Spraying device for corrosion-resistant coating of tube bundle for power plant boiler maintenance

Abstract

The invention discloses a spraying device for a corrosion-resistant coating of a tube bundle for maintenance of a power plant boiler, and relates to the technical field of spraying of the corrosion-resistant coating of the tube bundle, the spraying device comprises a spraying rod, a connecting rod fixedly connected with the spraying rod and a nozzle in threaded connection with the connecting rod, and further comprises a detection assembly, and the detection assembly comprises a liquid cylinder arranged above the connecting rod; the communicating pipe is fixedly connected with the liquid cylinder, a liquid outlet is formed in the position, close to the bottom, of the communicating pipe, and the communicating pipe is slidably connected with the connecting rod. Through linkage of the pressing plate and the indicating rod, flow change is converted into visual position change, interference of a complex flow channel structure on a detection result is reduced, the flow channel structure adaptability, working condition compatibility and anti-interference capacity are higher, negative requirements directly generated by contact type measurement are avoided, and the detection accuracy is improved. And the requirements of complex environment and rapid screening of a power plant boiler maintenance site are met.

Description

Technical Field

[0001] The present invention relates to the technical field of spraying of wear-resistant coatings for tube rows, and specifically to a spraying device for corrosion-resistant coatings of tube rows used in power plant boiler maintenance. Background Art

[0002] When spraying corrosion-resistant coatings for tube rows used in power plant boiler maintenance, supersonic flame spraying is widely used due to its significant advantages. However, the spray gun nozzle is easily eroded and worn by high-temperature alloy powder, resulting in an increase in the nozzle diameter, which causes airflow disorder and affects the coating uniformity. Therefore, the detection of the inner diameter of the nozzle is crucial. At present, the detection methods for the wear of the inner diameter of the nozzle of the spraying device mainly include contact measurement and flow sensor detection, etc. Contact measurement (such as internal diameter micrometers, plug gauges) has high accuracy, but it needs to operate after disassembling the nozzle, which has problems of low detection efficiency and complex operation. Moreover, frequent disassembly is likely to cause damage to the nozzle and related components, affecting the equipment sealing performance and spraying accuracy. In addition, for the complex environment (dust and oil interference, space limitation) at the power plant boiler maintenance site, contact measurement is difficult to meet the requirements of on-site rapid screening and needs to be sent to a specific monitoring point.

[0003] The method of using a flow sensor to detect the nozzle flow rate in real time to judge wear, although it has the potential for on-line monitoring, faces many technical bottlenecks in practical applications. On the one hand, during the spraying process of the power plant boiler, the inner flow channel of the nozzle is in a harsh working condition of high temperature (800 - 1500 °C) and multiphase flow (gas and powder mixture), and ordinary flow sensors are difficult to adapt to such an environment. On the other hand, there are often irregular structures such as steps and tapers inside the nozzle. During the spraying process, the interaction between the airflow and the powder easily causes irregular fluctuations in the flow rate data, making it difficult for the sensor to distinguish whether the flow rate change is caused by wear inside the nozzle or by the different shapes of the inner diameter flow channel of the nozzle. The detection error is large and the algorithm calibration is difficult. Therefore, the flow sensor detection method has problems of low reliability, high cost, and poor adaptability in practical engineering applications. Summary of the Invention

[0004] The purpose of the present invention is to provide a spraying device for corrosion-resistant coatings of tube rows used in power plant boiler maintenance to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A spraying device for corrosion-resistant coatings of tube rows used in power plant boiler maintenance, including a spray rod, a connecting rod fixedly connected to the spray rod, and a nozzle threadedly connected to the connecting rod. It further includes a detection component, and the detection component includes: A liquid cylinder, arranged above the connecting rod; A connecting pipe, fixedly connected to the liquid cylinder and having a liquid outlet at a position near its bottom. The connecting pipe is slidably connected to the connecting rod; A seal is rotatably connected inside the liquid cylinder, and a first torsion spring is sleeved on its rotating shaft; A locking assembly is used to lock the seal; A pressure plate is slidably connected inside the liquid cylinder through a fixed rod, and a first spring is fixedly connected between the pressure plate and the inner wall of the liquid cylinder; An indicating rod is fixedly connected to the bottom of the fixed rod; A benchmark is arranged above the connecting rod and there is a spacing between the benchmark and the indicating rod; A dynamic adjustment assembly is used to make the horizontal spacing between the benchmark and the indicating rod smaller when the first spring is stretched; A driving assembly is used to control the sliding of the connecting pipe inside the connecting rod. When the liquid outlet drops into the connecting rod, the connecting pipe can be communicated with the inside of the connecting rod and the locking assembly can be unlocked from locking the seal.

