Device for testing corrosion resistance of storage tank

Abstract

The invention relates to the technical field of storage tank testing, and discloses a storage tank corrosion resistance testing device which comprises a vehicle body, a rotating plate is horizontally and rotatably connected to the center of the top of the vehicle body through a mounting seat, and the rotating plate is locked and fixed through a screw. The position, located at the edge, of the top of the rotating plate is obliquely and rotationally connected with a rotating frame through a mounting base, two protrusions are integrally formed at the position, located in the rotating frame, of the top of the rotating plate, a power assembly for driving the rotating frame to rotate is arranged between the two protrusions, and two inserting holes are formed in the top of the rotating frame; and a connecting frame is arranged at the top of the rotating frame. According to the testing device, a worker does not need to hold the testing device by hand for flaw detection, so that the tank body can be conveniently detected, the testing efficiency is improved, the size of the testing device can be reduced, the testing device can be conveniently moved, the assembling stability of the connecting frame and the rotating frame can be ensured, and the use stability of the testing device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of storage tank testing, and particularly to an anti-corrosion testing device for storage tanks. Background Art

[0002] Storage tanks are industrial tools used to store liquids or gases. They are usually made of metal or plastic and have different designs and functions to meet various industrial applications and household needs. The interfaces of storage tanks adopt internationally applicable standard quick-release chuck type, and imported 316L or 304 stainless steel is selected. The inner surface is mirror-polished and equipped with various interfaces such as liquid level gauge interfaces, breather interfaces, thermometer interfaces, CIP cleaning ports, sight glasses, explosion-proof sight lamps, SIP sterilization ports, liquid inlet and outlet ports, and manholes.

[0003] Currently, when conducting anti-corrosion tests on storage tanks, the corrosion solution is filled into the storage tank. After a period of time, the solution is drained, and an ultrasonic flaw detector is used to detect the flaws in the tank body. Since storage tanks are relatively large and conventional flaw detectors are small, it is difficult to hold them by hand to detect the upper part of the tank body, resulting in low test efficiency. Summary of the Invention

[0004] Technical Problem to be Solved

[0005] Aiming at the deficiencies of the prior art, the present invention provides an anti-corrosion testing device for storage tanks, mainly to solve the problem that due to the relatively large size of storage tanks and the small size of conventional flaw detectors, it is difficult to hold them by hand to detect the upper part of the tank body, resulting in low test efficiency.

[0006] Technical Solution

[0007] To achieve the above object, the present invention provides the following technical solution:

[0008] An anti-corrosion test device for a storage tank, comprising a vehicle body. At the central position on the top of the vehicle body, a rotating plate is horizontally rotatably connected through a mounting seat and is fixed by screwing. At the edge position on the top of the rotating plate, a rotating frame is inclined and rotatably connected through a mounting seat. Two protrusions are integrally formed at the position within the rotating frame on the top of the rotating plate. A power assembly for driving the rotation of the rotating frame is provided between the two protrusions. Two jacks are formed at the top of the rotating frame. A connecting frame is provided at the top of the rotating frame. Two insertion blocks inserted into the jacks are fixedly connected to the bottom of the rotating frame. A rubber ring is fixedly connected to the outer side of the insertion block. Mounting assemblies are provided at both ends of the rotating frame to assemble the rotating frame and the connecting frame. A multi-stage electric push rod is fixedly connected to one side of the connecting frame. One end of the telescopic part of the multi-stage electric push rod passes through the connecting frame and is fixedly connected to a mounting frame. A rotating groove is formed on one side of the mounting frame. A rotating block is rotatably connected in the rotating groove and is fixed by screwing. A sliding opening is formed on one side of the rotating block. A sliding rod is slidably connected in the sliding opening. One end of the sliding rod is fixedly connected to an elastic frame. One end of the elastic frame is fixedly connected to an ultrasonic probe. A spring is sleeved on the outer side of the sliding rod, and both ends of the spring are fixed to the rotating block and the sliding rod respectively.

