CN105158344B - Storage tank bottom plate corrodes built-in acoustic emission detection system - Google Patents

Abstract

The present invention relates to storage tank bottom plate to corrode built-in acoustic emission detection system,This storage tank bottom plate corrosion acoustic emission detection system includes motor,Disk line car,Straightener,Oil removing mechanism,Acoustic emission sensor,Depth gauge,Motor via reducer structure connects active roll,Oil removing mechanism is fixed under support,Positioned at the lower section of active roll,Active roll is arranged on the bottom of straightener,Disk line car is arranged on the side of straightener,The signal cable of outsourcing aluminium-plastic pipe is wrapped on the disk line roller of disk line car,Signal cable top connects capture card,After aluminium-plastic pipe is around the directive wheel of straightener,Passed through between the smoothing roll of straightener,Again successively between active roll,Passed in oil removing mechanism,Signal cable end is by being connected to the two-way elbow of aluminium-plastic pipe,It is connected with the acoustic emission sensor in sensor box,The opposite side connection depth gauge of two-way elbow.The present invention solves the problems, such as easily occur that tank center region acoustic emission signal is faint, is easy to miss inspection.

Description

Storage tank floor corrosion built-in acoustic emission detection device

technical field

The invention relates to a device for detecting storage tanks, in particular to a built-in acoustic emission detection device for storage tank bottom plate corrosion.

Background technique

The traditional acoustic emission tank floor detection technology is to couple the acoustic emission sensor to the tank wall to be inspected for passive listening, and then transmit the signal to the external acoustic emission instrument through the transmission cable for data processing by the host computer. Because the corrosion signal propagation path of the tank bottom plate passes through the crude oil to the tank wall, and then is received by the acoustic emission sensor, the signal is mixed with a lot of noise signals. At the same time, due to the relatively limited environment, the multipath effect also has a great impact on the received signal, so in this case, it is a great obstacle to accurately locate the corrosion area. Especially for the health monitoring of corrosion damage on the bottom plate of large storage tanks, it is prone to the problem of weak acoustic emission signal in the central area and easy missed detection.

Contents of the invention

The object of the present invention is to provide a storage tank bottom plate corrosion acoustic emission detection device, which is used to solve the problem that the traditional acoustic emission tank bottom plate detection technology may have a weak acoustic emission signal in the center area and is easy to miss.

The technical solution adopted by the present invention to solve the technical problem is: the storage tank floor corrosion acoustic emission detection device includes a motor, a wire coiler, a straightening machine, an oil removal mechanism, an acoustic emission sensor, and a depth gauge, and the motor is installed on the bracket , the motor is connected to the driving roller through the reduction mechanism, the degreasing mechanism is fixed under the bracket, the degreasing mechanism is located under the driving roller, the driving roller is installed at the lower part of the straightening machine, and the coiling car is set on the side of the straightening machine. The signal cable wrapped with aluminum-plastic tube is wound on the coiling roller of the coiler, and the beginning of the signal cable is connected to the acquisition card. After the aluminum-plastic tube bypasses the guide wheel of the straightener, it passes between the straightening rollers of the straightener. After that, pass through the driving rollers and the degreasing mechanism in turn. The end of the signal cable is connected to the acoustic emission sensor located in the sensor box through the two-way elbow connected to the aluminum-plastic pipe. The other side of the two-way elbow Connect the depth gauge.

In the above scheme, the degreasing mechanism includes an outer cylinder. Both ends of the outer cylinder have outer edges. The upper port of the outer cylinder is fixed with a ring-shaped spray pipe. On the plastic pipe, the brushes are evenly distributed on the inner wall of the outer cylinder, the oil scraper is installed at the lower part of the outer cylinder, the brush is located between the spray pipe and the oil scraper, the spray pipe is connected to the self-priming pump, and the self-priming pump is connected to the oil storage tank; The oil scraper is composed of an oil scraper box, a sealing ring, a sealing box, an oil scraper ring, a positioning sleeve, and a gland. The oil scraper box is a cylindrical body with an open end, the open end has an outer edge, and the top of the oil scraper box has a central hole. , the sealing box buckles the sealing ring on the top of the oil scraping box, the sealing ring is located at the center hole, the sealing box also has a center hole, the positioning sleeve is located between the gland and the sealing box, the center of the positioning sleeve has an oil scraping ring, the gland, The outer edge of the oil scraping box and the outer cylinder are fixed by bolts.

In the above scheme, the straightening machine is composed of a chassis, a guide wheel, a straightening roller, and an adjustment mechanism. The guide wheel is installed on the upper end of the chassis, and the straightening rollers are arranged in pairs under the guide wheel. One of each pair of straightening rollers is fixed on the chassis. On the top, another straightening roller is connected with the adjusting hand wheel installed on the side of the machine case.

