Boiler long retractable soot blower

Abstract

The present application provides a long telescopic soot blower for boilers, belonging to the field of boiler soot blowers. The long telescopic soot blower for boilers includes a main body, a track frame, a limit frame, a limit snap ring and a clamping component. The limit snap ring moves along the track frame through a moving wheel. The clamping component is arranged at the front end of the barrel and is adapted to be inserted into the limit snap ring when the barrel extends into the furnace. When the barrel of the main body extends into the furnace, the clamping component at the front end of the barrel can be inserted into the limit snap ring, and the limit snap ring can limit the swing of the front end of the barrel through the clamping component, thereby avoiding collision. The front end of the clamping component adopts a conical split structure. Even if the barrel has a slight swing when extending, the split structure can still be accurately inserted into the limit snap ring. After high-pressure gas is introduced into the barrel, the high-pressure gas pushes the piston to open the split structure to form a mandrel adapted to the limit snap ring, and the mandrel is more matched with the limit snap ring, making the clamping component rotate more smoothly and stably in the limit snap ring, further ensuring the stability of the front end of the barrel.

Description

Technical Field

[0001] This application belongs to the technical field of boiler soot blowers, and more specifically, relates to a long retractable boiler soot blower. Background Art

[0002] During the long-term operation of a boiler, ash accumulation and coking will occur on the heating surface, deteriorating heat transfer. Therefore, after the boiler has been operating for a period of time, it is necessary to perform soot blowing on the heating surface to clean the heating surface.

[0003] The long retractable soot blower is the most commonly used soot blowing equipment in coal-fired power plant boilers. It mainly consists of a frame, a telescopic barrel, a carriage, a rack track, a wall box, etc. During operation, the carriage drives the barrel to rotate and extend into the boiler. The nozzle at the front end of the barrel continuously sprays high-pressure gas to blow soot on the boiler heating surface. After the soot blowing is completed, the carriage withdraws the barrel outside the furnace.

[0004] Since the space inside the boiler is extremely large, the barrel needs to extend a long way to reach the middle position of the boiler. Coupled with the extremely large reaction force of the high-pressure gas on the front end of the barrel, the front end of the barrel will swing significantly during the soot blowing process, easily colliding with the components inside the boiler and causing accidents. Summary of the Invention

[0005] In view of this, the embodiments of this application provide a long retractable boiler soot blower to solve the technical problem of barrel swing in the existing long retractable soot blower.

[0006] To achieve the above object, the technical solution adopted in this application is:

[0007] Provide a long retractable boiler soot blower, including:

[0008] A main body having a barrel that can extend into the furnace;

[0009] A track frame horizontally arranged inside the furnace;

[0010] A limit frame parallel to and above the track frame;

[0011] A limit snap ring located below the track frame and opposite to the barrel. The limit snap ring moves along the track frame through a moving wheel. The moving wheel is located between the track frame and the limit frame, and the side edges are clamped on both sides of the track frame and the limit frame to maintain the stability of both sides of the limit snap ring;

[0012] The clamping component is arranged at the front end of the barrel and is adapted to be inserted into the limit snap ring when the barrel extends into the furnace chamber; the front end of the clamping component is a conical split structure, and a conical expansion block is arranged in the middle of the split structure; a piston chamber communicating with the inner cavity of the barrel is arranged at the rear end of the clamping component, and a piston is arranged in the piston chamber; when the gas in the barrel enters the piston chamber to push the piston, the piston pushes the expansion block forward to make the split structure open to form a mandrel adapted to the limit snap ring.

[0013] In some embodiments, the piston is provided with an axially penetrating leakage channel, and an air jet hole facing the gap of the mandrel is arranged at the front end of the piston chamber;

[0014] An annular gasket is arranged on the front end face of the piston chamber, and when the piston reaches the limit position forward, it is squeezed and sealed with the gasket, and at this time the gasket blocks the leakage channel.

[0015] In some embodiments, an avoidance groove for avoiding the air jet hole is arranged on the expansion block.

