Artificial tornado dagger combined grooveless multi-stage pipe cleaning device 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 relates to the technical field of internal cleaning of existing underground pipes (culverts) and drill strings, and more particularly to an artificial tornado dagger combined grooveless multi-stage pipe cleaning device and a pipe cleaning method thereof. [Background technology]

[0002] There is no doubt that at a certain depth underground in cities, various pipes (culverts) for water supply, wastewater discharge, thermal energy, electricity, oil, and gas crisscross the earth like the human body's vascular network. They are essential underground infrastructure lifelines for maintaining the normal functioning of cities, transmitting materials, resources, and information, including water supply, drainage, thermal energy, electricity, fuel gas, oil, and communications, day and night. Their performance directly affects the quality of life of urban residents and the normal operation of agriculture and industry. However, after a period of use, significant amounts of dirt inevitably remain on the pipe walls and within the pipes. If not promptly cleaned, the effective flow cross-section of the pipes will inevitably decrease, affecting the normal transport of fluids necessary for daily life and production, contaminating the transported fluids, reducing the quality of life and agricultural and industrial production, and accelerating corrosion, damage, and breakdown of the pipes themselves, resulting in significant unnecessary losses. Therefore, timely cleaning of underground pipes (culverts) in cities with long service lives is essential. When the pipe (culvert) is large, it is possible to manually clean it by dispatching a dedicated technician to enter the pipe (culvert). However, when the pipe (culvert) is small and cannot be manually entered, an appropriate unmanned trenchless pipe cleaning method must be used. Currently, commonly used unmanned trenchless pipe cleaning methods include pipe cleaning using high-pressure water jets from self-advancing nozzles, pipe cleaning using hydraulic pulse vibration, pipe cleaning by scratching with a rubber pipe cleaning device, pipe cleaning by excavation using a pipe robot, and pipe cleaning using chemical cleaners. While these methods can achieve trenchless cleaning of underground pipes (culverts), they have serious problems, such as a significant waste of water resources during pipe cleaning, difficulty in quickly discharging wastewater after pipe cleaning, obstructions to the movement of the pipe cleaning device or pipe robot through the pipe (culvert), incomplete cleaning of the pipe wall, low pipe cleaning efficiency, and high toxicity of chemical cleaners.

[0003] A drill string is a combination of drills that connects surface drilling equipment (drill unit / slurry pump / air compressor, etc.) with underground drilling machines (drill bit / grinding head, etc.) or bottom-hole drive devices (screw drill / turbo drill, etc.), and is primarily composed of kelly, special couplings, drill rods, drill collars, etc. Its basic functions include raising and lowering the drill bit, applying drilling pressure, transmitting power, transporting cleaning fluid, and performing special work inside the mine (dealing with underground troubles), making it one of the important components indispensable for drilling operations. However, after each drilling operation, residues of cleaning fluids such as slurry adhere to both the inner and outer walls of the drill string. If not removed promptly, this can easily lead to problems such as corrosion of the drill string, clogging of the flow passages inside the drill string, and even rupture or breakage. Currently, it is easy to remove residues attached to the outer wall surface of a drill string, but due to limitations on the inner diameter size of the drill string, it is not easy to remove residues attached to the inner wall surface of the drill string. The commonly used method for removing residues attached to the inner wall surface of a drill string is the same as the grooveless unmanned pipe cleaning method described above, and the problem to be solved is basically the same. Summary of the Invention [Problem to be solved by the invention]

[0004] To address the above technical issues, the present invention utilizes the principle of tornado formation to generate an artificial tornado using a special internal flow path structure of a pipe cleaning device, which then picks up crushed sand that is not perfectly round and has edges or corners, and moves it in a spiral pattern from one end to the other along the inner wall of the workpiece (abbreviated as the cleaning target) like a sharp dagger. Crushed sand can be purchased ready-made from a building materials market, or it can be produced on-site by using a rock crusher to crush large stones or construction solid waste such as waste (asphalt) concrete blocks, crushed stone blocks, and brick waste generated during new construction, renovation, expansion, or demolition to the required size, thereby realizing the reuse of construction solid waste. During this process, the artificial tornado moves simultaneously in both tangential and vertical directions, continuously sucking in and engulfing the crushed sand dropped from the vibrating screen, causing a spiral, forward movement along the wall. The scratches and collisions between the crushed sand and the inner wall of the workpiece being cleaned contribute to the removal of dirt adhering to the pipe wall, and the strong suction force of the artificial tornado contributes to the rapid removal of dirt that falls from the inner wall of the pipe (culvert) / drill string and accumulates inside the pipe (culvert) / drill string. This enables efficient cleaning of existing underground pipes (culverts) or drill strings without trenches or water. [Means for solving the problem]

