support rollers are provided and are rotatably connected to the support frame. Two guide rollers are provided and are also rotatably connected to the support frame. The medium layer is wound 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 transmission-connected; the medium layer between the two support rollers constitutes a first contact layer, and the medium layer between the two guide rollers constitutes a second contact layer. The first contact layer and the second contact layer are arranged in parallel.

[0013] Furthermore, the ultrasonic detection component includes a second pushing member, a connecting plate and an ultrasonic probe. The second pushing member is fixedly connected to the support frame. The output end of the second pushing member is fixedly installed with a connecting plate, and a plurality of ultrasonic probes are fixedly installed on the connecting plate.

[0014] Furthermore, the water spray assembly includes a liquid storage tank and a liquid spray pipe. The liquid storage tank is fixedly installed on the mobile vehicle. One end of the liquid spray pipe is fixedly connected to the liquid storage tank, and the other end of the liquid spray pipe is fixedly connected to the support frame. The water outlet end of the support frame is fixedly installed with a nozzle facing the medium layer.

[0015] Furthermore, a blowing and dust cleaning mechanism is installed on the support frame to clean the dust on the part to be detected before ultrasonic detection.

[0016] In order to better achieve the purpose of the present invention, the present invention also provides a self-inspection method for a large storage tank ceiling, comprising the following steps: Step 1: Move the carrier to the side of the circumferential rib beam; Step 2: The vertical moving assembly controls the moving detection limit assembly and the contact ultrasonic detection mechanism to move downward, and the moving carrier moves to make the fixed limit assembly fit with the circumferential rib beam. Then, the first pushing member drives the movable limit assembly to retract, so that the fixed limit assembly and the movable limit assembly cooperate to clamp the circumferential rib beam and limit it. Step 3: The mobile carrier can move along the circumferential rib beam; Step 4: The blowing and cleaning mechanism blows air toward the circumferential ribs to remove dust from the sides of the circumferential ribs or the surfaces of the lugs. The dielectric layer adheres to the sides of the circumferential ribs, and the friction force causes the dielectric layer to rotate around the support roller and the guide roller. The liquid spraying pipe continuously sprays water toward the dielectric layer. Step 5: The second pushing member pushes the ultrasonic probe toward the dielectric layer, so that the ultrasonic probe presses the dielectric layer against the portion to be tested, and performs ultrasonic testing on the circumferential ribs and the lugs; Step 6: The mobile carrier, the vertical moving assembly, and the first pushing member cooperate to avoid the adaptive boom; Step 7: Repeat steps 2 to 6 until the ultrasonic testing of a whole circle of circumferential ribs is completed.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The radial ribs and the circumferential ribs constitute a supporting frame. The circumferential ribs provide support for the inner top by being connected to the outer top. When a low-temperature medium is injected into the tank body, the inner top cools down and shrinks as a whole to deform. The temperature in the storage tank is transmitted to the adaptive temperature-controlled telescopic section along the lower connecting section and is blocked by the insulation block. The adaptive temperature-controlled telescopic section cools down and extends, thereby extending the length of the entire adaptive hanger. When the low-temperature medium in the storage tank is discharged, the temperature gradually rises, while the adaptive temperature-controlled telescopic section heats up and shrinks, thereby allowing the adaptive hanger to always adapt to the deformation of the inner top, ensuring that the adaptive hanger is evenly stressed and avoiding fatigue fracture of the adaptive hanger. At the same time, the cold bridge is disconnected by the insulation block to avoid temperature transfer. 2. The fixed limiting wheel and the movable limiting wheel cooperate to clamp and limit the circumferential rib beam, thereby allowing the mobile carrier to move stably along the circumferential rib beam; During the movement of the mobile carrier, air is blown to the circumferential ribs through the blower head to blow away the dust on the side of the circumferential ribs or the surface of the ear, and the medium layer fits against the side of the circumferential ribs. Under the action of friction, the medium layer rotates around the support roller and the guide roller, and the second pushing member pushes the ultrasonic probe toward the medium layer, so that the ultrasonic probe presses the medium layer against the part to be inspected, and the spray pipe continuously sprays water to the medium layer, so that the medium layer is soaked with water. Not only is the water consumption low, but the ultrasonic probe and the part to be inspected maintain a high coupling effect. Even uneven welds can be stably released by the ultrasonic probe to ensure the accuracy of the test results. After the ultrasonic probe detects the connection between the adaptive boom and the circumferential rib, the mobile carrier, the vertical moving assembly and the first pushing member cooperate to avoid the adaptive boom, and then detect the next section of the circumferential rib. The above actions are repeated until the inspection of a whole circle of circumferential ribs is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0019] Figure 1 This is a structural schematic diagram of a large storage tank ceiling according to the present invention; Figure 2 This is a schematic structural diagram of the inner top of the present invention; Figure 3 It is a structural schematic diagram of the adaptive boom of the present invention; Figure 4 A front half-section view of the adaptive boom of the present invention; Figure 5The self-propelled ultrasonic detection mechanism of the present invention is a three-dimensional Figure 1 ; Figure 6 The self-propelled ultrasonic detection mechanism of the present invention is a three-dimensional Figure 2 ; Figure 7 A perspective view of the mobile detection and limiting assembly of the present invention; Figure 8 The three-dimensional structure of the touch ultrasonic detection mechanism of the present invention Figure 1 ; Figure 9 The three-dimensional structure of the touch ultrasonic detection mechanism of the present invention Figure 2 .

