A spherical storage tank air tightness detection device

Abstract

The present invention discloses an air tightness detection device for a spherical storage tank, and relates to the technical field of pressure vessel detection equipment, including an electric docking arm facing the annular seam position of the spherical storage tank, an arc arm arranged in the electric docking arm, and a connecting arm connected to the central axis position of the electric docking arm, the electric docking arm can adjust the angle, and when the electric docking arm is adjusted from a horizontal distribution state to a vertical distribution state, the arc arm originally facing the annular seam position of the spherical storage tank is switched to a vertical seam position facing the spherical storage tank, and the connecting arm, the electric docking arm and the arc arm can move synchronously along the vertical seam direction of the spherical storage tank. The present invention can implement continuous and stable detection operations on the vertical seam, the annular seam and their intersection positions, and the detection range involved is relatively wide, and it is suitable for the structural characteristics of the intersection of the annular seam and the vertical seam of the spherical storage tank, which reduces the time required for manual movement detection, improves the stability of the detection operation, reduces the detection deviation, and improves the efficiency of the detection operation.

Description

Technical Field

[0001] The invention relates to the technical field of pressure vessel detection equipment, in particular to an air tightness detection equipment for a spherical storage tank. Background Art

[0002] Spherical storage tanks, also known as ball tanks, are a type of steel pressure vessel equipment. They are large-capacity, pressure-bearing spherical storage containers. This type of equipment is widely used in the petroleum refining industry, petrochemical industry, and liquefied product terminal storage, mainly for storing liquid or gaseous materials. Spherical storage tanks are mainly composed of spherical shells, supports, and auxiliary components. There are three types of spherical shell structures: single-layer, double-layer, and multi-layer. They are welded together from multiple spherical plates pre-pressed into a certain shape.

[0003] During the maintenance of spherical storage tanks, it is necessary to conduct air tightness testing. The main reason for air tightness testing of spherical tanks is to ensure that the spherical tanks can achieve reasonable structural integrity and reliability during normal use. Specifically, there are many factors that affect the safety of air tightness testing. For example, insufficient strength of equipment and pipelines may cause equipment to collapse and shell to collapse, and overpressure container explosion accidents may occur for pressure equipment. In addition, poor welding quality and cracking of welds during testing may cause medium leakage. Therefore, it is necessary to organize regular air tightness testing operations on spherical tanks.

[0004] Spherical storage tanks occupy a large area. During the process of conducting air tightness tests on their weld surfaces, scaffolding needs to be built to allow maintenance personnel to reach the designated location. In addition, since the spherical storage tank is welded from multiple spherical plates, multiple annular seams and vertical seams will be produced on the surface of the spherical storage tank, and the annular seams and vertical seams intersect. Therefore, it takes a long time and is difficult for staff to operate existing weld inspection equipment to conduct air tightness tests on welds. The stability of the inspection equipment cannot be guaranteed during the operation, and the inspection accuracy and efficiency cannot be improved. The present application provides an air tightness inspection device for spherical storage tanks to meet the needs. Summary of the invention

[0005] In view of the above problems, the present application provides an air tightness detection device for a spherical storage tank.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions: an air tightness detection device for a spherical storage tank, comprising an electric docking arm facing the annular seam position of the spherical storage tank, an arc arm arranged in the electric docking arm, and a connecting arm connected to the central axis position of the electric docking arm, wherein the electric docking arm can adjust the angle. When the electric docking arm is adjusted from a horizontal distribution state to a vertical distribution state, the arc arm originally facing the annular seam position of the spherical storage tank is switched to a vertical seam position facing the spherical storage tank, and the connecting arm, the electric docking arm and the arc arm can move synchronously along the vertical seam direction of the spherical storage tank.

[0007] The arc-shaped arm can move along the distribution track of the electric docking arm, and an electric rotating rod is arranged at one end of the arc-shaped arm, and a detection probe and a cleaning brush which can switch positions with the rotation of the electric rotating rod are arranged on the electric rotating rod.

[0008] Furthermore, a first tooth group distributed along an arc track is provided on one side of the arc arm away from the spherical storage tank, a first electric gear group is meshedly connected to the first tooth group, and a bracket that can carry the first electric gear group is provided in the electric docking arm.