[0016] In some embodiments, the radial width of the air jet hole gradually becomes larger from the rear to the front.

[0017] In some embodiments, the clamping component includes a base, the piston chamber is arranged at the rear end of the base, and the rear end of the piston chamber is open; a through mounting hole is arranged at the front end of the barrel, and the rear end of the base is threadedly connected to the mounting hole to make the rear end of the piston chamber communicate with the inner cavity of the barrel;

[0018] The front end of the base is conical, and an activity space is formed inside, and a plurality of receiving grooves are distributed on the outer periphery, and each of the receiving grooves communicates with the activity space;

[0019] The expansion block is located in the activity space, a connecting rod is arranged at the front end of the piston, and the connecting rod extends from the piston chamber into the activity space and is connected to the expansion block; each lobe of the split structure is respectively hinged to the base and respectively retracted into each of the receiving grooves, and the back surface of each lobe abuts against the conical surface of the expansion block.

[0020] In some embodiments, convex blocks are respectively arranged on the outer sides of the front ends of the lobes of the split structure, and when the split structure opens to form a mandrel adapted to the limit snap ring, each of the convex blocks is limited to the front side of the limit snap ring.

[0021] In some embodiments, a closing spring and a closing sleeve are sleeved on the outer periphery of the base, and the closing spring pushes the closing sleeve forward to close the split structure;

[0022] A retaining ring is further provided on the outer periphery of the retractable sleeve. The outer diameter of the retaining ring is greater than the inner diameter of the limit snap ring so that after the clamping assembly is inserted into the limit snap ring, when the barrel continues to extend forward, the limit snap ring pushes the retractable sleeve backward and compresses the retractable spring, enabling the split structure to open.

[0023] In some embodiments, the end of the track frame close to the inner wall of the furnace slopes downward, so that the limit snap ring has a downward sliding tendency close to the inner wall of the furnace, and when the barrel extends forward, this downward sliding tendency enables the limit snap ring to form a force sufficient to push the retractable sleeve backward and compress the retractable spring.

[0024] The beneficial effects of the long telescopic soot blower for boilers provided by the embodiments of the present application are as follows: Compared with the prior art, the long telescopic soot blower for boilers in the embodiments of the present application can provide a limit snap ring that can move stably by arranging a track frame and a limit frame in the furnace; when the barrel of the main body extends into the furnace, the clamping assembly at the front end of the barrel can be inserted into the limit snap ring, and the limit snap ring can limit the swaying of the front end of the barrel through the clamping assembly, thus avoiding collisions.

[0025] The front end of the clamping assembly adopts a tapered split structure. Even if there is a slight sway when the barrel extends in, the split structure can still be accurately inserted into the limit snap ring. When high-pressure gas is introduced into the barrel, the high-pressure gas pushes the piston to open the split structure to form a mandrel adapted to the limit snap ring, and the mandrel matches the limit snap ring better, so as to ensure that the clamping assembly rotates more smoothly and stably in the limit snap ring, thereby further ensuring the stability of the front end of the barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a schematic diagram of the use state of the long telescopic soot blower for boilers provided by the embodiments of the present application;

[0028] Figure 2 is Figure 1 a cross-sectional view of the clamping assembly and the limit snap ring of the long telescopic soot blower for boilers in, where the clamping assembly is in a retracted state;

[0029] Figure 3 is Figure 2 a state diagram of the clamping assembly of the long telescopic soot blower for boilers in after it is opened;

[0030] Figure 4 is Figure 3 the front view of the clamping component in

[0031] Figure 5 is Figure 3 the rear view of the piston in

[0032] Among them, each reference numeral in the figure:

[0033] 1 - barrel; 2 - track frame; 3 - limit frame; 4 - limit snap ring; 41 - moving wheel; 5 - clamping component; 51 - base; 52 - expansion block; 521 - avoidance groove; 53 - flap body; 531 - convex block; 54 - piston cavity; 541 - air injection hole; 542 - gasket; 55 - piston; 551 - leakage channel; 552 - connecting rod; 56 - retracting sleeve; 561 - retracting spring; 562 - retaining ring; 57 - receiving groove. Detailed implementation manners

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer, the following further details this application in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0036] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application.

