A pressure vessel inner surface crack detection device and method thereof

Abstract

The present invention belongs to the technical field of pressure vessels, and in particular, is a device for detecting cracks on the inner surface of a pressure vessel, comprising a support platform, a sliding groove is provided on the upper curved surface array of the support platform, a rotating hole is provided on the side of the support platform, the upper curved surface of the support platform is slidably connected to the pressure vessel, a rotating mechanism is provided on one side of the support platform, a winding mechanism is provided on the other side of the support platform, the winding mechanism includes a connecting cable, and a detection mechanism is provided on the upper end of the winding mechanism. The detection device, by providing a detection mechanism, can effectively bring the ultrasonic flaw detector at the end of the sticking rod into the interior of the pressure vessel, the design of the sticking rod reduces the occupied space of the entire detection mechanism, the rotating pan-tilt drives the ultrasonic flaw detector to detect in different directions, increasing the coverage and angle of the detection, and the limiting mechanism enables the sticking rod to perform efficient and accurate detection of the inner walls of different pressure vessels.

Description

Technical Field

[0001] The invention relates to the technical field of pressure vessels, and in particular to a device for detecting cracks on the inner surface of a pressure vessel. Background Art

[0002] A pressure vessel is a closed device that carries a certain pressure and is mainly used to contain gas or liquid. These devices play an important role in industry, civil, military and other fields as well as in scientific research. Pressure vessels are widely used, especially in the chemical and petrochemical industries. They are mainly used in heat transfer, mass transfer, reaction and other process, as well as storage and transportation of pressurized gas or liquefied gas. In addition, they are also widely used in other industrial and civil fields. For example, various special compressors for air compressors and auxiliary machines for refrigeration compressors are pressure vessels. A qualified pressure vessel cannot be separated from various tests, including crack detection on its inner surface.

[0003] Upon inquiry, the patent publication number CN117589794A on the Chinese Patent Network is a new material boiler pressure vessel inner surface crack detection device and detection method. The detection device completes the crack detection inside the pressure vessel through the walking mechanism, the marking mechanism and the positioning mechanism inside the pressure vessel. However, the detection device is installed inside the pressure vessel, which occupies a large space. The installation and disassembly are relatively complicated, time-consuming and labor-intensive, and it is impossible to perform assembly line-like detection work, and it is impossible for the complete detection device to freely enter and exit the pressure vessel.

[0004] In view of the above problems, the present invention proposes a device for detecting cracks on the inner surface of a pressure vessel. Summary of the invention

[0005] Based on the existing pressure vessel detection technology problems, the present invention proposes a pressure vessel inner surface crack detection device and method.

[0006] The present invention proposes a pressure vessel inner surface crack detection device, comprising a support platform, an upper curved surface array of the support platform is provided with a slide groove, a side surface of the support platform is provided with a rotating hole, the upper curved surface of the support platform is slidably connected to the pressure vessel, a rotating mechanism is provided on one side of the support platform, a winding mechanism is provided on the other side of the support platform, the winding mechanism includes a connecting cable, and a detection mechanism is provided on the upper end of the winding mechanism.

[0007] The rotating mechanism realizes the rotating action of the pressure container.

[0008] The wire winding mechanism realizes the retracting and releasing action of the connecting cable.

[0009] The detection mechanism realizes the detection action of the inner wall of the pressure container.

[0010] Preferably, the rotating mechanism includes a placing table, the upper end of the placing table is fixedly connected to the first motor, the end of the output shaft of the first motor is fixedly connected to the first gear, the surface of the first gear is meshed with a first gear belt, the other end of the first gear belt is meshed with a second gear, one side of the second gear is rotatably connected to the inner wall of the rotating hole through a connecting rod and a bearing, a rotating gear is provided in the groove surface of each slide groove, the two ends of the rotating gear are respectively rotatably connected to the groove surface of the slide groove, and one end of the rotating gear is fixedly connected to one end of the connecting rod to which the side surface of the second gear is fixedly connected, first roller shafts are symmetrically provided on both sides of the rotating gear, the groove surface of the slide groove between the first roller shaft and the rotating gear is staggered and rotatably connected with the second roller shaft, and the surface of the rotating gear is meshed with a second gear belt.

