Artificial tornado dagger composite type multi-stage pipe cleaning device without grooves and its pipe cleaning method

Abstract

The present invention provides an artificial tornado dagger composite type groove-free multi-stage pipe cleaning device and its pipe cleaning method, which includes a connected first-stage pipe cleaning device and a second-stage pipe cleaning device. A plurality of suction joint pipes are uniformly distributed in the circumferential direction of the outer wall surface of the pipe cleaning device. The suction joint pipes are connected to an air compressor, and nozzles are connected to each blowing joint. The first-stage pipe cleaning device is connected to a vibrating screen and further includes a dirt discharge device at the rear end. Compressed air is transported into the cavity of the pipe cleaning device, entraining sand and gravel particles to form a first-stage gas-solid mixed flow, which is sent into the second-stage pipe cleaning device. A plurality of high-speed airflows incident obliquely and tangentially into the cavity of the second-stage pipe cleaning device body can form an artificial tornado, making the movement trajectory of the gas-solid mixed flow spiral and moving forward to contact the inner wall surface of the workpiece to be cleaned, thereby forming a second-stage gas-solid mixed flow. In this process, the sand and gravel particles continuously scratch and collide with the inner wall surface of the workpiece to be cleaned, thereby achieving the expected groove-free and water-free efficient pipe cleaning effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of internal cleaning of existing underground pipes (culverts) and drill strings, and specifically relates to an artificial tornado dagger composite type multi-stage pipe cleaning device without grooves and a pipe cleaning method thereof.

Background Art

[0002] There is no doubt that at a certain depth underground in the city, various pipes (culverts) such as water supply / sewage discharge / thermal energy / electric power / oil and gas are laid crisscross like the blood vessel network of the human body. They are the lifelines of the underground infrastructure essential for maintaining the normal activities of the city, and are responsible for transmitting substances, resources, and information such as water supply, drainage, thermal energy, electric power, fuel gas, oil, and communication day and night. Therefore, the quality of their performance directly affects the quality of life of urban residents and the normal activities of agriculture and industry. However, when these pipes (culverts) are used for a certain period, it is inevitable that a lot of dirt will remain on the pipe walls and inside the pipes. If they are not cleaned promptly, the effective flow channel cross-section of the pipes (culverts) will inevitably decrease, affecting the normal transportation of fluids necessary for life / production, contaminating the transported fluids, degrading the quality of people's life / agricultural and industrial production, accelerating the corrosion, damage / failure of the pipes (culverts) themselves, and causing many unnecessary losses. Therefore, the underground pipes (culverts) in cities with a long service life need to be cleaned in a timely manner. When the size of the pipes (culverts) is large, professional personnel can be dispatched to enter the pipes (culverts) for manual cleaning. However, when the size of the pipes (culverts) is small and personnel cannot enter, it is necessary to use an appropriate trenchless unmanned pipe cleaning method. Currently, the commonly used trenchless unmanned pipe cleaning methods mainly include pipe cleaning by high-pressure water jet of self-propelled nozzles, pipe cleaning by hydraulic pulse vibration, pipe cleaning by scratching with a rubber pipe cleaning device, pipe cleaning by excavation of a pipe robot, pipe cleaning by chemical cleaning agents, etc. These methods can achieve trenchless cleaning of underground pipes (culverts). However, during the implementation of pipe cleaning, there are many problems such as a lot of waste of water resources, difficulty in quickly discharging the sewage after pipe cleaning, hindrance to the movement of the pipe cleaning device or pipe robot in the pipes (culverts), incomplete cleaning of the pipe walls, low pipe cleaning efficiency, and high toxicity of chemical cleaning agents.

[0003] In addition, the drill string mainly consists of a kelly, a special joint, drill rods, drill collars, etc., as a combination of drills that connect a surface excavation device (drill unit / slurry pump / pneumatic compressor, etc.) to an underground drilling machine (drill bit / grinding head, etc.) or a bottom hole drive device (screw drill / turbo drill, etc.). Its basic functions include raising and lowering the drill bit, applying drilling pressure, transmitting power, transporting the cleaning fluid, and performing special operations in the well (dealing with downhole troubles), etc. It is one of the essential and important components for the excavation work. However, every time the excavation work is completed, residues of the cleaning fluid such as slurry adhere to both the inner and outer wall surfaces of the drill string. If not removed promptly, problems such as corrosion of the drill string, blockage of the flow path cross-section inside the drill string, and eventually rupture / damage are likely to occur. Currently, it is easy to remove the residues adhering to the outer wall surface of the drill string. However, due to the limitation of the inner diameter size of the drill string, it is not easy to remove the residues adhering to the inner wall surface of the drill string. The commonly used method for removing the residues adhering to the inner wall surface of the drill string is the same as the aforementioned non-grooved unmanned pipe cleaning method, and the problems to be solved are basically the same.