[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of", "several" means two or more, unless otherwise specifically defined.

[0038] Please refer to Figures 1 to 5, the long retractable soot blower of the present application embodiment will be described. A long retractable soot blower for a boiler includes: a main body, a track frame 2, a limit frame 3, a limit snap ring 4, and a clamping assembly 5.

[0039] The main body has a barrel 1 that can extend into the furnace. The track frame 2 is horizontally arranged inside the furnace. The limit frame 3 is arranged parallel above the track frame 2. The limit snap ring 4 is located below the track frame 2 and opposite to the barrel 1. The limit snap ring 4 moves along the track frame 2 through a moving wheel 41. The moving wheel 41 is located between the track frame 2 and the limit frame 3, and the sides are clamped on both sides of the track frame 2 and the limit frame 3 to maintain the stability of both sides of the limit snap ring 4. The clamping assembly 5 is arranged at the front end of the barrel 1 and is adapted to insert into the limit snap ring 4 when the barrel 1 extends into the furnace; the front end of the clamping assembly 5 is a tapered split structure, and a tapered expansion block 52 is arranged in the middle of the split structure. The rear end of the clamping assembly 5 is provided with a piston chamber 54 communicating with the inner cavity of the barrel 1, and a piston 55 is arranged in the piston chamber 54; when the gas in the barrel 1 enters the piston chamber 54 to push the piston 55, the piston 55 pushes the expansion block 52 forward to open the split structure to form a mandrel adapted to the limit snap ring 4.

[0040] Compared with the prior art, the long retractable soot blower of the present application embodiment can provide a limit snap ring 4 that can move stably by arranging a track frame 2 and a limit frame 3 in the furnace; when the barrel 1 of the main body extends into the furnace, the clamping assembly 5 at the front end of the barrel 1 can be inserted into the limit snap ring 4, and the limit snap ring 4 can limit the sway of the front end of the barrel 1 through the clamping assembly 5, thereby avoiding collision;

[0041] The front end of the clamping assembly 5 adopts a tapered split structure. Even if there is a slight sway when the barrel 1 extends, the split structure can still accurately insert into the limit snap ring 4. When high-pressure gas is introduced into the barrel 1, the high-pressure gas pushes the piston 55 to open the split structure to form a mandrel adapted to the limit snap ring 4. The mandrel matches the limit snap ring 4 better, so as to ensure that the clamping assembly 5 rotates more smoothly and stably in the limit snap ring 4, thereby further ensuring the stability of the front end of the barrel 1.

[0042] It should be noted that for the convenience of description, the direction in which the barrel 1 extends into the furnace is the front, and the direction in which the barrel 1 withdraws from the furnace is the rear.

[0043] In this embodiment, the main body can adopt a structure similar to that of a traditional soot blower, and is composed of a frame, a telescopic barrel 1, a carriage, a rack track, a wall box, etc. The main body has a barrel 1 that can be telescopically inserted into the furnace. The front end of the barrel 1 is a nozzle, and spray ports are arranged on both sides of the nozzle. During use, the barrel 1 rotates and extends into the boiler. During the process, the spray ports of the nozzle continuously spray high-pressure gas to blow soot on the heating surface of the boiler.

[0044] The track frame 2 and the limit frame 3 are both horizontally arranged inside the furnace, and their two ends are fixed to the inner wall of the furnace. The track frame 2 and the limit frame 3 are parallel, and a channel with a fixed width is formed in the middle. The moving wheel 41 is on the track frame 2 and moves back and forth along the channel between the track frame 2 and the limit frame 3. The limit frame 3 can prevent the moving wheel 41 from bouncing up and down. Specifically, the distance between the limit frame 3 and the track frame 2 is slightly larger than the diameter of the moving wheel 41.

