A circular pipeline ash removal device, ash removal method and application

Abstract

This invention discloses a circular pipe cleaning device, cleaning method, and application, belonging to the field of auxiliary tools for carbon fiber production equipment, to solve the problems of difficult and incomplete cleaning of long-distance circular exhaust gas pipes. The circular pipe cleaning device of this invention includes a scraper assembly, coaxially sleeved inner and outer pipe assemblies, a front positioning component, and a rear positioning component. The scraper assembly includes at least two sets of radially openable scrapers, each comprising multiple inner fan-shaped scrapers and multiple outer fan-shaped scrapers. The inner and outer fan-shaped scrapers are spaced 10-20 mm apart axially and staggered circumferentially, forming a stepped double-scraper cleaning structure. The inner and outer pipe assemblies can move relative to each other axially, and their axial lengths can be adjusted according to the actual length of the circular pipe. Both the front and rear positioning components are used to fix the scraper assembly. This invention enables efficient and thorough cleaning of exhaust gas pipes in carbon fiber production lines.

Description

Technical Field

[0001] This invention belongs to the field of auxiliary tools for carbon fiber production equipment, and particularly relates to a circular pipe cleaning device, cleaning method and application. Background Technology

[0002] During carbon fiber production, polyacrylonitrile precursor fibers generate a large amount of waste gas during processing in low-temperature and high-temperature furnaces. This waste gas enters the incinerator through waste gas pipes. However, dust in the waste gas adheres to and gradually accumulates on the inner wall of the pipes, causing the inner diameter of the pipes to narrow, reducing the waste gas delivery volume, and ultimately affecting the quality of the carbon fiber products.

[0003] In existing technologies, because exhaust gas pipelines are typically quite long (10-20m), cleaning operations are very inconvenient, and it is difficult to thoroughly clean the entire inner wall of the pipeline. Traditional cleaning methods require disassembling the entire pipeline into many sections and then using a hoe-shaped tool to clean each section one by one. When using a hoe-shaped tool to clean dust on the sides and top, not only is it necessary to scrape vigorously, but the weight of the hoe-shaped tool itself must also be overcome, making the cleaning process time-consuming, labor-intensive, and difficult to thoroughly clean the pipeline. Summary of the Invention

[0004] Based on the above analysis, the embodiments of the present invention aim to provide a circular pipe cleaning device, cleaning method and application to solve the problems of difficult and incomplete cleaning of long-distance circular exhaust gas pipes in the prior art.

[0005] The objective of this invention is mainly achieved through the following technical solutions: On one hand, the present invention provides a circular pipe cleaning device, including a scraper assembly, an inner pipe assembly and an outer pipe assembly coaxially sleeved, a front positioning component, and a rear positioning component; The scraper assembly includes at least two sets of radially openable scrapers, each scraper comprising a plurality of inner fan-shaped scrapers and a plurality of outer fan-shaped scrapers; The inner and outer fan-shaped scrapers are spaced 10-20mm apart along the axial direction and staggered along the circumference, forming a stepped double scraper cleaning structure along the axial direction. The inner tube assembly and the outer tube assembly can move relative to each other axially, and their axial lengths can be adjusted according to the actual length of the circular pipe. Both the front and rear positioning parts are used to fix the scraper assembly. Through the relative axial movement of the inner tube assembly and the outer tube assembly, the front and rear positioning parts achieve synchronous relative axial movement. At the same time, the scraper assembly can switch between the retracted state and the open state. When the scraper assembly is in the retracted state, the dust removal device is sent into the circular exhaust gas duct; the inner tube assembly is driven to move axially relative to the outer tube assembly, causing the scraper assembly to open and fit against the inner wall of the circular exhaust gas duct; the dust removal device is dragged, and the scraper assembly is used to remove the dust in the duct.

[0006] In one possible design, one end of the inner tube assembly and the outer tube assembly is a working end, and the other end is a handheld end; at the working end of the inner tube assembly and the outer tube assembly, the working end of the inner tube assembly protrudes forward to form an extension section; the front positioning member is sleeved on the extension section of the inner tube assembly, and the rear positioning member is sleeved on the outer tube assembly.

[0007] In one possible design, the aforementioned circular pipe cleaning device also includes a connecting rod assembly; The connecting rod assembly is used to connect the inner tube assembly, the outer tube assembly, and the scraper assembly.

[0008] In one possible design, the aforementioned circular pipe cleaning device also includes an operating component; The operating element is located at the handheld end of the inner tube assembly and the outer tube assembly. The operating element cooperates with the inner tube assembly and the outer tube assembly to drive the inner tube assembly to move axially relative to the outer tube assembly.

[0009] In one possible design, the aforementioned rear positioning component includes a hollow annular first rear positioning disk and a second rear positioning disk with identical structures. The first rear positioning disk and the second rear positioning disk are coaxially and parallel to each other on the working end of the outer tube assembly. The front positioning component includes a hollow annular first front positioning disk and a second front positioning disk with the same structure. The first front positioning disk and the second front positioning disk are coaxially sleeved on the extension section of the inner tube assembly in parallel and adjacent manner. The first and second rear positioning plates are locked together by the first locking nut; the first and second front positioning plates are locked together by the second locking nut.

[0010] In one possible design, the linkage assembly includes multiple sets of first links, second links, first connecting pins, second connecting pins, first cotter pins, and second cotter pins.

[0011] In one possible design, the inner fan-shaped scraper and the outer fan-shaped scraper each have hinge points at their top and middle parts; The middle part of the inner fan-shaped scraper is hinged to the first connecting rod via the first connecting pin, and its top end is hinged to the first front positioning plate via the first connecting pin; the middle part of the outer fan-shaped scraper is hinged to the second connecting rod via the second connecting pin, and its top end is hinged to the second front positioning plate via the second connecting pin. The first connecting pin is fixed by the first cotter pin, and the second connecting pin is fixed by the second cotter pin.

[0012] In one possible design, positioning rings are respectively fitted on the outer tube assembly and the extension of the inner tube assembly, and positioning pins are evenly distributed around the circumference of the positioning rings; positioning pin holes are provided on the front positioning member and the rear positioning member respectively, and the radial rotation of the front positioning member and the rear positioning member is restricted by the cooperation between the positioning pins and the positioning pin holes.