Summary of the Invention

Problems to be Solved by the Invention

[0004] In view of the above technical problems, based on the formation principle of tornadoes, the present invention utilizes a special internal flow path structure of a pipe cleaning device to generate artificial tornadoes, and sucks in crushed sand with poor roundness and having edges and corners, and moves spirally from one end to the other along the inner wall of a workpiece abbreviated as the cleaning target, like a sharp dagger (a sharp short knife). The crushed sand can be purchased ready-made from a building materials market, or can be produced by using a rock crusher to crush large stones or construction solid waste such as waste (asphalt) concrete blocks, crushed stone blocks, and brick fragments generated during the process of new construction, renovation / extension or demolition to the required size on site, realizing the reuse of construction solid waste. In this process, since the artificial tornado moves simultaneously in the tangential direction and the vertical direction, it can continuously suck in and entrain the crushed sand fed downward from a vibrating screen, causing a spiral and forward movement along the wall. The scratching and collision between the crushed sand and the inner wall surface of the workpiece to be cleaned contribute to the removal of dirt adhering to the pipe wall, and the strong suction force of the artificial tornado contributes to quickly removing the dirt that has fallen from the inner wall of the pipe (culvert) / drill string and accumulated in the pipe (culvert) / drill string. Thereby, efficient cleaning of existing underground pipes (culverts) or drill strings without trenches and without water is realized.

Means for Solving the Problems

[0005] The specific technical solutions are as follows. An artificial tornado dagger composite type trenchless multi-stage pipe cleaning device, including a pipe cleaning device at the front end, wherein the pipe cleaning device includes a first-stage pipe cleaning device and a second-stage pipe cleaning device. The first-stage pipe cleaning device includes a first-stage right-end flange, a first-stage pipe cleaning device main body, and a first-stage left-end flange connected in sequence. A plurality of first-stage suction joint pipes are uniformly distributed in the circumferential direction of the outer wall surface of the first-stage pipe cleaning device. The axis of the first-stage suction joint pipe and the axis of the cavity of the first-stage pipe cleaning device main body are obliquely intersecting in the same plane. The second-stage pipe cleaning device includes a second-stage right-end flange, a second-stage pipe cleaning device main body, and a second-stage left-end flange that are connected in sequence. A plurality of second-stage suction joint pipes are uniformly distributed in the circumferential direction of the outer wall surface of the second-stage pipe cleaning device. The axis of the second-stage suction joint pipe is inclined and in contact with the wall surface of the cavity of the second-stage pipe cleaning device main body. The second-stage right-end flange is connected to the first-stage left-end flange, whereby the first-stage pipe cleaning device and the second-stage pipe cleaning device are hermetically connected. The first-stage suction joint pipe and the second-stage suction joint pipe are each hermetically connected to the blowing joint of a multi-channel switching valve. The multi-channel switching valve further includes a suction joint and a hollow multi-channel switching valve main body. The suction joint is connected to an air compressor. A nozzle having an internal flow path with a contracting cross-section is connected to each blowing joint. A shut-off valve for adjusting the opening and closing of the air flow of compressed air and the magnitude of the flow rate is provided on the blowing joint. The first-stage right-end flange of the first-stage pipe cleaning device is fixedly connected to the inlet flange of the supply pipe, and the supply pipe is connected to the discharge port of the vibrating screen. The first-stage suction joint pipe and the second-stage suction joint pipe are adjustable joint pipes. The adjustable joint pipe includes a rigid sleeve and further includes a connecting rod type angle changing mechanism. The connecting rod type angle changing mechanism includes an S-shaped guide rail, a guide screw, an adjusting nut, and a telescopic guide rod. S-shaped guide rails are uniformly distributed at intervals on the outer wall surfaces of the first-stage pipe cleaning device and the second-stage pipe cleaning device. A guide groove is provided in the S-shaped guide rail. A slider fitted in the guide groove is provided at the bottom end of the guide screw. The guide screw is slidable in an S shape along the guide groove. A plurality of position regulating holes are provided at intervals on the upper surface of the guide groove. A position regulating base with threaded holes on both sides is provided below the guide screw. After the guide screw slides to an appropriate position, the position regulating base and the position regulating holes are fixedly connected through screws to realize the fixation of the guide screw. The screw body thread of the guide screw is screwed with the adjusting nut. The adjusting nut is fixed to one end of the telescopic guide rod, and tightening nuts are provided on both the upper and lower sides of the adjusting nut. The other end of the telescopic guide rod is hinged to a rigid sleeve, the rigid sleeve is coaxially fitted and connected to a flexible corrugated pipe, and the flexible corrugated pipe is hermetically connected to the cavities of the first-stage pipe cleaning device body and the second-stage pipe cleaning device body.

[0006] It further includes a dirt discharge device at the rear end, and the dirt discharge device is a dirt storage box or a dirt suction vehicle, and further includes another set of the pipe cleaning device.