[0045] The limit clamping ring 4 is hoisted under the track frame 2 through the moving wheel 41. Specifically, the limit clamping ring 4 can be provided with two moving wheels 41, one in front and one behind, to prevent the limit clamping ring 4 from swinging back and forth. The two side surfaces of the moving wheel 41 are expanded into a disc shape, so that the side of the moving wheel 41 is clamped between the two sides of the track frame 2 and the limit frame 3, so that the moving wheel 41 will not shake left and right, and further the limit clamping ring 4 will not shake left and right when moving back and forth.

[0046] The clamping assembly 5 is installed at the front end of the gun barrel 1, and the front end is a tapered split structure, so that the clamping assembly 5 can be accurately inserted into the limit clamping ring 4. The clamping assembly 5 uses a piston 55 to push the split structure to open to form a mandrel, avoiding the mismatch between the tapered split structure and the limit clamping ring 4, and at the same time making full use of high-pressure gas as power, with more sufficient power, so that the opened split structure can withstand greater force. Specifically, the split structure at the front end of the clamping assembly 5 can have three to five lobes 53, Figure 4 Four lobes 53 are used, and each lobe 53 is evenly distributed along the outer periphery of the front end of the clamping assembly 5. In the initial state, each lobe 53 contracts into a cone shape. When the expansion block 52 moves forward, the expansion block 52 will push each lobe 53 outwards, so that each lobe 53 forms an approximately cylindrical mandrel.

[0047] In the specific implementation, the two main bodies are respectively arranged on the opposite sides of the boiler, the two gun barrels 1 respectively extend into the center of the boiler, and when the two gun barrels 1 reach the center position of the boiler, they start to withdraw. The track frame 2 and the limit frame 3 are connected to each other in the middle position, so that the two are connected into a whole to increase the strength, and at the same time, it does not affect the movement of the limit clamping ring 4. The two ends of the track frame 2 are respectively provided with the limit clamping ring 4 through the moving wheel 41, and the two limit clamping rings 4 are respectively used to cooperate with the clamping assemblies 5 of the two gun barrels 1.

[0048] Before ash cleaning, the limit snap ring 4 is docked at the end of the track frame 2 close to the inner wall of the furnace. Before the barrel 1 of the main body extends into the furnace, no high-pressure gas is introduced into the barrel 1. At this time, the conical split structure at the front end of the barrel 1 is in a closed state. When ash cleaning is required, the barrel 1 begins to gradually extend into the furnace. When the nozzle of the barrel 1 enters the furnace, the conical split structure at the front end of the barrel 1 is inserted into the limit snap ring 4. At this time, the valve is opened, and high-pressure gas is introduced into the barrel 1. The high-pressure gas enters the piston chamber 54 of the clamping assembly 5, causing the piston 55 to push the expansion block 52 forward, so that the split structure opens to form a mandrel adapted to the limit snap ring 4. After that, the barrel 1 can continue to move forward and perform ash cleaning according to the normal ash cleaning steps. During the process, since the clamping assembly 5 at the front end of the barrel 1 is restricted by the limit snap ring 4, the swing of the front end of the barrel 1 is greatly reduced.

[0049] Please refer to Figure 1 、 Figure 3 and Figure 5 , as a specific embodiment of the long telescopic soot blower for boilers provided by the present application, the piston 55 is provided with an axially penetrating leakage channel 551, and the front end of the piston chamber 54 is provided with an air injection hole 541 facing the gap of the mandrel.

[0050] The front end face of the piston chamber 54 is provided with an annular gasket 542. When the piston 55 reaches the limit position forward, it is squeezed and sealed with the gasket 542. At this time, the gasket 542 blocks the leakage channel 551.

[0051] In this embodiment, when high-pressure gas begins to be introduced into the barrel 1, the high-pressure gas pushes the piston 55 forward. At the same time, part of the gas will pass through the leakage channel 551 through the piston 55 and enter the front end of the piston chamber 54, and finally be ejected from the air injection hole 541 at the front end of the piston chamber 54. This part of the ejected gas can clean the mandrel and the limit snap ring 4 outside the mandrel through the gap of the mandrel. After a short cleaning, the piston 55 reaches the limit position forward. At this time, the piston 55 is pressed tightly on the gasket 542 to seal the front end of the piston chamber 54, and the leakage channel 551 is blocked by the gasket 542. The pressure of the high-pressure gas in the piston chamber 54 all acts on the piston 55, so that the opened split structure can bear a greater force.