[0013] In one possible design, the operating components include an adjusting handle and a limit screw; The adjustment handle is a hollow cylindrical shape and is coaxially sleeved on the outer tube assembly. The end of the adjustment handle away from the hand-held end is provided with an internal thread, the outer tube assembly is provided with an external thread, and the adjustment handle is threadedly connected to the outer tube assembly. The adjustment handle has an inner hole on its hand-held end face, and the inner tube assembly has a circular boss on its hand-held end face. The circular boss can be embedded in the inner hole, and the outer diameter of the circular boss is smaller than the inner hole diameter. The outer diameter of the head of the limiting screw is larger than the inner hole diameter, forming an axial limit. The connection between the adjustment handle and the inner tube assembly is a clearance fit, and the two can rotate relative to each other.

[0014] On the other hand, the present invention also provides a method for cleaning a circular pipe, which uses the above-mentioned circular pipe cleaning device for cleaning.

[0015] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: (1) The scraper assembly of the present invention includes multiple sets of inner fan-shaped scrapers and outer fan-shaped scrapers. The inner and outer fan-shaped scrapers are spaced 10-20mm apart axially and staggered circumferentially to form a stepped double scraper cleaning structure. The inner fan-shaped scrapers perform rough cleaning first, and the outer fan-shaped scrapers then perform fine cleaning on the areas not cleaned by the inner fan-shaped scrapers, realizing two cleaning processes to avoid incomplete cleaning. At the same time, the multiple sets of inner and outer fan-shaped scrapers are staggered circumferentially to cover the entire circumference of the circular pipe and eliminate cleaning dead corners.

[0016] (2) This invention, through the nested structure of the inner and outer pipe components and the design that allows for the connection of n sections of the inner pipe and n sections of the outer pipe, enables flexible adjustment of the axial length of the dust removal device. This design solves the problem that traditional dust removal tools cannot adapt to cleaning long-distance pipelines (10-20m), eliminating the need to disassemble long pipelines into multiple sections for cleaning, greatly improving the convenience and efficiency of dust removal operations, and reducing labor intensity and cleaning costs. At the same time, it also avoids equipment damage caused by pipeline disassembly.

[0017] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0018] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0019] Figure 1a A schematic diagram of the overall structure of the dust removal device provided by the present invention; Figure 1b for Figure 1a A bottom view; Figure 2a A schematic diagram showing the scraper assembly provided by the present invention in a retracted state; Figure 2b A schematic diagram of the scraper assembly provided by the present invention in an open state; Figure 3 A schematic diagram of the dust removal device provided by the present invention being fed into a circular pipe (exhaust gas pipe); Figure 4a A schematic diagram of the dust removal device provided by the present invention in operation; Figure 4b Schematic diagram 2 of the dust removal device provided by the present invention during operation; Figure 5 An exploded view of the ash removal device provided by the present invention; Figure 6 This is a schematic diagram of the inner and outer tubes of the present invention; Figure 7 This is a schematic diagram of the structure of the n-segment inner pipe and the n-segment outer pipe provided by the present invention; Figure 8 This is a schematic diagram of the scraper assembly provided by the present invention; Figure 9 This is a schematic diagram of the structure of the front positioning component provided by the present invention; Figure 10a A schematic diagram illustrating the use of hoes to clean exhaust gas pipes using existing technology; Figure 10b Schematic diagram 2 shows the existing technology of using hoes to clean exhaust gas pipes.

[0020] Figure label: 1-Scraper assembly; 1.1-Inner fan-shaped scraper; 1.2-Outer fan-shaped scraper; 2-Limit screw; 3-Adjusting handle; 4-n-section outer connecting pipe; 5-n-section inner connecting pipe; 6-Inner pipe; 7-Outer pipe; 8-First rear positioning plate; 9-First connecting rod; 10-First cotter pin; 11-First connecting pin; 12-Second front positioning plate; 13-Second locking nut; 14-First locking nut; 15-Circular pipe; 16-Dust inside the pipe; 17-First front positioning plate; 18-Second rear positioning plate; 19-Second connecting rod; 20-Second connecting pin; 21-Second cotter pin; 22-First positioning ring; 23-Second positioning ring; 24-First positioning pin; 25-Second positioning pin; 26-Flexible scraping layer; 27-Cylindrical section; 28-Reinforcing pin. Detailed Implementation

[0021] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0022] It should be noted that within the circular pipe 15, the direction in which the cleaning device extends from the pipe inlet into the pipe is defined as "forward," and the opposite direction is "rear." Specifically, when the cleaning device is inserted into the circular pipe 15, the end that first enters the pipe is the "front end" or "working end," and the end closest to the operator's hand is the "rear end" or "handheld end." When the scraper assembly 1 performs cleaning operations within the pipe, its movement inward along the pipe axis is considered "forward," and its retraction towards the pipe inlet is considered "rear."

[0023] On one hand, the present invention provides a dust removal device for a circular pipe 15, as shown in Figures 1 to 12. Figure 9As shown, it includes a scraper assembly 1, a coaxially sleeved inner tube assembly 6 and outer tube assembly 7, a front positioning component, and a rear positioning component; the scraper assembly 1 includes at least two sets of radially openable scrapers, each scraper including multiple inner fan-shaped scrapers 1.1 and multiple outer fan-shaped scrapers 1.2; the inner fan-shaped scrapers 1.1 and outer fan-shaped scrapers 1.2 are spaced 10-20mm apart axially and staggered circumferentially, forming a stepped double scraper cleaning structure axially; the inner tube assembly 6 and outer tube assembly 7 can move relative to each other axially, and both can adjust their length according to the actual length of the circular pipe 15. Axial length; both the front and rear positioning parts are used to fix the scraper assembly 1. Through the relative axial movement of the inner tube 6 assembly and the outer tube 7 assembly, the front and rear positioning parts achieve synchronous relative axial movement. At the same time, the scraper assembly 1 can switch between a retracted state and an open state. When the scraper assembly 1 is in the retracted state, the dust removal device is sent into the circular exhaust gas pipe. The inner tube 6 assembly is driven to move axially relative to the outer tube 7 assembly, which drives the scraper assembly 1 to open. The outer edge of the scraper assembly 1 elastically fits against the inner wall of the circular pipe 15. The dust removal device is dragged, and the dust 16 in the pipe is removed by the scraper assembly 1.

