阅读说明：本技术 基于超声波的原油及lng储罐底板检测实验装置 (Crude oil and LNG storage tank bottom plate detection experiment device based on ultrasonic wave ) 是由 顾继俊 刘松 徐翔 张香怡 常冉 于 2019-09-18 设计创作，主要内容包括：本发明公开了一种基于超声波的原油及LNG储罐底板检测实验装置,包括试验台底座(10)、水平移动机构(20)和探头提升机构(30),探头提升机构(30)能够使探头(32)沿Z轴方向移动；水平移动机构(20)能够使探头提升机构(30)和探头(32)沿X轴和Y轴方向移动；试验台底座(10)能够放置和固定待测储罐(40)。该基于超声波的原油及LNG储罐底板检测实验装置具有在储罐测量底板厚度时夹持稳定、牢固,探头移动方便,安全性高等优点。(The invention discloses a crude oil and LNG storage tank bottom plate detection experimental device based on ultrasonic waves, which comprises a test bed base (10), a horizontal moving mechanism (20) and a probe lifting mechanism (30), wherein the probe lifting mechanism (30) can enable a probe (32) to move along the Z-axis direction; the horizontal moving mechanism (20) can enable the probe lifting mechanism (30) and the probe (32) to move along the X-axis direction and the Y-axis direction; the test bed base (10) can be used for placing and fixing the storage tank (40) to be tested. This crude oil and LNG storage tank bottom plate detection experiment device based on ultrasonic wave has that the centre gripping is stable, firm when the storage tank measures bottom plate thickness, and the probe removes conveniently, and advantages such as security height.)

1. The ultrasonic wave-based crude oil and LNG storage tank bottom plate detection experimental device is characterized by comprising the following components in a spatial rectangular coordinate system with X, Y, Z axes as coordinate axes:

a probe lifting mechanism (30) which can move the probe (32) along the Z-axis direction;

a horizontal movement mechanism (20) which can move the probe lifting mechanism (30) and the probe (32) along the X-axis direction and the Y-axis direction;

the test bed base (10) can be used for placing and fixing the storage tank (40) to be tested.

2. The experimental apparatus for detecting the bottom plate of the crude oil and LNG storage tank based on ultrasonic waves as claimed in claim 1, wherein the test bed base (10) is of a groove-shaped structure, the test bed base (10) comprises a first upper flat plate (11), a first vertical plate (12), a bottom plate (13), a second vertical plate (14) and a second upper flat plate (15) which are sequentially connected, the upper surface of the first upper flat plate (11) and the upper surface of the second upper flat plate (15) are located on the same horizontal plane, and the storage tank (40) to be tested can be located between the first vertical plate (12) and the second vertical plate (14).

3. The experimental apparatus for detecting the bottom plate of the crude oil and LNG storage tank based on ultrasonic waves as claimed in claim 2, wherein the test bed base (10) further comprises a clamping mechanism for clamping and fixing the storage tank (40) to be tested, the clamping mechanism comprises a clamping sheet (16) and a cylinder (17) which are sequentially connected, the cylinder (17) is correspondingly connected with the first vertical plate (12) and the second vertical plate (14) one by one, the clamping sheet (16) is of an arc structure, and the central angle corresponding to the clamping sheet (16) is 90 °.

4. The experimental device for detecting the bottom plate of the crude oil and LNG storage tank based on the ultrasonic waves as claimed in claim 2, wherein the horizontal moving mechanism (20) comprises a first X-axis lead screw (21) and a second X-axis lead screw (22), the first X-axis lead screw (21) and the second X-axis lead screw (22) are both parallel to the X axis, both ends of the first X-axis lead screw (21) are connected with the first upper flat plate (11) through a first lead screw base, both ends of the second X-axis lead screw (22) are connected with the second upper flat plate (15) through a second lead screw base, one end of the first X-axis lead screw (21) is connected with an X-axis motor (23), and ball nuts are sleeved outside the first X-axis lead screw (21) and the second X-axis lead screw (22).