[0006] As a further solution of the present invention, the dynamic adjustment assembly includes a cross bar and a linear driving group. An inclined surface is formed on the cross bar, and the inclined direction of the inclined surface gradually rises from the side close to the indicating rod to the side far from the indicating rod. A bottom plate is slidably connected to the cross bar, the benchmark is slidably connected to the bottom plate, an adjusting rod is rotatably connected to the bottom plate, the bottom end of the adjusting rod contacts the inclined surface, a sliding groove is formed on the side wall of the benchmark, and the top end of the adjusting rod slides inside the sliding groove; the linear driving group is used to keep a fixed spacing between the bottom plate and the indicating rod every time the liquid cylinder and the connecting pipe move upward to the highest position.

[0007] As a further solution of the present invention, the linear driving group includes a driving rod rotatably connected to the side wall of the indicating rod. A second torsion spring is sleeved on the rotating shaft of the driving rod. A side plate is arranged on one side of the driving rod, and the side plate is fixedly connected to the bottom plate; When the indicating rod is at the uppermost position, the driving rod is blocked by the top end of the side plate and remains in a horizontal state. When the indicating rod descends from the uppermost position and disengages from the top end of the side plate, the second torsion spring will drive the driving rod to be in an inclined state.

[0008] As a further solution of the present invention, a contact rod is elastically slidably connected to the indicating rod.

[0009] As a further solution of the present invention, a second spring is fixedly connected between the benchmark and the bottom plate.

[0010] As a further solution of the present invention, the locking assembly includes a clamping rod, the clamping rod is elastically slidably connected to the liquid cylinder, a clamping groove is arranged inside the clamping rod, and a clamping part is elastically slidably connected to the rotating shaft of the seal; When the driving assembly drives the liquid cylinder to descend to the lowest position, the bottom end of the clamping rod is jacked up by the connecting rod and the clamping groove is disengaged from the clamping part.

[0011] As a further solution of the present invention, a top piece is elastically and slidably connected inside the connecting rod, and the top piece is located directly below the communicating pipe.

[0012] As a further solution of the present invention, the driving assembly includes a telescopic member fixedly connected between the connecting rod and the side wall of the liquid cylinder.

[0013] As a further solution of the present invention, an air hole is provided on one side of the liquid cylinder away from the seal, and filter cotton is arranged inside the air hole.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The spraying device mentioned in the present invention converts the flow rate change into an intuitive position change through the linkage of the pressing plate and the indicating rod, reduces the interference of the complex flow channel structure on the detection result, has stronger adaptability to the flow channel structure, compatibility with working conditions, and anti-interference ability, and avoids the direct negative requirements of contact measurement, meeting the requirements of the complex environment and rapid screening on the maintenance site of power plant boilers.

[0015] 2. When the pressure of the present invention linearly decreases, the cumulative flow rate integration can avoid the flow rate fluctuation at a single moment, such as the turbulence caused by the step structure. Even if there are steps or tapers inside the nozzle, resulting in local flow rate changes, the cumulative flow rate is still positively correlated with the overall cross-sectional area of the nozzle inner diameter, has stronger inclusiveness for irregular nozzle inner diameters, and the trend of linearly decreasing pressure can reduce the instantaneous fluctuation of the fluid, making the change trend of the cumulative flow rate more stable.