[0007] The present invention utilizes this device to execute an artificial tornado dagger composite type multi-stage pipe cleaning method without grooves, a step of attaching the pipe cleaning device at the front end to one end of the work to be cleaned and connecting the other end of the work to be cleaned to the dirt discharge device at the rear end; According to the number of the first-stage suction joint pipes and the second-stage suction joint pipes, open the shut-off valve of the blowing joint of the corresponding multi-channel switching valve, start the air compressor, and pass through the multi-channel switching valve, nozzle, first-stage suction joint pipe and second-stage suction joint pipe, and transport compressed air with a certain air pressure and air volume to the cavities of the first-stage pipe cleaning device body and the second-stage pipe cleaning device body; If the site conditions for pipe cleaning permit, start the vibrating screen, gradually put angular crushed sand particles on the screen mesh of the vibrating screen. The sand and gravel particles filtered by the screen mesh are transported inside the vibrating screen, slide along the supply pipe to the area near the flange at the right end of the first stage, and are involved by the suction action of a plurality of high-speed airflows obliquely incident in the cavity of the first-stage pipe cleaning device body to form a first-stage gas-solid mixed flow, which is transported to the cavity of the second-stage pipe cleaning device body. A plurality of high-speed airflows obliquely and tangentially incident on the cavity of the second-stage pipe cleaning device body can form an artificial tornado, making the movement trajectory of the first-stage gas-solid mixed flow entering the cavity of the second-stage pipe cleaning device body spiral and moving forward so as to contact the inner wall surface of the workpiece to be cleaned, forming a second-stage gas-solid mixed flow. In this process, the sand and gravel particles continuously scratch and collide with the inner wall surface of the workpiece to be cleaned, like a plurality of sharp short knives, adhere to the inner wall surface, and continuously remove and peel off the dirt deposited at the bottom of the pipe. In the pipe cleaning process, if it is found that the first-stage gas-solid mixed flow and the second-stage gas-solid mixed flow formed by the first-stage pipe cleaning device and the second-stage pipe cleaning device cannot achieve the expected pipe cleaning effect, in addition to devising to increase the wind pressure and air volume of the compressed air sent from the air compressor, the inclination angles of the first-stage suction joint pipe and the second-stage suction joint pipe can be adjusted. Furthermore, the movement states of the first-stage gas-solid mixed flow and the second-stage gas-solid mixed flow generated in the cavities of the first-stage pipe cleaning device body and the second-stage pipe cleaning device body can be adjusted, thereby achieving the expected pipe cleaning effect. This process includes the above steps.

[0008] Discharge the removed dirt to the dirt discharge device.

Advantages of the Invention

[0009] A tornado is a local meteorological disaster. In the areas it passes through, serious damages often occur, such as trees being uprooted, vehicles overturning, large-scale crops and fruit trees being instantly destroyed, traffic being blocked, houses collapsing, and humans and livestock being harmed. In nature, a tornado is an upright hollow tubular rotating airflow that often occurs between the bottom of a cumulonimbus cloud and the Earth's surface. The wind speed is usually 30 - 130 m / s, the diameter is less than 2 km, the activity range is 0 - 25 km, and the duration is about 10 minutes. Its formation conditions include three aspects: wind shear (induced vortex) near the ground, vertical movement, and unstable energy. Since a tornado has the characteristics of extremely large energy and strong suction force, based on the formation principle of a tornado, artificial tornadoes are creatively used in engineering and technical fields such as solar energy - tornado power plants and dust / smoke suction, and have remarkable advantages such as being environmentally friendly, clean, and highly efficient.

[0010] Specifically, different from the normal methods based on high-pressure water jets, hydraulic pulse vibrations, rubber pipe cleaning devices, chemical cleaning agents, etc. that are used for cleaning existing underground pipes (culverts) / drill strings, the present invention is based on the formation principle of tornadoes. A pipe cleaning device (including those of the first stage and the second stage, and it may also be a multi-stage one combining the two) is connected to one end of the pipe (culvert) / drill string to be cleaned. When a pneumatic compressor continuously transports compressed air with a certain wind pressure and air volume to a plurality of nozzles and suction joint pipes of the pipe cleaning device through a multi-channel switching valve, since the axis of the suction joint pipe of the plurality of first-stage pipe cleaning devices and the axis of the cavity of the first-stage pipe cleaning device are obliquely intersecting in the same plane (the included angle is 20° to 70°), a plurality of compressed air that enters the cavity of the first-stage pipe cleaning device through the suction joint pipe of the first-stage pipe cleaning device gather in the cavity and then move forward. When flowing through the contraction part (Laval nozzle) provided in the cavity of the first-stage pipe cleaning device, the flow velocity increases. Since the axes of the suction joint pipes of the plurality of second-stage pipe cleaning devices are all inclined and in contact with the wall surface of the cavity of the second-stage pipe cleaning device (the inclination angle is 25° to 75°), a plurality of compressed air fluxes that flow into the cavity of the second-stage pipe cleaning device at high speed in the tangential direction can form an air flow (i.e., an artificial tornado) that is inclined and in contact with the inner wall of the second-stage pipe cleaning device and advances while rotating. In addition, considering that it is easier to realize a cylindrical shape for the machining and manufacturing of the suction joint pipe, in order to further increase the flow velocity when the compressed air provided by the pneumatic compressor enters the cavity of the pipe cleaning device, one nozzle with a contraction section is connected to the inlet end of each suction joint pipe, and the two can use a screwing method, which makes it easy to detach and replace. Also, the crushed sand with edges and corners that slides into the right end of the first-stage pipe cleaning device through the vibrating screen is strongly sucked and involved by a plurality of air flows, and advances spirally along the inner wall of the workpiece to be cleaned along with the artificial tornado generated in the cavity of the multi-stage pipe cleaning device.During the movement process, the angular crushed sand scratches and collides with the inner wall surface of the workpiece to be cleaned like a sharp dagger, thereby removing the dirt adhering to the inner wall surface, and discharging it from the workpiece to be cleaned along with the strong suction of the artificial tornado. In addition, the number and combination method of the first-stage pipe cleaning device and the second-stage pipe cleaning device can be flexibly adjusted according to the on-site working conditions.