5. The experimental device for detecting the bottom plate of the crude oil and LNG storage tank based on the ultrasonic waves as claimed in claim 4, wherein the horizontal moving mechanism (20) further comprises a Y-axis lead screw (24) and a Y-axis bridge (25), both the Y-axis lead screw (24) and the Y-axis bridge (25) are parallel to the Y axis, one end of the Y-axis lead screw (24) is connected with a Y-axis motor (26), the other end of the Y-axis lead screw (24) is connected with a third lead screw base (27), the Y-axis motor (26) is fixedly connected with a ball nut sleeved on the first X-axis lead screw (21), and the third lead screw base (27) is fixedly connected with a ball nut sleeved on the second X-axis lead screw (22).

6. The experimental device for detecting the bottom plate of the crude oil and LNG storage tank based on the ultrasonic waves of claim 5, wherein the Y-axis bridge (25) and the Y-axis screw (24) are arranged up and down, the section of the Y-axis bridge (25) is T-shaped, one end of the Y-axis bridge (25) is fixedly connected with a ball nut sleeved on the first X-axis screw (21) through an L-shaped supporting plate, and the other end of the Y-axis bridge (25) is fixedly connected with a ball nut sleeved on the second X-axis screw (22) through another L-shaped supporting plate.

7. The experimental device for detecting the bottom plate of the crude oil and LNG storage tank based on the ultrasonic waves as claimed in claim 6, wherein the probe lifting mechanism (30) comprises a Z-axis lead screw (36), a lifting base (37) and a Z-axis motor (39), the Z-axis lead screw (36) is parallel to the Z axis, the Z-axis lead screw (36) and the Y-axis lead screw (24) both penetrate through the lifting base (37), the lifting base (37) is connected with the Y-axis bridge (25) in a matching manner, and the Z-axis motor (39) can drive the Z-axis lead screw (36) to move along the Z axis direction.

8. The experimental apparatus for detecting the bottom plate of the crude oil and LNG tank based on ultrasonic waves as claimed in claim 7, wherein a T-shaped groove (374) is formed above the middle of the lifting base (37), the T-shaped groove (374) is connected with the Y-axis bridge (25) in a matching manner, a first upper supporting plate (371) and a first lower supporting plate (372) are arranged on one side of the lifting base (37) in an up-and-down manner, and the Z-axis lead screw (36) penetrates through the first upper supporting plate (371) and the first lower supporting plate (372).

9. The experimental device for detecting the bottom plate of the crude oil and LNG storage tank based on the ultrasonic waves of claim 8, wherein a second upper supporting plate (373) is arranged on the other side of the lifting base (37), the first upper supporting plate (371) and the second upper supporting plate (373) are symmetrically arranged, a motor support plate (310) is connected above the lifting base (37), a Z-axis motor (39) is fixedly connected with the motor support plate (310), the Z-axis motor (39) is connected with a Z-axis lead screw (36) sequentially through a pinion and a bull gear (38), the bull gear (38) is sleeved outside the Z-axis lead screw (36), the bull gear (38) is in threaded connection with the Z-axis lead screw (36), and the bull gear (38) is located between the first upper supporting plate (371) and the motor support plate (310).

10. The experimental apparatus for detecting the bottom plate of the crude oil and LNG storage tank based on the ultrasonic waves as claimed in claim 7, wherein the probe lifting mechanism (30) further comprises a fine adjustment motor (35), a fine adjustment gear (33) and a fine adjustment rack (34) which are sequentially connected, the fine adjustment rack (34) is parallel to the Z-axis lead screw (36), the lower end of the Z-axis lead screw (36) is connected with a mounting plate (311), the fine adjustment rack (34) penetrates through the mounting plate (311), the probe (32) is fixed at the lower end of the fine adjustment rack (34), the fine adjustment motor (35) is fixed on the mounting plate (311), and the fine adjustment motor (35) can drive the fine adjustment rack (34) to move along the Z-axis direction.

Technical Field

The invention relates to the field of storage tank detection equipment, in particular to a crude oil and LNG storage tank bottom plate detection experimental device based on ultrasonic waves.