[0009] Furthermore, the bracket is provided with a first connecting wheel group distributed along an arc trajectory, and the arc arm is provided with a guide channel for accommodating the first connecting wheel group to pass through. When the arc arm moves along the distribution trajectory of the electric docking arm, the relative position of the guide channel and the first connecting wheel group can be adjusted.

[0010] Furthermore, a second tooth set is provided on a side of the connecting arm away from the electric docking arm, and a second electric gear set is meshedly connected to the second tooth set.

[0011] The connecting arm is provided with a support arm outside, and the support arm is provided with a frame that can carry the second electric gear set. When the second electric gear set engages with the second tooth set and moves synchronously with the connecting arm along the vertical seam direction of the spherical storage tank, the electric docking arm and the arc arm move synchronously with it.

[0012] Furthermore, a traction track is provided on the frame, and a second connecting wheel group that passes through the traction track is provided on the connecting arm. When the second tooth group and the connecting arm move synchronously along the vertical seam direction of the spherical storage tank, the second connecting wheel group slides in the traction track.

[0013] Furthermore, the frame is provided with a support base, and the support base is provided with movable universal wheels.

[0014] Furthermore, the electric docking arm is provided with an upper and lower set of support frames, each of which is provided with a pair of follower arms moving in opposite directions, and the two follower arms located on the same side and distributed from top to bottom are connected by a follower shaft, and each follower shaft is provided with a pair of limiting wheels, and when the detection probe and the cleaning brush switch positions, the limiting wheels abut against the surface of the spherical storage tank.

[0015] Furthermore, one end of the follower arm arranged in the support frame is provided with a rotating gear, and the rotating gears arranged at the ends of the two follower arms are meshed and connected. The support frame is provided with a motor that can control the rotation of one of the follower arms and the rotating gear. With the movement of the rotating gear, the follower arm can adjust the size of its angle space, and the distance between the arc arm, the detection probe and the cleaning brush and the surface of the spherical storage tank can be adjusted.

[0016] In summary, the technical effects and advantages of the present invention are as follows:

[0017] The present invention can implement continuous and stable detection operations on vertical seams, annular seams and their intersections. The detection range involved is relatively wide and is suitable for the structural characteristics of the intersection of annular seams and vertical seams in spherical storage tanks. It reduces the time required for manual movement detection, improves the stability of the detection operation, reduces the detection deviation, and improves the efficiency of the detection operation. Before the detection work, impurities in the weld can be cleaned, effectively avoiding the wear caused by friction of impurities during the movement of the detection probe against the weld surface, thereby improving the service life of the detection probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0020] Figure 2 It is a schematic diagram of the structure from the second viewing angle of the present invention.

[0021] Figure 3 It is a schematic diagram of the connection structure between the docking arm and the connecting arm of the present invention.

[0022] Figure 4 It is a schematic diagram of the connection structure of the docking arm and the connecting arm from a second viewing angle of the present invention.

[0023] Figure 5 It is a schematic diagram of the rotating state of the arc arm of the present invention.

[0024] Figure 6 For the present invention Figure 5 Enlarged structural diagram at A in the middle.

[0025] Figure 7 This is a schematic diagram of the structure of the detection probe and the cleaning brush after reversing.

[0026] Figure 8 It is a schematic diagram of the structure of the connecting arm and the docking arm after synchronously adjusting the height of the present invention.

[0027] Fig. 9 This is a schematic diagram of the structure of the docking arm after adjusting the angle of the docking arm of the present invention.

[0028] Fig.10 It is a schematic diagram of the connection structure between the support arm and the support base of the present invention.

[0029] In the figure: 1. electric docking arm; 11. bracket; 12. first electric gear set; 13. first connecting wheel set; 14. support frame; 15. follower arm; 16. follower shaft; 17. limit wheel; 18. rotating gear; 2. arc arm; 21. first tooth set; 22. guide channel; 3. connecting arm; 31. second tooth set; 32. second connecting wheel set; 4. support arm; 41. second electric gear set; 42. traction track; 43. support seat; 44. frame; 45. universal wheel; 5. electric rotating rod; 6. detection probe; 7. cleaning brush. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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 creative work are within the scope of protection of the present invention.