The present invention has the following beneficial effects:

1. The present invention penetrates the acoustic emission sensor into the storage tank, forms an array with the sensors arranged on the outer wall of the storage tank, and jointly monitors the corrosion damage of the bottom plate of the storage tank, increases the area coverage area, reduces external interference, improves the sensitivity of detection and the reliability of monitoring It can evaluate the corrosion damage of the bottom plate of the storage tank more effectively; the acoustic emission detection sensor array method of the storage tank is used to monitor the corrosion damage of the bottom plate of the large storage tank, which solves the problem that the acoustic emission signal in the central area of the storage tank is weak and easy to miss. question.

2. In the present invention, the degreasing mechanism uses degreasing agent to degrease, two-step degreasing of oil scraping ring, removes crude oil, and protects the device; degreasing agent degreasing is realized by the joint cooperation of degreasing agent and hair brush, Thorough cleaning and high cleaning efficiency.

3. In the present invention, the driving roller is driven by the motor and the deceleration mechanism, and the two wheels cooperate to drive the aluminum-plastic pipe to realize the automatic lifting of the aluminum-plastic pipe, reduce manual operation, and realize automation.

4. The present invention organically combines straightening, signal cable and acoustic emission sensor to collect data and degreasing. The acoustic emission sensor can be placed at a certain position on the inner bottom plate of the storage tank, and cooperate with the present invention on the outer wall of the storage tank. The arranged sensor array jointly monitors the corrosion state of the bottom plate of the storage tank, and the oil stained on the aluminum-plastic pipe wall is removed through the degreasing mechanism. The detection is sensitive, reliable, convenient and easy.

Description of drawings

Fig. 1 is the front view of the present invention;

Fig. 2 is a side view of the present invention;

Fig. 3 is a top view of the present invention;

Fig. 4 is the schematic diagram of regulating mechanism among the present invention;

Fig. 5 is M-M sectional view among Fig. 4;

Fig. 6 is the schematic diagram of degreasing mechanism in the present invention;

Fig. 7 is F-F sectional view among Fig. 6;

Fig. 8 is a schematic structural view of an oil scraper in the present invention;

Fig. 9 is a schematic diagram of the driving roller in the present invention.

In the figure: 1 motor; 2 straightening machine; 3 degreasing mechanism; 4 acoustic emission sensor; 5 depth gauge; 6 bracket; Tube; 12 brush; 13 self-priming pump; 14 oil storage tank; 15 scraper box; 16 sealing ring; 17 seal box; 18 scraper ring; 19 positioning sleeve; 20 gland; Hand wheel; 24 straightening roller; 25 aluminum-plastic tube; 26 sensor box; 27 fixing piece; 28 valve seat.

Detailed ways

Below in conjunction with accompanying drawing, the present invention will be further described:

As shown in Fig. 1, Fig. 2 and Fig. 3, this storage tank floor corrosion acoustic emission detection device includes a motor 1, a wire coiler 8, a straightening machine 2, an oil removal mechanism 3, an acoustic emission sensor 4, and a depth gauge 5. The motor 1 is installed on the bracket 6, the motor 1 is a three-phase cage asynchronous motor, the motor 1 is connected to the driving roller 7 through the reduction mechanism, the degreasing mechanism 3 is fixed under the bracket 6, and is located under the driving roller 7, after straightening The aluminum-plastic pipe 25 vertically enters the degreasing mechanism 3 after the driving roller 7, the driving roller 7 is installed on the bottom of the straightening machine 2, the driving roller 7 is shown in Figure 9, and the coiler 8 is arranged on the straightening On the side of the machine 2, the signal cable of the outsourcing aluminum-plastic tube 25 is wound on the coiling roller 9 of the coiler 8, and the beginning of the signal cable is connected to the acquisition card, and the roller of the coiler 8 is stuck on the bracket 6, which can be rotated by hand Realize the retracting and unwinding of the aluminum-plastic pipe 25 (the coiler can also be driven by the motor) to speed up the progress of the experiment; Pass through, and then pass through the driving roller 7 and the degreasing mechanism 3 in sequence. The end of the signal cable passes through the bidirectional elbow connected to the aluminum-plastic pipe 25, and is connected with the acoustic emission sensor 4 located in the sensor box 26, bidirectional One side of the elbow is connected to a sensor box 26 which has undergone explosion-proof treatment, and the other side of the two-way elbow is connected to the depth gauge 5 . In the present invention, each component lowered into the storage tank needs to be subjected to explosion-proof treatment using known techniques. The motor 1 drives the driving roller 7 to rotate, and the acoustic emission sensor 4 and the depth gauge 5 are lowered to the bottom of the storage tank for detection, and after the detection is completed, the acoustic emission sensor 4 and the depth gauge 5 are lifted out of the storage tank.