[0016] 3. Through the cooperation of the driving rod, inclined surface, and adjusting rod, the present invention enables the threshold value of the wear of the nozzle inner diameter caused by the thrust of the pressing plate to change dynamically when the pressure linearly decreases. Furthermore, when the inner diameter result of the nozzle does not exceed the threshold value during the first operation of the pressing plate, the threshold reference can be adjusted accordingly when the pressure of the pressing plate decreases. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the internal structure of the liquid cylinder and the communicating pipe of the present invention; Figure 3 is Figure 2 a partial enlarged view of A in Figure 4 is a schematic diagram of the internal structure of the clamping rod, liquid seal, and liquid cylinder of the present invention; Figure 5 is a schematic diagram of the positional relationship between the clamping groove, clamping member, and seal of the present invention; Figure 6 is a schematic diagram of the positional relationship between the communicating pipe and the connecting rod after the liquid cylinder descends in the present invention; Figure 7Schematic diagram of the positional relationship between the drive rod and the side plate before the liquid cylinder of the present invention descends; Figure 8 Schematic diagram of the positional relationship between the cross bar and the benchmark bar and between the contact rod and the adjusting rod of the present invention; Figure 9 Schematic diagram of the positional relationship between the cross bar and the adjusting rod and the negative film of the present invention; Figure 10 Schematic diagram of the positional relationship between the negative film and the adjusting rod and between the second spring and the third spring of the present invention; Figure 11 Schematic diagram when the pressing plate moves for the first time when the threshold value of the present invention is La; Figure 12 Schematic diagram when the pressing plate moves when the threshold value of the present invention is Lb; Figure 13 Schematic diagram of the positional states of the drive rod before and after the liquid cylinder of the present invention descends (wherein, (a) and (b) are respectively the schematic diagrams of the states of the drive rod before and after the liquid cylinder descends); Figure 14 Schematic diagram of the states of the drive rod before and during its upward movement (wherein, (a) and (b) are respectively the schematic diagrams of the drive rod before and during its upward movement).

[0018] In the drawings: 1. Spray rod; 2. Connecting rod; 3. Nozzle; 4. Liquid cylinder; 5. Connecting pipe; 6. Liquid outlet; 7. Sealing member; 8. First torsion spring; 9. Pressing plate; 10. Fixed rod; 11. First spring; 12. Indicator rod; 13. Benchmark bar; 14. Cross bar; 15. Inclined surface; 16. Negative film; 17. Adjusting rod; 18. Sliding groove; 19. Drive rod; 20. Second torsion spring; 21. Contact rod; 22. Second spring; 23. Clamping rod; 24. Clamping groove; 25. Clamping member; 26. Telescopic member; 27. Air hole; 28. Side plate; 29. Top piece; 30. Third spring; 31. Fourth spring; 32. Fifth spring; 33. Sixth spring. Detailed implementation manners

[0019] Please refer to Figures 1-14, the present invention provides a technical solution: a spraying device for a corrosion-resistant coating of a tube row used in the maintenance of a power plant boiler, including a spray rod 1, a connecting rod 2 fixedly connected to the spray rod 1, and a nozzle 3 threadedly connected to the connecting rod 2. It further includes a detection component, which includes a liquid cylinder 4, a connecting pipe 5, a seal 7, a locking component, a pressing plate 9, an indicating rod 12, a reference rod 13, a dynamic adjustment component, and a driving component. The liquid cylinder 4 is arranged above the connecting rod 2. The connecting pipe 5 is fixedly connected to the liquid cylinder 4 and has a liquid outlet 6 opened at a position near its bottom. The connecting pipe 5 is slidably connected to the connecting rod 2. The seal 7 is rotatably connected inside the liquid cylinder 4 and a first torsion spring 8 is sleeved on its rotating shaft. The locking component is used to lock the seal 7. The pressing plate 9 is slidably connected inside the liquid cylinder 4 through a fixing rod 10. A first spring 11 is fixedly connected between the pressing plate 9 and the inner wall of the liquid cylinder 4. The indicating rod 12 is fixedly connected to the bottom of the fixing rod 10. The reference rod 13 is arranged above the connecting rod 2 and there is a spacing between it and the indicating rod 12. The dynamic adjustment component is used to make the horizontal spacing between the reference rod 13 and the indicating rod 12 smaller when the first spring 11 is stretched. The driving component is used to control the sliding of the connecting pipe 5 inside the connecting rod 2. When the liquid outlet 6 descends into the connecting rod 2, it can make the connecting pipe 5 communicate with the inside of the connecting rod 2 and release the locking of the seal 7 by the locking component.