[0009] Further, the power assembly includes a lead screw rotatably connected between the two protrusions. A self-locking motor is fixedly connected to one side of one of the protrusions, and one end of the output shaft of the self-locking motor passes through the protrusion and is fixed to the lead screw. A push plate that moves along the horizontal plane of the rotating plate is threadedly connected to the outer side of the lead screw. Force arms are rotatably connected to both ends of the push plate. The two force arms are respectively rotatably connected to both sides of the rotating frame, and both force arms are in an inclined state.

[0010] On the basis of the foregoing solution, the mounting assembly includes two slots respectively formed at both ends of the rotating frame. Plug heads adapted to the slots are integrally formed at both ends of the connecting frame. A clamping assembly for assisting in fixing the connecting frame and the rotating frame is provided at the bottom of the plug head.

[0011] As a further solution of the present invention, the clamping assembly includes a slider. A sliding hole is formed at the bottom of the plug head. The slider is slidably connected in the sliding hole. An avoidance groove communicated with the sliding hole is formed in the plug head, and the slider extends into the avoidance groove. Two elastic cloths are fixedly connected to both sides of the avoidance groove and are fixed to the slider. An arc-shaped groove is formed on one side of the slider. A positioning hole is formed at the bottom of the slot. An elastic ball is fixedly connected in a placement groove on one side of the positioning hole.

[0012] Furthermore, two sliding grooves are provided at the tops of the rotating frame and the connecting frame, and the mounting frame is slidably connected to the sliding grooves. The two sliding grooves on the rotating frame communicate with the two slots respectively. The two sliding grooves on the connecting frame penetrate through the two plugs respectively, and the avoidance groove is located below the sliding groove and communicates with the sliding groove.

[0013] On the basis of the foregoing solution, a limiting block is fixedly connected inside the elastic frame to limit the deformation distance of the elastic frame.

[0014] As a further solution of the present invention, a plurality of cylinders are fixedly connected to the outer side of the elastic frame. Installation grooves are provided at one ends of the plurality of cylinders, and balls are rotatably connected in the installation grooves.

[0015] Beneficial effects

[0016] Compared with the prior art, the present invention provides a corrosion resistance test device for a storage tank, which has the following beneficial effects:

[0017] 1. Through the combined use of the mounting frame and the ultrasonic probe, after the rotating frame and the connecting frame are assembled, the rotating frame is rotated by 90 degrees, and then the ultrasonic probe is brought into contact with the outer wall of the tank. Subsequently, the ultrasonic probe is driven by the mounting frame to move for flaw detection of the tank, so that it is not necessary for the staff to hold the ultrasonic probe for flaw detection, thus facilitating the detection of the tank body and improving the test efficiency.

[0018] 2. Through the setting of the mounting component, the connecting frame and the rotating frame are set to a split structure. When not in use, the connecting frame is placed on the mounting frame, so that the volume of the test device can be reduced, and it is convenient to move the test device.

[0019] 3. Through the setting of the clamping component, after the connecting frame and the rotating frame are assembled, the connecting frame and the rotating frame can be stably installed under the action of the clamping component, so as to ensure the stability of the assembly of the connecting frame and the rotating frame and improve the stability of the use of the test device.

[0020] 4. Through the setting of the elastic frame, when the ultrasonic probe contacts the outer wall of the tank, the angle of the ultrasonic probe can be changed under the action of the elastic frame, so that the ultrasonic probe fits the outer wall of the tank, improving the accuracy of the detection by the ultrasonic probe.

[0021] 5. Through the setting of the balls, when the ultrasonic probe contacts the outer wall of the tank, the balls will also contact the tank. When the ultrasonic probe moves, the balls will roll, so that the friction force when the ultrasonic probe moves can be reduced, improving the use effect of the test device. Description of the drawings

[0022] Figure 1Schematic three-dimensional structure diagram of a corrosion resistance testing device for a storage tank proposed by the present invention;

[0023] Figure 2 Partial enlarged structure diagram of a corrosion resistance testing device for a storage tank proposed by the present invention;

[0024] Figure 3 Enlarged structure diagram of the connecting frame of a corrosion resistance testing device for a storage tank proposed by the present invention;

[0025] Figure 4 Enlarged structure diagram of the ultrasonic probe of a corrosion resistance testing device for a storage tank proposed by the present invention;

[0026] Figure 5 Cross-sectional structure diagram of the plug of a corrosion resistance testing device for a storage tank proposed by the present invention;

[0027] Figure 6 Enlarged structure diagram of the elastic ball of a corrosion resistance testing device for a storage tank proposed by the present invention.