[0024] Specifically, the scraper assembly 1 of the present invention employs multiple sets of radially openable inner fan-shaped scrapers 1.1 and outer fan-shaped scrapers 1.2. The inner fan-shaped scrapers 1.1 and outer fan-shaped scrapers 1.2 are spaced 10-20mm apart axially and staggered circumferentially, so that the inner fan-shaped scrapers 1.1 and outer fan-shaped scrapers 1.2 form a stepped double scraper cleaning structure axially. For example, the staggered angle of adjacent inner fan-shaped scrapers 1.1 and outer fan-shaped scrapers 1.2 in the circumferential direction is 30-60°. This staggered design allows the inner fan-shaped scrapers 1.1 and outer fan-shaped scrapers 1.2 to form two continuous and complementary cleaning barriers axially when the scraper assembly 1 is opened and fits against the inner wall of the pipe.

[0025] It should be noted that the misalignment angle between the outer fan-shaped scraper 1.2 and the inner fan-shaped scraper 1.1 is determined by the number of both.

[0026] For example, four inner fan-shaped scrapers 1.1 are evenly distributed circumferentially, each occupying a 90° central angle. Similarly, there are four outer fan-shaped scrapers 1.2, with each outer fan-shaped scraper 1.2's starting position offset or misaligned 45° circumferentially from the inner fan-shaped scrapers 1.1. This ensures that the gaps between the inner fan-shaped scrapers 1.1 are completely covered by the outer fan-shaped scrapers 1.2, achieving 360° cleaning of the pipe's inner wall without any blind spots. Alternatively, as... Figure 8As shown, there are 6 inner fan-shaped scrapers 1.1 evenly distributed in the circumference, with each inner fan-shaped scraper 1.1 occupying a 60° central angle. Similarly, there are 6 outer fan-shaped scrapers 1.2, and the starting position of each outer fan-shaped scraper 1.2 is offset or staggered by 30° in the circumference relative to the inner fan-shaped scrapers 1.1. In this way, the gaps between the inner fan-shaped scrapers 1.1 are exactly covered by the outer fan-shaped scrapers 1.2, thereby achieving 360° cleaning of the inner wall of the pipe without dead angles.

[0027] It should also be noted that the present invention, through the radial opening and closing function of the scraper assembly 1, can adapt to the inner diameter of the circular pipe 15 (i.e., the exhaust pipe); by designing the inner fan-shaped scraper 1.1 and the outer fan-shaped scraper 1.2 to be spaced 10-20mm apart axially, the inner fan-shaped scraper 1.1 cleans first, and then the outer fan-shaped scraper 1.2 removes the areas not cleaned by the inner fan-shaped scraper 1.1, forming two cleaning processes to avoid incomplete cleaning; in addition, the present invention, through the circumferential staggered arrangement of multiple sets of inner fan-shaped scrapers 1.1 and multiple sets of outer fan-shaped scrapers 1.2, can cover the entire circumference of the circular pipe 15, eliminating cleaning dead corners. In the aforementioned coaxially sleeved inner tube 6 assembly and outer tube 7 assembly, the inner tube 6 assembly is the core drive shaft, which provides the basis for axial movement. The outer tube 7 assembly is the external support sleeve, which forms a sliding fit with the inner tube 6 assembly. The two can move axially relative to each other, and the axial length can be adjusted according to the actual length of the circular pipe 15 to adapt to different working conditions (e.g., different pipe lengths). The front positioning member and the rear positioning member of the present invention are respectively set at the front end and rear end of the dust removal device. Both the front positioning member and the rear positioning member are used to fix and support the scraper assembly 1, which provides a stable structural basis for the opening and closing movement of the scraper assembly 1. In addition, the aforementioned front and rear positioning components are used to fix the scraper assembly 1. Through the relative axial movement of the inner tube 6 assembly and the outer tube 7 assembly, the front and rear positioning components achieve synchronous relative axial movement. At the same time, the scraper assembly 1 can switch between a retracted state and an open state. When the scraper assembly 1 is in the retracted state, the dust removal device is sent into the circular exhaust gas pipe. The inner tube 6 assembly is driven to move axially relative to the outer tube 7 assembly, causing the scraper assembly 1 to open. The outer edge of the scraper assembly 1 elastically fits against the inner wall of the circular pipe 15. The dust removal device is dragged, and the dust 16 in the pipe is removed by the scraper assembly 1.

[0028] Compared with existing technologies, this invention, through the circumferentially staggered arrangement of the inner fan-shaped scraper 1.1 and the outer fan-shaped scraper 1.2, ensures that the scraper assembly 1 can cover the entire inner circumference of the circular pipe 15 during cleaning, avoiding uncleaned "dead corner" areas. Compared with existing hoe cleaning tools (such as... Figure 10a and Figure 10bThis invention can significantly improve the thoroughness of cleaning, ensuring that the dust 16 on the inner wall of the exhaust pipe can be completely removed, thereby maintaining the exhaust gas delivery volume and the quality of carbon fiber products; by adjusting the length of the inner pipe 6 assembly and the outer pipe 7 assembly, this invention enables the dust removal device to adapt to the cleaning needs of circular pipes 15 of different lengths.

[0029] The circular pipe 15 dust removal device of the present invention does not require suspension operation during use, so there will be no extra output due to the influence of the tool's own weight when removing dust 16 in the exhaust gas pipe.

[0030] To achieve the goal of adjusting the axial length of the cleaning device according to the actual length of the circular pipe 15, the inner pipe 6 assembly of the present invention includes an inner pipe 6 and n sections of inner connecting pipe 4 (n is an integer), and the outer pipe 7 assembly includes an outer pipe 7 and n sections of outer connecting pipe 4 (n is an integer). One end of each n section of inner connecting pipe 4 has an external thread for connection to the inner pipe 6, and the other end has an internal thread for connection to a screw or another section of inner connecting pipe. One end of each n section of outer connecting pipe 4 has a swivel nut for connection to the outer pipe 7, and the other end has an external thread for connection to an adjusting handle or another section of outer connecting pipe. When the n sections of inner connecting pipe 4 and the n sections of outer connecting pipe 4 are connected, the adjusting handle and the limiting screw 3 are respectively connected to the corresponding n sections of outer connecting pipe 4 and n sections of inner connecting pipe 4.