[0020] As a further solution of the present invention, the dynamic adjustment component includes a cross bar 14 and a linear drive group. An inclined surface 15 is opened on the cross bar 14. The inclined direction of the inclined surface 15 gradually rises from the side close to the indicating rod 12 to the side far from the indicating rod 12. A bottom plate 16 is slidably connected to the cross bar 14. The reference rod 13 is slidably connected to the bottom plate 16. An adjusting rod 17 is rotatably connected to the bottom plate 16. The bottom end of the adjusting rod 17 contacts the inclined surface 15. A sliding groove 18 is opened on the side wall of the reference rod 13. The top end of the adjusting rod 17 slides inside the sliding groove 18; the linear drive group is used to keep a fixed spacing between the bottom plate 16 and the indicating rod 12 every time the liquid cylinder 4 and the connecting pipe 5 move upward to the highest position.

[0021] As a further solution of the present invention, the linear drive group includes a drive rod 19 rotatably connected to the side wall of the indicating rod 12. A second torsion spring 20 is sleeved on the rotating shaft of the drive rod 19. A side plate 28 is arranged on one side of the drive rod 19. The side plate 28 is fixedly connected to the bottom plate 16; When the indicating rod 12 is at the uppermost position, the drive rod 19 is blocked by the top end of the side plate 28 and remains in a horizontal state. When the indicating rod 12 descends from the uppermost position and disengages from the top end of the side plate 28, the second torsion spring 20 will drive the drive rod 19 to be in an inclined state.

[0022] As a further solution of the present invention, a contact rod 21 is slidably connected to the indicating rod 12. A third spring 30 is fixedly connected between the contact rod 21 and the indicating rod 12.

[0023] AsFigures 1-7 and Figure 11 as shown in The process of detecting the inner diameter of the nozzle 3 after the spraying component composed of the spray bar 1, the connecting rod 2 and the nozzle 3 finishes spraying: Rotate the seal 7 one week in advance through the knob on the seal 7 to make the first torsion spring 8 in a compressed state. After rotating one week, lock the seal 7 through the locking component. At this time, the seal 7 is in a waiting-to-be-triggered state; Lower the liquid cylinder 4 and the connecting pipe 5 through the driving component. When the liquid cylinder 4 does not descend, the side wall of the connecting rod 2 seals the liquid outlet 6; when the liquid cylinder 4 descends to the limit position, the liquid outlet 6 descends into the inside of the connecting rod 2. At this time, the right side wall of the connecting pipe 5 seals the right side of the connecting rod 2. At this time, the locking component releases the locking of the seal 7 so that the seal 7 can rotate one week around the rotating shaft. Take the time for the seal 7 to rotate one week as the total duration of the inner diameter detection of the nozzle 3. When the seal 7 does not rotate, it isolates the water inside the connecting pipe 5 and the liquid cylinder 4. Due to the incompressible characteristic of water, the pressing plate 9 cannot move under the elastic relaxation of the first spring 11; During the rotation of the seal 7, the connecting pipe 5 is connected to the liquid cylinder 4. At this time, the elastic relaxation of the first spring 11 will gradually push the pressing plate 9 and the fixed rod 10 to slide leftward on the inner wall of the liquid cylinder 4. By squeezing the water, the water can flow out through the inner diameter of the nozzle 3 after passing through the connecting pipe 5 and the liquid outlet 6. Moreover, the thrust of the pressing plate 9 decreases gradually as the elastic relaxation of the first spring 11 increases, that is, the thrust size is proportional to the elastic relaxation. However, when the pressure decreases linearly, the cumulative flow rate passing through the nozzle 3 is still linearly positively correlated with the cross-sectional area (wear degree) of the nozzle 3. For example, when the wear degree of the nozzle 3 does not exceed the threshold value, during the process of the seal 7 rotating one week, the distance that the pressing plate 9 moves leftward is a fixed distance, that is, at this time, the flow rate of the water flowing through the nozzle 3 inside the liquid cylinder 4 is a fixed flow rate. And the judgment standard of this threshold value is: whether the indicating rod 12 contacts the reference rod 13 after isolating the connecting pipe 5 and the inner wall of the liquid cylinder 4 after the seal 7 rotates one week; If the indicating rod 12 does not contact the reference rod 13, it means that the water flow rate discharged inside the liquid cylinder 4 during the total rotation time of the seal 7 does not exceed the threshold value, that is, at this time, the inner diameter wear of the nozzle 3 is still within the controllable range; If the indicating rod 12 contacts the reference rod 13, it means that the water flow rate discharged inside the liquid cylinder 4 during the total rotation time of the seal 7 exceeds the threshold value, that is, at this time, the wear degree of the inner diameter of the nozzle 3 exceeds the threshold value; After the detection is completed, reset the liquid cylinder 4 and the connecting pipe 5 through the driving component.

