A pipe cleaning device

Abstract

The present invention discloses a pipe cleaning device, including a suction pipe, an air supply pipe, a fixed cylinder and a rotor assembly; the air supply pipe is arranged in the suction pipe, and one end of the fixed cylinder is connected to one end of the suction pipe; it is provided with a hollow interlayer, and the interlayer is connected to the suction pipe near one end of the suction pipe, and an air passage is arranged on the inner wall of the fixed cylinder to connect the interlayer, and a suction passage is opened on the outer wall of the fixed cylinder; the rotor assembly includes a rotating drum and a plurality of blades installed on the outer wall of one end of the rotating drum, the end of the rotating drum near the blade is closed, and the other end is rotatably connected to the air supply pipe; the rotating drum is rotatably inserted in the fixed cylinder; the rotating drum is provided with a flow hole that matches and is connected to the air passage; the inner wall of the rotating drum is spirally provided with a guide plate or a fan blade. The pipe cleaning device can effectively remove the sediment on the inner wall of the pipeline, and take these detached sediments outward, reducing the problem of sediment accumulation during the cleaning process and causing the cleaning effect to decrease.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline cleaning equipment, and in particular to a pipeline cleaning device. Background Art

[0002] At present, long-distance and large-diameter pipelines are increasingly used in production facilities, such as water pipelines, oil and gas pipelines, power plant ash pipelines, gas pipelines, and slurry pipelines in mines. After these pipelines have been in operation for a period of time, the components of the conveying medium and other impurities will continue to deposit on the inner wall of the pipeline. As time goes by, the scale on the inner wall of the pipeline will become thicker and thicker, which will greatly reduce the conveying flow of the pipeline, which will not only affect normal production, but also cause the pipeline wall to be corroded and leak in severe cases. Therefore, the pipeline needs to be cleaned regularly during use.

[0003] The current cleaning method generally uses a leather cup with a diameter slightly larger than the pipe diameter to be inserted into one end of the pipe to be cleaned, and then passes a high-pressure fluid into it. The top pressure of the high-pressure fluid is used to push the leather cup to scrape the sediment in the pipe to be cleaned, until the leather cup pushes all the sediment out of the other end of the pipe to be cleaned. Using this method to clean the pipe causes the sediment in the pipe to gradually increase and accumulate, thereby increasing the travel resistance of the leather cup. At this time, the pressure of the high-pressure fluid has to be increased, otherwise it will be difficult to continue to push the leather cup to clean the pipe. In addition, for some stubborn sediment blocks, the leather cup is difficult to clean, and the leather cup will deform when passing through these stubborn sediments, which can easily cause the sediment that has been cleaned in the forward direction of the leather cup to remain near the stubborn sediment blocks, directly affecting the cleaning effect. Based on the above problems, some manufacturers on the market have designed some special pipe cleaning tools. For example, CN201420729166.2-New pipeline cleaning nozzle uses high-pressure fluid to drive the tool to rotate and then uses the tool to scrape the stubborn sediment blocks and sediments on the inner wall of the pipeline, so that the sediments in the entire pipeline to be cleaned are all loose and fall off from the inner wall of the pipeline. However, after cleaning in this way, it is necessary to continue to use the leather cup to push out the fallen sediments, which is very troublesome. In addition, when cleaning in this way, the fallen sediments will pile up more and more. Since the fallen sediments cannot be removed, these sediments will hinder the normal operation of the cleaning tool. Summary of the invention

[0004] The present invention aims to solve at least one of the above-mentioned technical problems and provide a pipe cleaning device that can effectively remove sediments on the inner wall of the pipe and carry these detached sediments outward, thereby reducing the problem of sediment accumulation during the cleaning process and resulting in a decrease in the cleaning effect.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] The cam is connected with the air intake pipe by the air intake outlet, and the air intake outlet is connected with the air intake pipe by the air intake outlet.

[0007] As an improvement of the above technical solution, the fixed cylinder includes an inner cylinder and an outer cylinder arranged coaxially, and the ends of the inner cylinder and the outer cylinder away from the suction pipe are connected by a sealing ring to form the interlayer; the suction pipe is sleeved on the outer wall of the end of the outer cylinder away from the sealing ring, the suction channel is arranged on the outer cylinder, and the air passage is arranged on the inner cylinder and on the front side of the suction channel; the rotating cylinder is rotatably inserted in the inner cylinder.