Background

Petroleum is a blood vessel developed by modern industry, is used as an indispensable strategic material for national development, and has irreplaceable status in the aspects of promoting the development of national economic society and guaranteeing national defense safety. With the continuous development of human beings, less and less oil can be produced in the world at present. In order to meet the demand of petroleum and guarantee the national energy safety, a plurality of countries in the world establish own petroleum reserve bases. According to related reports, at present, 9 national oil reserves such as Tianjin, Zhoushan, Dalian and Lanzhou have been built in China, the total reserve capacity exceeds 3000 ten thousand tons, and the number of large-scale storage tanks is nearly 7000.

Petroleum storage tanks are affected by the environment and conditions of use and are often affected by corrosion factors. The bottom plate of the storage tank is special in position, and not only can be corroded by sulfur dioxide, hydrogen sulfide and the like in petroleum, but also can be corroded by micro-electronics formed by aqueous solution and a metal bottom surface. Thus, the bottom of an oil storage tank is one of the most vulnerable locations of the tank. Once the storage tank is corroded, the service life of the storage tank is greatly shortened, and the storage tank is cracked under severe conditions, so that the storage tank cannot be normally used. Once the storage tank is cracked or exploded, serious safety accidents can be caused, unpredictable economic losses can be caused, and the environment can be greatly polluted, so that a series of ecological problems can be caused. According to incomplete statistics, up to now, the safety accidents caused by petroleum storage tanks in the world are not less than eighty, which causes nearly 500 deaths and huge property loss, and causes large-area environmental pollution. Therefore, the storage tank is regularly checked for safety, particularly the bottom of the storage tank which is most vulnerable to damage, the safety of the storage tank in the operation period is ensured, the petroleum storage tank with potential safety hazards is timely maintained and replaced, and the safety of production is required to be ensured.

In conventional storage tank safety inspection, firstly, the storage tank needs to be stopped, then, a series of cleaning work is carried out on the inner surface of the storage tank to ensure the cleanliness of the inner surface of the storage tank, and finally, storage tank detection is carried out. The method has the advantages of long consumed time period, multiple detection processes, high production stop loss, incapability of detecting the storage tank in real time and certain limitation.

With the increasing quantity of petroleum storage tanks in China and the increasing safety consciousness of people, an online storage tank detection method which has higher detection precision and safer detection and can accurately judge the performance of each aspect of the storage tank without opening the tank is explored and researched, so that the method is an important way for realizing safe production and green development and is one of large directions for the detection and development progress of the petroleum storage tanks.

At present, the detection methods of common oil storage tanks mainly comprise:

1. x-ray detection

The X-ray detection is to use an X-ray machine to transilluminate the storage tank, so as to visually display the physical information of the defects of the petroleum storage tank, including the shapes, the positions and the like of the defects. The defects that can be detected are: cracks, pores, lack of fusion, lack of penetration, etc.

X-ray detection is commonly used for detecting the weld defects of the petroleum storage tank by utilizing the difference of the defects on the X-ray light sensing luminous energy. This is because the content of each element in the weld differs from that of each element in other normal places, and therefore the sensitivity to X-rays differs. The X-ray detection displays the condition inside the oil storage tank in the form of images, and a detector can clearly see information such as the position of a defect. However, the main part of the X-ray detection is the tank body of the oil storage tank, and is not specific to the tank bottom of the oil storage tank. And the X-ray radiates both people and the surrounding environment, which is not in accordance with the concept of green development.

2. Acoustic emission detection

The acoustic emission detection is to generate elastic waves by using an acoustic emission instrument, the waves are transmitted to the surface of the storage tank to cause the displacement of the surface of the storage tank, then a related sensor is used for sensing the change of the elastic waves, a displacement signal is converted into an observable electric signal, and a series of conversion and processing are carried out to obtain related information of the damage of the storage tank.

The acoustic emission detection can realize the detection of the bottom of the petroleum storage tank, but has higher requirement on the cleanliness of the bottom of the storage tank. If the tank bottom has more attachments or sediments, the elastic wave signal can be greatly attenuated, and the detection effect is reduced. Acoustic emission can achieve real-time dynamic monitoring, but static defects cannot be detected, and the equipment is expensive, generally requiring review by other conventional non-destructive inspection methods.