[0024] Before that, conduct a reference flow rate test on the new nozzle 3 in advance, record the flow rate data that can pass through at different wear stages, such as when artificially worn to 0.2 mm, 0.5 mm, 0.8 mm, etc. as reference parameters, and set a flow rate threshold; Therefore, when the inner diameter of the nozzle 3 increases (e.g., worn from 5 mm to 5.5 mm), the cross-sectional area increases, and the cumulative flow rate is still linearly and positively correlated with the cross-sectional area of the nozzle 3 (degree of wear). Therefore, by measuring the total flow rate within a fixed time, it can be compared with the reference flow rate of the new nozzle 3 to determine whether the wear exceeds the threshold (e.g., a 10% increase in flow rate corresponds to 0.5 mm of inner diameter wear). Moreover, when the pressure linearly decreases, the cumulative flow rate flowing through the nozzle 3 can avoid the flow rate fluctuations at a single moment (such as the turbulence caused by the stepped structure). Even if there are steps or tapers inside the nozzle 3 resulting in local flow velocity changes, the cumulative flow rate is still positively correlated with the overall cross-sectional area of the inner diameter of the nozzle 3 (because the pressure decreasing trend is fixed and the flow rate change trend is only determined by the inner diameter), which has stronger inclusiveness for the irregular inner diameter of the nozzle 3, and the linearly decreasing trend of the pressure can reduce the instantaneous fluctuations of the fluid, making the change trend of the cumulative flow rate more stable; In the present invention, through the linkage of the pressing plate 9 and the indicating rod 12, the flow rate change is converted into an intuitive position change, and it can reduce the interference of the complex flow channel structure on the detection result. It is superior to the flow sensor in terms of flow channel structure adaptability, working condition compatibility (high temperature, high pressure, gas-solid two-phase), anti-interference ability (no need for strictly constant pressure, only requires the pressure to decrease linearly, and can reduce the dependence on the stability of the pressure source), etc., and avoids the negative requirements directly generated by contact measurement, meeting the requirements of the complex environment and rapid screening at the power plant boiler maintenance site; This flow rate method can be used as a rapid screening means to preliminarily screen the nozzles 3 with abnormal flow rates to avoid subsequent overly uneven spraying, mark the nozzles 3 with abnormal flow rates, and then use precision means such as internal diameter micrometers and optical measurements for rechecking, reducing the ineffective detection after disassembly. First, screen out the nozzles 3 with flow rates exceeding the reference threshold through flow rate detection, and then specifically disassemble and measure the inner diameter to improve the maintenance efficiency and meet the requirements of rapid screening.