[0052] External operators can confirm whether the piston 55 has reached the limit position forward according to the change of gas pressure, that is, whether the split structure has opened in place to form a mandrel. Specifically, after high-pressure gas is introduced into the barrel 1, if the air pressure in the barrel 1 is always lower than the normal air pressure, it means that the piston 55 has not reached the limit position forward to be sealed with the gasket 542. If the air pressure in the barrel 1 can quickly reach the normal air pressure, it means that the piston 55 has reached the limit position forward to be sealed with the gasket 542.

[0053] In a specific implementation, the leakage channel 551 can be a drilled hole that penetrates the piston 55, or a slot on the edge of the piston 55. The leakage channel 551 and the air injection hole 541 are not opposite to each other in the axial direction of the piston 55, so as to avoid that only the sealing gasket 542 separates the air injection hole 541 between the leakage channel 551, resulting in the sealing gasket 542 being damaged by excessive air pressure. After the conical petal structure is opened, there will be a gap between each petal body 53, that is, the gap of the core shaft.

[0054] See also Figure 4 As a specific implementation of the long telescopic sootblower for a boiler provided in the present application, an avoidance groove 521 for avoiding the jet hole 541 is provided on the expansion block 52 .

[0055] In this embodiment, the high-pressure gas ejected from the jet hole 541 can be smoothly ejected to the core shaft and the limiting clamp ring 4 .

[0056] In a specific implementation, the expansion block 52 may be a tapered block with its small end facing forward, and a plurality of grooves extending from the back to the front are arranged on the surface of the expansion block 52 as avoidance grooves 521 .

[0057] See also Figures 2 to 4 As a specific implementation of the long telescopic sootblower for a boiler provided in the present application, the radial width of the air injection hole 541 gradually increases from the back to the front.

[0058] In this embodiment, the high pressure gas is depressurized and accelerated when passing through the jet hole 541, thereby improving the cleaning ability of the jetted gas flow. The increased radial width of the jet hole 541 also enables the high pressure gas to diffuse radially faster, thereby blowing toward the core shaft and the limiting clamp ring 4 on the outer periphery of the core shaft.

[0059] See also Figures 2 to 4 As a specific embodiment of the long telescopic sootblower for a boiler provided in the present application, the clamping assembly 5 includes a base 51, a piston chamber 54 is arranged at the rear end of the base 51, and the rear end of the piston chamber 54 is open; a through mounting hole is provided at the front end of the barrel 1, the rear end of the base 51 is threadedly connected to the mounting hole, and the rear end of the piston chamber 54 is connected to the inner cavity of the barrel 1.

[0060] The front end of the base 51 is tapered, and an activity space is formed inside. A plurality of receiving grooves 57 are distributed on the periphery, and each receiving groove 57 is connected to the activity space.

[0061] The expansion block 52 is located in the active space, and a connecting rod 552 is provided at the front end of the piston 55. The connecting rod 552 extends from the piston cavity 54 into the active space and connects to the expansion block 52; each petal body 53 of the petal structure is respectively hinged to the base 51 and is respectively retracted into each accommodating groove 57, and the back side of each petal body 53 is in conflict with the conical surface of the expansion block 52.

[0062] In this embodiment, the rear end of the base 51 is threadedly connected to the front end of the barrel 1, so that the open rear end of the piston chamber 54 is directly communicated with the inner cavity of the barrel 1 through the mounting hole, which simplifies the structure and makes disassembly and replacement more convenient.

[0063] The front end of the base 51 is conical, and each lobe 53 is retracted into each receiving groove 57, so that when the clamping assembly 5 is inserted into the limit retaining ring 4, collision of each lobe 53 can be avoided.