[0005] The specific technical solutions are as follows: An artificial tornado dagger composite grooveless multi-stage pipe cleaning device, comprising a tip pipe cleaning device, the pipe cleaning device comprising 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 body, and a first-stage left-end flange connected in sequence, and 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, and the axis of the first-stage suction joint pipe and the axis of the cavity of the first-stage pipe cleaning device 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 body, and a second-stage left-end flange connected in sequence, and a plurality of second-stage suction coupling pipes are uniformly distributed in the circumferential direction of the outer wall surface of the second-stage pipe cleaning device, and the axis of the second-stage suction coupling pipe and the wall surface of the cavity of the second-stage pipe cleaning device body are inclined and in contact with each other; The right end flange of the second stage is connected to the left end flange of the first stage, thereby sealingly connecting the first stage pipe cleaning device and the second stage pipe cleaning device. The first stage suction joint pipe and the second stage suction joint pipe are respectively sealedly connected to the outlet joint of the multi-channel switching valve, the multi-channel switching valve further includes a suction joint and a hollow multi-channel switching valve body, the suction joint is connected to the air compressor, each outlet joint is connected to a nozzle having an internal flow path with a contracting cross section, and the outlet joint is provided with a shut-off valve that can open and close the compressed air flow and adjust the flow rate; The right end flange of the first stage 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 outlet of the vibrating sieve; the first-stage suction coupling pipe and the second-stage suction coupling pipe are adjustable coupling pipes, the adjustable coupling pipes include a rigid sleeve and a connecting rod type angle change mechanism, the connecting rod type angle change mechanism includes an S-shaped guide rail, a guide screw, an adjustment nut and a telescopic guide rod, the 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, the S-shaped guide rails are provided with guide grooves, the bottom ends of the guide screws are provided with sliders fitted into the guide grooves, the guide screws are free to slide along the guide grooves in an S-shape, a plurality of position-limiting holes are provided with intervals on the upper surface of the guide groove, and a position-limiting base with screw holes on both sides is provided at the bottom of the guide screw, after the guide screw slides to an appropriate position, the position-limiting base and the position-limiting hole can be fixed and connected by screws to realize the fixing of the guide screw; The screw body thread of the guide screw is threaded with the adjustment nut, The adjusting nut is fixed to one end of the telescopic guide rod, and tightening nuts are provided on both the top and bottom of the adjusting nut. The other end of the telescopic guide rod is hingedly connected to a rigid sleeve, the rigid sleeve is coaxially fitted and connected to the flexible corrugated pipe, and the flexible corrugated pipe is sealed and connected to the cavities of the first stage pipe cleaning device body and the second stage pipe cleaning device body.

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

[0007] The present invention uses this device to carry out an artificial tornado dagger combined grooveless multi-stage pipe cleaning method, A step of attaching a 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 a dirt discharge device at the rear end; According to the number of first-stage suction joint pipes and second-stage suction joint pipes, opening the shutoff valves of the corresponding blow-off joints of the multi-channel switching valve, starting the air compressor, and transporting compressed air with a certain air pressure and volume to the cavities of the first-stage pipe cleaning device body and the second-stage pipe cleaning device body through the multi-channel switching valve, the nozzle, the first-stage suction joint pipe and the second-stage suction joint pipe; If the conditions at the pipe cleaning site permit, start the vibrating sieve, gradually put the angular crushed sand particles into the sieve mesh of the vibrating sieve, the sand particles filtered by the mesh are carried into the inside of the vibrating sieve, slide along the supply pipe to the area near the right end flange of the first stage, and the suction action of multiple high-speed air currents entering obliquely in the cavity of the first stage pipe cleaning device body will entangle the sand particles and form a first stage gas-solid mixed flow, which will be carried to the cavity of the second stage pipe cleaning device body, and then the second stage pipe cleaning device body will start. The multiple high-speed airflows entering the cavity obliquely and tangentially can form an artificial tornado, making the first-stage gas-solid mixed flow that entered the cavity of the second-stage pipe cleaning device body spiral in movement, and moving forward to contact the inner wall surface of the workpiece to be cleaned, forming a second-stage gas-solid mixed flow, during which the sand and gravel particles continuously scratch and collide with the inner wall surface of the workpiece to be cleaned, and stick to the inner wall surface like multiple sharp daggers, continuously removing and peeling off the dirt accumulated on the bottom of the pipe; If it is found during the pipe cleaning process that the first-stage gas-solid mixed flow and the second-stage gas-solid mixed flow formed in the first-stage pipe cleaning device and the second-stage pipe cleaning device cannot achieve the expected pipe cleaning effect, measures can be taken to increase the wind pressure and air volume of the compressed air sent out from the air compressor, and the inclination angles of the first-stage suction joint pipe and the second-stage suction joint pipe can be adjusted, and 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 and the second-stage pipe cleaning device main body can be adjusted, thereby achieving the expected pipe cleaning effect.