[0020] The numbers in the figure represent: 1. Outer top; 2. Inner top; 21. Center plate; 22. Radial ribs; 23. Circumferential ribs; 24. Shelf; 3. Adaptive suspender; 31. Upper fixed rod; 32. Adjustable screw; 33. Adjustable cylinder; 34. Insulation block; 35. Piston rod; 36. Piston head; 37. Temperature control block; 38. Piston chamber; 39. Lower fixed rod; 4. Self-propelled ultrasonic detection mechanism; 41. Mobile carrier; 42. Liquid storage tank; 43. Liquid spray pipe; 44. Fan; 45. Blowing head; 46. 6. Obstacle crossing assembly; 461. Push rod; 462. Push block; 47. Vertical moving assembly; 48. Mobile detection limit assembly; 481. First pushing member; 482. Fixed bracket; 483. Fixed limit wheel; 484. Movable bracket; 485. Movable limit 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. Dielectric layer. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0022] The terms “left,” “right,” “front,” “back,” “up,” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0023] Example 1: In some embodiments, please refer to the accompanying drawings of the specification. Figure 1-Figure 4 A large storage tank ceiling comprises an outer roof 1, an inner roof 2 and an adaptive suspension rod 3 installed between the outer roof 1 and the inner roof 2; The inner roof 2 includes a center plate 21, a support frame, and layer plates 24. The support frame includes a plurality of circumferential ribs 23 distributed from the center portion of the center plate 21 to the periphery and a plurality of radial ribs 22 distributed radially. The ends of the radial ribs 22 are fixedly connected to the center plate 21. The radial ribs 22 and the circumferential ribs 23 are welded and fixed. Layer plates 24 are laid between adjacent radial ribs 22 along the radial direction of the center plate 21. The layer plates 24 can be made of steel plates, corrugated plates, etc. The layer plates 24 are connected to the radial ribs 22 by fasteners such as bolts or welded. The inner roof 2 can be a dome or a flat roof. A plurality of corresponding lifting ears are evenly welded on the circumferential rib beam 23 and the outer top 1 at equal intervals. The adaptive suspension rod 3 includes an upper fixed rod 31, a length-adjustable section, a thermal insulation block 34, an adaptive temperature-controlled telescopic section, and a lower fixed rod 39, which are sequentially connected from top to bottom. The upper fixed rod 31 is connected to the lifting ear of the outer top 1 through a lifting ring, and the lower fixed rod 39 is connected to the lifting ear on the circumferential rib beam 23 through a lifting ring. The temperature in the storage tank is transmitted to the adaptive temperature-controlled telescopic section along the lower connecting section and is blocked by the thermal insulation block 34. The adaptive temperature-controlled telescopic section extends when the temperature drops and contracts when the temperature rises. A self-propelled ultrasonic detection mechanism 4 is also installed on the layer plate 24 for moving along the circumferential rib beam 23 .