[0028] In the figure: 1, vehicle body; 2, rotating plate; 3, rotating frame; 4, connecting frame; 5, push plate; 6, jack; 7, slot; 8, sliding groove; 9, lever arm; 10, lead screw; 11, self-locking motor; 12, plug; 13, insertion block; 14, spring; 15, sliding rod; 16, rotating groove; 17, mounting frame; 18, multi-stage electric push rod; 19, rotating block; 20, rubber ring; 21, elastic frame; 22, mounting groove; 23, ultrasonic probe; 24, ball; 25, limit block; 26, avoidance groove; 27, slider; 28, elastic cloth; 29, arc-shaped groove; 30, sliding hole; 31, elastic ball; 32, placement groove; 33, positioning hole. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Refer to Figures 1 - 6, a corrosion resistance test device for a storage tank, including a vehicle body 1. The top of the vehicle body 1 at the central position is horizontally rotatably connected to a rotating plate 2 through a mounting seat, and the rotating plate 2 is fixed by screwing. The top of the rotating plate 2 at the edge position is obliquely rotatably connected to a rotating frame 3 through a mounting seat. Two protrusions are integrally formed at the position of the rotating plate 2 inside the rotating frame 3. A power component for driving the rotation of the rotating frame 3 is provided between the two protrusions. Two jacks 6 are opened at the top of the rotating frame 3. A connecting frame 4 is provided at the top of the rotating frame 3. Two insertion blocks 13 inserted into the jacks 6 are welded to the bottom of the rotating frame 3. A rubber ring 20 is adhered to the outside of the insertion block 13. Mounting components are provided at both ends of the rotating frame 3 to assemble the rotating frame 3 and the connecting frame 4. A multi-stage electric push rod 18 is fixed to one side of the connecting frame 4 by bolts. One end of the telescopic part of the multi-stage electric push rod 18 passes through the connecting frame 4 and is fixed to a mounting frame 17 by bolts. A rotating groove 16 is opened on one side of the mounting frame 17. A rotating block 19 is rotatably connected in the rotating groove 16, and the rotating block 19 is fixed by screwing. A sliding port is opened on one side of the rotating block 19. A sliding rod 15 is slidably connected in the sliding port. One end of the sliding rod 15 is welded to an elastic frame 21. One end of the elastic frame 21 is fixed to an ultrasonic probe 23 by bolts. The model of the ultrasonic probe 23 is 1-5P13X13K1K2K2.5K3. A spring 14 is sleeved on the outside of the sliding rod 15, and both ends of the spring 14 are fixed to the rotating block 19 and the sliding rod 15 respectively. Take out the connecting frame 4 from the rotating frame 3 to separate the insertion block 13 from the jack 6, and then assemble the connecting frame 4 and the rotating frame 3 through the mounting components. Then, make the rotating frame 3 rotate 90 degrees through the power component. Then, rotate the rotating block 19 upward. The rotating block 19 will drive the sliding rod 15 to rotate. The sliding rod 15 will drive the ultrasonic probe 23 to rotate through the elastic frame 21. When the sliding rod 15 rotates to 90 degrees with the mounting frame 17, fix the rotating block 19 with screws. Then, move the vehicle body 1 to make the ultrasonic probe 23 contact the tank body. Since the force on the spring 14 is greater than the force on the elastic frame 21, the elastic frame 21 will be squeezed and deformed, so that the ultrasonic probe 23 fits the tank body. Then, push the mounting frame 17 to move through the multi-stage electric push rod 18, so that the ultrasonic probe 23 moves along the surface of the tank body. Since the tank body is arc-shaped, when the ultrasonic probe 23 moves along the surface of the tank body, the sliding rod 15 will move and squeeze the spring 14, so that the ultrasonic probe 23 detects the flaw of the tank body. It is not necessary for the staff to hold the ultrasonic probe for flaw detection, which is convenient for detecting the tank body and improves the test efficiency.

