DR imaging detection device for LNG storage tanks

Abstract

A DR imaging detection device for an LNG storage tank comprises a mounting frame and a remote controller, wherein a controller, a walking mechanism and a DR imaging mechanism are arranged on the mounting frame, and first and second guide rails arranged downward are arranged on both sides of the mounting frame. The present invention provides a DR imaging detection device for an LNG storage tank, wherein a walking mechanism is designed on the mounting frame, and a first and second guide rails are also designed on the mounting frame, and the traveling mechanism, the first guide rail, the second guide rail and the hoisting mechanism cooperate to realize the horizontal and vertical movement detection operation of the DR imaging mechanism.

Description

Technical Field

[0001] The invention belongs to the technical field of LNG storage tank flaw detection, and in particular relates to a DR imaging detection device for LNG storage tanks. Background Art

[0002] LNG storage tanks are the main equipment of LNG gasification stations. Currently, large LNG storage tanks are generally welded with special steel plates. After the welding of LNG storage tanks is completed, it is necessary to perform nondestructive testing on the welds to avoid leakage in the welds of LNG storage tanks.

[0003] At present, inspectors have summarized two technical problems in the process of inspecting the welds of welded LNG storage tanks. 1. The existing weld inspection of LNG storage tanks is still mainly based on X-ray film imaging technology, but the film imaging efficiency is low and the labor intensity is high, which makes it difficult to meet the construction period requirements. In addition, the long-term storage of X-ray film will cause the image to discolor or fade, making it impossible to verify the original inspection results with the film; 2. Since the side walls of the LNG storage tank are relatively high and the welds are both horizontal and vertical, the current method is to use two hoists to fix the radiation source and the detector respectively. The vertical weld of the LNG storage tank is inspected by lifting the hoist longitudinally, and the horizontal weld of the LNG storage tank is inspected by moving the hoist horizontally. This detection method makes it impossible for the radiation source and the detector to move synchronously accurately, which seriously affects the detection accuracy of the welds of the LNG storage tank. Summary of the invention

[0004] The present invention provides a DR imaging detection device for LNG storage tanks. A walking mechanism is designed on a mounting frame, and a first guide rail and a second guide rail are also designed on the mounting frame. Through the coordinated operation of the walking mechanism, the first guide rail, the second guide rail and the winch mechanism, the horizontal and vertical movement detection operations of the DR imaging mechanism can be realized.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A DR imaging detection device for an LNG storage tank comprises a mounting frame and a remote controller, wherein the mounting frame is provided with a controller, a walking mechanism and a DR imaging mechanism, wherein a first guide rail and a second guide rail arranged downward are respectively provided on both sides of the mounting frame, wherein a first mounting platform which can slide up and down is provided on the first guide rail, wherein a second mounting platform which can slide up and down is provided on the second guide rail, wherein an X-ray machine of the DR imaging mechanism is installed on a first mounting platform of the first guide rail, and a detector of the DR imaging mechanism is installed on a second mounting platform of the second guide rail; wherein the walking mechanism comprises a driving motor, a driving wheel and two driven wheels, wherein the driving wheel and the two driven wheels are arranged at the bottom of the mounting frame in a straight line direction, the driving motor is arranged at the side of the mounting frame, and the driving motor drives the driving wheel to rotate through a transmission belt; wherein a winch mechanism is also provided at the top of the mounting frame, wherein the winch mechanism comprises a motor and a rotating shaft, wherein two synchronous belts are arranged on the rotating shaft, and the two synchronous belts are respectively connected to the first mounting platform and the second mounting platform, and wherein the motor of the winch mechanism can drive the first mounting platform and the second mounting platform to move synchronously when the motor of the winch mechanism is in motion; wherein the remote controller is wirelessly connected to the controller on the mounting frame through a router, and the controller is respectively connected to the DR imaging mechanism, the driving motor and the winch mechanism through control lines.

[0007] The first guide rail and the second guide rail have the same appearance and structure. The first guide rail is spliced ​​by a plurality of connecting frames. The outer side of the first guide rail is provided with a slide groove, and the first mounting platform is slidably set on the slide groove. The outer side of the second guide rail is provided with a slide groove, and the second mounting platform is slidably set on the slide groove.