[0031] Compared with existing technologies, this invention, through the nested structure of the inner pipe 6 components and the outer pipe 7 components, and the design that allows for the connection of n sections of inner pipe 4 and n sections of outer pipe 4, enables flexible adjustment of the axial length of the dust removal device. This design solves the problem that traditional dust removal tools cannot adapt to cleaning long-distance pipelines (10-20m), eliminating the need to disassemble long pipelines into multiple sections for cleaning, greatly improving the convenience and efficiency of dust removal operations, and reducing labor intensity and cleaning costs. At the same time, it also avoids equipment damage caused by pipeline disassembly.

[0032] For example, the present invention has 6 inner fan-shaped scrapers 1.1 and 6 outer fan-shaped scrapers 1.2. The inner fan-shaped scrapers 1.1 are evenly distributed on the circumference, while the outer fan-shaped scrapers 1.2 are evenly distributed on the circumference after being staggered at a certain angle (20-30°). In this way, when the dust removal device moves, the area not touched by the inner fan-shaped scrapers 1.1 will be covered and cleaned by the outer fan-shaped scrapers 1.2, thereby achieving 360° cleaning without omission.

[0033] It should be noted that the inner fan-shaped scraper 1.1 and the outer fan-shaped scraper 1.2 form an inward inclination angle of 10-55° with the inner wall of the pipe. When the scraper assembly 1 is in the fully open state, the inward inclination angle α between the inner fan-shaped scraper 1.1 and the outer fan-shaped scraper 1.2 and the inner wall of the pipe is 10°; when the scraper assembly 1 is in the closed state, the inward inclination angle α between the inner fan-shaped scraper 1.1 and the outer fan-shaped scraper 1.2 and the inner wall of the pipe is 55°.

[0034] Maintaining the inward angle α between the inner fan-shaped scraper 1.1 and the outer fan-shaped scraper 1.2 and the inner wall of the pipe within the range of 10-55° is crucial. When encountering dust 16 clumps and performing impact cleaning, this inward angle ensures that the scraper assembly 1 will not flip outward under impact force, but will always maintain an elastic fit with the inner wall of the pipe. This effectively prevents the scraper assembly 1 from detaching from the inner wall of the pipe due to improper force, thus ensuring the continuity of cleaning. Especially when dealing with stubborn clumps, it can remove dust 16 more stably and efficiently, reducing the difficulty of operation and the risk of incomplete cleaning.

[0035] It should be noted that the inner fan-shaped scraper 1.1 and the outer fan-shaped scraper 1.2 are provided with a flexible scraping layer 26 with a thickness of 1-3mm on the side that contacts the inner wall of the pipe.

[0036] The aforementioned flexible scraping layer 26 is made of a highly elastic, wear-resistant, and high-temperature resistant polymer material (such as special silicone rubber or fluororubber). The flexible scraping layer 26 extends outward by 2-5 mm along the outer edges of the inner fan-shaped scraper 1.1 and the outer fan-shaped scraper 1.2, respectively, to form a flexible lip structure.

[0037] Compared to existing technologies, this invention, through the design of a flexible scraping layer 26 and a flexible lip structure, effectively enhances the tightness of the fit between the scraper assembly 1 and the inner wall of the pipe. Even if the inner wall of the pipe has irregular shapes (minor bumps or local deformations), the flexible scraping layer 26 can undergo local deformation to adaptively fill gaps, ensuring full contact with the inner wall of the pipe and ultimately achieving comprehensive cleaning. Furthermore, this flexible contact method avoids hard friction, effectively protecting the inner wall of the pipe. In addition, the flexible material has excellent wear resistance and high-temperature resistance, maintaining stable scraping performance even under long-term use and in high-temperature exhaust gas environments, ensuring the durability of the cleaning device. When the operator drags the cleaning device along the axial direction of the pipe, the flexible scraping layer 26 adapts to the inner wall of the pipe, undergoing corresponding elastic deformation when encountering protrusions or depressions, ensuring a tight fit with the inner wall of the pipe at all times, preventing missed scraping due to minor unevenness of the inner wall.

[0038] In order to fix the front positioning member and the rear positioning member, one end of the inner tube 6 assembly and the outer tube 7 assembly of the present invention is a working end and the other end is a handheld end; at the working end of the inner tube 6 assembly and the outer tube 7 assembly, the working end of the inner tube 6 assembly protrudes forward to form an extension section; the front positioning member is sleeved on the extension section of the inner tube 6 assembly and the rear positioning member is sleeved on the outer tube 7 assembly.

[0039] The circular pipe 15 cleaning device of the present invention also includes a connecting rod assembly, which is used to connect the inner pipe 6 assembly, the outer pipe 7 assembly and the scraper assembly 1.

[0040] Specifically, the linkage assembly includes multiple sets of linkages; one end of each linkage is hinged to the middle position of the scraper assembly 1, and the other end is hinged to the rear positioning member, while the top of the scraper assembly 1 is also hinged to the front positioning member; as a key motion transmission mechanism, the linkage assembly can stably convert the axial linear motion of the inner tube 6 assembly driven by the operating member relative to the outer tube 7 assembly into the radial opening and closing motion of the scraper assembly 1. This transmission method has a simple structure, requires no external power source, reduces the complexity and failure rate of the device, and ensures the synchronicity of the opening and closing action of the scraper assembly 1, enabling the device to accurately complete the retraction and opening of the scraper assembly 1, thereby improving the dust removal efficiency.

[0041] To fix the inner fan-shaped scraper 1.1 and the outer fan-shaped scraper 1.2, the rear positioning component of the present invention includes a hollow annular first rear positioning disk 8 and a second rear positioning disk 18 with the same structure. The first rear positioning disk 8 and the second rear positioning disk 18 are coaxially sleeved on the working end of the outer tube 7 assembly in parallel and adjacent positions. The front positioning component includes a hollow annular first front positioning disk 17 and a second front positioning disk 12 with the same structure. The first front positioning disk 17 and the second front positioning disk 12 are coaxially sleeved on the extension section of the inner tube 6 assembly in parallel and adjacent positions. The first rear positioning disk 8 and the second rear positioning disk 18 are locked by a first locking nut 14. The first front positioning disk 17 and the second front positioning disk 12 are locked by a second locking nut 13.