[0011] Preferably, the second roller shaft is arranged outside the second gear belt, the outer surface of the second gear belt is slidably connected to the surface of the second roller shaft, and the inner surface of the second gear belt is slidably connected to the surface of the first roller shaft.

[0012] Preferably, the wire winding mechanism also includes a support tube, a second motor is arranged inside the support tube, the upper end of the support tube is fixedly connected to a limiting ring, the inner wall of the limiting ring is rotatably connected to a placement plate, the lower surface of the placement plate is fixedly connected to the output shaft of the second motor via a coupling, the connecting cable is wound on the upper surface of the placement plate, and one end of the connecting cable passes through the side of the limiting ring and extends to the outside.

[0013] Preferably, the detection mechanism includes a collecting box, a fixed plate is provided inside the collecting box, a third motor is provided on one side of the fixed plate, the output shaft of the third motor is rotatably connected to the plate body of the fixed plate through a bearing, a rotating roller is provided on the other side of the fixed plate, one end of the rotating roller is fixedly connected to the inner ring of the bearing rotatably connected to the end of the output shaft of the third motor, the other end of the rotating roller is rotatably connected to the inner side surface of the collecting box through a bearing, a sticky rod is wound around the surface of the rotating roller, one end of the sticky rod is fixedly connected to a joint, and one end of the sticky rod passes through the side of the collecting box and extends to the interior of the pressure vessel.

[0014] Preferably, one end of the joint is fixedly connected to a rotating pan-tilt head, the outer side of the rotating pan-tilt head is fixedly connected to one end of the connecting cable, the surface of the rotating pan-tilt head is fixedly connected to an ultrasonic flaw detector, and the surface of the adhesive rod is movably sleeved with a limiting mechanism.

[0015] Preferably, the outer surface of the second gear belt at the position where the rotating gear and the first roller shaft are located protrudes from the surface of the sliding groove.

[0016] Preferably, the composite material of the sticky rod is a combination of carbon fiber, glass fiber and resin, the end of the sticky rod is cylindrical, and the two ends of the sticky rod are relatively rolled up along the transverse symmetry axis in the elongation direction of the sticky rod.

[0017] Preferably, a method for using a pressure vessel inner surface crack detection device comprises the following steps: step 1, placing the pressure vessel on the curved surface of a support platform by means of a lifting device, the first motor drives the first gear belt transmission, thereby driving the connecting rod fixedly connected to the second gear to rotate, the connecting rod drives the bearing embedded in the rotating hole to rotate, thereby driving the rotating gear fixedly connected to the inner ring of the bearing to rotate, the rotating gear then drives the second gear belt to transmit in the slide groove, the second gear belt drives the pressure vessel to rotate in the curved surface of the support platform, and the detection mechanism and the winding mechanism work synchronously;

[0018] Step 2: The second motor drives the rotating roller to rotate, and the sticking rod wrapped on the surface of the rotating roller extends outward, thereby driving the joint fixed to its end to move toward the side of the entrance of the pressure vessel. At the same time, the second motor drives the support plate rotatably connected to the limiting ring to rotate, and one end of the connecting cable moves toward the inside of the pressure vessel along with the rotating platform fixed on the surface of the joint under the action of the second limiting ring, until the ultrasonic flaw detector on the surface of the rotating platform enters the entrance of the pressure vessel, and the second motor and the third motor stop rotating;

[0019] Step 3. Connect the cables, power on the control pan / tilt, and drive the ultrasonic flaw detector to rotate and detect inside the pressure vessel. At this time, the pressure vessel continues to rotate under the action of the first motor. After the ultrasonic flaw detector detects one circle at the entrance of the pressure vessel, the second motor and the third motor continue to rotate, and the ultrasonic flaw detector continues to go deeper into the pressure vessel for detection.

[0020] Preferably, the limiting mechanism includes a connecting block, the outer side surface of each connecting block is fixedly connected to a telescopic ring, and multiple connecting blocks are connected to form a circle, the inner walls at both ends of the telescopic ring are respectively slidably connected to telescopic rods, and the opposite surfaces of the two telescopic rods are rotatably connected to back-to-back cylinders through a rotating shaft, the lower end of the connecting block is fixedly connected to a fixing rod, and one end of the fixing rod is fixedly connected to a second limiting ring.