[0008] The inner side surfaces of the first guide rail and the second guide rail are respectively provided with a plurality of support and limit rods in the horizontal direction, and the ends of the support and limit rods are provided with universal rollers.

[0009] The support limit rod is a shock absorbing rod or an electric push rod.

[0010] The second mounting platform includes a mounting panel and a first servo motor, the first servo motor is mounted on the bottom of the mounting panel, a screw is coaxially arranged on the main shaft of the first servo motor, a slide groove is arranged on the top surface of the mounting panel, a slider is arranged in the slide groove, a downwardly arranged transmission plate is arranged at the bottom of the slider, a threaded hole is arranged on the transmission plate, the screw on the main shaft of the servo motor is threadedly connected with the threaded hole of the transmission plate, a horizontally arranged mounting plate is arranged on the top of the slider, a motor mounting frame is arranged on the side of the mounting plate, a second servo motor is arranged on the motor mounting frame, a fixing frame is arranged on the main shaft of the second servo motor, and the detector is installed on the fixing frame.

[0011] The installation panel is also provided with a support rod, and the lower bottom surface at the middle position of the installation plate is slidably supported and connected with the top surface of the support rod.

[0012] A centrifugal fan is respectively disposed at the bottom of the first guide rail and the bottom of the second guide rail.

[0013] The bottom of the mounting frame is provided with four downwardly disposed protection rods.

[0014] By adopting the above technical solution, the beneficial effects of the present invention are:

[0015] In order to realize the automatic detection of the circumferential weld of the inner tank wall of the LNG storage tank, a walking mechanism is designed on the mounting frame. The walking mechanism consists of a driving motor, a driving wheel and two driven wheels. The curvature of the inner tank wall of the LNG storage tank is close to zero, so the influence of the curvature on the walking mechanism can be ignored. During the detection, a driving wheel and two driven wheels of the walking mechanism are placed on the tank wall. The driving motor drives the rotation of the driving wheel to drive the mounting frame to move on the inner tank wall of the LNG storage tank, thereby realizing the horizontal movement detection operation of the DR imaging mechanism;

[0016] In order to realize the automatic detection of the longitudinal weld of the inner tank wall of the LNG storage tank, the first guide rail and the second guide rail are designed on the mounting frame, and the X-ray machine and the detector are placed on the first guide rail and the second guide rail respectively. The hoisting mechanism drives the first mounting platform and the second mounting platform to rise and fall through two synchronous belts, so that the X-ray machine and the detector are synchronously raised and lowered along the longitudinal direction on the first guide rail and the second guide rail respectively, thereby realizing the longitudinal mobile detection operation of the DR imaging mechanism;

[0017] The remote controller establishes a wireless local area network through a router, and the remote controller controls the controller on the mounting frame through wireless connection to perform command operations. The flaw detection images generated by the DR imaging flaw detection device are also transmitted back to the remote controller through the wireless local area network. The remote controller in the present invention adopts a portable computer, and the flaw detection images generated by the DR imaging flaw detection device are finally transmitted back to the portable computer. The staff can realize the operation of the DR imaging flaw detection device and the real-time return storage and image review operations of the flaw detection images through remote control;

[0018] The second servo motor can drive the fixed frame to rotate 90° in the forward direction or 90° in the reverse direction, thereby driving the detector to rotate synchronously to ensure the uniformity of the size of the collected image; the first servo motor can drive the slider to slide back and forth on the slide slot. While controlling the detector surface not to touch the tank wall, the distance from the tank wall is as small as possible, thereby reducing geometric unsharpness and achieving the best detection effect of the detection image.

[0019] In summary, the present invention provides a DR imaging detection device for LNG storage tanks, a traveling mechanism is designed on the mounting frame, and a first guide rail and a second guide rail are designed on the mounting frame. Through the coordinated operation of the traveling mechanism, the first guide rail, the second guide rail and the winch mechanism, the horizontal and vertical mobile detection operations of the DR imaging mechanism can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 for Figure 1 A top view of

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 4 It is a partial structural schematic diagram of the second mounting platform in the present invention;

[0024] Figure 5 It is a structural schematic diagram of the mounting frame in the present invention;

[0025] Figure 6 for Figure 5 Left view of;

[0026] Figure 7 It is a schematic diagram of the working principle of the present invention;

[0027] Figure 8 Schematic diagram of the retractable guide rail in the present invention Figure 1 ;

[0028] Fig. 9 Schematic diagram of the retractable guide rail in the present invention Figure 2 ;

[0029] Fig.10 for Fig. 9 The structural diagram of the middle winding device;

[0030] Fig.11 for Fig.10 Top view of the middle take-up reel.