[0025] Working process of the dynamic adjustment component: Since the thrust of the pressing plate 9 decreases linearly, during multiple uses of the pressing plate 9, the end point where the pressing plate 9 stops after each single use is not the same; Take Figure 11 as an example. If the initial distance between the pressing plate 9 and the inner wall of the liquid cylinder 4 is c during the first use, and the distance between the indicating rod 12 and the contact rod 21 is La (threshold), and the distance between the negative film 16 and the indicating rod 12 is L. When the seal 7 rotates one week, if the indicating rod 12 contacts the contact rod 21 (i.e., the distances moved by both the pressing plate 9 and the indicating rod 12 are La), it indicates that the flow rate flowing through the nozzle 3 exceeds the threshold. At this time, the distance that the pressing plate 9 moves to the left will increase. If it exceeds the threshold too much, the indicating rod 12 will squeeze the contact rod 21, and the third spring 30 will be stretched for buffering when the contact rod 21 slides along the reference rod 13; Take Figure 12For example, if the final position of the pressing plate 9 after the first work is completed is d (d>c), because the thrust of the pressing plate 9 decreases linearly, the moving distance of the pressing plate 9 is shortened in the same time. At this time, the threshold needs to be linearly reduced, and the reduced threshold is Lb (Lb<La); The threshold adjustment methods are as follows: Because the fluid cylinder 4 and the connecting pipe 5 will be driven downward by the driving assembly before the pressing plate 9 works for the first time, and the driving assembly will drive the fluid cylinder 4 and the connecting pipe 5 to reset upward after the pressing plate 9 works for the first time, and the pressing plate 9 will move to the left inside the fluid cylinder 4 after the pressing plate 9 works for the first time, so before the fluid cylinder 4 descends, the driving rod 19 is in a Figure 13 In the horizontal state shown in Figure (a), the second torsion spring 20 is in a compressed state. When the drive assembly drives the fluid cylinder 4 to descend, the drive rod 19 is separated from the top of the side plate 28, and the second torsion spring 20 drives the drive rod 19 to rotate to the horizontal state shown in Figure (a). Figure 13 In the tilted state shown in Figure (b), the pressure plate 9 and the indicator rod 12 move leftward by a distance La (threshold) after detection. During the movement, the driving rod 19 is blocked by the side plate 28 and changes to Figure 14 As shown in the middle (a) figure (the thrust of the driving rod 19 on the side plate 28 is much smaller than the static friction of the bottom plate 16 sliding along the cross bar 14), the driving rod 19 is in contact with the side plate 28. When the detection is completed, if the wear of the inner diameter of the nozzle 3 is less than the threshold value, the indicator rod 12 does not contact the contact rod 21. If the wear degree exceeds the threshold value or is equal to the threshold value, the contact rod 21 will be pushed or fit with the contact rod 21. After the detection is completed, the driving assembly drives the fluid cylinder 4 to reset upwards. During the upward movement, the driving rod 19 keeps in contact with the side plate 28 and moves upwards. Figure 14 As shown in Figure (b), the driving rod 19 continues to rise, which will force the side plate 28 and the film 16 to move synchronously to the left through contact with the side plate 28. When the liquid cylinder 4 is reset upward to the maximum extent, the side plate 28 and the film 16 can be pushed to the position as shown in Figure 2. Figure 13 As shown in Figure (b), at this time, the bottom plate 16 and the side plate 28 will move to the left synchronously; Since the inclination direction of the inclined surface 15 gradually increases from the side close to the indicator rod 12 to the side away from the indicator rod 12, the bottom end of the adjusting rod 17 will be resisted by the inclined surface 15 during the sliding of the negative film 16 to the left along the cross bar 14, so that the adjusting rod 17 gradually rotates to the right around the rotation axis, and the longer the distance the adjusting rod 17 moves to the left, the greater the angle of the adjusting rod 17 rotating to the right. When the adjusting rod 17 rotates to the right, it will slide along the inside of the slide groove 18 and push the mark rod 13 to move along the negative film 16 to the indicator rod 12, so that the distance between the indicator rod 12 and the contact rod 21 becomes smaller when the distance L between the negative film 16 and the indicator rod 12 remains unchanged, so that the contact rod 21 gradually moves to the right when the pressure of the pressure plate 9 decreases linearly, so that the threshold value decreases linearly. In the present invention, through the cooperation of the driving rod 19, the inclined surface 15, and the adjusting rod 17, the threshold value of the inner diameter wear of the nozzle 3 can be dynamically changed when the thrust of the pressing plate 9 decreases linearly. Furthermore, when the pressing plate 9 works for the first time, if the inner diameter result of the nozzle 3 does not exceed the threshold value, the threshold reference can be adjusted accordingly as the pressure of the pressing plate 9 decreases when the pressing plate 9 continues to work subsequently.

[0026] A second spring 22 is fixedly connected between the benchmark 13 and the negative film 16.