3. Eddy current testing

Eddy current inspection does not require cleaning of the storage tank in advance and is commonly used in the industry to inspect spherical petroleum storage tanks. The design concept of eddy current inspection comes from the familiar electromagnetic induction principle. When the conductor is close to a coil which is communicated with alternating current, the periphery of the conductor can also excite a self magnetic field, the generated magnetic field can change the previous magnetic field, when the surface of the conductor is defective, the magnetic field excited by the conductor can generate corresponding change, and the detection coil is used for sensing and measuring the change, so that the information of the defect of the storage tank can be indirectly detected.

The eddy current detection has high detection precision, and very small defects can be detected. However, eddy current testing has its own drawbacks, in that it can only detect defects on the surface of the tank, which are often undetectable with respect to internal corrosion or defects.

4. Magnetic particle testing

Magnetic particle inspection is one of the relatively mature storage tank inspection methods at present. Before carrying out magnetic particle testing to the storage tank, it is clean to need the storage tank, and again with the magnetic sprinkle uniformly on the storage tank bottom that awaits measuring, whether there is the defect at the tank bottom is judged through the demonstration condition of magnetic by relevant technical staff.

Magnetic particle inspection has many advantages, firstly its operating cost is low, compared with other inspection methods, magnetic particle inspection is simpler, and the inspection precision can generally meet the requirements. However, the magnetic particle inspection has the defect that the magnetic particle inspection cannot be compensated, the magnetic particle inspection has high requirements on the smoothness of the surface of the petroleum storage tank, and only the position of a defect can be detected, and relevant information such as the size of the defect cannot be obtained. The result of storage tank detection can not be preserved in the mode of data, and the experience of technical staff has great influence to the testing result, can not satisfy the requirement of present intelligent detection.

5. Ultrasonic testing

Ultrasonic waves exist as a special form of guided waves in test pieces of plate-like structure. Ultrasonic detection firstly utilizes a probe to excite a plate-shaped test piece to generate ultrasonic waves, then the ultrasonic waves are transmitted in the test piece and can generate emission, refraction and the like, when the interior of the test piece has defects, the ultrasonic waves can be attenuated, and waveform signals can be mutated; and converting the acoustic signal into a voltage signal by using the probe, and displaying a waveform signal carrying defect information on an oscilloscope. By analyzing and researching the waveform signals, the related information of the defects in the test piece can be obtained.

The ultrasonic wave is utilized to detect the bottom of the petroleum storage tank, so that the method has many advantages, the detection precision can meet the industrial requirements, the ultrasonic wave does not radiate the human body, the human body and the surrounding environment of the human body cannot be influenced, and the method is very suitable for detecting the bottom of the petroleum storage tank.

At present, the ultrasonic thickness measuring device of ordinary pressure storage tank commonly used in industrial production is hand-held type usually, and hand-held type ultrasonic thickness gauge has advantages such as convenient to use, portable, nevertheless needs the human body to get into in the jar during the detection, if the measure of ventilating is improper, can have harmful gas, forms the hidden danger to human safety.

Disclosure of Invention

In order to detect the bottom plate of a small-sized and experimental atmospheric storage tank more safely and conveniently, the invention provides an ultrasonic-based crude oil and LNG storage tank bottom plate detection experimental device which has the advantages of stable and firm clamping, convenient probe movement, high safety and the like when the thickness of the bottom plate is measured by a storage tank.

The technical scheme adopted by the invention for solving the technical problems is as follows: an ultrasonic wave-based crude oil and LNG storage tank bottom plate detection experimental device, in a space rectangular coordinate system with X, Y, Z axes as coordinate axes, comprises:

the probe lifting mechanism can enable the probe to move along the Z-axis direction;

the horizontal moving mechanism can enable the probe lifting mechanism and the probe to move along the X-axis direction and the Y-axis direction;

the test bed base can be used for placing and fixing the storage tank to be tested.

The test bench base is recess column structure, and the test bench base contains the first upper flat plate, first riser, bottom plate, second riser and the second upper flat plate that connect gradually, and the upper surface of first upper flat plate and the upper surface of second upper flat plate are located same horizontal plane, and the storage tank that awaits measuring can be located between first riser and the second riser.