[0011] The other end of the workpiece to be cleaned may be communicated with the dirt storage box or the dirt suction vehicle through a high-pressure rubber pipe. Both ends of the workpiece to be cleaned are communicated with the multi-stage pipe cleaning device. Next, the multi-stage pipe cleaning device located on one side of the outlet end of the workpiece to be cleaned may be communicated with the dirt storage box or the dirt suction vehicle through a high-pressure rubber pipe. When directly communicating with the dirt storage box, the gas-solid mixed flow mixed with sand and dirt is directly transported to the dirt storage box along the high-pressure rubber pipe. When the entire cleaning operation is completed, the solid particle mixture in the dirt storage box is sorted and separated, and the reusable crushed sand is separated and recycled. When directly communicating with the dirt suction vehicle, in addition to the original power of the gas-solid mixed flow mixed with sand and dirt to move forward in a spiral shape, the dirt suction vehicle provides additional suction force, thereby increasing the suction removal efficiency of dirt and the like. When communicating with the dirt suction vehicle after communicating with the multi-stage pipe cleaning device, the suction effect of the dirt suction vehicle on the air in the cavity of the multi-stage pipe cleaning device can generate the effect of an artificial tornado at the outlet end of the workpiece to be cleaned, thereby further enhancing the spiral suction removal effect of the gas-solid mixed flow mixed with sand and dirt.

[0012] In consideration of the fact that the effects of the artificial tornado generated at different suction angles are also different, the present invention further proposes a pipe cleaning device with an adjustable suction angle. That is, the inclination angle of the suction joint pipe of the pipe cleaning device can be flexibly adjusted according to the actual working conditions. This function is realized by installing a connecting rod type angle changing mechanism, a rigid sleeve, and a flexible corrugated pipe assembly on the outer wall surface of the pipe cleaning device. The flexible corrugated pipe is in sealed communication with the cavity of the pipe cleaning device. The rigid sleeve is coaxially fitted outside the flexible corrugated pipe, and the rigid sleeve is not fixedly connected to the flexible corrugated pipe and the outer wall surface of the pipe cleaning device. The central part of the rigid sleeve is hinged to the telescopic guide rod of the connecting rod type angle changing mechanism, and the connecting rod type angle changing mechanism is slidably connected to the outer wall surface of the pipe cleaning device. That is, the guide screw of the connecting rod type angle changing mechanism is slidable along the guide groove of the S-shaped guide rail fixedly connected to the outer wall surface of the pipe cleaning device and is fixed at an appropriate position, so as to achieve the purpose of adjusting the inclination angle of the flexible corrugated pipe. Thereby, the rotation direction, movement mode, and suction effect of the artificial tornado change.

[0013] As described above, based on the formation principle of tornadoes, the present invention generates artificial tornadoes in the existing underground pipes (culverts) / drill strings to be cleaned, and utilizes the rotational movement and strong suction force of the artificial tornadoes to entrain abrasive sand with edges and corners along the inner wall surface of the pipes (culverts) / drill strings to be cleaned from one end and move it spirally to the other end. In this process, the sand and gravel scratch and collide with the inner wall surface of the pipes (culverts) / drill strings, adhere to the inner wall surface of the pipes (culverts) / drill strings, remove the dirt deposited at the bottom, and are discharged from the pipes (culverts) / drill strings by the action of the artificial tornadoes or the suction force provided by the artificial tornadoes and the dirt suction vehicle. After the used abrasive sand is screened, it can be reused. Thereby, it is possible to realize an efficient and environmentally friendly pipe cleaning operation without using water. The present invention can be applied to the cleaning operation under the condition of no-groove of pipes (culverts) / drill strings of multiple types such as flanged, threaded, and plain ends at the ends. Compared with the conventional ordinary pipe cleaning methods, it has remarkable advantages such as safety, high efficiency, low carbon, and environmental friendliness, and has a very broad future for application and popularization.

Brief Description of the Drawings

[0014]

Fig. 1(a)

Fig. 1(b)

Fig. 1(c)

Fig. 2

Fig. 3(a)

Fig. 3(b)

Fig. 3(c)

Fig. 3(d)

Fig. 4(a)

Fig. 4(b)

Fig. 4(c)

Fig. 5(a)

Fig. 5(b)

Fig. 6(a)

Fig. 6(b)

Fig. 7

Fig. 8(a)

Fig. 8(b)

Mode for Carrying Out the Invention

[0015] Specific technical solution means of the present invention will be described with reference to the embodiments.

[0016] As shown in FIGS. 1(a) - 1(c) and FIGS. 4(a) - 4(c), the present invention relates to an artificial tornado dagger composite type multi - stage pipe cleaning device without grooves, mainly composed of a vibrating screen 11, an air compressor 12, a multi - channel switching valve 13, a dirt storage box 14 or a dirt suction vehicle 15, a first - stage pipe cleaning device 21, a second - stage pipe cleaning device 22, an S - type guide rail 31, a guide screw 32, an adjustment nut 33, a telescopic guide rod 34, a rigid sleeve 36, a flexible corrugated pipe 35, and other accessory parts.

[0017] The pipe (culvert) or drill string to be cleaned is abbreviated as the work 01 to be cleaned.

[0018] The vibrating screen 11 plays a role of screening crushed sand with edges and corners that is put into the interior of the pipe cleaning device and participates in the pipe cleaning operation. It can not only effectively prevent the pipeline from being blocked when a large amount of sand and gravel is intensively input, but also screen the size of the sand and gravel (when the sand and gravel particles are too large, a greater suction force of the artificial tornado is required, which is difficult to be involved in during the pipe cleaning process, and the movement trajectory is difficult to control, affecting the pipe cleaning effect; when the sand and gravel particles are too small, the scratching and collision effects on the inner wall surface of the work 01 to be cleaned are weak, and the cleaning effect is not good). The size of the particles that can pass through the screen of the vibrating screen 11 is 1 - 10 mm, and the vibrating screen 11 is fixedly connected to the right - hand end flange 211 of the first - stage of the first - stage pipe cleaning device 21 through a supply pipe 110 and an inlet flange 111.