[0031] Mounting frame 1, first guide rail 2, second guide rail 3, first mounting platform 4, second mounting platform 5, X-ray machine 6, detector 7, drive motor 8, active wheel 9, driven wheel 10, rotating shaft 11, synchronous belt 12, auxiliary platform 13, support limit rod 14, universal roller 15, counterweight 16, first servo motor 17, slide groove 18, slider 19, mounting plate 20, second servo motor 21, fixed frame 22, support rod 23, centrifugal fan 24, protection rod 25, fixed sleeve 26, telescopic frame 27, latch 28, mounting rod 29, motor 30, fixed disk 31, winding disk 32, winding shaft 33, insertion rod 34. DETAILED DESCRIPTION

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The following will be combined with the drawings in the embodiments of the invention to clearly and completely describe the technical solutions in the embodiments of the invention. Obviously, the described embodiments are only part of the embodiments of the invention, not all of the embodiments. Based on the embodiments of the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0034] like Figure 1-Figure 7 As shown; a DR imaging detection device for LNG storage tanks comprises a mounting frame 1 and a remote controller, the mounting frame 1 is provided with a protective shell, the mounting frame 1 is provided with a controller, a walking mechanism and a DR imaging mechanism, the mounting frame 1 is provided with a first guide rail 2 and a second guide rail 3 arranged downwards on both sides, the first guide rail 2 is provided with a first mounting platform 4 that can slide up and down, the second guide rail 3 is provided with a second mounting platform 5 that can slide up and down, an X-ray machine 6 of the DR imaging mechanism is installed on the first mounting platform 4 of the first guide rail 2, and a detector 7 of the DR imaging mechanism is installed on the second mounting platform 5 of the second guide rail 3; the walking mechanism comprises a driving motor 8, a driving wheel 9 and two driven wheels 10, the driving wheel 9 and two driven wheels 10 are arranged at the bottom of the mounting frame 1 in a straight line direction, the driving motor 8 is arranged at the side of the mounting frame 1, and the driving motor 8 drives the driving wheel 9 to rotate through the transmission belt; the top of the mounting frame 1 is also provided with a hoisting mechanism, the hoisting mechanism includes a motor and a rotating shaft 11, and two synchronous belts 12 are arranged on the rotating shaft 11, and the two synchronous belts 12 are respectively connected to the first mounting platform 4 and the second mounting platform 5. When the motor of the hoisting mechanism is in motion, it can drive the first mounting platform 4 and the second mounting platform 5 to move synchronously; the remote control is wirelessly connected to the controller on the mounting frame 1 through the router, and the controller is respectively connected to the DR imaging mechanism, the driving motor 8 and the hoisting mechanism through the control line. An auxiliary table 13 is arranged at the bottom of the first guide rail 2, and the host of the DR imaging mechanism is installed on the auxiliary table 13.

[0035] The main shaft of the driving motor 8 is connected to the reducer, and the output shaft of the reducer drives the driving wheel 9 to rotate through a transmission chain.

[0036] The first guide rail 2 and the second guide rail 3 have the same appearance and structure. The first guide rail 2 is spliced ​​by a number of connecting frames. The outer side of the first guide rail 2 is provided with a slide groove, and the first mounting platform 4 is slidably set on the slide groove. The outer side of the second guide rail 3 is provided with a slide groove, and the second mounting platform 5 is slidably set on the slide groove.