The test bed base still contains the fixture who is used for the fixed storage tank that awaits measuring of centre gripping, fixture contains the centre gripping piece and the cylinder that connect gradually, and the cylinder is connected with first riser and second riser one-to-one, and the centre gripping piece is convex structure, and the central angle that the centre gripping piece corresponds is 90.

Horizontal migration mechanism contains first X axle lead screw and second X axle lead screw, and first X axle lead screw and second X axle lead screw all are parallel with the X axle, and the both ends of first X axle lead screw are connected through first lead screw base and first upper flat plate, and dull and stereotyped connection is gone up through second lead screw base and second in the both ends of second X axle lead screw, and the one end of first X axle lead screw is connected with X axle motor, and first X axle lead screw and second X axle lead screw all overlap outward and are equipped with ball nut.

The horizontal movement mechanism further comprises a Y-axis lead screw and a Y-axis bridge, the Y-axis lead screw and the Y-axis bridge are parallel to the Y axis, one end of the Y-axis lead screw is connected with a Y-axis motor, the other end of the Y-axis lead screw is connected with a third lead screw base, the Y-axis motor is fixedly connected with a ball nut sleeved on the first X-axis lead screw, and the third lead screw base is fixedly connected with a ball nut sleeved on the second X-axis lead screw.

The Y-axis bridge frame and the Y-axis lead screw are arranged up and down, the section of the Y-axis bridge frame is in a T shape, one end of the Y-axis bridge frame is fixedly connected with a ball nut sleeved on the first X-axis lead screw through an L-shaped supporting plate, and the other end of the Y-axis bridge frame is fixedly connected with a ball nut sleeved on the second X-axis lead screw through another L-shaped supporting plate.

The probe lifting mechanism comprises a Z-axis lead screw, a lifting base and a Z-axis motor, the Z-axis lead screw is parallel to a Z axis, the Z-axis lead screw and a Y-axis lead screw penetrate through the lifting base, the lifting base is connected with a Y-axis bridge in a matching mode, and the Z-axis motor can drive the Z-axis lead screw to move along the Z axis direction.

Promote the middle part top of base and be equipped with T shape recess, this T shape recess and Y axle bridge accordant connection promote one side of base and be equipped with the first backup pad and the first backup pad of going up that set up from top to bottom, and Z axle feed screw passes first backup pad and the first backup pad of going up.

Promote the opposite side of base and be equipped with the backup pad on the second, backup pad symmetry setting is gone up to backup pad and second on first, the top of promoting the base is connected with motor support plate, Z axle motor is connected fixedly with motor support plate, Z axle motor loops through pinion and gear wheel and is connected with Z axle feed screw, outside Z axle feed screw was located to the gear wheel cover, gear wheel and Z axle feed screw threaded connection, the gear wheel is located first between backup pad and the motor support plate of going up.

The probe lifting mechanism further comprises a fine adjustment motor, a fine adjustment gear and a fine adjustment rack which are sequentially connected, the fine adjustment rack is parallel to the Z-axis lead screw, the lower end of the Z-axis lead screw is connected with an installation flat plate, the fine adjustment rack penetrates through the installation flat plate, the probe is fixed at the lower end of the fine adjustment rack, the fine adjustment motor is fixed on the installation flat plate, and the fine adjustment motor can drive the fine adjustment rack to move along the Z-axis direction.

The invention has the beneficial effects that:

1. compared with the existing storage tank bottom plate detection technology, the ultrasonic detection technology has the advantages of high precision, stability, convenience and no adverse effect on people and environment. The technical scheme of the invention completely solves the problem, has safe operation environment and does not need human body to enter the tank bottom. The detection probe is convenient to control, high in detection speed, high in efficiency, free of a large amount of manual work and high in automation degree, and is very suitable for detection of the bottom of a laboratory storage tank and an industrial micro storage tank.

2. The invention can be suitable for detecting the miniature storage tanks in factories and gas stations, can be extended to institutions such as universities and research institutes to detect experimental storage tank bottom plates, and has certain practical significance.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

FIG. 1 is a schematic view of a test stand base according to the present invention.