[0021] The beneficial effects of the present invention are:

[0022] 1. By setting a rotating mechanism, the power of the motor is effectively transmitted to the pressure vessel to realize its rotation. The first roller shaft and the second roller shaft provide a limit for the second gear belt, while avoiding the problem of contact friction between the upper and lower parts of the second gear belt caused by the curved surface of the slide groove during transmission, thereby improving the service life of the second gear belt. At the same time, the existence of the second gear belt provides a rotation function for the pressure vessel.

[0023] 2. By setting up a wire winding mechanism, under the action of the second motor, the connecting cable is automatically unwound as the ultrasonic flaw detector goes deeper into the pressure vessel, and the ultrasonic flaw detector is automatically reeled in when it moves out of the pressure vessel, thereby effectively retracting and releasing the connecting cable to keep the cable neat and orderly. The use of the limit ring ensures the stability of the cable during the retraction and release process, avoiding cable confusion and entanglement.

[0024] 3. By setting up the detection mechanism, the rotating roller can be driven to rotate under the action of the third motor, so that the end of the sticking rod wrapped on the surface of the rotating roller moves outward, so that the ultrasonic flaw detector at the end of the sticking rod can be effectively brought into the pressure vessel. The design of the sticking rod reduces the space occupied by the entire detection mechanism and is also convenient for storage. The rotating pan-tilt table drives the ultrasonic flaw detector to detect in different directions, increasing the coverage and angle of the detection. The limiting mechanism limits the width of the sticking rod opening outward, so that the maximum width of the sticking rod entering the pressure vessel is the same as the inner diameter length at the entrance of the pressure vessel, thereby realizing efficient and accurate detection of the inner walls of different pressure vessels, adapting to different entrance diameters of pressure vessels, and improving the practicality of the detection mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of a pressure vessel inner surface crack detection device proposed by the present invention;

[0026] Figure 2 A three-dimensional diagram of a support platform of a pressure vessel inner surface crack detection device proposed by the present invention;

[0027] Figure 3 A three-dimensional diagram of a second gear belt of a pressure vessel inner surface crack detection device proposed by the present invention;

[0028] Figure 4 A three-dimensional diagram of a wire winding mechanism of a pressure vessel inner surface crack detection device proposed by the present invention;

[0029] Figure 5 A three-dimensional diagram of a sticking rod of a pressure vessel inner surface crack detection device proposed by the present invention;

[0030] Figure 6A top view of a detection mechanism of a pressure vessel inner surface crack detection device proposed by the present invention;

[0031] Figure 7 A three-dimensional diagram of a limit mechanism of a pressure vessel inner surface crack detection device proposed by the present invention;

[0032] Figure 8 A three-dimensional diagram of a telescopic ring of a pressure vessel inner surface crack detection device proposed by the present invention;

[0033] Fig. 9 A diagram showing the relationship between the positions of the telescopic rods of a pressure vessel inner surface crack detection device proposed by the present invention;

[0034] Fig.10 This is a connection diagram of a telescopic rod and a back-to-back cylinder of a pressure vessel inner surface crack detection device proposed by the present invention.

[0035] In the figure: 1. support table; 10. rotating hole; 11. slide; 2. pressure vessel; 3. rotating mechanism; 31. placing table; 32. first motor; 33. first gear belt; 34. second gear; 35. rotating gear; 36. first roller shaft; 37. second roller shaft; 38. second gear belt; 4. winding mechanism; 41. support tube; 42. second motor; 43. limiting ring; 44. connecting cable; 5. detection mechanism; 50. collecting box; 51. fixing plate; 52. third motor; 53. rotating roller; 54. sticking rod; 55. joint; 56. rotating pan-tilt head; 57. ultrasonic flaw detector; 58. limiting mechanism; 581. connecting block; 582. telescopic ring; 583. telescopic rod; 584. back-to-back cylinder; 59. fixing rod; 510. second limiting ring. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] Reference Figure 1-Figure 10 A device for detecting cracks on the inner surface of a pressure vessel comprises a support platform 1, a slide groove 11 is provided on the upper curved surface array of the support platform 1, a rotating hole 10 is provided on the side of the support platform 1, a pressure vessel 2 is slidably connected to the upper curved surface of the support platform 1, a rotating mechanism 3 is provided on one side of the support platform 1, a winding mechanism 4 is provided on the other side of the support platform 1, the winding mechanism 4 comprises a connecting cable 44, and a detection mechanism 5 is provided on the upper end of the winding mechanism 4.