[0037] like Figure 8-Figure 11 As shown, the first guide rail 2 and the second guide rail 3 can also be set as a retractable structure according to the working requirements. The first guide rail 2 of the retractable structure includes a fixed sleeve 26 and a telescopic frame 27. The telescopic frame 27 is plugged into the fixed sleeve 26. A positioning hole is provided on the lower side of the fixed sleeve 26. A latch 28 is plugged into the positioning hole. The telescopic frame 27 is provided with a row of evenly arranged snap-in holes; a winding device is also provided on the fixed sleeve 26. The winding device includes a mounting rod 29, a motor 30, a fixed disk 31 and a winding disk 32. Two parallel sliding grooves are provided on the fixed sleeve 26. The mounting rod 29 is slidably arranged Between the two slide grooves, the motor 30 is fixed at the middle position of the mounting rod 29, the center point of the fixed disk 31 is fixedly connected to the main shaft of the motor 30, two holes are arranged on the fixed disk 31, a winding shaft 33 is arranged at the center position of the winding disk 32, and two plug rods 34 are also arranged on the winding disk 32, and the two plug rods 34 on the winding disk 32 are plugged into and matched with the two holes on the fixed disk 31; the winding shaft 33 is a magnetic winding shaft 33, and when a retractable first guide rail 2 and a second guide rail 3 are adopted, the first mounting platform 4 and the second mounting platform 5 are respectively fixed on the synchronous belts of the first guide rail 2 and the second guide rail 3.

[0038] Because the guide rails are particularly long, it is difficult to control the entire device when it is hoisted onto the tank wall, and the two guide rails are easy to touch the tank wall. Therefore, before hoisting, the two guide rails can be retracted. The method is to plug the reel 32 into the fixed disk 31, and the two synchronous belts are respectively inserted between the two insertion rods 34 and the reel shaft 33. The motor 30 drives the fixed disk 31 and the reel 32 to rotate, and the synchronous belt is reeled. While reeling the synchronous belt, the telescopic frame 27 is pulled up, and the mounting rod 29 slides upward between the two parallel slide grooves of the fixed sleeve 26, and the telescopic frame 27 is received on the fixed sleeve 26. The fixed sleeve 26 and the telescopic frame 27 are fixed together using the latch 28 to complete the retraction operation of the first guide rail 2;

[0039] When the first guide rail 2 of the retractable structure needs to be unfolded, the latch 28 between the fixed sleeve 26 and the telescopic frame 27 is pulled out, the motor 30 is driven to drive the fixed disk 31 and the winding disk 32 to rotate, the synchronous belt is released, and the telescopic frame 27 moves downward by its own weight. When the telescopic frame 27 is fully unfolded, the fixed sleeve 26 and the telescopic frame 27 are fixed by the latch 28, and the winding disk 32 is removed to complete the unfolding operation of the first guide rail 2.

[0040] The inner side surfaces of the first guide rail 2 and the second guide rail 3 are respectively provided with a plurality of support limit rods 14 in the horizontal direction, and the ends of the support limit rods 14 are provided with universal rollers 15. The bottoms of the first guide rail 2 and the second guide rail 3 are respectively provided with detachable counterweights 16, which can increase the stability of the first guide rail 2 and the second guide rail 3 when moving.

[0041] The support limit rod 14 is a damping rod or an electric push rod. When the damping rod is used, the swing amplitude of the first guide rail 2 and the second guide rail 3 during movement can be reduced; when the electric push rod is used, it can be controlled by a controller to perform telescopic movements, thereby adjusting the distance between the first guide rail 2, the second guide rail 3 and the inner wall of the storage tank.

[0042] The second mounting platform 5 includes a mounting panel and a first servo motor 17. The first servo motor 17 is mounted on the bottom of the mounting panel. A screw is coaxially arranged on the main shaft of the first servo motor 17. A slide groove 18 is arranged on the top surface of the mounting panel. A slider 19 is arranged in the slide groove 18. A downwardly arranged transmission plate is arranged at the bottom of the slider 19. A threaded hole is arranged on the transmission plate. The screw on the main shaft of the servo motor is threadedly connected with the threaded hole of the transmission plate. A horizontally arranged mounting plate 20 is arranged on the top of the slider 19. A motor mounting frame is arranged on the side of the mounting plate 20. A second servo motor 21 is arranged on the motor mounting frame. A fixing frame 22 is arranged on the main shaft of the second servo motor 21. The detector 7 is mounted on the fixing frame 22.

[0043] A support rod 23 is also provided on the installation panel, and the lower bottom surface of the middle position of the installation plate 20 is slidably supported and connected to the top surface of the support rod 23.

[0044] A centrifugal fan 24 is respectively provided at the bottom of the first guide rail 2 and the second guide rail 3. When the first guide rail 2 and the second guide rail 3 are in operation, they are easily disturbed by external factors such as cyclones and airflows. At this time, it is only necessary to turn on the centrifugal fan 24 through the controller. The operation of the centrifugal fan 24 causes the first guide rail 2 and the second guide rail 3 to generate an inward thrust, so that the first guide rail 2 and the second guide rail 3 are stably attached to the tank wall for DR imaging operations.