[0024] In the present invention, the radial ribs 22 and the circumferential ribs 23 constitute a supporting frame. The circumferential ribs 23 provide support for the inner top by being connected to the outer top 1. When a low-temperature medium is injected into the tank body, the inner top 2 cools down and shrinks as a whole to deform. The temperature in the tank is transmitted to the adaptive temperature-controlled telescopic section along the lower connecting section and is blocked by the insulation block 34. The adaptive temperature-controlled telescopic section cools down and extends, thereby extending the length of the entire adaptive hanger 3. When the low-temperature medium in the tank is discharged, the temperature gradually rises, and the adaptive temperature-controlled telescopic section heats up and shrinks, thereby allowing the adaptive hanger 3 to always adapt to the deformation of the inner top 2, ensuring that the adaptive hanger 3 is evenly stressed and avoiding fatigue fracture of the adaptive hanger 3. At the same time, the cold bridge is disconnected by the insulation block 34 to avoid temperature transfer. The length adjustment section includes a length adjustment screw 32 and a length adjustment tube 33. The length adjustment screw 32 is fixedly connected to the upper fixed rod 31, and the length adjustment tube 33 is fixedly connected to the insulation block 34. The length adjustment screw 32 is threadedly connected to the inner side of the length adjustment tube 33, and a locking nut is also provided on the length adjustment screw 32 to prevent the length adjustment screw 32 and the length adjustment tube 33 from loosening. The thermal insulation block 34 can be made of thermally-insulated aluminum profile integrated composite metal material to meet the requirements of high strength and high thermal insulation.

[0025] The adaptive temperature-controlled telescopic section includes a piston rod 35, a piston head 36 and a temperature-controlled adjustment block 37. The upper end of the piston rod 35 is fixedly connected to the insulation block 34, the lower end of the piston rod 35 is fixedly connected to the piston head 36, the lower end of the temperature-controlled adjustment block 37 is fixedly connected to the lower fixed rod 39, and a piston cavity 38 is provided at the upper end of the temperature-controlled adjustment block 37. A gas with a high thermal expansion coefficient, such as ammonia, is provided in the piston cavity 38. The piston head 36 is connected to the piston cavity 38 in a limited sliding manner, and the piston rod 35 is connected to the upper end of the piston cavity 38 with a clearance fit to achieve a sealing effect of the piston cavity 38.

[0026] See also Figure 5-Figure 9 The self-propelled ultrasonic detection mechanism 4 includes a mobile carrier 41, a vertical moving component 47, a mobile detection limit component 48 and a contact ultrasonic detection mechanism 49. The mobile carrier 41 adopts mature technology in this field, has a built-in 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; a vertical moving component 47 is installed on the side of the mobile carrier 41, and the vertical moving component 47 can adopt a linear module or a pneumatic slide; a mobile detection limit component 48 and a contact ultrasonic detection mechanism 49 are installed on the moving end of the vertical moving component 47. The mobile detection limit component 48 is used to make the mobile carrier 41 move stably along the circumferential rib 23, and the contact ultrasonic detection mechanism 49 is used to closely contact the circumferential rib 23 and perform ultrasonic detection; The self-propelled ultrasonic detection mechanism 4 may be provided with several units for performing ultrasonic detection on different circumferential ribs 23 respectively; In some embodiments, only one self-propelled ultrasonic detection mechanism 4 is provided, and an obstacle crossing component 46 is installed on the side of the mobile vehicle 41 to assist the mobile vehicle 41 in crossing the circumferential ribs 23, thereby performing ultrasonic detection on different circumferential ribs 23; The obstacle crossing components 46 are provided in two groups and are symmetrically distributed on the left and right sides of the mobile vehicle 41. Each group of obstacle crossing components 46 includes a shift rod 461 symmetrically mounted on the front and rear sides of the mobile vehicle 41. A rotary driving component is installed in the mobile vehicle 41. The output end of the rotary driving component is fixedly connected to one end of the shift rod 461. The other end of the shift rod 461 is fixedly mounted with a shift block 462. The shift block 462 is made of rubber material with greater friction. The rotary driving component can be a rotary cylinder or a motor. When the mobile vehicle 41 moves to the side of the circumferential rib 23, one side of the mobile vehicle 41 can be tilted by driving the rotation. After the mobile vehicle 41 uses the wheels to move a part of the mobile vehicle 41 across the circumferential rib 23, the other side of the mobile vehicle 41 is alternately tilted to realize the crossing operation of the mobile vehicle 41 over the circumferential rib 23.