Fig. 2 is a schematic view of the horizontal movement mechanism of the present invention.

FIG. 3 is a schematic view of the probe lift mechanism of the present invention.

10. A test bed base; 20. a horizontal movement mechanism; 30. a probe lifting mechanism; 40. a storage tank to be tested;

11. a first upper plate; 12. a first vertical plate; 13. a base plate; 14. a second vertical plate; 15. a second upper plate; 16. a clamping piece; 17. a cylinder;

21. a first X-axis lead screw; 22. a second X-axis lead screw; 23. an X-axis motor; 24. a Y-axis lead screw; 25. a Y-axis bridge frame; 26. a Y-axis motor; 27. a third lead screw base;

31. a probe protection cover; 32. a probe; 33. fine-tuning the gear; 34. finely adjusting the rack; 35. fine tuning a motor; 36. a Z-axis lead screw; 37. lifting the base; 38. a bull gear; 39. a Z-axis motor; 310. a motor bracket plate; 311. installing a flat plate;

371. a first upper support plate; 372. a first lower support plate; 373. a second upper support plate; 374. a T-shaped groove; 375. a horizontal threaded through hole.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

In a spatial rectangular coordinate system taking an X, Y, Z axis as a coordinate axis, the ultrasonic-based crude oil and LNG storage tank bottom plate detection experimental device comprises a test bed base 10, a horizontal moving mechanism 20 and a probe lifting mechanism 30, wherein the probe lifting mechanism 30 can enable a probe 32 to move along the Z-axis direction; the horizontal movement mechanism 20 can move the probe elevation mechanism 30 and the probe 32 in the X-axis and Y-axis directions; the test stand base 10 is capable of placing and securing a tank 40 to be tested as shown in fig. 1-3.

The rectangular spatial coordinate system corresponds to the real world, the plane of the X-axis and the Y-axis is a horizontal plane, and the Z-axis direction is a vertical direction, that is, the probe lifting mechanism 30 can move the probe 32 up and down in the vertical direction, the horizontal movement mechanism 20 can move the probe lifting mechanism 30 and the probe 32 in the horizontal plane along the X-axis, or the horizontal movement mechanism 20 can move the probe lifting mechanism 30 and the probe 32 in the horizontal plane along the Y-axis, or the horizontal movement mechanism 20 can move the probe lifting mechanism 30 and the probe 32 in the horizontal plane along the X-axis and the Y-axis.

In this embodiment, the test bed base 10 is a groove-shaped structure, the test bed base 10 includes a first upper flat plate 11, a first vertical plate 12, a bottom plate 13, a second vertical plate 14 and a second upper flat plate 15, which are connected in sequence, the upper surface of the first upper flat plate 11 and the upper surface of the second upper flat plate 15 are located on the same horizontal plane, the first vertical plate 12 is parallel to the second vertical plate 14, and the storage tank 40 to be tested can be located between the first vertical plate 12 and the second vertical plate 14, as shown in fig. 1.

The base 10 of the test bed is made of Q235 carbon steel plates through welding, the intersection line of the first upper flat plate 11 and the first vertical plate 12 is parallel to an X axis, the intersection line of the first vertical plate 12 and the bottom plate 13 is parallel to the X axis, the intersection line of the bottom plate 13 and the second vertical plate 14 is parallel to the X axis, and the intersection line of the second vertical plate 14 and the second upper flat plate 15 is parallel to the X axis. Reinforcing ribs are arranged between the first upper flat plate 11 and the first vertical plate 12, and reinforcing ribs are arranged between the second upper flat plate 15 and the second vertical plate 14.

In this embodiment, the test bed base 10 further includes two clamping mechanisms for clamping and fixing the storage tank 40 to be tested, the two clamping mechanisms are mirror images of each other, and the two clamping mechanisms are connected with the first vertical plate 12 and the second vertical plate 14 in a one-to-one correspondence manner. Specifically, fixture contains the clamping piece 16 and the cylinder 17 that connect gradually, and cylinder 17 is connected with first riser 12 and second riser 14 one-to-one, and clamping piece 16 is convex structure, and the central angle that clamping piece 16 corresponds is 90. When the air cylinder 17 is actuated, the gripping pieces 16 of the two gripping mechanisms can move toward or away from each other.