[0008] As an improvement of the above technical solution, the suction channel is arranged in an annular shape on the side wall of the outer cylinder, and the outer cylinder is connected to the two side parts of the suction channel through a connecting column. The suction channel is inclined with a groove on the side of the outer cylinder in the forward direction, and the groove smoothly transitions with the outer wall of the outer cylinder. The side of the suction channel located at the rear of the outer cylinder gradually bulges outward to form a scraper ring, and the scraper ring can be deformed.

[0009] As an improvement of the above technical solution, an annular ring platform is arranged inwardly of the inner cylinder, and one end of the air passage connected to the flow hole is arranged on the side of the ring platform pointing to the axial side of the inner cylinder; the rotating cylinder is movably inserted on the ring platform, and the rotating cylinder is located on both sides of the ring platform and is installed on the inner cylinder through rotating bearings; a locking nut is arranged at the end of the rotating cylinder away from the blade, and the locking nut locks the inner ring of the rotating bearing on the corresponding side.

[0010] As an improvement of the above technical solution, the middle part of the ring platform is inwardly recessed to form an annular groove, the port of the gas passage is arranged in the annular groove, and the annular groove is directly opposite to the port of the flow hole.

[0011] As an improvement of the above technical solution, sealing members are provided on both sides of the annular groove of the annular platform, and the sealing members are pressed against the outer wall of the rotating drum.

[0012] As an improvement of the above technical solution, the rotating cylinder includes a rotating part and an end head, the rotating part is rotatably installed in the fixed cylinder, the end of the end head facing outward is closed, and the other end is connected to the rotating part; the end of the rotating part away from the end head is rotatably connected to the air supply pipe, the flow hole is arranged on the rotating part, and the side of the end head close to the rotating part gradually extends outward and forms a cone, and the cone is movably mounted outside the fixed cylinder; the blades are evenly arranged on the outer wall of the cone.

[0013] As an improvement of the above technical solution, a plurality of through holes are provided on the outer wall of the end portion in the corresponding area where the blade is located, and the aperture of the through holes is smaller than the aperture of the flow hole.

[0014] As an improvement of the above technical solution, a closing mechanism is provided on the outside of the fixed cylinder, and the closing mechanism can close the suction channel.

[0015] As an improvement of the above technical solution, the sealing mechanism includes a blocking cylinder and a telescopic motor. The blocking cylinder is mounted outside the fixed cylinder. The telescopic motor is installed on the outer wall of the fixed cylinder. The output end of the telescopic motor is connected to the fixed cylinder. The telescopic motor can drive the blocking cylinder to slide outside the fixed cylinder to block or open the suction channel.

[0016] Compared with the prior art, the beneficial effects of this application are:

[0017] The pipe cleaning device of the present invention utilizes a suction pipe and an air supply pipe to form a casing; the air supply pipe is used to provide a high-pressure airflow to the rotating drum. When the high-pressure airflow flows in the rotating drum, the rotating drum is rotated in the fixed cylinder body through the force exerted on the guide plate or the fan blade, thereby driving the blade to cut the sediment in the forward direction, and the sediment blocks can be effectively removed; the high-pressure airflow of the air supply pipe can be effectively utilized by the cooperation of the air passage and the flow hole, so that this part of the high-pressure airflow enters the interlayer and is discharged to the outside through the suction pipe; on this basis, the negative pressure formed by this part of the high-pressure airflow is utilized to micro-suck the broken and detached sediment into the suction pipe through the suction channel, thereby realizing the removal of the sediment, and avoiding the sediment accumulation in front of the pipe cleaning device and affecting the pipe cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein:

[0019] Figure 1 The structure of the embodiment of the present invention is shown in FIG. Figure 1 ;

[0020] Figure 2 The structure of the embodiment of the present invention is shown in FIG. Figure 2 ;

[0021] Figure 3is a cross-sectional view of an embodiment of the present invention;

[0022] Figure 4 It is a structural schematic diagram of a fixed cylinder in an embodiment of the present invention;

[0023] Figure 5 It is a structural schematic diagram of a rotor assembly in an embodiment of the present invention;

[0024] Figure 6 It is a structural schematic diagram of another embodiment of the present invention in which a sealing mechanism is additionally installed.

