Device for spraying coating on flue superheater of coal-fired boiler in power plant

Abstract

The utility model discloses a power plant coal-fired boiler flue superheater paint spraying device which comprises a spraying gun head body, mounting holes, perforated bolts and a supporting assembly, the spraying gun head body is provided with a plurality of mounting holes, the perforated bolts are mounted in the mounting holes, and the supporting assembly is arranged on the surface of the spraying gun head body. A gun rack connecting hole is formed in the tail of the spraying gun head body, and threads are arranged in the gun rack connecting hole. According to the spraying gun head, compressed gas carries paint to enter the spraying gun head main body, the paint is sprayed out at a high speed from the small through holes of the six perforated bolts, and the sprayed paint can be atomized under the action of high-pressure gas, so that 360-degree dead-angle-free all-dimensional spraying is realized, and the purpose of full-coverage spraying of the pipe wall of the superheater is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of superheater tube wall spraying, in particular to a device for spraying paint on a flue superheater of a coal-fired boiler in a power plant. Background Art

[0002] After the flue superheater of a coal-fired boiler in a power plant has been running for a certain period of time, the original coating will be damaged or fall off due to the multiple effects of high-temperature oxidation, corrosion and flue gas erosion and wear. The superheater must be refurbished and protected regularly. Among them, spraying a protective layer of paint on the tube wall of the superheater heating surface is a commonly used method.

[0003] Since the superheaters at the tail end of pulverized coal boilers are mostly serpentine tubes, with many layers of tube rows and densely arranged pipes, the gaps between the pipes are small, usually not exceeding 50mm, or even smaller, and the furnace tubes are deep. Moreover, when spraying the coating on the superheater, it is usually sprayed online. When the existing commonly used high-pressure spraying equipment is used for spraying, the spray gun head adopts a linear spraying method, which can often only spray the front wall of the tube row and partial parts of the side wall, while the back wall of the tube row is basically difficult to spray, so that it is impossible to perform all-round and full coverage spraying operations on the deep tube rows of the superheater. This form of spray gun head has poor construction flexibility and low construction efficiency, and the tube wall coating cannot achieve full coverage, the coating thickness is uneven, and the spraying quality effect is poor; and the existing nozzle is connected to the external gun frame. When the nozzle enters the inside of the pipeline, it will produce obvious shaking when the spray gun head is working, which will then drive the spray gun head to shake, thereby affecting the spraying effect. Summary of the invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a device for spraying paint on the flue superheater of a coal-fired boiler in a power plant, which solves the problem that the existing spray gun head cannot spray 360° without dead angles and produces shaking during the spraying process.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for spraying paint on a flue superheater of a coal-fired boiler in a power plant, comprising a spray gun head body, mounting holes, hole-opening bolts and a support assembly, wherein a plurality of mounting holes are opened on the spray gun head body, hole-opening bolts are installed in the mounting holes, a support assembly is provided on the surface of the spray gun head body, a gun rack connecting hole is opened at the rear of the spray gun head body, and a thread is provided in the gun rack connecting hole.

[0006] Preferably, a small through hole is also provided on the hole-opening bolt.

[0007] Preferably, there are six mounting holes, which are evenly divided into two groups and arranged on the surface of the spray gun head body, arranged in a staggered manner, and the hole-opening bolts are installed according to the settings of the mounting holes.

[0008] Preferably, the support assembly includes a hinged plate, a rocker arm, a roller, a push rod, a slider and a limit plate; the hinged plate is arranged on the surface of the spray gun head body, the hinged plate is hingedly connected to the rocker arm, the other end of the rocker arm away from the hinged plate is connected to the roller, the bottom middle part of the rocker arm is hingedly connected to the push rod, the other end of the push rod is hingedly connected to the slider, and a limit plate is provided on the periphery of the slider.

[0009] Preferably, the slider further comprises a spring telescopic rod, both ends of the bottom of the slider are provided with a spring telescopic rod, and the rod head of the spring telescopic rod is in an arc shape.

[0010] Preferably, a total of four rollers are provided on the spray gun head body.

[0011] Preferably, the limit plate also includes a card hole and a slide groove; a slide groove is opened on the inner side of the limit plate, and the slider is embedded in the slide groove and slides, and a plurality of card holes are also opened on the bottom wall of the slide groove of the limit plate, and the card holes are used to cooperate with the spring telescopic rod to fix the slider.

[0012] Preferably, the spray gun head body also includes an inspection bolt, and an inspection bolt is provided at the other end of the spray gun head body away from the gun frame connecting hole.