[0027] The mobile detection limit assembly 48 includes a fixed limit assembly, a movable limit assembly and a first pusher 481. The fixed limit assembly is fixedly connected to the movable end of the vertical moving assembly 47. The first pusher 481 is mounted on the fixed limit assembly. The output end of the first pusher 481 is fixedly connected to the movable limit assembly. The first pusher 481 can be a dual-axis cylinder. 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 to the movable end of the vertical moving assembly 47, and the fixed limiting wheel 483 is rotatably mounted on the fixed bracket 482 through a bearing. The first pushing member 481 is fixedly mounted on the upper end of the fixed bracket 482, and the output end of the first pushing member 481 is fixedly connected to the movable bracket 484. The movable limiting wheel 485 is rotatably mounted on the movable bracket 484 through a bearing. The contact ultrasonic detection mechanism 49 includes a support frame 491 and a close coupling mechanism and an ultrasonic detection assembly mounted on the support frame 491. The support frame 491 is fixedly connected to the moving end of the vertical moving assembly 47. The close coupling mechanism is located between the ultrasonic detection assembly and the circumferential rib 23. The tightly coupled mechanism includes a support roller 495, a guide roller 496, a dielectric layer 497, and a water spray assembly. Two support rollers 495 are provided and are rotatably connected to the support frame 491. Two guide rollers 496 are provided and are also rotatably connected to the support frame 491. The dielectric layer 497 is wound around the outside of the support roller 495 and between the support roller 495 and the guide roller 496, so that the support roller 495 and the guide roller 496 are in transmission connection. The dielectric layer 497 between the two support rollers 495 constitutes a first contact layer, and the dielectric 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 with a certain gap between them, which can be set to five millimeters. The medium layer 497 can be made of cotton cloth, gauze, etc., which has good water absorption and a compact structure.

[0028] The ultrasonic detection assembly includes a second pushing member 492, a connecting plate 493 and an ultrasonic probe 494. The second pushing member 492 is fixedly connected to the support frame 491. The second pushing member 492 can be a double-axis cylinder. The output end of the second pushing member 492 is fixedly mounted with a connecting plate 493, and a plurality of ultrasonic probes 494 are fixedly mounted on the connecting plate 493. The water spray assembly includes a liquid storage tank 42 and a liquid spray pipe 43. The liquid storage tank 42 is fixedly mounted on the mobile vehicle 41. One end of the liquid spray pipe 43 is fixedly connected to the liquid storage tank 42, and the other end of the liquid spray pipe 43 is fixedly connected to the support frame 491. A nozzle facing the dielectric layer 497 is fixedly mounted on the water outlet end of the support frame 491. A pump body is installed in the liquid storage tank 42 for pumping water in the liquid storage tank 42 out of the liquid spray pipe 43. The support frame 491 is also equipped with a purge and dust cleaning mechanism for cleaning dust from the area to be detected before ultrasonic detection.

[0029] The blowing and dust cleaning mechanism includes a fan 44 and a blowing head 45. The fan 44 is fixedly connected to the mobile carrier 41. The blowing head 45 is fixedly connected to the support frame 491 and is tilted. The air outlet end of the fan 44 is connected to the blowing head 45. In the present invention, the mobile carrier 41 moves to the side of the circumferential rib 23, and the vertical moving component 47 controls the moving detection limit component 48 and the contact ultrasonic detection mechanism 49 to move downward. The mobile carrier 41 moves so that the fixed limit wheel 483 is in contact with the circumferential rib 23. Then, the first pushing member 481 drives the fixed bracket 482 to retract, so that the fixed limit wheel 483 and the movable limit wheel 485 cooperate to clamp the circumferential rib 23 and limit it, thereby allowing the mobile carrier 41 to move stably along the circumferential rib 23. During the movement of the mobile carrier 41, air is blown toward the circumferential rib 23 through the blower head 45 to blow away the dust on the side of the circumferential rib 23 or the surface of the ear, and the dielectric layer 497 is in contact with the side of the circumferential rib 23. Under the action of friction, the dielectric layer 497 rotates around the support roller 495 and the guide roller 496. The second pushing member 492 pushes the ultrasonic probe 494 toward the dielectric layer 497, so that the ultrasonic probe 494 presses the dielectric layer 497 against the part to be detected, and the liquid spraying pipe 43 continuously sprays water toward the dielectric layer 497, so that the dielectric layer 497 is Water infiltration not only consumes less water, but also enables the ultrasonic probe 494 to maintain a high coupling effect with the part to be inspected. Even uneven welds can be stably released by the ultrasonic probe 494 to ensure the accuracy of the detection results. After the ultrasonic probe 494 detects the connection between the adaptive boom 3 and the circumferential rib 23, the mobile carrier 41, the vertical moving component 47 and the first pushing member 481 cooperate to avoid the adaptive boom 3, and then detect the next section of the circumferential rib 23. The above actions are repeated until the detection operation of a whole circle of circumferential ribs 23 is completed.