[0025] In the figure: suction pipe 1, air supply pipe 2, fixed cylinder 3, interlayer 31, air passage 32, suction passage 33, groove 331, scraper ring 332, inner cylinder 34, outer cylinder 35, blocking ring 36, connecting column 37, ring platform 38, ring groove 39, rotor assembly 4, rotating cylinder 41, rotating part 411, end part 412, cone cylinder 413, through hole 414, blade 42, flow hole 43, guide plate 44, locking nut 45, rotating bearing 5, closing mechanism 6, blocking cylinder 61, telescopic motor 62 DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is referred to as being "set in the middle", it does not only mean being set in the middle, as long as it is not set at both ends within the range defined by the middle. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0029] like Figures 1 to 5 As shown, the present invention provides a pipe cleaning device, including a suction pipe 1, an air supply pipe 2, a fixed cylinder 3 and a rotary head assembly 4. In the present application, the forward direction of the pipe cleaning device is defined as the front, and the end where the suction pipe 1 and the air supply pipe 2 are located is relatively the rear, which is convenient for describing the specific structure of the present application. Among them, the air supply pipe 2 is movably inserted in the suction pipe 1, and one end of the fixed cylinder 3 is rotatably inserted on one end of the suction pipe 1; it is provided with a hollow interlayer 31, and the end of the interlayer 31 close to the suction pipe 1 is connected with the suction pipe 1, and the inner wall of the fixed cylinder 3 is provided with an air passage 32, and the air passage 32 is connected with the interlayer 31, and the outer wall of the fixed cylinder 3 is provided with a suction channel 33, and the suction channel 33 is located behind the air passage 32; the rotary head assembly 4 includes a rotating cylinder 41 And a plurality of blades 42 are installed on the outer wall of one end of the rotating drum 41, the end of the rotating drum 41 close to the blades 42 is closed, and the other end is rotatably connected to the air supply pipe 2; the rotating drum 41 is rotatably inserted into the fixed cylinder 3; the rotating drum 41 is provided with a flow hole 43 that matches and communicates with the air passage 32; the inner wall of the rotating drum 41 is spirally provided with a guide plate 44 or a fan blade along the direction of its rotation axis, and the guide plate 44 is located between the flow hole 43 and the open end of the rotating drum 41. In the present application, the maximum outer edge of the rotary cut surface formed by the blade 42 after rotation can be the same as the outer diameter of the fixed cylinder 3, so as to prevent the blade 42 from hitting the inner wall of the pipeline to be cleaned during the rotation process. The blades 42 are arranged in several groups and form several rotary cutting surfaces, that is, several groups of rotary cutting surfaces are arranged, and several groups of blades 42 are arranged on each rotary cutting surface, wherein the diameter of the rotary cutting surface gradually decreases along the forward direction, that is, the length of the blades 42 on each rotary cutting surface gradually decreases along the forward direction; such a design facilitates the entire cleaning device to remove the sediment blocks layer by layer, and avoids the situation in which the blades 42 feed too much during rotary cutting and cause the sediment blocks to jam the blade.

[0030] It should be noted that in the present application, some sliding wheel structures can also be designed on the outer wall of the fixed cylinder 3 along the circumferential direction, and the sliding wheel is used to keep the entire fixed cylinder 3 in a coaxial position relative to the pipeline to be cleaned. Of course, in practice, the outer diameter of the fixed cylinder 3 can be made the same as the inner diameter of the pipeline to be determined, so that the present cleaning device can be directly inserted into the pipeline to be cleaned for cleaning. In addition, the structural design of the guide plate 44 or the fan blade is mainly to utilize the high-speed airflow blown out by the air supply pipe 2 to push the guide plate 44 or the fan blade to generate a driving force around the circumferential direction of the rotating drum 41 when passing through the guide plate 44 or the fan blade, so that the rotating drum 41 is rotated around its own axis, and then the blade 42 is driven to rotate and peel the sediment.

[0031] The pipe cleaning device of the present invention uses a suction pipe 1 and an air supply pipe 2 to form a sleeve; the air supply pipe 2 is used to provide a high-pressure airflow to the rotating drum 41. When the high-pressure airflow flows in the rotating drum 41, the rotating drum 41 is rotated in the fixed cylinder 3 through the force exerted on the guide plate 44 or the fan blade, thereby driving the blade 42 to cut the sediment in the forward direction, which can effectively remove the sediment blocks; the high-pressure airflow of the air supply pipe 2 can be effectively utilized by the cooperation of the air passage 32 and the flow hole 43, so that this part of the high-pressure airflow enters the interlayer 31 and is discharged outward through the suction pipe 1; on this basis, the negative pressure formed by this part of the high-pressure airflow is used to micro-suck the broken and detached sediment into the suction pipe 1 through the suction channel 33, thereby realizing the removal of the sediment, avoiding the sediment from accumulating in front of the pipe cleaning device and affecting the pipe cleaning effect.