[0008] The removed dirt is discharged into a dirt discharge device. [Effects of the Invention]

[0009] Tornadoes are localized meteorological disasters that often cause serious damage in their path, including uprooting trees, overturning vehicles, instantly destroying large amounts of crops and fruit trees, blocking traffic, destroying houses, and injuring people and livestock. In nature, tornadoes are upright, hollow, tubular, rotating air currents that often form between the base of a cumulonimbus cloud and the Earth's surface. They typically have wind speeds of 30–130 m / s, a diameter of less than 2 km, a range of activity of 0–25 km, and a duration of approximately 10 minutes. Their formation conditions involve three aspects: wind shear (induced vortex) near the ground, vertical motion, and unstable energy. Tornadoes are characterized by their enormous energy and strong suction force. Based on the principles of tornado formation, artificial tornadoes have been creatively applied in engineering technologies such as solar energy-tornado power plants and dust / smoke suction, offering significant advantages such as environmental friendliness, cleanliness, and high efficiency.

[0010] Specifically, unlike conventional methods based on high-pressure water jets, hydraulic pulse vibrations, rubber pipe cleaning devices, chemical cleaners, etc., which are used to clean existing underground pipes (culverts) / drill strings, this invention is based on the principle of tornado formation, and involves connecting a pipe cleaning device (including first-stage and second-stage devices, and may also be a multi-stage device combining both) to one end of the pipe (culvert) / drill string to be cleaned, and when an air compressor continuously transports compressed air at a constant pressure and volume to the multiple nozzles and suction joint pipes of the pipe cleaning device via a multi-channel switching valve, the axes of the suction joint pipes of the multiple first-stage pipe cleaning devices and the axis of the cavity of the first-stage pipe cleaning device are obliquely aligned in the same plane. Since the axes of the suction joint pipes of the second-stage pipe cleaning devices are all inclined to the wall surface of the cavity of the second-stage pipe cleaning device (the inclination angle is 25° to 75°), the multiple compressed air fluxes flowing tangentially into the cavity of the second-stage pipe cleaning device at high speed can form an air current (i.e., an artificial tornado) that inclines to the inner wall of the second-stage pipe cleaning device and moves forward while rotating. Considering that cylindrical suction coupling pipes are easier to machine and manufacture, a nozzle with a contracted cross section is connected to the inlet end of each suction coupling pipe to further increase the flow rate of the compressed air provided by the air compressor when it enters the cavity of the pipe cleaning device, and the two can be threaded together, making them easy to attach, detach, and replace. Furthermore, crushed sand with edges and corners that passes through the vibrating screen and slides into the right end of the first-stage pipe cleaning device is powerfully sucked in and drawn in by multiple air currents, and then spirals forward along the inner wall of the workpiece to be cleaned along with the artificial tornado created in the cavity of the multi-stage pipe cleaning device.As it moves, the angular crushed sand scratches and collides with the inner wall surface of the workpiece to be cleaned like a sharp dagger, thereby removing dirt that has adhered to the inner wall surface and then expelling it from the workpiece to be cleaned with the powerful suction of the artificial tornado.In addition, the number and combination method of the first-stage pipe cleaning device and second-stage pipe cleaning device can be flexibly adjusted according to the work situation on site.

[0011] The other end of the workpiece to be cleaned may be connected to a dirt storage box or dirt suction vehicle via a high-pressure rubber tube, or both ends of the workpiece to be cleaned may be connected to a multi-stage pipe cleaning device, and then a multi-stage pipe cleaning device located on one side of the outlet end of the workpiece to be cleaned may be connected to the dirt storage box or dirt suction vehicle via a high-pressure rubber tube.When directly connected to the dirt storage box, the gas-solid mixture containing sand and dirt is transported directly to the dirt storage box along the high-pressure rubber tube.After the entire cleaning process is completed, the solid particle mixture in the dirt storage box is sorted and separated, and usable crushed sand is separated and recycled.When directly connected to the dirt suction vehicle, the gas-solid mixture containing sand and dirt is driven spirally forward by the dirt suction vehicle, which provides additional suction force, thereby improving the efficiency of suction removal of dirt, etc. When the device is connected to a multi-stage pipe cleaning device and then to a dirt suction vehicle, the dirt suction vehicle's suction action on the air in the cavity of the multi-stage pipe cleaning device can also create an artificial tornado effect at the outlet end of the workpiece to be cleaned, thereby further enhancing the spiral suction removal effect of the gas-solid mixed flow containing sand, gravel and dirt.