[0019] The multi-channel switching valve 13 serves to distribute and transport the compressed air sent from the air compressor 12 according to needs. As shown in FIG. 2, it mainly consists of a suction joint 130, a hollow multi-channel switching valve body 131, and a blow-off joint 132. In order to increase the flow rate of transporting compressed air to a plurality of first-stage suction joint pipes 213 and second-stage suction joint pipes 223 uniformly distributed in the circumferential direction of the outer wall surfaces of the first-stage pipe cleaning device 21 and the second-stage pipe cleaning device 22, nozzles 133 each having an internal flow path with a contracting cross-section are fixedly connected to the inlet ends of each of the first-stage suction joint pipes 213 and the second-stage suction joint pipes 223. The number of blow-off joints 132 needs to be equal to or more than the sum of the numbers of the first-stage suction joint pipes 213 and the second-stage suction joint pipes 223. A shut-off valve capable of adjusting the opening and closing of the air flow of the compressed air and the magnitude of the flow rate is provided on the blow-off joint 132. A high-pressure rubber tube is used for sealed connection between the blow-off joint 132 and the nozzle 133. Also, the wind pressure and air volume of the compressed air transported from the air compressor 12 need to meet the requirements of the on-site working conditions. Air can be supplied in a manner where one air compressor or a plurality of air compressors are connected in parallel. The number and connection method of the multi-channel switching valve 13 should be flexibly adjusted according to the on-site working conditions.

[0020] As shown in FIGS. 4(a) to 4(c) and FIGS. 5(a) and 5(b), the first-stage pipe cleaning device 21 mainly consists of a first-stage right-end flange 211, a first-stage pipe cleaning device main body 212, a first-stage suction joint pipe 213, and a first-stage left-end flange 214. It utilizes the suction force of a plurality of airflows that flow into the cavity of the first-stage pipe cleaning device main body 212 at high speed from a plurality (3 to 8) of first-stage suction joint pipes 213 uniformly distributed in the circumferential direction of its outer wall surface to suck the angular gravel particles that continuously slide in through the supply pipe 110, and plays a role in forming a first-stage gas-solid mixed flow (air + gravel). A contraction part (Laval nozzle) is provided in front of the first-stage suction joint pipe 213 on the left side of the cavity of the first-stage pipe cleaning device main body 212. When the airflow flows, its flow velocity can be increased, and the suction effect on the gravel particles can be enhanced. Since the main purpose of the first-stage pipe cleaning device 21 is to continuously suck the gravel particles and form a first-stage gas-solid mixed flow, the axis of the first-stage suction joint pipe 213 and the axis of the cavity of the first-stage pipe cleaning device main body 212 are obliquely intersecting in the same plane (the included angle is 20° to 70°). At this time, no artificial tornado that moves spirally is generated. In order to form an artificial tornado in the cavity of the first-stage pipe cleaning device 21, it is necessary to adjust the inclination arrangement method of the first-stage suction joint pipe 213 and the cavity of the first-stage pipe cleaning device main body 212.

[0021] As shown in FIGS. 4(a) to 4(c), FIGS. 6(a) and 6(b), the second-stage pipe cleaning device 22 mainly consists of a second-stage right-end flange 221, a second-stage pipe cleaning device main body 222, a second-stage suction joint pipe 223 and a second-stage left-end flange 224. It utilizes the artificial tornado generated by a plurality of airflows (3 to 8) that flow into the cavity of the second-stage pipe cleaning device main body 222 at high speed from the second-stage suction joint pipes 223 uniformly distributed in the circumferential direction of its outer wall surface to change the movement trajectory of the first-stage gas-solid mixed flow formed by the first-stage pipe cleaning device 21, and plays the role of forming a second-stage gas-solid mixed flow that moves forward in a spiral shape along the inner wall surface of the workpiece 01 to be cleaned. It also plays a certain suction role for the sand and gravel particles that slide in through the vibrating screen 11. Driven and involved by the artificial tornado, the sand and gravel particles in the second-stage gas-solid mixed flow are like sharp short knives, continuously scratching and colliding with the inner wall surface of the workpiece 01 to be cleaned, removing the dirt adhering to the inner wall surface and deposited at the bottom, being sucked and involved by the artificial tornado and discharged outside the pipe, thereby achieving the effect of cleaning the inner wall of the pipe (culvert) or drill string. Also, since the main purpose of the second-stage pipe cleaning device 22 is to form an artificial tornado, that is, to form an air flow with tangential and vertical movement and strong suction force, the axis of the second-stage suction joint pipe 223 and the wall surface of the cavity of the second-stage pipe cleaning device main body 222 are in inclined contact (the inclination angle is 25° to 75°), and a plurality of compressed air fluxes flowing into the cavity of the second-stage pipe cleaning device at high speed in the tangential direction can form an air flow (i.e., an artificial tornado) that is inclined in contact with the inner wall of the second-stage pipe cleaning device and advances in a spiral shape. If the intensity of the artificial tornado generated by one second-stage pipe cleaning device 22 is limited and the formed second-stage gas-solid mixed flow cannot achieve an ideal pipe cleaning effect, a plurality of second-stage pipe cleaning devices 22 can be connected in series to improve the intensity of the artificial tornado.