[0032] See 1 to Figure 5 The fixed cylinder 3 includes an inner cylinder 34 and an outer cylinder 35 arranged coaxially, and the inner cylinder 34 and the outer cylinder 35 are connected at one end away from the suction pipe 1 through a blocking ring 36 to form the interlayer 31; the suction pipe 1 is sleeved on the outer wall of the end of the outer cylinder 35 away from the blocking ring 36, the suction channel 33 is arranged on the outer cylinder 35, and the air passage 32 is arranged on the inner cylinder 34 and arranged on the front side of the suction channel 33; the rotating cylinder 41 is rotatably inserted in the inner cylinder 34. In actual use, in order to make the rotating cylinder 41 rotate better relative to the inner cylinder 34, a bearing structure can be installed between the two. In this application, the inner cylinder 34 and the outer cylinder 35 can be supported and connected by some rod-like structures to maintain the strength of the entire fixed cylinder 3. In order to reduce the sedimentation and clogging in the interlayer 31, the thickness of the interlayer 31 can be appropriately increased, and the ratio of its thickness to the diameter of the air supply pipe 2 is more than 2:1. The suction channel 33 in the present application may be a hole-groove structure, the main purpose of which is to utilize the high-speed airflow passing through the interlayer 31 to drive the suction of the fallen sediments.

[0033] See also Figure 3 and Figure 4In one embodiment of the present application, the suction channel 33 is annularly arranged on the side wall of the outer tube 35, and the outer tube 35 is connected to the two side parts of the suction channel 33 by a connecting column 37. The suction channel 33 is located on the side of the outer tube 35 in the forward direction and is obliquely provided with a groove 331, and the groove 331 smoothly transitions with the outer wall of the outer tube 35. The structural design of the groove 331 makes the entire suction channel 33 trumpet-shaped, which can not only collect sediments well but also avoid the opening of the suction channel 33 being too large, thereby reducing the suction force caused by the high-speed airflow therein. In addition, the side of the suction channel 33 located behind the outer tube 35 gradually bulges outward and forms a scraper ring 332, and the scraper ring 332 can be deformed. It should be noted that in the present application, the structure of the scraper ring 332 is similar to the leather cup structure used in conventional pipe cleaning. The main purpose of designing the scraper ring 332 is to block the pipeline to be cleaned and prevent the cleaned sediment from being discharged in front and behind when the entire cleaning device moves forward. The scraper ring 332 is used to locate the position of the entire cleaning device in the pipeline to be cleaned, which is convenient for the rotating head assembly 4; more importantly, the scraper ring 332 in the present application plays a role in isolating the pipeline to be cleaned, so that the sediment after falling off is pushed by the scraper ring 332, and at the same time collected into a pile by the scraper ring 332, which is convenient for suction by the suction channel 33.

[0034] See also Figure 3 and Figure 5In order to facilitate the installation of the rotating drum 41, the inner drum 34 is provided with an annular ring platform 38 inwardly, and the end of the gas passage 32 connected to the flow hole 43 is provided on the side of the ring platform 38 pointing to the axial side of the inner drum 34; the rotating drum 41 is movably inserted on the ring platform 38, and the rotating drum 41 is located on both sides of the ring platform 38 and is installed on the inner drum 34 through the rotating bearing 5; the end of the rotating drum 41 away from the blade 42 is provided with a locking nut 45, and the locking nut 45 locks the inner ring of the rotating bearing 5 on the corresponding side. In this application, in order to increase the actual use effect, the ring platform 38 and the rotating drum 41 are clearance-matched, which is convenient for installation and reduces the mutual wear between the ring platform 38 and the rotating drum 41 during use. If clearance fit is adopted, in order to ensure the sealing between the flow hole 43 and the gas passage 32, in one embodiment of the present application, the middle part of the ring platform 38 is recessed inwardly to be provided with an annular groove 39, and the port of the gas passage 32 is arranged in the annular groove 39, and the annular groove 39 is directly opposite to the port of the flow hole 43. The ring platform 38 is provided with sealing members 3a on both sides of the annular groove 39, and the sealing members 3a are pressed against the outer wall of the rotating drum 41. The use of the sealing members 3a can effectively ensure the stable connection between the flow hole 43 on the outer wall of the rotating drum 41 and the gas passage 32. At the same time, the design of the annular groove 39 is convenient for the high-speed airflow ejected from the flow hole 43 to be always received by the annular groove 39 when the rotating drum 41 rotates, and passes into the gas passage 32, and finally enters the interlayer 31. In addition, in order to increase the flow capacity of the airflow, the gas passage 32 in the present application is a slot structure, and is opened on the bottom or side wall of the annular groove 39. In actual use, the flow hole 43 is also designed in this way, and the purpose is to reduce the actual flow resistance of the fluid.