[0030] Embodiment 2: In some embodiments, as a preferred embodiment of the present invention, the fixed limiting wheel 483 and the movable limiting wheel 485 are rubber wheels, and there are several fixed limiting wheels 483 and movable limiting wheels 485. In some embodiments, there are two movable limiting wheels 485 and two fixed limiting wheels 483, which can achieve stable limiting of the motion trajectory of the mobile carrier 41 and meet the limiting requirements of circumferential ribs 23 with different radii.

[0031] The support frame 491 is hinged with 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 different circumferential rib beams 23 can be met.

[0032] In some embodiments, as shown in Figures 1-9 As a preferred embodiment of the present application, a self-checking method for a large storage tank ceiling is provided, which 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 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; Step three: the moving carrier 41 can move along the circumferential rib beam 23; Step four: the air blowing head 45 blows air to the circumferential rib beam 23 to blow away the dust on the side of the circumferential rib beam 23 or the lug surface, and the medium layer 497 is attached to the side of the circumferential rib beam 23, so that the medium layer 497 rotates around the support 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; 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 on the to-be-detected part, and the circumferential rib beam 23 and the lug are subjected to ultrasonic detection; Step six: the moving carrier 41, the vertical moving assembly 47 and the first pushing member 481 cooperate to avoid the adaptive boom 3; Step seven: steps two to six are repeated until the ultrasonic detection operation of the circumferential rib beam 23 is completed.

[0033] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; 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 equivalents; 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 suspension rod (3) installed between the outer roof (1) and the inner roof (2), characterized in that: The inner top (2) includes a central plate (21), a support frame, and a layer plate (24); the support frame includes a plurality of circumferential rib beams (23) distributed from the central portion of the central plate (21) to the periphery and a plurality of radial rib beams (22) distributed radially; the ends of the radial rib beams (22) are fixedly connected to the central plate (21); the radial rib beams (22) and the circumferential rib beams (23) are fixedly connected; and layer plates (24) are laid between adjacent radial rib beams (22) along the radial direction of the central plate (21); A plurality of corresponding lifting ears are uniformly welded on the circumferential rib beam (23) and the outer top (1) at equal intervals. The adaptive suspension rod (3) includes an upper fixed rod (31), a length adjustment section, a temperature insulation block (34), an adaptive temperature control telescopic section, and a lower fixed rod (39) connected in sequence from top to bottom. The upper fixed rod (31) is connected to the lifting ear of the outer top (1) through a lifting ring. The lower fixed rod (39) is connected to the lifting ear on the circumferential rib beam (23) through a lifting ring. The temperature in the storage tank is transferred 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 the temperature drops and contracts when the temperature rises. A self-propelled ultrasonic detection mechanism (4) for moving along the circumferential rib beam (23) is also installed on the layer plate (24).

2. The large storage tank ceiling according to claim 1, characterized in that: The self-adaptive temperature-controlled telescopic section comprises a piston rod (35), a piston head (36) and a temperature-controlled regulating block (37); the upper end of the piston rod (35) is fixedly connected to the temperature-insulating block (34); the lower end of the piston rod (35) is fixedly connected to the piston head (36); the lower end of the temperature-controlled regulating block (37) is fixedly connected to the lower fixed rod (39); a piston cavity (38) is provided at the upper end of the temperature-controlled regulating block (37); expansion gas is provided in the piston cavity (38); the piston head (36) is connected to the piston cavity (38) in a limited sliding manner; the piston rod (35) is connected to the upper end of the piston cavity (38) in a clearance fit manner, thereby achieving a sealing effect of the piston cavity (38).

3. The large storage tank ceiling according to claim 1, characterized in that: The self-propelled ultrasonic detection mechanism (4) comprises a mobile carrier (41), a vertical moving component (47), a mobile detection limit component (48) and a contact ultrasonic detection mechanism (49), wherein a monitoring probe for observing the surrounding environment is fixedly installed on the top of the mobile carrier (41); a vertical moving component (47) is installed on the side of the mobile carrier (41), and a mobile detection limit component (48) and a contact ultrasonic detection mechanism (49) are installed on the moving end of the vertical moving component (47), wherein the mobile detection limit component (48) is used to enable the mobile carrier (41) to stably move along the circumferential rib (23), and the contact ultrasonic detection mechanism (49) is used to closely contact the circumferential rib (23) and perform ultrasonic detection; and an obstacle crossing component (46) for assisting the mobile carrier (41) to cross the circumferential rib (23) is installed on the side of the mobile carrier (41).