[0038] In order to realize the rotation action of the rotating mechanism 3 on the pressure vessel 2, the rotating mechanism 3 is provided to include a placing table 31, the upper end of the placing table 31 is fixedly connected to the first motor 32, the end of the output shaft of the first motor 32 is fixedly connected to the first gear, the surface of the first gear is meshed with a first gear belt 33, the other end of the first gear belt 33 is meshed with a second gear 34, one side of the second gear 34 is rotatably connected to the inner wall of the rotating hole 10 through a connecting rod and a bearing, and a rotating gear 35 is provided in the groove surface of each slide groove 11, the two ends of the rotating gear 35 are respectively rotatably connected to the groove surface of the slide groove 11, and one end of the rotating gear 35 is fixedly connected to one end of the connecting rod to which the side of the second gear 34 is fixedly connected, and first roller shafts 36 are symmetrically provided on both sides of the rotating gear 35, and the groove surface of the slide groove 11 between the first roller shaft 36 and the rotating gear 35 is staggered and rotatably connected with the second roller shaft 37, and the surface of the rotating gear 35 is meshed with a second gear belt 38.

[0039] Specifically, through the above structure, the first motor 32 drives the second gear 34 to rotate, further drives the rotating gear 35 to rotate, thereby driving the second gear belt 38 to rotate in the slide groove 11, and then drives the pressure vessel 2 to rotate in the curved surface of the support platform 1.

[0040] The second roller shaft 37 is arranged outside the second gear belt 38 , the outer surface of the second gear belt 38 is slidably connected to the surface of the second roller shaft 37 , and the inner surface of the second gear belt 38 is slidably connected to the surface of the first roller shaft 36 .

[0041] Specifically implemented in this way, through the above structure, the first roller shaft 36 and the second roller shaft 37 provide a limit for the second gear belt 38, while avoiding the problem of contact friction between the upper and lower parts of the second gear belt 38 during transmission due to the curved surface of the slide groove 11, thereby increasing the service life of the second gear belt 38. At the same time, the existence of the second gear belt 38 provides a rotation function for the pressure vessel 2.

[0042] In order to realize the retracting and releasing action of the winding mechanism 4 on the connecting cable 44, the winding mechanism 4 also includes a support tube 41, and a second motor 42 is arranged inside the support tube 41. The upper end of the support tube 41 is fixedly connected to a limiting ring 43, and the inner wall of the limiting ring 43 is rotatably connected to a placing plate. The lower surface of the placing plate is fixedly connected to the output shaft of the second motor 42 through a coupling. The connecting cable 44 is wound on the upper surface of the placing plate, and one end of the connecting cable 44 passes through the side of the limiting ring 43 and extends to the outside.

[0043] Specifically, through the above-mentioned structure, under the action of the second motor 42, the connecting cable 44 is automatically released as the ultrasonic flaw detector 57 penetrates into the pressure vessel 2, and the ultrasonic flaw detector 57 is automatically reeled in when it moves out of the pressure vessel 2, thereby effectively retracting and releasing the connecting cable 44, keeping the cable neat and orderly. The use of the limit ring 43 ensures the stability of the cable during the retraction and release process, avoiding confusion and entanglement of the cable.

[0044] In order to realize the detection action of the detection mechanism 5 on the inner wall of the pressure vessel 2, the detection mechanism 5 is provided to include a collecting box 50, a fixed plate 51 is provided inside the collecting box 50, a third motor 52 is provided on one side of the fixed plate 51, the output shaft of the third motor 52 is rotatably connected to the plate body of the fixed plate 51 through a bearing, a rotating roller 53 is provided on the other side of the fixed plate 51, one end of the rotating roller 53 is fixedly connected to the inner ring of the bearing rotatably connected to the end of the output shaft of the third motor 52, the other end of the rotating roller 53 is rotatably connected to the inner side surface of the collecting box 50 through a bearing, a sticky rod 54 is wound around the surface of the rotating roller 53, one end of the sticky rod 54 is fixedly connected to a joint 55, and one end of the sticky rod 54 passes through the side of the collecting box 50 and extends to the interior of the pressure vessel 2.