[0013] Compared with the existing technology, the utility model has the following beneficial effects: the utility model carries the paint into the main body of the spray gun head through compressed gas, and sprays it out at high speed from the small through holes of the six open bolts. The sprayed paint will be atomized under the action of the high-pressure gas, thereby realizing 360° all-round spraying without dead angles, and achieving the purpose of full coverage of the superheater tube wall; the four rollers on the outer circumference of the spray gun head main body are in contact with the inner wall of the flue, thereby improving the stability of the spray gun head main body during operation and preventing the spray gun head main body from shaking during the spraying process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main planar structure of the practical spray gun head.

[0015] Figure 2 This is a schematic diagram of the planar structure of the connection between the spray gun head body and the support assembly of this utility model.

[0016] Figure 3 This is a top view of the practical limiting plate.

[0017] Markings in the figure: 1. Spray gun head body, 2. Mounting hole, 3. Opening bolt, 4. Inspection bolt, 51. Hinge plate, 52. Rocker, 53. Roller, 54. Push rod, 55. Slider, 5501. Spring telescopic rod, 56. Limit plate, 5601. Clamp hole, 5602. Slide groove, 6. Gun frame connecting hole. DETAILED DESCRIPTION

[0018] like Figure 1-Figure 3As shown in the figure; the utility model provides a technical solution: a device for spraying paint on a flue superheater of a coal-fired boiler in a power plant, comprising a spray gun head body 1, a mounting hole 2, a hole-opening bolt 3 and a support assembly, wherein the spray gun head body 1 is provided with a plurality of mounting holes 2, and the hole-opening bolt 3 is installed in the mounting hole 2, and a support assembly is provided on the surface of the spray gun head body 1, and a gun rack connecting hole 6 is provided at the tail of the spray gun head body 1, and a thread is provided in the gun rack connecting hole 6, and the gun rack connecting hole 6 is used to be connected to the spray pipe of the external gun rack;

[0019] Before starting work, first connect the gun frame connection hole 6 with the spray pipe of the external gun frame, remove the inspection bolt 4 and the opening bolt 3, and input compressed gas through the spray pipe of the external gun frame to clean the inside of the spray gun head body 1; then install the inspection bolt 4 and the opening bolt 3 and tighten them, and then pass compressed gas to treat the through hole of the opening bolt 3 to make the hole unobstructed and unblocked;

[0020] After working, the paint is carried into the spray gun head body 1 by compressed gas. Since there is sufficient air pressure in the spray gun head body 1, the paint is sprayed out from the small through holes of the six open bolts 3 at high speed along with the high-pressure gas. The sprayed paint will be atomized under the action of the high-pressure gas, thereby realizing 360° all-round spraying without dead angles, and achieving the purpose of full coverage of the superheater tube wall.

[0021] Furthermore, a small through hole is also formed on the hole-opening bolt 3 .

[0022] Furthermore, there are six mounting holes 2 , which are evenly divided into two groups and arranged on the surface of the spray gun head body 1 , and are staggered. The hole-opening bolts 3 are installed according to the settings of the mounting holes 2 , and one hole-opening bolt 3 is installed in each mounting hole 2 .

[0023] Furthermore, the support assembly includes a hinge plate 51, a rocker arm 52, a roller 53, a push rod 54, a slider 55 and a limit plate 56; the hinge plate 51 is arranged on the surface of the spray gun head body 1, the hinge plate 51 is hingedly connected with the rocker arm 52, the other end of the rocker arm 52 away from the hinge plate 51 is connected with the roller 53, the bottom middle part of the rocker arm 52 is hingedly connected with the push rod 54, the other end of the push rod 54 is hingedly connected with the slider 55, and a limit plate 56 is arranged on the periphery of the slider 55; after the gun frame connecting hole 6 is connected to the spray pipe of the external gun frame, the slider 55 is pushed so that the slider 55 slides from left to right along the slide groove 5602 of the limit plate 56. When the slider 55 moves, it also drives the push rod 54 and the spring telescopic rod 5501 to move together. When the push rod 54 moves, it also pushes the swing rod 52 and the roller 53 to rotate upward and contact the inner wall of the superheater tube wall. The spring telescopic rod 5501 of the slider 55 cooperates with the clamping hole 5601 of the limit plate 56 to fix the adjusted roller 53. The four rollers 53 on the outer circumference of the spray gun head body 1 contact the inner wall of the superheater tube, thereby improving the stability of the spray gun head body 1 during operation and preventing the spray gun head body 1 from shaking during the spraying process. In addition, the roller 53 also facilitates the movement of the spray gun head body 1 in the flue.