[0012] Considering that different suction angles result in different artificial tornado effects, the present invention also proposes a pipe cleaning device with adjustable suction angles. That is, the inclination angle of the suction coupling pipe of the pipe cleaning device can be flexibly adjusted according to actual working conditions. This function is achieved by installing a connecting rod angle change mechanism, a rigid sleeve, and a flexible corrugated pipe assembly on the outer wall of the pipe cleaning device. The flexible corrugated pipe is sealed and connected to the cavity of the pipe cleaning device, and the rigid sleeve is coaxially fitted around the flexible corrugated pipe, but the rigid sleeve is not fixedly connected to the flexible corrugated pipe or the outer wall of the pipe cleaning device. The center of the rigid sleeve is hingedly connected to the telescopic guide rod of the connecting rod angle change mechanism, and the connecting rod angle change mechanism is slidingly connected to the outer wall of the pipe cleaning device. That is, the guide screw of the connecting rod angle change mechanism slides along the guide groove of the S-shaped guide rail fixedly connected to the outer wall of the pipe cleaning device and is fixed in place, thereby achieving the purpose of adjusting the inclination angle of the flexible corrugated pipe. This changes the rotation direction, movement mode, and suction effect of the artificial tornado.

[0013] As described above, this invention utilizes the tornado formation principle to generate an artificial tornado inside an existing underground pipe (culvert) / drill string to be cleaned. Using the rotational movement and strong suction force of the artificial tornado, crushed sand with edges and corners is drawn along the inner wall surface of the pipe (culvert) / drill string, spiraling from one end to the other. During this process, the sand scratches and collides with the inner wall surface of the pipe (culvert) / drill string, adhering to the inner wall surface and removing dirt accumulated at the bottom. The sand is then removed from the pipe (culvert) / drill string by the action of the artificial tornado or the suction force provided by the artificial tornado and a dirt suction vehicle. The crushed sand can then be sieved and reused. This realizes an efficient, environmentally friendly trenchless pipe cleaning process without using water. The present invention can be applied to cleaning pipes (culverts) / drill strings with multiple types of ends, such as flanged, threaded, and plain ends, under trenchless working conditions. Compared with conventional pipe cleaning methods, the present invention has significant advantages such as safety, high efficiency, low carbon emissions, and environmental friendliness, and has great potential for application and widespread use. [Brief explanation of the drawings]

[0014] [Figure 1(a)] FIG. 1(a) is a schematic diagram of the structure when one end of the workpiece to be cleaned is connected to a dirt storage box and the other end is connected to a pipe cleaning device. [Figure 1(b)] Figure 1(b) is a schematic diagram of the structure when one end of the workpiece to be cleaned is connected to a dirt suction vehicle and the other end is connected to a pipe cleaning device. [Figure 1(c)] FIG. 1(c) is a schematic diagram of the structure when both ends of the workpiece to be cleaned are connected to the pipe cleaning device. [Figure 2] FIG. 2 is a structural schematic diagram of the multi-channel switching valve of the present invention. [Figure 3(a)] FIG. 3(a) is a schematic diagram of a connection method between the pipe cleaning device and the end flanges when both ends of the workpiece to be cleaned are threaded. [Figure 3(b)] FIG. 3(b) is a schematic diagram of a connection method between the pipe cleaning device and the end flanges when both ends of the workpiece to be cleaned are plain ends. [Figure 3(c)] Figure 3(c) is a schematic diagram of the exploded structure of a plain end connection type outlet flange. [Figure 3(d)] Figure 3(d) is a schematic diagram of the overall structure of a plain end connection type outlet flange. [Figure 4(a)] FIG. 4(a) is a schematic diagram of the overall structure of the artificial tornado dagger combined grooveless multi-stage pipe cleaning device according to the present invention. [Figure 4(b)] FIG. 4(b) is a perspective view of the overall structure of the artificial tornado dagger combined grooveless multi-stage pipe cleaning device according to the present invention. [Figure 4(c)] FIG. 4(c) is an exploded view of the overall structure of the artificial tornado dagger combined grooveless multi-stage pipe cleaning device according to the present invention. [Figure 5(a)] FIG. 5(a) is a perspective view of the first stage pipe cleaning device structure of the present invention. [Figure 5(b)] FIG. 5(b) is a cross-sectional view of the first stage pipe cleaning device structure of the present invention. [Figure 6(a)] FIG. 6(a) is a schematic diagram of the second stage pipe cleaning device structure of the present invention. [Figure 6(b)] FIG. 6(b) is a perspective view of the second stage pipe cleaning device structure of the present invention. [Figure 7] FIG. 7 is a schematic diagram showing the overall structure of the pipe cleaning device with adjustable suction angle according to the present invention. [Figure 8(a)] FIG. 8(a) is a perspective view of the structure of the adjustable coupling tube of the present invention. [Figure 8(b)] FIG. 8(b) is a perspective view of the structure of the adjustable coupling tube of the present invention when the components are separated. DETAILED DESCRIPTION OF THE INVENTION

[0015] The specific technical solutions of the present invention will be described with reference to the examples.