[0031] Example 1: Reference Figure 1-10 The air tightness detection equipment for a spherical storage tank shown in the figure has a large volume. During the maintenance operation on the spherical storage tank, it is necessary to build a scaffolding suitable for the spherical storage tank so that the maintenance personnel can carry the equipment to the specified height and perform air tightness detection operations on the welds at different positions of the spherical storage tank.

[0032] The device comprises an electric docking arm 1 facing the annular seam of the spherical storage tank, an arc-shaped arm 2 arranged in the electric docking arm 1, and a connecting arm 3 connected to the central axis of the electric docking arm 1. The electric docking arm 1 can adjust the angle. In the natural state, the electric docking arm 1 faces the annular seam of the spherical storage tank and can move along the annular seam direction of the spherical storage tank to implement the detection operation.

[0033] As the detection requirements change, when the electric docking arm 1 is adjusted from a horizontal distribution state to a vertical distribution state, the arc arm 2 originally facing the annular seam of the spherical tank is switched to the vertical seam position facing the spherical tank, and can move along the vertical seam direction of the spherical tank to perform the detection operation. In addition, in order to adjust the height of the arc arm 2 according to the work requirements, the connecting arm 3, the electric docking arm 1 and the arc arm 2 can move synchronously along the vertical seam direction of the spherical tank.

[0034] The arc arm 2 can move along the distribution track of the electric docking arm 1, and an electric rotating rod 5 is provided at one end of the arc arm 2, and a detection probe 6 and a cleaning brush 7 are provided on the electric rotating rod 5, which can switch positions with the rotation of the electric rotating rod 5. During the movement of the arc arm 2, the detection probe 6 located on the electric rotating rod 5 can perform a flaw detection operation on the weld position to confirm whether there is damage at the weld position.

[0035] The detection probe 6 in the present application document is a weld flaw detection probe widely used in the prior art. It utilizes physical phenomena such as reflection, refraction and propagation of ultrasonic waves in an object, and infers the position and size of defects inside the object by receiving and analyzing echo signals. In weld detection, the ultrasonic probe emits high-frequency ultrasonic waves, which are directed to the weld to be detected, and then analyzes the internal quality of the weld based on the time, intensity and characteristics of the echo. The detection results can also be transmitted to the control system to determine whether the damaged part in the weld affects the air tightness.

[0036] Since the electric docking arm 1 can be switched to the position of the annular seam and the vertical seam facing the spherical storage tank according to work requirements, the arc arm 2 can perform continuous and stable detection operations on the vertical seam, the annular seam and their intersection positions during the mobile detection as the electric docking arm 1 switches positions. The detection range involved is relatively wide, which is suitable for the structural characteristics of the intersection of the annular seam and the vertical seam of the spherical storage tank. It reduces the time required for manual mobile detection, improves the stability of the detection operation, reduces the detection deviation, and improves the efficiency of the detection operation.

[0037] like Figure 3-6 As shown, specifically, in order to enable the arc-shaped arm 2 to move along the distribution track of the electric docking arm 1, a first tooth set 21 distributed along the arc track is provided on the side of the arc-shaped arm 2 away from the spherical storage tank, and the first tooth set 21 is meshed and connected with the first electric gear set 12, and a bracket 11 capable of carrying the first electric gear set 12 is provided in the electric docking arm 1. When the first electric gear set 12 is in operation, under the meshing force of the first tooth set 21 and the first electric gear set 12, the arc-shaped arm 2 can be smoothly moved along the direction of the annular seam and the vertical seam until the detection operation of the vertical seam, the annular seam and their intersection position is completed.

[0038] During the movement of the arc-shaped arm 2, in order to maintain the stability of the arc-shaped arm 2, the bracket 11 is provided with a first engaging wheel set 13 distributed along the arc-shaped track, and the arc-shaped arm 2 is provided with a guide channel 22 that can accommodate the first engaging wheel set 13 to pass through, and the first engaging wheel set 13 has a limiting effect on the arc-shaped arm 2. When the arc-shaped arm 2 moves along the distribution track of the electric docking arm 1, the relative position of the guide channel 22 and the first engaging wheel set 13 can be adjusted, and the accuracy of the moving track of the arc-shaped arm 2 can be maintained.