[0031] In the present invention, the power assembly includes a lead screw 10 which is rotatably connected between two protrusions. A self-locking motor 11 is fixed to one side of one of the protrusions by bolts, and one end of the output shaft of the self-locking motor 11 passes through the protrusion and is fixed to the lead screw 10. A push plate 5 that moves along the horizontal plane of the rotating plate 2 is threadedly connected to the outside of the lead screw 10. Both ends of the push plate 5 are rotatably connected to force arms 9, and the two force arms 9 are respectively rotatably connected to both sides of the rotating frame 3, and both force arms 9 are in an inclined state. When the self-locking motor 11 is started, the self-locking motor 11 will drive the lead screw 10 to rotate. The lead screw 10 will cause the push plate 5 to move along the horizontal plane of the rotating plate 2 through the threaded engagement with the push plate 5. During the movement of the push plate 5, the push plate 5 will push the rotating frame 3 to rotate upward through the force arms 9. The rotating frame 3 will drive the connecting frame 4 to rotate. At the same time, the force arms 9 will rotate between the push plate 5 and the rotating frame 3. When the rotating frame 3 rotates 90 degrees, the self-locking motor 11 is turned off. At this time, the position of the push plate 5 is fixed through the threaded engagement between the lead screw 10 and the push plate 5, so that the rotating frame 3 is fixed;

[0032] Particularly, the installation component includes two slots 7, which are respectively arranged at both ends of the rotating frame 3. Both ends of the connecting frame 4 are integrally formed with plugs 12 adapted to the slots 7, and the plugs 12 can be inserted into the slots 7. A clamping component for assisting in fixing the connecting frame 4 and the rotating frame 3 is provided at the bottom of the plug 12. The clamping component includes a slider 27. A sliding hole 30 is opened at the bottom of the plug 12. The slider 27 is slidably connected in the sliding hole 30. An avoidance groove 26 communicating with the sliding hole 30 is opened in the plug 12, and the slider 27 extends into the avoidance groove 26. Two elastic cloths 28 are bonded to both sides of the avoidance groove 26, and the elastic cloths 28 are fixed to the slider 27. An arc-shaped groove 29 is opened on one side of the slider 27. A positioning hole 33 is opened at the bottom of the slot 7, and the slider 27 can be inserted into the positioning hole 33. A placement groove 32 is opened on one side of the positioning hole 33. An elastic ball 31 is bonded in the placement groove 32, and the elastic ball 31 can be clamped with the arc-shaped groove 29. Two sliding grooves 8 are opened at the top of both the rotating frame 3 and the connecting frame 4, and the mounting frame 17 is slidably connected with the sliding grooves 8. The two sliding grooves 8 on the rotating frame 3 are respectively communicated with the two slots 7. The two sliding grooves 8 on the connecting frame 4 respectively penetrate through the two plugs 12, and the avoidance groove 26 is located below the sliding groove 8 and communicated with the sliding groove 8. Push the slider 27 to move upward along the sliding hole 30. The slider 27 will stretch the elastic cloth 28 and make the elastic cloth 28 generate elastic force. Then insert the plug 12 on the connecting frame 4 into the slot 7 on the rotating frame 3. Since the shape of the slot 7 is convex, the connecting frame 4 can be prevented from tilting when the plug 12 is inserted into the slot 7. When the plug 12 on the connecting frame 4 is completely inserted into the slot 7, the slider 27 will be aligned with the positioning hole 33. At this time, the elastic cloth 28 will pull the slider 27 to move downward and reset under the action of its own elastic force, so that the slider 27 is inserted into the positioning hole 33. At this time, the slider 27 will squeeze the elastic ball 31 to make the elastic ball 31 deform. When the slider 27 is completely reset, the elastic ball 31 will be aligned with the arc-shaped groove 29, and the elastic ball 31 will be restored and clamped into the arc-shaped groove 29 by its own elastic force, thereby assisting in fixing the connecting frame 4 and the rotating frame 3. A limiting block 25 is fixed in the elastic frame 21 by bolts, so that the deformation distance of the elastic frame 21 is limited. The limiting block 25 can prevent the elastic frame 21 from being damaged due to excessive deformation. A plurality of cylinders are welded on the outer side of the elastic frame 21. Installation grooves 22 are opened at one ends of the plurality of cylinders. A ball 24 is rotatably connected in the installation groove 22. When the ultrasonic probe 23 contacts the outer wall of the can, the ball 24 will also contact the can. When the ultrasonic probe 23 moves, the ball 24 will roll, thereby reducing the friction force when the ultrasonic probe 23 moves and improving the use effect of the testing device.