[0016] As shown in Figures 1(a) to 1(c) and 4(a) to 4(c), the present invention relates to an artificial tornado dagger combined grooveless multi-stage pipe cleaning device, which mainly consists of a vibrating screen 11, an air compressor 12, a multi-channel switching valve 13, a dirt storage box 14 or a dirt suction car 15, a first-stage pipe cleaning device 21, a second-stage pipe cleaning device 22, an S-shaped guide rail 31, a guide screw 32, an adjusting nut 33, a telescopic guide rod 34, a rigid sleeve 36, a flexible corrugated pipe 35, and other accessories.

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

[0018] The vibrating sieve 11 is fed into the pipe cleaning device and serves the purpose of sieving out crushed sand with edges and corners that are involved in the pipe cleaning process. It can not only effectively prevent the pipeline from being clogged when a large amount of sand and stone is fed in at once, but can also sift out the size of the sand and stone (if the sand and stone particles are too large, the suction force of the artificial tornado must be greater, making them difficult to entrain during the pipe cleaning process and making it difficult to control their movement trajectory, which will affect the effectiveness of the pipe cleaning; if the sand and stone particles are too small, they will not scratch or collide with the inner wall surface of the workpiece 01 to be cleaned, resulting in poor cleaning results). The size of the particles that can pass through the sieve mesh of the vibrating sieve 11 is 1 to 10 mm. The vibrating sieve 11 is fixed and connected to the first-stage right-end flange 211 of the first-stage pipe cleaning device 21 via the supply pipe 110 and the inlet flange 111.

[0019] The multi-channel switching valve 13 distributes and transports the compressed air sent out from the air compressor 12 according to need, and as shown in Figure 2, is mainly composed of a suction joint 130, a hollow multi-channel switching valve body 131, and a discharge joint 132. In order to increase the flow rate of compressed air transported to the multiple 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, a nozzle 133 having an internal flow passage with a contracting cross section is fixedly connected to the inlet end of each of the first-stage suction joint pipes 213 and second-stage suction joint pipes 223. The number of blow-off joints 132 must be equal to or greater than the sum of the numbers of first-stage suction joint pipes 213 and second-stage suction joint pipes 223. The blow-off joints 132 are provided with shut-off valves that can adjust the opening and closing of the compressed air flow and the amount of flow, and the blow-off joints 132 and the nozzles 133 are hermetically connected by high-pressure rubber tubing. In addition, the pressure and volume of the compressed air delivered from the air compressor 12 must meet the requirements of the on-site working conditions, and air can be supplied by one air compressor or by multiple air compressors connected in parallel, and the number and connection method of the multi-channel switching valves 13 should be flexibly adjusted according to the on-site working conditions.