[0039] like Figure 1 , Figure 2 and Figure 8As shown, in order to adjust the height of the connecting arm 3, the electric docking arm 1 and the arc-shaped arm 2, and to detect the vertical seams, the annular seams and their intersections at different heights, a second tooth set 31 is provided on the side of the connecting arm 3 away from the electric docking arm 1, and a second electric gear set 41 is meshed and connected to the second tooth set 31. When the second electric gear set 41 rotates, the connecting arm 3 can be smoothly moved and the height adjusted under the meshing force between itself and the second tooth set 31.

[0040] The connecting arm 3 is provided with a support arm 4, and the support arm 4 is provided with a frame 44 that can carry the second electric gear set 41. When the second electric gear set 41 meshes with the second tooth set 31 and moves synchronously with the connecting arm 3 along the vertical seam direction of the spherical storage tank, the electric docking arm 1 and the arc arm 2 move synchronously therewith. Therefore, the detection height of the arc arm 2 and the detection probe 6 can be flexibly adjusted according to the actual working environment.

[0041] Since a traction track 42 is provided on the frame 44 and a second connecting wheel group 32 penetrating the traction track 42 is provided on the connecting arm 3, when the connecting arm 3 carries the electric docking arm 1 and the arc arm 2 to adjust the height along the vertical seam direction of the spherical storage tank, the second connecting wheel group 32 slides in the traction track 42 to maintain the accuracy of the moving trajectory of the connecting arm 3.

[0042] Since the volume of the spherical storage tank is relatively large, in order to enable the detection equipment to be moved to different positions of the spherical tank body, the air tightness detection operation is performed on all welds of the entire spherical storage tank. A support seat 43 is provided on the frame 44, and a movable universal wheel 45 is provided on the support seat 43. When the support seat 43 moves with the universal wheel 45, the stability of the entire detection equipment can be maintained.

[0043] Example 2: Figure 5-7 As shown, on the basis of Example 1, since the electric rotating rod 5 is provided with a detection probe 6 and a cleaning brush 7 which can switch positions with the rotation of the electric rotating rod 5, before implementing the detection operation, the cleaning brush 7 is rotated to the position of the detection probe 6. As the arc arm 2 moves, the cleaning brush 7 can clean the vertical seam, the annular seam and the intersection position thereof to remove impurities on their surfaces, thereby effectively avoiding the wear caused by friction of impurities during the movement of the detection probe 6 against the weld surface, thereby improving the service life of the detection probe 6.

[0044] When the cleaning work is completed, the cleaning brush 7 and the detection probe 6 rotate and reset, and the detection probe 6 can perform the detection operation as the arc arm 2 moves. In order to prevent the detection probe 6 from rubbing against the surface of the spherical storage tank during the synchronous rotation of the cleaning brush 7 and the detection probe 6, the width of the cleaning brush 7 needs to be greater than the width of the detection probe 6.

[0045] The electric docking arm 1 is provided with an upper and lower set of support frames 14, and a pair of follower arms 15 moving in opposite directions are provided in the support frames 14. The two follower arms 15 distributed from top to bottom on the same side are connected by a follower shaft 16, and a pair of limiting wheels 17 are provided on the follower shaft 16. Since the width of the cleaning brush 7 needs to be greater than the width of the detection probe 6, and the detection probe 6 must fit the weld surface during the detection process, in order to maintain the stability of the detection probe 6 and the cleaning brush 7 when they are in contact with the spherical storage tank, the detection probe 6 and the cleaning brush 7 can be closely attached to the weld surface. When the detection probe 6 and the cleaning brush 7 switch positions, the limiting wheels 17 are all in contact with the surface of the spherical storage tank.

[0046] Specifically, a rotating gear 18 is provided at one end of the follower arm 15 arranged in the support frame 14, and the rotating gears 18 arranged at the ends of the two follower arms 15 are meshed and connected. A motor that can control the rotation of one of the follower arms 15 and the rotating gear 18 is provided on the support frame 14. When the detection probe 6 and the cleaning brush 7 switch positions, based on the different widths of the detection probe 6 and the cleaning brush 7, the follower arm 15 can expand and contract with the movement of the rotating gear 18 to adjust the size of its angular space.