[0042] Specifically, the first rear positioning disc 8 and the second rear positioning disc 18 are coaxially sleeved on the outer tube 7 and close to the working end of the outer tube 7. The adjacent end faces of the first rear positioning disc 8 and the second rear positioning disc 18 are fitted together and locked with the first locking nut 14 to prevent the first rear positioning disc 8 and the second rear positioning disc 18 from moving axially. Similarly, the first front positioning disc 17 and the second front positioning disc 12 are coaxially sleeved on the extension section of the inner tube 6. The adjacent end faces of the first front positioning disc 17 and the second front positioning disc 12 are fitted together and locked with the second locking nut 13 to prevent the first front positioning disc 17 and the second front positioning disc 12 from moving axially.

[0043] Compared with the prior art, the present invention provides a more stable installation foundation for the scraper assembly 1 and the connecting rod assembly by setting the front and rear positioning components as identical and parallel adjacent double-disc structures (first front positioning disc 17 and second front positioning disc 12, first rear positioning disc 8 and second rear positioning disc 18) and locking them with corresponding locking nuts. This double-disc clamping fixing method enhances the stability of the connection between the front and rear positioning components and the inner tube 6 assembly and the outer tube 7 assembly, effectively preventing the front and rear positioning components from shaking or shifting during the dust removal operation, thereby ensuring that the scraper assembly 1 can always maintain a stable working posture and improving the reliability of the dust removal effect. At the same time, the double-disc structure also provides more ample installation space and more stable support points for the hinge of the connecting rod assembly, making the movement of the connecting rod smoother and further ensuring the accuracy of the opening and closing action of the scraper assembly 1.

[0044] It should be noted that a reinforcing pin 28 hole is also provided on the extension section of the inner tube 6. A reinforcing pin 28 is provided in the reinforcing pin 28 hole and the reinforcing pin 28 is used to fix the first locking nut 14 mentioned above.

[0045] It should be explained that when both the inner fan-shaped scraper 1.1 and the outer fan-shaped scraper 1.2 consist of 6 pieces, the structures of the front and rear positioning parts are basically the same, with the only difference being the inner hole size. For example... Figure 9 As shown, taking the front positioning component as an example, the entire front positioning component is a circular plate structure with a central through hole for the inner tube 6 assembly to pass through. Multiple hinge holes for hinged connection with the connecting rod assembly are evenly distributed circumferentially along the edge of the front positioning component. The number and position of these hinge holes correspond to the number of inner fan-shaped scrapers 1.1 or outer fan-shaped scrapers 1.2 in the scraper assembly 1, so as to achieve connection with the middle part of the scraper assembly 1 through the connecting rod assembly.

[0046] The front and rear positioning components of the present invention have the same structure for the first front positioning disk 17 and the second front positioning disk 12, and the same structure for the first rear positioning disk 8 and the second rear positioning disk 18; the only difference between the first front positioning disk 17 and the second front positioning disk 12 and the first rear positioning disk 8 and the second rear positioning disk 18 is the size of their inner holes.

[0047] The linkage assembly of the present invention includes multiple sets of first linkages 9, second linkages 19, first connecting pins 11, second connecting pins 20, first cotter pins 10, and second cotter pins 21. Furthermore, the inner fan-shaped scraper 1.1 and the outer fan-shaped scraper 1.2 each have hinge points at their top and middle portions; the middle portion of the inner fan-shaped scraper 1.1 is hinged to the first linkage 9 via the first connecting pin 11, and its top portion is hinged to the first front positioning plate 17 via the first connecting pin 11; the middle portion of the outer fan-shaped scraper 1.2 is hinged to the second linkage 19 via the second connecting pin 20, and its top portion is hinged to the second front positioning plate 12 via the second connecting pin 20; the first connecting pin 11 is fixed by the first cotter pin 10, and the second connecting pin 20 is fixed by the second cotter pin 21.

[0048] Specifically, when the inner tube 6 assembly moves forward axially relative to the outer tube 7 assembly, the extension of the inner tube 6 assembly drives the front positioning members (first front positioning disc 17 and second front positioning disc 12) to move forward synchronously. Since the top of the inner fan-shaped scraper 1.1 is hinged to the first front positioning disc 17 and the top of the outer fan-shaped scraper 1.2 is hinged to the second front positioning disc 12, the forward movement of the front positioning members will apply a forward pulling force to the top of the scraper assembly 1. At the same time, the middle part of the inner fan-shaped scraper 1.1 is hinged to the rear positioning member (first rear positioning disc 8) through the first connecting rod 9, and the middle part of the outer fan-shaped scraper 1.2 is hinged to the rear positioning member (second rear positioning disc 18) through the second connecting rod 19, and the rear positioning member is sleeved on the outer tube 7 assembly and remains relatively stationary. At this time, the forward movement of the front positioning member causes the two ends of the first link 9 and the second link 19 to rotate around the hinge point of the rear positioning member and the middle hinge point of the scraper assembly 1, respectively. Since the lengths of the first link 9 and the second link 19 remain unchanged, their movement trajectory will force the middle part of the scraper assembly 1 to move away from the central axis of the pipe (i.e., radially outward). As the top of the scraper assembly 1 is pulled forward by the front positioning member, and the middle part is radially outward under the action of the first link 9 and the second link 19, the entire scraper assembly 1 gradually changes from a retracted state to an open state until the outer edge of the scraper assembly 1 elastically fits against the inner wall of the circular pipe 15. Conversely, when the inner tube 6 assembly moves axially backward relative to the outer tube 7 assembly, the front positioning member moves backward accordingly, which applies a backward thrust to the top of the scraper assembly 1. The first connecting rod 9 and the second connecting rod 19 rotate in opposite directions, pulling the middle part of the scraper assembly 1 towards the direction closer to the central axis of the pipe (i.e., radially inward), so that the scraper assembly 1 changes from an open state to a closed state, so as to facilitate the removal of the dust removal device from the circular pipe 15 or the movement of it within the circular pipe 15 to the next cleaning position.