[0027] As Figure 10 shown: Through the arranged second spring 22, the spring constant of the second spring 22 is greater than that of the third spring 30. When the side plate 28 and the negative film 16 move leftward, the benchmark 13 is pushed to drive the contact rod 21 to move rightward through the contact between the adjusting rod 17 and the inclined surface 15. At this time, the second spring 22 will be stretched, but the reset tendency of the second spring 22 will be blocked by the inclined surface 15 against the adjusting rod 17, so that the benchmark 13 cannot slide on the negative film 16. After the overall detection work is completed, the pressing plate 9 is moved rightward to reset by injecting water into the liquid cylinder 4, and then the negative film 16 is manually pushed rightward. At this time, the adjusting rod 17 can be gradually moved by the pulling of the second spring 22 on the benchmark 13 until it moves to the rightmost side and is in the initial state.

[0028] The locking assembly includes a clamping rod 23, the clamping rod 23 is slidably connected to the liquid cylinder 4, a fourth spring 31 is fixedly connected between the inner wall of the liquid cylinder 4 and the clamping rod 23, a clamping groove 24 is arranged inside the clamping rod 23, a clamping member 25 is slidably connected to the rotating shaft of the seal 7, and a fifth spring 32 is fixedly connected between the inner wall of the seal 7 and the clamping member 25; When the driving assembly drives the liquid cylinder 4 to descend to the lowest position, the bottom end of the clamping rod 23 is lifted by the connecting rod 2, and the clamping groove 24 is disengaged from the clamping member 25.

[0029] As Figures 3-5 shown: Initially, that is, before the liquid cylinder 4 descends, the clamping rod 23 is manually pulled upward to disengage the clamping groove 24 from the clamping member 25, and then the seal 7 is manually rotated for one week and the clamping rod 23 is released. At this time, the fourth spring 31 will drive the clamping rod 23 to reset, and the clamping groove 24 locks the clamping member 25. When detecting, after the driving assembly drives the liquid cylinder 4 to descend to the limit position, the clamping rod 23 will contact the top end of the connecting rod 2, thereby lifting the clamping rod 23 and stretching the fourth spring 31. At this time, the clamping groove 24 is disengaged from the clamping member 25, so that the seal 7 rotates.

[0030] A top piece 29 is slidably connected inside the connecting rod 2. A sixth spring 33 is fixedly connected between the top piece 29 and the inner wall of the connecting rod 2. The top piece 29 is located directly below the communicating pipe 5.

[0031] As Figure 6 shown: After the liquid cylinder 4 and the communicating pipe 5 descend to the limit position, the bottom end of the communicating pipe 5 will press down the top piece 29, causing the sixth spring 33 to be compressed. The top piece 29 remains in contact with the bottom end of the communicating pipe 5 and slides downward inside the connecting rod 2, thereby improving the sealing performance.

[0032] The driving assembly includes a telescopic member 26 fixedly connected between the side walls of the connecting rod 2 and the liquid cylinder 4.

[0033] As Figure 1 shown: The telescopic member 26 is one of a cylinder, an electric cylinder, or an electric push rod that can be wirelessly controlled in the prior art, and the liquid cylinder 4 is lifted and lowered by its telescoping.

[0034] An air hole 27 is formed on the side of the liquid cylinder 4 away from the seal 7, and a filter cotton is arranged inside the air hole 27.

[0035] As Figure 4 shown: The air hole 27 connects the right side of the pressing plate 9 to the outside, facilitating the sliding of the pressing plate 9. The arrangement of the filter cotton (the filter cotton can be a sponge layer, which is common knowledge in the prior art and will not be specifically described here) can prevent foreign impurities from entering.