[0045] Specifically implemented in this way, through the above-mentioned structure, the rotating roller 53 can be driven to rotate under the action of the third motor 52, so that the end of the sticky rod 54 wrapped around the surface of the rotating roller 53 moves toward the outside, thereby effectively bringing the ultrasonic flaw detector 57 at the end of the sticky rod 54 into the pressure vessel 2. The design of the sticky rod 54 reduces the space occupied by the entire detection mechanism 5 and is also convenient for storage.

[0046] One end of the joint 55 is fixedly connected to a rotating platform 56 , the outer side of the rotating platform 56 is fixedly connected to one end of the connecting cable 44 , the surface of the rotating platform 56 is fixedly connected to an ultrasonic flaw detector 57 , and the surface of the adhesive rod 54 is movably sleeved with a limiting mechanism 58 .

[0047] Specifically, through the above structure, the rotating pan-tilt head 56 drives the ultrasonic flaw detector 57 to perform detection in different directions, thereby increasing the coverage and angle of detection. The limiting mechanism 58 limits the width of the sticking rod 54 opening outward, so that the maximum width of the sticking rod 54 that finally enters the pressure vessel 2 is the same as the inner diameter length at the entrance of the pressure vessel 2, thereby achieving efficient and accurate detection of the inner walls of different pressure vessels 2, and improving the practicality of the detection mechanism 5.

[0048] The outer surface of the second gear belt 38 where the rotating gear 35 and the first roller shaft 36 are located protrudes from the surface of the slide groove 11 .

[0049] Specifically, through the above structure, the second gear belt 38 protruding and exposed inside the slide groove 11 effectively drives the pressure vessel 2 to rotate on the curved surface of the support platform 1 under the rotation of the rotating gear 35, thereby improving the detection effect of the detection mechanism 5 on its inner wall.

[0050] The composite material of the bonding rod 54 is a combination of carbon fiber, glass fiber and resin. The above materials are formed into a final composite material through a specific manufacturing process. This material can have extremely high strength and rigidity while maintaining lightness and flexibility.

[0051] The ends of the sticking rod 54 are cylindrical, and the ends of the sticking rod 54 are relatively rolled up along the transverse symmetry axis in the elongation direction of the sticking rod 54.

[0052] Specifically, through the above structure, under the restriction of the limiting mechanism 58, the sticking rod 54 is changed from a flat rectangular parallelepiped to a cylindrical shape, thereby realizing the conversion of the sticking rod 54 between different shapes, thereby achieving the supporting effect for the ultrasonic flaw detector 57.

[0053] The limiting mechanism 58 includes a connecting block 581, and the outer side surface of each connecting block 581 is fixedly connected to a telescopic ring 582. The multiple connecting blocks 581 are connected to form a circle. The inner walls at both ends of the telescopic ring 582 are respectively slidably connected to telescopic rods 583. The opposite surfaces of the two telescopic rods 583 are rotatably connected to back-to-back cylinders 584 through a rotating shaft. The lower end of the connecting block 581 is fixedly connected to a fixing rod 59, and one end of the fixing rod 59 is fixedly connected to a second limiting ring 510.

[0054] Specifically implemented in this way, through the above structure, the back-to-back cylinder 584 can control the diameter of the circular through hole formed between the multiple connecting blocks 581, thereby achieving a limiting effect on the sticky rod 54 that passes through the circular through hole formed between the multiple connecting blocks 581, and at the same time providing an effective buffer zone for the sticky rod 54 to transform from a flat rectangular shape to a cylindrical shape, thereby achieving the sticky rod 54 under the control of the back-to-back cylinder 584. The diameter of the inlet of different types of pressure vessels 2 is improved, thereby improving the detection effect.

[0055] Reference Figure 1-Figure 10 , a method for using a pressure vessel inner surface crack detection device, the operating steps are as follows:

[0056] Step 1: Place the pressure vessel 2 on the curved surface of the support platform 1 by means of a lifting device. The first motor 32 drives the first gear belt 33 to transmit, thereby driving the connecting rod fixedly connected to the second gear 34 to rotate. The connecting rod drives the bearing embedded in the rotating hole 10 to rotate, thereby driving the rotating gear 35 fixedly connected to the inner ring of the bearing to rotate. The rotating gear 35 then drives the second gear belt 38 to transmit in the slide groove 11. The second gear belt 38 drives the pressure vessel 2 to rotate in the curved surface of the support platform 1. The detection mechanism 5 and the winding mechanism 4 work synchronously.