Referring to Fig. 6, shown in Fig. 7, degreasing mechanism 3 comprises outer cylinder 10, and the two ends of outer cylinder 10 all have outer edges, and the lower port of outer cylinder 10 is fixed ring-shaped spray pipe 11, and spray pipe wall is perforated, from The degreasing agent sprayed from the spray pipe 11 is sprayed onto the aluminum-plastic pipe 25 passing through the outer cylinder 10, and the aluminum-plastic pipe 25 is cleaned of oil. Pipe 11 cooperates, and the aluminum-plastic pipe 25 that has sprayed degreasing agent is brushed immediately, can effectively remove the oil that is stained with on the aluminum-plastic pipe 25. The oil scraper is installed on the lower part of the outer cylinder 10, the brush 12 is located between the spray pipe 11 and the oil scraper, the spray pipe 11 is connected to the self-priming pump 13, the self-priming pump 13 is connected to the oil storage tank 14, and the self-priming pump 13 is selected to be small Suction pump BSP-S series; refer to Figure 8, the oil scraper is composed of oil scraper box 15, sealing ring 16, sealing box 17, oil scraper ring 18, positioning sleeve 19, gland 20, and oil scraper box 15 is an open end Cylindrical body, the open end has an outer edge, the box top of the oil scraping box 15 has a central hole, the sealing box 17 buckles the sealing ring 16 on the box top of the oil scraping box 15, the sealing ring 16 is located at the center hole, and the sealing box 17 also has a center hole, the positioning sleeve 19 is located between the gland 20 and the sealing box 17, and the center of the positioning sleeve 19 has an oil wiper ring 18, and the gland 20, the outer edge of the oil scraper box 15, and the outer edge of the outer cylinder 10 are fixed by bolts.

After the detection is completed, the aluminum-plastic pipe 25 is extracted from the storage tank, and the outer wall surface is covered with crude oil, which should be recycled. The crude oil still adhering to the outer wall of the pipe after recovery and treatment is not easy to clean. If not treated, it will pollute the device, which is not convenient for transportation and secondary use, and will corrode the device. Therefore, the present invention designs a set of degreasing device to remove crude oil and protect the device. Divided into two steps of degreasing, one, oil scraping ring 18 degreasing, and second, degreasing agent degreasing. Oil scraper ring 18 degreasing belongs to the first step of oil removal, which removes most of the crude oil outside the pipe and recycles it. Through the cooperation of oil scraper ring 18 and sealing ring 16, the crude oil on the outer wall of the pipe is removed to prevent it from entering the device. The degreasing agent degreasing mainly realizes this operation by the cooperation of the degreasing agent and the hairbrush 12 . The degreasing agent is sprayed to the center through the ring nozzle, which is installed on the inner side of the ring and distributed evenly. The degreasing agent is circulated through the circulation pump.

Straightening machine 2 is made up of cabinet 21, guide wheel 22, straightening roller 24, adjustment mechanism, and guide wheel 22 is installed on the upper end of cabinet 21, and straightening roller 24 is arranged in pair below guide wheel 22, and every pair of straightening roller 24 One of them is fixed on the cabinet 21, and the other straightening roller 24 is connected with the adjusting hand wheel 23 installed on the side of the cabinet 21, and the aluminum-plastic pipe 25 is straightened by relying on the concave angle change in the middle of the two rollers. There are three pairs of straightening rollers 24 in the present embodiment, six straightening rollers 24 three a row, totally two rows, wherein one row is fixed, and each straightening roller 24 in the other row is all connected with the adjustment hand wheel 23 connect. The adjustment mechanism is shown in Figure 4 and Figure 5. The adjustment mechanism is composed of a valve seat, an adjustment rod, a fixing piece, and an adjustment handwheel 23. The valve seat is fixed on the casing 21, and the fixing piece is fixed on the valve seat. The adjustment rod and the fixing piece Threaded connection, the adjustment rod passes through the valve seat and is fixed together with the adjustment hand wheel 23, and the rotation motion is changed into a linear motion through the straightener 2, that is, the operating torque is changed into an operation thrust, and the adjustment hand wheel 23 rotates to drive the adjustment The rod moves, causing the straightening rollers 24 to move. Fine-tuning can be carried out to change the direction of the aluminum-plastic pipe 25 and improve the straightness.