[0049] Compared with existing technologies, this invention converts linear motion into radial opening and closing motion of the scraper assembly 1 via a connecting rod assembly through the relative axial movement of the inner tube 6 assembly and the outer tube 7 assembly, thus achieving convenient switching between the retracted and open states of the scraper assembly 1. This purely mechanical transmission method of the present invention eliminates the need for complex hydraulic or electric control systems, reducing the manufacturing cost and maintenance difficulty of the dust removal device.

[0050] It is also important to emphasize that when the scraper assembly 1 is in the retracted state, its overall radial dimension is significantly reduced, allowing it to easily pass through the curved sections and narrow flange connections of the circular pipe 15, facilitating the rapid insertion and removal of the dust removal device into or from the pipe. When the scraper assembly 1 is open, the outer edges of the inner fan-shaped scraper 1.1 and the outer fan-shaped scraper 1.2 can elastically conform to the inner wall of the pipe, ensuring effective scraping of dust 16 during dragging. Furthermore, the coordinated action of multiple linkages in the linkage assembly ensures the synchronicity of the scraper assembly 1 during opening and closing, avoiding blind spots caused by delayed or incomplete movements of individual scrapers, further improving the overall cleaning effect and ease of operation of the dust removal device.

[0051] To better secure the front and rear positioning components, positioning rings are respectively fitted onto the outer tube 7 assembly and the extension section of the inner tube 6 assembly, and positioning pins are evenly distributed along the circumference of the positioning rings; positioning pin holes are correspondingly provided on the front and rear positioning components, and the radial rotation of the front and rear positioning components is restricted by the cooperation between the positioning pins and the positioning pin holes.

[0052] Specifically, a first positioning ring 22 is fitted on one end of the outer tube 7 assembly (outer tube 7) near the working end. The first positioning ring 22 is coaxially arranged with the outer tube 7. Two first positioning pins 24 are evenly distributed around the first positioning ring 22 in the circumferential direction. Two first positioning pin holes 24 are evenly distributed at corresponding positions on the first rear positioning plate 8 and the second rear positioning plate 18. The positions of the first positioning pins 24 and the first positioning pin holes 24 are corresponding and equal in number. The first rear positioning plate 8 and the second rear positioning plate 18 are fixed to the working end of the outer tube 7 assembly (outer tube 7) through their first positioning pin holes 24 and the first positioning pins 24 cooperate with the first positioning pins 24 to restrict their radial rotation. Similarly, a second positioning ring 23 is sleeved on the extension section of the inner tube 6 assembly (inner tube 6). The second positioning ring 23 is coaxially arranged with the inner tube 6, and two second positioning pins 25 are evenly distributed along the circumference of the second positioning ring 23. Two second positioning pin holes 25 are provided at corresponding positions on the first front positioning plate 17 and the second front positioning plate 12. The positions of the second positioning pins 25 and the second positioning pin holes 25 are corresponding and equal in number. The first front positioning plate 17 and the second front positioning plate 12 are fixed to the extension section of the inner tube 6 through their second positioning pin holes 25 and the second positioning pins 25 to restrict its radial rotation.

[0053] It should be noted that the first positioning ring 22 includes a hollow frustum section and a cylindrical section 27, both of which have the same inner diameter and are integrally formed; the two first positioning pins 24 are located in the hollow frustum section, while the first rear positioning disc 8 and the second rear positioning disc 18 are sleeved on the cylindrical section 27 and locked by the first locking nut 14.

[0054] Compared with the prior art, the present invention sets a first positioning pin 24 on the first positioning ring 22, a second positioning pin 25 on the second positioning ring 23, and sets corresponding first positioning pin 24 holes and second positioning pin 25 holes on the front and rear positioning parts. By utilizing the cooperation between the positioning pins and the positioning pin holes, the radial rotation of the front and rear positioning parts during operation can be effectively restricted, thereby enhancing the stability of the installation of the front and rear positioning parts. This avoids unnecessary circumferential rotation of the front and rear positioning parts when the dust removal device moves inside the pipe or when the scraper assembly 1 is under force, thus preventing problems such as scraper misalignment, cleaning dead corners, or collision between the scraper assembly 1 and the inner wall of the pipe caused by the rotation of the positioning parts, and ultimately ensuring the stability of the dust removal operation.

[0055] In order to achieve relative axial movement between the inner tube 6 assembly and the outer tube 7 assembly, the circular pipe 15 cleaning device of the present invention further includes an operating member; the operating member is disposed at the hand-held end of the inner tube 6 assembly and the outer tube 7 assembly, and the operating member cooperates with the inner tube 6 assembly and the outer tube 7 assembly to drive the inner tube 6 assembly to move axially relative to the outer tube 7 assembly.

[0056] The operating components of this invention include an adjusting handle and a limiting screw 3; the adjusting handle is a hollow cylindrical shape and is coaxially sleeved on the outer tube 7 assembly; the end of the adjusting handle away from the hand-held end has an internal thread, the outer tube 7 assembly has an external thread, and the adjusting handle is threadedly connected to the outer tube 7 assembly; the end face of the adjusting handle at the hand-held end has an inner hole, and the end face of the inner tube 6 assembly at the hand-held end has a circular boss that can be embedded in the inner hole, the outer diameter of the circular boss being smaller than the diameter of the inner hole; the outer diameter of the head of the limiting screw 3 is larger than the diameter of the inner hole, forming an axial limit; the connection between the adjusting handle and the inner tube 6 assembly is a clearance fit, and the two can rotate relative to each other.

[0057] Specifically, the aforementioned adjustment handle is threadedly connected to the external thread of the handle end of the outer tube 7 assembly via its internal thread. When the adjustment handle is rotated, it can move axially along the outer tube 7 assembly due to the threaded engagement. Simultaneously, the inner hole on the handle end face is fitted onto the circular boss on the handle end of the inner tube 6 assembly (inner tube 6 or inner connecting tube). Since the outer diameter of the circular boss is smaller than the inner hole diameter, a clearance fit is formed between the adjustment handle and the inner tube 6 assembly, allowing relative rotation between them. The limiting screw 3 passes through the inner hole of the adjustment handle and is fixedly connected to the circular boss of the inner tube 6 assembly. Because the outer diameter of the head of the limiting screw 3 is larger than the inner hole diameter, when the adjustment handle moves axially, the limiting screw 3 can drive the inner tube 6 assembly to move axially synchronously, thereby achieving axial movement of the inner tube 6 assembly relative to the outer tube 7 assembly, thus driving the scraper assembly 1 to complete the switching between closing and opening actions.