[0045] The bottom of the mounting frame 1 is provided with four downwardly disposed protection rods 25. When the DR imaging flaw detection device derails due to an accident, the four downwardly disposed protection rods 25 can protect the DR imaging flaw detection device from being stuck on the top of the tank wall, thereby preventing the DR imaging flaw detection device from crashing.

[0046] By adopting the above technical solution, the method of using the present invention is:

[0047] Before use, first connect the controller of the DR imaging flaw detection device to the wireless LAN set by the remote control, so that the remote control can remotely and wirelessly control the DR imaging flaw detection device to operate. Use a crane to stably place the DR imaging flaw detection device on the inner tank wall of the LNG storage tank. The DR imaging flaw detection device can use a built-in power supply or an external power supply. After it is stably placed, the staff can send instructions to the DR imaging flaw detection device through the remote control. After receiving the instructions, the DR imaging flaw detection device can perform horizontal and vertical mobile detection operations of the LNG storage tank.

[0048] By adopting the above technical solution, the beneficial effects of the present invention are:

[0049] In order to realize the automatic detection of the circumferential weld of the inner tank wall of the LNG storage tank, a walking mechanism is designed on the mounting frame 1. The walking mechanism consists of a driving motor 8, a driving wheel 9 and two driven wheels 10. The curvature of the inner tank wall of the LNG storage tank is close to zero, so the influence of the curvature on the walking mechanism can be ignored. During the detection, a driving wheel 9 and two driven wheels 10 of the walking mechanism are placed on the tank wall. The driving motor 8 drives the driving wheel 9 to rotate, which can drive the mounting frame 1 to move on the inner tank wall of the LNG storage tank, thereby realizing the horizontal movement detection operation of the DR imaging mechanism;

[0050] In order to realize the automatic detection of the longitudinal weld of the inner tank wall of the LNG storage tank, the first guide rail 2 and the second guide rail 3 are designed on the mounting frame 1, and the X-ray machine 6 and the detector 7 are respectively placed on the first guide rail 2 and the second guide rail 3. The hoisting mechanism drives the first mounting platform 4 and the second mounting platform 5 to rise and fall through two synchronous belts 12, so that the X-ray machine 6 and the detector 7 are respectively raised and lowered synchronously on the first guide rail 2 and the second guide rail 3 in the longitudinal direction, thereby realizing the longitudinal movement detection operation of the DR imaging mechanism;

[0051] The remote controller establishes a wireless local area network through a router, and the remote controller controls the controller on the mounting frame 1 through wireless connection to perform command operations. The flaw detection images generated by the DR imaging flaw detection device are also transmitted back to the remote controller through the wireless local area network. The remote controller in the present invention adopts a portable computer, and the flaw detection images generated by the DR imaging flaw detection device are finally transmitted back to the portable computer. The staff can realize the operation of the DR imaging flaw detection device and the real-time return storage and image review operations of the flaw detection images through remote control;

[0052] The second servo motor 21 can drive the fixing frame 22 to rotate 90° in the forward direction or 90° in the reverse direction, thereby driving the detector 7 to rotate synchronously to ensure the uniformity of the size of the collected image; the first servo motor 17 can drive the slider 19 to slide back and forth on the slide groove 18. Since the detector surface is controlled not to touch the tank wall, the distance from the tank wall is as small as possible, thereby reducing the geometric unsharpness, so that the detection image can achieve the best detection effect, so that the detection image can achieve the best detection effect; the detector 7 is also provided with a laser ranging device, which can accurately control the distance between the detector 7 and the tank wall, and can also avoid collision between the detector 7 and the tank wall.

[0053] In summary, the present invention provides a DR imaging detection device for LNG storage tanks, a walking mechanism is designed on the mounting frame 1, and a first guide rail 2 and a second guide rail 3 are also designed on the mounting frame 1. Through the cooperation of the walking mechanism, the first guide rail 2, the second guide rail 3 and the winch mechanism, the horizontal and vertical mobile detection operations of the DR imaging mechanism can be realized.