[0064] The movable space inside the base 51 is for the expansion block 52 to move back and forth. A communication hole is provided at the front end of the piston chamber 54 and extends straight to the movable space, so that the connecting rod 552 at the front end of the piston 55 extends into the movable space through the communication hole and is connected to the expansion block 52, so that the piston 55 and the expansion block 52 move synchronously.

[0065] In a specific implementation, the rear end of the base 51 is cylindrical, and the front end can be machined to form the movable space and the receiving groove 57, or the movable space and the receiving groove 57 can be formed by welding a bracket on the basis of the cylindrical rear end.

[0066] Please refer to Figure 2 and Figure 3 , as a specific implementation manner of the boiler long telescopic soot blower provided by the present application, convex blocks 531 are respectively provided on the outer sides of the front ends of the lobes 53 of the split structure. When the split structure expands to form a mandrel adapted to the limit retaining ring 4, each convex block 531 is limited to the front side of the limit retaining ring 4.

[0067] In this embodiment, after the expansion block 52 moves forward to push each lobe 53 outwards, the convex block 531 on the front end of each lobe 53 is stuck on the front side of the limit retaining ring 4, which can prevent the limit retaining ring 4 from slipping off from the front end of the mandrel.

[0068] Please refer to Figure 2 and Figure 3 , as a specific implementation manner of the boiler long telescopic soot blower provided by the present application, a closing spring 561 and a closing sleeve 56 are sleeved on the outer periphery of the base 51, and the closing spring 561 pushes the closing sleeve 56 forward to close the split structure.

[0069] A retaining ring 562 is further provided on the outer periphery of the closing sleeve 56, and the outer diameter of the retaining ring 562 is larger than the inner diameter of the limit retaining ring 4. After the clamping assembly 5 is inserted into the limit retaining ring 4, when the barrel 1 continues to extend forward, the limit retaining ring 4 pushes the closing sleeve 56 backward and compresses the closing spring 561, so that the split structure can expand.

[0070] In this embodiment, when there is no high-pressure gas in the gun barrel 1, the folding spring 561 pushes the folding sleeve 56 forward, folding each petal body 53 inward, and the back of each petal body 53 pushes the conical expansion block 52 to move backward, and finally each petal body 53 is folded into a cone. After the clamping assembly 5 is inserted into the limit clamp ring 4, the gun barrel 1 continues to extend forward so that the limit clamp ring 4 pushes the folding sleeve 56 backward through the retaining ring 562, compressing the folding spring 561, so that the folding sleeve 56 no longer restricts each petal body 53, and then, the gun barrel 1 is introduced with high-pressure gas, so that the expansion block 52 pushes each petal body 53 to open outward.

[0071] In a specific implementation, the protrusions 531 on the front ends of the petals 53 may also be slightly inclined forward. When the barrel 1 is depressurized, the barrel 1 retreats, and the clamping assembly 5 withdraws from the limiting clamp ring 4, the limiting clamp ring 4 may also press the petals 53 inwards through the protrusions 531, so that the petals 53 are more easily retracted by the retracting sleeve 56.

[0072] See also Figure 1 As a specific embodiment of the long telescopic sootblower for a boiler provided in the present application, the end of the track frame 2 close to the inner wall of the furnace is inclined downward so that the limiting clamp ring 4 has a downward sliding tendency close to the inner wall of the furnace, and when the barrel 1 extends forward, the downward sliding tendency causes the limiting clamp ring 4 to form a force sufficient to push the closure sleeve 56 backward and compress the closure spring 561.

[0073] In this embodiment, when the gun barrel 1 exits the furnace, the gun barrel 1 will drive the limit snap ring 4 to retreat to the end of the track frame 2 close to the inner wall of the furnace, and then the gun barrel 1 will release pressure and exit from the furnace, while the limit snap ring 4 will be left at the end of the track frame 2. The end of the track frame 2 is tilted downward, so that the limit snap ring 4 can be stably maintained at a position close to the inner wall of the furnace, waiting for the next time the gun barrel 1 is extended. When the gun barrel 1 is extended again, after the clamping assembly 5 is inserted into the limit snap ring 4, the end of the track frame 2 is tilted downward so that the limit snap ring 4 has a certain resistance, and this resistance enables the limit snap ring 4 to push the folding sleeve 56 backward and compress the folding spring 561 when the gun barrel 1 continues to extend forward, so that the folding sleeve 56 no longer restricts each petal body 53, and then, high-pressure gas is introduced into the gun barrel 1, so that the expansion block 52 can push each petal body 53 to open outward.