[0058] Compared with the prior art, the structural design of the above-mentioned operating component of the present invention can convert the rotational motion of the adjustment handle and the outer tube 7 assembly into the axial linear motion of the inner tube 6 assembly, which is convenient to operate and can accurately control the displacement of the inner tube 6 assembly, ensuring that the opening and closing degree of the scraper assembly 1 meets the actual dust removal requirements.

[0059] On the other hand, a circular pipe 15 dust removal device can be applied to the dust removal of circular exhaust pipes of high-temperature furnaces and low-temperature furnaces in the carbon fiber production process; it is also suitable for the regular cleaning and maintenance of circular cross-section industrial exhaust pipes, the removal of accumulated dust in circular cross-section dust removal system pipes, the cleaning of circular cross-section ventilation pipes, and pipes that are difficult for people to enter or where there is a hazard.

[0060] Furthermore, the present invention also provides a method for cleaning a circular pipe 15, using the aforementioned circular pipe 15 cleaning device, the cleaning method comprising the following steps: Step 1: Send the dust removal device in the retracted state into the exhaust gas pipe from the pipe inlet until the working end of the dust removal device reaches the end of the pipe or the predetermined cleaning position. The operator drives the inner tube 6 assembly to move axially relative to the outer tube 7 assembly through the operating component (adjustment handle), so that the front positioning component and the rear positioning component are at the maximum axial distance; under the action of the connecting rod assembly, the scraper assembly 1 retracts radially, and the overall outer diameter of the dust removal device is at its minimum. At this time, the working end of the device is sent into the interior of the circular pipe 15.

[0061] Step 2: After reaching the predetermined cleaning position, the operator rotates the adjustment handle in the opposite direction to drive the inner tube 6 assembly to move backward relative to the outer tube 7 assembly. At the same time, the connecting rod assembly converts the axial movement of the inner tube 6 assembly into the radial opening movement of the scraper assembly 1. Step 21: The operator rotates the adjustment handle in the opposite direction, moving the adjustment handle axially towards the hand-held end along the outer tube 7 assembly. Step 22: Adjust the movement of the handle to drive the inner tube 6 assembly to move axially backward (towards the handheld end) relative to the outer tube 7 assembly; Step 23: The extension section of the inner tube 6 assembly then drives the front positioning components (first front positioning plate 17 and second front positioning plate 12) to move backward. Step 24: When the front positioning component moves backward, the top of the inner fan-shaped scraper 1.1 hinged to the first front positioning disk 17 and the top of the outer fan-shaped scraper 1.2 hinged to the second front positioning disk 12 are subjected to a backward thrust. At the same time, the middle part of the inner fan-shaped scraper 1.1 is hinged to the rear positioning component (first rear positioning disk 8) fixed on the outer tube 7 assembly through the first connecting rod 9, and the middle part of the outer fan-shaped scraper 1.2 is hinged to the rear positioning component (second rear positioning disk 18) through the second connecting rod 19, and the rear positioning component remains stationary; Step 25: The front positioning member moves backward so that the two ends of the first link 9 and the second link 19 rotate around the hinge point of the rear positioning member and the middle hinge point of the scraper assembly 1, respectively. Step 26: The movement trajectories of the first link 9 and the second link 19 force the middle part of the scraper assembly 1 to move radially outward away from the central axis of the pipe; the backward thrust on the top of the scraper assembly 1 and the radial outward thrust of the middle part work together to make the inner fan-shaped scraper 1.1 and the outer fan-shaped scraper 1.2 gradually open radially from the closed state. It should be noted that in step 26 above, the coordinated action of multiple sets of scrapers, with the inner fan-shaped scraper 1.1 and the outer fan-shaped scraper 1.2 evenly distributed along the circumference, ensures the synchronicity of the opening process.

[0062] Step 27: As the inner tube 6 assembly continues to move backward, the scraper assembly 1 expands outward until the outer edges of the inner fan-shaped scraper 1.1 and the outer fan-shaped scraper 1.2 elastically fit against the inner wall of the circular pipe 15 and form an inward inclination angle of 55°, and the scraper assembly 1 reaches the open state. Step 3: Begin the dust removal process; Keeping the scraper assembly 1 open, the operator drags the cleaning device along the pipe axis from the end of the pipe or the predetermined cleaning position toward the pipe inlet by using the operating part (adjustment handle) or by directly holding the outer pipe 7 assembly.

[0063] It should be noted that, since the inner fan-shaped scraper 1.1 and the outer fan-shaped scraper 1.2 of the present invention are spaced 10-20mm apart axially and staggered circumferentially, they form a stepped double scraper cleaning structure: the inner fan-shaped scraper 1.1, located at the front, first performs a "rough cleaning" of the inner wall of the pipe, scraping off most of the loose or larger pieces of dirt; the outer fan-shaped scraper 1.2, following closely behind, then performs a "fine cleaning" of the remaining area, realizing two stepped cleaning processes. At the same time, the multiple sets of inner fan-shaped scrapers 1.1 and multiple sets of outer fan-shaped scrapers 1.2 are staggered circumferentially, which can completely cover the entire inner circumference of the circular pipe 15, effectively eliminating cleaning dead corners.

[0064] In step 3, during the dragging of scraper assembly 1, the elastic fit between scraper assembly 1 and the inner wall of the pipe ensures the uniformity of scraping force, which not only guarantees the cleaning effect but also avoids damage to the inner wall of the pipe. The scraped-off dust 16 and debris are gradually carried towards the pipe inlet as the dust removal device moves.

[0065] Step 4: After cleaning is completed, reverse the operation to return the inner tube 6 assembly to its original position, retract the scraper assembly 1, reduce the outer diameter of the cleaning device, and finally pull the cleaning device out of the circular pipe 15 to complete the cleaning operation.

[0066] Compared with the prior art, the dust removal method provided by the present invention can effectively and conveniently clean the dust 16 and clumps in long-distance (10-20m) circular exhaust pipes, solving the problems of time-consuming, labor-intensive and incomplete cleaning of traditional methods.