[0057] Step 2: The second motor 42 drives the rotating roller 53 to rotate, and the sticking rod 54 wound on the surface of the rotating roller 53 extends outward, thereby driving the joint 55 fixed to its end to move toward the side of the entrance of the pressure vessel 2. At the same time, the second motor 42 drives the support plate rotatably connected to the limiting ring 43 to rotate, and one end of the connecting cable 44 moves toward the inside of the pressure vessel 2 along with the rotating platform 56 fixed on the surface of the joint 55 under the action of the second limiting ring 510, until the ultrasonic flaw detector 57 on the surface of the rotating platform 56 enters the entrance of the pressure vessel 2, and the second motor 42 and the third motor 52 stop rotating;

[0058] Step three, the connecting cable 44 is energized to control the rotating pan-tilt head 56 to drive the ultrasonic flaw detector 57 to rotate and detect inside the pressure vessel 2. At this time, the pressure vessel 2 continues to rotate under the action of the first motor 32. After the ultrasonic flaw detector 57 detects one circle at the entrance of the pressure vessel 2, the second motor 42 and the third motor 52 continue to rotate, and the ultrasonic flaw detector 57 continues to penetrate into the pressure vessel 2 for detection.

[0059] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pressure vessel inner surface crack detection device, comprising a support platform (1), characterized in that: The upper curved surface array of the support platform (1) is provided with a slide groove (11), the side surface of the support platform (1) is provided with a rotation hole (10), the upper curved surface of the support platform (1) is slidably connected to a pressure vessel (2), a rotation mechanism (3) is provided on one side of the support platform (1), a winding mechanism (4) is provided on the other side of the support platform (1), the winding mechanism (4) comprises a connecting cable (44), and a detection mechanism (5) is provided on the upper end of the winding mechanism (4); The rotating mechanism (3) realizes a rotating action on the pressure container (2); The wire winding mechanism (4) realizes the retracting and releasing action of the connecting cable (44); The winding mechanism (4) further comprises a support tube (41), a second motor (42) is arranged inside the support tube (41), the upper end of the support tube (41) is fixedly connected to a limit ring (43), the inner wall of the limit ring (43) is rotatably connected to a placement plate, the lower surface of the placement plate is fixedly connected to the output shaft of the second motor (42) via a coupling, the connection cable (44) is wound on the upper surface of the placement plate, and one end of the connection cable (44) passes through the side of the limit ring (43) and extends to the outside; The detection mechanism (5) realizes the detection action of the inner wall of the pressure container (2); The detection mechanism (5) comprises a collection box (50), wherein a fixed plate (51) is arranged inside the collection box (50), a third motor (52) is arranged on one side of the fixed plate (51), an output shaft of the third motor (52) is rotatably connected to a plate body of the fixed plate (51) via a bearing, a rotating roller (53) is arranged on the other side of the fixed plate (51), one end of the rotating roller (53) is fixedly connected to an inner ring of a bearing rotatably connected to a terminal end of the output shaft of the third motor (52), the other end of the rotating roller (53) is rotatably connected to an inner side surface of the collection box (50) via a bearing, a sticking rod (54) is wound around the surface of the rotating roller (53), one end of the sticking rod (54) is fixedly connected to a joint (55), and one end of the sticking rod (54) passes through a side surface of the collection box (50) and extends to the inside of the pressure vessel (2); One end of the joint (55) is fixedly connected to a rotating platform (56), the outer side of the rotating platform (56) is fixedly connected to one end of the connecting cable (44), the surface of the rotating platform (56) is fixedly connected to an ultrasonic flaw detector (57), and the surface of the adhesive rod (54) is movably sleeved with a limiting mechanism (58); The composite material of the sticking rod (54) is a combination of carbon fiber, glass fiber and resin, the end of the sticking rod (54) is cylindrical, and the two ends of the sticking rod (54) are relatively rolled up along a transverse symmetry axis in the elongation direction of the sticking rod (54); The limiting mechanism (58) comprises a connecting block (581), the outer side surface of each connecting block (581) is fixedly connected to a telescopic ring (582), and a plurality of connecting blocks (581) are connected to form a circle, and the inner walls at both ends of the telescopic ring (582) are respectively slidably connected to telescopic rods (583), and the opposite surfaces of the two telescopic rods (583) are rotatably connected to back-to-back cylinders (584) via a rotating shaft, and the lower end of the connecting block (581) is fixedly connected to a fixed rod (59), and one end of the fixed rod (59) is fixedly connected to a second limiting ring (510).