Claims

1. A spraying device for a corrosion-resistant coating of a tube bank used for power plant boiler maintenance, comprising a spray rod (1), a connecting rod (2) fixedly connected to the spray rod (1), and a nozzle (3) threadedly connected to the connecting rod (2), characterized in that, It further includes a detection component, and the detection component includes: A liquid cylinder (4), which is arranged above the connecting rod (2); A connecting pipe (5), which is fixedly connected to the liquid cylinder (4) and has a liquid outlet (6) opened at a position near the bottom. The connecting pipe (5) is slidably connected to the connecting rod (2); A seal (7), which is rotatably connected inside the liquid cylinder (4) and has a first torsion spring (8) sleeved on its rotating shaft; A locking component, which is used to lock the seal (7); A pressing plate (9), which is slidably connected inside the liquid cylinder (4) through a fixing rod (10). A first spring (11) is fixedly connected between the pressing plate (9) and the inner wall of the liquid cylinder (4); An indicating rod (12), which is fixedly connected to the bottom of the fixing rod (10); A reference rod (13), which is arranged above the connecting rod (2) and has a spacing from the indicating rod (12); A dynamic adjustment component, which is used to make the lateral spacing between the reference rod (13) and the indicating rod (12) smaller when the first spring (11) is stretched; A driving component, which is used to control the sliding of the connecting pipe (5) inside the connecting rod (2). When the liquid outlet (6) descends into the connecting rod (2), it can make the connecting pipe (5) communicate with the inside of the connecting rod (2) and release the locking of the seal (7) by the locking group.

2. The spraying device for the corrosion-resistant coating of the tube bank used for the maintenance of the power plant boiler according to claim 1, wherein: The dynamic adjustment component includes a cross bar (14) and a linear driving group. An inclined surface (15) is opened on the cross bar (14). The inclined direction of the inclined surface (15) rises from the side close to the indicating rod (12) to the side far from the indicating rod (12). A bottom plate (16) is slidably connected to the cross bar (14). The reference rod (13) is slidably connected to the bottom plate (16). An adjusting rod (17) is rotatably connected to the bottom plate (16). The bottom end of the adjusting rod (17) contacts the inclined surface (15). A sliding groove (18) is opened on the side wall of the reference rod (13). The top end of the adjusting rod (17) slides inside the sliding groove (18). The linear driving group is used to keep a fixed spacing between the bottom plate (16) and the indicating rod (12) every time the liquid cylinder (4) and the connecting pipe (5) move upward to the highest position.

3. The spraying device for the corrosion-resistant coating of the tube row used for power plant boiler maintenance according to claim 2, characterized in that: The linear driving group includes a driving rod (19) rotatably connected to the side wall of the indicating rod (12). A second torsion spring (20) is sleeved on the rotating shaft of the driving rod (19). A side plate (28) is arranged on one side of the driving rod (19). The side plate (28) is fixedly connected to the bottom plate (16); When the indicating rod (12) is at the uppermost position, the driving rod (19) is blocked by the top end of the side plate (28) and remains in a horizontal state; When the indicating rod (12) descends from the uppermost position and disengages from the top end of the side plate (28), the second torsion spring (20) will drive the driving rod (19) to be in an inclined state.

4. The spraying device for the corrosion-resistant coating of the tube row used for the maintenance of the power plant boiler according to claim 2, characterized in that: A contact rod (21) is elastically slidably connected to the indicating rod (12).

5. The spraying device for the corrosion-resistant coating of the tube bank used for the maintenance of the power plant boiler according to claim 3, characterized in that: A second spring (22) is fixedly connected between the reference rod (13) and the bottom plate (16).

6. The spraying device for the corrosion-resistant coating of the tube bank used for power plant boiler maintenance according to claim 1, wherein: The locking component includes a clamping rod (23), the clamping rod (23) is elastically slidably connected to the liquid cylinder (4), a clamping groove (24) is arranged inside the clamping rod (23), and a clamping member (25) is elastically slidably connected to the rotating shaft of the seal (7); After the driving component drives the liquid cylinder (4) to descend to the lowest position, the bottom end of the clamping rod (23) is jacked up by the connecting rod (2) and the clamping groove (24) is disengaged from the clamping member (25).

7. The spraying device for the corrosion-resistant coating of the tube bank used for power plant boiler maintenance according to claim 1, characterized in that: A top piece (29) is elastically slidably connected inside the connecting rod (2), and the top piece (29) is located directly below the communicating pipe (5).

8. The spraying device for the corrosion-resistant coating of the tube bank used for power plant boiler maintenance according to claim 1, wherein: The driving component includes a telescopic member (26) fixedly connected between the connecting rod (2) and the side wall of the liquid cylinder (4).

9. The spraying device for the corrosion-resistant coating of the tube row used for power plant boiler maintenance according to claim 1, wherein: An air hole (27) is formed in one side of the liquid cylinder (4) away from the seal (7), and filter cotton is arranged inside the air hole (27).

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