[0020] As shown in Figures 4(a) to 4(c) and Figures 5(a) and 5(b), the first-stage pipe cleaning device 21 is mainly composed 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 uses the suction force of multiple airflows that flow at high speed into the cavity of the first-stage pipe cleaning device main body 212 from multiple (3 to 8) first-stage suction joint pipes 213 that are uniformly distributed circumferentially on its outer wall surface to suck in angular sand and gravel particles that continuously slide in through the supply pipe 110, forming a first-stage gas-solid mixed flow (air + sand and gravel). A contraction section (Laval nozzle) is provided on the left side of the cavity of the first-stage pipe cleaning device main body 212, before the first-stage suction joint pipe 213, which increases the flow rate of the airflow and improves the suction effect on the sand and gravel particles. Since the main purpose of the first-stage pipe cleaning device 21 is to continuously suck in sand and 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°). In this case, no artificial tornado moving in a spiral shape 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 Figures 4(a) to 4(c) and Figures 6(a) and 6(b), the second stage pipe cleaning device 22 is mainly composed 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 changes the movement trajectory of the first stage gas-solid mixed flow formed by the first stage pipe cleaning device 21, using an artificial tornado generated by a plurality of air currents flowing at high speed from a plurality (3 to 8) of second stage suction joint pipes 223 uniformly distributed in the circumferential direction of its outer wall surface into the cavity of the second stage pipe cleaning device main body 222. The artificial tornado plays a role in forming a second-stage gas-solid mixed flow that moves forward in a spiral along the inner wall surface of the workpiece 01 to be cleaned, and also plays a certain suction role on the sand and gravel particles that slide through the vibrating sieve 11. As they are moved and drawn in by the artificial tornado, the sand and gravel particles in the second-stage gas-solid mixed flow act like sharp daggers, continuously scratching and colliding with the inner wall surface of the workpiece 01 to be cleaned, adhering to the inner wall surface and removing the dirt accumulated at the bottom, and then being drawn in by the artificial tornado and drawn out of the pipe, thereby achieving the effect of cleaning the inner wall of the pipe (culvert) or drill string. Furthermore, because the primary purpose of the second-stage pipe cleaning device 22 is to create an artificial tornado, i.e., to create an airflow with tangential and vertical movement and strong suction force, the axis of the second-stage suction coupling pipe 223 and the wall surface of the cavity of the second-stage pipe cleaning device body 222 are inclined (the inclination angle is 25° to 75°), so that multiple compressed air fluxes flowing tangentially into the cavity of the second-stage pipe cleaning device at high speed can form an airflow (i.e., an artificial tornado) that inclines and advances spirally against the inner wall of the second-stage pipe cleaning device. If the strength of the artificial tornado created by a single second-stage pipe cleaning device 22 is limited and the second-stage gas-solid mixed flow created does not achieve an ideal pipe cleaning effect, multiple second-stage pipe cleaning devices 22 can be connected in series to improve the strength 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, and the adjustable joint pipes have a structure in which a flexible corrugated pipe 35 and a rigid sleeve 36 are coaxially fitted together to adjust the arrangement angle, and the S-shaped guide rail 31, guide screw 32, adjustment nut 33 and telescopic guide rod 34 constitute a connecting rod-type angle change mechanism. As shown in Figures 8(a) and 8(b), specifically, 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, and the S-shaped guide rails 31 are fixed and connected to the outer wall surfaces of the pipe cleaning devices with screws or strong adhesive. A slider is provided at the bottom end of the guide screw 32, which is fitted into the guide groove 311. The guide screw 32 is free to slide 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 bottom of the guide screw 32. After the guide screw 32 slides to the appropriate position, the position-regulating base 321 and the position-regulating hole 312 are fixed and connected by screws to realize the fixation of the guide screw 32. The adjusting nut 33 can be freely rotated up and down along the thread of the screw body of the guide screw 32, one end of the telescopic guide rod 34 is fixedly connected to the center of the adjusting nut 33, and when the adjusting nut 33 is rotated to an appropriate position, it can be tightened by the tightening nuts 331 installed on both the upper and lower sides thereof. The other end of the telescopic guide rod 34 is hingedly connected to the rigid sleeve 36, and the rigid sleeve 36 is coaxially fitted with the flexible corrugated pipe 35, which is sealed and 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 adjusting nut 33, the angle of the rigid sleeve 36 can be adjusted, and further the angle of the flexible corrugated pipe 35 can be adjusted.

[0023] In practice, the type of joint on the workpiece 01 to be cleaned is not fixed, but is often flanged, threaded, or plain-end type. Therefore, the type of joint on 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 Figure 3(a), if the joint on the workpiece 01 to be cleaned is a flange, the second-stage left-end flange 224 can be directly selected and fixed for connection. If the joint on the workpiece 01 to be cleaned is a threaded joint, a threaded outlet flange 231 with a threaded joint on one side can be selected and fixed for connection. As shown in Figures 3(b), 3(c), and 3(d), if the joint on the workpiece 01 to be cleaned is a plain-end, a plain-end connection outlet flange 232 can be selected, which has a locking groove 2321, a positioning hole 2322, a connecting screw hole 2323, and an expansion seal ring 2324. The expansion seal ring 2324 is made of rubber and can be expanded or deflated by an expansion valve 2325. The expansion seal ring 2324 is a locking valve. The expansion seal ring 2324 is fitted into the groove 2321, and the expansion valve 2325 of the expansion seal ring 2324 extends downward from the positioning hole 2322. In order to facilitate connection with the plain end fitting type end of the workpiece 01 to be cleaned, the expansion seal ring 2324 is initially in a contracted state and cannot admit air. An appropriately sized plain end connection type outlet flange 232 is fitted into the plain end fitting 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. A small air compressor is then used to inject air into the expansion seal ring 2324 using the expansion valve 2325, causing it to expand until it is in close contact with the inner wall surface of the workpiece 01 to be cleaned, thereby realizing a fixed connection between the two.

[0024] The flanges are connected by bolts 25.