[0035] See also Figure 3 and Figure 5In the present application, the rotating drum 41 can have a variety of structures, one of which is as follows. The rotating drum 41 includes a rotating part 411 and an end head 412, the rotating part 411 is rotatably installed in the fixed cylinder 3, the end head 412 is closed at one end facing outward, and the other end is connected to the rotating part 411; the end of the rotating part 411 away from the end head 412 is rotatably connected to the air supply pipe 2, the flow hole 43 is arranged on the rotating part 411, the side of the end head 412 close to the rotating part 411 gradually extends outwardly and forms a cone 413, and the cone 413 is movably mounted outside the fixed cylinder 3; the blades 42 are evenly arranged on the outer wall of the cone 413, and of course the blades 42 can also be arranged on the outer wall of the end head 412. Among them, the structural design of the cone 413 is similar to a protective cone sleeve, which can effectively prevent the sediments that are knocked down or cleaned from entering between the ring platform 38 and the rotating drum 41 when the entire cleaning device is cleaning the pipe, thereby avoiding the sediments from affecting the rotation between the ring platform 38 and the rotating drum 41. In addition, the structure of the cone 413 can also better protect the fixed cylinder 3, and its structure with the fixed cylinder 3 and the rotating head assembly 4 forms a round-shaped structure, making it difficult for external sediments to enter between the fixed cylinder 3 and the rotating head assembly 4. Of course, in actual use, a sealing ring structure can also be set between the outer wall of the outer cylinder 35 and the inner wall of the cone 413, so that the outer cylinder 35 and the cone 413 can achieve rotational sealing, thereby improving the protection. It should be noted that in the present application, the diameter of the front end of the head 412 in the forward direction gradually increases toward the rear, and the diameter of the cone 413 area is greater than the diameter of the outer cylinder 35, but the diameters of the front and rear ends of the cone 413 remain consistent. Specifically, the end portion 412 is a cone head structure, and the area where the cone tube 413 cooperates with the outer tube 35 is a cylindrical structure.

[0036] In addition, in one embodiment of the present application, the outer wall of the end portion 412 is provided with a plurality of through holes 414 in the corresponding area where the blade 42 is located, and the aperture of the through hole 414 is smaller than the aperture of the flow hole 43. The purpose of adopting such a design is that when the blade 42 rotates, the airflow ejected from the through hole 414 can effectively blow away the sediment adhered to the blade 42, and at the same time, the airflow can be used to blow away the sediment that has been scattered in the cleaning pipeline, so that the blade 42 can clean the sediment block.

[0037] See also Figure 6In actual use, there is a situation where it is not necessary to suck out the sediment. For this reason, in one embodiment of the present application, a closing mechanism 6 is provided on the outside of the fixed cylinder 3, and the closing mechanism 6 can close the suction channel 33. The structural design of the closing mechanism 6 makes the entire cleaning device a simple rotating head structure, which can use its own rotation to drive the blade 42 to peel off the sediment in the pipeline to be cleaned. In actual use, since the sediment is not continuous, in order to enhance the peeling force of the blade 42, the closing mechanism 6 can be opened at a distance to achieve suction of the sediment knocked down.

[0038] The sealing mechanism 6 includes a blocking cylinder 61 and a telescopic motor 62. The blocking cylinder 61 is sleeved outside the fixed cylinder 3. The telescopic motor 62 is installed on the outer wall of the fixed cylinder 3. The output end of the telescopic motor 62 is connected to the fixed cylinder. The telescopic motor 62 can drive the blocking cylinder 61 to slide outside the fixed cylinder 3 to block or open the suction channel 33. In addition, in order to better protect the telescopic motor 62, the telescopic motor 62 is installed on the back of the scraper ring 332. The output end of the telescopic motor 62 is movably connected to the fixed cylinder through the scraper ring 332; the scraper ring 332 is used to prevent sediment from affecting the normal operation of the telescopic motor 62.