[0047] During the movement of the follower arm 15, the distances between the arc arm 2, the detection probe 6, the cleaning brush 7 and the surface of the spherical tank are adjusted. Therefore, whether the cleaning brush 7 performs a cleaning operation or the detection probe 6 performs a detection operation, during the operation, the limiting wheel 17 abuts against the surface of the spherical tank, so that the cleaning brush 7 and the detection probe 6 can be stably attached to the surface of the spherical tank body, maintaining the working efficiency during the cleaning operation of the cleaning brush 7 and the detection operation of the detection probe 6.

[0048] 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. An air tightness detection device for a spherical storage tank, characterized in that: The invention comprises an electric docking arm (1) facing the annular seam of a spherical storage tank, an arc-shaped arm (2) arranged in the electric docking arm (1), and a connecting arm (3) connected to the central axis of the electric docking arm (1); the electric docking arm (1) can adjust the angle; when the electric docking arm (1) is adjusted from a horizontal distribution state to a vertical distribution state, the arc-shaped arm (2) originally facing the annular seam of the spherical storage tank is switched to a vertical seam position facing the spherical storage tank; the connecting arm (3), the electric docking arm (1) and the arc-shaped arm (2) can move synchronously along the vertical seam direction of the spherical storage tank; The arc-shaped arm (2) can move along the distribution track of the electric docking arm (1), and an electric rotating rod (5) is provided at one end of the arc-shaped arm (2), and a detection probe (6) and a cleaning brush (7) are provided on the electric rotating rod (5), which can switch positions as the electric rotating rod (5) rotates; A first tooth set (21) distributed along an arc track is provided on a side of the arc-shaped arm (2) away from the spherical storage tank, a first electric gear set (12) is meshingly connected to the first tooth set (21), and a bracket (11) capable of carrying the first electric gear set (12) is provided inside the electric docking arm (1); The bracket (11) is provided with a first engaging wheel group (13) distributed along an arc track, and the arc arm (2) is provided with a guide channel (22) capable of accommodating the first engaging wheel group (13) to pass through, and when the arc arm (2) moves along the distribution track of the electric docking arm (1), the relative position of the guide channel (22) and the first engaging wheel group (13) can be adjusted; A second tooth set (31) is provided on a side of the connecting arm (3) away from the electric docking arm (1), and a second electric gear set (41) is meshingly connected to the second tooth set (31); The connecting arm (3) is provided with a support arm (4) externally, and the support arm (4) is provided with a frame (44) externally capable of carrying a second electric gear set (41); when the second electric gear set (41) meshes with the second tooth set (31) and moves synchronously with the connecting arm (3) along the vertical seam direction of the spherical storage tank, the electric docking arm (1) and the arc-shaped arm (2) move synchronously therewith; The frame (44) is provided with a traction track (42), and the connecting arm (3) is provided with a second connecting wheel group (32) that passes through the traction track (42); when the second tooth group (31) and the connecting arm (3) move synchronously along the vertical seam direction of the spherical storage tank, the second connecting wheel group (32) slides in the traction track (42).

2. The air tightness detection device for a spherical storage tank according to claim 1 is characterized in that: A support seat (43) is provided on the frame (44), and a movable universal wheel (45) is provided on the support seat (43).

3. The air tightness detection device for a spherical storage tank according to claim 1 is characterized in that: The electric docking arm (1) is provided with an upper and a lower set of support frames (14), each of which is provided with a pair of follower arms (15) moving in opposite directions, and the two follower arms (15) located on the same side and distributed from top to bottom are connected via a follower shaft (16), and each of the follower shafts (16) is provided with a pair of limiting wheels (17), and when the detection probe (6) and the cleaning brush (7) switch positions, the limiting wheels (17) are in contact with the surface of the spherical storage tank.

4. The air tightness detection device for a spherical storage tank according to claim 3 is characterized in that: One end of each follower arm (15) disposed in the support frame (14) is provided with a rotating gear (18), and the rotating gears (18) disposed at the ends of the two follower arms (15) are meshedly connected. A motor capable of controlling the rotation of one of the follower arms (15) and the rotating gear (18) is disposed on the support frame (14). With the movement of the rotating gear (18), the follower arm (15) can adjust the size of its included angle space, and the distance between the arc-shaped arm (2), the detection probe (6) and the cleaning brush (7) and the surface of the spherical storage tank can be adjusted.

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