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

[0026] According to the actual working conditions on site, each part is sealed and connected to ensure that the pipelines and joints do not leak, and then according to the number of first-stage suction joint pipes 213 and second-stage suction joint pipes 223, the shut-off valve of the corresponding blow-off joint 132 of the multi-channel switching valve 13 is opened, the air compressor 12 is started, and compressed air with a certain air pressure and volume is transported to the cavities of the first-stage pipe cleaning device main body 212 and the second-stage pipe cleaning device main body 222 through the multi-channel switching valve 13, multiple high-pressure rubber tubes, multiple nozzles 133, first-stage suction joint pipe 213 and second-stage suction joint pipe 223. If the conditions at the pipe cleaning site permit, sand and stone particles with edges and corners of the required size can be directly purchased from the building material market, or large stones or construction solid waste can be crushed to the required size using a rock crusher. The vibrating sieve 11 is started, and the angular crushed sand particles are gradually added to the sieve mesh of the vibrating sieve 11. After filtering through the sieve mesh, the sand and stone particles with a size within the range of 1 to 10 mm are transported into the vibrating sieve 11, slide along the supply pipe 110 to the area near the first stage right end flange 211, and then into the cavity of the first stage pipe cleaning device body 212. The suction action of the multiple high-speed air currents entering obliquely in the cavity of the second-stage pipe cleaning device body 222 entrains the sand and gravel particles to form a first-stage gas-solid mixed flow, which is carried into the cavity of the second-stage pipe cleaning device body 222. The multiple high-speed air currents entering the cavity of the second-stage pipe cleaning device body 222 obliquely and tangentially can form an artificial tornado, causing the movement trajectory of the first-stage gas-solid mixed flow entering the cavity of the second-stage pipe cleaning device body 222 to become spiral, and moving forward to contact the inner wall surface of the workpiece to be cleaned 01, forming a second-stage gas-solid mixed flow. During this process, the sand and gravel particles continuously scratch and collide with the inner wall surface of the workpiece to be cleaned 01, adhering to the inner wall surface like multiple sharp daggers, continuously removing and peeling off the dirt accumulated on the bottom of the pipe.

[0027] As shown in Figure 1(a), when the outlet end of the workpiece 01 to be cleaned is connected to the dirt storage box 14, the removed dirt is sucked in by the artificial tornado, entrained, and mixed with the second-stage gas-solid mixed flow and carried to the dirt storage box 14. As shown in Figure 1(b), when the outlet end of the workpiece 01 to be cleaned is connected to the dirt suction vehicle 15, the removed dirt is sucked in by the artificial tornado, entrained, and mixed with the second-stage gas-solid mixed flow and carried to the dirt suction vehicle 15 by the suction action of the dirt suction vehicle 15. As shown in Figure 1(c), when the outlet end of the workpiece 01 to be cleaned is connected to both the first-stage pipe cleaning device 21 and the second-stage pipe cleaning device 22, the removed dirt is sucked in by the double artificial tornado, entrained, and carried 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 in the first stage pipe cleaning device 21 and the second stage pipe cleaning device 22 cannot achieve the expected pipe cleaning effect, the air pressure and the air volume of the compressed air sent out from the air compressor can be increased, and the fixed first stage suction joint pipe 213 and the second stage suction joint pipe 223 can be changed to an inclination adjustable structure, and the guide screw 32, the adjustment nut 33, the telescopic guide rod 34, the flexible corrugated pipe 35 and the rigid slide can be changed. By rationally adjusting the position of the reef 36, the incidence state of the multiple high-speed airflows that pass through the first-stage suction joint pipe 213 and the second-stage suction joint pipe 223 into the cavities of the first-stage pipe cleaning device body 212 and the second-stage pipe cleaning device body 222 can be adjusted, and the movement state 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 212 and the second-stage pipe cleaning device body 222 can be adjusted, thereby achieving the expected pipe cleaning effect.

[0029] After the pipe cleaning work is completed, a CCTV pipe detection robot (pipe closed circuit television detection system) can be inserted into the workpiece 01 to be cleaned to check the condition of the inner wall surface of the workpiece 01 to be cleaned after it has been cleaned by this invention. After it is confirmed that the cleaning effect has reached the specified requirements, each part can be removed and the on-site environment can be restored.