The air cylinder 17 is of an SC63 type, a cylinder barrel of the air cylinder 17 is fixedly connected with the first vertical plate 12 and the second vertical plate 14 through bolts, a piston rod of the air cylinder 17 is fixedly connected with the clamping piece 16 through a projection, and the projection is located on the outer surface of the clamping piece 16. The clamping piece 16 is made of elastic material 65Mn with good rigidity, and when the storage tank 40 to be tested is firmly clamped, the detection damage caused by the fact that the material of the clamping piece is too hard to scratch the surface of the storage tank can be avoided. The cross section of the holding piece 16 along the horizontal direction is in the shape of a circular arc with the diameter of 400mm, and the size is consistent with the outer diameter of the storage tank.

In this embodiment, the horizontal moving mechanism 20 includes a first X-axis lead screw 21 and a second X-axis lead screw 22, the axis of the first X-axis lead screw 21 and the axis of the second X-axis lead screw 22 are both parallel to the X axis, both ends of the first X-axis lead screw 21 are both connected to the first upper flat plate 11 through the first lead screw base, both ends of the second X-axis lead screw 22 are both connected to the second upper flat plate 15 through the second lead screw base, one end of the first X-axis lead screw 21 is connected to an X-axis motor 23 through a coupling, and both the first X-axis lead screw 21 and the second X-axis lead screw 22 are externally sleeved with ball nuts, as shown in fig. 2.

In this embodiment, the horizontal moving mechanism 20 further includes a Y-axis screw 24 and a Y-axis bridge 25, the axis of the Y-axis screw 24 and the center line of the Y-axis bridge 25 are both parallel to the Y-axis, one end of the Y-axis screw 24 is connected with a Y-axis motor 26, the other end of the Y-axis screw 24 is connected with a third screw base 27, the Y-axis motor 26 is vertically connected and fixed with a ball nut sleeved on the first X-axis screw 21, and the third screw base 27 is vertically connected and fixed with a ball nut sleeved on the second X-axis screw 22.

In this embodiment, the Y-axis bridge 25 and the Y-axis lead screw 24 are disposed up and down, the cross section of the Y-axis bridge 25 is T-shaped, one end of the Y-axis bridge 25 is connected and fixed to a ball nut sleeved on the first X-axis lead screw 21 through an L-shaped support plate, and the other end of the Y-axis bridge 25 is connected and fixed to a ball nut sleeved on the second X-axis lead screw 22 through another L-shaped support plate, as shown in fig. 2.

The probe lifting mechanism 30 is provided on the Y-axis screw 24 and the Y-axis bridge 25, and when the output shaft of the X-axis motor 23 rotates, the first X-axis screw 21 rotates, the Y-axis screw 24 and the Y-axis bridge 25 move in the X-axis direction, and the second X-axis screw 22 rotates. When the output shaft of the Y-axis motor 26 rotates, the Y-axis screw 24 is rotated, and the probe elevation mechanism 30 and the probe 32 are both moved in the Y-axis direction.

In this embodiment, the probe lifting mechanism 30 includes a Z-axis lead screw 36, a lifting base 37 and a Z-axis motor 39, the Z-axis lead screw 36 is parallel to the Z-axis, the Z-axis lead screw 36 and the Y-axis lead screw 24 both pass through the lifting base 37, the lifting base 37 is connected with the Y-axis bridge 25 in a matching manner, and the Z-axis motor 39 can drive the Z-axis lead screw 36 to move along the Z-axis direction. Preferably, the Z-axis lead screw 36 is a national standard trapezoidal lead screw Tr 12X 3.

In this embodiment, a T-shaped groove 374 is disposed above the middle of the lifting base 37, the T-shaped groove 374 is matched with the Y-axis bridge 25 for plugging, a horizontal thread through hole 375 is disposed in the middle of the lifting base 37, the Y-axis screw 24 passes through the horizontal thread through hole 375, a first upper support plate 371 and a first lower support plate 372 are disposed on one side of the lifting base 37, the Z-axis screw 36 passes through the first upper support plate 371 and the first lower support plate 372, circular hollow bosses are disposed on the first upper support plate 371 and the first lower support plate 372, and the Z-axis screw 36 is in threaded fit with the circular hollow bosses on the first upper support plate 371 and the first lower support plate 372.