[0024] Furthermore, the slider 55 further includes a spring telescopic rod 5501 . Both ends of the bottom of the slider 55 are provided with a spring telescopic rod 5501 , and the rod head of the spring telescopic rod 5501 is in an arc shape.

[0025] Furthermore, a total of four rollers 53 are disposed on the spray gun head body 1 .

[0026] Furthermore, the limiting plate 56 also includes a locking hole 5601 and a sliding groove 5602; a sliding groove 5602 is opened on the inner side of the limiting plate 56, and the slider 55 is embedded in the sliding groove 5602 to slide, and a plurality of locking holes 5601 are also opened on the bottom wall of the sliding groove 5602 of the limiting plate 56, and the locking holes 5601 are used to cooperate with the spring telescopic rod 5501 to fix the slider 55.

[0027] Furthermore, the spray gun head body 1 also includes an inspection bolt 4, and an inspection bolt 4 is provided at the other end of the spray gun head body 1 away from the gun frame connecting hole 6; after spraying, the inspection bolt 4 is rotated and unscrewed from the spray gun head body 1 to facilitate cleaning of residual paint inside the spray head, and clean water can be sprayed out along the bolt hole under pressure to achieve the effect of efficient cleaning of the spray gun head body 1. At the same time, unscrewing the inspection bolt 4 is also convenient for checking the internal wear or rust of the spray gun head body 1.

[0028] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention; the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for spraying paint on a flue superheater of a coal-fired boiler in a power plant, comprising a spray gun head body (1), a mounting hole (2), a hole-opening bolt (3) and a support assembly, characterized in that: The spray gun head body (1) is provided with a plurality of mounting holes (2), and hole bolts (3) are installed in the mounting holes (2). A support assembly is provided on the surface of the spray gun head body (1), and a gun frame connecting hole (6) is provided at the rear of the spray gun head body (1), and a thread is provided in the gun frame connecting hole (6).

2. The device for spraying coating on the flue superheater of a coal-fired boiler in a power plant according to claim 1, characterized in that: The hole-opening bolt (3) is also provided with a small through hole.

3. The device for spraying coating on the flue superheater of a coal-fired boiler in a power plant according to claim 2, characterized in that: There are six mounting holes (2) in total, which are evenly divided into two groups and arranged on the surface of the spray gun head body (1), and are arranged in a staggered manner. The hole-opening bolts (3) are installed according to the arrangement of the mounting holes (2).

4. The device for spraying coating on the flue superheater of a coal-fired boiler in a power plant according to claim 3, characterized in that: The support assembly comprises a hinged plate (51), a swing rod (52), a roller (53), a push rod (54), a slider (55) and a limit plate (56); the hinged plate (51) is arranged on the surface of the spray gun head body (1); the hinged plate (51) is hingedly connected with the swing rod (52); the other end of the swing rod (52) away from the hinged plate (51) is connected with the roller (53); the middle part of the bottom of the swing rod (52) is hingedly connected with the push rod (54); the other end of the push rod (54) is hingedly connected with the slider (55); and the limit plate (56) is arranged on the periphery of the slider (55).

5. The device for spraying coating on the flue superheater of a coal-fired boiler in a power plant according to claim 4, characterized in that: The slider (55) further comprises a spring telescopic rod (5501). Both ends of the bottom of the slider (55) are provided with a spring telescopic rod (5501), and the rod head of the spring telescopic rod (5501) is in an arc shape.

6. The device for spraying coating on the flue superheater of a coal-fired boiler in a power plant according to claim 5, characterized in that: A total of four rollers (53) are provided on the spray gun head body (1).

7. The device for spraying coating on the flue superheater of a coal-fired boiler in a power plant according to claim 6, characterized in that: The limiting plate (56) further comprises a clamping hole (5601) and a sliding groove (5602); a sliding groove (5602) is provided on the inner side of the limiting plate (56), and the slider (55) is embedded in the sliding groove (5602) and slides; a plurality of clamping holes (5601) are further provided on the bottom wall of the sliding groove (5602) of the limiting plate (56); the clamping holes (5601) are used to cooperate with the spring telescopic rod (5501) to fix the slider (55).

8. The device for spraying coating on the flue superheater of a coal-fired boiler in a power plant according to claim 7, characterized in that: The spray gun head body (1) further comprises an inspection bolt (4), and an inspection bolt (4) is provided at the other end of the spray gun head body (1) away from the gun frame connection hole (6).

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