[0054] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A DR imaging detection device for LNG storage tanks, comprising a mounting frame and a remote controller, wherein the mounting frame is provided with a controller, a walking mechanism and a DR imaging mechanism, and wherein: A first guide rail and a second guide rail are respectively arranged downwardly on both sides of the mounting frame, a first mounting platform which can slide up and down is arranged on the first guide rail, and a second mounting platform which can slide up and down is arranged on the second guide rail, the X-ray machine of the DR imaging mechanism is mounted on the first mounting platform of the first guide rail, and the detector of the DR imaging mechanism is mounted on the second mounting platform of the second guide rail; the walking mechanism includes a driving motor, a driving wheel and two driven wheels, the driving wheel and the two driven wheels are arranged at the bottom of the mounting frame in a straight line direction, the driving motor is arranged at the side of the mounting frame, and the driving motor drives the driving wheel to rotate through a transmission belt; a winch mechanism is also arranged on the top of the mounting frame, the winch mechanism includes a motor and a rotating shaft, and a rotating shaft is provided There are two synchronous belts, which are connected to the first mounting platform and the second mounting platform respectively. When the motor of the hoisting mechanism is in motion, the first mounting platform and the second mounting platform can be driven to move synchronously. The remote control is wirelessly connected to the controller on the mounting frame through a router, and the controller is connected to the DR imaging mechanism, the driving motor and the hoisting mechanism through control lines. The inner side surfaces of the first guide rail and the second guide rail are respectively provided with a plurality of support limit rods in the horizontal direction, and the ends of the support limit rods are provided with universal rollers. A centrifugal fan is provided at the bottom of the first guide rail and the bottom of the second guide rail respectively. The first guide rail and the second guide rail are arranged to be a retractable structure, the first guide rail comprises a fixed sleeve and a telescopic frame, the telescopic frame is plugged into the fixed sleeve, a positioning hole is arranged on the lower side of the fixed sleeve, a latch is plugged into the positioning hole, and a row of evenly arranged clamping holes is arranged on the telescopic frame; a winding device is also arranged on the fixed sleeve, the winding device comprises a mounting rod, a motor, a fixed disk and a winding disk, two parallel sliding grooves are arranged on the fixed sleeve, the mounting rod is slidably arranged between the two sliding grooves, the motor is fixed at the middle position of the mounting rod, the center point of the fixed disk is fixedly connected to the main shaft of the motor, two holes are arranged on the fixed disk, a winding shaft is arranged at the center position of the winding disk, and two plugging rods are also arranged on the winding disk, and the two plugging rods on the winding disk are plugged and matched with the two holes on the fixed disk.

2. The DR imaging detection device for LNG storage tanks according to claim 1 is characterized in that: The first guide rail and the second guide rail have the same appearance and structure. The first guide rail is spliced ​​by a plurality of connecting frames. The outer side of the first guide rail is provided with a slide groove, and the first mounting platform is slidably set on the slide groove. The outer side of the second guide rail is provided with a slide groove, and the second mounting platform is slidably set on the slide groove.

3. The DR imaging detection device for LNG storage tanks according to claim 1 is characterized in that: The support limit rod is a shock absorbing rod or an electric push rod.

4. The DR imaging detection device for LNG storage tanks according to claim 3 is characterized in that: The second mounting platform includes a mounting panel and a first servo motor, the first servo motor is mounted on the bottom of the mounting panel, a screw is coaxially arranged on the main shaft of the first servo motor, a slide groove is arranged on the top surface of the mounting panel, a slider is arranged in the slide groove, a downwardly arranged transmission plate is arranged at the bottom of the slider, a threaded hole is arranged on the transmission plate, the screw on the main shaft of the servo motor is threadedly connected with the threaded hole of the transmission plate, a horizontally arranged mounting plate is arranged on the top of the slider, a motor mounting frame is arranged on the side of the mounting plate, a second servo motor is arranged on the motor mounting frame, a fixing frame is arranged on the main shaft of the second servo motor, and the detector is installed on the fixing frame.

5. The DR imaging detection device for LNG storage tanks according to claim 4 is characterized in that: The installation panel is also provided with a support rod, and the lower bottom surface at the middle position of the installation plate is slidably supported and connected with the top surface of the support rod.

6. The DR imaging detection device for LNG storage tanks according to claim 1, characterized in that: The bottom of the mounting frame is provided with four downwardly disposed protection rods.

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