[0022] As shown in Fig. 7, the first-stage suction joint pipe 213 and the second-stage suction joint pipe 223 are designed as adjustable joint pipes. The adjustable joint pipe has a structure in which the flexible corrugated pipe 35 and the rigid sleeve 36 are coaxially fitted and the arrangement angle is adjustable. The S-shaped guide rail 31, the guide screw 32, the adjustment nut 33, and the telescopic guide rod 34 constitute a connecting rod type angle changing mechanism. As shown in Fig. 8(a) and Fig. 8(b), specifically, the S-shaped guide rails 31 are uniformly distributed at intervals on the outer wall surfaces of the first-stage pipe cleaning device 21 and the second-stage pipe cleaning device 22. The S-shaped guide rails 31 are fixed and connected to the outer wall surfaces of the pipe cleaning devices with screws or strong adhesives. A slider fitted in the guide groove 311 is provided at the bottom end of the guide screw 32. The guide screw 32 is slidable in an S shape along the guide groove 311. A plurality of position regulating holes 312 are provided at intervals on the upper surface of the guide groove 311. A position regulating base 321 with screw holes on both sides is provided at the lower part of the guide screw 32. After the guide screw 32 slides to an appropriate position, the position regulating base 321 and the position regulating holes 312 can be fixedly connected through screws to realize the fixation of the guide screw 32. The adjustment nut 33 can rotate up and down freely along the screw body screw of the guide screw 32. One end of the telescopic guide rod 34 is fixedly connected to the central part of the adjustment nut 33. When the adjustment nut 33 is rotated to an appropriate position, it can be tightened with the clamping nuts 331 installed on both the upper and lower sides thereof. The other end of the telescopic guide rod 34 is hinged to the rigid sleeve 36. The rigid sleeve 36 is coaxially fitted with the flexible corrugated pipe 35. The flexible corrugated pipe 35 is hermetically connected to the cavities of the first-stage pipe cleaning device body 212 and the second-stage pipe cleaning device body 222. By adjusting the length of the telescopic guide rod 34 and the positions of the guide screw 32 and the adjustment nut 33, the angle of the rigid sleeve 36 can be adjusted, and further the angle adjustment of the flexible corrugated pipe 35 can be realized.

[0023] The type of the joint of the actual workpiece 01 to be cleaned is not fixed, and there are many types of flanges, screws or plain ends. Therefore, the type of the joint of the outlet flange 23 connected to the end of the workpiece 01 to be cleaned should be flexibly selected according to the actual working conditions. As shown in Fig. 3(a), when the joint of the workpiece 01 to be cleaned is a flange, the second-stage left-end flange 224 can be directly selected and fixed for connection. When the joint of the workpiece 01 to be cleaned is a screw, the screwed outlet flange 231 with a screw joint on one side can be selected and fixed for connection. As shown in Figs. 3(b), 3(c), and 3(d), when the joint of the workpiece 01 to be cleaned is a plain end, the plain-end connection type outlet flange 232 having a locking groove 2321, a positioning hole 2322, a connection screw hole 2323, and an expansion seal ring 2324 can be selected. The expansion seal ring 2324 is made of rubber and can be expanded or exhausted and contracted by an expansion valve 2325. The expansion seal ring 2324 is fitted in the locking groove 2321, and the expansion valve 2325 of the expansion seal ring 2324 extends downward from the positioning hole 2322. In order to facilitate the connection with the end of the workpiece 01 of the plain-end joint type to be cleaned, first, the expansion seal ring 2324 cannot be filled with air and is in a contracted state. The plain-end connection type outlet flange 232 with an appropriate size is fitted to the plain-end joint of the workpiece 01 to be cleaned, and a screw is used to penetrate the connection screw hole 2323 and fix and connect with the inner wall of the workpiece 01 to be cleaned. Furthermore, a small air compressor is used to fill the expansion seal ring 2324 with air by the expansion valve 2325 and expand it until it is in close contact with the inner wall surface of the workpiece 01 to be cleaned, thereby realizing the fixed connection between the two.

[0024] The flanges are connected by bolts 25.

[0025] When it is necessary to perform trenchless in-situ pipe cleaning on the inside of an existing underground pipe (culvert) that has been used for a certain period, or to clean the inside of a drill string after excavation work, first, it is necessary to reasonably select an appropriate pipe cleaning device based on the size of the workpiece 01 to be cleaned, the type of joint, and the deposition status of internal dirt.

[0026] Seal and connect the components of each part according to the actual working conditions on site to ensure that the pipelines and joints do not leak. Furthermore, according to the number of the first-stage suction joint pipes 213 and the second-stage suction joint pipes 223, open the shut-off valve of the blowing joint 132 of the corresponding multi-channel switching valve 13, start the air compressor 12, and transport compressed air with a certain air pressure and air volume to the cavities of the first-stage pipe cleaning device body 212 and the second-stage pipe cleaning device body 222 through the multi-channel switching valve 13, a plurality of high-pressure rubber pipes, a plurality of nozzles 133, the first-stage suction joint pipes 213 and the second-stage suction joint pipes 223. If the on-site situation of pipe cleaning permits, it is also possible to directly purchase sand and gravel particles with edges and corners of the required size from the building materials market, or to crush and manufacture large stones or construction solid waste to the required size using a rock crusher. Start the vibrating screen 11, gradually put the angular crushed sand particles on the screen mesh of the vibrating screen 11, and the sand and gravel particles with a size within the range of 1-10 mm after being filtered by the screen mesh are conveyed into the vibrating screen 11 and slide along the supply pipe 110 to an area near the right-end flange 211 of the first stage. Due to the suction effect of a plurality of high-speed airflows obliquely incident in the cavity of the first-stage pipe cleaning device body 212, the sand and gravel particles are involved to form a first-stage gas-solid mixed flow, which is conveyed to the cavity of the second-stage pipe cleaning device body 222. A plurality of high-speed airflows obliquely and tangentially incident in the cavity of the second-stage pipe cleaning device body 222 can form an artificial tornado, making the movement trajectory of the first-stage gas-solid mixed flow entering the cavity of the second-stage pipe cleaning device body 222 spiral and moving forward to contact the inner wall surface of the work piece 01 to be cleaned, thus forming a second-stage gas-solid mixed flow. In this process, the sand and gravel particles continuously scratch and collide with the inner wall surface of the work piece 01 to be cleaned, like a plurality of sharp short knives, adhere to the inner wall surface, continuously remove and peel off the dirt deposited at the bottom of the pipe.