In this embodiment, the other side of the lifting base 37 is provided with a second upper supporting plate 373, the first upper supporting plate 371 and the second upper supporting plate 373 are symmetrically arranged on two sides of the T-shaped groove 374, the motor support plate 310 is connected above the lifting base 37, the Z-axis motor 39 is fixedly connected with the motor support plate 310, the Z-axis motor 39 is connected with the Z-axis screw rod 36 sequentially through a pinion and a bull gear 38, the bull gear 38 is sleeved outside the Z-axis screw rod 36, a central through hole is formed in the bull gear 38, an internal thread is formed in the central through hole, the bull gear 38 is in threaded connection with the Z-axis screw rod 36, and the bull gear 38 is located between the first upper supporting plate 371 and the motor support plate 310, as shown.

Motor mounting panel 310 is the rectangle structure, and four angles of motor mounting panel 310 all are equipped with the cylinder stabilizer blade, the cylinder stabilizer blade and the promotion base 37 welded fastening at four angles, and motor mounting panel 310 is passed to Z axle lead screw 36, and Z axle lead screw 36 and motor mounting panel 310 threaded connection. When the output shaft of the Z-axis motor 39 rotates, the Z-axis lead screw 36 can be moved in the Z-axis direction by the transmission of the pinion gear and the bull gear 38.

In this embodiment, the probe lifting mechanism 30 further includes a fine adjustment motor 35, a fine adjustment gear 33 and a fine adjustment rack 34, which are connected in sequence, the fine adjustment rack 34 is parallel to the Z-axis lead screw 36, that is, the length direction of the fine adjustment rack 34 is parallel to the Z-axis direction, the lower end of the Z-axis lead screw 36 is connected to a mounting plate 311, the fine adjustment rack 34 passes through the mounting plate 311, the probe 32 is fixed to the lower end of the fine adjustment rack 34, the probe 32 is an existing ultrasonic probe, a probe protection cover 31 is arranged outside the probe 32, the fine adjustment motor 35 is fixed to the mounting plate 311, and the fine adjustment motor 35 can drive the fine adjustment rack 34 to move along the Z-axis direction, so that the. The rough adjustment and the fine adjustment are coordinated, and the position of the probe in the vertical direction can be well controlled. Because the built-in probe protection cover plays a certain protection role to the probe.

This crude oil and LNG storage tank bottom plate based on ultrasonic wave detects experimental apparatus can be convenient detect the bottom plate to small-size and experiment type ordinary pressure storage tank, small-size storage tank and experiment type storage tank are generally applied to needs a small amount of crude oil places of temporary storage such as filling station, scientific research laboratory, and this common volume 1m of small-size storage tank and experiment type storage tank³-30m³The diameter is 0.5m-3m, the height is 1m-3m, and the height can be adjusted according to the requirement.

The working process of the ultrasonic-based crude oil and LNG storage tank bottom plate detection experimental device is described below.

During detection, the storage tank 40 to be detected is placed in the middle of the test bed base 10, the clamping mechanisms on the two sides are opened, and the clamping pieces 16 are arc-shaped, so that the automatic centering function is achieved, and the storage tank 40 to be detected is fixed in the middle of the experimental device.

After fixing, the horizontal movement mechanism 20 is opened, the ball nut has high precision and high stability, the position accuracy can be maintained in the operation process, and the vibration problem of the probe cannot be caused. When the probe reaches the upper part of the detection point, the probe lifting mechanism 30 is started, the probe 32 is sent to the position near the designated detection position, the fine adjustment mechanism is started, and the probe 32 reaches the accurate detection point under the driving of the fine adjustment motor 35. And carrying out ultrasonic detection on the bottom plate of the storage tank, sending detection data to an upper computer, and carrying out tank bottom thickness detection, defect and corrosion degree analysis, risk assessment and repair method determination.

The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features and the technical schemes, and the technical schemes can be freely combined and used.