[0074] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. Long telescopic soot blower for boiler, characterized in that, Comprising: A main body having a barrel that can extend into the furnace chamber; A track frame horizontally disposed inside the furnace chamber; A limit frame disposed parallel above the track frame; A limit snap ring located below the track frame and opposite to the barrel. The limit snap ring moves along the track frame through a moving wheel. The moving wheel is located between the track frame and the limit frame, and the side is clamped between the two sides of the track frame and the limit frame to maintain the stability of both sides of the limit snap ring; A clamping assembly disposed at the front end of the barrel and adapted to insert into the limit snap ring when the barrel extends into the furnace chamber; the front end of the clamping assembly is a conical split structure, and a conical expansion block is provided in the middle of the split structure. A piston chamber communicating with the inner cavity of the barrel is provided at the rear end of the clamping assembly, and a piston is provided in the piston chamber; when the gas in the barrel enters the piston chamber to push the piston, the piston pushes the expansion block forward to open the split structure to form a mandrel adapted to the limit snap ring; The clamping assembly includes a base. The piston chamber is disposed at the rear end of the base, and the rear end of the piston chamber is open; a through mounting hole is provided at the front end of the barrel, and the rear end of the base is threadedly connected to the mounting hole, and the rear end of the piston chamber communicates with the inner cavity of the barrel; The front end of the base is conical, and an activity space is formed inside, and a plurality of receiving grooves are distributed on the outer periphery. Each of the receiving grooves communicates with the activity space respectively; The expansion block is located in the activity space. A connecting rod is provided at the front end of the piston. The connecting rod extends from the piston chamber into the activity space and connects the expansion block; each lobe of the split structure is respectively hinged to the base and respectively retracted into each of the receiving grooves. The back surface of each lobe abuts against the conical surface of the expansion block.

2. The long retractable soot blower for boiler according to claim 1, characterized in that, The piston is provided with an axially through leakage channel, and an air jet hole is provided at the front end of the piston chamber facing the gap of the mandrel; A ring-shaped gasket is provided on the front end face of the piston chamber. When the piston reaches the limit position forward, it is squeezed and sealed with the gasket. At this time, the gasket blocks the leakage channel.

3. The long retractable soot blower for boiler according to claim 2, wherein, An avoidance groove for avoiding the air jet hole is provided on the expansion block.

4. The long retractable soot blower for boiler according to claim 2, wherein The radial width of the air jet hole gradually becomes larger from the rear to the front.

5. The long retractable soot blower for boilers according to claim 1, characterized in that, Convex blocks are respectively provided on the outer sides of the front ends of the lobes of the split structure. When the split structure opens to form a mandrel adapted to the limit snap ring, each of the convex blocks is limited to the front side of the limit snap ring.

6. The boiler long retractable soot blower according to claim 5, characterized in that, A closing spring and a closing sleeve are sleeved on the outer periphery of the base. The closing spring pushes the closing sleeve forward to close the split structure by the closing sleeve; A retaining ring is further provided on the outer periphery of the closing sleeve. The outer diameter of the retaining ring is larger than the inner diameter of the limit snap ring. After the clamping assembly is inserted into the limit snap ring, when the barrel continues to extend forward, the limit snap ring pushes the closing sleeve backward and compresses the closing spring so that the split structure can open.

7. The long retractable soot blower for boiler according to claim 6, characterized in that, The end of the rail frame close to the inner wall of the furnace hearth inclines downward, so that the limit snap ring has a downward sliding tendency close to the inner wall of the furnace hearth, and when the barrel extends forward, this downward sliding tendency enables the limit snap ring to form a force sufficient to push the closing sleeve backward and compress the closing spring.

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