[0027] As shown in Fig. 1(a), when the outlet end of the work piece 01 to be cleaned communicates with the dirt storage box 14, the removed dirt is sucked by the artificial tornado, entrained, and mixed into the second-stage gas-solid mixed flow and transported to the dirt storage box 14. As shown in Fig. 1(b), when the outlet end of the work piece 01 to be cleaned communicates with the dirt suction vehicle 15, the removed dirt is sucked by the artificial tornado, entrained, and due to the suction action of the dirt suction vehicle 15, it is mixed into the second-stage gas-solid mixed flow and transported to the dirt suction vehicle 15. As shown in Fig. 1(c), when the outlet end of the work piece 01 to be cleaned communicates with both the first-stage pipe cleaning device 21 and the second-stage pipe cleaning device 22, the removed dirt is sucked by twice the artificial tornado, entrained, and transported to the dirt storage box 14 or the dirt suction vehicle 15.

[0028] During the pipe cleaning process, if it is found that the first-stage gas-solid mixed flow and the second-stage gas-solid mixed flow formed by the first-stage pipe cleaning device 21 and the second-stage pipe cleaning device 22 cannot achieve the expected pipe cleaning effect, in addition to devising to increase the air pressure and air volume of the compressed air sent from the air compressor, the fixed first-stage suction joint pipe 213 and the second-stage suction joint pipe 223 can be changed to a structure with adjustable inclination angles. By reasonably adjusting the positions of the guide screw 32, the adjustment nut 33, the telescopic guide rod 34, the flexible corrugated pipe 35, and the rigid sleeve 36, the incident states of the multiple high-speed airflows entering the cavities of the first-stage pipe cleaning device main body 212 and the second-stage pipe cleaning device main body 222 through the first-stage suction joint pipe 213 and the second-stage suction joint pipe 223 can be adjusted. Furthermore, the movement states of the first-stage gas-solid mixed flow and the second-stage gas-solid mixed flow generated in the cavities of the first-stage pipe cleaning device main body 212 and the second-stage pipe cleaning device main body 222 can be adjusted, thereby achieving the expected pipe cleaning effect.

[0029] After the pipe cleaning operation is completed, insert the CCTV pipe detection robot (pipe closed-circuit television detection system) into the work 01 to be cleaned, and the condition of the inner wall surface of the work 01 to be cleaned after being cleaned by the present invention can be confirmed. After confirming that the cleaning effect has reached the predetermined requirements, remove each component and restore the on-site environment.

Claims

1. An artificial tornado dagger composite type multi-stage pipe cleaning device without grooves, comprising a pipe cleaning device at the tip, wherein the pipe cleaning device includes a first-stage pipe cleaning device (21) and a second-stage pipe cleaning device (22). The first-stage pipe cleaning device (21) includes a first-stage right-end flange (211), a first-stage pipe cleaning device main body (212), and a first-stage left-end flange (214) connected in sequence. A plurality of first-stage suction joint pipes (213) are uniformly distributed in the circumferential direction of the outer wall surface of the first-stage pipe cleaning device (21). The axis of the first-stage suction joint pipe (213) and the axis of the cavity of the first-stage pipe cleaning device main body (212) are obliquely intersecting in the same plane. The second-stage pipe cleaning device (22) includes a second-stage right-end flange (221), a second-stage pipe cleaning device main body (222), and a second-stage left-end flange (224) connected in sequence. A plurality of second-stage suction joint pipes (223) are uniformly distributed in the circumferential direction of the outer wall surface of the second-stage pipe cleaning device (22). The axis of the second-stage suction joint pipe (223) is inclined and in contact with the wall surface of the cavity of the second-stage pipe cleaning device main body (222). The second-stage right-end flange (221) is connected to the first-stage left-end flange (214), whereby the first-stage pipe cleaning device (21) and the second-stage pipe cleaning device (22) are hermetically connected. The first-stage suction joint pipe (213) and the second-stage suction joint pipe (223) are respectively hermetically connected to the blowing joint (132) of a multi-channel switching valve (13). The multi-channel switching valve (13) further includes a suction joint (130) and a hollow multi-channel switching valve main body (131). The suction joint (130) is connected to an air compressor (12). A nozzle (133) having an internal flow path with a shrinking cross-section is connected to each blowing joint (132). A shut-off valve capable of adjusting the opening and closing of the air flow of compressed air and the magnitude of the flow rate is provided on the blowing joint (132). The first-stage right-end flange (211) of the first-stage pipe cleaning device (21) is fixedly connected to the inlet flange (111) of a supply pipe (110), and the supply pipe (110) is connected to the discharge port of a vibrating screen (11). An artificial tornado dagger composite type multi-stage pipe cleaning device without grooves, characterized in that.