Claims

1. An artificial tornado dagger composite grooveless multi-stage pipe cleaning device, including a tip pipe cleaning device, the pipe cleaning device including 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 this order, 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), and the axes of the first-stage suction joint pipes (213) and the axis of the cavity of the first-stage pipe cleaning device main body (212) intersect obliquely 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 this order, 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), and the axes of the second-stage suction joint pipes (223) and the wall surface of the cavity of the second-stage pipe cleaning device main body (222) are in contact with each other at an inclination, The second stage right end flange (221) is connected to the first stage left end flange (214), thereby sealingly connecting the first stage pipe cleaning device (21) and the second stage pipe cleaning device (22); The first stage suction joint pipe (213) and the second stage suction joint pipe (223) are each sealed and connected to a blow-out 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 body (131), the suction joint (130) is connected to an air compressor (12), each blow-out joint (132) is connected to a nozzle (133) having an internal flow path with a contracting cross section, and the blow-out joint (132) is provided with a shut-off valve capable of opening and closing the compressed air flow and adjusting the magnitude of the flow rate, The first stage right end flange (211) of the first stage pipe cleaning device (21) is fixedly connected to the inlet flange (111) of the supply pipe (110), and the supply pipe (110) is connected to the outlet of the vibrating screen (11).

2. The artificial tornado dagger combined grooveless multi-stage pipe cleaning device according to claim 1, further comprising a rear end dirt discharge device, wherein the front end pipe cleaning device is attached to one end of the workpiece (01) to be cleaned, and the other end of the workpiece (01) to be cleaned is connected to the rear end dirt discharge device.

3. The artificial tornado dagger combined grooveless multi-stage pipe cleaning device 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 coupling pipe includes a rigid sleeve (36) and further includes a connecting rod type angle change mechanism, the connecting rod type angle change 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 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 provided with guide grooves (311), and the bottom end of the guide screw (32) is provided with the guide grooves (311). a slider fitted in the guide groove (311), the guide screw (32) being able to slide freely in an S-shape along the guide groove (311), a plurality of position-regulating holes (312) being provided at intervals on the upper surface of the guide groove (311), a position-regulating base (321) having screw holes on both sides being provided below 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 fixed and connected via screws to fix the guide screw (32); The screw body thread of the guide screw (32) is threaded with an adjustment nut (33), The adjusting 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 adjusting nut (33). The artificial tornado dagger combined grooveless multi-stage pipe cleaning device according to claim 3, characterized in that the other end of the telescopic guide rod (34) is hingedly connected to a rigid sleeve (36), the rigid sleeve (36) is coaxially fitted and connected to a flexible corrugated pipe (35), and the flexible corrugated pipe (35) is sealed and connected to the cavities of the first stage pipe cleaning device body (212) and the second stage pipe cleaning device body (222).

5. An artificial tornado dagger combined grooveless multi-stage pipe cleaning method, comprising using the artificial tornado dagger combined grooveless multi-stage pipe cleaning device according to any one of claims 1 to 4, Attaching the pipe cleaning device at the front end to one end of the workpiece (01) to be cleaned, and connecting the other end of the workpiece (01) to the dirt discharge device at the rear end; According to the number of first-stage suction joint pipes (213) and second-stage suction joint pipes (223), opening the shutoff valves of the corresponding blow-off joints (132) of the multi-channel switching valves (13), starting the air compressor (12), and transporting compressed air at a certain pressure and volume to the cavities of the first-stage pipe cleaning device main body (212) and second-stage pipe cleaning device main body (222) via the multi-channel switching valves (13), nozzles (133), first-stage suction joint pipes (213), and second-stage suction joint pipes (223); The vibrating sieve (11) is started, and angular crushed sand particles are placed in the sieve mesh of the vibrating sieve (11). The sand particles filtered by the sieve mesh are carried inside the vibrating sieve (11), slide along the supply pipe (110) to an area close to the first-stage right-end flange (211), and are sucked in by the suction action of multiple high-speed air currents obliquely incident on the cavity of the first-stage pipe cleaning device body (212), forming a first-stage gas-solid mixed flow, which is carried to the cavity of the second-stage pipe cleaning device body (222), and then flows into the cavity of the second-stage pipe cleaning device body (222). - The multiple high-speed airflows entering the cavity obliquely and tangentially can form an artificial tornado, making the first-stage gas-solid mixed flow entering the cavity of the second-stage pipe cleaning device body (222) move in a spiral trajectory, and move forward to contact the inner wall surface of the workpiece (01) to be cleaned, forming a second-stage gas-solid mixed flow, during which the sand and gravel particles continuously scratch and collide with the inner wall surface of the workpiece (01) to be cleaned, and adhere to the inner wall surface like multiple sharp daggers, continuously removing and peeling off the dirt accumulated on the bottom of the pipe; If it is found during the pipe cleaning process 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, the method may devise ways to increase the wind pressure and the wind volume of the compressed air sent out from the air compressor, adjust the inclination angles of the first-stage suction joint pipe (213) and the second-stage suction joint pipe (223), and further adjust 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), thereby achieving the expected pipe cleaning effect. and discharging the removed dirt into a dirt discharge device.

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