2. A pressure vessel inner surface crack detection device according to claim 1, characterized in that: The rotating mechanism (3) comprises a placing table (31), the upper end of the placing table (31) is fixedly connected to a first motor (32), the end of the output shaft of the first motor (32) is fixedly connected to a first gear, the surface of the first gear is meshed with a first gear belt (33), the other end of the first gear belt (33) is meshed with a second gear (34), one side of the second gear (34) is rotatably connected to the inner wall of the rotating hole (10) through a connecting rod and a bearing, and a rotating gear (35) is arranged in the groove surface of each of the slide grooves (11). ), the two ends of the rotating gear (35) are respectively rotatably connected to the groove surface of the slide groove (11), and one end of the rotating gear (35) is fixedly connected to one end of a connecting rod to which the side of the second gear (34) is fixedly connected, first roller shafts (36) are symmetrically arranged on both sides of the rotating gear (35), and the groove surface of the slide groove (11) between the first roller shaft (36) and the rotating gear (35) is staggeredly rotatably connected with a second roller shaft (37), and the surface of the rotating gear (35) is meshed with a second gear belt (38).

3. A pressure vessel inner surface crack detection device according to claim 2, characterized in that: The second roller shaft (37) is arranged outside the second gear belt (38), the outer surface of the second gear belt (38) is slidably connected to the surface of the second roller shaft (37), and the inner surface of the second gear belt (38) is slidably connected to the surface of the first roller shaft (36).

4. A pressure vessel inner surface crack detection device according to claim 3, characterized in that: The outer surface of the second gear belt (38) at the position where the rotating gear (35) and the first roller shaft (36) are located protrudes from the surface of the sliding groove (11).

5. The method for using the pressure vessel inner surface crack detection device according to claim 4, characterized in that: The steps are as follows: Step 1: Place the pressure vessel (2) on the curved surface of the support platform (1) by means of a lifting device, and the first motor (32) drives the first gear belt (33) to transmit, thereby driving the connecting rod fixedly connected to the second gear (34) to rotate, and the connecting rod drives the bearing embedded in the rotating hole (10) to rotate, thereby driving the rotating gear 35 fixedly connected to the inner ring of the bearing to rotate, and the rotating gear (35) further drives the second gear belt (38) to transmit in the slide groove (11), and the second gear belt (38) drives the pressure vessel (2) to rotate in the curved surface of the support platform 1, and the detection mechanism (5) and the winding mechanism (4) work synchronously; Step 2: The third motor (52) drives the rotating roller (53) to rotate, and the sticking rod (54) wound on the surface of the rotating roller (53) extends outward, thereby driving the joint (55) fixed to the end thereof to move toward the entrance of the pressure vessel (2). At the same time, the second motor (42) drives the support plate rotatably connected to the limiting ring (43) to rotate, and one end of the connecting cable (44) moves toward the inside of the pressure vessel (2) along with the rotating platform (56) fixed on the surface of the joint (55) under the action of the second limiting ring (510), until the ultrasonic flaw detector (57) on the surface of the rotating platform (56) enters the entrance of the pressure vessel (2), and the second motor (42) and the third motor (52) stop rotating; Step 3: Connect the cable (44) and power on the rotating pan / tilt table (56) to drive the ultrasonic flaw detector (57) to rotate and detect inside the pressure vessel (2). At this time, the pressure vessel (2) continues to rotate under the action of the first motor (32). After the ultrasonic flaw detector (57) detects one circle at the entrance of the pressure vessel (2), the second motor (42) and the third motor (52) continue to rotate, and the ultrasonic flaw detector (57) continues to penetrate into the pressure vessel (2) for detection.

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