2. Further comprising a dirt discharge device at the rear end, wherein the pipe cleaning device at the front end is attached to one end of the work piece (01) to be cleaned, and the other end of the work piece (01) to be cleaned is connected to the dirt discharge device at the rear end. The artificial tornado dagger composite type multi-stage pipe cleaning device without grooves according to claim 1, characterized in that.

3. The artificial tornado dagger composite type multi-stage pipe cleaning device without grooves according to claim 1, characterized in that the first-stage suction joint pipe (213) and the second-stage suction joint pipe (223) are adjustable joint pipes.

4. The adjustable joint pipe includes a rigid sleeve (36) and further includes a connecting rod type angle changing mechanism. The connecting rod type angle changing mechanism includes an S-shaped guide rail (31), a guide screw (32), an adjustment nut (33) and a telescopic guide rod (34). The S-shaped guide rails (31) are uniformly distributed on the outer wall surfaces of the first-stage pipe cleaning device (21) and the second-stage pipe cleaning device (22) at intervals. A guide groove (311) is provided in the S-shaped guide rail (31). A slider fitted in the guide groove (311) is provided at the bottom end of the guide screw (32). The guide screw (32) is slidable in an S-shape along the guide groove (311). A plurality of position regulating holes (312) are provided at intervals on the upper surface of the guide groove (311). A position regulating base (321) with screw holes on both sides is provided at the lower part of the guide screw (32). After the guide screw (32) slides to an appropriate position, the position regulating base (321) and the position regulating holes (312) are fixedly connected through screws, and the fixing of the guide screw (32) can be realized. The screw of the screw body of the guide screw (32) is screwed with the adjustment nut (33). The adjustment nut (33) is fixed to one end of the telescopic guide rod (34), and tightening nuts (331) are provided on both the upper and lower sides of the adjustment nut (33). The other end of the telescopic guide rod (34) is hinged to the rigid sleeve (36). The rigid sleeve (36) is coaxially fitted and connected with the flexible corrugated pipe (35). The flexible corrugated pipe (35) is hermetically connected to the cavities of the first-stage pipe cleaning device main body (212) and the second-stage pipe cleaning device main body (222). The artificial tornado dagger composite type multi-stage pipe cleaning device without grooves according to claim 3, characterized in that.

5. An artificial tornado dagger composite type multi-stage pipe cleaning method without grooves, which uses the artificial tornado dagger composite type multi-stage pipe cleaning device according to any one of claims 1 to 4, attaching the pipe cleaning device at the tip to one end of the workpiece (01) to be cleaned, and connecting the other end of the workpiece (01) to be cleaned to the dirt discharge device at the rear end; According to the number of the first-stage suction joint pipes (213) and the second-stage suction joint pipes (223), opening the shut-off valve of the blow joint (132) of the corresponding multi-channel switching valve (13), starting the air compressor (12), and passing through the multi-channel switching valve (13), the nozzle (133), the first-stage suction joint pipe (213) and the second-stage suction joint pipe (223), transporting compressed air with a certain air pressure and air volume to the cavities of the first-stage pipe cleaning device main body (212) and the second-stage pipe cleaning device main body (222); Starting the vibrating screen (11), putting angular crushed sand particles on the screen of the vibrating screen (11), the sand and gravel particles filtered by the screen are transported into the vibrating screen (11), slide along the supply pipe (110) to the area near the right-end flange (211) of the first stage, and are involved by the suction action of a plurality of high-speed airflows obliquely incident in the cavity of the first-stage pipe cleaning device main body (212) to form a first-stage gas-solid mixed flow, which is transported to the cavity of the second-stage pipe cleaning device main body (222). A plurality of high-speed airflows obliquely and tangentially incident on the cavity of the second-stage pipe cleaning device main body (222) can form an artificial tornado, making the movement trajectory of the first-stage gas-solid mixed flow entering the cavity of the second-stage pipe cleaning device main body (222) spiral and moving forward to contact the inner wall surface of the workpiece (01) to be cleaned to form a second-stage gas-solid mixed flow. In this process, the sand and gravel particles continuously scratch and collide with the inner wall surface of the workpiece (01) to be cleaned, like a plurality of sharp short knives, adhere to the inner wall surface, and continuously remove and peel off the dirt deposited at the bottom of the pipe. In the pipe cleaning process, if it is found that the first-stage gas-solid mixed flow and the second-stage gas-solid mixed flow formed in the first-stage pipe cleaning device (21) and the second-stage pipe cleaning device (22) cannot achieve the expected pipe cleaning effect, in addition to devising to increase the wind pressure and air volume of the compressed air sent from the air compressor, the inclination angles of the first-stage suction joint pipe (213) and the second-stage suction joint pipe (223) can be adjusted. Furthermore, the movement states of the first-stage gas-solid mixed flow and the second-stage gas-solid mixed flow generated in the cavities of the first-stage pipe cleaning device main body (212) and the second-stage pipe cleaning device main body (222) are adjusted, thereby achieving the expected pipe cleaning effect, and discharging the removed dirt to the dirt discharging device, characterized in that it comprises a method for multi-stage pipe cleaning of an artificial tornado dagger composite type without grooves.

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