The method for detecting the corrosion of the storage tank bottom plate by the storage tank bottom plate corrosion built-in acoustic emission detection device;

1. Installation process: Firstly, put the signal cable into the aluminum-plastic tube 25, reserve the terminal, then wind the aluminum-plastic tube 25 on the coiler 8; extend the aluminum-plastic tube 25 into the straightening machine 2 Inside, through the degreasing mechanism 3, pre-adjustment is performed, the position between the straightening rollers 24 is changed by adjusting the hand wheel 23, and the pipe wall of the aluminum-plastic pipe 25 is clamped. Finally, the acoustic emission sensor 4 and the depth gauge 5 are installed, the acoustic emission sensor 4 is connected with the signal cable, put into the sensor box 26, and fixed, the sensor box 26 is connected with the two-way elbow, and the other side of the two-way elbow is connected with the depth gauge 5. In order to cooperate with the present invention, it is required that the outer wall of the storage tank is close to the bottom plate, and a ring of acoustic emission sensors is evenly distributed at the same height.

2. Decentralization process: After the device has been debugged, it is ready to start detection, turn on the power, start the motor 1, the driving roller 7 drives the aluminum-plastic pipe 25 to go down, and the sensor box 26 starts to move downward, so as to determine the vertical position of the acoustic emission sensor 4 placed. Displacement, through the acoustic material characteristic matrix test, determine the horizontal position and sensitivity of the dropped acoustic emission sensor, finally reach the predetermined position, and start detection;

3. Recovery process: After the data collection is completed, turn on the self-priming pump 13, spray the degreasing agent, and activate the sensor through the hand-operated device.

Claims (2)

1. a kind of storage tank bottom plate corrodes built-in acoustic emission detection system, it is characterised in that：This storage tank bottom plate corrodes sound emission Detection means includes motor（1）, disk line car（8）, straightener（2）, oil removing mechanism（3）, acoustic emission sensor（4）, depth gauge （5）, motor（1）Installed in support（6）On, motor（1）Active roll is connected by reducing gear（7）, oil removing mechanism（3）It is fixed In support（6）Under, oil removing mechanism（3）Positioned at active roll（7）Lower section, active roll（7）Installed in straightener（2）Under Portion, disk line car（8）It is arranged on straightener（2）Side, outsourcing aluminium-plastic pipe（25）Signal cable be wrapped in disk line car（8）Disk Line roller（9）On, signal cable top connection capture card, aluminium-plastic pipe（25）Around straightener（2）Directive wheel（22）Afterwards, from aligning Machine（2）Smoothing roll（24）Between pass through, then successively from active roll（7）Between, oil removing mechanism（3）In pass, signal cable end By being connected to aluminium-plastic pipe（25）Two-way elbow, and positioned at sensor box（26）Interior acoustic emission sensor（4）It is connected, it is two-way The opposite side connection depth gauge of elbow（5）;Oil removing mechanism（3）Including outer barrel（10）, outer barrel（10）Both ends Jun You outward flanges, Outer barrel（10）Upper port stationary annular shower（11）, from shower（11）The degreaser of ejection is ejected into from outer barrel（10）In The aluminium-plastic pipe passed through（25）On, hairbrush（12）It is distributed on outer barrel（10）On inwall, oil wiper is arranged on outer barrel（10）Bottom, hair Brush（12）Positioned at shower（11）Between oil wiper, shower（11）Connect self priming pump（13）, self priming pump（13）Connect oil storage Case（14）；Oil wiper is by scraping oil box（15）, sealing ring（16）, seal box（17）, oil-scraping ring（18）, positioning sleeve（19）, gland （20）Form, scrape oil box（15）For the cylindrical body with open end, open end has outward flange, scrapes oil box（15）Box top have Centre bore, seal box（17）By sealing ring（16）It is buckled in and scrapes oil box（15）Box top, sealing ring（16）Positioned at central hole, sealing Box（17）Also there are centre bore, positioning sleeve（19）Positioned at gland（20）With seal box（17）Between, positioning sleeve（19）There is frizing at center Ring（18）, gland（20）, scrape oil box（15）Outward flange, outer barrel（10）Outward flange is bolted.

2. storage tank bottom plate according to claim 1 corrodes built-in acoustic emission detection system, it is characterised in that：Described rectifys Straight machine is by cabinet（21）, directive wheel（22）, smoothing roll（24）, governor motion composition, directive wheel（22）Installed in cabinet（21）'s Upper end, smoothing roll（24）In to being arranged on directive wheel（22）Lower section, each pair smoothing roll（24）In one be fixed on cabinet（21） On, another smoothing roll（24）With installed in cabinet（21）The adjusting handle of side（23）Connection.