[0067] It needs to be emphasized again that, firstly, the stepped double scraper structure of this invention improves the cleanliness of the cleaning, avoiding the problem of incomplete cleaning found in traditional cleaning structures. Secondly, the invention employs a circumferentially staggered full-coverage design with multiple sets of inner fan-shaped scrapers 1.1 and multiple sets of outer fan-shaped scrapers 1.2, ensuring 360° cleaning of the inner wall of the pipe without dead angles, effectively removing dust 16 from the top, bottom, and sides of the pipe. Furthermore, the elastic fit between the scraper assembly 1 and the inner wall of the pipe, along with the inward tilt angle, makes it difficult for scraped dust 16 to remain inside the pipe, effectively removing it from the cleaning area. Moreover, for long-distance (10-20m) circular exhaust pipes, this invention, through the inner pipe 6 assembly and the outer pipe 7 assembly, can be adjusted according to the actual length of the circular pipe 15, enabling the cleaning device to penetrate deep into the pipe in one go, eliminating the need for frequent pipe disassembly or the use of complex auxiliary equipment, significantly improving cleaning efficiency. After cleaning, all dust 16 on the entire inner wall of the pipe is completely removed.

[0068] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A circular pipe cleaning device, characterized in that, Includes scraper assembly, coaxially sleeved inner tube assembly and outer tube assembly, front positioning component and rear positioning component; The scraper assembly includes at least two sets of radially openable scrapers, each scraper comprising a plurality of inner fan-shaped scrapers and a plurality of outer fan-shaped scrapers; The inner fan-shaped scraper and the outer fan-shaped scraper are spaced 10-20mm apart along the axial direction and staggered along the circumference. The inner fan-shaped scraper and the outer fan-shaped scraper form a stepped double scraper cleaning structure along the axial direction. The inner tube assembly and the outer tube assembly are capable of relative axial movement, and both can adjust their axial length according to the actual length of the circular pipe. Both the front positioning member and the rear positioning member are used to fix the scraper assembly. Through the relative axial movement of the inner tube assembly and the outer tube assembly, the front positioning member and the rear positioning member achieve synchronous relative axial movement. At the same time, the scraper assembly realizes the conversion between the retracted state and the open state. When the scraper assembly is in the retracted state, the dust removal device is sent into the circular exhaust gas duct; the inner tube assembly is driven to move axially relative to the outer tube assembly, causing the scraper assembly to open and the scraper assembly to fit against the inner wall of the circular exhaust gas duct; the dust removal device is dragged, and the dust in the duct is removed by the scraper assembly.

2. The circular pipe cleaning device according to claim 1, characterized in that, One end of the inner tube assembly and the outer tube assembly is a working end, and the other end is a handheld end; at the working end of the inner tube assembly and the outer tube assembly, the working end of the inner tube assembly protrudes forward to form an extension section; the front positioning member is sleeved on the extension section of the inner tube assembly, and the rear positioning member is sleeved on the outer tube assembly.

3. The circular pipe cleaning device according to claim 2, characterized in that, It also includes linkage assemblies; The connecting rod assembly is used to connect the inner tube assembly, the outer tube assembly, and the scraper assembly.

4. The circular pipe cleaning device according to claim 3, characterized in that, It also includes operating components; The operating element is located at the handheld end of the inner tube assembly and the outer tube assembly. The operating element cooperates with the inner tube assembly and the outer tube assembly to drive the inner tube assembly to move axially relative to the outer tube assembly.

5. The circular pipe cleaning device according to claim 4, characterized in that, The rear positioning component includes a hollow annular first rear positioning disk and a second rear positioning disk with the same structure. The first rear positioning disk and the second rear positioning disk are coaxially sleeved on the working end of the outer tube assembly in parallel and adjacent positions. The front positioning component includes a hollow annular first front positioning disk and a second front positioning disk with the same structure. The first front positioning disk and the second front positioning disk are coaxially sleeved on the extension section of the inner tube assembly in parallel and adjacent manner. The first rear positioning plate and the second rear positioning plate are locked together by a first locking nut; the first front positioning plate and the second front positioning plate are locked together by a second locking nut.

6. The circular pipe cleaning device according to claim 5, characterized in that, The linkage assembly includes multiple sets of first linkages, second linkages, first connecting pins, second connecting pins, first cotter pins, and second cotter pins.

7. The circular pipe cleaning device according to claim 6, characterized in that, The inner fan-shaped scraper and the outer fan-shaped scraper each have hinge points at their top and middle parts; The middle part of the inner fan-shaped scraper is hinged to the first connecting rod by the first connecting pin, and its top end is hinged to the first front positioning plate by the first connecting pin; the middle part of the outer fan-shaped scraper is hinged to the second connecting rod by the second connecting pin, and its top end is hinged to the second front positioning plate by the second connecting pin. The first connecting pin is fixed by the first cotter pin, and the second connecting pin is fixed by the second cotter pin.

8. The circular pipe cleaning device according to claim 7, characterized in that, Positioning rings are respectively fitted on the outer tube assembly and the extension section of the inner tube assembly, and positioning pins are evenly distributed around the circumference of the positioning rings; positioning pin holes are correspondingly provided on the front positioning member and the rear positioning member, and the radial rotation of the front positioning member and the rear positioning member is restricted by the cooperation between the positioning pins and the positioning pin holes.

9. The circular pipe cleaning device according to any one of claims 1 to 8, characterized in that, The operating components include an adjustment handle and a limit screw; The adjustment handle is a hollow cylindrical shape and is coaxially sleeved on the outer tube assembly; the end of the adjustment handle away from the hand-held end is provided with an internal thread, the outer tube assembly is provided with an external thread, and the adjustment handle is threadedly connected to the outer tube assembly. The adjustment handle has an inner hole on its end face at the handheld end, and the inner tube assembly has a circular boss on its end face at the handheld end. The circular boss can be embedded in the inner hole, and the outer diameter of the circular boss is smaller than the diameter of the inner hole. The outer diameter of the head of the limiting screw is larger than the diameter of the inner hole, forming an axial limit. The connection between the adjustment handle and the inner tube assembly is a clearance fit, and the two can rotate relative to each other.

10. A method for cleaning ash from a circular pipe, characterized in that, The circular pipe cleaning device according to any one of claims 1 to 9 is used for cleaning.

Images