4. The large storage tank ceiling according to claim 3, characterized in that: The mobile detection limit assembly (48) comprises a fixed limit assembly, a movable limit assembly and a first pushing member (481), wherein the fixed limit assembly is fixedly connected to the movable end of the vertical moving assembly (47), the first pushing member (481) is mounted on the fixed limit assembly, and the output end of the first pushing member (481) is fixedly connected to the movable limit assembly.

5. The large storage tank ceiling according to claim 4, characterized in that: The contact ultrasonic detection mechanism (49) includes a support frame (491) and a tight coupling mechanism and an ultrasonic detection assembly mounted on the support frame (491). The support frame (491) is fixedly connected to the movable end of the vertical movable assembly (47), and the tight coupling mechanism is located between the ultrasonic detection assembly and the circumferential rib beam (23).

6. The large storage tank ceiling according to claim 5, characterized in that: The tightly coupled mechanism comprises a support roller (495), a guide roller (496), a medium layer (497) and a water spray assembly. Two support rollers (495) are provided and are rotatably connected to the support frame (491). Two guide rollers (496) are provided and are also rotatably connected to the support frame (491). The medium layer (497) is wound around the outside of the support roller (495) and between the support roller (495) and the guide roller (496), so that the support roller (495) and the guide roller (496) are transmission-connected. The medium layer (497) between the two support rollers (495) constitutes a first contact layer, and 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.

7. The large storage tank ceiling according to claim 6, characterized in that: The ultrasonic detection assembly comprises a second pushing member (492), a connecting plate (493) and an ultrasonic probe (494); the second pushing member (492) is fixedly connected to the support frame (491); the output end of the second pushing member (492) is fixedly mounted with a connecting plate (493); and a plurality of ultrasonic probes (494) are fixedly mounted on the connecting plate (493).

8. The large storage tank ceiling according to claim 7, characterized in that: The water spray assembly comprises a liquid storage tank (42) and a liquid spray pipe (43), wherein the liquid storage tank (42) is fixedly mounted on the mobile vehicle (41), one end of the liquid spray pipe (43) is fixedly connected to the liquid storage tank (42), and the other end of the liquid spray pipe (43) is fixedly connected to the support frame (491), and a spray head facing the medium layer (497) is fixedly mounted on the water outlet end of the support frame (491).

9. The large storage tank ceiling according to claim 8, characterized in that: The support frame (491) is also provided with a blowing and dust cleaning mechanism for cleaning dust from the part to be detected before ultrasonic detection.

10. A self-test method for the large storage tank ceiling according to claim 9, characterized in that: The following steps are involved: Step 1: The mobile carrier (41) moves to the side of the circumferential rib beam (23); Step 2: The vertical moving assembly (47) controls the moving detection limit assembly (48) and the contact ultrasonic detection mechanism (49) to move downward, and the moving carrier (41) moves to make the fixed limit assembly fit with the circumferential rib beam (23), and then the first pushing member (481) drives the movable limit assembly to retract, so that the fixed limit assembly and the movable limit assembly cooperate to clamp the circumferential rib beam (23) to limit the position; Step 3: The moving carrier (41) moves along the circumferential rib (23); Step 4: Blow air toward the circumferential rib (23) through the dust-clearing mechanism to blow away dust on the side of the circumferential rib (23) or the surface of the lug, and the medium layer (497) is in contact with the side of the circumferential rib (23). Under the action of friction, the medium layer (497) rotates around the support roller (495) and the guide roller (496), and the liquid spraying pipe (43) continuously sprays water toward the medium layer (497); Step 5: The second pushing member (492) pushes the ultrasonic probe (494) toward the dielectric layer (497), so that the ultrasonic probe (494) presses the dielectric layer (497) against the part to be tested, and performs ultrasonic testing on the circumferential rib (23) and the hanging lug; Step 6: The mobile carrier (41), the vertical moving assembly (47) and the first pushing member (481) cooperate to avoid the adaptive boom (3); Step 7: Repeat steps 2 to 6 until the ultrasonic testing of a whole circle of circumferential ribs (23) is completed.

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