[0039] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Any modification or equivalent substitution that does not depart from the spirit and scope of the present invention shall be included in the scope of the technical solution of the present invention.

Claims

1. A pipe cleaning device, characterized in that: include Suction tube; An air supply pipe is movably inserted in the suction pipe and contains pressurized air; A fixed cylinder, one end of which is rotatably inserted on one end of the suction pipe; It is provided with a hollow interlayer, one end of the interlayer close to the suction pipe is connected with the suction pipe, an air passage is provided on the inner wall of the fixed cylinder, the air passage is connected with the interlayer, and a suction passage is opened on the outer wall of the fixed cylinder, and the suction passage is located behind the air passage; the fixed cylinder comprises an inner cylinder and an outer cylinder arranged coaxially, and the inner cylinder and the outer cylinder are connected by a blocking ring at one end away from the suction pipe to form the interlayer; the suction pipe is sleeved on the outer wall of the end of the outer cylinder away from the blocking ring, the suction passage is arranged on the outer cylinder, and the air passage is arranged on the inner cylinder and at the front side of the suction passage; the rotating cylinder can be rotatably inserted in the inner cylinder; and The rotor assembly comprises a rotor and a plurality of blades mounted on the outer wall of one end of the rotor, wherein one end of the rotor close to the blades is closed and the other end is rotatably connected to the air supply pipe; the rotor is rotatably inserted in the fixed cylinder; the rotor is provided with a flow hole that matches and communicates with the air passage; the inner wall of the rotor is spirally provided with a guide plate or a fan blade along the direction of the rotation axis, and the guide plate is located between the flow hole and one end of the rotor opening; Wherein, a closing mechanism is arranged on the outside of the fixed cylinder, and the closing mechanism can close the suction channel.

2. A pipe cleaning device according to claim 1, characterized in that: The suction channel is annularly arranged on the side wall of the outer cylinder, and the outer cylinder is connected to the two side parts of the suction channel through a connecting column. The suction channel is inclined with a groove on the side of the outer cylinder in the forward direction, and the groove smoothly transitions to the outer wall of the outer cylinder. The side of the suction channel located at the rear of the outer cylinder gradually bulges outward to form a scraper ring, and the scraper ring can be deformed.

3. A pipe cleaning device according to claim 1, characterized in that: An annular ring platform is arranged inwardly of the inner cylinder, and one end of the air passage connected to the flow hole is arranged on the side of the ring platform pointing to the axial side of the inner cylinder; the rotating cylinder is movably inserted on the ring platform, and the rotating cylinder is located on both sides of the ring platform and is installed on the inner cylinder through rotating bearings; a locking nut is arranged at the end of the rotating cylinder away from the blade, and the locking nut locks the inner ring of the rotating bearing on the corresponding side.

4. A pipe cleaning device according to claim 3, characterized in that: The middle part of the ring platform is inwardly recessed to form an annular groove, the port of the gas passage is arranged in the annular groove, and the annular groove faces the port of the flow hole.

5. A pipe cleaning device according to claim 4, characterized in that: The ring platform is provided with sealing members on both sides of the ring groove, and the sealing members are pressed against the outer wall of the rotating drum.

6. A pipe cleaning device according to any one of claims 1 to 5, characterized in that: The rotating cylinder includes a rotating part and an end portion, the rotating part is rotatably installed in a fixed cylinder, the end of the end portion facing outward is closed, and the other end is connected to the rotating part; the end of the rotating part away from the end portion is rotatably connected to the air supply pipe, the flow hole is arranged on the rotating part, and the side of the end portion close to the rotating part gradually extends outwardly and forms a cone, and the cone is movably mounted outside the fixed cylinder; the blades are evenly arranged on the outer wall of the cone.

7. A pipe cleaning device according to claim 6, characterized in that: The outer wall of the end portion is provided with a plurality of through holes in the corresponding area where the blade is located, and the aperture of the through holes is smaller than the aperture of the flow hole.

8. A pipe cleaning device according to claim 1, characterized in that: The sealing mechanism includes a blocking cylinder and a telescopic motor. The blocking cylinder is mounted outside the fixed cylinder. The telescopic motor is installed on the outer wall of the fixed cylinder. The output end of the telescopic motor is connected to the fixed cylinder. The telescopic motor can drive the blocking cylinder to slide outside the fixed cylinder to block or open the suction channel.

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