[0033] Working principle of this embodiment: When in use, take out the connecting frame 4 from the rotating frame 3 and disengage the plug block 13 from the jack 6. Then, push the slider 27 upward along the sliding hole 30. The slider 27 will stretch the elastic cloth 28 and cause the elastic cloth 28 to generate elastic force. Then, insert the plug 12 on the connecting frame 4 into the slot 7 on the rotating frame 3. Since the shape of the slot 7 is convex, the connecting frame 4 can be prevented from tilting when the plug 12 is inserted into the slot 7. When the plug 12 on the connecting frame 4 is completely inserted into the slot 7, the slider 27 will align with the positioning hole 33. At this time, the elastic cloth 28 will pull the slider 27 downward to reset under the action of its own elastic force, so that the slider 27 is inserted into the positioning hole 33. At this time, the slider 27 will squeeze the elastic ball 31 to cause the elastic ball 31 to deform. When the slider 27 is completely reset, the elastic ball 31 will align with the arc-shaped groove 29, and the elastic ball 31 will be restored by its own elastic force and snap into the arc-shaped groove 29, thereby assisting in fixing the connecting frame 4 and the rotating frame 3. Then, start the self-locking motor 11. The self-locking motor 11 will drive the screw rod 10 to rotate. The screw rod 10 will cause the push plate 5 to move along the horizontal plane of the rotating plate 2 through the thread engagement with the push plate 5. During the movement of the push plate 5, the rotating frame 3 will be pushed upward to rotate through the force arm 9. The rotating frame 3 will drive the connecting frame 4 to rotate. At the same time, the force arm 9 will rotate between the push plate 5 and the rotating frame 3. When the rotating frame 3 rotates 90 degrees, turn off the self-locking motor 11. At this time, the position of the push plate 5 is fixed through the thread engagement between the screw rod 10 and the push plate 5, so that the rotating frame 3 is fixed. Then, rotate the rotating block 19 upward. The rotating block 19 will drive the sliding rod 15 to rotate. The sliding rod 15 will drive the ultrasonic probe 23 to rotate through the elastic frame 21. When the sliding rod 15 rotates to 90 degrees with the mounting frame 17, fix the rotating block 19 with screws. Then, move the vehicle body 1 to make the ultrasonic probe 23 contact the tank body. Since the force on the spring 14 is greater than the force on the elastic frame 21, the elastic frame 21 will be squeezed and deformed, so that the ultrasonic probe 23 fits the tank body. Then, push the mounting frame 17 to move through the multi-stage electric push rod 18, so that the ultrasonic probe 23 moves along the surface of the tank body. Since the tank body is arc-shaped, the ultrasonic probe 23 will move the sliding rod 15 and squeeze the spring 14 when moving along the surface of the tank body, so that the ultrasonic probe 23 performs flaw detection on the tank body, eliminating the need for workers to hold the probe for flaw detection, thus facilitating the detection of the tank body and improving the testing efficiency.

[0034] All the electrical components mentioned in this article are electrically connected to the external main controller and 220V mains power supply, and the main controller can be a conventional known device such as a computer for control.

[0035] In the description herein, it should be noted that relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising", or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions, and variations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A storage tank corrosion resistance testing device, comprising a vehicle body (1), characterized in that: The top of the vehicle body (1) is located at the center and is horizontally rotatably connected to a rotating plate (2) through a mounting seat, and the rotating plate (2) is fixed by screw locking, and the top of the rotating plate (2) is located at the edge and is tiltably rotatably connected to a rotating frame (3) through a mounting seat, and the top of the rotating plate (2) is located inside the rotating frame (3) and has two protrusions integrally formed therein, and a power component for driving the rotating frame (3) to rotate is provided between the two protrusions, and the top of the rotating frame (3) is provided with two plug holes (6), and the top of the rotating frame (3) is provided with a connecting frame (4), and the bottom of the rotating frame (3) is fixedly connected with two plug blocks (13) plugged into the plug holes (6), and the outer side of the plug block (13) is fixedly connected with a rubber ring (20), and both ends of the rotating frame (3) are provided with mounting components to enable the rotating frame (3) to rotate. The frame (3) and the connecting frame (4) are assembled, one side of the connecting frame (4) is fixedly connected with a multi-stage electric push rod (18), one end of the telescopic part of the multi-stage electric push rod (18) passes through the connecting frame (4) and is fixedly connected with a mounting frame (17), one side of the mounting frame (17) is provided with a rotating groove (16), a rotating block (19) is rotatably connected in the rotating groove (16), and the rotating block (19) is fixed by screw locking, one side of the rotating block (19) is provided with a sliding opening, a sliding rod (15) is slidably connected in the sliding opening, one end of the sliding rod (15) is fixedly connected with an elastic frame (21), one end of the elastic frame (21) is fixedly connected with an ultrasonic probe (23), the outer side of the sliding rod (15) is sleeved with a spring (14), and the two ends of the spring (14) are respectively fixed to the rotating block (19) and the sliding rod (15).

2. A storage tank corrosion resistance testing device according to claim 1, characterized in that: The power assembly comprises a screw rod (10), wherein the screw rod (10) is rotatably connected between two protrusions, wherein a self-locking motor (11) is fixedly connected to one side of one of the protrusions, and one end of the output shaft of the self-locking motor (11) passes through the protrusion and is fixed to the screw rod (10), and the outer side of the screw rod (10) is threadedly connected to a push plate (5) that moves along the horizontal plane of the rotating plate (2), and both ends of the push plate (5) are rotatably connected to force arms (9), and the two force arms (9) are respectively rotatably connected to the two sides of the rotating frame (3), and the two force arms (9) are both in an inclined state.

3. A storage tank corrosion resistance testing device according to claim 1, characterized in that: The mounting assembly comprises two slots (7), the two slots (7) being respectively arranged at the two ends of the rotating frame (3), the two ends of the connecting frame (4) being integrally formed with plugs (12) adapted to the slots (7), and the bottom of the plug (12) being provided with a snap-fit ​​assembly for auxiliary fixing of the connecting frame (4) and the rotating frame (3).

4. A storage tank corrosion resistance testing device according to claim 3, characterized in that: The engaging assembly comprises a slider (27), a sliding hole (30) is provided at the bottom of the plug (12), the slider (27) is slidably connected in the sliding hole (30), a avoiding groove (26) connected to the sliding hole (30) is provided in the plug (12), and the slider (27) extends into the avoiding groove (26), two elastic cloths (28) are fixedly connected to both sides of the avoiding groove (26), and the elastic cloths (28) are fixed to the slider (27), an arc groove (29) is provided on one side of the slider (27), a positioning hole (33) is provided at the bottom of the slot (7), a placement groove (32) is provided on one side of the positioning hole (33), and an elastic ball (31) is fixedly connected in the placement groove (32).

5. The storage tank corrosion resistance testing device according to claim 1, characterized in that: The tops of the rotating frame (3) and the connecting frame (4) are both provided with two slide grooves (8), and the mounting frame (17) is slidably connected to the slide grooves (8), the two slide grooves (8) on the rotating frame (3) are respectively connected to the two slots (7), the two slide grooves (8) on the connecting frame (4) respectively penetrate the two plugs (12), and the avoidance groove (26) is located below the slide groove (8) and is connected to the slide groove (8).

6. The storage tank corrosion resistance testing device according to claim 1, characterized in that: A limiting block (25) is fixedly connected inside the elastic frame (21) so that the deformation distance of the elastic frame (21) is limited.

7. A storage tank corrosion resistance testing device according to claim 6, characterized in that: A plurality of cylinders are fixedly connected to the outer side of the elastic frame (21), one end of each of the cylinders is provided with a mounting groove (22), and a ball (24) is rollingly connected in the mounting groove (22).

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